Relay can be Designed to Respond to Change in

A protective relay is a relay device used in electrical engineering that trips a circuit breaker when a fault is found. To offer detection of abnormal operating circumstances including over-current, over-voltage, reverse power flow, over-frequency, and under-frequency, the original protective relays were electromagnetic devices that relied on coils acting on moving elements.

Answer - Relay can be designed to respond to change in resistance, reactance or impedance, voltage and current, light intensity, and temperature.

These days, digital protection relays powered by microprocessors provide protection and supervision in ways that are unfeasible for electromechanical relays. Relays that are electromechanical only give basic information about the location and cause of faults. A single microprocessor relay frequently performs tasks that need two or more electromechanical devices.

Numerical relays, as opposed to electromechanical relays, save capital and maintenance costs by merging several functionalities into one instance. However, hundreds of these "silent sentinels" are still guarding electrical equipment and transmission lines all over the world because of their incredibly long lifespan. With numerous discrete electromechanical devices or one or two microprocessor relays, important transmission lines and generators have protection-specific cubicles.

Summary: 

Relay can be Designed to Respond to Change in

Relay can be designed to respond to changes in resistance, reactance or impedance, voltage and current, light intensity, and temperature.

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