超/特高压输电线路带电直流融冰方法

摘要

Inorder to solve the problem oftraditional deicing technologies requiring power failurewhen transmission lines are extremely accumulated by ice, an energizeddirect current (DC)ice-melting solution was proposed for high voltage(EHV)or ultra high voltage(UHV)transmission lines which used bundled conductors, and a field test was conducted. Taking a UHV transmission line with two-bundle conductors and insulating spacer as an example, the simulation model of ice-melting circuit was established by ATP software, and the problems of ice-melting power, installation position, power selection andthe effects of DC current in the ice-melting period ontheexternal circuit were analyzed. The results show that the three-phase halfcontrolled bridge rectifier (full control) and DC generators are effective ways to obtain ice-melting power.The most idealposition of installing power supply device is the middle of ice-melting section. DC ice-melting current of melting-circuitswillnot flow outside,whichhas no effect on the amplitude and waveform of exterior line voltage and current. The methodensures the normal and stable operation in the ice-melting process with load, and overcomes the limitations existinginice-melting methodswhich can not energized ice melting.%为了解决架空线路传统融冰方法需停电作业的问题，对采用分裂导线的超/特高压输电线路提出一种带电直流融冰方法，并进行现场试验验证。以二分裂导线和绝缘间隔棒架设的超高压输电线路为研究对象，利用ATP软件建立融冰电路的仿真模型，分析融冰电源的获取途径、安装位置和功率选取问题，以及融冰段内的直流电流对外部电路的影响。研究结果表明：三相桥式半控(全控)整流和直流发电机是获取融冰电源的有效途径；直流融冰电源装置安装在融冰区段中间位置最理想；融冰段内的直流电流不会流出融冰回路，对融冰区段外部线路电压和电流幅值及波形不产生任何影响，确保融冰线路在带负荷融冰过程中的正常、稳定运行，克服现有融冰方法中不能带电融冰的局限性。