输电线路架空地线接地方式对线路零序参数的影响

发布时间：2018-10-12 13:45

【摘要】：输电线路零序阻抗的突降会直接影响线路接地距离保护和零序方向保护的工作可靠性。计算了输电线路架空地线在逐基杆塔接地(简称逐基接地)、单点接地、2处接地、3处接地等多种不同接地方式下的零序参数,讨论大地电特性(土壤电阻率)和架空地线电特性(架空地线型号)对输电线路零序参数的影响。结合地线绝缘子工频放电特性,计算了输电线路单相接地故障时沿线地线绝缘子工频放电动作情况。根据线路地线绝缘子动作情况,计算单相接地故障对输电线路零序参数的影响。研究表明,架空地线不同接地方式下线路零序参数存在差异,采取非逐基接地方式时,线路两侧变电站、沿线不同地点发生单相接地故障及不同短路电流下沿线地线绝缘子动作情况不同,线路零序参数可能不同。同时给出了架空地线单点接地和逐基接地时线路零序参数的现场测量方法。
[Abstract]:The sudden drop of zero sequence impedance of transmission line will directly affect the reliability of line grounding distance protection and zero sequence direction protection. In this paper, the zero sequence parameters of overhead ground wire of transmission line under different grounding modes, such as ground by base tower grounding, single point grounding, 2 grounding, 3 grounding, etc., are calculated. The effects of geoelectric characteristics (soil resistivity) and overhead geoelectric characteristics (overhead earth wire type) on the zero sequence parameters of transmission lines are discussed. Combined with the power frequency discharge characteristics of ground line insulator, the power frequency discharge action of ground line insulator along the transmission line under single-phase grounding fault is calculated. According to the ground line insulator action, the influence of single-phase grounding fault on the zero sequence parameters of transmission line is calculated. The study shows that there are differences in zero sequence parameters under different grounding modes of overhead ground wire. When the grounding mode is non-base-by-ground, the substation on both sides of the line, The zero sequence parameters may be different because of the different ground line insulator action under different short circuit current and single phase grounding fault in different places along the line. At the same time, the field measurement method of the zero sequence parameters of the line when the ground wire is grounded at single point and ground by ground is given.
【作者单位】：广东电力科学研究院;武汉大学电气工程学院;
【基金】：中国南方电网公司重点科技项目(K-GD2011-432)的资助
【分类号】：TM862.3

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