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Method and device for improving current quick-break protection sensitivity of power distribution line

A technology for quick current breaking and power distribution lines, which is applied to circuit devices, emergency protection devices for automatic disconnection, emergency protection circuit devices, etc., can solve problems such as insufficient sensitivity of power distribution lines, achieve simple judgment methods, and improve sensitivity Effect

Inactive Publication Date: 2019-03-12
STATE GRID CORP OF CHINA +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method and device for improving the sensitivity of the current quick-break protection of distribution lines, which is used to solve the problem of insufficient sensitivity of the current quick-break protection of distribution lines

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  • Method and device for improving current quick-break protection sensitivity of power distribution line

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The flow chart of the method for improving the sensitivity of the current quick-break protection of distribution lines in the present invention is as follows figure 1 As shown, it specifically includes the following steps:

[0022] (1) Set the current quick-break protection setting value of the distribution line according to the three-phase symmetrical fault, that is, the operating current setting value of the distribution line current quick-break protection is set using the three-phase fault characteristics.

[0023] (2) Collect the fault current to judge whether the line fault type is a two-phase-to-phase fault.

[0024] Because the distribution network is generally a small current grounding system, the protection does not respon...

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Abstract

The invention relates to a method and a device for improving the current quick-break protection sensitivity of a power distribution line. The method comprises the following steps of setting a currentquick-break protection constant value of the power distribution line according to a symmetric three-phase fault; and judging whether the fault type of the line is an inter-two-phase fault or not, andif yes, reducing the current quick-break protection constant value. According to the method, self-adaptive adjustment is carried out on an action current setting value of current quick-break protection according to the fault type of the power distribution line, namely, the current quick-break protection constant value is set according to the three-phase fault, and when the fault type of the line is the inter-two-phase fault, the current quick-break protection constant value is self-adaptively reduced, so that the current quick-break protection sensitivity of the power distribution line is effectively improved.

Description

technical field [0001] The invention relates to a method and a device for improving the sensitivity of current quick-break protection of distribution lines, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] The fault type and operation mode are the main factors affecting the current quick-break protection. In order to ensure the selectivity of the current quick-break protection, the setting value of the current quick-break protection should be based on the fault current of the three-phase short-circuit at the next line outlet when avoiding the maximum operation mode. In the operation mode, the minimum protection range should not be less than 15% of the total length of the line when two phases are short-circuited. However, when the line length is too short, the current quick-break protection selectively set according to the three-phase short-circuit fault priority protection will have insufficient sensitivity and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H02H3/00
CPCH02H3/006H02H3/083
Inventor 张志华刘健张小庆刘星吴水兰孟乐杨振良毛林王龙韩宇李鹤邱舵冀娟黄蔚孙文龙
Owner STATE GRID CORP OF CHINA