T line protection scheme fit for distributed electrical connection

A technology of distributed power supply and connection line, which is applied in the direction of emergency protection circuit devices and electrical components, etc., and can solve problems such as protection blind areas, poor tolerance to transition resistance, protection malfunction and refusal to operate, etc.

Inactive Publication Date: 2016-06-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

[0009] (2) The combination of the three-terminal line lengths of the T-connection line is complex and diverse. When the lengths of the three lines are very different, such as two lines being extremely short and one line being extremely long, the distance section I is still set according to 80% of

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  • T line protection scheme fit for distributed electrical connection
  • T line protection scheme fit for distributed electrical connection
  • T line protection scheme fit for distributed electrical connection

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[0060] The present invention is based on the complexity and particularity of T-connection line protection. Aiming at the problems of the traditional single setting and configuration principle of relay protection in the application of T-connection lines, a comprehensive criterion of relay protection is proposed. The various length combinations of the multi-terminal line of the line are applicable, which effectively improves the ability of the distance protection to withstand the transition resistance, and ensures the selection of the action of the relay protection under various T-connection line combinations and various asymmetric ground faults. Speed, speed and reliability.

[0061] A T-connected line protection scheme suitable for distributed power access. The main criterion can effectively distinguish between in-area faults and out-of-area faults when the T-connected line is combined with different line lengths, and is not affected by transition resistance. The analysis process...

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Abstract

The invention belongs to the technical field of power system relay protection and especially relates to a T line protection scheme fit for distributed electrical connection. The T line protection scheme is characterized in that a distance protection starting element acts after the fault occurs; if the inaction condition for main criterion is not met, the trip protection is performed through zero sequence voltage amplitude difference, and if not, the distance section-II protection can be used for judging the fault direction; if section-II measuring elements at three ends are judged as positive direction fault and the acting condition of auxiliary criterion section-I protection is met, the trip protection is performed through the distance section-I protection at three ends; if the acting condition of auxiliary criterion section-I protection is not met, the section-II protection at three ends is delayed and then is tripped out; if two section-II measuring elements judge as positive direction fault and one section-II measuring element judges as negative direction fault, a locking signal is sent to section-I protection at the opposite end by the negative direction fault end and the section-I protection at three ends all shall not trip out. According to the T line protection scheme fit for distributed electrical connection, the active criterion and the auxiliary criterion are organically matched and formed into a comprehensive criterion, so that the selectivity, sensitivity and reliability of the T line protection can be ensured.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a T-connection line protection scheme suitable for accessing distributed power sources. Background technique [0002] With the rapid development of social economy, the user's demand for power supply has increased significantly. Due to the limitation of power supply radius and power supply corridor, etc., and in order to save equipment investment and ensure power supply, the nearest T-connected outgoing line or step-down transformer is more and more common in 35kV and 110kV systems, resulting in many three-terminal or even four-terminal line. The longest of these lines is 30km, and the shortest is several hundred meters. The emergence of multi-terminal transmission lines has brought many adverse effects to the design and operation of relay protection, which makes the traditional medium and low voltage protection configuration more diffi...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 郑涛赵裕童王燕萍李菁魏旭辉王增平陈璨吴林林刘辉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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