Clarification Draft Responses Note for KPTSIP Lot3Aand3B

7/31/2019 Clarification Draft Responses Note for KPTSIP Lot3Aand3B

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KENYA ELECTRICITY TRANSMISSION CO. LTD.

2nd Floor Capitol Hill Square Chyulu Rd Upper HillP. O. Box 34942 00100, NAIROBI

Phone: +254 20 4956000Cell: +254 719018000Cell: +254 732128000

Our Ref: KETRACO/TECH/KPTSIP/JMM/03 04th June, 2012

To All Bidders

Kenya Power Transmission System Improvement Project (KPTSIP); Project No. P-KE-FAO-004 (Lot 3A, 3B).

Dear,All

RE: LOT 3A & 3B CLARFICATION LIST NO. 1

Fi d tt h d t l t 3A d l t 3B i d l ifi ti i d f th


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KENYA POWER SYSTEM IMPROVEMENT PROJECT- LOT 3A & 3B CONTRACT P-KE-FA0-004

Clarification list 1

No. Clarification/Query Response

1 The Completion time In PC GC 2.2.2 is indicated as 22 months while in

T.S. 1.8.4 it is indicated 24 months. Kindly confirm which is applicable.

Completion time shall be 22 months

2 In the price schedules SCHED1 Lot A item BMT606, KBT606, NRK 606 and NYH606

SCHED1 Lot B item KIE606, KIT606, SHD606 and WTE606. Each one of these itemindicates n. 12 / 33 kV voltage transformers that do not appear on the SLD; kindly

confirm the requirement of them

Each feeder needs the stated number of V.Ts as per the price

schedule.

3 The 132 kV current transformers showed on the SLD of Olkaria substation are not

mentioned in the price

schedules; kindly confirm which document prevail

As indicated on the SLD,3 sets of CTs will be required i.e 2 sets for

the bus coupler and 1 set for the line.Bidders to revise the price

schedules accordingly.

4 The n.2 / 132 kV CBs and the n. 12 / 132 kV CTs showed on the SLD of Sultan

Hamud for bus section and bus coupler are not mentioned in the price schedules;

kindly confirm which document prevails.

The SLD is confirmatory i.e 2 pieces 132 kV CBs and 4 sets 132

kV CTs.Bidders to revise the price schedules accordingly.

5 Is there any preliminary data for soil investigation andare there any topographical

drawings

No.To be done by contractor upon contract award.

6 The 132 kV OLKARIA drawing GA No. 5083020OLK002 is missing; kindly provide

it

The 132 kV LESSOS drawing GA No. 5083020LES002 is missing; kindly provide it

Bidders were required to take enough details during the pre-bid

site visits since the drawings are not available yet.

7 The Technical specification (3.1.1), data sheets, and drawings show differences in

the documents, we

assume that vector group is Dyn11; kindly confirm

For Bomet,Kabarnet,Narok use Dyn11. For

Kieni,Nyahururu,Kitui,Wote and Sultan Hamud use Dyn1


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8 The Technical specification (4.4) has not mentioned a specific type of 132 kV

disconnector, kindly confirm if both centrebreak and /or doublebreak type can

be proposed.

Centre break disconnectors shall be proposed.

9 For Technical specification (4.5) kindly inform if SF6 insulated current

transformers are accepted.

Oil insulated shall be accepted.

10 In Technical specification (5.3 and 5.4) kindly inform if outdoor resin insulated

type 33 kV CTs and VTs are accepted

Oil insulated shall be accepted.

11 In Technical specification (10.1.2) Kindly inform if the documentations of the

existing control and protection systems ( drawing, types, brands) for the

following substations: LOT 3A : Lessos, Nanyuki and Olkaria, LOT 3B : Mwingi are

available.

Bidders were required to gather as much iniformation as possible

during the pre-bid visits for bidding purposes.Detailed drawings

will be provided to the winning bidder.

12 The technical specifications item 2.2 requires a creepage distance of 25 mm/kV

(inland ) and 31 mm/kV (transformers) ,while the data sheets indicate a creepage

distance of 31 mm/kV; kindly confirm which requirement prevails.

Technical specification item 2.2 prevails.

13In section II. Bid data sheet page 35, the time schedule is for 22 months while it is

mentioned 24 months in section III. Evaluation and qualification criteria page 40

Refer to item 1.

14 In section VIII: Particular conditions GC 5.1.2, the liquidated damage is 0.5% of

the contract price per week and max 10% of the contract price. However, in

section III: Evaluation and qualification criteria page 40 item 1.7 (a), it is

mentioned the adjustment rate in the event of completion period beyond the

minimum period shall be 0.2% for each week of delay from that minimum

period. Please confirm if these 2 statements mean the same and why this

difference in the percentage, otherwise clarify what is the meaning of minimum

period in this paragraph 1.7 (a).

Section III, item 1.7 applies only during evaluation while Section

VIII GC 5.1.2 shall apply during the contract period.The '

minimum period ' refers to the least completion time given by

the bidders.

15 Although it was not mentioned in the payment terms, it is clear in section IX.

Contract forms: Article 3 Effective date that the payment is by Letter of credit.

However, but it is not clear whether the down payment is within the LC or not.

Please clarify.

Payment shall be direct payment from the bank.LC shall not be

applied.


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16 Kindly confirm that all 132KV towers and OPGW cables with related accessories

that must be installed in all 132/33KV substations under Lot 3a and3b, mentioned

in the technical specifications section 1.2 scope of work, are not in our scope of

supply, and must be provided by others under Lots 1 and 2.

Refer to bid document and Technical Specification for the scope

of works.

17 Kindly confirm the short circuit withstand time for the 132KV and 33KV system,

since in the guarantee schedules it is 1sec and in the technical specifications,section 2.2 system design parameters it is 3sec.

The short circuit withstand time shall be 3sec.

c. In the technical specifications section 2.2 system design parameters, the

minimum creepage distance is 25mm/KV for inland and 31mm/KV for

transformers. While in the guarantee schedules, the creepage distance of

equipments including transformers is 31mm/KV. So kindly confirm which value

should be considered 31 or 25mm/KV.

Refer to item No. 12

18 Concerning the suspension insulators, kindly note that in the technical

specifications, section 4.8.3.2 deadend and suspension type insulators,

porcelain insulators are needed. Although in the technical schedule, table 19

132KV deadend and suspension insulatorsdiscs, porcelain, glass disc or

composite polymer can be supplied. So kindly confirm whether glass or polymerdisc can be used for suspension insulators.

Only Polymer insulators shall be used.

19 In the technical specifications section 4.8.3.2 dead end and suspension type

insulators and 4.8.3.4 string insulators, the creepage distance is 25mm/KV.

Kindly confirm if this value is correct or should it be 31mm/KV..

Refer to item No. 12

20 For the 110Vdc supply system, kindly confirm the number of 110Vdc battery and

the number of 110Vdc battery charger. Same for the 48Vdc system. Since the

price schedule the quantities are lump sum, and in the technical specifications

section 9.3 110VDC, quantities are not mentioned.

Its the bidders responsibility to design an optimal system that

meets the technical specifications.Refer to technical data

sheet.Five(5) spare cells for each system shall be required.

21 In the technical specifications, section 9.3.5.1 Battery chargergeneral, the float

voltage is 2.25V/cell; while in the guarantee schedule Table 24 item float

charging voltage, it is 2.23V/cell. Kindly confirm the correct value of float

voltage..

The float voltage is 2.25V/cell


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22 Kindly confirm the vector group of the 132/33KV power transformer, since in the

SLD it is Dyn11, in the guarantee schedule Table1 item Vector group it is Dyn1,

and in the technical specifications section 3.1.1 Power transformergeneral it is

DNyd11.

Refer to item No. 7

i. Kindly advise if there is an evaluation/capitalization on the transformers in

order to compare the different offers of suppliers. In case there is, kindly give usthe capitalization formula.

Refer to Section III, Evaluation and Qualification Criteria

j. Is there maximum guaranteed value for transformers losses, above which the

liquidated damages becomes applicable?

Refer to Section III, Evaluation and Qualification Criteria

k. Kindly confirm whether the value of no-load and load losses mentioned in the

guarantee schedule of the power transformer, should be a fixed maximum value

taken into consideration the IEC tolerance, or should it the value without IEC

tolerance?

refer to provision in the relevant IEC standard

l. In the technical specification of the power transformers section 3.15.2 losses,

the liquidated damage of load losses is $3,520 per KW, while in the evaluation

and qualification criteria section III, subsection 1.7(c) functional guarantees ofthe facilities, it is $3,050 per KW. Kindly confirm the exact value.

the liquidated damage of load losses is $3,520 per KW

23 Concerning the 132KV CT;

In the price schedule as well as in the technical schedule, item rated secondary

currents it is mentioned three secondary cores with rated current 1A. But in the

technical schedule Table11, item number of cores, the 132KV current

transformer has 5 cores (one for measuring, one for metering, 2 for protection

and the last one for busbar). So kindly confirm the exact number of cores for all

132KV current transformers used in all substations.

