Transformer is a device that uses electromagnetic mutual induction to transform voltage, current and impedance. The main functions of the transformer are: voltage transformation; current transformation; impedance transformation; isolation; voltage regulation. Our more common uses are to use transformers to regulate output voltage and transformers to make transformers. In fact, a very important use of transformers is to use transformers to design "leakage protectors."
There is a zero-sequence current transformer in the leakage device. Zero-sequence current transformers cannot generate induced current. If there is more outflow than inflow, the zero sequence current transformer will generate current. Drive the MCB to open the main circuit. When leakage current or personal electric shock occurs in the protected power grid, when the current of the detection element through the leakage protector reaches its leakage or electric shock action current value, the leakage protector will generate an action trip command to make the circuit it controls. The switch trips and cuts off the power supply, thus completing the task of leakage or electric shock protection. In addition to the basic function of the air circuit breaker, it can also quickly break the switch when there is leakage in the load circuit to avoid injury to personnel and adverse effects on electrical equipment when leakage occurs in the load circuit.