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Self-adapting voltage quick-break protection method of distribution circuit

An adaptive voltage and quick-break protection technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve problems such as long time delay and large amount of calculation

Inactive Publication Date: 2014-12-10
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the disadvantages of traditional adaptive current quick-break protection principle, such as cumbersome power frequency extraction algorithm, large calculation amount and long delay, and provides a time-domain-based distribution line adaptive voltage quick-break protection method

Method used

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  • Self-adapting voltage quick-break protection method of distribution circuit
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  • Self-adapting voltage quick-break protection method of distribution circuit

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] 1) Cooperate with the directional element, when the directional element judges that the fault occurs in the forward direction of the line, the directional element sends a signal to start the protection; when the directional element judges that the fault occurs in the reverse direction of the line, it sends out a signal to block the protection;

[0056] 2) After the protection starts, the line current and voltage are sampled at the place where the protection is installed; the effective value of the three-phase fault voltage component is obtained according to the sampling results of the three-phase voltage, and the fault phase is selected according to the effective value.

[0057] The basic idea of ​​using voltage value for fault phase selection is: according to the sampling result u of the three-phase voltage at the measurement point mA (t), u mB (t) and u mC (...

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Abstract

The invention provides a self-adapting voltage quick-break protection method of a distribution circuit. The method is realized in a time domain, a troublesome power frequency quantity extraction algorithm is effectively avoided, the data window needing calculaing is short, the calculated amount is small, the protective movement speed is greatly increased, and the quick operated requirement is met; and a protection principle has very strong adaptivity, and the self-adapting voltage quick-break protection method of the distribution circuit provided by the invention has the advantages of being not influenced by a failure mode and a system operation mode. The self-adapting voltage quick-break protection method of the distribution circuit provided by the invention is mainly used for relay protection of the distribution circuit of an electric system.

Description

technical field [0001] The invention relates to the field of relay protection for power system distribution lines, in particular to a method for self-adaptive voltage quick-break protection of distribution lines. Background technique [0002] The distribution network is the final link of power generation, transmission and distribution in the power system. Since it is directly connected to the user, when the distribution network fails, if the corresponding protection device cannot quickly and accurately isolate the fault, the area of ​​the power outage will expand, and The recovery of power supply becomes slow, so whether the distribution network is equipped with a complete relay protection device is the key to ensuring reliable power supply to users, and the distribution line is more prone to failure in the distribution network, so the distribution line relay protection device Completeness determines the safe and reliable operation of the entire distribution network. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 宋国兵田小强赵林平王显峰贾鹏飞饶菁
Owner XI AN JIAOTONG UNIV
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