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Single-phase earth fault isolation system and method for electrical distribution network

A single-phase ground fault and isolation system technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve the problems of wasting manpower and material resources, and cannot quickly isolate the fault section, so as to ensure reliability and practicability Effect

Inactive Publication Date: 2011-05-25
ZHUHAI XJ ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] According to the statistics of the power department, more than 80% of the power outages of users are caused by faults in the distribution network. The existing 10KV distribution network has the characteristics of complex structure, numerous branches, and wide distribution areas. For example, when a single-phase ground fault occurs In this case, the entire line must be selected and isolated based on the line selection device of the substation or the working experience of the operating staff, and then manually check and isolate the faulty section section by section. Obviously, this method will cause a large-scale power outage on the entire line and cannot be quickly resolved. Isolating the faulty section of the line also wastes a lot of manpower and material resources

Method used

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  • Single-phase earth fault isolation system and method for electrical distribution network
  • Single-phase earth fault isolation system and method for electrical distribution network
  • Single-phase earth fault isolation system and method for electrical distribution network

Examples

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Embodiment 1

[0021] Such as figure 1 As shown, the distribution network single-phase ground fault isolation system in this embodiment includes a substation (not shown in the figure) and several overhead lines connected to the substation, taking line one and line two as examples, in the The beginning of the overhead line is provided with an outlet circuit breaker DL for isolating the overhead line, and several automatic switches PVS are distributed sequentially from the beginning to the end of the overhead line, and the several automatic switches PVS separate the overhead line into different line areas Sections (A, B, C, and D in the figure); on the lines on both sides of each automatic switch PVS, there are zero-sequence voltage transformers PT, corresponding to each automatic switch PVS is equipped with a transformer substation Communication remote control terminal RTU, the remote control terminal RTU is used to control the input and opening of the automatic switch PVS, and the zero seque...

Embodiment 2

[0027] Such as image 3 As shown, in this embodiment, the system includes several overhead lines, wherein at least two overhead lines (line one and line two), the ends of the two overhead lines are connected with a tie switch PVS to form a loop, and in the tie switch The lines on both sides of the PVS are respectively equipped with zero-sequence voltage transformers PT, corresponding to the tie switch PVS is also equipped with a remote terminal RTU for controlling the input and opening of the tie switch, and the zero-sequence voltage transformers on both sides The zero-sequence voltage signal of the PT is sent to the remote control terminal RTU, where the tie switch PVS has the same function as the automatic switch PVS of each section of the line, and the segmental equipment on each line is the same as that of the first embodiment.

[0028] Under normal circumstances, except for the contact switch PVS which remains normally open, the rest of the automatic switches PVS have bee...

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Abstract

The invention discloses a single-phase earth fault isolation system and method for an electrical distribution network. The process for processing single-phase earth faults is completed by relying on the mutual coordination of an automatic PVS (Ported Vacuum Switch), a remote terminal unit (RTU) and a zero-sequence potential transformer (PT) in the system. The RTU controls the automatic PVS to be switched on or off according to voltage-type timesequence protecting principle. If the zero sequence voltage of a line is not detected in a first confirming time before the automatic PVS is switched on, no fault exists in the line on the power supply side; and if the zero sequence voltage of the line is detected in a second confirming time after the automatic PVS is switched on, a single-phase earth fault exists on the load side of the automatic PVS; and the RTU controls the automatic switch to be switched off and be locked so as to isolate a single-phase earth fault section.

Description

technical field [0001] The invention relates to a single-phase grounding fault isolation system and method of a distribution network. Background technique [0002] According to the statistics of the power department, more than 80% of the power outages of users are caused by faults in the distribution network. The existing 10KV distribution network has the characteristics of complex structure, numerous branches, and wide distribution areas. For example, when a single-phase ground fault occurs In this case, the entire line must be selected and isolated based on the line selection device of the substation or the working experience of the operating staff, and then manually check and isolate the faulty section section by section. Obviously, this method will cause a large-scale power outage on the entire line and cannot be quickly resolved. Isolating the fault section of the line also wastes a lot of manpower and material resources. Contents of the invention [0003] The techni...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J13/00
CPCY02E60/723Y04S10/20Y02E60/725Y04S10/16Y02E60/00
Inventor 陈立新朱汉平李京平
Owner ZHUHAI XJ ELECTRIC