generator protection
TRANSCRIPT
GENERATOR GENERATOR PROTECTIONPROTECTION
Presented ByPresented By
JOYOTOSH KUMAR JOYOTOSH KUMAR DEYDEY
Sr. Superintendent (Operation)
BTPS
NTPC Limited
Classification of Generator Classification of Generator protectionsprotections
Class – A ProtectionsClass – A Protections
Class – B ProtectionsClass – B Protections
Integrated ProtectionsIntegrated Protections
Boiler Lockout
Turbine Trip Relay
Generator Lockout
TLR
86Y86T
86GT 86B
86GFCB
Contact 2/3
72/32
Protection Against Protection Against Insulation FailureInsulation Failure
Differential ProtectionDifferential Protection Inter-turn Fault Protection Inter-turn Fault Protection Stator Earth Fault Stator Earth Fault
ProtectionProtection Rotor Earth faultRotor Earth fault
Differential ProtectionDifferential Protection
Relay Coil
CT-1 CT-2
Direction of Power Flow
Equipment to be protected
Protection Against Protection Against Insulation FailureInsulation Failure
Differential ProtectionDifferential Protection Generator Differential (87 G)Generator Differential (87 G) Transformer Differential (87 T)Transformer Differential (87 T) Restricted Earth Fault (87 REF)Restricted Earth Fault (87 REF) UAT Differential (87 UTA & 87 UTB)UAT Differential (87 UTA & 87 UTB) Over Head Line Differential (87 L)Over Head Line Differential (87 L) Overall Differential (87 GT)Overall Differential (87 GT)
Transformer REF ProtectionTransformer REF Protection
XER
REF
Back-Up Earth fault
CT’s
Protection Against Protection Against Insulation FailureInsulation Failure
Differential ProtectionDifferential Protection Inter-turn Fault Protection Inter-turn Fault Protection Stator Earth Fault Stator Earth Fault
ProtectionProtection Rotor Earth faultRotor Earth fault
Protection Against Protection Against Insulation FailureInsulation Failure
Stator Earth Fault Stator Earth Fault ProtectionProtection 80% Earth Fault Protections80% Earth Fault Protections 100% Earth Fault Protection100% Earth Fault Protection
Protection Against Protection Against Insulation FailureInsulation Failure
Differential ProtectionDifferential Protection Inter-turn Fault Protection Inter-turn Fault Protection Stator Earth Fault Stator Earth Fault
ProtectionProtection Rotor Earth faultRotor Earth fault
There Occurs a fault, There Occurs a fault, then the current should halt.then the current should halt.
Otherwise the fault current would increase,Otherwise the fault current would increase,and the service continuity decrease.and the service continuity decrease.
But the relay acts Quick, But the relay acts Quick, and the circuit breaker tripsand the circuit breaker trips
The Faulty part is disconnected,The Faulty part is disconnected,and the power system is protected.and the power system is protected.
Thank you Mr. Switchgear,Thank you Mr. Switchgear,because of you there is little fear.because of you there is little fear.