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A Distributed Transformer Differential Protection Method

A distributed transformer and differential protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of lower sensitivity of the main transformer differential protection, achieve the effects of eliminating unbalanced current, improving sensitivity, and low cost

Inactive Publication Date: 2017-08-29
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a distributed transformer differential protection method to solve the problem that the sensitivity of the main transformer differential protection is reduced due to the change of the position of the voltage regulating switch of the transformer

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  • A Distributed Transformer Differential Protection Method
  • A Distributed Transformer Differential Protection Method
  • A Distributed Transformer Differential Protection Method

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Embodiment Construction

[0029] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 Shown is the configuration diagram of the distributed transformer protection device of the present invention. Taking a three-turn transformer as an example, the transformer includes a high-voltage side, a medium-voltage side and a low-voltage side, and each side is equipped with a corresponding protection device; each side protection device is also connected with a The comprehensive protection devices are connected, and each protection device is interconnected in pairs; the protection devices on each side are used to complete the backup protection function of this side, including complex voltage overcurrent protection, zero sequence overcurrent protection, impedance protection and low-voltage side simple bus protection. Differential protection, etc.; the comprehensive protection device is used to complete the functions ...

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Abstract

The invention discloses a differential protection method for a distributed transformer. A decentralized collection mode is adopted for analog quantity and switch quantity of a distributed transformer protection device; backup protections of the transformer are arranged on different sides and are independent; differential protection is realized by an individual comprehensive protection device; a differential protection balance coefficient is automatically adjusted according to an actual gear of a voltage regulation switch; differential protection calculation and logic identification are performed on synchronized sampled values of all the sides and the adjusted balance coefficient by the comprehensive protection device; differential protection is transmitted to the protection device on each side and tripping is performed after the differential protection is acted. Unbalance current caused by gear adjustment can be eliminated after the balance coefficient of the differential protection is adjusted according to the actual gear of the voltage regulation switch, so that the sensitivity of main transformer differential protection is improved. The method is simple and practical, is low in manufacturing cost and is suitable for a locally mounted transformer protection.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a distributed transformer differential protection method. Background technique [0002] The development trend of smart substations in the future should be compact and equipment integration. Especially due to the shortage of land resources in newly built substations in urban areas, the protection equipment will be lowered to the local switch cabinets, integrated and installed with primary equipment, and the secondary protection screen cabinets in the station will be canceled. The reduced footprint has significant economic benefits. Due to the characteristics of transformer protection across intervals and voltage levels, transformer protection has always been installed in a centralized group of screens, which has become the last obstacle to completely cancel the secondary protection screen cabinet in the substation. In the existing transf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045
Inventor 邓茂军倪传坤余高旺张项安金全仁樊占峰席颖颖
Owner XUJI GRP
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