Cooler Data

COOLER DATA

COOLER DATA

H2 COOLEREXCITER COOLERSEAL OIL COOLER (AIR SIDE)SEAL OIL COOLER (H2 SIDE)PRIMARY WATER COOLERDESIGN DATA FOR THE H2 COOLER

TYPE:

2 X KG12-356/29/6/2-NSV-SR20 (4 SECTION, 25% EACH)U NITSMATERIAL & PRESSURE

HYDROGEN PRESSURE4barFINSCu

GAS FLOW33m3/sTUBESCuZn28Sn

HEAT DISSIPIATING CAPACITY4.859GcalTUBESHEETCuZn40

COLD GAS TEMP43OCWATER CHANNELSSTEEL WITH PROTECTIVE COATING

HOT GAS TEMP75OC

GAS PRESSURE DROP6.6mbarPRESSURE

COOLING WATER FLOW150dm3/sPERM. OPERATING 10 bar

MAX. WATER INLET TEMP38OCTEST PRESSURE 15 bar

WATER OUTLET TEMP47OC

WATER PRESSURE DROP200mbar

DESIGN DATA FOR THE EXCITER COOLER

TYPE:

2 X KG11-280/19/10/2-NSV-SR50 (2 SECTION, 50% EACH)

AIR FLOW15.5m3/sTUBESCuZn28Sn

HEAT DISSIPIATING CAPACITY0.43GcalTUBESHEETCuZn40

COLD AIR TEMP43OCWATER CHANNELSSTEEL WITH PROTECTIVE COATING

HOT AIR TEMP71.7OCFINSCu

AIR PRESSURE DROP4.9mbarPRESSURE

COOLING WATER FLOW23.88dm3/sPERM. OPERATING 10 bar


WATER OUTLET TEMP43OC

WATER PRESSURE DROP50mbar

DESIGN DATA FOR ONE SEAL OIL COOLER (AIR SIDE)

TYPE:

3C2720-4050-060AD (1 SECTION)

OIL FLOW3.33dm3/sTUBESSoMs71

HEAT DISSIPIATING CAPACITY0.12GcalTUBESHEETMUNTZ METAL

OIL INLET TEMP70OCWATER CHANNELSSTEEL WITH PROTECTIVE COATING

OIL OUTLET TEMP45OC

OIL PRESSURE DROP (app.)0.833barCOOLING WATERS SIDE PRESSURE



WATER OUTLET TEMP42OCOIL SIDE PRESSURES

WATER PRESSURE DROP (appr.)0.440barPERM. OPERATING 16 bar

TEST PRESSURE 24 bar

DESIGN DATA FOR ONE SEAL OIL COOLER (H2 SIDE)

TYPE:

3C2222-4050-050AD (1 SECTION)

OIL FLOW2.17dm3/sTUBESSoMs71

HEAT DISSIPIATING CAPACITY0.069GcalTUBESHEETMUNTZ METAL

OIL INLET TEMP70OCWATER CHANNELSSTEEL WITH PROTECTIVE COATING

OIL OUTLET TEMP45OC

OIL PRESSURE DROP (app.)0.850barCOOLING WATERS SIDE PRESSURE



WATER OUTLET TEMP42OCOIL SIDE PRESSURES

WATER PRESSURE DROP (appr.)0.300barPERM. OPERATING 16 bar


DESIGN DATA FOR PRIMARY WATER COOLER

TYPE:

Ns 35/280/23/14/1.2/1 (2 SECTION)

PRIMARY WATER FLOW18.06dm3/sTUBESSF-Cu

HEAT DISSIPIATING CAPACITY2.15GcalTUBESHEETCuNi10Fe

PRIMARY WATER INLET TEMP81.5OCWATER CHANNELSH II WITH PROTECTIVE COATING

PRIMARY WATER OUTLET TEMP48OCSHELL1.4541

PRIMARY WATER PRESSURE DROP (app.)510mbarPRIMARY WATER SIDE PRESSURE



WATER OUTLET TEMP4.2OCCOOLING WATER SIDE PRESSURES

WATER PRESSURE DROP (appr.)160mbarPERM. OPERATING 16 bar


EXCITATION SYSTEM

A-WHEEL (NEGATIVE POLARITY)

NO./TYPE OF DIODES60 NO. /SSi1 12 120 S3 (SIEMENS)

NO./TYPE OF FUSES30 NO. /3 NC 9 538

RESISTANCE/VOLTAGE/CURRENT PER FUSEAPPROX. 150 micro ohm, 800 V, 800 A

NO. OF RC NETWORK6 NO.

B-WHEEL (POSITIVE POLARITY)

NO./TYPE OF DIODES60 NO. /SSi1 13 120 S3 (SIEMENS)

NO./TYPE OF FUSES30 NO. /3 NC 9 538

RESISTANCE/VOLTAGE/CURRENT PER FUSEAPPROX. 150 micro ohm, 800 V, 800 A

NO. OF RC NETWORK6 NO.

