Tag: Protection
Busbar Protection & Frame Leakage Protection Working Principle
Bus bar Protection:
The busbars are an important power distribution part in the power system. They are built inside of the panel with safe condition....
Bus Bar Differential Protection or Circulating Current Protection
Bus bar Differential protection or Circulating Current Protection
Bus bar Differential protection or Circulating Current Protection is working under the principle of differential protection. The...
Classification Generator tripping Scheme Class A, Class B & Class C
Classification Generator tripping Scheme Class A, Class B & Class A:
The generator Tripping classified according to the fault.
Protection of the generator:
Voltage Controlled Over...
What is Through Fault
What is Through Faults:
Through fault is nothing but a fault which occurs outside of the protective zone or in simple words the external fault...
Directional Over Current & Non Directional Over Current Protection Working Principle
Directional Over Current & Non Directional Over Current Protection Working Principle:
Directional Earth Fault Relay is used to protect the transformer/generator/alternator from over current fault....
Unit Auxiliary Transformer (UAT) Differential Protection 87UAT
Unit Auxiliary Transformer (UAT) Differential Protection:
Unit Auxiliary Transformer (UAT) differential protection is used to protect the generator and transformer’s winding internal short circuit, inter...
Rate Of Change Of Frequency (ROCOF) Protection df/dt Working Principle
Rate Of Change Of Frequency (ROCOF) Protection df/dt working Principle:
Rate Of Change Of Protection is used for load shedding in situations where sudden loss...
Dead Machine Protection Working Principle – 94G ANSI Code
Dead machine Protection Working Principle -94G ANSI Code
Dead machine protection is used to protect the generator or alternator from accidental circuit breaker closing when...
Lockout Relay Working Function 86
Lockout Relay Working Function 86:
Lockout relays are nothing but a manual reset relays, which ensure the fault has been cleared or inspected correctly. Lockout...
Rotating Diode Failure Relay Working Principle
Rotating Diode Failure Relay Working Principle?
The diode failure relay is used to protect the alternator’s automatic voltage regulator from severe damage against the rotating...
PT Fuse Failure Relay Working Principle VTFF
PT Fuse Failure Relay Working Principle VTFF:
PT Fuse Failure Relay VTFF is used to sense the PT fuses healthiness. Generally, In high voltage power...
Generator and Transformer Unit Biased Differential Protection
Generator and Transformer Unit Biased Differential Protection:
In a high voltage transmission system, the bus bars are at very high voltages than the generators. The...
Merz Price Differential Protection for Generators
Biased Differential scheme (Merz-Price Scheme) for protection of Generators:
This is most commonly used protection scheme for the alternator stator windings. The scheme is also...
Unrestricted Earth Fault Protection Working Priciple
Unrestricted earth fault relay:
The unrestricted earth fault protection is used to protect the alternator winding from internal earth fault. It uses a residual connected...
Loss of Excitation Protection Working Principle – 40
Loss of Field or Loss of Excitation Protection:
Loss of excitation protection is used to protect the synchronous machine (alternator or generator) acts as induction...
Pole Discrepancy Protection Working Principle – 52 PD
Pole Discrepancy Protection Working Principle:
Pole discrepancy protection is used to protect the generator/alternator from single phasing when the circuit breaker is failured to close...
Backup impedance Protection Working Principle (21G)
Backup impedance Protection Working Principle (21G)
The Backup Impedance Protection is used to protect the generator from supplying the over loaded or faulty system and it...
Under Frequency Protection Working Principle – 87U
Under Frequency Protection Working Principle:
Under Frequency Protection is used to protect the transformer/generator/alternator when the frequency drops below the operating frequency. It is a...
Under Voltage Protection Working Principle 27
Under Voltage Protection Working Principle 27:
Under voltage fault protection is used to protect the alternator/generator/transformer winding from low voltage operation. Under voltage protection sense...
Over Voltage Protection Working Principle 59
Over Voltage protection 59:
Over voltage protection is used to protect the synchronous Generator/transformer/alternator form high voltage. Generally, overvoltage occurs due to sudden load through...
