TY - JOUR
T1 - Effect of oil aging states on the space charge behavior in oil-paper insulation under DC electric field
AU - Wang, Da
AU - Wang, Shiqiang
AU - Tian, Jie
AU - Mu, Haibao
AU - Zhang, Guanjun
PY - 2013/8/5
Y1 - 2013/8/5
N2 - In order to deeply understand the effect of oil aging state on space charge behavior in oil-paper insulation under DC electric field, transformer oil samples with different aging states were prepared by accelerated thermally aging, and their physical and chemical properties were analyzed. Then new Kraft papers were dried in vacuum and immersed in oil above with different thermally aging states, and three kinds of oil-paper samples were achieved. The pulsed electro-acoustic (PEA) method was used for space charge measurement under both DC voltage-on and voltage-off conditions at room temperature. The impact of oil aging state on the characteristics of space charge injection, accumulation and decay was discussed. Experimental results show that homocharges are injected into samples at the interface of electrode and dielectric when DC voltage is on. When the aging state is worse, more charges are induced at both cathode and anode, as well as more space charges accumulate in the bulk. Besides the more the oil aging state is, the larger the area of negative charges is. For voltage-off condition, aging oil is beneficial for space charge decay. Moreover, trapped positive space charges decay faster than trapped negative charges.
AB - In order to deeply understand the effect of oil aging state on space charge behavior in oil-paper insulation under DC electric field, transformer oil samples with different aging states were prepared by accelerated thermally aging, and their physical and chemical properties were analyzed. Then new Kraft papers were dried in vacuum and immersed in oil above with different thermally aging states, and three kinds of oil-paper samples were achieved. The pulsed electro-acoustic (PEA) method was used for space charge measurement under both DC voltage-on and voltage-off conditions at room temperature. The impact of oil aging state on the characteristics of space charge injection, accumulation and decay was discussed. Experimental results show that homocharges are injected into samples at the interface of electrode and dielectric when DC voltage is on. When the aging state is worse, more charges are induced at both cathode and anode, as well as more space charges accumulate in the bulk. Besides the more the oil aging state is, the larger the area of negative charges is. For voltage-off condition, aging oil is beneficial for space charge decay. Moreover, trapped positive space charges decay faster than trapped negative charges.
KW - Oil aging state
KW - Oil-paper insulation
KW - Pulsed electro-acoustic (PEA)
KW - Space charge
UR - https://www.scopus.com/pages/publications/84881628971
M3 - 文章
AN - SCOPUS:84881628971
SN - 0258-8013
VL - 33
SP - 175
EP - 182
JO - Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
JF - Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
IS - 22
ER -