High-voltage cable high-frequency partial discharge double-end monitoring partial discharge source positioning method

A technology of high-voltage cables and positioning methods, applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc., can solve problems such as GPS synchronization errors and errors, and achieve the effects of improving accuracy, saving costs, and avoiding inaccurate speeds

Active Publication Date: 2022-06-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, due to the existence of errors in GPS synchronization, there will be large errors when calculating the time difference between the signals on both sides, so it is imminent to study a more effective method that can reduce the impact of time errors

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  • High-voltage cable high-frequency partial discharge double-end monitoring partial discharge source positioning method
  • High-voltage cable high-frequency partial discharge double-end monitoring partial discharge source positioning method

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Embodiment Construction

[0022] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0023] It should be noted that the steps shown in the flowcharts of the accompanying drawings may be executed in a computer system, such as a set of computer-executable instructions, and, although a logical sequence is shown in the flowcharts, in some cases, Steps shown or described may be performed in an order different from that herein.

[0024] like Figure 1-2 As shown, the present embodiment provides a high-voltage cable high-frequency partial discharge double-end monitoring partial discharge source positioning method, including:

[0025] Use sensors on both sides of the cable to obtain PD signals on both sides;

[0026] Based on the partial discharge signals ...

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Abstract

The invention discloses a high-voltage cable high-frequency partial discharge double-end monitoring partial discharge source positioning method, and the method comprises the steps: obtaining partial discharge signals at two sides through employing sensors at two sides of a cable; based on the partial discharge signals on the two sides, analyzing and extracting pulse signals with the maximum amplitudes on the two sides, and performing similarity matching on the pulse signals to obtain matched pulse pairs; the method comprises the following steps: respectively carrying out Fourier transform on partial discharge signals at two sides to obtain an amplitude-frequency characteristic curve of the signals, calculating two-side amplitudes of the signals at two ends of a cable at a specific frequency, comparing the two-side amplitudes to obtain parameters corresponding to a partial discharge source position, and constructing an amplitude ratio and partial discharge source position knowledge base. And obtaining the partial discharge source position according to the parameters corresponding to the partial discharge source position and the partial discharge source position knowledge base. Partial discharge signals are detected on the two sides of the cable, the effect of improving the positioning accuracy is achieved, signal pulses are matched through the DTW, time errors caused by inaccurate synchronization do not need to be worried about, cost is saved, and precision is improved.

Description

technical field [0001] The invention belongs to the technical field of cable partial discharge detection, and in particular relates to a partial discharge source positioning method for high-frequency partial discharge monitoring at both ends of a high-voltage cable. Background technique [0002] Power cables are an important part of the entire power network. Power cables can be used for power transmission and distribution of high-power electrical energy. They are widely used in urban underground power grids, power station lead-out lines, and inside industrial and mining enterprises. Therefore, the reliable operation of cables is of great significance to the stable operation of the power grid. Under normal circumstances, power cables are subject to electrical, thermal, mechanical and other stresses, as well as defects caused by installation and maintenance, resulting in deterioration of insulation. Considering that the failure of power cables during use will lead to higher m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R19/175
CPCG01R31/1272G01R19/175
Inventor 孙春雨唐志国
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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