Proceedings ArticleDOI
Charge storage and transport in oil-impregnated pressboard at polarity reversal under HVDC
R. Liu,C. Tomkvist +1 more
- pp 33-36
TLDR
In this paper, the authors focus on the charge accumulation and movement in an transformer-oil-impregnated pressboard under DC polarity reversal at 60/spl deg/C. Using a pressure wave propagation (PWP) technique, the distribution of space charge in the sample was measured both at stationary and transient conditions.Abstract:
Space charge plays an important role in the breakdown and conduction processes of a high voltage direct current (HVDC) insulation system. Electrical breakdown due to charge accumulation in transformer oil and pressboard can cause failures of power transformers, especially at DC polarity reversal. In this paper, we focus our attention on the charge accumulation and movement in an transformer-oil-impregnated pressboard under DC polarity reversal at 60/spl deg/C. Using a pressure wave propagation (PWP) technique, the distribution of space charge in the sample was measured both at stationary and transient conditions.read more
Citations
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Journal ArticleDOI
Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques
TL;DR: In this paper, the authors focus on the space charge behavior in oil-paper insulation systems used in power transformers and propose a method to obtain accurate space charge measurement results using the pulsed electrostatic technique (PEA).
Proceedings ArticleDOI
Moisture and space charge in oil-impregnated pressboard under HVDC
TL;DR: The relationship between moisture and space charge in oil-impregnated pressboard was investigated under dc electrical fields at room temperature and the influence of moisture on the distribution of space charge should be taken into consideration in the design of an insulating system under HVDC.
And space charge in oil-impregnated pressboard under hvdc
TL;DR: In this paper, the authors proposed a transformer oil a d oil-impregnated pressboard as the insulating material in a HVDC (high voltage direct cum nt) converter transformer which provides electrical power transformation between an AC and a DC system.
Journal ArticleDOI
Experimental and analytical study of the DC breakdown characteristics of polypropylene laminated paper with a butt gap condition considering the insulation design of superconducting cable
TL;DR: In this paper, the authors investigated the variation of DC electric field strength, the step voltage and polarity reversal breakdown tests are performed under DC stress and investigated the electric field distributions in a butt gap of the composite insulation system consisting of liquid nitrogen (LN2)/polypropylene-laminated-paper (PPLP).
Proceedings ArticleDOI
Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage
TL;DR: In this article, the space charge dynamics in an oil and oil impregnated pressboard combined insulation system are investigated by the means of pulsed electroacoustic (PEA) technique under voltage polarity reversal conditions.
References
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Journal ArticleDOI
Electrical field distribution in transformer oil
TL;DR: In this paper, the electric field distribution in transformer oil has been studied at service stress levels in both the transient and steady state, and the field distributions observed are well described by a one-dimensional quantitative model based on charge carrier generation through dissociation of a species of ion pairs.
Journal ArticleDOI
Evolution of Experimental Techniques for the Study of the Electrical Properties of Insulating Materials
TL;DR: A very elegant technique to generate this pressure wave involves the use of a short-duration laser pulse as discussed by the authors, which acts as a virtual probe sensitive to charge, field or potential.