Cable line fault location method, device and system
A fault location and cable line technology, applied in fault location, measurement device, information technology support system, etc., can solve problems such as difficult operation and complicated implementation, and achieve the effect of improving efficiency and ensuring safe and reliable operation.
Active Publication Date: 2019-03-08
STATE GRID CORP OF CHINA +3
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Problems solved by technology
These methods generally have the defects of complex implementation and difficult operation
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Embodiment 1
[0029] Example 1: A cable line fault location system as attached figure 1 As shown, it includes a remote master station 1 and several cable line fault location devices 3 that are connected to the remote master station 1 through a communication network 2 for signal connection, wherein the remote master station 1 is used for overall monitoring of the network formed by the cable line connection , And each cable line fault location device 3 is used to realize the location of the ground fault occurring in the cable line. The entire cable line network is composed of several line connections, and each line is composed of several sections of cables 4 connected. Each section of cable 4 is equipped with at least one cable line fault location device 3, which can be set at one end of the cable 4. In this embodiment, in order to obtain a more accurate positioning conclusion, a cable line fault location device 3 is provided at the first and end ends of each cable section.
[0030] As attached ...
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The invention relates to a cable line fault positioning method. The cable line fault positioning method comprises the following steps of (1) setting an overflow threshold valve for line zero sequence current of every section of a cable, setting a inductance coefficient for sheath grounding current of every section of the cable and measuring the line zero sequence current and the sheath grounding current of every section of the cable; (2) judging fault positions, judging the section of the cable to be faulted when the line zero sequence current of the section of the cable is larger than the set overcurrent threshold value and judging the sheath grounding current of the section of the cable is larger than a product of the sensing coefficient and the line zero sequence current of the section of the cable. The invention also relates to a cable line fault positioning device and system applying the above method. According to the device and the system in combination with the method, the fault position of the cable line can be rapidly and accurately positioned, the fault corrective maintenance efficiency can be improved, and safe and reliable operation of the power grid is guaranteed.
Description
Technical field [0001] The invention relates to a method for locating faults occurring in a cable line, as well as an adopted device and system. Background technique [0002] Most of my country's 20kV medium-voltage distribution network adopts a neutral point grounded operation mode through a small resistance. The rapid and accurate positioning of power distribution line faults, especially single-phase grounding faults, not only plays an important role in repairing lines and ensuring reliable power supply, but also in ensuring the safety, stability and economic operation of the entire power system. The single-phase grounding fault of the distribution network is the most likely type of fault, so the fault location of the distribution network is mainly to solve the problem of accurate positioning of the single-phase grounding fault. [0003] At present, the 20kV medium voltage distribution network generally uses three-core XLPE power cables. The composition of the power cable from ...
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IPC IPC(8): G01R31/08G01R31/02
CPCY04S10/52
Inventor 朱国防董晓峰郭法安陈会吕培强
Owner STATE GRID CORP OF CHINA