rohit vijay
TRANSCRIPT
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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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