VFTO对电子式互感器及采集装置的影响及控制措施

为了探索解决智能变电站GIS隔离开关操作对电子式互感器及采集装置的影响问题。本文首先通过分析GIS隔离开关操作过程中VFTO产生的机理及对电子式互感器的影响。然后采用EMTP仿真软件对隔离开关操作过程中VFTO的产生过程进行仿真，对软件仿真结果进行了详细分析，得出了隔离开关操作过程中VFTO的分布规律。针对仿真得出的分布规律，提出了通过在电源端口增加过电压抑制设计、信号端口采用三级防护电路、优化机箱结构与屏蔽设计、优化数据采集及控制算法等防范措施进行抑制的解决方案，仿真结果表明，该方案能有效抑制隔离开关操作过程中VFTO的产生，最大限度减小VFTO对电子式互感器及采集装置的影响，减轻现场运维工作量，提高智能变电站电子式互感器的运行可靠性。

The impact and control measures of VFTO on electronic transformers and acquisition devices

In order to explore and solve the problem of influence of GIS disconnector operation on electronic transformer and acquisition device in intelligent substation, Firstly, the paper analyzes the mechanism of VFTO in the operation of GIS disconnector and its influence on electronic transformer, Then, EMTP simulation software is used to simulate the generation process of VFTO during the operation of disconnector. The software simulation results are analyzed in detail, and the distribution rule of VFTO during the operation of disconnector is obtained.According to the distribution rule obtained by simulation, this paper puts forward the solution of suppression by adding overvoltage suppression design in power port, adopting three-level protection circuit in signal port, optimizing box structure and shield design, optimizing data acquisition and control algorithm, etc.. Simulation results shows that the scheme can effectively restrain the VFTO generation during the operation of disconnector, minimize the influence of VFTO on electronic transformer and acquisition device, reduce the workload of maintenance, and improve the reliability of electronic transformer in intelligent substation.