Leakage circuit breakers

Abstract

The present invention provides a residual-current circuit breaker, which can reduce the average value of the test current and achieve miniaturization and thinning of a power supply circuit part. The leakage circuit breaker: a leakage detection unit (7), based on its secondary output to AC circuit (1) as a primary winding of the zero phase sequence current transformer (3) to determine whether the AC circuit leakage; a switching elements (8), the output leakage occurs in an AC circuit when the electric leakage detection unit based on the operation performed; a tripping apparatus (6), which operates the switching elements based on an output of the leakage detection unit and executed, perform the operation; a closing contact point (2), which in normal AC circuit to closed by tripping device and the AC circuit to open circuit; a testing device (9), when the action leakage test, winding supplying an analog test on leakage current flow to a test winding winding a zero phase sequence change; and a setting unit (7g), when tested in the leakage of its operation, the operation characteristic of the electric leakage detection unit is changed.

Description

technical field [0001] The present invention relates to a leakage circuit breaker with a testing device for leakage action test. Background technique [0002] In order to periodically test the operating capability of the earth leakage circuit breaker, the earth leakage circuit breaker needs to have a test device that energizes a simulated current to the detection device. [0003] On the other hand, there is known a detection device having a built-in low-pass filter (for example, see Patent Document 1). [0004] In addition, a configuration is known in which a waveform width detection function is incorporated in order to prevent unnecessary operation due to surge components such as lightning strikes. [0005] Therefore, the following structure is known in the testing device of the existing earth leakage circuit breaker, the false AC signal close to the commercial frequency, such as sine wave, rectangular wave, triangular wave and other currents are passed into the zero-phas...

AI Technical Summary

Problems solved by technology

[0009] Therefore, the power supply circuit must be able to withstand the current consumption, and there is a problem that it is difficult to reduce the size and thickness of the power supply circuit.

[0010] In addition, in order to reduce the test current, it is known that the zero-phase-sequence converter is wound with multiple turns of electric wires for energization. difficult problem

Images