ROHIT VIJAY

8/6/2019 ROHIT VIJAY

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SUBMITTED BY: GUIDED BY:

ROHIT VIJAY Mrs. SUMAN PURI

(B.TECH, VII SEMESTER) Head of the department

FINAL YEAR Department of

Electrical Engg.


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The KOTA SUPER THERMEL POWER STATION isideally located on the left bank of Chambal River at theupstream of KOTA BARRAGE

Total Generation Capacity 1240 MW

Stage I (Two units each of 110 MW)Stage II (Two units each of 210 MW)

Stage III (One unit of 210 MW)Stage IV (One unit of 195 MW)Stage V (One unit of 195 MW)


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Water availabilityin large amount.

Concentration of load in region.

Continue power supply.

Coal availability.

Central grid location.


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Generator

Transformer

Motor

Coal Handling PlantAsh Handling Plant

Water Treatment Plant

Switch Gear

Switch YardSwitch Yard

ProtectionProtection

Auxiliary SupplyAuxiliary Supply

Control RoomControl Room

TurbineTurbine

BoilerBoiler

ElectroElectro--StaticStatic

PrecipitatorPrecipitator


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Switchgear Employed for the protection of Inductionmotor.

Generally two basic protectionviz short circuitprotection and overload protection are provided foreach motor.

The Switchgear used for protection includes

contractors with H.R.C. fuse and thermal overloadrelays along with CB.


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1) PHASE TO PHASE FAULT

2) EARTH FAULT

3) INTER-TURN FAULT

1) CONDUCTOR TO EARTH FAULT

2) BEARING FAILURE

3) FAULT IN STARTER & ASSOCIATED CIRCUITS


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y OVERLOADING

y STALLINGy UNBALANCE SUPPLY VOLTAGES

y SINGLE PHASING

y

UNDER VOLTAGEy REVERSE PHASE


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Earth leakage Core balance CT and

Relay

Earth fault Earth Return CT

Unbalance 3Phase CT and Relay

Overload Thermal overload relay

Over current IDMT Relay

Stalling Motor protection relay

Short circuit Instantaneous relays

Fuses

Differential Basically for earth fault

within a particular zone.

CT on both sides

Under Voltage UV Relay

Over Voltage Over Voltage Relay

Unbalance Single Phase Preventers

Single Phasing


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y It is used below 1000v.

y Three phase supplyis given to the motor throughvarious elementssuch as fuse, Switch,contactor &thermal overload relay.

y

Magnetic contactor

starter con

sist of a

set of

start an

dstop push buttons with associated contacts.


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This method to provide earth fault protection is calledcore balance type protection.

It is also calledzero sequence current transformer.

It is preferred the system with neutral earthed wiresystem.


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It is based on the electromagnetic principle.

Rev

erse pha

se protect

ion mu

st be pro

vide

dinElevators , cranes, trams etc.

Now a dayssolidstate phase reversal relaysensing thephase reversal is used.


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