STROBOSCOPE

TYPELX5-30/36-2 (BIOCHINGER)

VOLTAGE240 V

FREQUENCY50/60 Hz

NO. OF STOBOSCOPE1

EXCITER AIR DRYER

TYPEM 120 (BERNER INTERNATIONAL GmbH)

VOLTAGE240 V

FREQUENCY50/60 Hz

ADSORPTION AIR FLOW RATE120 m3/h

REGENERATION AIR FLOW RATE35 m3/h

TYPE OF ENCLOSUREIP55

NO. OF DRYER1

ACTUATOR FOR EMERGENCY COOLING DAMPER IN BASE FRAME

TYPEVD6-AG100 (LEWA)

MOTOR1LA3063-2AA92ZK17 (SIEMENS)

RATING0.25 KW

VOLTAGE415 V

FREQUENCY50 Hz

CURRENT0.71 Amp

SPEED50 S-1


NO. OF ACTUATOR2 NOs.

ACTUATOR FOR EMERGENCY COOLING DAMPER IN ENCLOSURE

TYPEVS8-GK350 (LEWA)

MOTOR1LA3063-2AA92ZK17 (SIEMENS)

RATING0.25 KW

VOLTAGE415 V

FREQUENCY50 Hz

CURRENT0.71 Amp

SPEED50 S-1


NO. OF ACTUATOR1 NOs.

GAS SYSTEM

CO2 FLASH EVAPORATOR

RATING18 KW (6 X 3 KW)

VOLTAGE240 V

HEAT TRANSFER LIQUIDMARLOTHERM

VOLUME OF HEAT TRANSFER LIQUID25 dm2

HOLE IN ORIFICE2.8 mm

RELIEF VALVE ON HIGH-PRESSURE SIDE80 bar

RELIEF VALVE ON LOW-PRESSURE SIDE8 bar

NO.1 (FULL CAPACITY)

GAS DRYER

TYPE8.70 (BOLL+ KIRCH)

MOTOR1 LA 3073-2AA93 (SIEMENS)

RATING1.1 KW

VOLTAGE /FRQ415 V, 50 Hz

CURRENT2.5 Amp AT 380 V

SPEED48.5 S-1


VOLUME PF ABSORBENT MATERIAL20 dm3

HEATER RATING2.5 KW

REGENERATION AIR FLOW RATE65 m3/Hr


COMPRESSED AIR FILTER

TYPEAH (HUNDT AND WEBER)

VOLUME OF ACTIVATED CARBON13 dm3

SERVICE HOURSAPPROX. 1,500 TO 2,000 Hrs

THROUGHPUT80 m3/hr AT 8 bar

NO.1 FULL CAPACITY

GENERAL

MAKEBHEL

TYPETHDF 115/59

CODEIEC 34-1, VDE 0530

COOLING

STATOR WINDINGDIRECTLY WATER COOLED

STATOR CORE, ROTORDIRECTLY HYDROGEN COOLED

RATING

APPARENT POWER588 MVA

ACTIVE POWER500 MW

POWER FACTOR0.85 (LAG)

TERMINAL VOLTAGE21 KV

PERMISSIBLE VARIATION IN VOLTAGE+/- 5%

SPEED /FREQ RPM/ Hz3000/50

STATOR CURRENT16200 Amps

HYDROGEN PRESSURE Kg/cm24

SHORT CIRCUIT RATIO0.48

FIELD CURRENT (CALCULATED VALUE)4040 Amps

CLASS & TYPE OF INSULATIONMICALASTIC (SIMILAR TO CLASS F)

NO. OF TERMINAL BROUGHT OUT6

RESISTANCE IN OHMS AT 20 OC (UNIT # 6)

STATOR WINDING BETWEEN TERMINALS

U-X0.0014132

V-Y0.0014145

W-Z0.0014132

ROTOR WINDINGF1-F2 0.0672

MAIN EXCITER

ACTIVE POWER3780 KW

CURRENT6300 A

VOLTAGE600V

PILOT EXCITER

APPARENT POWER65 KVA

CURRENT195 A

VOLTAGE220 V (1+/- 10%)

FREQUENCY400 Hz

GENERATOR PROTECTIONGenerators are high quality for securing the best possible continuity of power supply. In addition to a suitable technical design &responsible mode of operation, provision has therefore been made for automatic protection facility. The following protection have been provided in the 500 mw TG.

