Discrimination of ground fault line in multi-level power supply network system

A technology of power supply network and ground fault, applied in the direction of fault location, etc., can solve problems such as accident expansion, and achieve the effect of avoiding accident expansion.

Active Publication Date: 2011-12-14
内蒙古蒙能建设工程监理有限责任公司
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  • Abstract
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  • Claims
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Problems solved by technology

If the operator makes a wrong judgment, it will cause the problem of expansion of the accident

Method used

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  • Discrimination of ground fault line in multi-level power supply network system
  • Discrimination of ground fault line in multi-level power supply network system
  • Discrimination of ground fault line in multi-level power supply network system

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described below through specific examples. Such as figure 2 As shown in FIG. 1 , it schematically shows the configuration of the various levels of small current line selection devices of the present invention. Compared with the independent working mode of the small current line selection devices at all levels in the prior art, in the embodiment of the present invention, the alarm signals of the small current line selection devices of each power supply section are summarized and managed uniformly by using computer communication technology, And establish a line selection signal logic judgment module in the computer. After receiving the alarm signals from the small current line selection devices at all levels, the line selection signal logic judgment module accurately determines which line has failed according to the logic judgment method.

[0024] Such as image 3 As shown, the logic judgment method in th...

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Abstract

The invention discloses a system for judging grounding fault and a method for judging grounding fault in a multi-stage power supply network. The multi-stage power supply network is a N-stage power supply network; the system comprises low current line selection devices arranged in a distribution section of each stage of power supply network, a first to a N-th stage low current line selection devices are formed; the system further comprises a grounding line selection logic control device, the first to the N-th stage low current line selection device are respectively and independently connected with the grounding line selection logic control device through optical fibre. According to the judging method, the grounding alarm signal of multi-stage power supply network grounding line selection device is managed uniformly, and then which stage and which circuit has the grounding fault is accurately judged, and the grounding line is directly founded out.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to the discrimination of ground fault lines in multi-level power supply network systems in industrial parks or substations. Background technique [0002] In a system whose neutral point is directly grounded, when a single-phase ground fault occurs, the grounding short-circuit current is very large. This system is called a large current grounding system. Generally, the system of 110kV and above adopts a large current grounding system. In a system where the neutral point is not grounded or is grounded through the arc suppression coil, when a single-phase ground fault occurs, since no short-circuit circuit is formed, the grounding short-circuit current is much smaller than the load current. This system is called a small current grounding system. [0003] Such as figure 1 As shown in FIG. 1 , a schematic structural diagram of a multi-level power supply network system is shown...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 蔡红军邬超慧白文光聂维新王乐天
Owner 内蒙古蒙能建设工程监理有限责任公司
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