Intelligent online monitoring device of partial discharge of 10 kV distribution cable

Abstract

The invention provides an intelligent online monitoring device of partial discharge of a 10 kV distribution cable. The intelligent online monitoring device comprises a pulse current sensor, a pulse voltage sensor, a high-frequency signal cable and a monitoring host, wherein the pulse current sensor and the pulse voltage sensor are clamped on a shield grounding line of the 10 kV distribution cable and is used for monitoring a pulse signal of the shield grounding line; two paths of pulse signals respectively monitored by the pulse current sensor and the pulse voltage sensor are transmitted to a monitoring host respectively through high-frequency signal cables; the monitoring host analyzes the two paths of the pulse signals after the two paths of the pulse signals are monitored and judges whether partial discharge or cable interference of the 10 kV distribution cable exists. For the implementation, the intelligent online monitoring device of the partial discharge of the10 kV distribution cable, disclosed by the invention, has the advantages of creatively solving the always existed problems that inner partial discharge, outer noise and mutual interference among multiple cable circuits cannot be identified on the scene of a transformer substation when the cable insulating state is monitored by testing the pulse current on the shield grounding line of the distribution cable on line, and improving monitoring effects as well as work efficiency.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an intelligent 10kV distribution cable partial discharge on-line monitoring device. Background technique [0002] The research and application of power equipment insulation condition monitoring technology is an important content in the current smart grid construction and operation management. Distribution cables are widely used in power distribution networks. In order to ensure their operational reliability, a partial discharge monitoring technology has been used more and more in power companies in recent years. This technology can By short-term or long-term placement of high-frequency current sensors on the grounding wires at both ends of the cable, measuring the pulse current flowing through it, and analyzing the signal strength and activity frequency, the on-line monitoring and fault diagnosis of the insulation status of distribution cables can be realized. [0003] A...

AI Technical Summary

Problems solved by technology

[0007] The invention provides an intelligent 10kV distribution cable partial discharge on-line monitoring device, which has the characteristics of safety, portability and high efficiency, and innovatively solves the problem that the existing monitoring system is difficult to identify external interference signals and real cable internal partial discharge signals technical difficulties, improved the technical level of related fields and made up for the deficiencies in the application practice of monitoring technology in power enterprises

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