5 cores shall be used.

24 Concerning the 132KV CT;In the technical specification, section 4.6 current transformers, the accuracy of

measuring core is 0.5, and there is no mention of the accuracy of metering core.

While in the guarantee schedule Table 11, the accuracy of metering core is 0.2.

Kindly confirm and clarify the accuracies of metering and measuring cores.

Refer to the technical data sheets , table 11


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In the technical specification, section 4.6 current transformers, the accuracy of

protection core is 5P10, while in the guarantee schedule Table 11, it is 5P20.

Kindly confirm the correct value of the protection cores accuracy.

5P20 (i.e accuracy upto to 20 times the CT rating) Refer to the

technical data sheets , table 11

26 Kindly note that, according to the guarantee schedule Table 10, item rated

secondary voltage, the 132KV voltage transformer has two secondary, while initem accuracy class it is mentioned 3 cores (one for metering, one for

measuring and the last for protection). So kindly confirm the exact number of

secondaries.


meets the technical specifications.(Two secondary cores can besufficient one for protection(5P) and one metering (0.2). Refer to

the technical data sheets , table 10


In the price schedule as well as in the technical schedule, item rated secondary

currents, it is mentioned three secondary cores with rated current 1A. But in the

technical schedule Table 17, item number of cores, the 33KV current

transformer has 4 cores (one for measuring, one for metering and 2 for

protection). So kindly confirm the exact number of cores for all 33KV current

transformers used in all substations.

Refer to Table 17 of Technical Data Sheet. Four(4) cores.

28 Concerning the 33KV CT

In the technical specification, section 5.3 33KV current transformers, the

accuracy of measuring core is 1, and there is no mention of the accuracy of

metering core. While in the guarantee schedule Table 17, the accuracy of

metering core is 0.2. Kindly confirm and clarify the accuracies of metering and

measuring cores.

Refer to Table 17 of Technical Data Sheet


Kindly confirm that the 33KV current transformer installed on the 33KV outgoing

feeders has 3 cores with ratings 400-200-100/1/1/1A, as per price schedule and

guarantee schedule Table 17, instead of 2 cores as per SLD.



In the technical specification, section 5.3 33KV current transformers, the

accuracy of protection core is 5P10, while in the guarantee schedule Table 17, it is

5P20. Kindly confirm the correct value of the protection cores accuracy.



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31 Kindly note that, according to the guarantee schedule Table 13, item rated

secondary voltage, the 33KV voltage transformer has two secondary, while in

item accuracy class it is mentioned 3 cores (one for metering, one for

measuring and the last for protection). So kindly confirm the exact number of

secondaries


32 In the price schedule of Ishiara and existing Sotik SS, it is mentioned a 100KVA,

415/240V diesel generator (with automatic change-over facility). So kindly send

technical specification about the diesel genset since there is no mention of it in

section VI- technical specifications. In addition, kindly clarify the capacity needed

of the storage or daily tank.

An addendum will be issued later in the week.

33 In the scope of work section 1.3.5, kindly confirm that the 11/0.415KV auxiliary

transformer to be feed from an existing nearby 11KV capacity line instead of

33KV line. In addition, kindly send technical schedule for the 11/0.415KV auxiliary

transformer.

An addendum will be issued later in the week.

34 a. Concerning the 132KV underground cable that must be installed in OLKARIA I

SS, mentioned in the technical specs section 1.2 scope of work and in the price

schedule under section 4OLK100 132KV transmission line feeder bay:

i. Kindly confirm if it is in our scope of supply, or if it will be provided by othersunder lots 1 and 2.

ii. In case it is in our scope, kindly clarify where it should be installed. Is it

between two terminations, one installed inside the substation and the other next

to the 132KV tower? Or is it installed in a remote area?

iii. Does the 1Km lengths refer to the total length of cables, or the length per

phase?

iv. What is the section of the 132KV underground cable needed and how many

cables per phase must be supplied?

This is in Lot3B,the cable may be required to be installed

between the line bay and the terminal tower.1km is the total

length for all the phases.2 cables per phase is anticipated.Its the

bidders responsibility to design an optimal system that meets thetechnical specifications.Refer to the technical data sheets , table

28

35 In the appendix drawing of bidding document, it is referred that for duration offault, 220kV system is 1s, 66kV system is 3s. But in the text, it is said that

duration of 66kV system fault is 1s. Please clarify the duration of fault in the

substation.

Refer to item 17


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36 Kindly confirm the power rating of the 132/33KV transformer in Wote SS, since in

the SLD it is 15MVA and in the general arrangement, technical specification

section 1.3.3 and price schedule, section 4WTE-101 it is 23MVA.

23MVA

37 Kindly confirm the power rating of the 132/33KV transformer in Sultan Hamud SS,

since in the SLD and general arrangement it is 15MVA and in the technical

specification section 1.3.4 and price schedule section 4SHD-101 it is 23MVA

23MVA

38 Kindly confirm that there is no 132KV, 1600A circuit breaker, and that the

guarantee schedule of the 132KV circuit breaker Table 5, item rated current

must include rated current 2000A for outgoing feeder and 800A for transformer

feeder, as per price schedule.

Rated current of 1200A for 132kV CB for line feeder and at least

800A for 132kV CB for Transformer breaker

39 Kindly confirm that the guarantee schedule of the 132KV isolator without earthing

switch Table 29 must include rated current 1600A for line feeder and 800A for

transformer feeder.

All issolators must be rated at least 1200A

c. Kindly confirm the minimum creepage distance of the 33KV circuit breaker

since, as per the guarantee schedule Table 8, it is 25mm/KV which is different

than the creepage distance of other equipments (31mm/KV).

31kV/mm

40 Kindly confirm that the guarantee schedule of the 33KV isolator with earthing

switch table 9 is not applicable, as per SLD and price schedule.

33kV Isolator with earthswitch shall be required for every

outgoing 33kV feeder

e. Kindly confirm that, in the guarantee schedule of the 132/33KV, 23MVA power

transformer table 1, item Type of cooling must be ONAN/ONAF instead of

ONAN as per the technical specification section 3.6.1 Cooling equipment

general, with 23MVA rated power at ONAN.

Type of cooling for 132/33kV 23MVA Transformers is

ONAN/ONAF


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41 a. In exist ing OLKARIA SS:

i. The 132KV current transformer installed on the line feeder has four cores as per

SLD and three cores with ratings 800-400-200/1A as per price schedule item 4OLK-

104. While in the guarantee schedule, the number of cores is different (kindly

refer to question B.j-technical general 132KV current transformer).So kindly

confirm the correct number of cores.

ii. An item for the 132KV current transformer must be included in the price

schedule under section 4OLK200 132KV new reserve busbar system, qty=1. So

kindly confirm ratings and specifications of this CT.

Refer to Table11 in the technical schedules for no. of cores

required and specifications. Also refer to Item 23 above.

42 b. In SOTIK Tee-off SS:

i. Kindly confirm that, as per SLD, an item for the 132KV capacitive voltage

transformer, qty=3pcs must be included under section STK200 busbar system.

ii. Kindly confirm that the items under sections STK-600 and STK-700 must have

quantities of 1 lump sum instead of 3.

Qty=3pcs.However,note that it is bidder's responsibility to design

an optimal system adequately meeting the functionional

requirements in line with the techinical specification and any

issued addenda.Quantities given in the refered price schedule to

be used.

43 a. Kindly confirm that, as per schedule 1 under section 1101, an item for service

and analysis system station must be included in schedule 4 under section 1101

for Narok, Bomet, Kabarnet and Nyahuru SS.

Include

N/B Its the bidders responsibility to design an optimal system

that meets the technical specifications.

QUOTE FOR 2 Transformers

INCLUDE

INCLUDE

45 c. In Bomet SS:

i. Kindly confirm that item 4BMT501 must be motorized disconnectors 33KV,800A, as per schedule 1 item BMT501.

ii. Kindly confirm that item 4BMT602 must be motorized disconnectors 33KV,

800A without earth switch, as per schedule 1 item BMT602 and BMT603.

Refer to SLD

b. In Narok SS:

i. Kindly confirm that the quantity of the items must be equal to the quantity of

the same items mentioned in schedule 1. For ex., the quantity of item 4NRK-102

auxiliary transformer must be 1 instead of 2 as per schedule item NRK102.

ii. Kindly confirm that an item for the 132KV voltage transformer, qty=3pcs must

be included under section 4NRK-400 as per schedule 1 item NRK=401.INCLUDE

44


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46 d. In Kabarnet SS, kindly confirm that the quantity of item 4KBT-304 must be 2

instead of 1, and the quantity of item 4KBT-305 must be 0 instead of 1 as per

schedule 1 item KBT-304.

