一起220kV主变压器间隙零序保护动作分析  

Analysis on zero sequence protection actionmain transformer gap with 220 kV

作　　者：汤海霞[1] 刘恒[2] 

机构地区：[1]国网随州供电公司,湖北随州441300 [2]国网孝感供电公司,湖北孝感432100

出　　处：《电源技术应用》2014年第11期62-64,共3页Power Supply Technologles and Applications

摘　　要：针对某水电厂220kV升压站近区发生一起220kV输电线路C相遭雷击导致线路瞬时单相接地故障，在线路非全相运行情况下，220kV3#主变间隙保护动作切机。通过对故障原因分析，认为220kV主变高压侧问隙零序保护动作正确，同时提出了220kV主变中性点保护的改进方案及注意事项。In order to reduce the switching frequency and loss of 3-phase PWM rectifier, a novel hysteresis current control method based on hysteresis current control and voltage space vector is proposed. This method gives the optimal space vector by detecting the current error space vector and the system reference voltage space vector, and then controls the current error below the hysteresis width. Voltage space vector is introduced into the control system to eliminate the phase interference, and it can be realized simply without complicated vector transform. The validity of this control method is confirmed by MAT-LAB/SIMULINK simulation and experiments.

关 键 词：主变压器 中性点 间隙零序保护 分析 

分 类 号：TM46[电气工程—电器]