NDLI: Researches on relay misoperation effected by the earth capacitance

Content Provider	IEEE Xplore Digital Library
Author	Qiangchao Xu Wendong Jiang Qi Wang Yongxiang Li
Copyright Year	2015
Description	Author affiliation: Coll. of Inf. Sci. & Eng., Wuhan Univ. of Sci. & Technol., Wuhan, China (Qi Wang) \|\| Guangzhou Power Supply Bur., Guangzhou, China (Qiangchao Xu; Wendong Jiang) \|\| Guangzhou qianshun Electron. Equip. Co., Ltd., Guangzhou, China (Yongxiang Li)
Abstract	Under some grounding states, the substation's DC system works well, but the switching processes of the insulation resistance bridge in monitoring device might lead to a relay misoperation, that is, such an operation may generate a voltage fluctuation of the relay and when the maximum voltage value exceeds the protection value, the relay will misoperate. When state changes, the earth capacitance will charge or discharge, the influence caused by earth capacitance to the voltage fluctuation has been researched. The maximum value of voltage fluctuation is calculated using the Laplace transform. Then DC system has been simulated in RT-LAB, as the earth capacitance value in the system changes from small to large, the voltage changes as well, so the relationship curves of them are gotten to expose the influence on the maximum relay voltage fluctuation made by the earth capacitance. At the end, experiments are carried out to support the simulation results.
Starting Page	1237
Ending Page	1241
File Size	1517932
Page Count	5
File Format	PDF
e-ISBN	9781467371896
DOI	10.1109/CAC.2015.7382688
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-11-27
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistance Insulation Power measurement Substations Grounding Misoperation DC System Bridge circuits Earth capacitance Relays
Content Type	Text
Resource Type	Article

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