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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...

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...

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...

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...
Under Voltage protection

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...
What is Reverse Power protection

Reverse Power Protection Working Principle -32R

Reverse Power Protection Working Principle 32R: Reverse power protection is the most Predominate protection in generator/alternator protection. It is used to protect the alternator/generator from...
Negative sequence relay

Negative Sequence Relay Operation 59_2

Negative Sequence Relay: Negative Sequence Relay is used to protect the alternator/generator from unbalance loading and negative sequence component. The negative sequence current flows in...
stator earth fault relay 59GN 27TN

100% Stator Earth Fault Protection of Generator

100% stator Earth Fault protection: Stator is a stationary winding of generator. It is a heart of the generator. To protect the stator, we have...
Netural overvoltage protection

Neutral Voltage Protection -59GN- 95% stator Earth fault protection

Neutral Voltage Protection -59GN: Neutral Voltage Protection is used to protect the alternator/generator stator winding from stator earth fault. Most commonly, the generator’s neutral point...
Neutral Grounding Transformer

Advantage of Neutral Grounding Transformer NGT

Advantage of Neutral Grounding Transformer NGT? Neutral grounding transformers are a single phase transformer which is used to protect the generator/alternator winding from damaging short...
Over frequency relay operation

Over Frequency Protection Working Principle -81O

Over Frequency Protection: Over frequency protection or over speed protection is used to protect the generator from over speeding of generator’s rotor, reduce the eddy...
Local Breaker Back Protection LBB 50Z or 50BF

Local Breaker Backup Protection LBB 50Z or 50BF

Local Breaker Backup Protection LBB 50Z or 50BF: Local Breaker Backup Protection is used to protect the generator when the generator’s circuit breaker failed to...
Low Forward Power protection

Low Forward Power Protection 32F

Low Forward Power Protection 32F: Low forward Power protection occurs when the generator is not able to produce the minimum output power. Typically, the generator...
Generator Over Fluxing or Over Excitation Protection

Generator Over Fluxing or Over Excitation Protection 24 G

Over Fluxing or Over Excitation Protection 24 G. Over Fluxing relay is used to protect the generator against overheating and the winding insulation failure. Over...
Pole Slip relay

Pole Slip Protection Out of Step Protection 78PS Working Principle

Pole Slip protection or out of step Protection 78PS: Pole Slip protection: Under normal condition the generator is synchronized with grid. But during some extreme...

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