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Differential protection method of regional power grid network change range

A differential protection, regional power grid technology, applied in emergency protection circuit devices, electrical components and other directions, can solve problems such as the main protection can not work normally

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

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to solve the problem that the main protection will not work normally when the current transformer of the protected object in the regional power grid is abnormal, so as to propose a differential protection method with variable range in the regional power grid network

Method used

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  • Differential protection method of regional power grid network change range
  • Differential protection method of regional power grid network change range
  • Differential protection method of regional power grid network change range

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Embodiment Construction

[0011] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0012] Such as figure 1 When a fault occurs on the line L1, but the data of CT1 is unavailable due to various reasons, when the bus protection of substation 1 recognizes that the data of CT1 is abnormal, the data of CT2 is used instead of the data of CT1 to participate in the calculation of the bus differential protection of substation 1 , which is the variable range differential protection. When the protection operates, the circuit breaker of CT1 is tripped in the first time limit, and the circuit breaker of CT2 is also tripped at the same time, and all circuit breakers of substation 1 are tripped in the second time limit. The calculation formulas of differential current and braking current of variable range differential protection are:

[0013] I CDI ...

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Abstract

The invention relates to a differential protection method of a regional power grid network change range, wherein bus differential protection with expanded range in the invention is used as bus, circuit and standby protection of the high voltage side of a transformer, when a current transformer of one element abnormally samples, and a related current transformer on the opposite side of the element is used for replacing the current transformer of the element participate in the bus differential protection; if the current transformers on the sides of a protected object are abnormal, for example, the current transformers on the two sides of the circuit are abnormal, the bus differential protection on the two sides of the circuit directly eliminates the related ports of the protected object to perform differential protection calculation. After the variable-range differential protection, a circuit breaker at the abnormal end of the current transformer is turned off at a first time limit, and the circuit breakers at all ports are turned off at a second time limit. The differential protection method provided by the invention is used for guaranteeing the main protection can normally work when the current transformer of the protected target in the regional power grid is abnormal.

Description

technical field [0001] The invention relates to a differential protection method for the variable range of a regional power grid network, which belongs to the field of relay protection of electric power systems. Background technique [0002] The development of smart grid technology has promoted the update of relay protection technology. The networked centralized protection device of the regional power grid is to centralize the relay protection functions of the entire regional power grid into the CPU of a physical device. The centralized protection device configures main differential protection for each electrical component in the power grid, including bus differential protection, line differential protection, and main transformer differential protection. When the current transformer of the protected object is abnormal, its main protection will not work normally, and it is necessary to configure a backup protection when the main protection cannot cut off the fault. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02H7/26
Inventor 倪传坤吴双惠刘永华赵成功张新萍冉志勇原琳李书圣都磊
Owner XJ ELECTRIC
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