交流高压下表面放电对乙丙橡胶电缆绝缘劣化特性的影响

IF 1.4 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Longlei Bai, Daoping Fan, Tianhe Li, Bing Li, Mingwei Su, Shaogui Fan, Liuzhong Zhang
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引用次数: 5

摘要

为研究高速列车交流电压作用下EPR电缆绝缘局部放电劣化特性,建立了EPR柱-板绝缘模型实验平台。对放电处理后的绝缘试样的表面状况和击穿电压进行了观察和测量。此外,还提出了一个评价EPR试样劣化程度的拟合公式。结果表明:在多次放电预处理下,体积电阻率先增大后减小;当局部放电强度增加到100 pC时,体积和表面电阻率单调下降,下降速率与局部放电强度呈正相关。在PD预处理过程中,电极附近出现一个白色圆圈,随着PD强度的增加而变为淡黄色。PD预处理为50和100 pC时,EPR绝缘耐压先升高后降低,且下降趋势缓慢。对于200和400 pC的PD预处理,耐压随降解时间的延长而显著降低。拟合公式模型表明,在强电场作用下,EPR绝缘试样的可靠性、分子链断裂的概率和速率与放电活动强度之间的关系不是线性的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influence of surface discharge on the deterioration characteristics of ethylene-propylene rubber cable insulation under alternating current high voltage

Influence of surface discharge on the deterioration characteristics of ethylene-propylene rubber cable insulation under alternating current high voltage

To investigate partial discharge-induced deterioration characteristics of ethylene-propylene rubber (EPR) cable insulation under repeated alternating current (AC) voltage on high-speed trains, an experimental platform with a column-plate EPR insulation model is established. The surface condition and breakdown voltage of insulation samples after discharge treatment are observed and measured. In addition, a fitting formula to evaluate the deterioration extent of EPR samples is proposed. The results show that under repeated discharge pretreatments, the volume resistivity increases first and decreases afterwards when discharge magnitude is low. When partial discharge (PD) intensity increases to 100 pC, the volume and surface resistivity decrease monotonously, and the decreasing rate is positively correlated with PD intensity. During PD pre-treatment, a white circle appears near the electrode and turns to pale yellow with PD intensity. For PD pretreatments of 50 and 100 pC, withstand voltage of EPR insulation increase first and decrease afterwards, and the downward trend is slow. For PD pre-treatments of 200 and 400 pC, the withstand voltage decreases significantly with the degradation time. The fitting formula model shows that under the action of a strong electric field, the relationship between the reliability of EPR insulation samples, the probability and rate of molecular chain breakage, and the intensity of discharge activity is not linear.

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来源期刊
Iet Science Measurement & Technology
Iet Science Measurement & Technology 工程技术-工程:电子与电气
CiteScore
4.30
自引率
7.10%
发文量
41
审稿时长
7.5 months
期刊介绍: IET Science, Measurement & Technology publishes papers in science, engineering and technology underpinning electronic and electrical engineering, nanotechnology and medical instrumentation.The emphasis of the journal is on theory, simulation methodologies and measurement techniques. The major themes of the journal are: - electromagnetism including electromagnetic theory, computational electromagnetics and EMC - properties and applications of dielectric, magnetic, magneto-optic, piezoelectric materials down to the nanometre scale - measurement and instrumentation including sensors, actuators, medical instrumentation, fundamentals of measurement including measurement standards, uncertainty, dissemination and calibration Applications are welcome for illustrative purposes but the novelty and originality should focus on the proposed new methods.
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