A distribution network grounding line selection method based on distributed distribution terminal devices

A power distribution terminal, grounding line selection technology, applied in the fault location, detection of faults by conductor type, etc., can solve problems such as increased cost and construction, management difficulty, fault expansion, etc., to reduce human participation, improve reliability and speed. The effect of improving the accuracy of line selection

Active Publication Date: 2019-05-07
NR ELECTRIC CO LTD +1
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  • Claims
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Problems solved by technology

[0009] Method (3) needs to increase the signal injection source equipment, which increases the cost and construction and management difficulties, and there is a risk of fault expansion after the signal injection source is put into use

Method used

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  • A distribution network grounding line selection method based on distributed distribution terminal devices
  • A distribution network grounding line selection method based on distributed distribution terminal devices
  • A distribution network grounding line selection method based on distributed distribution terminal devices

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Embodiment Construction

[0032] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] An embodiment of the present invention provides a distribution network grounding line selection method for a distribution terminal, including the following steps:

[0034] (1) Each power distribution terminal device analyzes and processes the voltage and current collected by it.

[0035] Specifically, the embodiment attached figure 2 Each power distribution terminal device collects information such as the voltage, current, and switch position of the line. When the line is running and the switch is in the closed position, each power distribution terminal device is based on the pre-set low-current grounding system mode. For different grounding systems , using different methods to analyze voltage and current.

[0036] attached figure 2 Among them, for the neutral point ungrounded system, the wavelet analysis method is used to analyze the volta...

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Abstract

The invention discloses a power distribution network grounding line selection method based on distributed power distribution terminal devices. According to the method, the power distribution terminal devices complete the grounding line selection work through improving the existing method and mutual data interaction of the distributed power distribution terminal devices so that reliability and rapidity of line selection under the situation of single-phase grounding fault in a small current grounding system can be enhanced. According to the method, manual participation can be avoided or reduced, a monitoring system host or an independent line selection device is not required, signal injection source equipment is not additionally installed, and different algorithms are matched with different modes of small current grounding systems for analysis so as to enhance the correct rate of line selection. Meanwhile, data analysis is dispersed to all the power distribution terminal devices to be synchronously performed so that the problems of waste of resources and low reliability caused by the fact that analytical calculation is concentrated on one set of equipment can be avoided.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, in particular to a line selection method when a single-phase grounding fault occurs in a small current grounding system of a 6-110kV distribution network. Background technique [0002] The line selection and location of single-phase ground faults in small current grounding systems have always been a technical difficulty that plagues the operation of distribution networks. Connect together and serve as backup to each other to improve power supply reliability. In such a system, when a single-phase ground fault occurs at any point, the entire system will sense zero-sequence voltage and enter a fault state. Currently commonly used line selection methods are: [0003] (1) Trial jumping method, the operator disconnects the possible grounding lines sequentially through local or remote control based on experience, and when the zero-sequence voltage disappears, it indicates that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 曾先锋朱中华侯炜陈俊王文龙石勇倪群辉宋志伟
Owner NR ELECTRIC CO LTD
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