Refer to SLD

47 e. In Nyahuhura SS:

i. Kindly confirm that the quantity of item 4NYH-202 must be is 3pcs instead of 6,

as per schedule 1 item NYH-202.

ii. Kindly confirm that the quantity of item 4NYH-305 must be is 0set instead of 1,

as per schedule 1 item NYH-304.

iii. Kindly confirm that item 4NYH501 must be motorized disconnectors 33KV,

800A, as per schedule 1 item NYH501.

iv. Kindly confirm that item 4NYH602 must be motorized disconnectors 33KV,

800A without earth switch, as per schedule 1 item NYH602 and NYH603

v. Kindly confirm that items 4NYH-704 to 4NYH-706 must be removed since they

are mentioned in items 4NYH-811 and 4NYH-812.


meets the technical specifications.REFER TO SLD

48 f. In existing SOTIK Tee-off SS, Kindly confirm that the items under sections 4STK-

300, 4STK-400 and STK-500 must have quantities equal to 3 lump sum instead of1,as per schedule 1.

CONFIRMED, Sotik S/S is however new and not existing.

49 g. In existing Lessos SS, kindly confirm that, as per schedule 1 item LES-207, an

item for Steel Lattice busbar gantries must be included under section 4LES200.

CONFIRMED

50 h. In existing Nanyuki SS, kindly confirm that, as per schedule 1 item NYK-207, an

item for Steel Lattice busbar gantries must be included under section 4NYK200.

CONFIRMED

51 a. In Ishiara SS:

i. Kindly confirm that, as per SLD, an item for the 132KV capacitive voltage

transformer must be included under section 1ISH200 busbar system, and

kindly confirm the quantity.

ii. Kindly confirm that the quantity of items under section 1ISH-600 is 1 lump sum

instead of 3.

iii. Kindly confirm that the quantity of items 1ISH-703 to 1ISH-706 is 1 lump sum

instead of 3.

i) Confirmed;ii)Three(3);iii)Three(3) However, its the bidders

responsibility to design an optimal system that meets the

technical specifications.


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52 b. In Mwingi SS, Kindly clarify if the 132KV capacitive voltage transformer installed

on the busbar is existed or it must be supplied? If it will be supplied, kindly

confirm that it must be included under section 1MWG200 busbar system, and

kindly confirm the quantity.

To be included,quantity is One(1)

53 c. In Sultan Hamud SS, Kindly confirm that, as per SLD, an item for the 132KV

current transformer (installed in the bus coupler and bus section)and another for

the 132KV circuit breaker(installed in the bus coupler and bus section) must be

included under section 1SHD400 132KV busbar system, and kindly confirm the

quantities.

REFER TO SLD.However its the bidders responsibility to design an

optimal system that meets the technical specifications.

54 d. In Wote SS:

i. Kindly confirm that the quantity of item WTE505 33KV neutral link must be

1set, as per SLD, instead of 2.

ii. Kindly confirm that, as per SLD, an item for the 33KV surge arrestors must be

included under section WTE800 33KV busbar system, qty=3pcs.



55 e. In Kitui SS, Kindly confirm that, as per SLD, an item for the 33KV surge arrestors

must be included under section KIT800 33KV busbar system, qty=3pcs.

Confirmed.However,its the bidders responsibility to design an


56 schedule 4 Installation and other services:

Kindly confirm that the quantity of item 1810 foundation for single phase 33KV

voltage transformer must be 18 lots instead of 15 in Kitui, Sultan Hamoud, Kieni

and Wote SS.



57 schedule 4 Installation and other services:

Kindly confirm that, as per schedule 1 under section 1101, an item for serviceand analysis system station must be included in schedule 4 under section 1101

for Kieni, Kitui, Wote and Sultan Hamud SS.

CONFIRMED


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58 c. In Kieni SS:

i. Kindly confirm that the quantity of item 4KIE304, motorized switching

disconnector 132KV, 800A, without earthing switch must be 2sets instead of 1 as

per schedule 1, item KIE-304.

ii. Kindly confirm that the quantity of item 4KIE305, motorized switching

disconnector 132KV, 800A, with earthing switch must be 0sets instead of 1 as

per schedule 1, item KIE-304.



59 d. In Kitui SS:

i. Kindly confirm that item 4KIT501, must be motorized disconnectors 33KV,

800A.

ii. Kindly confirm that item 4KIT602, must be motorized disconnectors 33KV,

800A without earth switched with quantity 8sets instead of 4 as per schedule 1

item KIT-602 and KIT-603.

iii. Kindly confirm that the quantity of item 4KIT605, 33KV voltage transformer

must be 12pcs instead of 15, as per schedule 1 item KIT-606.

iv. Kindly confirm that, as per SLD, an item for the 33KV surge arrestors must be

included under section 4KIT800 33KV busbar system, qty=3pcs.v. Kindly confirm that the quantity of items 4KIT-1201 to 4KIT-1203 must be 2pcs

instead of 1.



60 e. In Wote SS:

i. Kindly confirm that item 4WTE602, must be motorized disconnectors 33KV,

800A without earth switched with quantity 8sets instead of 4 as per schedule 1

item WTE-602 and WTE-603.REFER TO SLD

ii. Kindly confirm that the quantity of item 4WTE605, 33KV voltage transformer

must be 12pcs instead of 15, as per schedule 1 item WTE-606.REFER TO SLDiii. Kindly confirm that, as per SLD, an item for the 33KV surge arrestors must be

included under section 4WTE800 33KV busbar system, qty=3pcs.


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61 f . In Sultan Hamud SS:

i. Kindly confirm that the quantity of item 4SHD304 motorized switching

disconnectors 132KV, 800A, without earthing switch must be 3 sets instead of 2

as per SLD and schedule 1 item SHD-304.

ii. Kindly confirm that the quantity of item 4SHD501 must be motorized

switching disconnectors 132KV, 800A as per schedule 1 item SHD501.

iii. Kindly confirm that the quantity of item 4SHD602 must be motorized

switching disconnectors 132KV, 800A without earth switch, qty=8sets as per

schedule 1 item SHD-602 and SHD-603.

iv. Kindly confirm that the quantity of items 4SHD-1201 to 4SHD-1203 must be

3pcs instead of 1.

v. Kindly confirm that the quantity of item 4SHD-1806 must be 12 lots instead of 4



62 g. In Ishiara SS:

i. Kindly confirm that the quantity of item 4ISH-108 and 4ISH-109 must be, as per

schedule 1 items ISH-108 and ISH-109, qty=3 lump sum instead of 1.ii. Kindly confirm that under section 4ISH200 busbar system, an item must be

included for Steel lattice busbar gantries, qty=3 lump sum, as per schedule 1

item ISH-207.

iii. Kindly confirm that the quantity of all items under section 4ISH-300 and 4ISH-

400 must be, as per schedule 1 section ISH-300 and ISH-400, qty=3pcs instead of

1.

iv. Kindly confirm that the quantity of item 4ISH-501 to 4ISH-503 must be, as per

schedule 1 items ISH-501 and ISH-503, qty=3pcs instead of 1.

v. Kindly confirm that the quantity of item 4ISH-505 must be, as per schedule 1

items ISH-505, qty=3 lump sum instead of 1.

vi. Kindly confirm that the quantity of item 4ISH-803 must be 6 lots instead of 3.vii. Kindly confirm that the quantity of item 4ISH-806 must be 9 lots instead of 6.

TO REMAIN 3 TO CATER FOR TH FOR THE THREE LINE BAYS FOR

ITEM I, REFER TO SLD for ii-vii


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63 h. In Mwingi SS:

i. Kindly confirm that under section 4MWG200 busbar system, an item must

be included for Steel lattice busbar gantries, qty=3 lump sum, as per schedule 1

item MWG-207.

ii. Kindly confirm that the quantity of item 4MWG-805 must be 6 lots instead of 3.

REFER TO SLD

64 In the price schedules SCHED1 Lot 3A Sotik and Schedule no.1 of Lot 3B ISHIARA

under low voltsge auxillary power supply system, an item namely'415/240V from

the nearest distribution network (100kVA) ' has been mentioned with 1no.

lumpsum quantity ,but the the total price of theis particular item is not added to

the sub total of schedule 1 .Please clrify whether this item has to be considered.

All to be included in the Bid.

65 In the price schedules SCHED1 Lot 3A Sotik and Schedule no.1 of Lot 3B ISHIARA

under low voltsge auxillary power supply system, an item namely'100kVA

,415/240V diesel generator (with automatic change over ' has been mentioned

with 1no. lumpsum quantity ,but the the total price of theis particular item is not

added to the sub total of schedule 1 .Please clrify whether this item has to beconsidered.

All to be included in the Bid.

66 In the price schedules No.1 Lot 3B KITUI and Schedule No.1 of Lot 3B WOTE

'under the Busbar system, the quantity of 33kV surge arrestor is not mentioned

.Please provide the quantity of the 33kV surge arrestor required for KITUI and

WOTE substations.


meets the technical specifications and the protection levels

demanded by the indicated standards.

67 In the price schedules No.1 Lot 3B SULTAN HAMUD 'under the Transformer bay ,

the quantity of Motorised switchind disconnector 132kV,800A,without

earthswitch is mentioned as 3No.,but for for other substations with similar design

and layout the quantity is 2no.Please provide the quantity of the Motorised

switching disconnector 132kV,800A,without earthswitchrequired for SULTAN

HAMUD.

