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Method and device for locating partial discharge of high voltage cable

A high-voltage cable, partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve problems such as economic loss, installation defects, cable defects, poor positioning accuracy, etc.

Active Publication Date: 2013-10-09
SUZHOU GUANGGE EQUIP
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Problems solved by technology

Although this detection method can solve the detection of partial discharge and the location of the discharge source, it is cumbersome to implement and the positioning accuracy is poor.
This not only causes unnecessary economic losses, but also makes it difficult to find some installation defects and cable defects that need years of development to gradually appear.
Therefore, the current devices and methods cannot accurately locate the discharge source on the high-voltage cable body

Method used

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  • Method and device for locating partial discharge of high voltage cable
  • Method and device for locating partial discharge of high voltage cable
  • Method and device for locating partial discharge of high voltage cable

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Embodiment Construction

[0020] Please refer to figure 1 , an embodiment provides a method for locating a partial discharge of a high-voltage cable. The high-voltage cable partial discharge positioning method can accurately determine the location of the discharge source, and the high-voltage cable partial discharge positioning method includes the following steps:

[0021] Step S110, obtaining the length l of the high-voltage cable to be detected and the propagation velocity v of the discharge signal in the high-voltage cable. The length l of the high voltage cable can be obtained through actual measurement. The propagation velocity v of the discharge signal in the high-voltage cable can be obtained by testing the propagation time of the discharge signal in a certain length of high-voltage cable. The length l of the high-voltage cable and the propagation velocity v of the discharge signal in the high-voltage cable are obtained for the subsequent calculation of the position of the discharge source.

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Abstract

The invention provides a method and device for locating partial discharge of a high voltage cable. According to the method for locating the partial discharge of the high voltage cable, firstly, the time difference t generated when a discharge signal emerging in a high voltage cable to be detected is transmitted to the two ends of the high voltage cable to be detected, and then a discharge position x of a discharge source on the high voltage cable is obtained through calculation based on a formula x=vt+1 / 2. Therefore, the position of the partial discharge of the high voltage cable can be detected accurately.

Description

technical field [0001] The invention relates to the field of high-voltage cable detection, in particular to a high-voltage cable partial discharge positioning method and device. Background technique [0002] With the continuous development of the power grid and the needs of urban power grid transformation, the use of high-voltage cable lines in my country is increasing year by year. Practical experience shows that the failure of high-voltage cable lines is an important cause of power grid accidents and major economic losses. Therefore, it is of great significance to accurately and timely grasp the operation status of the cable line to reasonably deal with hidden troubles and ensure the stable operation of the power grid. [0003] At present, the commonly used method for testing the operation of high-voltage cables is to conduct off-line withstand voltage tests before putting into operation or periodically shutting down the high-voltage cables in operation. For example, the...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 姜明武陈志标张树龙韩叶祥
Owner SUZHOU GUANGGE EQUIP
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