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。
In order to research the propagation characteristics of partial discharge（PD） in power cables, combining the influences of conductor skin effects and semi-conducting layers（SCL）, we put forward a frequency-dependent model for single-core cross-linked polyethylene（XLPE） insulation cables. To analyze wave propagation in time domain, an analytical model is firstly rationally approximated by the vector fitting method. Based on the fitting results, the equivalent Г-section lumped parameters model is then proposed. In the application of the developed technique, a medium-voltage XLPE cable with different complex permittivity of SCL is considered in the simulation, where the calculated PD waveforms are compared with those of the modified J-Marti model in ATP. Furthermore, the propagation of both Gaussian and asymmetric PD pulses are studied. Calculation results show that there is a strong attenuation for high-frequency PD pulse amplitude in cable. Under the influence of the dispersive factors, the Gaussian pulse source will become asymmetric. The proposed model can be used to analyze the propagation characteristics of PD signals, which will be helpful for the PD detection bandwidth and defects identification in power cable.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第11期3461-3467,共7页
High Voltage Engineering
关键词
时域分析
半导体层
局部放电
传播特性
矢量拟合
交联聚乙烯电缆
time-domain analysis
semiconducting layer
partial discharge
propagation characteristics
vector fitting
cross-linked polyethylene cable
