1. The task of relay protection
In order to ensure the safe operation of the power supply and distribution system and avoid the impact of overcurrent caused by overload and short circuit on the system, different types of overcurrent protection devices should be installed in the power supply and distribution system. Commonly used over-current protection devices include fuse protection, low-voltage circuit breaker protection and latching relay protection. Among them, relay protection is widely used in high-voltage power supply and distribution systems. It has many protection functions and is the basis for realizing power supply and distribution automation.
The relay protection device refers to an automatic device that can reflect the fault or abnormal working state of the electrical equipment in the power supply and distribution system, and can act on the circuit breaker to trip or start the signal device to send out a forecast signal.

The main tasks of relay protection are as follows:
(1) Automatically, quickly and selectively remove faulty components from the power supply and distribution system, so that other non-faulty parts can quickly resume normal power supply;
(2) It can correctly reflect the abnormal operation status of electrical equipment and send out a forecast signal so that the operator can take measures to restore the normal operation of electrical equipment;
(3) Cooperate with automatic devices of the power supply and distribution system (such as automatic reclosing devices, automatic backup power input devices, etc.) to improve the operational reliability of the power supply system.
The relay protection of the building power supply and distribution system is simple, effective, reliable, and has strong anti-interference ability.

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