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1、 Tasks and requirements of relay protection
1. Tasks of relay protection
in order to ensure the safe operation of power supply and distribution system and avoid the influence of over-current caused by overload and short circuit on the system, different types of over-current protection devices shall be installed in the power supply and distribution system.The common over-current protection devices include fuse protection, low-voltage circuit breaker protection and relay protection.Among them, relay protection is widely used in high-voltage power supply and distribution system, which has many protection functions and is the basis of realizing power supply and distribution automation.
Relay is a kind of automatic control electrical appliance which can turn on or off the small current control circuit according to some kind of input signal to realize remote control and protection.Its input can be current, voltage and other electricity, but also can be temperature, time, speed, pressure and other non electric quantity, while the output is the action of contact or the change of circuit parameters.
Relay is a kind of control device. It is usually used as a control switch in the circuit. It can achieve the purpose of controlling the circuit on and off through electromagnetic conversion. The appearance is various, but the principle is the same. The relay can be used in various circuits to realize the functions of switch, conversion and delay. However, it is seldom used as leakage protection device in the circuit.