Space Charge Behaviors of Thermally Aged Kraft Paper impregnated with Synthetic Ester Liquid
Space Charge Behaviors of Thermally Aged Kraft Paper impregnated with Synthetic Ester Liquid
复制标题
合成酯液体浸渍热老化牛皮纸的空间电荷行为
DOI：
10.23919/cmd54214.2022.9991286
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zhongdong Wang
中科院分区：
文献类型：
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作者：
Abdelrahman M. Alshehawy;S. Matharage;Zhongdong Wang
由于直流偏压，某些高压直流换流变压器的绝缘系统中会形成空间电荷，导致电场畸变，最终导致绝缘失效。研究空间电荷行为对于设计和操作高压直流变压器非常重要。本文研究了纸张老化对合成酯和牛皮纸绝缘系统空间电荷行为的影响，作为高压直流变压器的潜在候选材料。电极处的最大电荷密度和样品中的总累积电荷在老化早期有所增加，但随后下降到几乎与新纸样品相同的水平。在电压关闭期间观察到快速电荷耗散，表明老化的纸样品中可能产生浅陷阱。
Due to DC bias, space charges are formed in the insulation system of certain HVDC converter transformers, which can cause electric field distortion and eventually insulation failure. Studying the space charge behaviour is important in designing and operating HVDC transformers. This paper investigates the impact of paper-ageing on the space charge behaviour of insulation systems with synthetic ester and Kraft paper insulation as a potential candidate for HVDC transformers. The maximum charge density at the electrodes and the total accumulated charges in the sample increased at the early stage of ageing but later decreased almost to the same level as the new paper samples. A fast charge dissipation was observed during the volt-off period, indicating a possible shallow trap generation in aged paper samples.