DocumentCode :
3011978
Title :
The electric field distribution in oil-paper insulation under combined AC-DC voltage
Author :
Hao Wu ; Chengrong Li ; Bo Qi ; Xiaolin Zhao ; JinZhuang Lv ; Linjie Zhao
Author_Institution :
Beijing Key Lab. of High Voltage & EMC, North China Electr. Power Univ., Beijing, China
fYear :
2012
fDate :
23-27 Sept. 2012
Firstpage :
1097
Lastpage :
1101
Abstract :
The valve winding in the converter transformer withstands several types of voltage, including the AC, DC, and the combined AC-DC voltage. It is important to consider the effects of voltage type to the electric field distribution. In this paper, a combined AC-DC source was constructed. The electric field distribution of oil paper insulation model was measured by Kerr electro-optic effect, under combined AC-DC voltage with different composite ratios of DC/AC. The results indicate that: 1) DC electric field distribution is asymmetric, which is caused by the difference of the charge accumulation status in different area. The electric field intensity in the left area accumulated negative charge is lower than that in the right area accumulated positive charge. 2) AC electric field distribution depends on the geometric structure and is symmetric. 3) The AC electric field intensity rises with the increase of AC component linearly. However, the relationship of the DC electric field and the DC component is complicated and non-linear in most area.
Keywords :
Kerr electro-optical effect; paper; transformer oil; transformer windings; DC component; Kerr electro-optic effect; charge accumulation status; combined AC-DC voltage; converter transformer; electric field distribution; electric field intensity; left-area-accumulated negative charge; oil-paper insulation model; right-area-accumulated positive charge; valve winding; Electric fields; Insulation; Power transformer insulation; Valves; Voltage measurement; Windings; Kerr effect; combined AC and DC voltage; composite ratios; converter transformer; oil paper insulation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Condition Monitoring and Diagnosis (CMD), 2012 International Conference on
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1019-2
Type :
conf
DOI :
10.1109/CMD.2012.6416349
Filename :
6416349
Link To Document :
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