Intelligent ultrahigh-voltage XLPE power cable capable of monitoring partial discharge on line

Abstract

The invention relates to an intelligent ultrahigh-voltage XLPE power cable capable of monitoring partial discharge on line, which comprises the following components from inside to outside in sequence: a conductor core, an inner semi-conductive layer, an XLPE insulator, an outer semi-conductive layer, a semi-conductive buffer layer, partial discharge detection space phase fiber gratings, fiber casing pipes containing buffer protective layers, a corrugated aluminum sheath, an anti-corrosion coating and an outer sheath. Two fiber casing pipes containing the buffer protective layers are pre-embedded in the semi-conductive buffer layer; each fiber casing pipe containing the buffer protective layer is coated with one partial discharge detection fiber grating to form a set of partial discharge fiber grating detection unit; and each set of partial discharge fiber grating detection unit is spirally wound in the semi-conductive buffer layer. Due to the adoption of the invention, the insulation state in the ultrahigh-voltage XLPE power cable can be automatically monitored on line in real time so as to effectively ensure the running safety and reliability of the ultrahigh-voltage XLPE power cable and create conditions for finding problems in time and maintaining in advance.

Description

technical field [0001] The invention belongs to an ultra-high voltage power cable, in particular to an intelligent ultra-high voltage XLPE power cable capable of on-line monitoring of partial discharge, which is suitable for voltage levels of 110kV to 500kV. Background technique [0002] Cross-linked polyethylene (XLPE for short) power cables have many advantages such as simple manufacturing process, easy installation and laying, and are not limited by drop, excellent electrical and thermal mechanical properties, large transmission capacity, convenient operation and maintenance, and small fire hazards. The mainstream of cable development and engineering applications. Especially in the voltage level of 110kV and above, the application of XLPE power cables is developing rapidly. According to incomplete statistics, the total length of ultra-high voltage XLPE power cables with a voltage level of 110kV and above that has been put into operation in my country has exceeded 5000km,...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an intelligent ultra-high voltage XLPE power cable that can monitor partial discharge on-line, which can automatically monitor its internal insulation state, detect potential failures in time, and timely alarm and generate positioning Information, can avoid operation accidents caused by continuous deterioration of insulation defects, meet the requirements of ultra-high voltage XLPE power cable operation status monitoring and intelligent diagnosis, and is suitable for voltage levels of 110kV ~ 500kV

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