1. GENERATOR DIFFERENTIAL PROTECTION (87G)

2. GENERATOR LOW FORWARD POWER PROTECTION (37G)

3. NEGATIVE PHASE SEQUENCE PROTECTION (46G)

4. POLE SLIPPING PROTECTION (98G)

5. UNDER FREQUENCY PROTECTION (81G)

6. LBB PROTECTION (50Z)

7. GEN. FIELD FAILURE PROTECTION (40G)

8. STATOR EARTH FAULT PROTECTION (64G1 & 64G2)

9. INTER TURN FAULT PROTECTION (95G)

10. OVER LOAD PROTECTION (51G)

11. OVER VOLTAGE PROTECTION (59G)

12. GEN. BACK UP IMPEDANCE PROTECTION (21G)

FIRE IN AIR PRE HEATER

AIR PRE HEATER FIRE FIGHTING PROCEDURE

_ Air heater fire alarm will appear. As IRDS is not effective this

alarm has been derived from excessive rise in air heater exit

flue gas temperature

_ Air heater rotor stopped.

_ Rapid and abnormal increase in air heater flue gas exit

temperature.

ACTIONS

a. Instruct boiler operator to start air heater soot blowing of the affected APH.

b. Try to assess extent of fire by visual inspection ( through inspection

window)

c. Continue air heater soot blowing and inform shift charge Engineer.

d. If temperature come normal stop soot blowing and observe for

further rise in temperature.

e. In case of reappearance of fire alarm again start air heater soot

blowing.

f. In case air heater fire alarm does not disappear or temperature of air

heater does not come down seek permission for boiler outage.

g. Trip the boiler.

h. After furnace is purged trip the F.D. Fan also. Keeping all air

heaters running (even the air heater which has caught fire).

i. Isolate the effected air heater from gas side (by closing its gas

outlet damper from control room).

j. Observe air heater temperature or sign of hot spot (from inspection

window).

k. In case temperature does not come down or any hot spot visual fire)

is observed DELUGE the air heater with copious amount of water.

l. Continue water spray till rotor is cooled.

m. Keep air heater running and remove inspection doors when it is safe

to examine.

n. Assess extent of damage and decide further course of action.

[ NOTE]:

(a) DO NOT HESITATE TO PUT WATER IN CASE CLEAR SYMPTOMS OF AIR

HEATER FIRE IS OBSERVED.

(b) If the fire has progressed to involve the metal the temperature inside the air

heater will be from 1100 C to 2200 C. Hence use of large quantity of water is

always recommended.

(c) While water quenching is on please ensure that :-

i) Air heater is running

ii) Water is getting drained is not accumulation of water in duct.

iii) Keep the air motor healthy by taking help of maintenance persons.

(d) While opening the fire water valve heavy cracking may be observed.

Steam with escape from leaky print and air heater chamber may get

pressurized.

(e) Do not use foam, chemical or steam for fire tightening because they will

not be effective.NTPC/SINGRAULI

DC SUPPLY SYSTEM FAILURE

220 V D.C POWER FAILURE IN STAGE -I (5X200MW)

INDICATIONS & CONSEQUENCES:

1. Annunciation of LOSS of 220 V DC supply will appear.

1. 220 V DC Voltmeters reading at generator panel & DCDB will show ZERO V.

2. MFR, TLR & UTR will not actuate, however,

a. All coal feeders will TRIP.

b. All Hot air gates will CLOSE.

c. All HONV will CLOSE.

d. HOTV & HORV will not OPERATE from UCB.

e. Generator and Turbine will continue to RUN

f. PSW pumps will TRIP.

g. Speeder Gear motor will become INOPERATIVE from UCB.

h. Field breaker status indication will DISAPPEAR. However breaker will continue to

be in CLOSED CONDITION.

3. 6.6 KV auxiliaries will continue to run, however,

a. Their Interlocks & protection will not work.

b. Their indicating lamps will NOT GLOW but ammeters will show the current.

c. Scoop position of all BFPs will come down to MINIMUM. & recirculation valve will

open.

NTPC/SINGRAULI

2

INSTRUCTIONS FOR SAFE SHUT DOWN OF UNIT

1. On DC failure PSW pump will trip. Immediately rush to Start PSW pump motor by

switching on overhead switch provided inside the PSW/SSW panel at 0 meter.

2. Gradually reduce load locally by manual operation of speeder gear hand wheel up to 5 to

10 MW.

3. As a parallel action, inform SCE /ASCE on station paging.

4. Inform unit # 1 UCE to start DG set

5. In case of abnormalities Such as :

Main steam temperature less than 465 Dec C

Stator slot temp. more than 90 Dec C

Drum level high-high.

Following action to be taken:

_ Hand trip the Turbine from local.

_ Trip Generator breaker.

_ Mechanically trip field breaker

_ Open the vacuum breaker.

_ Mechanically trip UATs A and B incomer breakers.

_ Mechanically Charge EMCC by closing DG set incomer after

mechanically tripping the incomer breaker from USS.

_ Start AC lube oil pump from ATRS panel

_ Start AC seal oil pump by operating over ride switch in local panel,

_ Start PSW pump motor by switching on overhead switch provided inside

the PSW/SSW panel at 0 meter.

