华电技术 ›› 2017, Vol. 39 ›› Issue (7): 20-23.

• 研究与开发 • 上一篇    下一篇

基于EMTP的交叉互联型电缆雷电过电压影响因素分析

  

  1. 1.国家电网公司直流建设分公司,北京〓100032; 2.国网电力科学研究院武汉南瑞有限责任公司,武汉〓430074; 3.宁夏送变电工程公司,银川〓750000
  • 出版日期:2017-07-25 发布日期:2017-08-08

EMTPbased interconnection cable lightning overvoltage affecting factors analysis

  1. 1.State Grid Corporation of China Direct Current Construction Company,Beijing 100032,China;2.State Grid Electric Power Research Institute Wuhan NARI Company Limited,Wuhan 430074,China;3.Ningxia Power Transmission and Distribution Construction Company,Yinchuan 750000,China
  • Online:2017-07-25 Published:2017-08-08

摘要:

通过建立交叉互联型电缆电磁暂态程序(EMTP)仿真模型,研究雷电流波形、电缆布置方式、电缆长度、冲击接地电阻的大小、土壤电阻率以及电缆末端负荷的性质与电缆雷电过电压的关系。结果表明:波头越陡,导体上产生的过电压越大;电缆水平布置时产生的雷电过电压较小;电缆长度在3000m时雷电过电压达最大值,均等长度设置有利于降低雷电过电压;冲击接地电阻及土壤电阻率对雷电过电压影响较小;负荷数值越大电缆雷电过电压越大,负荷为容性或是感性时,电缆雷电过电压较电阻性负荷有所增大。

关键词:

Abstract:

Based on electromagnetic transient program(EMTP) simulation model, lightning current waveform,cable alignment,cable length,impulse grounding resistance,and the relationship of cable end load and cable lightning overvoltage was studied. The result indicated that steeper the wave front is,greater the overvoltage is. The lightning overvoltage is relatively small if cable is horizontally aligned. Lightning overvoltage is maximum if the cable length is 3000m. Cable aligned in same length will reduce lightning overvoltage. Impulse grounding resistant and soil resistant can barely affect the lightning overvoltage. Bigger the load is,greater the cable lightning overvoltage is. The cable lightning overvoltage is greater if load is capacitive or inductive.

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