Output earth leakage protection device for high-voltage and direct-current power supply system

Abstract

The invention discloses an output earth leakage protection device for a high-voltage and direct-current power supply system. The output earth leakage protection device is characterized in that the output earth leakage protection device comprises a pulse generation circuit, a detection circuit and a protection circuit, wherein the detection circuit comprises a first earth leakage detection circuit and a second earth leakage detection circuit; in the first earth leakage detection circuit, an output anode of a high-voltage and direct-current power supply is opposite to a protective earth; in the second earth leakage detection circuit, a protective earth is opposite to an output cathode of the high-voltage direct-cirrent power supply; the first earth leakage detection circuit comprises a first switch circuit, a first earth leakage signal transduction circuit and a first electric isolation circuit; the second earth leakage detection circuit comprises a second switch circuit, a second earth leakage signal transduction circuit and a second electric isolation circuit; and the control protection circuit is used for outputting a shutdown signal for indicating the shutdown of the high-voltage and direct-current power supply system according to a signal of the first earth leakage signal transduction circuit or the second earth leakage signal transduction circuit. The output earth leakage protection device is controlled by hardware, so that the control response speed is high.

Description

technical field [0001] The invention relates to a leakage protection device, in particular to an output leakage protection device used in a high-voltage direct current power supply system. Background technique [0002] With the country's requirements for energy saving and emission reduction, the high-voltage DC power supply system has been developed rapidly. At the same time, the requirements for the safe use of the power supply system are also getting higher and higher. At present, since the output of the high-voltage DC power supply system is generally suspended grounding, that is, the system output is not directly connected to the ground, the frame, and the shell, so the leakage cannot be detected with the traditional DC leakage sensor. [0003] Therefore, how to detect the leakage current in the high-voltage DC power supply system is one of the problems to be solved urgently in the industry. Contents of the invention [0004] The technical problem to be solved by the ...

AI Technical Summary

Problems solved by technology

At present, because the output of the high-voltage DC power supply system is generally suspended grounding, that is, the system output is not directly connected to the ground, the frame, and the shell, so the traditional DC leakage sensor cannot detect any leakage.

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