330kV GIS变电站电子式电压互感器抗VFTO干扰方法研究

Study on VFTO Suppressing Method for Electronic Voltage Transformer in 330 kV Gas Insulated Substation

气体绝缘开关装置(GIS)中的隔离开关在操作时产生的特快速暂态过电压(VFTO)会造成GIS电子式电压互感器二次设备损坏和信号骚扰,因此研究一种抑制VFTO的方法。首先分析GIS电子式电压互感器电压传递的数学模型,然后设计一套抑制VFTO的系统,最后通过330 kV GIS隔离刀闸开合试验验证抑制VFTO系统的有效性。试验证明,该方法可有效降低VFTO对GIS电子式电压互感器采集单元的影响,保证GIS电子式电压互感器稳定运行。

Very fast transient overvoltage(VFTO)generated during operation of disconnectors in gas-insulated switchgear(GIS)can cause secondary equipment damage and signal disturbance in GIS electronic voltage transformers.Therefore,a method of suppressing VFTO is studied in this paper.Firstly,the mathematical model of voltage transmission of GIS electronic voltage transformer is analyzed.Then,a system to suppress VFTO is designed.Finally,the effectiveness of the inhibition VFTO system is verified by the 330 kV GIS isolated knife gate opening and closing test.The experimental results show that this method can effectively reduce the influence of VFTO on the GIS electronic voltage transformer acquisition unit and ensure the stable operation of the GIS electronic voltage transformer.