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Self-adaption braking method for regional networked differential protection

A differential protection and adaptive technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problem that the braking characteristics of regional network differential protection need to be manually adjusted.

Inactive Publication Date: 2013-02-06
XJ ELECTRIC +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive braking method for regional network differential protection to solve the problem that the braking characteristics of regional network differential protection need to be manually adjusted

Method used

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  • Self-adaption braking method for regional networked differential protection
  • Self-adaption braking method for regional networked differential protection
  • Self-adaption braking method for regional networked differential protection

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Embodiment Construction

[0019] The structure of the regional power grid centralized network protection is composed of a centralized protection device, a communication network and an integrated intelligent unit installed locally. The main protection of the regional power grid centralized network protection adopts the principle of differential protection, and the backup protection adopts the differential protection with time limit. Regional networked differential protection adaptive braking method such as figure 1 As shown, the specific steps are as follows:

[0020] (1) The regional networked differential protection device establishes the associated link list of each network node according to the connection relationship of other network nodes in the differential protection associated with each network node in the regional network. The network node can be each branch connected to the bus. Circuit or branch circuit breaker, differential protection main protection and backup protection;

[0021] (2) Collect ...

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Abstract

The invention relates to a self-adaption braking method for regional networked differential protection (DP). The method comprises the following steps: creating an association link table of each network node according to connection relationships of other network nodes in DP associated with each network node in a regional network; collecting status quantity information and analog quantity information transmitted by each breaker, and calculating a variable quantity of the current of each network node; selecting the network node with the maximum variable quantity of the current as a fault point if an abnormal variation of the current of the network node is detected; acquiring the number of the network nodes associated with the fault point in the association link tables of the network nodes, and adaptively performing main back-up protection on the fault point to select a braking equation according to the numerical value; and if the equation is met, performing protection actions and tripping associated breakers off. In the method, different braking equations and braking coefficients are selected for protected objects adaptively according to the number of the network nodes in the DP, thereby ensuring enough sensitivity in different situations. In addition, no person is needed to participate in setting.

Description

Technical field [0001] The invention belongs to the technical field of power system relay protection, and relates to an adaptive differential protection braking method applied to centralized protection of regional power grids. Background technique [0002] In the area networked relay protection system, the current information of multiple measuring points can be easily obtained with the help of a high-performance and independent communication system. It can not only complete the differential protection function for independent electrical components, but also achieve multiple independent The differential protection function of the area composed of electrical components provides the power system with current differential protection with fast action speed, high sensitivity and excellent performance. [0003] The main and backup protection of the regional network protection adopts the principle of differential protection. The fault isolation range of the main protection is defined as al...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H7/22H02H3/26
Inventor 李旭倪传坤王莉杨恢宏王定国赵成功李文正李宝伟唐艳梅郝慧珍
Owner XJ ELECTRIC
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