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
CN104393567BInactive Publication Date: 2017-08-29XUJI GRP +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XUJI GRP
Publication Date
2017-08-29
Estimated Expiration
Not applicable · inactive patent

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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.
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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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