Provide an adequate number for each substation; Its the bidders


technical specifications and the protection levels demanded by

the indicated standards.

68 In the price schedules No.1 Lot 3A SOTIK 'under the Transformer bay , the

quantity of Motorised switchind disconnector 132kV,1600A,without earthswitch

is mentioned as 2No.,but for for other substations with similar design and layout

the quantity is 0no.Please provide the reason and exact quantity of the

Motorised switching disconnector 132kV,1600A,without earthswitch required for

SOTIK substation

Provide an adequate number for each substation; Its the bidders





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69 In the price schedules No.1 Lot 3B SULTAN HAMUD 'under the 132kV busbar

system, the quantity of Voltage transformer is mentioned as 6No.,but for for

other substations with similar design and layout the quantity is 3no.Please

provide the quantity of the Voltage transformer required for SULTAN HAMUD

substation.

3 sets of Single phase units, however Bidder must provide an

adequate number for each substation; Its the bidders




70 Please specify the minimun transformer NO load loss for the 23MVA 132/33kV

power transformers

The bidder shall state the losses of the power transformer they

supply, the tolerances of which shall however be in accordance

with IEC 60076 or equivalent BS standard.

71 Please specify the minimun transformer load loss for the 23MVA 132/33kV power

transformers

The bidder shall state the losses of the power transformer they

supply, the tolerances of which shall however be in accordance

with IEC 60076 or equivalent BS standard.

72 Please specify the basis on which the type of condition of the 23MVA,132/33kV

power transformer the losses will be accessed and compared,is it ONAN rating or

ONAF rating and what are their minimun values

The Losses shall be measured under ONAN conditions at

standard environmental and operational conditions

73 In the technical specifications,under Volume 2, of the tender document,it ismentioned that the 132kV SF6 circuit breaker of three pole ooutdoor.But in the

price schedule of Lot 3a and Lot 3b,all the bay extensions in existing substations it

is mentioned 132kV SF6 circuit breaker of single pole outdoor.Please clarify about

the type of SF6 circuit breaker to be used for the new substations and bay

extensions in the existing substations.

The 132kV SF6 circuit Line feeder breakers shall be single poleoutdoor while the 132kV SF6 circuit Transformer breakers shall

be Three pole outdoor.

74 Please clarify whether the 132kV Voltage transformer to be used in all substations

should be purely aVoltage transformer or a Capacitor voltage divider CVT type

with electromagnetic units

Refer to item 4.3 in the Technical Specifications.

75 In the technical specifications,under Volume 2, of the tender document,for the

main busbar,busbar connections and for other bubar plants,Aluminum reinforcedACSR conductors of 435/5sqmm shall be used.Please clarify on the size of the

conductor to be used.

Its the bidders responsibility to design an optimal Busbar that

meets the technical specifications in terms of the Normaloperational curent level and system Fault leves.


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76 In the technical specifications,under Volume 2, of the tender document it is

mentioned that the post insulators and string insulators of porcelain are to be

used.Clarify whether polymer or glass type can also be used.

Post insulator shall be porcelain,refer to Technical specifications

4.8.3.2 and 4.8.3.3. For string insulators polymeric insulators shall

be used in accordance to the relevant IEC standards.

77 In the technical specifications,under Volume 2, of the tender document it is

mentioned that the 33kV surge arrestor of porcelain are to be used.Please clarify

whether polymer type can also be used.

Polymeric insulators shall be used in accordance to the relevant

IEC standards.

78 Please specify the type and size of lightning protection material like rod,mast and

conductor which are to be used

Refer to item 6.7 in the Technical Specifications.

79 In the technical specifications,under Volume 2, of the tender document, a

document namely 'Guide for Safety in Substations Grounding ' ANSI/IEEE No. 80-

2000 ' is mentioned under substation earthing .Please provide the complete

document for us to folow the guidelines for substation earthing works.

This is an International Standard/Guideline, the Bidders shall

source for themselves.

80 In the technical specifications,under Volume 2, of the tender document, a

document namely 'National Fire Protection Association NFPA codes ' is

mentioned under Fire detection and Protection .Please provide the complete

document for us to folow the guidelines for substation earthing works.

Bidders shall source Standards and Guidelines the for

themselves.

81 The KETRACO specification clause no. 3.1.1 (volume 2 of 2 page no.26) calls for

vector group for all power transformers shall be DNyd11.But as per the technical

data sheet it is mentioned as Dyn1 and in SLD it si mentioned as DYn11.Please

clarify and provide the exact vector group of the transformer.

Refer to Item No. 7

82 The KETRACO specification clause no. 3.6.1 (volume 2 of 2 page no.35) cooling of

transformer ,specification calls for the ONAN/ONA,whereas in GTP is mentioned

as ONAN,Kindly confirm the rating of the transformer ONAN as well as ONAF.

The cooling system for 23MVA power transformers shall be

ONAN/ONAF under continuous ratings of 18MVA for ONAN and

23MVA ONAF

83 The KETRACO specification clause no. 9.2.1 (volume 2 of 2 page no.105) cals for

use of transformer is outdoor type.But as per the technical data sheet it is

mentioned as indoor.Please clarify.

The auxillary transformer shall be OUTDOOR


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84 As per specification clause no. 2.2 SYSTEM DESIGN PARAMETERS,the isolator

curent rating is 2000A for the 132kV side whereas schedule item no.203 and 206

it is mentioned as 1600A for line side and 800A for transformer incomer

side.Kindly clarify the exact rating.

Bus section Isolators shall be 2000A while they shall be rated

1200A for 132kV line feeder and at least 800A for 132kV

Transformer Isolator.

85 There no NCT detail in specifications and price schedules.Kindly provide CT cores

and ratings


86 in the new substations Bomet,kabarnet,Nyahururu the 33kV line VT is not

mentioned in SLD whereas it is mentioned in price schedules,please clariffy

whether it is required or not

No Line VTs are required, the Busbar connected VTs shall be

used.

87 Please provide the Battery capacity Ampere Hour for 48V DC Contractor to provide an optimal capacity to meet the substation

needs plus 30% spare capacity.

88 Scope calls for measurement of soil resistivity and soil properties for design

purpose.Kindly note that the above works are possible after award of contract

and we shall provide our bid,the charges for carryingout the same.However for

estimation purposes we would require you to furnish indicative soil resistivity and

soil properties for all the substations,since it is not possible t measure these

details before the submision of the bid.Further the above data will help bidders

to desgn the earthing system and civil foundations and submit their offers on acommon basis.

Ground Resistivity has not been measured. However, for bidding

purposses, assume Farming loamy and sandy-clay soils with an

earth resitivity value of 150 m. However, the final design shall

use the actual measured values.

89 Vol-2 subclause 2.4.4.,Vehicles,Specifications calls for supply of 5 new motorbikes

o 100cc to be used by wayleave officers.We presume the the supply of motor

bikes has to be used for transmission line and not for substation.Please confirm

Remove the cost of supply of 5 new motorbikes.They shall not be

required in Lot 3.

90 Vol-2 subclause 2.4.5.,Comunication,Specifications calls for supply of 5 mobile

telephones sets and one (1) I-pad.Please provide the detailed specifications for

mobile telephones and I-pad.

Details shall be providded to the winning biider, atleast smart

phones with adequate airtime to manage the project.Latest

technology will be required.

91 Four 132kV line bay extensions station name Olkaria,Sotik,Lessos Nanyuki,the

following site input details to be furnished;1)Existing substation electricallayout/section 2)Soil investigation report for exixting substation,existing

foundation details. 3).Soil resistivity report /existing earth mat details for existing

substations. 4)Outgoing feeder termination pole details.5)Exixting cable trench

layout and section drawing.6)Existing outdoor lighting layout and DSLP layout.

The scope of work clearly details the contractor's

responsibility.Any further details required for existing substationsshall be given to the winning bidder,therefore, bidders are

advised to gather as much as they require by visiting the sites.


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92 Four 132kV line bay extensions station name Olkaria,Sotik,Lessos Nanyuki,the

following Existing Control room details to be furnished;1) Capacity and adequacy

for additional load of LVAC and DC load .(spare feeders). 2)INterfacing SCADA

details ,(if any), provide the details of make and model. 3).Existing battery

capacity and/charger ratings. 4)Existing control room layout/construction details

Any further details required for existing substations shall be given

to the winning bidder,therefore, bidders are advised to gather as

much as they require by visiting the sites.

93 As stated under Tender Spepcification -Volume 1 - Section VII-General Conditions

of Contract - clause 3.4 our understanding is thatmfor schedule no.3 -design

services,Schedule no.4 -Installation and other services only VAT at the prevailing

rate of 16% is applicable and the same needs to be included by the bidder in their

quated price.The VAT portion will be shown differently in the Grand Summary in

Schedule 5

For bidding purposes,the quoted price shall exclude all taxes.

