500 kV并联电抗器单投切试验研究

Study and Test for on-off Operation of 500 kV Shunt Reactor Alone

为解决南方互联电网梧州５００ｋＶ开关站母线电压偏高问题，拟在梧州站母线投入１组１５０Ｍｖａｒ并联电抗器（以下简称高抗）。从理论分析、实验仿真及现场试验等方面对梧州站高抗投入的作用及投切时过电压状况进行了探索。现场试验表明，梧州站投入高抗使母线电压降低２％，是降低母线电压的一种有效方法；但在切除高抗时会产生较高过电压。理论分析表明，在不带避雷器情况下，切除高抗会产生近７倍的过电压；带上避雷器，所产生的过电压将近３倍。为避免较高的过电压对电气设备造成损坏，切除高抗的操作不宜在梧州站内进行。

To solve the problem with high deviation on bus voltage at Wu Zhou 500 kV Switchyard in South China Allied power Grid, it was planned to install a set of 150 Mvar shunt reactor (chigh voltage reactor in brief bereaffenr). By thcoretical analysis, laboratory simulation and field test, the effect of the high voltage reactor and the overvoltage response under the on off operation were studied and observed. Field test showed that the commission of the high voltage reactor was effective to lower the bus voltage at Wu-Zhou Swikhyard, attainning to 2%; but, by the way, serious overvoltage would be produced when the reactor was cut off. Theoretical analysis showed that the overvoltage when the reactor was cut off would be nearly 3 times or 7 times. of the rafed value, if there were or not lightning avresters coupled. \ \ Inorder to avoid such serious overvoltage which will eause demage to electric equipments, it is recommended not to underfake the on off operation of the high voltage reactor at Wu-Zhou Switchyard.