超高压输电线路融冰绝缘地线单相短路电流分析

发布时间：2018-04-30 20:13

本文选题：交流超高压 + 直流融冰　；参考：《电网技术》2014年11期

【摘要】：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。
[Abstract]:For the overhead overlying lines, the whole line insulation design is adopted for DC melting ice of ground wire, and the design of ground wire insulation will affect the distribution of short-circuit current in tower and ground wire. The accurate calculation of ground wire short-circuit current is of great significance to the analysis of step voltage and the safety of ground grid. Taking the actual insulated ground wire as the research object, the method of setting up the ice-melting insulated ground wire is described in detail, and the transmission line model of the whole line insulation ground wire is established by using ATP-EMTP simulation software. The characteristics of the short-circuit current distribution of the EHV ice-melting ground wire connection system under different single-phase short-circuit conditions are studied and compared with the uninsulated ground wire. The results show that the inductive voltage of single-phase short-circuit ground wire will cause the gap breakdown of ice-melting insulated ground wire, and the installation of ice-melting insulated ground wire will change the short-circuit current channel circuit, and the short-circuit current of the ground network will not change much after the insulation is installed. It has no effect on the safety of ground network, and its stepping voltage should be taken into account when the tower enters the ground at the short circuit point.
【作者单位】：西南交通大学电气工程学院;云南电力试验研究院(集团)有限公司电力研究院;中国电力科学研究院;
【分类号】：TM75

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