35kV老旧导线电气性能研究

Study on the 35 kV Old Conductors Electrical Performance

导线的电气性能之一表现为导线的温升情况,从理论出发计算35 kV老旧导线与新线的载流温升,并通过试验测试导线的实际温升情况,探究老旧导线的电气性能。理论结果表明:分析得出新线的辐射散热功率比老旧导线少46%左右。当载流量低于150 A时,温升由高到低的顺序为:带有防振锤的老旧导线、老旧导线、新线;当载流量大于150 A时,温升由高到低的顺序为:老旧导线、带有防振锤的老旧导线、新线。试验结果表明:对于LGJ70/10导线而言,在相同的电流值下,新线的温升比老旧导线的温升低11%左右。以理论和试验相结合分析得出:老旧导线的辐射散热功率快于新线是温度低的主要影响因素。

The temperature rise of the conductor is one of the electrical properties of performance,Starting from the theoretical calculation of 35 kV old wires with a new line of current-carrying temperature rise,and through the actual situation of the test conductor temperature rise,explore old electrical properties of the wire. The theo-retical results show that the analysis of the new line of radiation power is about 46% smaller than the old wires. When carrying capacity is lower than 150 A,temperature rise by to small order greatly for：old wires with vibration hammer,old wires,new line;When carrying capacity is more than 150 A,temperature rise by to small order greatly for：old wires, old wires with vibration hammer, new line. Experimental results show that for LGJ70/10 wires, under the current value of the same, not to serve the temperature rise of a new temperature rise about 11% less than that of the old cable. To the combination of theoretical and experimental analysis：the radiation heat power of the old wire faster than new line is the main influence factors of low temperature.