Leakage protection function automatic detection circuit and detection method

Abstract

The invention discloses a leakage protection function automatic detection circuit and a detection method. The leakage protection function automatic detection circuit comprises a current transformer, a simulation leakage current module, a leakage detection processing module, a rectification module, a trip coil, a controllable device control module and a control unit module. An analog leakage current only located on an analog half-wave of the main loop alternating current is generated, and the analog half-wave is a positive half-wave or a negative half-wave of the main loop alternating current; current for driving the trip coil to act is limited on the analog half-wave of the alternating current of the main loop, so that the current on the analog half-wave cannot drive the trip coil to act, and the current on the non-analog half-wave can drive the trip coil to act; after the analog leakage current is generated, the signal for triggering the action of the trip coil is monitored, if the signal for triggering the action of the trip coil is monitored, the leakage protection function is normal, otherwise, the leakage protection function is abnormal, the leakage protection function can be automatically and regularly checked, and normal use of the circuit is not influenced.

Description

technical field [0001] The invention relates to the field of electric leakage protectors, in particular to an automatic inspection circuit and inspection method for electric leakage protection functions. Background technique [0002] With the construction of the smart grid, the safety of electricity consumption has been paid more and more attention by the state and society, and users have gradually requested that the protection switch has a leakage protection function. In the general requirements for leakage current protectors (GB-26829-2008), it is pointed out that leakage protectors should be equipped with test devices, which simulate a leakage current not exceeding the preset current at rated voltage, so as to regularly check the remaining The action capability of the current protection device. [0003] In practice, a test button is usually set on the surface of the leakage current protector. When the test button is triggered, it can be regarded as simulating the leakag...

AI Technical Summary

Problems solved by technology

However, the detection method of artificially triggering the test button once a month has low operability, causing the leakage current protector to be in a potentially unsafe working state

In addition, when the above-mentioned test method for checking the operating ability of residual current protective devices will cause interruption of power supply, in some important places where electricity is used, power interruption is not allowed. has certain limitations

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