Space charge in polymeric insulation under ac electric fields &amp;#x2014; A schematic model

Chen, G.; Li, S. T.; Zhong, Lisheng

doi:10.1109/ceidp.2013.6748118

Cited by 7 publications

(1 citation statement)

References 12 publications

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“…However, the space charge behaviour under AC stresses, especially with the power frequency, has been rarely investigated, due to the much smaller quantity of AC charge amount compared with DC one; and the requirement of the much faster data acquisition system in order to measure the phase related charge dynamics [4]. Some efforts has been made on the AC space charge in polymeric materials [5][6][7][8][9], which reveal that AC space charge is closely related to the frequency and the asymmetric properties of positive and negative charge carriers. In addition, little AC space charge has been observed in the multilayer oil impregnated Kraft papers [10].…”

Section: Introductionmentioning

confidence: 99%

Space charge dynamics in oil-impregnated pressboard under AC electric field

Hao

Jiang

et al. 2015

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Abstract-Space charge has been a general concern related with the reliability and the life-time of HVDC components. In this present work, the space charge profiles in oil-impregnated pressboards are investigated by the means of the pulsed electroacoustic (PEA) technique under AC voltage with 50 Hz at the room temperature. It has been observed that the ageing status of the mineral oil and the presence of the oil gap can influence the charge accumulation significantly. In the fresh oil impregnated pressboard, considerable negative charges are accumulated near the aluminium electrode. However, only little or no space charge can be detected in the aged oil impregnated pressboard and the oil gap and pressboard composite insulation system. The results may suggest that the amount of the AC space charge is highly dependent on the charge mobility within the dielectrics. The higher charge mobility can result in a smaller amount of AC space charge.

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