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GIS用电子式电压互感器的VFTO抑制方法研究
引用本文:王峰,康兵,舒乃秋,常怡东,袁开明.GIS用电子式电压互感器的VFTO抑制方法研究[J].电测与仪表,2017,54(4).
作者姓名:王峰  康兵  舒乃秋  常怡东  袁开明
作者单位:1. 武汉大学 电气工程学院,武汉,430072;2. 国电南京自动化有限公司,南京,210032
基金项目:基金资助项目:中央高校基本科研业务费专项资金(2012207020208)
摘    要:针对GIS中隔离开关操作产生的特快速暂态过电压(VFTO)导致有源电子式互感器采集卡损坏的问题,提出了一种新的VFTO抑制措施。首先研究电子式互感器中电容分压器的幅频特性,并推导出有源电子式互感器在高频条件下的分压比,通过计算得到作用于电子式互感器二次侧采集卡上的过电压幅值。进一步提出了在电子式互感器的电容分压器上插入同轴金属圆柱筒的方法,提高了电容分压器高频分压比,降低了VFTO的二次侧输出电压值。仿真结果表明,该方法大幅降低了VFTO作用于采集卡上的过电压,从而对采集卡形成保护,提高了电子式互感器运行的稳定性。

关 键 词:电子式互感器  快速暂态过电压  电容分压器  高频分压比
收稿时间:2015/10/21 0:00:00
修稿时间:2016/3/24 0:00:00

Study on VFTO suppressing method for electronic voltage Transformer in gas insulated substation
wangfeng,kangbing,shunaiqiu,changyidong and yuankaiming.Study on VFTO suppressing method for electronic voltage Transformer in gas insulated substation[J].Electrical Measurement & Instrumentation,2017,54(4).
Authors:wangfeng  kangbing  shunaiqiu  changyidong and yuankaiming
Affiliation:School of Electrical Engineering Wuhan University,School of Electrical Engineering Wuhan University,School of Electrical Engineering Wuhan University,School of Electrical Engineering Wuhan University,School of Electrical Engineering Wuhan University
Abstract:Affected by the very fast transient overvoltage (VFTO),the acquisition card of active electronic voltage transformer in the gas insulated substation (GIS) might be damaged while the circuit breaker is being operated.In order to solve this problem,a new impedance suppressing method for the electronic voltage transformer has been proposed in this paper.Through amplitude-frequency characteristic analysis,we deduced the amplitude of very fast transient overvoltage for the electronic acquisition card,and the multilayer coaxial capacitors in parallel structure is proposed to increase the capacitance of low voltage arm capacitor,which also increases high frequency voltage division ratio and effectively suppresses the VFTO secondary overvoltage.Finally,the simulation results show that the method can significantly reduce the VFTO secondary voltage output,thus it protects the collector from high voltage and improves operating stability of electronic transformer.
Keywords:electronic transformer  VFTO  capacitive voltage divider  high-frequency voltage division ratio
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