TY - GEN
T1 - Space charge modulated electrical breakdown of oil impregnated paper under AC-DC combined voltages in frequencies of 50∼600 Hz
AU - Zhu, Yuanwei
AU - Min, Daomin
AU - Li, Shengtao
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/12/15
Y1 - 2016/12/15
N2 - High-frequency harmonics occur in converter transformers, which may lead to unexpected breakdown of oil impregnated paper insulation under ac-dc combined voltages with high frequencies. Here in this paper, the breakdown characteristics of oil impregnated paper insulation under ac-dc combined voltages in frequencies of 50∼600 Hz were experimentally investigated. After considering the characteristics of charge injection, hopping and diffusion, the space charge behaviors in the ac-dc breakdown process were investigated based on a modified bipolar charge transport model. The results show that the breakdown voltage decreases with increasing ac offset ratio (Vac/(Vac+Vdc)), and the breakdown voltage decreases with an increase in applied frequency regardless of the ac offset ratio. It is observed that homo-charges are accumulated during ac-dc breakdown, and the charge density in the vicinity of the electrodes increases with elevating applied frequency, leading to an enhancement of the built-in electric field distortion and thereby resulting in a decrease of the breakdown voltage.
AB - High-frequency harmonics occur in converter transformers, which may lead to unexpected breakdown of oil impregnated paper insulation under ac-dc combined voltages with high frequencies. Here in this paper, the breakdown characteristics of oil impregnated paper insulation under ac-dc combined voltages in frequencies of 50∼600 Hz were experimentally investigated. After considering the characteristics of charge injection, hopping and diffusion, the space charge behaviors in the ac-dc breakdown process were investigated based on a modified bipolar charge transport model. The results show that the breakdown voltage decreases with increasing ac offset ratio (Vac/(Vac+Vdc)), and the breakdown voltage decreases with an increase in applied frequency regardless of the ac offset ratio. It is observed that homo-charges are accumulated during ac-dc breakdown, and the charge density in the vicinity of the electrodes increases with elevating applied frequency, leading to an enhancement of the built-in electric field distortion and thereby resulting in a decrease of the breakdown voltage.
UR - https://www.scopus.com/pages/publications/85009812039
U2 - 10.1109/CEIDP.2016.7785609
DO - 10.1109/CEIDP.2016.7785609
M3 - 会议稿件
AN - SCOPUS:85009812039
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 441
EP - 444
BT - 2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2016
Y2 - 16 October 2016 through 19 October 2016
ER -