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Single-core power cable fault positioning structure based on double-ended power system and ring current measurement and fault positioning method thereof

A single-core power cable, power system technology, applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., can solve problems such as heavy maintenance workload, sheath grounding fault, main insulation fault, etc.

Inactive Publication Date: 2019-01-01
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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AI Technical Summary

Problems solved by technology

[0004] Long-distance cables are often damaged by external forces due to on-site construction, resulting in ground faults in the sheath, or even failures in the main insulation
Using conventional fault location detection methods, such as bridge method, traveling wave method, etc., requires on-site measurement along the entire cable line, and the maintenance workload is heavy

Method used

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  • Single-core power cable fault positioning structure based on double-ended power system and ring current measurement and fault positioning method thereof

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Embodiment Construction

[0009] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0010] see figure 1 , this embodiment of the present invention relates to a single-core power cable fault location structure based on double-ended power supply system and circulating current measurement, including three phases a, b, and c, characterized in that: each cross-connected main section a, b, c There are current transformers connected to the grounding lines at the head end and end of the three phases, and there are 6 in each main section; current transformers are installed at the head end and the end of each cable core.

[0011] A fault location method for a single-core power cable fault location structure based on a double-ended power supply system and circulating current measurement, comprising the follow...

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Abstract

The invention discloses a single-core power cable fault positioning structure based on a double-ended power system and ring current measurement and a fault positioning method thereof. For cables in mutual connection between two transformer substations, a sheath current is measured by means of cross-connected sheath grounding. Ring current data, obtained by collection, of a sheath current transformer are compared with a cable core fault current measured at a fault phase, so that a fault position is determined and located. According to the invention, the disclosed fault positioning method is simple and is easy to implement; the needed measuring device is simple and the computing load is small; and rapid positioning is realized. The single-core power cable fault positioning structure and thefault positioning method have the actual guidance significance in main insulation fault positioning of a power cable.

Description

technical field [0001] The invention relates to the field of single-core power cable fault detection based on a double-terminal power supply system. The invention relates to a single-core power cable fault location structure and a fault location method based on a double-terminal power supply system and circulating current measurement. Background technique [0002] With the development of urban power cable systems, 110kV XLPE single-core high-voltage power cables are more and more widely used in urban distribution networks, and the cable load is also increasing. However, the operation of a large number of single-core high-voltage cables makes the cable The problem of excessive ground current has also become increasingly prominent. Usually cables are laid between substations, so it is necessary to consider the situation that the system is a double-ended power supply connected at both ends of the cable. [0003] When the cable is short-circuited after the main insulation break...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/083G01R31/50
Inventor 李浩杨挺何文翟果罗鑫洪
Owner GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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