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Distribution network line fault type judging method based on voltage characteristics

A line fault and voltage characteristic technology, applied in the field of power grid, can solve problems such as electric shock for people and animals, line disconnection, etc.

Active Publication Date: 2019-05-10
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the construction height of the 10kV distribution network overhead line, it is easy to be damaged by external force and cause the line to be broken, or other foreign objects to overlap the line to conduct electricity and cause electric shock to humans and animals.

Method used

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  • Distribution network line fault type judging method based on voltage characteristics
  • Distribution network line fault type judging method based on voltage characteristics
  • Distribution network line fault type judging method based on voltage characteristics

Examples

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Embodiment Construction

[0087] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0088] Take the case of phase A failure as an example:

[0089] (1) When both sides are disconnected and not grounded: the phase and amplitude of the voltage on the power supply side remain unchanged, and the disconnected phase voltage on the load side becomes smaller and the phase is reversed from before the fault. It can be judged that the line is disconnected and not grounded. See the phase relationship figure 1 .

[0090] (2) After the wire is disconnected, the power supply side is grounded, and the load side is not grounded: the power supply side voltage fault phase becomes 0, the other two-phase voltage amplitude is 1.732 times the original value, the phase offset is 30 degrees, and the zero sequence voltage is the original phase A voltage The phase is opposite, the amplitude is the same, such as figure 2 Ua’, Ub’, U0, the load side ...

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Abstract

The invention relates to a distribution network line fault type judging method based on voltage characteristics, belonging to the field of electric power grids. The distribution network line fault type judging method based on the voltage characteristics is judging a fault phase and judging the grounding conditions of the power supply side and the load side according to the phase, amplitude, and voltage relationships between the power supply side and the load side. If the current is collected by means of a conventional method, the current at the time of the fault is small, and the precise action cannot be performed; and if an amplifier is used, when a slight change occurs in load or the like, it is easy to erroneously judge to be a fault. The invention utilizes the characteristics that thevoltage phase and the amplitude change greatly in various faults and the difference between the power supply side and the load side is large, which benefits mutual comparison and judgment of the faulttype through the voltage characteristics.

Description

Technical field [0001] The invention belongs to the field of electric power grids, and relates to a method for judging the fault type of a distribution network line based on voltage characteristics. Background technique [0002] Due to the height of the overhead line construction of the 10kV distribution network, it is easy to be damaged by external forces and cause line disconnection, or other foreign objects overlap the line to conduct electricity and cause electric shock to humans and animals. [0003] Due to the continuous development of communication technology and the mature application of terminal data collection and interactive analysis application technology, the line fault types can be compared and analyzed through the comparison of the voltage phase and amplitude relationship between the head and tail ends of the line to provide technical support for fault handling. Summary of the invention [0004] In view of this, the purpose of the present invention is to provide a met...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 廖清阳
Owner GUIZHOU POWER GRID CO LTD
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