Lightning overvoltage protection of the Paddock 362-145 kV gas-insulated substation

Elahi, H.; Sublich, M.; Anderson, Mark E.; Nelson, Bob

doi:10.1109/61.107267

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…Therefore, installing an additional surge capacitor at transformer HV terminal is very useful to mitigate the effects of VFT. However, a surge capacitor paralleled with the surge arrester may be used as a wave modifier .…”

Section: Influence Of Capacitance Components On the Very Fast Transientmentioning

confidence: 99%

Suppression of very fast transients in gas‐insulated substation via terminal and capacitance components—feasibility study

Tavakoli

Gholami

Alamuti

2011

Int Trans Elec Energy Syst

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SUMMARY Reportedly, the switching operation in a gas‐insulated substation (GIS) can lead to deformation of transformer winding. Also, electromagnetic fields radiated because of switching operations get coupled to the control equipment or data cables present in the GIS. These problems during switching operations in the GIS depend on the wave shape of the very fast transient overvoltages (VFTOs) and the associated very fast transient currents (VFTCs). Available methods are utilizing ferromagnetic rings and resistors to suppress the stresses created by very fast transient (VFT) from the source side. These equipment are mounted on the conductors linked to the disconnector. However, current methods are only applicable before installation period and during the substation design stage. The aim of this paper is to investigate feasible methods for mitigation of the overvoltage magnitude of VFT and suppression of the resonant frequencies amplitude at the power transformer. The proposed method utilizes terminal and capacitance components to suppress VFTs in GIS. Its advantages are their simplicity and low cost of implementation along with producing minimal changes in the installed GIS. The effectiveness of the proposed method to mitigate overvoltage magnitude and resonant frequencies amplitude of VFT is presented via simulation. In addition, the amplitude and frequency spectrum of the VFTO and VFTC at the various locations have been analyzed in this paper. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Influence Of Capacitance Components On the Very Fast Transientmentioning

confidence: 99%