NDLI: Analysis of the breakdown fault in field voltage withstand test of 500kV SF6 current transformer

Content Provider	IEEE Xplore Digital Library
Author	Yongji Zhang Yongming Wang Haitao Huang Guoshun Zheng Zhijin Zhang
Copyright Year	2012
Description	Author affiliation: Maintenance Branch Company of Fujian Electric Power Co., LTD, 361000, China (Yongji Zhang; Yongming Wang; Haitao Huang; Guoshun Zheng) \|\| State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University, 400044, China (Zhijin Zhang)
Abstract	Current transformer, the major primary equipment in power system, can transform a large primary current into the standard 5A or 1A current. It provides current for the measure device and the coil of relay protection, meanwhile makes the primary equipments isolate from the secondary equipments. With the development of grid, SF6 current transformers have been widely used. Once the fault of the internal insulation support in SF6 current transformer appears, it will threat the safe operation of power systems. In recent years, the fault accidents of current transformer have occurred form time to time. This paper introduces the fault conditions of 500kv current transformer in the area under the jurisdiction of Xiamen EHV Power Transmission and Transformation Bureau. After it be sent back to factory and disassembled, we found that many large area of paint have come off the inner surface of shell of the current transformer, and that there many blister on the inner surface of shell. Meanwhile, send the same batch transformers back to the factory and disassemble, we found that there are many problems in the production process. So this paper suggests that the production process of SF6 current transformer should be monitored. And after it has been installed, we have to do the aging test and voltage withstand test. To prevent the same fault of 500kv current transformer occurs again, the results in this paper can give some reference and engineering application consult.
Starting Page	518
Ending Page	522
File Size	291830
Page Count	5
File Format	PDF
ISBN	9781467347471
e-ISBN	9781467347464
DOI	10.1109/ICHVE.2012.6357040
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-17
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Substations Current transformers Sulfur hexafluoride Circuit faults Paints Surface treatment
Content Type	Text
Resource Type	Article

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