Leakage relay

Abstract

The present invention provides a leakage relay, which can perform a leakage test without winding a test coil on a zero-phase current transformer, and at the same time, can detect a disconnection or missing connection with a zero-phase current transformer without increasing the circuit scale . This leakage relay has: a first detection resistor, which converts the output current obtained by the zero-phase converter into a voltage; a leakage detection circuit, which determines the level of the voltage; an output circuit, which corresponds to the output of the leakage detection circuit, and drives The leakage display element; the analog waveform generation circuit, which generates an analog waveform based on the pressing of the test button, and the analog waveform is judged by the leakage detection circuit as being at the same level as the leakage in the main circuit; the amplifier circuit, which is interposed between the first detection Between the resistor and the leakage detection circuit, when the connecting lead wire is disconnected, the voltage obtained by dividing the voltage of the first detection resistor is input; and a comparator, which compares the signal amplified by the amplifier circuit with the reference potential, and compares the The output is input to the output circuit.

Description

technical field [0001] The present invention relates to a leakage relay, which cooperates with a zero-phase current transformer to detect the leakage of the main circuit, and outputs the occurrence of the leakage to the outside. Specifically, it relates to a device for confirming its function Improvements to the test setup. Background technique [0002] As we all know, the earth leakage circuit breaker, which is one of the circuit breakers, has a built-in leakage detection circuit, a zero-phase current transformer and an electromagnet device such as an integrated circuit in the leakage circuit breaker. The level of the signal detected by the detector is judged. If it exceeds the specified value, the drive signal is output to the electromagnet device and the main circuit is disconnected. In addition, it is well known that a test device (test button) for confirming whether the leakage detection function can operate normally is incorporated therein. [0003] This leakage circ...

AI Technical Summary

Problems solved by technology

[0006] However, in other words, even in actual use, that is, when the leakage relay is connected to the zero-phase converter, the zero-phase converter itself cannot be confirmed by testing.

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