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Bus differential protection reconstruction system and method

A busbar differential protection and differential protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of busbar loss protection, increase the risk of misoperation of busbar protection, and threaten the safety of power system, so as to ensure safety, The effect of reducing the risk of loss of protection and reducing the risk of misoperation

Pending Publication Date: 2021-01-22
NARI TECH CO LTD +5
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AI Technical Summary

Problems solved by technology

[0006] When the voltage transformer is disconnected, the voltage blocking condition of the bus differential protection is open, which increases the risk of misoperation of the bus differential protection; when the current disconnection transformer is disconnected, the bus differential protection is blocked, and the bus loses protection, threatening the safety of the power system

Method used

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  • Bus differential protection reconstruction system and method

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Embodiment Construction

[0034] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] A busbar differential protection reconfiguration system, comprising: first current transformers and second current transformers arranged sequentially from the busbar to the branch direction in each interval of the busbar differential protection, and first voltage transformers respectively arranged at both ends of the busbar a trans...

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Abstract

The invention discloses a bus differential protection reconstruction system and method. A first group of current transformers is formed through all spaced first current transformers of bus differential protection, and the first group of current transformers is connected with a first control module for the first group of differential protection; the bus voltage of the first group of differential protection is taken from the first voltage transformer and is used for judging the voltage locking of the first group of differential protection through the first control module; all the spaced second current transformers form a second group of current transformers, and the second group of current transformers is connected with the second control module and used for second group of differential protection; the bus voltage of the second group of differential protection is taken from the second voltage transformer, and is used for judging the voltage locking of the second group of differential protection through the second control module; and all spaces on the bus are jumped when any group of differential protection acts.

Description

technical field [0001] The invention relates to a reconfiguration system and method for bus differential protection, in particular to a reconfiguration method for bus differential protection after CT and PT disconnection based on double sampling information, and belongs to the technical field of bus differential protection reconfiguration. Background technique [0002] The secondary circuits of current and voltage transformers will have disconnection faults due to external force damage, environmental corrosion, wiring errors and other reasons in the on-site operating environment, resulting in the failure of relay protection to obtain correct sampling values. Existing protection devices mainly use information such as sequence components and current and voltage amplitudes measured on the spot to realize the judgment of disconnection faults. After a disconnection fault occurs, the relevant protections are often blocked, causing serious damage to the safe and stable operation of ...

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Application Information

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IPC IPC(8): H02H7/22H02H7/26
CPCH02H7/22H02H7/26
Inventor 王寅丞郑玉平吴通华戴魏朱翔张凯宇王鹤鸣常鑫瑞裘愉涛吴佳毅戚宣威黄晓明王松陈明罗华峰
Owner NARI TECH CO LTD
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