摘要
在超高压(EHV)输电线运行中采用单相重合闸以提高系统的可靠性和稳定性。为利于故障点灭弧,提高单相重合闸的成功率,一般采用并联电抗器加中性点电抗器的接线方式。计算和分析表明:中性点电抗器使断开相处于低电压状态,有利于灭弧,但不利于判断线路的绝缘水平,造成重合于故障线路。在中性点电抗器与地之间装设接地开关,在重合闸之前合上此开关,根据断开相电压值可有效判别线路故障的性质和绝缘水平,可防止重合于故障线路,提高重合闸的成功率。
The single phase autoreclosure is often used to improve the reliability and stability of power grid in EHV transmission lines. The connection of shunt reactor and neutral reactor is normally used to extinguish arc and to ensure success of autoreclosure. Calculation and analysis results show that the neutral reactor can maintain a low voltage at the fault location that makes arc easily extinguishing, but make it difficult to assess the level of insulation that makes reclosing within the fault line. To avoid failure of reclosure, a breaker between the neutral point and grounding point can be used. The breaker can be closed before reclosure, then the voltage of the fault line can be used to assess the insulation level of this line.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第24期49-52,共4页
Automation of Electric Power Systems
