Live detection and online monitoring device for extra-high voltage power cable insulation diagnosis

Abstract

The present invention discloses a live-line detecting and on-line monitoring device used for ultrahigh-voltage power cable insulation diagnosis. The device comprises an A-end system and a B-end system which are arranged at the head end and the tail end of a tested cable respectively, and in each of the A-end system and the B-end system, a current comparator sleeves a to-be-tested cable body, one input end of a central control subsystem is connected with the output end of the current comparator, and the other end is connected with a to-be-tested voltage via a standard capacitor, and the output end of the central control subsystem is connected with the input end of the current comparator via a voltage control current source. The central control subsystem of the A-end system is also connected with a data processing terminal, and the central control subsystems of the A-end system and the B-end system are connected and are communicated via a GPRS wireless network. The live-line detecting and on-line monitoring device used for the ultrahigh-voltage power cable insulation diagnosis of the present invention is reasonable in design and simple in structure, can realize the ultrahigh voltage cable insulation live-line detection and on-line monitoring, enables the overall utilization rate to be improved effectively, at the same time, enables the production efficiency to be improved and the production cost to be reduced.

Description

technical field [0001] The invention relates to a live detection and on-line monitoring device for insulation diagnosis of ultra-high voltage power cables, belonging to the technical field of high voltage internal insulation. Background technique [0002] With the continuous acceleration of urbanization and the continuous increase of electricity consumption in the whole society, 220kV and above ultra-high voltage XLPE cables have almost completely replaced traditional forms of electricity due to their good process structure, excellent electrical performance and safe and reliable operation characteristics. Therefore, the accurate diagnosis of its operation status becomes an important link to ensure the reliable operation of the transmission network. [0003] It is generally believed that the occurrence of partial discharge, electric tree branch, and water tree branch is the cause of the aging and decline of insulation performance of XLPE cables and their accessories. EHV cab...

AI Technical Summary

Problems solved by technology

Among them, the loss factor method and the harmonic component method of loss current have been applied in the field of power cable outage detection, but have not yet been applied in the field of cable status evaluation.

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