Power distribution network single-phase earth fault section locating method based on correlation analysis

A single-phase ground fault, section location technology, applied in fault location, electrical digital data processing, special data processing applications, etc. Positioning research results can not be discussed, etc., to achieve the effect of easy implementation and simple principle

Inactive Publication Date: 2014-12-03
XI AN JIAOTONG UNIV +3
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Problems solved by technology

[0003] Most of my country's distribution network adopts the neutral point small current grounding method. Affected by the neutral point grounding method, distribution network scale, transition resistance and other factors, the problem of fault line selection has not been sati

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  • Power distribution network single-phase earth fault section locating method based on correlation analysis
  • Power distribution network single-phase earth fault section locating method based on correlation analysis
  • Power distribution network single-phase earth fault section locating method based on correlation analysis

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] The principle of the present invention is: based on the idea of ​​the first capacity frequency band (source: Electric Power System Automation, 2003, 27 (9): 48-53), when a single-phase ground fault occurs in the distribution network, within a selected frequency band and Under the specified voltage reference direction and current reference direction (the voltage reference direction is the measurement point relative to the ground, and the current reference direction is from the bus to the line), the zero-sequence model of the healthy line and the line behind the fault point can be equivalent to a capacitor , at this time, the derivative of its zero-sequence current and zero-sequence voltage is a proportional function with a positive proportional coefficient; and for the fault line, its zero-sequence model is composed of the circuit on the back side of the system, a...

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Abstract

The invention provides a power distribution network single-phase earth fault section locating method based on correlation analysis. The fault line selection problem in the single-phase earth fault process of a power distribution network is not solved well, and fault locating is more difficult to refer to. After a single-phase earth fault happens to a system, the first capacitive frequency band concept is utilized, each line is simplified into a capacitance model in a zero-sequence network under the selected frequency band, earth fault detection devices are arranged on line outlets and branches to measure zero-sequence voltages and zero-sequence currents, association coefficients of zero-sequence voltage differentials and the zero-sequence currents are obtained, whether fault points are in the section or not is judged according to plus and minus of the obtained association coefficients, finally the association coefficients are judged and calculated to be minus, and the section farthest away from a bus is the section where the fault points are located. The method is simple in principle and easy to implement, fault section locating can be carried out fast and reliably, and the method can be used for neutral ungrounding power distribution systems and can be used for power distribution systems with neutral points grounded through arc suppression coils.

Description

technical field [0001] The invention relates to a method for locating a fault section in a power system, in particular to a method for locating a single-phase ground fault section in a distribution network based on correlation analysis. Background technique [0002] The distribution network is directly connected to users, and its reliability largely determines the power supply quality of the power system. Improving the power supply reliability of the distribution network is an important research content to improve the power supply reliability of the power system. Traditional distribution network lines mostly adopt radiation power supply mode, there are no circuit breakers and control equipment at the branch points, and it takes a long time to restore power supply, which affects the reliability of distribution network power supply. In recent years, with the development of smart grid, "self-healing" will become the basic function of the grid, and the location of the fault sec...

Claims

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Application Information

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IPC IPC(8): G01R31/08G06F19/00
CPCY04S10/52
Inventor 宋国兵马志宾唐吉斯刘珮瑶刘术波刘健
Owner XI AN JIAOTONG UNIV
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