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CT broken line discrimination method during bus protection

A technology of busbar protection and discrimination method, which is applied to emergency protection circuit devices, fault locations, electrical components, etc., can solve the problems of high device complexity, increased affected factors, and reduced reliability, so as to achieve simplified devices and reduced affected factors , The effect of reliability improvement

Inactive Publication Date: 2014-02-12
BAOSTEEL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology has the following problems. This technology uses voltage, and the voltage loop also has a disconnection problem similar to the current loop. The number of affected factors increases, and the complexity of the device is high, the cost increases, and the reliability is greatly reduced.

Method used

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  • CT broken line discrimination method during bus protection
  • CT broken line discrimination method during bus protection
  • CT broken line discrimination method during bus protection

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Please combine image 3 As shown, the CT disconnection discrimination method in the busbar protection of the present invention specifically includes the following steps:

[0023] A. Set a bus protection device with current sequence component discrimination element and logic configuration element for the bus, and make the CT input of each unit of the bus protection device and the current transformer output of each incoming line, section, and outgoing line on the bus line Secondary cable media connection;

[0024] B. Utilize the functions of the busbar protection device itself to collect the CT current operating parameters of each unit in real time and conduct over-current discrimination;

[0025] C. If a unit of the busbar protection device has both zero-sequence overcurrent and negative-sequence overcurrent, and ot...

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Abstract

The invention discloses a CT broken line discrimination method during bus protection. The CT broken line discrimination method determines whether a CT broken line fault occurs during bus protection by determining current fault components such as zero sequence and negative sequence currents of each unit of a protection device connected with a bus, one specific unit which has the fault can be accurately determined, so a broken line problem of a voltage loop because of voltage acquisition is avoided like a current loop, influence factors are reduced, the device is greatly simplified, cost is reduced, and reliability is improved.

Description

technical field [0001] The invention relates to busbar protection technology, more specifically, to a method for judging CT disconnection in busbar protection. Background technique [0002] The bus bar refers to the equipment made of copper and aluminum materials with good electrical conductivity to distribute and transmit electric energy. Through the busbar, the electric energy output by generators, transformers, etc. can be transmitted to various users or other substations / distribution stations. [0003] Busbar protection is an important device to ensure the safe and stable operation of the power grid. Its safety, reliability, sensitivity and rapidity are of decisive significance to ensure the safety and stability of the entire regional power grid. [0004] So far, bus coupler current ratio differential protection, current phase comparison differential protection, and ratio brake differential protection, which have been widely used in power grids, have been summed up by v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 陈其伟何中炜
Owner BAOSTEEL STAINLESS STEEL
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