摘要
全封闭气体绝缘组合开关内隔离开关操作产生的快速暂态过电压(very fast transient overvoltage,VFTO)给变电站内其他运行设备的安全带来严重危害,提出了一种利用变压器套管传感器测量变压器引线端电压的测量方法。将传感器低压臂部分接到变压器套管末屏上,与套管电容构成VFTO套管传感器;采用卷积模型法处理方波响应结果,获得了传感器响应特性;基于增量Wiener反卷积滤波器的波形还原方法,解决了套管引起的传感器高频响应频率失真问题。在实验室建立了一个快速暂态过程实验平台,在此平台上验证了套管传感器VFTO测量系统的有效性。在某超高压变电站用套管传感器测量了隔离开关操作时高压电抗器处的VFTO,并对测量结果进行了波形还原。测量结果表明,基于变压器套管传感器的VFTO测量系统可以满足现场测量的需要。
The switching operation of disconnectors in gas insulated switchgear（GIS） systems may cause very fast transient overvoltages（VFTO）,which brings about dielectric stress to other apparatus in the substation.A technique for measuring VFTO on transformer entrance with a developed bushing sensor is presented.A capacitor bank was connected with the transformer bushing to construct the bushing sensor.Convolution model based on square wave response experiment was applied to gain the frequency response of the bushing sensor.In order to solve the frequency limitation problem,deconvolution algorithm based on the incremental Wiener filter was used to reconstruct the input transient voltage.A fast transient simulation platform was built in laboratory.Results of the laboratory experiments demonstrate that the measurement system can be used for VFTO measurement.Disconnector switching operations were measured with the developed measuring system in an UHV substation,and the output waveforms from the sensor were recovered with the reconstructed method.Results of the measurement in field imply that the measuring system based on the test tap of transformer bushing can be applied in disconnector operation measurement.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第33期122-128,共7页
Proceedings of the CSEE
