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Electric Field Analysis of 35kV Measuring Voltage Transformer with Insulation Defects

机译：35kV测量电压互感器具有绝缘缺陷的电场分析

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摘要

Metering voltage transformers of 35kV and below commonly adopt solid insulation structure. During the pouring process of insulation structure, defects such as bubbles and metal particles may be introduced to the solid insulation, which will cause partial discharges, and then affect the insulation and metering performance of the transformer. This paper mainly aims at the influence of the above defects on the insulation electric field of the transformer. A three-dimensional simulation model of a 35kV voltage transformer is established, and the influence of the defect type, defect location, defect size, and voltage waveform on the electric field distribution near the insulation defect are analyzed. The results show that: the electric field distortion caused by metal particles is slightly larger than that of bubbles; the insulation defect near the high voltage side of high voltage winding causes the most serious electric field distortion; smaller bubble defect causes stronger electricfield distortion, while larger metal particles cause stronger electricfield distortion. The electric field distortion laws of defects under power frequency voltage and impulse overvoltage are similar. The research of this paper can provide guidance to the production and maintenance of metering voltage transformers.
机译：35kV的计量电压变压器及以下通常采用固体绝缘结构。在绝缘结构的浇注过程中，可以将诸如气泡和金属颗粒的缺陷引入固体绝缘，这将导致部分放电，然后影响变压器的绝缘和计量性能。本文主要旨在涉及上述缺陷对变压器绝缘电场的影响。建立了35kV电压变压器的三维仿真模型，分析了缺陷型，缺陷位置，缺陷尺寸和电压波形对绝缘缺陷附近的电场分布的影响。结果表明：由金属颗粒引起的电场畸变略大于气泡;高压绕组高压侧附近的绝缘缺陷导致最严重的电场失真;较小的气泡缺陷导致电气场失真更强，而较大的金属颗粒会导致电气场变形更强。电力电压和脉冲过电压下的缺陷的电场失真定律是相似的。本文的研究可以为计量电压变压器的生产和维护提供指导。

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