Leakage protection device with extended function

Abstract

The invention discloses a leakage protection device with an extended function, belonging to the field of a low-voltage power distribution protection device. The leakage protection device comprises a zero-sequence current transformer, a release, an IC (integrated circuit) drive circuit, a test circuit and a function extension circuit; wherein the release is connected with a power grid, and a phase line, a zero line and an earth wire are led to supply electricity to a load; one end of an electromagnet coil of the release is connected with the G end of the IC drive circuit, and the other end of the electromagnet coil of the release is connected with the phase line which does not pass through the zero-sequence current transformer; one end of a secondary coil of the zero-sequence current transformer is connected with the A end of the IC drive circuit, and the other end of the secondary coil of the zero-sequence current transformer is connected with the B end of the IC drive circuit; the H end of the IC drive circuit is connected with the output end of the function extension circuit; the B end of the IC drive circuit is connected with a reference voltage input end of the function extension circuit; the K end of the test circuit is connected with the phase line which does not pass through the zero-sequence current transformer, and the input end of the function extension circuit is connected with the earth wire. The leakage protection device can provide immediate protection to abnormal electrification of the earth wire of the power grid or electrification of a housing of an electric appliance, and the temperature rise protection is achieved.

Description

technical field

[0001] The invention belongs to the technical field of low-voltage power distribution protection devices, and relates to a leakage protection device, in particular to a leakage protection device with extended functions. Background technique

[0002] Since the invention and use of electricity by human beings, electricity has not only brought a lot of convenience to human beings, but also brought many disasters to human beings. At present, the proportion of non-compliance in the safety of the electricity environment in our country is still very high, and there are still many potential safety hazards. If the electrical power supply wiring is incorrect, there is no grounding or poor grounding, the use of inferior sockets, and the ground wire of the power supply is abnormally charged, etc., the electrical shell will be charged, resulting in electric shock accidents. So when all kinds of electrical appliances come one after another, all kinds of protection devices...

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