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Online fault range finding method of T-connection cable

A technology of fault distance measurement and cable wire, which is applied in the direction of fault location, etc., can solve the problem of distance measurement dead zone, etc., and achieve the effect of high test accuracy and simple test method

Inactive Publication Date: 2016-01-20
POWER GRID TECH RES CENT CHINA SOUTHERN POWER GRID +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide an online fault distance measurement method for T-connected cables to solve the problem of dead zones in distance measurement in the prior art

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  • Online fault range finding method of T-connection cable
  • Online fault range finding method of T-connection cable
  • Online fault range finding method of T-connection cable

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Embodiment Construction

[0031] In order to make the purpose of the invention, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0032] The on-line fault location method of the T-connected cable of the present invention comprises the following steps: (1) synchronously collecting voltage and current signals at the cable port; (2) judging the nature of the fault and the fault line; (3) solving the transmission line equation to obtain cable The relationship between the voltage and current of the port and the voltage and current of any point on the cable line; (4) Calculate the voltage and current of the common point of the cable according to the leng...

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Abstract

The invention discloses an online fault range finding method of a T-connection cable. The method comprises the following steps that (1) according to a distribution parameter model of a uniform transmission line, the relation between voltage and current of a port of the cable and the current and current of a random point of the cable is obtained; (2) according to the length of the fault-free end of the cable, the voltage and current of a common point of the cable are obtained; (3) voltage and current signals of the port of the cable are collected synchronously; (4) the fault type is determined; (5) a fault line is determined; and (6) according to voltage and current signals at the two ends of the fault end of the cable, the position of a fault point is obtained. According to the method, extra equipment is not needed, it is only required to measure the voltage and current signals of the port of the T-connection cable synchronously, the test method is simple, and the test precision is high.

Description

technical field [0001] The present invention relates to fault detection of electric power system, more specifically, relates to an online fault distance measurement method of T-joint cable. Background technique [0002] Because the cable is not affected by natural conditions, small in size, does not occupy the space of the line corridor, and has the advantages of safety, reliability, and improvement of urban layout, it has been more and more widely used in the current power system. Especially for T-connection cables, due to the simple wiring method, fast construction speed, and can effectively reduce equipment investment and save land for transmission corridors, it has attracted widespread attention from electric power engineers. [0003] However, due to insulation aging and deterioration, thermal load, mechanical damage, sheath corrosion, insulation damp, overvoltage, material defects and other reasons, the cable has different forms of failure. The occurrence of cable acci...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 尹建华洪潮杨诚
Owner POWER GRID TECH RES CENT CHINA SOUTHERN POWER GRID
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