DEVU ppt on generator protection
Transcript of DEVU ppt on generator protection
SUBMITTED BY: GUIDED BY: DEVESH KUMAR BAGHEL Mrs. SUMAN PURI (B.TECH, VII SEMESTER) Head of the department FINAL YEAR Department of Electrical Engg ELECTRICAL ENGG. DEPTT.
KOTA SUPER THERMAL POWER PLANT IS A COAL BASED
STEAM POWER PLANT
IT IS LOCATED ON THE LEFT BANK OF RIVER CHAMBEL.
TOTAL GENERATION CAPACITY IS 1240MW.
CENTRAL ELECTRICAL AUTHORITY WAS PREPARED THE
PROJECT OF THIS PLANT IN APRIL,1973.
INTRODUCTION
GENERATION CAPACITYGENERATION CAPACITY
1.Turbine1.Turbine
2.Generator 3.Transformer
4.Coal Handling Plant
5.Ash Handling Plant
6.Electro-Static Precipitator6.Electro-Static Precipitator
7.Water Treatment Plant
8.Feed water plant
9.Condenser
10.Primary Air fan
11.Induced draft fan
12.Forced draft fan
13.chimney
EQUIPMENTS FOR STEAM GENERATION
BOILERECONOMISERSUPERHEATERFURNANCEAIR-PREHEATERREHEATER
The "Wild"PowerSystem
G
Exciter
Loss of FieldLoss of Field
Overexcitation
Overexcitation
Overexcitation
OpenCircuits
Loss ofSynchronism
InadvertentEnergizing,Pole Flashover
AbnormalFrequency
AbnormalFrequency
BreakerFailure
ReversePower
OverPower
• Percentage differential protection.• Protection against stator inter-turn faults.• Stator-overheating protection.
• Field ground-fault protection.• Loss of excitation protection.• Protection against rotor overheating because
of unbalanced three-phase stator currents.
• Overvoltage protection
• Overspeed protection
• Protection against motoring
• Protection against vibration
• Bearing-overheating protection
• Protection against auxiliary failure
• Protection against voltage regulator failure
• This protection is used for generators above 1 MW rating.
• It is used to protect against winding faults.
• It do not works fort external faults and overloads.
• Generator and transformer is considered as a single unit .
• percentage differential protection is applied for combined unit.
• Harmonic restrain is not provided in transformer.
Overheating of stator is caused by failure of cooling system, overloading or core faults.
Two methods are used for detection of overheating:-
1.By compairing the inlet & outlet temperature of cooling medium.
2.By using temperature sensing elements.
• The field winding on rotor is ungrounded then operation of generator does not affected during single ground fault.
• The incidence of second fault would cause serious damage.
• The unbalanced condition may arise due to following reasons:-
1.When a fault occurs in the stator winding.
2.An unbalanced external fault which is not cleared quickly.
3.Open-circuiting of a phase.
4.Failure of one contact of the circuit breaker.