Zero-sequence characteristic quantity-based power distribution network grounding fault section positioning method

A technology of ground fault and section location, which is applied in the direction of fault location, fault detection according to conductor type, information technology support system, etc., can solve problems such as protection dead zone, difficult detection, unfavorable personal safety, etc., and meets the requirements of sampling frequency. High, fast calculation speed, low cost effect

CN112731052AInactive Publication Date: 2021-04-30SOUTH CHINA UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-04-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a zero-sequence characteristic quantity-based power distribution network grounding fault section positioning method, which comprises the following steps of S1, acquiring zero-sequence voltage and zero-sequence current magnitude of a line by utilizing a terminal, starting the terminal and reading a constant value; S2, if the zero-sequence voltage is greater than the starting constant value, determining that a grounding fault occurs; S3, after time delay, if the ratio of the zero-sequence characteristic quantity calculated by the terminal to the zero-sequence characteristic quantity of the adjacent terminal is greater than a setting value, locating the terminal with the greater zero-sequence characteristic quantity in the terminal and the adjacent terminal at the upstream of the fault point, otherwise, locating the terminal at the same side of the fault point; S4, enabling each terminal to upload a judgment result to the distribution automation master station; and S5, enabling the distribution automation master station to output a section determination result according to the judgment result of each terminal and remotely controls to remove a fault section. The method can be used for positioning the grounding fault section of the resonant grounding power distribution network, and has the characteristics of wide adaptability, high sensitivity and high calculation speed.
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Description

Technical field

[0001] The present invention relates to the field of resonant distribution network fault sections, and more particularly to a distribution method based on a distribution mesh for a zero-sequence feature amount.Background technique

[0002] The distribution network is used as the end of the power network, directly affects user safety, quality, economic and other electricity energy indicators. With the continuous development of my country's power distribution network, users put forward higher requirements for power supply, power supply, and power supply safety, once the distribution network is faulty, it is necessary to quickly fail positioning and isolation, restore users in short time powered by. Since the distribution network uses non-effective grounding operation, the ground fault current is small, and it is difficult to achieve fast and reliable isolation of the fault point. In recent years, with the increase in the chances of matching the distribution of the distributi...

Examples

Embodiment

[0020]Such asfigure 1 As shown, the present invention is a distribution method based on a zero-sequence feature amount of distribution network positioning method, which mainly includes the following steps:

[0021]S1, using the distribution network automation terminal acquisition line zero sequence voltage and zero sequence current, the distribution network automation terminal starts and reads the value.

[0022]The feeder terminal is automated by a distribution network with a sampling frequency of 10 kHz, and the zero sequence voltage and zero-sequence current flow of the line are collected.

[0023]S2, if the zero-sequence voltage is greater than the startup value, the ground fault, where the startup value is not balanced according to the maximum three-phase unbalance voltage.

[0024]S3, after delayed 5ms, if the zero-sequence feature amount calculated by the distribution network automation terminal and the ratio of the adjacent distribution network automation terminal zero sequence feature ...