摘要
电力设备在雷电冲击电压下的暂态电场分布多采用求解雷电冲击峰值电压下的静电场分布来近似替代。因此,研究了750kV复合横担在雷电压下的暂态电场分布,提出了暂态电场分布的分频域计算方法;试验测量并定量拟合了复合横担各材料的介电谱数据,得到了暂态电场计算中各材料在雷电压各直流分量及各谐波分量下的计算参数;计算分析了750kV复合横担在标准雷电压下的暂态电场分布,对比分析了传统方法与分频域方法在雷电压峰值时刻的计算结果。研究发现:两种方法所得复合横担各组件承受电压相近,各金具表面最高场强的差值百分比在0.58%~2.92%之间,绝缘子护套端部表面场强最大差值百分比接近18%,支柱绝缘子内部场强差值百分比在–4%~6%之间。该研究可修正传统方法的计算结果,并为复合横担的绝缘设计提供计算依据。
The transient electric field of electrical equipment under lightning impulse voltage （LIV） has usually been substituted by the electrostatic field under the peak value of LIV. Therefor, we studied the transient electric field of 750 kV composite cross-arms under LIV, and proposed the frequency division computation method of the transient electric field. The dielectric spectroscopy data of the materials used in 750 kV composite cross-arms were measured and quantitatively fitted. Then the computation parameters of the DC and each harmonic component for transient electric field computation were obtained. Moreover, we studied the transient electric field distribution of 750 kV composite cross-arms, and compared the computation results on the peak value of LIV that from the frequency division computation method with traditional method. The results showed that the potential distribution of composite cross-arm from the two methods were similar. The percentage of the difference for the surface electric field of fittings was from 0.58% to 2.92%. The maximum percentage of the difference for the surface electric field of insulator jacket was close to 18%. The percentage of the difference for the internal electric field of post insulators were from -4% to 6%. The research can correct the computation results from traditional method and provide computation basis for the insulation design of composite tower.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第2期645-653,共9页
High Voltage Engineering
关键词
雷电冲击电压
暂态电场分布
分频域计算方法
介电特性
750kV
复合横担
lightning impulse voltage
transient electric field distribution
frequency division computation method
dielectric properties
750 kV
composite cross-arms