_ Voltage and frequency of DG set should be watched closely

_ Ensure lube oil and seal oil system is normal. Put the Turbine on barring

gear.

_ In case of seal oil failure, purge out H2 gas and fill CO2 & Inform all the

concerned.

_ Trip all HT motor breakers manually

NTPC/SINGRAULI

3

6.2.0 220V DC POWER FAILURE IN STAGE II(2X500MW)

INDICATIONS & CONSEQUENCES:

- Annunciation of LOSS of 220 V DC supply will appear.

- 220 V DC Voltmeters reading at generator panel & DCDB will show ZERO V.

- All coal feeders will TRIP.

- 6.6 KV auxiliaries indicating lamps will NOT GLOW. However ammeters will show the

running status.

- 0.4 KV auxiliaries indicating lamps will NOT GLOW. However ammeters will show the

running status.

- Boiler will trip on loss of 220V DC power. HOTV will not get closed, however, HONV

will get close through MFR.

- Turbine will trip (as +/-24V DC supply is available).

- Interlock & protection of C&I system will remain out.

- Generator will not trip and as turbine has tripped Motoring will take place.

- Air side SOP will continue to run. H2 side SOP will trip. No alarm /annunciation will be

available at CXW 01 panel only ammeter will indicate whether motor is running or not.

- 50% protections of generator on DC 1 from same unit will be out and remaining 50%

protection on DC 2 from other unit will be in service.

INSTRUCTIONS FOR SAFE SHUT DOWN OF UNIT

1. Run the DG set from control room. Ensure correct selection of DC source at local

control panel of DG set.

2. Charge the EMCC after Mechanically opening incomer breaker from USS-A. In case

of non-availability of DG set, charge the Emergency MCC from the other Unit

after Mechanically tripping the incomers from USS-A and DG set

3. Hand Trip Generator Breaker from control room. Then trip field control breaker

manually in equipment control room CJN 1 panel.

4. Run AOP from ATRS panel and SOP from CXW panel after charging EMCC. Ensure

SOP running, failing which H2 purging should be initiated.

5. Trip the 6.6KV breaker of UAT-A and UAT-B manually from local. Unit bus will be

dead as tie will not come in service due to DC failure.

6. Run the standby air compressors from healthy units.

7. Put the Machine on barring gear.

8. Keep a close watch on Turbine, Boiler and Generator parameters.

NTPC/SINGRAULI

4

Loss of DC to UPS (5x200 MW Stage-I & 2x500 MW stage-II)

Two numbers inverters and three numbers UPS chargers, with batteries banks, are provided

for individual units. In case of Loss of UPS DC supply, UPS supply will change over to

standby alternate AC source and unregulated AC supply will remain available for C&I system

since AC supply is available.

Indication/Consequences

Following annunciations will appear on loss of DC to inverters.

- UPS charger A/B/C trouble &/or

- UPS Inverter A/Static switch A trouble &/or

- UPS inverter B/Static switch B trouble.

ACTION:-

- Inform HOD (C&I), HOD (Opn.) and Shift Charge Engineer.

- Check for any abnormalities in UPS charger room as well as battery room.

- After removal of fault take inverter back into service with the help of C&I Engineer.

Loss of 24 volt D.C. (5x200 MW Stage-I)

SOP, ACLOP, DCLOP, Speeder gear, valves etc on ATRS panel will not operate either on

auto or manual from ATRS panel. However DC LOP can be started from the direct on/off

switch on UCB. In the same way AC LOP can also be started from direct on/off switch in unit

number 1 & 3 (for other units the switch is being provided in shutdown).

NTPC/SINGRAULI

5

Loss of 24 volt D.C. (2x500 MW Stage-II)

Two Numbers (+)24V and two Numbers (-)24V battery chargers along with (+)24V battery

bank of 1500 AH & (-) 24V battery bank of 600 AH are provided to each 500MW Units.

Indication/Status

- Loss of + 24 volt D.C. Power supply fail alarm will appear on AN D 010 fascia window

- ATRS panel indication will not glow

- Turbine trip will not get actuated.

- Loss of excitation & GCB trip

- All controllers output of ATRS will become ZERO.

- Turbine control through ATRS will remain out.

ACTION:-

- Inform SCE.

- Take necessary action for early & safe shut down of unit.

- Run DC seal oil p/p from local.

- Run DC Lube oil p/p from local.

- Station one responsible person in the MOT room who will start JOP at TG speed < 500 rpm

on instruction of control engineer.

- Hand trip the turbine from local.

- Trip the generator breaker and boiler in case they do not trip on protection.

- Identify the fault and restore the system.

NOTE:-1. Do not take chance to run the unit on loss of 24V DC.

