Insulation aging diagnostic system and method based on 10kV XLPE cable

A technology of insulation aging and diagnosis system, applied in the direction of testing dielectric strength, etc., can solve the problems of slow release of residual charge, inconspicuous characteristic quantity, and inability to well reflect the aging state of cable insulation water trees, etc., to achieve easy release, Prevention of insulation accidents, good detection effect

Active Publication Date: 2014-02-05
STATE GRID CORP OF CHINA +1
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Problems solved by technology

Among these methods, each method has its own advantages and disadvantages, and none of them can reflect the water tree aging state of cable insulation well.
In recent years, the off-line diagnosis method that uses

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  • Insulation aging diagnostic system and method based on 10kV XLPE cable

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Embodiment Construction

[0020] The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0021] A system and method for diagnosing insulation aging based on 10kV XLPE cables, the system includes: 10kV XLPE cables containing water trees, a DC power supply, a high-voltage pulse power supply and a data acquisition and processing unit, such as figure 1 As shown, one end of the core wire of a 10kV XLPE cable containing water is connected to one end of switch S1, switch S2, and switch S3 through wires, the other end of switch S1 is connected to DC power supply, the other end of switch S2 is grounded, and the other end of switch S3 is connected to high voltage Pulse power supply, connect a resistor R between the outer side of the insulating layer of the water-containing tree 10kV XLPE cable near this end a...

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Abstract

The invention relates to an insulation aging diagnostic system and method based on a 10kV XLPE cable. The system comprises a water tree 10kV XLPE cable, a direct-current power supply, a high-voltage pulse power supply and a data collecting and processing unit. The method includes the steps that firstly, a negative direct-current voltage Vdc is exerted on the water tree 10kV XLPE cable; secondly, the high-voltage side of the cable is grounded, and trapped charges become residual charges in the grounding discharging process; thirdly, a high-voltage pulse voltage is exerted on the water tree 10kV XLPE cable, and voltage direct-current component signals on a resistor R are collected through the data collecting and processing unit, the time integral operation is performed, and the residual charge quality is obtained; fourthly, the water tree aging degree of the cable is judged according to the residual charge quantity. The insulation aging diagnostic system and method can well detect the water tree aging degree and is obvious in detection effect and capable of effectively preventing insulating accidents.

Description

technical field [0001] The invention belongs to the technical field of cross-linked polyethylene cable insulation aging analysis and diagnosis, in particular to an insulation aging diagnosis system and method based on 10kV XLPE cables. Background technique [0002] The degree of cableization of urban power grid is an important symbol to measure the technical level of urban power grid, and it is also a necessary means to promote the rapid progress of urban civilization and improve the urban living environment. In the past 30 years, various technologies of power cables at home and abroad have developed rapidly, especially the development of three-layer co-extrusion production process to manufacture XLPE cables, which makes XLPE cables need no oil supply equipment and have better fire resistance compared with oil-filled cables. , Simple installation and maintenance, good mechanical and electrical performance, etc., are adopted by more and more countries. At present, the cables...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 何勇毛华李盛伟马力黄临存范伟王兆峰耿芳郭晋芳张梅侯彩龙
Owner STATE GRID CORP OF CHINA
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