冲击电流波头对杆塔冲击特性模型试验结果的影响研究  

Study on the Impact of the Impulse Current Front Time on Tower Impulse Characteristics Model Experiments

作　　者：阮浩浩 陈坚[1] 傅正财[1] 江安烽[1] 

机构地区：[1]电力传输与功率变换控制教育部重点实验室,上海交通大学电气工程系,上海200240

出　　处：《电气技术》2014年第3期1-1,2-5,27,共6页Electrical Engineering

摘　　要：通过电磁暂态计算程序(EMTP)对雷直击500kV同塔双回杆塔塔顶时的反击过程进行了仿真计算和分析,得到集中电感、单波阻抗和多波阻抗三种杆塔模型时的塔顶及各层横担电压和杆塔分流系数。对比1/40杆塔模型的冲击响应小模型试验结果,选择了多波阻抗模型。采用该模型计算了不同波头的冲击电流下1/40杆塔模型的冲击特性,结果表明,冲击电流波头对杆塔塔顶及各横担电压影响很大,严格按照模型比例选取冲击电流波头进行小模型冲击特性试验研究是合适的。Electro-magnetic transient program（EMTP） was used to simulate and analyze the back flashover process when the top of a 500kV double circuits tower was stricken by lightning, and the top voltage, cross arm voltage and current shunting coefficient were then acquired under the circumstances of adopting lumped inductance, single wave impedance and multi wave impedance respectively. Comparing the small model test results of 1/40 tower model impulse response, multi wave impedance model was selected to calculate the impulse characteristics of small model under impulse current of various front time. The result indicated that, the front time of the impulse current would exert dramatic influence upon the top and cross arm voltage of the tower, and it was appropriate to conduct research on small model impulse characteristics test when the front time of the impulse current was strictly determined according to the model scale.

关 键 词：杆塔模型 小模型试验 冲击特性 冲击电流波头 ATP-EMTP 

分 类 号：TM753[电气工程—电力系统及自动化]