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Difference Between IDMT DT and Instantaneous Relays

Difference between IDMT DT and Instantaneous relays: Generally, the over current relays are differentiating with their time of operation. The most commonly used over current...

Partial Differential Protection | Scheme | Working Principle

What is Partial Differential Protection: Partial differential protection is used to protect the bus bar from over loading, provide the backup protection for main bus...

Vector Surge Relay Working Principle | Main Decoupling Relay | MRN Relay

Vector Surge Relay Working Principle: Vector surge relay is used to protect the transformer/generator/alternator from grid disturbance such as grid failure, grid interruption, vector surge...

Motor Protection Relay MPR Relay Working Principle Higher HP & High Voltage Motor

Motor Protection Relay MPR Relay Working Principle: Motor Protection relays are used to protect the higher HP high voltage induction motor. When we increase the...

Merz Price Differential Protection for Transformer

Merz Price Differential Protection for Transformer: Merz price differential protection is used to protect the transformer from internal short circuit, Internal ground faults and inter...

Difference Between Inter Turn Short And Internal Short

Difference between inter turn short and internal short? Electrical machine consists of copper winding and they will be insulated and wound in a core. The...

Single Phase Preventer Working Principle | Induction Motor Protection

Single Phase Preventer Working Principle: Single phase preventer is used to protect the induction motor from single phasing fault. Single phasing is a very dangerous...

Current Based Relay | Voltage Based Relay

Current based relay | Voltage based relay: Current based relay: Current based relay is nothing but an operating element or relay coil is designed to operate...

Phase Reversal Protection | Induction Motor Protection

Phase Reversal Protection | Induction Motor Protection: Phase reversal protection is used to protect the induction motor, from running in reverse direction. Normally running a...

Phase Fault Protection | Induction Motor Protection

Phase Fault Protection | Induction Motor protection Phase fault protection is nothing but an attracted armature type relay unit is connected in each phase current...

ELCB Earth Leakage Circuit Breaker Working Principle

ELCB Earth Leakage Circuit Breaker| Ground Fault Protection on Induction Motor: The ground fault protection is used to protect the induction motor from ground fault...

Difference between Surge Arrester, Lightning Arrester and Lightning Rod

Difference between Surge Arrester, Lightning Arrester and Lightning Rod: Surge arrester is used to protect the circuit or electrical equipment from high voltage transient or...

Check Synchronous Relay Working Principle SKE Relay ANSI Code 25

Check Synchronous Relay Working Principle: Check Synchronous Relay is used to protect the generator from mismatched synchronization. Mismatched synchronous leads to flow heavy circulating current...

Distance Protection Working Principle & Fault Location Detection

Distance Protection Relays Working Principle: In last study we have discussed about only current or voltage based relay. Now we are going to discuss about...

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....

Plug Setting Multiplier & Time Setting Multiplier

Plug Setting Multiplier & Time setting Multiplier Calculation: Plug setting multiplier is nothing but a ratio between the actual fault current in the relay operating...

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...
Under frequency protection

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

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...
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 displacement relay operation

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...
voltage restrained over current relay concept

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...

Standby Earth Fault Relay Operation 51N

What is Standby Earth Fault Relay: In electrical power system, the fault occurs due to the various factor such as natural disturbance, lightning on the...

Protective Relaying Terminologies Definition

Protective Relaying Terminologies Definition: The various terminologies used in the protective relaying are, Protective Relay Relay Time Breaker Time Pickup Pickup Value Dropout or Reset ...

Zone of Protection System

Zone of Protection System: All the electrical power system works under zone protection and which can be divided in to several zones of protection. Each...

What is Fault in Electrical Power System

What is Fault in the Electrical power system: In an electric power system, a fault or fault current is nothing but a any abnormal electric...

High Impedance Differential Protection Low Impedance Differential Protection

What is high impedance differential protection and Low Impedance differential protection: Generally, you can configure your differential protection in two ways, according to the connection,...

How to Calculate Stabilizing Resistor for High Impedance Differential Protection

Calculate stabilizing resistor for Differential Protection: In three phase alternating power system, the bus bar differential protection needs to be stabilized, because of the differential...
Moving Contact

How To Make A Electrical Starter and Power Circuit

Power circuit: Power circuit is nothing but, distribution of power to the motor through a certain equipment like MCCB/MPCB/SFU, contactor, protection relay, Power cable, Connector...

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