Zero-phase open-circuit protection circuit breaker
A technology of open circuit protection and circuit breaker, which is applied to emergency protection circuit devices, emergency protection devices for automatic disconnection, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Problems such as voltage protection and protection effect discounts, to achieve the effect of reducing installation costs
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[0025] Such as figure 1 As shown, the present invention relates to a zero-phase open-circuit protection circuit breaker, which includes a zero-sequence transformer 1, a leakage release 2, a piezoresistor 3, a phase line main circuit and a zero line main circuit.
[0026] The primary side of the zero-sequence transformer 1 is surrounded by the main circuit of the phase line and the neutral line of the circuit breaker; the secondary side of the zero-sequence transformer 1 is connected with the signal input end of the leakage release 2 . One end of the piezoresistor 3 is connected to the neutral line main circuit of the circuit breaker, and the other end is grounded. The operating voltage of the varistor 3 is 10-15% of the rated power supply voltage, which means that the varistor is turned on when the phase voltage shifts by 10-15%. It is also easy to malfunction if the neutral point is shifted, so as to achieve a more suitable overvoltage protection. The varistor 3 is a zinc o...
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