94 Apart from the above,Schedule NO.1 - Plant and Mandatory spare parts supplied

from abroad and Schedule No.2 - Plant and Mandatory spare parts supplied from

within the employer's country are exempted from all customs and import

duties,Local levies,sales tax and value added tax(VAT).Please confirm.

The project is tax exempt.

95Kindly advise for the above subject tenders if Letter of Credit (L.C) paymentis allowed.

Letter of Credit (L.C) payment is NOT allowed.

96 In BDS Time to complete the Plant, Installation Services and pre-commissioning

activities shall be 22 months, but in Section III Evaluation and Qualification

Criteria, the time is 24 months. Please clarify which time is correct?

Refer to Item 1

97 In BDS ITB 11.1(h)-e): Equipment similar in all specifications to those offered as

the major equipment to be supplied must have been installed and been in service

for at least five (5) years outside the country of manufacture. The bidder shall

submit documentary evidence. Which kind of documents are needed to

support the above mentioned equipments in services for at least 5 years?

Letters of appointment, letters of execusion, Client reference

letter or such other document that can be authenticated.

98 In BDS ITB 11.1 (j): In general, for items of supply, the vendors must have

successfully manufactured and supplied in any one year during the last five years,

the quantity being proposed for subcontracting, which are in satisfactory

operation/use for the past two years as on the date of bid opening.

Refer to Item 97

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99 Do we need to provide documentary evidence of the supplied parts in satisfactory

operation/use for the past two years as on the date of bid opening?

Yes, refer to 97

100 If needed which kind of documents are needed to support the above mentioned

history?

Yes, refer to 97

101 As per requirement of these two project, the vector group of all the 132kV power

transformers shall be Dyn1, and the cooling system is only by ONAN type. Plesase

confirm.

Vector group Refer to item 7; Type of cooling refer to item 40

102 As per Section VITech Specs , 9.3.2 The cells shall be in transparent

containersIn KPTSIP Technical Data Sheets, Table 23: The battery type should

be provided sealed OPzV, lead-acid, tubular plate, electrolyte in gel form.

The cells shall be in transparent containers

103 Can designer modify concept drawings in bidding documents? Yes, subject to meeting all minimum technical specif ications

104 How many cores are needed for 132kV and 33kV CTs? What is the parameter for

each core?

Refer to item 25 above.

105 Is the provided BIL values, i.e.275kV for power freqency and 650kV for lightning

overvoltage, already corrected as per the 1200 altitude?

These Values are given referenced to 1000m AMS level, Aplly

altitude correction factors as required by the applicable standars.

106 In Section VITech Specs , 11.5.7.Busbar Differential Protection of the high

impedance differential type shall be providedIn KPTSIP Technical Data

Sheets, Table 25: Protection Relays, shows low impedance Busbar Protection

shall be provided.

High impedance differential type shall be provided

107 Which type of the Busbar Protection should be provided , high impedance or low

impedance?

High impedance differential type shall be provided.

108 In Section VITech Specs , 12.Revenue Metering SYSTEMWe need to install

two meters : Main meter, Check meterIn KPTSIP Technical Data Sheets

Table 11:132kV Current TransformerIn KPTSIP Technical Data Sheets

Table 17: 33kV Current Transformer

YES: Main meter and check meter

109 Whether the revenue meters should be provided for 132kV bays or not ? Bay extensions meter at 132 KV, new substations at 33 KV. Other

details will be finalised during contract negotiations

110 The core 1 of CT is for measuring ,the core 2 is for metering ,the other cores are

for protection , Whether Main meter and Check meter connect the core 2 or

different cores?

Main meter and Check meter can be connected on one CT;

however, final design is the responsibility of the Contractor

subject to approval by Project Manager

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111 Please clarify the number of tripping coil for 33KV circuit breaker outdoor. The

operating mechanisms shall have one tripping coil as per Volume 2 Section-VI

Employers Requirements subclause 5.1.4, but 2(two) opening/tripping coil are

required in Tenders Technical data sheet. Normally its just one for 33kv voltage

level in accordance with international practice.

A Circuit Breakers shall be providded with two (2) Tripping Coils.

112 Please consider the need for LOCAL CONTROL CABIENT for 132KV CB and DS+ES in

Volume 2 SectionVI Employers Requirements subclause 4.3.3 CIRCUIT BREAKER

LOCAL CONTROL CABINET and 4.4.2. CONSTRUCTION AND OPERATION.

All Circuit Breakers shall be providded by a LOCAL CONTROL

CABINET; Isolators shall be as per Section 4.4.3

113 Presently the local control cabinet especially under 220kv switchgear is not

necessary but instead of mechanism enclosure which comprises all local control

accessories and electrical connections to the CB or DS+ES based on economy and

compactness.

Regadless of the Bay level Distributed control box, each Breaker

shall be providded by means of Local control both electrically and

manually all of which shall be housed in local cabinet with

minimum IP 54 protection according to IEC- 60529.

114 Please clarify what shall the bidder provide for handling Circuit breaker SF6 gas.

There is discrepancy between Price Schedule TOOLS and Volume 2 SectionVI

Employers Requirements subclause 4.3.4 SULPHUR HEXACHLORIDE.

The Set of SF6 filling device with pressure gauge shall include

mobile gas handling facilities for filling, evacuating and

processing switchgear SF6. Such plant shouild meet all the

technical specification as per Section 4.3.4.

115 Kindly inform you the price of mobile gas handling plant for gas recycle is very

higher than the SF6 filling device with pressure gauge. The former can process SF6

and reduce the gas pressure in switchgear but the latter hasnt this function.

The contractor shall provide the appropriate design for this

function as per the specifications.

116 Please clarify the degree of protection of circuit breakers enclosure to meet the

IEC requirement. As per Employers Requirements subclause 4.3.3 for 132kv C.B,

min. IP54 according to IEC60529 is be required. But in Technical data sheet is

IP65. And the same issue for 33kv C.B.

Min. IP65 according to IEC-60529

117 Kindly furnish GA drawing NO. 5083020-LES-002 for Lessos substation indicatingscope of works.

Further details shall be provided to winning Bidder.

118 Nanyuki s/s: Kindly confirm whether 132kV bus bar extensions is included in the

present scope of works or not.

Bus bar extensions incorporating a main and reserve bus bar will

be included in the scope an addendum will be issued.

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119 Nanyuki s/s: As per the scope of works 'flying (raised height) bus bar is in the

scope,however in SLD and GA layoout the same is not in the scope.Kindly confirm

the scope for bus bar extension.

Refer to Item 108

120 Kindly furnish GA drawing NO. 5083020-OLK-002 for Olkaria substation indicating

scope of works.

Use scope of work as shown on revised SLD.

121 Olkaria s/s: As per SLD,two sets of Current transformers are required in the bus

coupler bay,however the same are not included in the price schedule.Foundation

for these CTs are also missing

Quatities to be revised as per scope of work as shown on revised

SLD.

122 Sotik s/s The bus CVT and its foundation is not included in the price

schedule.Kindly confirm the requirements of Bus CVT

Include bus CVT and its foundation in scope.

123 Sotik s/s As per the scope of work,control building is in the scope,however the

same is not included in the price schedules.please clarify.

Include adequately sized Control Building

124 Sotik s/s As GA drawing and scope of work,roads inside the switchyard

,fencing,drains etc will be in scope of work,however the same are not included in

the price schedule.Kindly confirm the scope.

Include all necessary civil works

125 Sotik s/s the scope work includes,AC &DC auxillary system including battery and

battery charger,however,the same is not included in the price schedule.Please

clarify.

Include in the Price schedule

126 Bomet s/s; Foundation quantity for the 132kV circuit breakers is mentioned as

1No.however the same is 2No. As per scope of works.Please clarify

Two Required, one for the line and one for the btransformer.

127 Narok s/s;foundation quantities for 33kV CB ,VT and disconnectors are not

matching with actual quantity required as per scope of work & SLD/GA .Kindly

review and confirm

Use quantities as per SLD

128 Narok s/s;Quantiities for 132kV disconnector with and without earthswitches for

the transformer bay are included as 2No. Each in price schedule,however as per

SLD, the quantity is 2No.for disconnector without earthswitch and 0No.for

disconnector with ES.Kindly confirm


129 Narok s/s;A total of 6NO. Feeders are mentioned in price schedule,however as

per scope of work and SLD & GA only four feeders are in scope.Kindly confirm the

scope of works and amned quantitiesfor 33kV equipment in price schedule.

Use 4 Feeders.Bidders to ammend the price schedules

accordingly.

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130 Narok s/s; 1No. 33kV bus section is included in the price schedule,however the

same is not mentioned in the scope of works and SLD & GA drawings,Kindly

confrim the scope.

Assume quantities as per SLD.

131 Nyahururu s/s;Foundation quantity for the 132kV circuit breakers is mentioned as

1,however the sameis 2 as pr scope of work&SLD/GA

Use a quantity of two; one line breaker and one transformer

breaker.

