Tag: 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 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...
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...
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...
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...
7 Purpose of NGR Neutral Grounding Resistor Transformer & Generator
Why NGR Neutral Grounding Resistor are used.
The Short form of NGR is Neutral Grounding Resistor. NGRs are used in an electrical power system to...
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 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...
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 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...
What is Relay Coordination
What is relay coordination:
The relay co-ordination is nothing but a tripping of protecting relay in a sequence or order in electrical power system. Relay...
Neutral Displacement Relay Operation- 59N
Neutral displacement relay:
Neutral Displacement relay is a short form of NDR. Neutral displacement relay is used to protect the transformer against earth fault in...
Open Delta & Broken Delta Configuration
What is Open delta:
Two single phase voltage transformer uses in this configuration. The transformer’s one end is connected with the another end of the...
Voltage Restrained Over Current relay Basic concept -51VR VOC
Voltage restrained Over Current relays:
The overcurrent relay is nothing but a relay operates when the current reaches the pickup value. The overcurrent relay is...
Tan-Delta Test – Finding Insulation Ageing Loss Angle Test
Tan Delta Test:
Tan Delta testing creates the idea about the insulation ageing or healthiness of the insulation and predict the remaining life of an...
What is The Use Of Knee Point Voltage
Knee point voltage:
Knee point voltage is nothing but a magnitude of the saturation limit of the current transformer. Each protection class CT has to...
6 Types of Over Current Relay Used in Power System Protection
Types of Over Current Relay:
Over current relay is nothing but a relay element which operates when the current exceeds the pre-set value. The relay...
Contact Multiplier Relay Working Function & Wiring diagram
Contactor Multiplier relay:
Contact multiplier relay use or increase the number of contact from any circuits. It just converts single contact into N number of...
Anti-Pumping relay diagram and Working Function Explanation
Anti-Pumping relay diagram and Working Function Explanation
Already we have discussed about Trip Circuits Supervision relay in earlier. Another two important basic operating relays are...
Trip Circuit Supervision TCS Relay Working Function and Operation
Trip Circuit Supervision Relay Working Function:
Trip circuit supervision relays are used to monitor the trip coil of the circuit breaker. It just checks the...
