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Single phase grounding failure positioning method and device of neutral point non direct grounding power grid

A single-phase ground fault, non-direct grounding technology, applied in the direction of fault location, emergency protection circuit devices, electrical components, etc., can solve the problems that cannot adapt to the development requirements of automatic identification and isolation of feeder automation fault sections, and improve automatic operation Level, the effect of guaranteeing power supply

Inactive Publication Date: 2007-08-15
耿玉泉 +1
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Problems solved by technology

The above-mentioned patent application and the existing single-phase ground fault protection that has been put into practical use can only realize the line selection function of ground faults. Generally, it is necessary to collect and compare the power information of each outgoing line to determine the single-phase ground fault line, which cannot be adapted to automatic fault areas of feeders. Development Requirements for Segment Automatic Identification and Isolation

Method used

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  • Single phase grounding failure positioning method and device of neutral point non direct grounding power grid
  • Single phase grounding failure positioning method and device of neutral point non direct grounding power grid

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0033] As shown in Figure 1, when a single-phase ground fault occurs at point d1, the implementation method of the single-phase ground fault location device of the neutral point indirect ground distribution system is as follows:

[0034] (1) When a single-phase ground fault occurs in the power distribution system with an ungrounded neutral point as shown in Figure 1: first, the monitoring terminal RV of the bus voltage transformer in the substation detects that the open delta output voltage of the bus voltage transformer in the substation reaches the pre-set value The busbar transformer monitoring terminal RV notifies the host MA system of a single-phase ground fault through GPRS / GSM wireless communication, and then the host MA notifies all substation switch monitoring control terminals ZD1, ZD2, ... ZDn to intercept and store the moment when the faul...

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Abstract

The disclosed neutral-point indirect-grounding power network single-phase grounding fault location method comprises: all monitor control terminals are assembled on the distribution line switch or raing main unit, simultaneous collects and records the instant line zero-sequence current message before and after the fault to send to the host for analysis and find out the fault segment to isolation. This invention can fast diagnose fault segment to ensure normal power supplying.

Description

technical field [0001] The invention relates to a rapid location and restoration of power supply for single-phase grounding or short-circuit faults in a power grid, in particular to a method and device for locating single-phase grounding or interphase short-circuit faults in a neutral point indirect grounding power grid, belonging to the technical field of power supply. Background technique [0002] my country's 66 kV and below power grid (also known as power distribution system) generally adopts the neutral point indirect grounding operation mode (that is, the neutral point is not grounded or the neutral point is grounded through the arc suppression coil). In the neutral point indirect grounding operation system, when a single-phase ground fault occurs, it is difficult to completely solve the single-phase ground fault due to the characteristics of small fault current and unstable grounding caused by arc light. How to quickly determine the fault location of the line and quic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 耿玉泉刘更新
Owner 耿玉泉
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