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Feb 24, 2012 · Types of Protective Relays: Protective relays are categorized by their mechanism (electromagnetic, static, mechanical) and function (time-based, current, voltage). Operating Principles: Protective relays operate by detecting abnormal signals, with specific pickup and reset levels to start or stop their action.
A protective relay is an electrical component that is designed to trip a circuit breaker when a fault is encountered or identified.
In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected.
A protective relay is used to protect the device once the fault is detected within a system. Once the fault is detected, the fault location is found and then provides the tripping signal to the circuit breaker or CB. These relays work on the two principles like electromagnetic attraction & electromagnetic induction.
Protective relays and devices have been developed over 100 years ago to provide “last line” of defense for the electrical systems. They are intended to quickly identify a fault and isolate it so the balance of the system continue to run under normal conditions.
Protective relays: an expanded definition - An electric device that is designed to respond to input conditions in a prescribed manner and, after specified conditions are met, to cause contact operation or similar abrupt change in associated electric control circuits.
What are Protective Relays, or Protection Relays? Protective relays are used in industrial power generation and supply systems to open and isolate branch circuits in the case of excessive current. They are activated by means which are not dependent on a continual AC supply.
