TY - GEN
T1 - Study on space charge characteristics of oil-paper insulation at breakdown moment
AU - Wei, Yan Hui
AU - Wang, Da
AU - Mu, Hai Bao
AU - Zhang, Guan Jun
PY - 2013
Y1 - 2013
N2 - During the long-term operation of electrical equipment of HVDC system, accumulated space charge in oilpaper insulation can greatly distort the local electric field, which can cause the aging and breakdown of the equipment. Therefore, it is important to understand the influence of the space charge on breakdown characteristics of oil-paper insulation dielectrics under DC voltage. In this paper, four kinds of oil-paper samples with different aging status are obtained by accelerating thermal aging. At room temperature, each sample is applied with DC voltage till breakdown. During the processes of the breakdown, the space charge distribution is measured using pulsed electro-acoustic (PEA) method, and space charge distribution is analyzed at the breakdown moment. The experimental results show that positive space charge moved towards to opposite electrode under DC voltage and the more serious deterioration of the oil-paper insulation dielectrics, the deeper positive space charges moved. At breakdown moment, space charge and electric field polarity are reversed, and space charge density and electric field decrease with the delay time after breakdown.
AB - During the long-term operation of electrical equipment of HVDC system, accumulated space charge in oilpaper insulation can greatly distort the local electric field, which can cause the aging and breakdown of the equipment. Therefore, it is important to understand the influence of the space charge on breakdown characteristics of oil-paper insulation dielectrics under DC voltage. In this paper, four kinds of oil-paper samples with different aging status are obtained by accelerating thermal aging. At room temperature, each sample is applied with DC voltage till breakdown. During the processes of the breakdown, the space charge distribution is measured using pulsed electro-acoustic (PEA) method, and space charge distribution is analyzed at the breakdown moment. The experimental results show that positive space charge moved towards to opposite electrode under DC voltage and the more serious deterioration of the oil-paper insulation dielectrics, the deeper positive space charges moved. At breakdown moment, space charge and electric field polarity are reversed, and space charge density and electric field decrease with the delay time after breakdown.
KW - Aging Status
KW - Breakdown Characteristics
KW - Oil-paper Insulation
KW - PEA method
KW - Space Charge
UR - https://www.scopus.com/pages/publications/84901742756
U2 - 10.1109/CEIDP.2013.6748217
DO - 10.1109/CEIDP.2013.6748217
M3 - 会议稿件
AN - SCOPUS:84901742756
SN - 9781479925964
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 992
EP - 995
BT - 2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013
T2 - 2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013
Y2 - 20 October 2013 through 23 October 2013
ER -