NDLI: Breakdown characteristics of typical model in transformer oil under AC and DC mixed voltage

Content Provider	IEEE Xplore Digital Library
Author	Guan Lan Li Bo Cheng Huanchao Li Jinzhong Li Guangfan
Copyright Year	2012
Description	Author affiliation: IEEE Conference Publishing China Electric Power Equipment and Technology Co., Ltd, Beijing 100052 P.R. China (Li Guangfan) \|\| IEEE Conference Publishing China Electric Power Research Institute, Beijing 100192 P.R. China (Guan Lan; Li Bo; Cheng Huanchao; Li Jinzhong)
Abstract	In the HVDC transmission system, the valve side insulation of the converter transformer endures the AC and DC voltage simultaneously, and that could cause insulation failures in the converter transformer. Unfortunately, there is no method to simulate its working condition, so AC and DC test voltage are respectively imposed on the transformer during the factory test. There is a lack of research on the influences of AC and DC mixed voltage on the oil-pressboard insulation characteristics. In this paper a needle-plate electrode model is designed, and different values of AC and DC mixed voltage are imposed on the oil surrounded needle-plate electrode model to study the differences of breakdown characteristics. The test reveals different effects of AC and DC voltage component on the insulation model breakdown characteristics. The results indicate that, the AC breakdown voltage value decreases linearly as the DC pre-voltage value increases and vice versa. In addition, different pre-applied voltages affect the test results remarkably, that is, the breakdown voltage value under AC pre-voltage is higher than that under DC pre-voltage.
Starting Page	403
Ending Page	406
File Size	531965
Page Count	4
File Format	PDF
ISBN	9781467312530
ISSN	00849162
e-ISBN	9781467312523
e-ISBN	9781467312516
DOI	10.1109/CEIDP.2012.6378805
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-14
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric breakdown Breakdown voltage Oil insulation Power transformer insulation HVDC transmission Electrodes
Content Type	Text
Resource Type	Article

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