132 Nyahururu s/s;Foundation quantity for the 33kV CB,VT 7 Disconnector are not

matching with actual quantity required as per scope of works& SLD/GA. Kindly

review and confirm.


133 Nyahururu s/s;Quantiities for 132kV disconnector with earthswitches for the

transformer bay is mentioned as 1No.in price schedule,however as per SLD, the

quantity is shall be 0No.Please clarify.

Use 1No. For Line Bay; however, Contractor to provide an

optimal quantity to meet the functional specification.

134 Kabarnet s/s;Quantiities for 132kV disconnector with and without earthswitches

for the transformer bay are included as 2No. Each in price schedule,however as

per SLD, the quantity is 2No.for disconnector without earthswitch and 0No.for

disconnector with ES.Kindly confirm

Use 1No. For Line Bay; however, Contractor to provide an

optimal quantity to meet the functional specification.

135 Ishiara s/s;132kV bus CVT and its Foundation is not included in the price

schedule.Kindly confirm

Include. Bidders to revise the Price schedules accordingly.

136 Ishiara s/s;As per scope of work,control building is in the scope ,however the

ssame is not included in the price schedule.Please clarify.


137 Ishiara s/s;As per GA drawing and scope of work, roads inside switchyard

,fencing,drains etc will be in scope of work,however the same is not incledue in

the price schedule.Kindly confirm and ammend accordingly.


138 Ishiara s/s;the per scope of work includes AC,&DC, auxillary supply systems

including battery & battery charger,however the same are not included in the

price schedules.Please clarify.


139 Mwingi s/s extension; scope of work bifurcation for existing & present scopeindicated in SLD is not matching with with the same in price schedule &GA

drawing.Please clarify.

Use scope of work as shown on SLD.

140 Wote s/s;The 33kV disconnector quantity for the 33kV feeder bays in price

schedule is mentioned as 4No.However sa per scope of work the & drawing the

asme is 8No.

Assume 4No.

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141 Sultan Hamud s/s; As per scope of work &SLD,132kV side of substation shall have

double bus bar scheme,however in GA drawing No. 50883020-sHD-001 Rev

A,132kV swichyard with switchyard with single bus has been shown.Kindly furnish

revised drawing with double bus bar scheme alongwith the 132kV bus

section&bs coupler bay as per requirement.

A double bus bar scheme shall be installed as per the SLD, a

revised GA shall be issued.

142 Sultan Hamud s/s; 132kV disconnector quantity in transformer bay in price

schedule is mentioned as 2no. However as per scope of work, and drawing the

same shall be 3no.(Two no. for bus disconnector and one for transformer

bay.Please clarify.

Use scope of work as shown on revised SLD.

143 Sultan Hamud s/s;Quantiities for 132kV CB&CT for bus section bay and bus

coupler bay are not included in supply and installation price schedule. Only 132kV

disconnectors fpr these two bays are indicated under 132kV bus bar

scheme.Please clarify.


144 Sultan hamud s/s; Please confirm whether we can use Tandem (Staggered)

arrangement for 132kV disconnectors in Sultan Hamud substation.This kind of

arrangement will save 132kV gantry structures for line and tranformer baty in

switchyard.Kindly confirm.

Use flexible arrangement that will allow reasonable future

expansion.

145 KIeni s/s;Quantiities for 132kV disconnector with and without earthswitches for

the transformer bay are included as 1No. however as per SLD, the quantity shall

be 2No.for disconnector without earthswitch and 0No.for disconnector with

ES.Please clarify.

Refer to SLD.

146 132kV & 33kV CTs in transformer bays are indiacted between surge arrestor and

transformer.Kindly confirm whether the same are bushing CTs as part of

transformer or separate pedestal mounted CTs.If the same are separate CTs then

they shall be placed between CB and transformer end disconnector.Kindly review

and confirm.

These shall be separate pedestal mounted CTs

147 In the price schedules 33kV surge arrestors is mentioned fo rall the 33kV auxillary

transformer feeders in the new substations,however in single line diagram thesame has ont been indicated.Kindly confirm the requirement.

33kV surge arrestors required on all auxillary transformer

feeders.

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148 In the price schedules materials required for both types of bus bars are

mentioned i.e. copper tubes as well as gantries,flexible conductors and string

insulators.Kindly confirm whether the 132kV bus bar are of strung bus with

flexible conductors or with pipe type conductor installed on 132kV BPI

Assume 132kV bus bar to be strung bus with flexible conductors

of equivalent current ratings for new substations; However for

existing substations use the compartible system. Final design to

be discussed with winning bidder.

149 Further in all the drawings strung bus bars with bus bar gantries type

arrangement has been indicated.Whereas under specification ACSR conductors or

tubular aluminium pipes are to be used for busbar and live connections (Clause 4.mentioned under busbar system for all substations.Kindly confirm the exact

requirements.

Refer to Item 148

150 Kindly furnish conductor type and size to be considered for 132kV & 33kV bus

bars,transformer and feeder bays for all substations in scope.

Refer to Item148

151 Could you give any information aboutthe Interface of "BAY EXTENSION AT LESSOS

132/33 KV SUBSTATION" (because lack of layout drawing), and whether

busbar(including support) for the interface is required or not?

Busbar extension and all work required to be connected as per

the existing system.

152 The 33kV circuit breaker type can be vacuum or SF6, please clarify which one you

are inclined to use?

Vacuum/SF6 CB for 33kV.

153 132kV and 33kV copper tubes busbar is adopted in tender, but rarely used in

China, and clarify what reason it is. Perhaps because of the local wind speed?

Refer to Item148

154 Are we free to use Aluminium magnesium alloy bus instead of the Main busbar

copper tubes?

Refer to Item148

155 The secondary winding voltage of VT is 110V in former substations like city

square substation, but in this tender it is 100V, please make sure its correct.

VT secondary for all new Substation shall be 110V; however, for

existing substatios, use same as available

13B:sultan substation

1.1 132KV busbar: the drawings indicate the busbar should be soft busbar, but

while the price schedule indicates the busbar should be busbar copper tube,

which will prevail?

Refer to Item148

1.2 132 busbar coupler and the sectional circuit breakers are in idicated in the

single line diagram but not in the arrangement diagram, which will prevail?


1.3 in the 132KV single line diagram, busbar wiring method is double busbar with

singlesectionalized wiring but in the arrangement diagram it is single busbar

arrangement, which will prevail?

Use Double Busbar

156

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1.4 As for the 33kv side, the technical description, single line diagram and the

price schedule all indicate that there should be 4 outgoing line bays but the

arrangement diagram indicates there should be 5 33kv outgoing line bays, which


23B:kieni substation

2.1 As for the 33kv side, the technical description indicates there should be 2

outgoing line bays, while the single line diagram and the price schedule indicate

that there should be 4 outgoing line bays, but still the arrangement diagram

indicates there should be 5 33kv outgoing line bays, which will prevail?


33B:kitui substation




will prevail?


43B:vote substation




will prevail?


LOT 3A

13A:narok substation




will prevail?


23A:olkaria substationto be expanded

2.1 There is no general arrangement diagram Use SLD, further details will be discussed with winning bidder.

33A:bomet substation3.1 As for the 33kv side, the technical description, single line diagram and the



will prevail?


43A:lessos substationto be expanded

157

158

159

160

161

162

163

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4.1 There is no general arrangement diagram Use SLD, further details will be discussed with winning bidder.

53A:kabarnet substation




will prevail?


165 Nyahururu s/s; As for the 33kv side, the technical description, single line diagramand the price schedule all indicate that there should be 4 outgoing line bays but

the arrangement diagram indicates there should be 5 33kv outgoing line bays,

which will prevail?


166 In the bidding documents we did not notice any reactive power compensation

unit configurations for all the new substations to be constructed, so could you

please consider if it is necessary to add them?

No, feasibility studies did not show requirement

167 132 Kv Post-Type Insulator / String Insulator - As per Clause No. 4.8.3.3 & 4.8.3.4

of Vol 2 of 2, page-53 (Hard copy), It has been indicated that the total specific

creepage distance shall be at least 25 mm/kV.Refer table-20 of Data sheet of vol-

2 of 2, page-52 (Hard copy), Nominal creepage distance is indicated as 31mm/kV.Please clarify.

31 mm/kV

168 Bus Bar Conductor Material-As per Clause No. 4.8.1 & 4.8.2 of Vol 2 of 2, page-

50,51 (Hard copy),it has been indicated that bus bar material is Al, aluminium

alloy or copper (ACSR 435/5mm2)-Refer table-15 of Data sheet of vol-2 of 2, page-

44 (Hard copy), bus bar conductor material has been mentioned ( ACSR

435/55mm2).As per Schedule no.1 Plant and Mandatory Spare parts Supplied

from abroad like under Schedule no. 1.1 lot 3a Sl. No. NRK-401,NRK-802,Schedule

no. 1.3,lot 3a Sl.no. -1STK-201 etc. has been mentioned that bus bar material is

cu.tube. Please clarify what is the bus bar conductor material.

