Development and Experimental Research of Impedance Converter for VFTO Measurement

2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE) Pub Date : 2022-04-22 DOI:10.1109/CEEPE55110.2022.9783254

Zihan Teng, Weijiang Chen, Jun Zhao, Jiangong Zhang, Qi Wang, Haonan Lu

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Abstract

Very fast transient overvoltage (VFTO) is a special electromagnetic transient in gas-insulated switchgear (GIS). It is necessary to obtain the characteristics of VFTO to guide the insulation design of GIS and the electromagnetic protection of secondary equipment. In this work, we have designed and developed a differential impedance converter by using the compensation between poles and zeros in closed loop circuit and compared its measurement performance with a following type on a 220 kV test platform. The calibration and practical tests results showed that the low cut-off frequency of differential type has been greatly expanded, which can reach 0.1mHz, and the measurement accuracy of very fast transient signal has also been greatly improved than the following type. Thus, the differential impedance converter can fully meet the measurement needs of high-frequency transient voltage, power frequency voltage, and trapped charge voltage in the VFTO waveform. It can be recommended for VFTO test measurement in extra-high voltage (EHV)and ultra-high voltage (UHV) GIS substations and provide accurate data support for insulation design and energy saving of GIS equipment.

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VFTO测量阻抗变换器的研制与实验研究

快速暂态过电压是气体绝缘开关设备中的一种特殊的电磁暂态。了解VFTO的特性对指导GIS的绝缘设计和二次设备的电磁保护是十分必要的。本文设计并开发了一种利用闭环中极零补偿的差分阻抗变换器，并在220kv测试平台上与以下类型的变换器进行了测量性能比较。标定和实际测试结果表明，差分型的低截止频率得到了很大的扩展，可以达到0.1mHz，对极快瞬态信号的测量精度也比差分型有了很大的提高。因此，差分阻抗变换器完全可以满足VFTO波形中高频瞬态电压、工频电压和俘获电荷电压的测量需求。可推荐用于特高压(EHV)和特高压(UHV) GIS变电站的VFTO测试测量，为GIS设备的绝缘设计和节能提供准确的数据支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)

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