CAJ | 학술논문

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。
수전선로령서조항적돌강회직접영향선로접지거리보호화령서방향보호적공작가고성。계산료수전선로가공지선재축기간탑접지(간칭축기접지)、단점접지、2처접지、3처접지등다충불동접지방식하적령서삼수，토론대지전특성(토양전조솔)화가공지선전특성(가공지선형호)대수전선로령서삼수적영향。결합지선절연자공빈방전특성，계산료수전선로단상접지고장시연선지선절연자공빈방전동작정황。근거선로지선절연자동작정황，계산단상접지고장대수전선로령서삼수적영향。연구표명，가공지선불동접지방식하선로령서삼수존재차이，채취비축기접지방식시，선로량측변전참、연선불동지점발생단상접지고장급불동단로전류하연선지선절연자동작정황불동，선로령서삼수가능불동。동시급출료가공지선단점접지화축기접지시선로령서삼수적현장측량방법。
Sudden decrease of zero-sequence impedance of transmission line directly affects operational reliability of ground distance protection and zero-sequence directional protection of transmission line. The values of zero-sequence parameters of overhead ground wire under various grounding modes, such as tower-after-tower grounding, single-point grounding, two-point grounding, three-point grounding and so on, are calculated, and the impacts of soil resistivity and the types of overhead grounding wires on zero-sequence parameters of transmission line are researched. Combining with power frequency discharge characteristics of ground wire insulators, the circumstance of power frequency discharge of overhead wire insulators along the transmission line under single-phase earth fault of transmission line is calculated. According to the discharging situation of ground wire insulators the impact of single-phase earth fault on zero-sequence parameters of transmission line is calculated. Results of this research show that there are differences among the values of zero-sequence parameters of transmission line under different grounding modes of overhead ground wire, and under various overhead ground wire grounding modes apart from the each tower grounding mode the action situations of overhead ground wire insulators along the transmission line are different under the condition that single-phase earth fault occurrs in substations located at both terninals of the transmission line or at different positions along the transmission line or under different short-circuit currents, so that the values of zero-sequence parameters of transmission line may be different. In addition, on-site methods to measure the values of zero-sequence parameters of transmission line are given under tower-after-tower grounding and single-point grounding of overhead ground wire.