2. Try to take shut down of unit before 24V DC voltage falls to Zero.

NTPC/SINGRAULI

6

Switchyard DC Supply (For Protection & Control system) failure

There are two sets of Batteries for 400/132 KV Switch yard.

Main - 1 Batteries: 300AH/220 volts (110 cells) batteries

Main - 2 Batteries: 300AH/220 volts (110 cells) batteries

Both Main-I/Main-II remain in the service for Indication, Control, Protection and Emergency light in

control room, charger room, Compressor room and cable galleries.

Indication/status when 220 volts DC Supply Main 1 fails.

- DC Supply Failed annunciation will appear

- Trip coil 1 faulty flag on all 400 kV CB & trip coil faulty flag on all 132 kV panels will come

- 220V DC Voltmeter of DC1 mounted on top of 400 kV control panel and at float charger

panel will show Zero

- Indicating lamps of 400/132KV breakers and isolators will not glow in control room and in

yard local control panel.

- All breakers/Isolator ON or OFF status will remain same. However Ammeters will show

current

- Hand tripping operation of any feeder will not be possible.

- Protection tripping from DC1 will fail but from DC2 will remain in service for 400 kV feeders

- All protection tripping for 132 kV feeders will fail.

Indication/status when 220 volts DC Supply Main 2 fails.

- TC-2 Faulty annunciation will appear on 400 kV breakers

- 220V DC Voltmeter of DC 2 mounted on top of 400 kV control panel and at float charger

panel will show Zero

- Hand tripping as well as protection trip of feeders through DC 1 will be in service for all 400

kV panel as well as 132 kV panel

- Protection tripping from DC 2 will be out of service for 400 kV feeders.

Instructions when DC Supply Main 1 fails

- Change annunciation /supply to DC-2 at Bus section panel.

- If restoration of Main - 1 DC is not possible within 2 to 3 hours, decision to shut down by

initiating protection trip to be taken for 400KV feeders.

- No protection/tripping will be possible for 132KV feeders. However 132 kV will be dead after

tripping all 400 kV feeders.

NTPC/SINGRAULI

7

Instructions when DC Supply Main 2 fails

- Efforts for restoration of DC II supply to be taken up. If same is not possible within 5 to 6

hours decision to shut down through hand trip is to be taken for 400KV feeders.

- 132KV Feeders will be healthy and available for 132KV panels only DC-1 has been provided.

(For 132 kV panel DC-2 is also from same DC DB. This will be connected in due course).

Instructions when both DC Supply Main-1 & Main-2 fail simultaneously

- Efforts to be made to restore at least one of DC-1 or DC-II after which selective tripping can

be taken p as may be decided.

- Using a 220V DC + emergency source tripping of all units one by one can be initiated.

- In extreme cases, emergency trip provided on ABCBs, MOCBs and unit 4/5 Generator CBs

can be actuated to isolate units 1 to 5 Unit 6 & 7 having SF6 CB will not be possible to be

isolated.

- The lines can be got tripped from other end as required.

Switchyard 50 Volts PLCC DC supply failure

PLCC battery, 500 AH 50 volts (24cells) battery. In case of 50 volts PLCC D.C. Supply failure:

Indication/Status.

- Annunciation of Carriers protection fail will appear 50V DC Voltmeter reading : Zero volt

(on PLCC DCDB)

- PLCC will fail & there will be no speech communication from other stations.

- Protection system will fail though PLCC however on unit basis protection system will remain

in service there will be no tripping through PLCC i.e. No feeder tripping will take place in case

of tripping from other end.

Instructions

- Immediate action to be taken for normalization of D.C. supply to PLCC.

- Operator should rush to PLCC D.C.D.B. battery room / battery charger room to check if any

fire has taken place/fuses blown.

- At least portable battery charger/temporary supply should be taken in service with the help of

Electrical Maint.

NTPC/SINGRAULI

8

C.W. System D.C. Power Supply System

CW has two sets of 50 volt battery each having 24 cells and 1000 Ah capacity.

- 50 Volts DC supply have been used for all 6.6 kV & 0.4 kV breaker ON/OFF indication, their

control panel indication and their protection and control system.

- For relay panel/control panel.

- For emergency light in CW pump house and CW switchgear.

- For emergency closure of 2 x 500MW CW pump discharge valve.

Indications in case of DC supply failure.

- 50 Volts DC volt meter will show zero reading at DCDB

- None of the indicating lamps on 6.6KV CW buses, control panel of both CW pumps houses

as well as Relay panel in switchgear will glow.

- All pumps running status will remain same and pump running status can be known by their

ammeter reading. However for emergency trip operation breaker can be tripped through

mechanical trip at breaker.

- In stage-I, CW discharge valve status will remain same as it was prior to DC failure. The

valve operations should be done manually.

