access icon openaccess Research on the fitting method to describe the mathematical expression of VFTO in GIS

This is an open access article published by the IET under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 29/08/2018, Accepted 19/09/2018, Published 24/10/2018

Very fast transient over voltage (VFTO) is a unique electromagnetic transient phenomenon occurring in Gas Insulated Substation (GIS), which determines the insulation level of the GIS (above 330 kV). Unfortunately, up to the present, there is no standard VFTO waveform to test the high voltage equipment to ensure the safety of power grid. For this reason, this paper focuses on obtaining the standard VFTO waveform through finding a method to fit the curve of VFTO. Hence, a UHV disconnector operation experiment of GIS was carried out on the UHV GIS test platform. The representative waveform of VFTO generated by a single SF6 gas discharge was extracted from the measured data. Furthermore, The Fast Fourier Transformer is applied to analyze the frequency features of VFTO. As one of the switchgear operation voltage, VFTO can be concluded to be a superposition of the power-frequency waveform with the non-periodic impulse waveform. Thus, it is found that The Squares Method is convenient for fitting the expression of VFTO according to its transient characteristics. Then the standard VFTO waveform can be obtained from the fitting expression, which coincides well with the measured waveform. The simulation results using ATP-EMTP software are compared with the calculation results and the measured results.

Inspec keywords: transients; gas insulated switchgear; overvoltage protection; power grids; EMTP; curve fitting; discharges (electric); switchgear

Other keywords: fitting method; UHV disconnector operation; non-periodic impulse waveform; UHV GIS test platform; GIS insulation level; electromagnetic transient phenomenon; SF6 gas discharge; mathematical expression; high-voltage equipment; standard VFTO waveform; VFTO impulse test; power grid safety; power–frequency waveform; ATP-EMTP software

Subjects: Interpolation and function approximation (numerical analysis); Switchgear; Inorganic insulation

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