Refer to Item 148

169 Bus bar Conductor size - Refer table-15 of Data sheet of vol-2 of 2, page-44 (Hard

copy), current carrying capacity of ACSR conductor ( 435/55mm2) is mentioned

2000 Amp.We understand this conductor can take approx. 750 A current. Please

clarify.

Quote for single strung ACSR conductor ( 435/55mm2) in the Bid;

design variations shall be discussed with winning bidder.

164

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170 33 KV Disconnector-As per Clause No. 5.2.1 of Vol 2 of 2, page-56 (Hard copy),it

has been indicated that disconnector and earthing switches shall be maually

operated.As per SLD like 5083020-BMT-001,5083020-KBT-001 etc.it is

motorised.As per Layout, motorised disconnector can not be provided. Please

clarify.

33 KV Earth Switches shall not be motorised

171 Earth resistivity value-Not defined in specification.Kindly Provide the earth

resistivity value for each substation.

Refer to item 91

172 Material of Earthing-As per Clause No. 6.3,6.4,6.5,6.6,6.6.1 pg- 61,62,63 of Vol 2of 2, page-56 (Hard copy), it is GI. And As per clause no. 16.16.2 , it is Cu.Please

clarify

Use Copper

173 LT Power Cable -Specification is not available -Please confirm whether cable to be

considered with AL conductor PVC insulated or with Cu Conductor PVC insulated

Design calls for Out door busbar which does not require 33 KV

cable. All control cables shall be copper.

174 132 KV CT - Refer table-11 of Data sheet of vol-2 of 2, page-35 (Hard copy), CT has

5 cores,As per SLD like 5083020-BMT-001,5083020-KBT-001 etc. , CT has 3

cores.Please clarify.

Minimum required is 5 Cores

175 33 KV CT - As per Clause No. 11.5.1 of Vol 2 of 2, page-139 (Hard copy).

Duplicated protection & protection Segregation. It is considered only for 132 KV

system or for 33 kV system also.Please clarify.

Duplicated protection shall be providded for 132kV; Segregation

back-up protection shall be used for provided for only 132kV.

176 33 KV CT-As per Clause No. 11.2 of Vol 2 of 2, page-136 (Hard copy), it is

mentioned for high impedance differential protection.Refer table-11 of Data

sheet of vol-2 of 2, page-47 (Hard copy), CT has 4 cores.As per SLD like 5083020-

BMT-001,5083020-KBT-001 etc. , CT has 3 cores.Please clarify.

Overcurrent and earth fault protection for the 22 KV line feeders

is required. For number of cores, Refer to item 27

177 132 kV VT - As per Clause No. 11.5.1 of Vol 2 of 2, page-139(Hard copy), It has

been mentioned for " Separated voltage circuit".Refer Table no. 10 of VOL- 2 of 2

, Pg - 33 ,Accuracy class defined in data sheet is 0.2 for metering 0.5 of metering

& 3P for protection. As per SLD like 5083020-BMT-001,5083020-KBT-001 etc. , VT

has 2 cores.Please clarify number of cores of VT.

Refer to item 26

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178 33 KV VT-As per Clause No. 11.5.1 of Vol 2 of 2, page-139(Hard copy), It has been

mentioned for " Separated voltage circuit".Refer Table no. 13 of VOL- 2 of 2 , Pg -

40 ,Accuracy class defined in data sheet is 0.2 for metering 0.5 of metering & 3P

for protection.As per SLD like 5083020-BMT-001,5083020-KBT-001 etc. , VT has 2

cores.Please clarify number of cores of VT.

Refer to item 177

179 33 KV feeder Conductor -Bus bar conductor size for 800A for 33KV system is not

specified in specification.Please specify the same.


meets the technical specifications in terms of the Normaloperational curent level and system Fault leves.

180 33 KV Bus Bar Conductor- Bus bar conductor size for 1250A for 33KV system is not

specified in specification.Please specify the same.


meets the technical specifications in terms of the Normal

operational curent level and system Fault leves.

181 Cable trench for extension bay-Cable trench for extension bay in existing

substation to be considered only in extension by or upto control room. Please

Clarify.

Trench require only to join to the next (closest trench section

182 layout for OLKARIA Geothermal PS substation - Proposed layout for OLKARIA

Geothermal PS substation is not available in documents.Please provide the

existing and proposed substation layout.

See addendum

183 OLKARIA Substation-As per Clause No. 1.2.5 of Vol 2 of 2, page-4(Hard copy),the

extension bay shall be made approx. 1Km away from existing substation.In that

case what will be the location of control & relay panel. Please clarify.

The location of the control and relay panels is approximately 200

m from the switchyard

184 Proposed layout for LESSOS substation - Proposed layout for LESSOS substation is

not available in documents.Please provide the existing and proposed substation

layout.

The bidder shall work with the SLD. The GL shall be provided with

the winning bidder

185 Sultan Hamud Substation - Proposed layout ( Drg .no.- 5083020-SHD-002) givenfor Sultan Hamud is not matching as per given SLD ( Drg. No.-5083020-SHD-

001).Please Clarify.

Refer to item 141

186 ACDB, DCDB,LDB, Battery & Charger - In existing substations ACDB,DCDB,LDB

Battery & Battery Charger to be considered or Not? Please Clarify.

This to be considered for all existing substations.

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187 132 KV minimum current feeder rating - As per Clause No. 2.2 of Vol 2 of 2, page-

12 (Hard copy) , minimum current rating for feeder and incomer switchgear is

1250A.Refer Table no. 11 of VOL- 2 of 2 , Pg - 35 ,CT ratio for 800-400-200/1-1-

1A.Please clarify the feeder conductor current rating.

For 132kV feeders, conductor is Lynx, 175 mm2 conductor

188 33 KV minimum current feeder rating - As per Clause No. 2.2 of Vol 2 of 2, page-

12 (Hard copy) , minimum current rating for feeder and incomer switchgear is

800A.Refer Table no. 17 of VOL- 2 of 2 , Pg - 47 ,CT ratio for 400-200-200/1-1-1A.Please clarify the feeder conductor current rating.

For 33kV feeders, conductor is 100 mm2 ACSR conductor

189 Bus Bar Shield Wire-As per Clause No. 4.8.1 of Vol 2 of 2, page-50 (Hard copy) ,

nominal cross section area is 95 sqmm and material is cu.Refer Table no. 16 of

VOL- 2 of 2 , Pg - 46 ,, nominal cross section area is mentioned 50 Sqmm and

material is steel galvanized.Please confirm the Shield wire size and Material.

95 sqmm

190 SCMS System -As per Clause No. 11 of Vol 2 of 2, page-134 (Hard copy) , SCMS (

substation control & monitoring system) to be provided only for 132 kv system or

for 33 KV system also.Please clarify.

Cover the whole sub station

191 Natural Ground Level - Kindly provide the Natural Ground Level ( Contour Plan of

Substation).

To be ascertained by winning bidder during detailed

survey.Bidders to gather enough information on their own for

bidding purposes.

192 Finished ground/ road Levels - Kindly provide Finished ground/ Road Levels (

Internal & External)

To be ascertained by winning bidder during detailed survey.Not

necessary for this stage.

193 Embankment length & levels-Embankment length & levels is not clear. Please

confirm.

To be ascertained by winning bidder during detailed survey.Not


194 Ground Water Table,Please specify the same. To be ascertained by winning bidder during detailed survey.Not


SECTION IV: PRICE SCHEDULE 1 & 4

Include all the requirements in schedule 4195

SECTION IV: PRICE SCHEDULE 1 & 4 - Low voltage auxiliary power supply systems

as specified in vol 2 and mainly consisting of : In Sch 1 supply part Low voltage

cables and accessories (terminals, lugs, glands, conduits, labels etc.) is mentioned

at sub item no 5 while in sch 4 installation part this item is missing. (for New and

Extension Bay). Kindly Clarify the scope.

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196

SECTION IV: PRICE SCHEDULE 1 & 4 Substation protection equipment sub item 8

Other necessary material (inclusive of at least three control, protection and

metering panel) Refer to sub chapter 17.5.19 ,Reference sub chapter CL 17.5.19

is not available in tender document. Kindly provide the clause.

Refer to relevent chapter 11

197CONTROL AND POWER CABLE - Kindly provide Technical specification of control

and power cable.

Refer to chapter 16 of the Technical specifications and relevant

IEC standards

198

BAY EXTENSION S/S EXISTING DETAILS - Please provide following information of

the all existing substation where bay extension work is to be carried out. 1)

Control voltage (DC) 2) bus bar protection (High/low impedance) scheme 3) type

and make of bus bar protection relay. 4) Availability of no of spare bay modules.

Refer to Bid document and previous queries above

199

SAS FOR BAY EXTENSION AT EXISTING SUBSTATION -We understand that

matching of old and new SAS shall not be feasible, therefore our scope will be

limited to functionality for the extended bays only. Kindly confirm.

