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A scheme for automatic isolation and reclosing of single-phase ground faults in small current grounding systems

A single-phase ground fault and low-current grounding technology, which is applied in the direction of automatic disconnection emergency protection devices, electronic switches, electrical components, etc., to achieve the effect of ensuring reliable power supply, accurate processing, and power supply reliability

Active Publication Date: 2020-04-07
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the processing problem of single-phase grounding fault in the small current grounding system, and provide a small current grounding fault automatic isolation and reclosing implementation scheme applicable to different feeder automation modes

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  • A scheme for automatic isolation and reclosing of single-phase ground faults in small current grounding systems
  • A scheme for automatic isolation and reclosing of single-phase ground faults in small current grounding systems
  • A scheme for automatic isolation and reclosing of single-phase ground faults in small current grounding systems

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Embodiment Construction

[0028]To achieve the above object, the present invention intends to realize with the following technical solutions:

[0029] Ⅰ. When the feeder terminal is the local voltage-time type, the basic idea of ​​small current grounding fault handling is: if the grounding fault is located downstream of the boundary switch, the boundary switch will trip with a delay action to remove the fault, and the tripping of the outlet protection device will be delayed If the fault does not arrive, the fault disappears, the protection returns, and the voltage-time feeder terminal does not act; if the ground fault is located upstream of the boundary switch, the fault is located outside the protection range of the boundary switch, and the protection of the boundary switch does not operate. The line type, overvoltage level, fault type and other factors adapt to the trip time, and delay trip, cooperate with the voltage time type feeder terminal and outlet protection device to automatically reclose, cut...

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Abstract

The invention discloses a scheme for automatically isolating and reclosing single-phase-to-ground faults of a small-current grounding system. A Voltage-Time type, a centralized control type and a distributed control type of time setting are configured, and the corresponding tripping delay setting of boundary switch protection device, tripping delay time of outgoing line protection device and automatic reclosing delay time setting of outgoing line protection device are configured respectively. The invention solves the problem of timing coordination of tripping of the outgoing line protection device, the feeder terminal and the demarcation switch protection device when the single-phase grounding fault occurs in the small current grounding system and the configuration problem of reclosing, and realizes fast and accurate isolation of the small current grounding fault.

Description

technical field [0001] The invention relates to a small-current grounding fault processing method, which is suitable for a power distribution system in a small-current grounding mode, and belongs to the field of distribution network fault protection. Background technique [0002] my country's 6-35kV medium-voltage distribution network mostly adopts the low-current grounding method. After a single-phase ground fault occurs in the small-current grounding system, the past regulations allow the system to continue to operate with a fault for a period of time (1-2h) to improve power supply reliability and reduce Small power outage losses, but at the same time there are greater security risks. Intermittent arcing ground faults that are common in the field will generate large overvoltages. If the system operates with faults for a long time, there will inevitably be weak insulation points in the power grid. Large overvoltages may cause insulation flashover or breakdown, causing Two-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/06H03K17/28
CPCH02H3/066H02H7/26H03K17/28
Inventor 张林利张世栋李立生孙勇邵志敏刘合金樊迪任杰文艳孟海磊房牧刘明林李建修向珉江刘洋王峰苏国强
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY