Moisture and space charge in oil-impregnated pressboard under HVDC

ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132) Pub Date : 1998-06-22 DOI:10.1109/ICSD.1998.709217

R. Liu, A. Jaksts, C. Tornkvist, M. Bergkvist

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引用次数: 23

Abstract

Transformer oil and oil-impregnated pressboard are major insulating materials in a HVDC (high voltage direct current) converter transformer which provides electrical power transformation between an AC and a DC system. However, the dc component on the valve side of a HVDC converter transformer gives rise to special conditions, regarding space charge for example, for the insulating materials. In this paper, the relationship between moisture and space charge in oil-impregnated pressboard was investigated under dc electrical fields at room temperature. Formation, accumulation and distribution of space charge were studied using a PWP (pressure wave propagation) technique with the moisture concentration varying between 0.3% and 1.7% by weight. Experiments have shown that moisture influences seriously space charge distribution and thus electric field distribution in oil-impregnated pressboard. The higher the moisture concentration, the faster the establishment of space charge and the deeper the charge penetration into the insulation. The influence of moisture on the distribution of space charge should be taken into consideration in the design of an insulating system under HVDC.

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高压直流下油浸压板的水分和空间电荷

变压器油和油浸压板是高压直流换流变压器的主要绝缘材料，它在交流和直流系统之间提供电力转换。然而，高压直流换流变压器阀侧的直流元件会产生特殊的条件，例如绝缘材料的空间电荷。本文研究了室温直流电场作用下浸渍油压板中水分与空间电荷的关系。采用压力波传播(PWP)技术研究了水分浓度在0.3% - 1.7%(重量比)之间变化时空间电荷的形成、积累和分布。实验表明，水分对浸渍油压板的空间电荷分布有严重影响，从而影响电场分布。水分浓度越高，空间电荷的建立越快，电荷渗入绝缘层的程度越深。在高压直流环境下的绝缘系统设计中，应考虑湿度对空间电荷分布的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)

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