Industrial Power Distribution in Nuclear Fuel Complex

8/9/2019 Industrial Power Distribution in Nuclear Fuel Complex

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INDUSTRIAL POWER

DISTRIBUTION IN

NUCLEAR FUEL COMPLEX


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ABSTRACT

NFC is one of the unique organizations in

ASIA, for supplying enriched uranium and

zirconium to Nuclear power plants. This project involves Power distribution in

NFC and power factor control in NFC and

introduction to FACTS-an advanced system

which overcomes the various demerits inconventional A.C. transmission system.


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CLASSIFICATION OF POWER SUPPLIES

BASED ON RELIABILITY POINT OF VIEW

->>CLASS-1

->>CLASS-2->>CLASS-3

->>CLASS-4

DISTRIBUTION SYSTEMS employing in NFC:

->>Radial system

->>Ring main system


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SUPPLY SYSTEM


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DISTRIBUTION SYSTEM IN N.F.C


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In N.F.C we have 6 Substations Namely M.S.D.S.-1

M.S.D.S.-2

C.P.A

Z.F.P

NUOFP

NUFAP

In NFC we are using 2 types of cables.

XLPE-Cross linked poly ethane.

PILCA-Paper insulated lead coveredaluminum.


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M.S.D.S-1 (132KV Substation):Bus coupler ( works as CHANGEOVER switch).

Standby facility.

M.S.D.S-2 (33Kv Substation):

Bus coupler and Standby facility.

C.P.A(11Kv Substation):

11KV Will be stepped down to 415V to distribute various

loads such as Pump house-2 and Services plant.

Z.F.P(11KV Substation):11kv will be fed to load centers 1 & 2 and 11kv will be

stepped down to 6.6kv to feed ZFP 6.6Kv substation.


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MAIN STEP DOWN SUBSTATION-1


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31.5MVA 132/33/11KV YNynoyno Transformer.

Why we are using YNynoyno transformer?

Demerit of star-star connected transformers.

OLTC Facility ON H.V. Side with 21 tap settings.

Why we are not using OLTC facility on L.V. side? Achieving reliable Standby system:


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In M.S.D.S.-1 we use earth switches for man and

machine protection. We are using SF6 G.C.B in M.S.D.S.-1.

Why we are not using V.C.B in M.S.D.S.-1.?

Ratings of G.C.B:

SF6 gas pressure =5.3 kg/cm2

Air pressure =14.5 kg/cm2

Current value =3150Amps on 132KV

Voltage =145KV

Lockout pressure =4.2 kg/cm2

120kv Expulsion type lightning Arrester at Main T/F.

Why we are not using Arrester at starting of incomingfeeders.?


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In M.S.D.S.-1 we are using 2.7MVAR capacitor bank

for that we are using restricted earth fault

protection.

TRANSFORMER PROTECTION:

1. Differential protection relay ( 5A)2. Over current relay (inverse type)

3. Definite time over current relay (2.5A,1Sec)

4. Restricted earth fault relay (64R)

5. Earth fault relay (51)6. Buchholz relay (Incipient and major faults)

7. Temperature relay (49)

8. Frequency relay (81)

9. Explosion vent (Diaphragm)


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11KV FEEDERS FROM MSDS1

C.P.A.-1

C.P.A.-2

Z.F.P.-1

Z.F.P.-2

H.C.1

H.C.2

NUFAP-1NUFAP-2

NUOFP-1

NUOFP-2


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CAPTIVE POWER GENERATION PLANT

N.F.C. obtains most of its production during generalshift hours (09:00Hrs to 17:00Hrs).

M.D. is 12MVA.

captive power generation capacity is 7.5MVA,

consisting of 3 DG sets, each of 2.5MVA capacity.

-> Voltage :11000volts

-> Current :131amps

-> KVA :2500-> Excitation :80volts, 4.0Amps

EMERGENCY TRANSFER


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PROTECTION SYSTEMS EMPLOYED FOR CPGP

Under voltage relay(27) Over voltage relay

Instantaneous under voltage relay

Auxiliary relay

Definite time relay

Earth fault relay

Field Failure relay

Definite time reverse power relay

Over current relay (inverse)

Negative phase sequence relay


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MAIN STEP DOWN SUBSTATION-2


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LOADS CONNECTED TO MSDS2:->>ZFP link-1, ZFP link-2

->>pilger mills

->>Load centers-2,4

->>Annealing furnace No.1

->>Horizontal furnaces->>New arc melting furnace, Vertical furnace

PROTECTION SYSTEMS EMPLOYED IN MSDS2:->>Over current relay

->>Differential relay

->>Instantaneous earth fault relay


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POWER FACTOR

What is power factor?

Why its controlling is Needed?

KVA=KW/Cos

Disadvantages of Low power factor:

->>Large KVA rating of equipment

->>Greater Conductor Size

->>Large Copper Losses

->>Poor Voltage Regulation


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POWER FACTOR CONTROL IN N.F.C

We are maintaining power factor value 0.98

to 0.99 by using centralized capacitor banks

at MSDS-1 and MSDS-2.

Why Centralized Capacitor Banks.?

In MSDS-1 we are using capacitor bank of

capacity 2.7MVAR but we are utilizing only

1.8MVAR as per the requirement. In MSDS2 we are using capacitor bank of

capacity 1.8MVAR.


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FACTS

Demerits involved in conventional A.C.

transmission system:

->>Loop flows

->>Parallel flows

->>Ferranti Effect

Definition of FACTS:

Types of compensations:->>Series compensation

->>Shunt compensation

->>Static VAR compensators


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CONCLUSION

This project involves study of power distribution

in Nuclear fuel complex and protection and proper

utilization of various classes of power supplies.

Power factor control equipment installed in N.F.C.

Demerits in conventional A.C. transmission andintroduction of FACTS.


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THANK YOU


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QUERIES.?

Documents

Industrial Power Distribution in Nuclear Fuel Complex