同塔四回750 kV六层横担输电线路电晕损失研究

Corona Loss of 750 kV Four-circuit Lines with Six-layer Cross-arms on the Same Tower

开展同塔四回750 kV 6层横担输电线路电晕损失的研究有利于同塔四回线路的电晕损失评估以及工程应用。为此,利用有限元分析软件计算了750kV同塔四回6层横担输电线路各相导线的最大表面有效场强,得到导线表面最大有效场强在14.33～15.70 kV/cm之间。根据不同海拔点淋雨及风沙天气下6×JL1/G1A–500/45/s400导线的电晕笼电晕损失数据,通过指数与线性联合修正形式将其修正到线路的计算海拔上。由电晕损失等效方法计算得到了电晕笼到实际线路的修正系数。对实际输电线路晴天、雨、雪、雾、风沙天气条件下的电晕损失功率进行分析,利用全年各种天气年小时数来对全线进行电晕损失估算分析,计算得到750 kV同塔四回6层横担线路的平均电晕损失功率为79.97 kW/km,最大电晕损失功率为400.96 kW/km,全年电晕损失能量为14.01×10~6 kW·h。

Research on corona loss of 750 kV four-circuit lines with six-layer cross-arms on the same tower is beneficial to corona loss evaluation and engineering application.Consequently,we calculated the maximum conductor surface field intensity in 750 kV four-circuit lines on the same tower by means of finite element method(FEM),which was between14.33 kV/cm and 15.70 kV/cm.Then,we analyzed the corona loss of 6×JL1/G1 A-500/45/s400 wire under heavy rainy and wind-sand condition at different elevations,which was corrected to the calculated altitude through the exponential and linear joint correction form.And the equivalent method of effective corona loss was studied.Next,the correction factor of the movable corona cage and 750 kV four-circuit lines with six cross-arms on the same tower were computed.Finally,the power of corona loss on sunny,rainy,snowy,foggy and sandy days was discussed,and the corona loss estimation of the whole 750 kV four-circuit lines on the same tower was calculated.Considering the weather factors throughout the year,the average power of corona loss of the whole line is 79.97 kW/km,the maximum power of corona loss is400.96 kW/km,and the annual corona loss energy is 14.01×10~6 kW·h.