标准雷电压下750kV复合横担暂态电场计算

发布时间：2018-05-30 23:10

本文选题：雷电冲击电压 + 暂态电场分布　；参考：《高电压技术》2017年02期

【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。
[Abstract]:The transient electric field distribution of power equipment under lightning impulse voltage is approximately replaced by solving the electrostatic field distribution under the lightning impulse peak voltage. Therefore, the transient electric field distribution of 750kV composite crossbar under lightning voltage is studied, and the method of calculating the transient electric field distribution in frequency domain is proposed, and the dielectric spectrum data of each material of composite crossbar are measured and quantitatively fitted. The calculation parameters of each material under the DC and harmonic components of lightning voltage in transient electric field calculation are obtained, and the transient electric field distribution of 750kV compound crossbar under standard lightning voltage is calculated and analyzed. The calculated results of the traditional method and the frequency-division method at the peak time of lightning voltage are compared and analyzed. The results show that the voltage of each component is similar, and the percentage of the difference of the maximum field strength on the surface of the hardware is between 0.58% and 2.92%. The maximum difference percentage of the field strength on the end surface of the insulator sheath is close to 18 and the percentage of the internal field strength difference of the pillar insulator is between 4% and 6%. This study can modify the calculation results of the traditional method and provide the basis for the insulation design of the composite cross-pole.
【作者单位】：合肥工业大学电气与自动化工程学院;安徽省飞机雷电防护重点实验室;西安交通大学电力设备电气绝缘国家重点实验室;
【分类号】：TM86

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