A method for locating single-phase ground fault section in resonant ground system

A single-phase grounding fault and resonant grounding technology, applied in the fault location, detecting faults by conductor type, instruments, etc., can solve the problems that plague the power sector and achieve the effect of no filtering

Active Publication Date: 2019-06-11
XIAN XIRUI CONTROL TECH CO LTD
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Problems solved by technology

For a long time, the single-phase grounding line selection problem of the resonant grounding system has plagued the power sector

Method used

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  • A method for locating single-phase ground fault section in resonant ground system
  • A method for locating single-phase ground fault section in resonant ground system
  • A method for locating single-phase ground fault section in resonant ground system

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Embodiment Construction

[0021] The invention aims to solve the single-phase grounding section positioning problem of the resonant grounding distribution network. It is pointed out that the arc suppressing coil has different influences on the upstream zero-sequence current of the fault point of the fault line at different frequencies, but the zero-sequence current of the healthy line and the downstream of the fault point of the fault line is the capacitive current excited by the system zero-sequence voltage, which is not affected by the arc suppression coil influences.

[0022] Taking the resonant grounding system with m outgoing lines as an example, as figure 1 shown, where i 0m Indicates the zero-sequence current of the mth line, u 0 Indicates the zero-sequence voltage, C m Indicates the equivalent capacitance to ground of the mth line. For the faulty line, the superscript without "'" indicates the equivalent ground capacitance of the upstream line of the fault point, and "'" indicates the equiva...

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Abstract

The invention discloses a resonant grounding system single-phase grounding fault section positioning method integrated with high-frequency and power frequency zero-sequence component phase features, and the method comprises the steps: 1, processing a zero-sequence voltage and zero-sequence current, collected by each data collection device, through a matrix pencil algorithm, and obtaining the phases of all frequency components of the zero-sequence voltage and the zero-sequence current; 2, calculating the phase angle difference dph(50) of a zero-sequence voltage power frequency component and a zero-sequence current power frequency component of the same collection device; 3, calculating the phase angle difference dph(fm) of any one high-frequency component of the zero-sequence voltage and any one high-frequency component of the zero-sequence current; 4, calculating the absolute value dj of the difference between the phase angle difference dph(50) and the phase angle difference dph(fm); 5, recognizing a fault segment according to the size of dj. The method makes the most of the features of the high-frequency and power frequency components. Compared with a conventional resonant grounding system section position method based on transient features, the method does not need to carry out filtering.

Description

technical field [0001] The invention belongs to the technical field of relay protection for distribution networks, and in particular relates to a method for locating a single-phase ground fault section of a resonant ground system. Background technique [0002] my country's distribution network mostly adopts the neutral point grounding method through the arc suppression coil, and in order to avoid resonance overvoltage, it is usually a compensation operation. For a long time, the single-phase grounding line selection problem of the resonant grounding system has plagued the power sector. In 2015, the National Energy Administration issued the "Action Plan for Construction and Transformation of Distribution Networks (2015-2020)". The document pointed out that the funds for the construction of distribution networks in the future will not be less than 2 trillion yuan. It can be said that the development of distribution networks will welcome An unprecedented opportunity has come. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/086G01R31/50
Inventor 宋国兵常仲学
Owner XIAN XIRUI CONTROL TECH CO LTD
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