- In stage-II, CW discharge valve will close on DC supply failure, thus loss of DC supply is

detrimental to Stage-II CW pumps as pumps

INSTRUCTIONS:

On 6.6 kV buses DC selection is provided in Bus VT panel. On failure of DC, go to switch

board & put above selection from DC1 to DC 2 or vice versa

Condition 1: Only DC 1 fails

a) Put selector switch of DC at bus VT panels of 6.6KV to DC 2.

b) Put selector switch at Bus coupler of LTMCC stage-I to DC 2.

c) Transformer protection is out. Trip transformer from 132KV yard manually if

required. (For 6.6KV Bus A & Bus B only DC 1 is provided. Provision of DC2

through selector switch yet to be made available.)

d) Put off DC 1 and switch on DC 2 at dist board located at Auxiliary Pump house.

Try restoration of DC 1.

NTPC/SINGRAULI

9

Condition 2: Only DC 2 fails

a) Put selector switch of DC at bus VT panels of 6.6KV to DC 1.

b) Put selector switch at Bus coupler of LTMCC stage-I to DC 1.

c) Transformer protection is out. Trip transformer from 132KV yard manually if

required. (For 6.6KV Bus A & Bus B only DC 1 is provided. Provision of DC2

through selector switch yet to be made available.)

d) Put off DC 2 and switch on DC 1 at dist board located at Auxiliary Pump house.

Try restoration of DC 2

Condition 3: Both DC sources fail

a) Immediately trip 500MW CW pumps by tripping transformer C and D from 132 KV

switchyard Control room.

b) Stage-I will remain in operation without protection and control DC try restoration of at

least one DC. If not possible trip entire stage-I from 132KV C.R

(Loss of DC Supply is detrimental to 2X500MW CW Pumps because pumps will keep on

running on shut off head)

NTPC/ SINGRAULI UPS FAILURE (STAGE-1) ________

SAFE LANDING OF UNITS DUE IN CASE OF UPS FAILURE ( STAGE-I )

Date: 09/12/2004 Page No. 01 Revision No. 0

UNIT

HAPPENING DUE TO UPS FAILURE ACTION TO BE TAKEN

U #1 to 5 Alternate supply will come automatically

from USS-B through change over switch

in case of Inverter failure. But if auto

change over fails followings will happen:

Inform C&I Maintenances

to Restore back the

Inverter

BOILER SIDE:-

All scanners power supply fail and

MFR will act within 2sec.on Flame

Failure and Turbine & Generator will

trip.

HONV will remains at its last position

( * If any oil gun is in service then

HONV & HOTV will remains at its

last position )

( * If no oil gun in service then HOTV

will close )

ID Fan IGV will full open

FD Fan Blade pitch will full close

F W Hi range & Lo range control

valve will close

Hydra-step supply will be off ( No

Indication in UCB)

SADC will full open

R-37, S-102 and all Spray Control

valves Will close

Ensure Turbine & Gen

Trip

---------------

Close HOTV & HONV

Manual V/V

Ensure HOTV closing,

otherwise close HOTV

Manual V/V

Stop both ID & FD Fans

---------------

----------------

----------------

Ensure R-37, S-102

closed and close all

spray Manual Isolating

valves

U # 1to 5 Common :-

UCB indications, recorders will be off

DAS will fail including annunciation

-----------------

-----------------




UNIT HAPPENING DUE TO UPS FAILURE

ACTION TO BE TAKEN

U #1 to 5 Alternate supply will come automatically

from USS-B through change over switch

in case of Inverter failure. But if auto

change over fails followings will happen

:

Inform C&I Maintenances

to Restore back the

Inverter

TURBINE SIDE :-

ATRS supply will remain for at

least next six hours for U # 1,3 & 4

only because 24 Volts battery

back up provided ( U # 2 & 5 NO

battery back up ) But if battery

supply fails followings will

happen :-

Turbine motorized actuators in

ATRS will be in operative & will

remain in its last position

AC / DC LOP will not start from

ATRS

Starting Oil P/p will not start

PSW Conductivity hi-hi to UTR trip

will be out of service

Exp. Tank level lo lo- to PSW p/p trip

will be out of service

For U # 2 & 5 only PSW flow lo- lo to

UTR trip will be out of service

-------------------

-------------------

Start AC / DC LOP from

Panel and keep watch

L.O.Pr from local

Start AC / DC SOP and

keep watch S.O.Pr / Seal

oil DP / Thrust Oil Pr / H2

Pr from local

-----------------

-----------------

-----------------




UNIT

HAPPENING DUE TO UPS FAILURE ACTION TO BE TAKEN

U# 1to 5 TURBINE SIDE :-

BFP C will trip

Lead/ lag Auto starting for BFP &

CEP will not act.

MC-36 will full open and become

Inoperative

BFP-A & B Scoop will be

minimum and Recirculation will

full open.

