耐热导线运行温度对带电作业 安全距离的影响研究

为了研究耐热导线运行温度对输电线路带电作业安全距离的影响，采用试验研究方法，得到了耐热导线在180 ℃高温运行时，导线本体及其周围温度的分布情况，以及耐热导线在160 ℃和240 ℃高温运行时，模拟导线－杆塔之间1.0~1.5 m空气间隙的操作冲击放电特性。通过理论计算分析耐热导线温度对模拟导线－杆塔空气间隙操作冲击放电的影响，所得结论与试验结果一致性较好。研究结果表明，耐热导线在240 ℃的运行温度下，对其周围空气温度的影响范围不超过10 cm，对1.0~1.5 m的空气间隙操作冲击放电电压产生的影响在2%左右。实际开展输电线路带电作业时，可忽略耐热导线运行温度对带电作业安全距离的影响。

Influence of Heat-Resistant Conductor Operating Temperature on Safety Distance of Live Working

In order to study the impact of heat-resistant conductor operating temperature on the safety distance of live working on power transmission line, the temperature distribution of the heat-resistant conductor was obtained at 180 ℃of the temperature of conductor，and the switching impulse discharge characteristics of 1.0~1.5 m air gap between simulated conductor and tower were gained when the temperature of conductor was between 160 ℃ and 240 ℃. And the influence of heat-resistant conductor operating temperature on the discharge characteristics of the simulated air gap between conductor and tower was analyzed by theoretical calculation, whose results had good consistency with the experimental results. The results show that, when the operating temperature of heat-resistant conductor is 240 ℃, the influence range of high temperature conductor on ambient air temperature is no more than 10 cm range, and the influence on the switching impulse discharge voltage of 1.0~1.5 m air gap is about 2 %. Therefore, the influence of heat-resistant conductor operating temperature on the safety distance can be ignored in the live working of power transmission line.