Time-frequency analysis of very fast transient over voltages for effective shielding of control circuits in a 245kv gas Insulated Substation

2010 International Conference on High Voltage Engineering and Application Pub Date : 2010-11-18 DOI:10.1109/ICHVE.2010.5640850

J. Rama Rao, J. Amarnath, S. Kamakshaiah

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引用次数: 2

Abstract

Very fast transient over voltages (VFTO) and very fast transient over currents (VFTC) are generated during switching operation of disconnectors in Gas insulated substation (GIS). In this paper the accurate GIS model has been developed and VFTO'S and VFTC'S were estimated at bushing termination using EMTP program. The wavelet analysis of VFTO and VFTC signals have been carried out and frequency spectrum of VFTO wave form is obtained. In order to estimate the frequency spectrum more accurate Gabor wavelet function is employed. By using above method the time-frequency spectrum of the VFTO waveform has been calculated at bushing termination in a 245kV GIS system during switching condition. The frequency characteristics of the VFTC have been analyzed using the Fast Fourier Transform (FFT) technique the validity of the wavelet function is confirmed by comparing both the results. This analysis helpful for an effective shielding of the control circuits present within the GIS against transient voltages and currents.

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245kv气体绝缘变电站控制回路有效屏蔽的快速瞬态过电压时频分析

在气体绝缘变电站(GIS)中，隔离开关在切换过程中会产生非常快的瞬态过电压(VFTO)和非常快的瞬态过电流(VFTC)。本文建立了精确的GIS模型，并利用EMTP程序对套管末端的VFTO和VFTC进行了估计。对VFTO和VFTC信号进行了小波分析，得到了VFTO波形的频谱。为了更准确地估计频谱，采用了Gabor小波函数。利用上述方法计算了245kV GIS系统在开关状态下套管端部VFTO波形的时频谱。利用快速傅里叶变换(FFT)技术对VFTC的频率特性进行了分析，并通过对两种分析结果的比较，验证了小波函数的有效性。这种分析有助于有效屏蔽GIS内的控制电路，防止瞬态电压和电流。

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2010 International Conference on High Voltage Engineering and Application

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