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Recovery Voltage

Recovery Voltage: Recovery Voltage - While closing or opening the circuit breaker, the circuit constants play an important role. It was noticed in practice a circuit breaker that would operate…

Static Distance Protection Relay

Static Distance Protection Relay: Static Distance Protection Relay are characterized by having two input quantities respectively proportional to the voltage and current at a particular point in the power system,…

Differential Protection Relay in Power System

Differential Protection Relay in Power System: A Differential Protection Relay in Power System scheme compares quantities derived from the input and output currents of the protected circuit in such a…

Overcurrent Protection Relay in Power System

Overcurrent Protection Relay in Power System: The technique of Overcurrent Protection Relay in Power System is still widely used as a means of detecting faults on distribution system and on…

Electronic Relays

Electronic Relays: Electronic Relays - These were the first to be developed in the series of static relays. They date back to early 1928 when Fitzgerald presented a carrier current…

Static Relays Basics and Classification

Static Relays Basics and Classification: A Static Relays Basics refers to a relay in which the measurement or comparison of electrical quantities is done in a static network which is…

Classification of Relay Testing

Classification of Relay Testing: Classification of Relay Testing are usually conducted to demonstrate that: the relay will operate correctly to clear a fault; and the relay will remain inoperative on…

Phase Comparison Carrier Protection

Phase Comparison Carrier Protection: The phase comparison pilot-relaying operates on the principle of comparing the phase position of the currents at the two ends of the protected section. The Phase…