( But DT Protection will be out

of

service and no indication will

be

available for Recirculation

valve )

CA-21,22 & MC-39,57 will remain

in its last position and become

Inoperative

HPBP Steam pr control valve

may open due to HPBP Oil P/p

failure by entrapped steam pr.

--------------

-----------------

Stop All CEPs and

Close

LPH-4 O/L Valve

Trip all BFPs

Open CA-21,22 from

MCC room

Close MS-1 & 5

PRIMARY WATER SYSTEM

PRIMARY WATER PUMPS 1 & 2SS11 D001/SS11 D002

KIND OF PUMPCENTRIFUGAL PUMP

TYPECPK Cm 65-250 (KSB)

SPEED47 S-1

CAPACITY19 dm3/s

DISCHARGE HEAD80 m

PUMP MOTOR TYPE1LA4207-2AA90 (SIEMENS)

RATING37 KW

VOLTAGE /FREQ415 ,3 PHSAE AC / 50 Hz

SPEED47 S-1



MAIN FILTERSS11 N531

KIND OF FILTERSTRAINER TYPE FILTER WITH MAGNETIC BARS

TYPE1.53.1 (Boll + Kirch)

VOLUMETRIC FLOW RATE25 dm3/s (max)

DEGREE OF FILTRATION150 microns

PRESSURE DROP ACROSS FILTER0.1 bar WITH CLEAN FILTER & 1.2 bar WITH 100% FOULING

NO.1 NO. FULL CAPACITY

FINE FILTER

KIND OF FILTER1 PLUG, 1 CARTRIDGE

TYPE1.55.1 (Boll + Kirch)

VOLUMETRIC FLOW RATE0.42 dm3/s (max)



ION EXCHANGERSS11 N520

VOLUME83 LITERS (BISCHOFF)

RESINLEWATIT

RESIN VOLUME56 LITERS (45 KG)

NO.1 FULL CAPACITY

SEAL OIL SYSEM

SEALOIL PUMP 1and 2, AIR SIDE

KIND OF PUMPSREW PUMP

TYPESNH 210-R46 (ALLWEILER)

CAPACITY3.3 dm3/s

DISCHARGE PRESSURE15 bar

PUMP MOTOR- TYPEILA3 133-4AA90 (SIEMENS)

RATING7.5 KW

VOLTAGE/FREQUENCY415V, 50 Hz

CURENT14.1 A

SPEED24.17 S-1



SEAL OIL PUMP 3 AIR SIDE (DC SOP)

KIND OF PUMPREW PUMP


CAPACITY3.3 dm3/s


PUMP MOTOR- TYPEIHA4165-5JL20 (SIEMENS)

RATING8.5 KW

VOLTAGE220 DC

CURENT51 A

SPEED24.17 S-1



SEAL OIL PUMP H2 SIDE

KIND OF PUMPSREW PUMP


CAPACITY2.17 dm3/s


PUMP MOTOR- TYPEILA3 133-6AA90 (SIEMENS)

RATING4 KW

VOLTAGE415V, 50 Hz

CURENT7.2 A

SPEED15.8 S-1



SEAL OIL FILTER UNIT, AIR SIDE & H2 SIDE

KIND OF FILTERSTRAINER TYPE FILTER

TYPE2.62.9 Ma (Boll + Kirch)

