Describe working of protective relays and circuit breaker with neat circuit diagram.

Protective relays and circuit breakers play a crucial role in safeguarding electrical systems from faults such as short circuits, overloads, and earth faults. These devices work in conjunction to ensure the safety, stability, and reliability of electrical networks.

Working of Protective Relays

A protective relay is a device that detects abnormal conditions within an electrical circuit and initiates a corrective action, usually by tripping the circuit breaker. The relay operates based on specific parameters, such as voltage, current, frequency, or other operational characteristics. When these parameters exceed or fall below the predetermined limits, the relay activates and sends a signal to the circuit breaker to isolate the faulted section.

There are several types of relays, including electromagnetic, static, and microprocessor-based relays, with each having specific advantages and applications. However, the general working principle remains the same—monitoring the circuit for abnormalities and responding accordingly.

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