CAJ | 학술논문

对于重覆冰架空线路，地线直流融冰采用了全线绝缘化设计，而地线绝缘化设计将影响短路电流在杆塔和地线中的分配。地线短路电流的准确计算对分析跨步电压和地网安全有重要意义。以实际全线绝缘地线为研究对象，详述融冰绝缘地线架设方式，利用 ATP-EMTP 仿真软件建立全线绝缘地线输电线路模型。研究了超高压融冰地线接线系统在不同单相短路状况下的短路电流分布特征，并与未绝缘化地线相比较。研究结果表明：单相短路地线感应电压将引起融冰绝缘地线间隙击穿，融冰绝缘地线架设改变了短路电流通道回路；绝缘架设后流回变电站地网短路电流变化不大，不会对地网安全造成影响；在短路点杆塔入地电流值升高最大，需特别考虑其跨步电压问题。
대우중복빙가공선로，지선직류융빙채용료전선절연화설계，이지선절연화설계장영향단로전류재간탑화지선중적분배。지선단로전류적준학계산대분석과보전압화지망안전유중요의의。이실제전선절연지선위연구대상，상술융빙절연지선가설방식，이용 ATP-EMTP 방진연건건립전선절연지선수전선로모형。연구료초고압융빙지선접선계통재불동단상단로상황하적단로전류분포특정，병여미절연화지선상비교。연구결과표명：단상단로지선감응전압장인기융빙절연지선간극격천，융빙절연지선가설개변료단로전류통도회로；절연가설후류회변전참지망단로전류변화불대，불회대지망안전조성영향；재단로점간탑입지전류치승고최대，수특별고필기과보전압문제。
For heavily ice-coated overhead transmission lines the full-length isolation design is applied to the ground wire for DC ice-melting, however the isolation design of the ice-melting ground wire impacts the distribution of short-circuit current between the tower and the ice-melting ground wire. Accurate computation of short-circuit current in the ice-melting ground wire is of significance to the analysis on both step voltage and safety of the grounding mesh. Taking actual full-length insulated ice-melting ground wire as research object, the erection mode of insulated ice-melting ground wire is expounded and using ATP-EMTP simulation software a transmission line model with full-length insulated ground wire is established. The distribution characteristics of short-circuit current in ice-melting insulated ground wire system for EHVAC transmission system under different single-phase short-circuit states are researched and the obtained results are compared with those of uninsulated ground wire system for EHVAC transmission lines. Research results show that the induced voltage due to single-phase short-circuit leads to the breakdown of clearance of ice-melting insulated ground wire and the erection of ice-melting insulated ground wire changes the channel of short-circuit current; after the erection of ice-melting insulated ground wire the short-circuit current flowing back to the grounding mesh changes slightly and does not impact on the safety of grounding mesh; the maximum rising of the current flowing into the ground via tower grounding appears at the position where the short-circuit occurs, therefore special consideration should paid to the step voltage at this position.