基于电弧模型的±800 kV直流输电线路带电作业电位转移电流分析

Potential Transfer Current Analysis of Live Working in the±800 kV DC Transmission Line Based on Arc Model

等电位带电作业是确保输电线路安全稳定运行的重要技术手段,但电位转移过程中会出现高幅值高频率脉冲放电电流,给作业人员的安全造成了严重威胁。为此,提出了基于控制论电弧模型的输电线路等电位带电作业电位转移电流计算方法,分析了经验系数和电弧电压梯度等参数对电位转移电流的影响;以吊篮法和软梯法两种进入等电位作业方式为研究对象,得到了电位转移电流峰值和转移电荷量等随转移距离的变化规律。结果表明:转移电流波形均呈衰减振荡,转移电流峰值及转移电荷量与转移距离成正比;相同转移距离条件下,采用吊篮法获得的转移电流峰值更小。

Equipotential live working is an important technical mean to ensure the safe and stable operation of transmission lines,but high amplitude and high frequency pulse discharge current appears in the process of potential transfer,which brings a serious threat to the safety of operators.To this end’a calculation method of potential transfer current in transmission line equipotential live working based on cybernetics arc model was proposed,and the influence of the empirical coefficient and arc voltage gradient on the potential transfer current was analyzed.Taking the hanging basket method and soft ladder method as the research objects,the variation of the peak potential transfer current and the transfer charge with the transfer distance was obtained.The results show that the waveforms of the transfer current are damped oscillation,and the transfer current peak and transfer charge are proportional to the transfer distance.Under the same transfer distance,the transfer current peak obtained by the hanging basket method is smaller.