On-line insulation monitoring system for intelligent medium voltage switchgear and monitoring method of system

Abstract

The invention discloses an on-line insulation monitoring system for intelligent medium voltage switchgear and a monitoring method of the system. The system consists of a sensing part and a monitoring part which are connected, wherein the sensing part consists of three ultrasonic partial discharge detection units which are arranged in the dead center of the inner wall of the top surface and the dead centers of the inner walls of two adjacent side surfaces of a switchgear body, and a sleeve leakage current detection unit; the monitoring part consists of a monitoring unit and a station control layer monitoring computer which are connected; a discharge position is approximately located by a triangulation method through the time difference of signals transmitted by the three ultrasonic partial discharge detection units; a 4-20mA ultrasonic signal and a leakage current signal which are detected and converted by the ultrasonic partial discharge detection units and the sleeve leakage current detection unit can be restored, filtered and transformed; and the partial discharge condition is determined from two aspects of ultrasonic waves and electromagnetic waves, the leakage current condition of a sleeve or an insulator is monitored through leakage current, inspection time can be intelligently corrected, and monitoring reliability is improved.

Description

[0001] technical field [0002] The invention relates to an on-line monitoring system for the insulation characteristics of a medium-voltage intelligent switch cabinet, belonging to an intelligent substation monitoring system in an intelligent grid. Background technique [0003] With the gradual promotion of the smart grid, related smart devices have become an urgent demand in the market, and the intelligent transformation of traditional substations and the intelligent application of newly designed substations are imperative. The insulation on-line monitoring system of the intelligent switchgear is an important part of the intelligent switchgear. It can monitor the discharge of the switchgear online to ensure the normal operation of the switchgear. It occupies an important position in the intelligentization of the substation of the entire smart grid. [0004] The Chinese patent number is ZL 200920136831.6, disclosing an on-line partial discharge detection and management syst...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a medium-voltage intelligent switchgear insulation on-line monitoring system that can comprehensively monitor the insulation condition of the switchgear and has high reliability in order to overcome the defects of incomplete online monitoring of the insulation condition of the existing switchgear and poor reliability. The invention also proposes an insulation on-line monitoring method for the monitoring system

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