Method for evaluating insulation performance of power cable in stage with voltage being 35kV or below 35kV

A technology for insulation performance and power cables, which is applied in the direction of testing dielectric strength, using pulse reflection method to detect faults, fault locations, etc., can solve the problem of lack of accurate methods for grasping the insulation performance of power cables of 35kV and below, and achieves simple and easy operation convenient effect

Inactive Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a method for evaluating the insulation performance of power cables with a voltage

Method used

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  • Method for evaluating insulation performance of power cable in stage with voltage being 35kV or below 35kV
  • Method for evaluating insulation performance of power cable in stage with voltage being 35kV or below 35kV
  • Method for evaluating insulation performance of power cable in stage with voltage being 35kV or below 35kV

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, the method for evaluating the insulation performance of power cables with a voltage level of 35kV and below in the embodiment of the present invention includes the following steps:

[0024] S101: According to the operation situation, determine the power cable that needs to be evaluated for insulation performance, and arrange the power failure detection for this section of the cable line in combination with the maintenance plan of t...

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Abstract

The invention discloses a method for evaluating the insulation performance of a power cable in a stage with the voltage being 35kV or below 35kV. The method comprises the steps of determining the power cable which is in need of carrying out insulation performance evaluation and planning to carry out power failure detection on a section of cable circuit by combining with an overhaul plan of electrical devices which are connected with the power cable; disconnecting the section of the cable circuit with the electrical devices at two ends and ensuring a safe distance between the section of the cable circuit and adjacent electrical devices; applying oscillation wave voltage to a tested cable through a dedicated detection device and carrying out local discharge detection on the cable circuit; carrying out system analysis on a local discharge detection result by comparing a cable path and a position laying situation of an intermediate joint; meanwhile, carrying out effective evaluation on the insulation performance of the cable circuit by combining the size and the generation position of local discharge capacity of the cable circuit. According to the method disclosed by the invention, effective evaluation is carried out by carrying out the oscillation wave local discharge detection, safe and reliable running of a power grid is ensured, and the problem that a method for accurately mastering the insulation performance of the power cable in the stage with the voltage being 35kV and below 35kV is lack at present can be better solved.

Description

technical field [0001] The invention belongs to the technical field of power system cables, in particular to an evaluation method for the insulation performance of power cables with a voltage level of 35kV and below. Background technique [0002] At present, since power cables are widely used in urban power grids, the failure rate of cables directly affects the power supply reliability of the power grid. As time goes by, the insulation aging of cables will be further aggravated, and the grid faults caused by this will become more frequent, which will seriously threaten the safe operation of the grid. [0003] The prior art lacks methods for accurately grasping the insulation performance of power cables of 35kV and below. Contents of the invention [0004] The purpose of the embodiments of the present invention is to provide a method for evaluating the insulation performance of power cables with a voltage level of 35kV and below, aiming at solving the problem of lack of me...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/11
Inventor 唐庆华刘宝成满玉岩周凤争孟峥峥李旭王浩鸣
Owner STATE GRID CORP OF CHINA
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