考虑频变参数的交联聚乙烯电缆中局部放电传播特性的时域分析

发布时间：2018-06-25 02:49

本文选题：时域分析 + 半导体层　；参考：《高电压技术》2014年11期

【摘要】：为研究电力电缆中局部放电脉冲的传播特性,并综合考虑导体集肤效应和半导体层等因素的影响,总结了单芯交联聚乙烯(XLPE)绝缘电力电缆的频变模型。为进一步将该模型应用于时域分析中,使用矢量拟合方法对解析模型进行有理化近似。在拟合结果的基础上,提出了等效的Г型集总参数电路模型。基于该电路模型对具有不同复介电常数半导体层的中压XLPE电缆进行仿真,并与采用ATP中改进的J-Marti模型计算结果进行了比较,同时还对Gauss型和不对称型两类放电脉冲的传播特性进行了研究。计算结果表明:电缆中的高频局部放电脉冲幅值具有较强的衰减;在色散因素的影响下,Gauss型脉冲会产生不对称现象;所述模型能够对电缆中的局部放电传播特性进行分析,为电力电缆的局部放电检测带宽和故障诊断提供参考。
[Abstract]:In order to study the propagation characteristics of the partial discharge pulse in the power cable, and take into consideration the influence of the skin effect and the semiconductor layer, the frequency variation model of the single core cross-linked polyethylene (XLPE) insulated power cable is summarized. On the basis of the fitting results, an equivalent lumped lumped parameter circuit model is proposed. Based on the model, a medium voltage XLPE cable with different complex dielectric constant is simulated, and the results are compared with the results of the improved J-Marti model in the ATP. At the same time, the two types of discharge pulses of the Gauss and the asymmetric type are also given. The calculation results show that the amplitude of the high frequency partial discharge pulse in the cable has a strong attenuation, and the Gauss type pulse will be asymmetrical under the influence of the dispersion factor. The model can analyze the local discharge propagation characteristics in the cable and detect the bandwidth and reason of the partial discharge of the power cable. Barrier diagnosis provides reference.
【作者单位】：西安交通大学电气工程学院;深圳供电局有限公司;
【分类号】：TM855

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