VOLUMETRIC FLOW RATE3.3 dm3/s

DEGREE OF FILTRATION100 microns


NO. OF AIR SIDE2 NO. FULL CAPACITY

NO. OF H2 SIDE2 NO. FULL CAPACITY

SPECIFICATION OF TRANSFORMERS

GENERATOR TRANSFORMER

MANUFACTURERBHEL

NO. OF UNITS3

RATING HV & LV (MVA)200 MVA

NO LOAD VOLTAGE, HV400 / 3 KV

NO LOAD VOLTAGE, LV21 / 3 KV

RATED CURRENT, HV866.0 Amp

RATED CURRENT, L9523.8 Amp

NO. OF PHASES1

FREQUENCY50 Hz

TYPE OF COOLINGFORCED OIL & FORCED WATER

CONNECTION SYMBOL WHEN FORMED A BANKYN 11

IMPEDANCE AT PRINCIPLE TAP15% MAX

ON LOAD TAP CHANGERTAPPING IN 12 EQUAL ATEPS OF 1.25% EACH PROVIDED ONHV WINDING TO GIVE (+) 10% TO (-) 5%

TEMPRATURE RISESVARIATION OF HIGH VOLTAGES

i) OIL BY THERMOMETER50 OC

ii) WINDING BY RESISTANCE60 OC

OTI & WTI, AUXILIARY CONTACTS SETTINGS

i) OTI ALARM85 OC

TRIP90 OC

ii) WTI ALARM105 OC

TRIP115 OC

STATION TRANSFORMER

MANUFACTURERNGEF

NO. OF UNITS2

CAPACITY20/35/50 MVA

VOLTAGE RATIO132/6.9/6.9 KV

VECTOR GROUPY/Yno/Yno

COOLINGFORCED OIL & FORCED AIR

UNIT AUXILIARY TRANSFORMER

MANUFACTURERNGEF

NO. OF UNITS4

CAPACITY25 MVA

VOLTAGE RATIO21/6.9 KV

VECTOR GROUPDYN

COOLINGNATURAL OIL & FORCED AIR

PERCENTAGE IMPEDANCE7.8%

CW TRNSFORMER

MANUFACTURERNGEF

NO. OF UNITS1

CAPACITY25 MVA

VOLTAGE RATIO132/6.9 KV

VECTOR GROUPY/Yn

COOLINGONAF

PERCENTAGE IMPEDANCE0.135 +/- 10%

ESP TRNSFORMER

NO. OF UNITS4

CAPACITY2000 KVA

VOLTAGE RATIO6.6 KV / 0.433 KV

VECTOR GROUPDYn1

ASH SLURRY TRNSFORMER

NO. OF UNITS3

CAPACITY1600 KVA

VOLTAGE RATIO6.6 KV / 433 V


STATION SERVICE TRNSFORMER

NO. OF UNITS4

CAPACITY1600 KVA


VECTOR GROUPDYO1


WTP SERVICE TRNSFORMER

NO. OF UNITS2

CAPACITY1000 KVA


VECTOR GROUPDYO1


CHP TRNSFORMER

NO. OF UNITS4

CAPACITY1600 KVA

VOLTAGE RATIO6.6 KV / 433 V

UNIT SERVICE TRNSFORMER

NO. OF UNITS4

CAPACITY1600 KVA


VECTOR GROUPDY1


CW PUMP HOUSE SERVICE TRNSFORMER

NO. OF UNITS2

CAPACITY630 KVA


VECTOR GROUPDYn1


VOLTAGE REGULATING SYSTEM

TYPETHYRISIAM 04-2

MAX OUTPUT VOLTAGE250 V

OUTPUT CURRENT FOR FIELD FORCING152 A

OUTPUT CURRENT FOR RATED GENERATOR LOAD88 A

AUXILIARY VOLTAGES FROM PILOT EXCITER FOR THYRISTOR SETSTHREE PHASE SUPPLY, 220 V, 400 Hz

DC VOLTAGE FROM STATION BATTERY FOR CONTACTORS & DRIVES220 V

POWER INPUT CONTINUOUSLY< 0.1 KW

POWER INPUT, SHORT TIME< 1 KW

DC VOLTAGE FROM STATION BATTERY FOR 2 X 24 V FOR CONTROL & REGULATIONMAX. 15 A POSITIVE

MAX. 6 A NEGATIVE

RATED SECONDARY VOLTAGE120 V

POWER INPUT OF VOLTAGE TRANFORMER PER PHASE2 VA

RATED SECONDARY CURRENT5 A

POWER INPUT OF CURRENT TRANFORMER PER PHASE6.5 VA (PLUS LOSSES IN CONNECTING LEADS)

ACCURACY OF CONTROLBETTER THAN +/- 0.5%

SETING RANGE OF VOLTAGE SET POINT POTENTIO METER+5% - 15% OF NOMINAL GENERATOE VOLTAGE

SETTING RANGE OF DROOP COMPENSATION OR COMPOUNDIND+/- 0-10% DEPENDANT ON THE SETTING OF POTENTIO METER & PROPOTIONAL TO REACTIVE CURRENT (direction of reactive current compensation depend on the phase relation which is determined by connection of CTs to TVR terminals.

TORQUE, CRITICAL SPEEDS

MAX SHORT CIRCUIT TORQUE OF STATOR AT LINE TO LINE SINGLE PHASE SHORT CIRCUIT1488 kpm

MOMENT OF INERTIA OF GENERATOR SHAFT10,000 Kgm2

CRITICAL SPEED (CALCULATED)

nk114.4 S-1 (V-GEN)

nk230.1 S-1 (V-EXC)

nk339.8 S-1 (S-GEN)

GENERATOR VOLUME & FILLING QUANTITIES

GENERATOR VOLUME (GAS VOLUME)80 M3

CO2 FILLING QUANTITY160 M3

H2 FILLING QUANTITY520 M3

WASTE GAS SYSTEM

BEARING VAPOUR EXHAUSTER

TYPE4036 Mx 80112 (ANTON PILLER KG)

MOTOREm 80-2

RATING0.75 KW

VOLTAGE /FREQ415 / 50 Hz

CURRENT1.65 Amp

SPEED49 S-1


TYPE OF EXHAUSTERSRADIAL FLOW

VOLUMETRIC FLOW RATE380 m3/h AT 10 m BAR


Documents

Cooler Data