Harmonic component-based arc grounding fault determination method and system for distribution cable

A technology for power distribution cables and grounding faults, applied in the direction of measuring electricity, measuring electrical variables, and information technology support systems, etc., can solve problems such as difficult to accurately identify and extract, and achieve the effects of reducing equipment loss and improving reliability and selectivity

Pending Publication Date: 2022-05-27
ANHUI ELECTRIC POWER FUYANG POWER SUPPLY +1
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Problems solved by technology

When the fault location is far away from the substation, the fault characteristics, especially the small current arc faults, such as the small cu

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  • Harmonic component-based arc grounding fault determination method and system for distribution cable
  • Harmonic component-based arc grounding fault determination method and system for distribution cable

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[0022] as Figure 1 As shown, a method for determining arc-ray ground faults of distribution cables based on harmonic components, the method comprises steps in the following sequence:

[0023] (1) Collect the three-phase voltage, zero sequence voltage and zero sequence current signal of the monitored distribution cable, and collect the arc light signal of arc light sensor 3 at the same time;

[0024] (2) The collected voltage and current signal and arc light signal are judged by the starting conditions, and if the starting conditions are not met, the subsequent collected signals are judged; if the conditions are met, the next step is entered;

[0025] (3) Take the zero sequence current signal of the monitored distribution cable after starting 1000ms, carry out bandpass filtering, obtain the harmonic content of the 50Hz to 1500Hz frequency band, find the largest band of each line with the 100ms window, compare with each other to find the maximum value, and think that the line where ...

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Abstract

The invention relates to a harmonic component-based distribution cable arc grounding fault determination method, which comprises the following steps of: acquiring three-phase voltage, zero-sequence voltage and zero-sequence current signals of a monitored distribution cable, and acquiring arc signals of an arc sensor at the same time; starting condition judgment; taking 100ms as a window to find out the section with the maximum amplitude of each line, comparing the sections with each other to find out the maximum value, and considering that the line where the section with the maximum value is located is a fault line; a record of the obtained arc light signal is called, and the time of the record is compared with the time of the marked fault line; and judging an arc grounding fault. According to the method, the arc information of the arc grounding fault and the voltage and current transient signals are obtained in real time, the harmonic change criterion of the arc is extracted, arc grounding of the distribution line is judged, the reliability and selectivity of line protection are improved, and equipment loss caused by arc is reduced.

Description

Technical field [0001] The present invention relates to the field of distribution network grounding fault identification technology, in particular a distribution cable arc grounding fault determination method and system based on harmonic component. Background [0002] The neutral point grounding method of The existing power grid in China has three kinds of neutral point grounding, neutral point grounding by arc suppression coil and neutral point ungrounding, that is, neutral point insulation, and the overvoltage caused by single-phase arc light grounding mainly occurs in the neutral point non-direct grounding power network. Single-phase grounding is the most frequent and common form of failure in power grid operation. Most of the neutral point operation mode of China's 6~66kV power grid adopts neutral point un grounding or neutral point grounded by arc suppression coil. In the operation of these power grids, the operating procedures stipulate that after the emergence of single-ph...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/58
CPCG01R31/52G01R31/58Y04S10/52
Inventor 董苏徐红芳崔超奇孙亮亮许振唐小博董梦雅袁英杰王培亮王永辉刘建曹杰刘斌
Owner ANHUI ELECTRIC POWER FUYANG POWER SUPPLY
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