Complete functional intergration and compatibility of new

facilities to the existing facilities shall be the responsibility of the

Bidder

200

TELE COMMUNICATION SYSTEM FOR BAY EXTENSION AT EXISTING SUBSTATION -We understand that matching of old and new system shall not be feasible;

therefore our scope will be limited to functionality for the extended bays only.

Kindly confirm.

refer to item 199

201

TELE COMMUNICATION SYSTEM -Section VI Tech spec Cl no 13.2.1 and 13.2.2 -

Couple of items specified in the said clauses are standardized by employer which

leads to lack of competition. Kindly allow us to offer equivalent other make

without losing any functionality.

Follow given specifications in the document

202

Section VI Cl no 9.3 -Tech spec -Battery - Tech spec calls for 110V battery set of

Lead Acid type and even in the list of spares also Hydrometers 2 Nos is asked with

the battery set which supports that battery cell is with electrolyte in liquid form

(Lead Acid).While in Technical Data sheet Table 23 battery cell is asked with

Refer to item 102

203

Section VI Cl no 3.14.3 -Tech spec -Power Transformer - Kindly accept the type

test report of power transformer conducted on higher MVA rating instead of

similar rating.

Type test will be accepatable for similar transformer with the

same specification and design.

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204

General - Kindly provide the data ( type designation and diameter) for conductor

for the 132kV line terminating to Sub-Station so as to ascertain the design of

gantry, the clamp connectors for LA and CVT

Line conductor is Lynx 175 mm2 ACSR conductor

SECTION IV: PRICE SCHEDULE 1 & 4 - Narok S/S

205

Auxiliary Transformer Sch 1 & 4 - In Sch 1 item no NRK-102 qty is 1 pcs for supply

while in Sch 4 item no 4NRK-102 qty is 2 pcs for installation. Kindly remove the

discrepancy.

Refer to SLD and update the schedule 4 accordingly

206

Voltage Transformer 132kV Sch 1 & 4 - In Sch 1 item no NRK-202 qty is 3 pcs for

supply while in Sch 4 item no 4NRK-202 qty is 6 pcs for installation. Kindly remove

the discrepancy.


207

Surge arresters 132kV Sch 1 & 4 - In Sch 1 item no NRK-301 qty is 3 pcs for supply


discrepancy.


208

Current Transformer 132kV Sch 1 & 4 - In Sch 1 item no NRK-302 qty is 3 pcs for


the discrepancy.


209Circuit breakers 132 kV Sch 1 & 4 -In Sch 1 item no NRK-303 qty is 1 Set for supplywhile in Sch 4 item no 4NRK-303 qty is 2 Set for installation. Kindly remove the

discrepancy.


210

Motorise Isolator with earth switch 132kV Sch 1 & 4 - In Sch 1 item no NRK-305 is

missing for supply part while in Sch 4 item no 4NRK-305 qty is 2 Sets for

installation. The SLD shows only motorised Switching disconnector without earth

switch only. Kindly remove the discrepancy.


211

Marshalling boxes (outdoor) Sch 1 & 4 - In Sch 1 item no NRK-306 qty is 1 pcs for


the discre anc .


212

o tage rans ormer c - n c tem no - ty s pcs or

supply part while in Sch 4 item no 4NRK-401 is missing for installation part. The

SLD shows 3nos of VT to be supplied and installed. Kindly remove theRefer to SLD and update the schedule 4 accordingly

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213

Motorise Isolator with/Without earth switch 33kV Sch 1 & 4 - In Sch 1 item no

NRK-501 Qty is 2 Sets for supply part while in Sch 4 item no 4NRK-501 qty is 4 Sets

for installation. Kindly remove the discrepancy


214

Surge arresters 33kV Sch 1 & 4 - In Sch 1 item no NRK-502 qty is 3 pcs for supply


discrepancy.


215

Voltage Transformer 33kV Sch 1 & 4 - In Sch 1 item no NRK-503 qty is 3 pcs for


the discrepancy


216

Current Transformer 33kV Sch 1 & 4 - In Sch 1 item no NRK-504 qty is 3 pcs for


the discrepancy.


217Neutral link - In Sch 1 item no NRK-505 qty is 1 pcs for supply while in Sch 4 item

no 4NRK-505 qty is 2 pcs for installation. Kindly remove the discrepancy.Refer to SLD and update the schedule 4 accordingly

218

33kV Outgoing feeder Sch 1 & 4 item no 600-606 - In Sch 1 for supply part the qty

mentioned is as per 4 X 33kV feeders while in Sch 4 for installation part the qty of

same is mentioned for 6 X 33kV feeders. Kindly remove the discrepancy.


219

us ect on c tem no - - s per t e no us secton s

shown. Therefore In Sch 1 for supply part the qty mentioned is 0 for all items

while in Sch 4 for installation part the qty of same is mentioned 1 nos for each

items. Kindl remove the discre anc .

Refer to SLD

220

33kV bus bar system mainly consisting of Sch 1 & 4 item no 800-810- In Sch 1 for

supply part the qty is mentioned for all bus bar items while in Sch 4 for

installation part the qty for this bus bar item of same is missing for each items.

Kindly remove the discrepancy.


221

Civil work: foundation for 33kV Circuit breakers Sch 4 in Section IV -As per the

SLD 33kV circuit Breaker are 5 sets. While in Sch 4 it is mentioned as unit Lot and

qty is 8. Kindly remove the discrepancy.


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222

Civil work: foundation for 33kV Voltage Transformer Sch 4 in Section IV - As per

the SLD 33kV Voltage Transformer are 18 nos. While in Sch 4 it is mentioned as

unit Lot and qty is 24. Kindly remove the discrepancy.


223

Civil work: foundation for 33kV 33 kV disconnector with/ without earth switches

Sch 4 in Section IV - As per the SLD 33kV 33 kV disconnector with/ without earth

switches are 10 nos. While in Sch 4 it is mentioned as unit Lot and qty is 17. Kindly

remove the discrepancy


224Civil work: foundation for 132kV Circuit breakers Sch 4 in Section IV - As per theSLD 132kV circuit Breaker are 2 sets. While in Sch 4 it is mentioned as unit Lot and



SECTION IV: PRICE SCHEDULE 1 & 4 Bomet S/s

225

33kV Voltage Transformer Sch 1 & 4 in Section VI - As per the SLD 33kV Voltage

Transformer are 6 nos. While in Sch 1 for supply and Sch 4 for installation it is

mentioned qty as 18. Kindly remove the discrepancy.


226

Civil work: foundation for 33kV Voltage Transformer Sch 4 in Section IV ,As per

the SLD 33kV Voltage Transformer are 6 nos. While in Sch 4 it is mentioned as unit

Lot and qty is 15. Kindly remove the discrepancy.


227

Civil work: foundation for 132kV Circuit breakers Sch 4 in Section IV As per the




SECTION IV: PRICE SCHEDULE 1 & 4 Kabarnet S/s

228

Motorise Isolator with earth switch 132kV Sch 1 & 4 In Sch 1 item no KBT-305 is

missing for supply part while in Sch 4 item no 4KBT-305 qty is 2 Sets for




229

Civil work: foundation for 132 kV post insulators Sch 4 in Section IV The Qty of

Post insulator shall depend on design of substation in Sch 1 & 4 supply &installation part it is indicated as lump sum 1 while in civil part it is mentioned as

Lot 2. Kindly remove the discrepancy.


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230

33kV Voltage Transformer Sch 1 & 4 in Section IV As per the SLD 33kV Voltage

Transformer are 6 nos. While in Sch 1 for supply and Sch 4 for installation it is

mentioned qty as 18. Kindly remove the discrepancy.


231

Civil work: foundation for 33kV Voltage Transformer Sch 4 in Section IV As per

the SLD 33kV Voltage Transformer are 6 nos. While in Sch 4 it is mentioned as unit

Lot and qty is 15. Kindly remove the discrepancy.


SECTION IV: PRICE SCHEDULE 1 & 4 Nyahururu S/s

232

Voltage Transformer 132kV Sch 1 & 4 - In Sch 1 item no NYH-202 qty is 3 pcs for

supply while in Sch 4 item no 4NYH-202 qty is 6 pcs for installation. Kindly remove

the discrepancy.


233

Motorise Isolator with earth switch 132kV Sch 1 & 4 In Sch 1 item no NYH-305 is

missing for supply part while in Sch 4 item no 4NYH-305 qty is 2 Sets for




234

Installation of Auxiliary transformer feeders 33 kV mainly consisting of: item no

4NYH-704 to 706 SECTION IV : SCH 4 In this schedule this items appears at twotimes i.e. 704 to 706 and 811 to 812. Kindly remove it at 704 to 706 in sch 4.

Refer to to the SLD and update the price schedules appropriately.

Its the bidders responsibility to design an optimal system thatmeets the technical specifications.

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235

Civil work: foundation for 33kV Circuit breakers Sch 4 in Section IV As per the



Refer to to the SL

Documents

Clarification Draft Responses Note for KPTSIP Lot3Aand3B