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Method for positioning single-phase grounding fault section of low-current grounding system

A single-phase grounding fault, small current grounding technology, applied in the fault location, detecting faults according to conductor types, measuring electricity and other directions, can solve the problems of difficult to directly extract, complex fault transient characteristics, etc.

Inactive Publication Date: 2020-06-02
CHONGQING UNIV
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  • Application Information

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Problems solved by technology

However, the transient characteristics of the fault are complex and difficult to extract directly, so it is necessary to use the identification algorithm to analyze and extract the characteristics of the electric field along the line

Method used

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  • Method for positioning single-phase grounding fault section of low-current grounding system
  • Method for positioning single-phase grounding fault section of low-current grounding system
  • Method for positioning single-phase grounding fault section of low-current grounding system

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Embodiment Construction

[0042] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0043] The technical scheme that the present invention solves the problems of the technologies described above is:

[0044] The basic idea of ​​the method of the present invention is to establish a calculation model of the space electric field of the distribution line, deduce the mathematical relationship between the electric field under the line and the line voltage, and determine the best measurement position of each measurement point along the line, so that the vertical electric field at the best measurement point is in line with the line voltage. The zero-sequence voltage is proportional to the fault transient electric field of each measurement point along the line, and the obtained transient electric ...

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Abstract

The invention discloses a method for positioning a single-phase grounding fault section of a low-current grounding system. The method belongs to the technical field of power supply and distribution line fault positioning, and specifically comprises the following steps of: establishing a distribution line space electric field calculation model, deriving a mathematical relationship between an offline electric field and a line voltage, and determining an optimal measurement position of each measurement point along a line, so that a vertical electric field at the optimal measurement point is in direct proportion to line zero-sequence voltage; acquiring a fault electric field of each measurement point along the line, preprocessing the electric field data, intercepting fault transient data, andremoving singular values from the fault transient data to form a new time domain electric field waveform; and calculating the time domain electric field waveform similarity of each adjacent measurement point by adopting a dynamic time warping (DTW) algorithm, and realizing fault section positioning by determining the measurement point with the lowest electric field waveform similarity. The methodis simple, reliable and high in accuracy rate.

Description

technical field [0001] The invention belongs to the technical field of power supply and distribution, and in particular relates to fault section location technology. Background technique [0002] Distribution lines have long distances, complex operating environments, and are prone to failures, of which single-phase ground faults account for about 80%. Due to the low-current grounding method, when a single-phase grounding fault occurs, the line enters a fault steady-state operation state after a short period of oscillation transition, the fault current is weak, the fault characteristics are complex, and fault location is difficult. Long-term fault steady-state operation may cause phase-to-phase short circuit, damage the insulation safety of distribution line equipment, and eventually lead to system power supply interruption. In recent years, all kinds of smart devices have been put into use, which put forward higher requirements for reliable and stable power supply, so accur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R29/14
CPCG01R29/14G01R31/085G01R31/088
Inventor 肖冬萍何滔赵文晗
Owner CHONGQING UNIV
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