CAJ | 학술논문

线路稳态下的潜供电弧参数(潜供电流和恢复电压)是其潜供电弧自灭的两个决定因素.推导了以分布参数法求解同塔双回线在发生单相接地故障时的潜供电弧参数的计算公式,考虑线路末端装设并联电抗器时对这些参数的影响.以500 kV同塔双回蝶沧线为例,计算其潜供电弧参数,以验证算法的正确性.分析显示,潜供电流与恢复电压不仅与线路参数有关,而且还与线路的电流(或输送潮流)及故障点位置密切相关;当线路无并联电抗器时潜供电流会增大,线路熄弧时间将延长.
선로은태하적잠공전호삼수(잠공전류화회복전압)시기잠공전호자멸적량개결정인소.추도료이분포삼수법구해동탑쌍회선재발생단상접지고장시적잠공전호삼수적계산공식,고필선로말단장설병련전항기시대저사삼수적영향.이500 kV동탑쌍회접창선위례,계산기잠공전호삼수,이험증산법적정학성.분석현시,잠공전류여회복전압불부여선로삼수유관,이차환여선로적전류(혹수송조류)급고장점위치밀절상관;당선로무병련전항기시잠공전류회증대,선로식호시간장연장.
The secondary arc parameters of a transmission line in a steady state, i.e. its secondary arc current and recovery voltage, are the key factors of its secondary arc being extinguished itself. This paper deduces the calculation formulae of secondary arc parameters for a double-circuit line in a single phase grounding failure, and discusses the impact of the case there being shunt reactor installed at the end of the line on the parameters. The 500 kV Dieling–Cangjiang double-circuit line on the same tower is taken as an example for secondary arc parameters calculation as to verify the correctness of the proposed algorithm. It proves that the sedondary arc parameters are related not only with the line parameters, but also with the line current (or power load). The secondary arc current becomes larger if there is no shunt reactor, and thus the extinguishing time of the line arc becomes longer too.