CAJ | 학술논문

1000kV特高压紧凑型线路潜供电流和恢复电压较特高压示范工程大，会降低单相重合闸的成功率，影响特高压系统的安全稳定性。为此，阐述了特高压紧凑型线路潜供电流和恢复电压的特点，基于两个500kV区域电网之间采用特高压紧凑型线路作为联络线的系统，用EMTP程序计算分析了紧凑型线路潜供电流和恢复电压的影响因素。研究结果表明：采用并联高抗的中性点小电抗是限制潜供电流和恢复电压的有效措施，小电抗应兼顾绝缘水平和抑制潜供电流和恢复电压优化选择。要满足采用0．7S单相重合闸的要求，紧凑线线路长度从100km至500km，高抗补偿度应从70％提高到95％。线路换位对潜供电流熄灭的影响相比环境等随机因素的影响和换位塔的造价，可以不予考虑，建议紧凑型线路不换位。
1000kV특고압긴주형선로잠공전류화회복전압교특고압시범공정대，회강저단상중합갑적성공솔，영향특고압계통적안전은정성。위차，천술료특고압긴주형선로잠공전류화회복전압적특점，기우량개500kV구역전망지간채용특고압긴주형선로작위련락선적계통，용EMTP정서계산분석료긴주형선로잠공전류화회복전압적영향인소。연구결과표명：채용병련고항적중성점소전항시한제잠공전류화회복전압적유효조시，소전항응겸고절연수평화억제잠공전류화회복전압우화선택。요만족채용0．7S단상중합갑적요구，긴주선선로장도종100km지500km，고항보상도응종70％제고도95％。선로환위대잠공전류식멸적영향상비배경등수궤인소적영향화환위탑적조개，가이불여고필，건의긴주형선로불환위。
The characteristics of 1000 kV AC compact transmission line are discussed, and the calculating results of secondary arc current and recovery voltage of 1000 kV AC compact transmission line using EMTP under different conditions such as the different length of the transmission line, the compensation factor, transposition, are preSen- ted. Simulation results show that the neutral reactor for HV shunt reactors can effectively limit the second arc cur- rent and recovery voltage, and the principle of selection of neutral reactor must take both insulation level and re- straint of second arc current together with recovery voltage into consideration. It is required that the time of reclos- ing should be 0. 7 s, the length of compact transmission line be 100 km to 500 kin, and the degree of compensation be 95 %, instead of 70 %. However, the influence of transposition, compared with random factors such as environ- ment, or the cost of construction of transposition tower, is negligible. The transposition is not recommended for compact transmission line.