Leakage-proof ring and method of XLPE (Crosslinked Polyethylene) cable polarization current measurement

A polarization current and current measurement technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as polarization current measurement interference, prevent the influence of polarization current measurement, simple manufacturing method, and high measurement results accurate effect

Inactive Publication Date: 2016-02-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an anti-leakage ring for cable measurement, thereby solving the interference problem caused by surface leakage current to polarization current measurement in the prior art

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  • Leakage-proof ring and method of XLPE (Crosslinked Polyethylene) cable polarization current measurement
  • Leakage-proof ring and method of XLPE (Crosslinked Polyethylene) cable polarization current measurement
  • Leakage-proof ring and method of XLPE (Crosslinked Polyethylene) cable polarization current measurement

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[0022] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0023] The design steps of the anti-leakage ring provided by the present invention are as follows: for the measured cross-linked polyethylene cable, strip the metal shielding layer and the outer semiconducting layer at both ends of the cable as the reserved surface of the cable, and select a metal copper strip with a width of 15mm and a thickness of 2mm , and its length is selected according ...

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Abstract

The invention discloses a leakage-proof ring and method of XLPE cable polarization current measurement. Metal shielding and outer semiconductor layers at the two ends of a measured XLPE cable are peeled and serve as reserved edge surfaces, a copper strip of the width of 15mm and thickness of 2mm is selected, and the length of the copper strip is selected according to the diameter of a cable core and the thickness of an insulating layer. The length of the copper strip equals [pi*(D+d*2)+30]mm, D represents the diameter of the cable core, d represents the thickness of the insulating layer, and the margin of 30mm is considered. Holes of the diameters of 5mm are drilled at positions 5mm to the edges at the two ends of the copper strip respectively, the copper strip is bent till the holes at the two ends are leveled, and a copper ring, namely, the leakage-proof ring, is formed. The leakage-proof rings at the two ends are connected so that leakage current of the edge surfaces does not directly flow back to a power side via a current measurement module, influence of edge-surface leakage current on measurement of the polarization current is influenced, and the polarization current measured by the current measurement module does not include the edge-surface leakage current.

Description

technical field [0001] The invention relates to the field of weak signal measurement, in particular to an anti-leakage ring for XLPE cable polarization current measurement and an anti-leakage method thereof. Background technique [0002] Crosslinked Polyethylene (XLPE) cables are widely used in power transmission lines due to their excellent mechanical and electrical properties. The aging condition and remaining life of the cable insulation directly affect the stability of the power system, so the development of XLPE cable insulation diagnosis technology is of great significance for improving the stability of the power system. [0003] At present, a lot of research has been done on cable insulation diagnosis methods at home and abroad. Among them, the PDC (Polarization and Depolarization Current, PDC) method is an effective test method for detecting the aging of electrical equipment. It has the advantages of simple measurement circuit, small power supply capacity, and non-de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 李化饶建东林福昌叶刚仝进孙浩飞刘毅张钦
Owner HUAZHONG UNIV OF SCI & TECH
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