i-manager Publications

Analysis of VFTOS across Insulating Flange of 420 Kv Gis

A. Raghu Ram*

* Associate Professor, Department of Electrical and Electronics Engineering, J.N.T.U.H College of Engineering, Hyderabad, India.

** Manager, Balanagar, Hyderabad, India.

Periodicity:June - August'2012
DOI : https://doi.org/10.26634/jele.2.4.1899

Abstract

In gas insulated substations(GIS) very fast transient overvoltages(VFTO) are generated due to disconnector switching operations. Disconnector switches are primarily used to isolate the operating sections of HV installation from each other as a safety measure. Very fast transient over voltages at an insulating flange are generated due to propogation of VFTOs on the conductor of a gas bus in GIS.Genaration of VFTOs causes sparkovers across insulating flange of high pressure oil filled cable/GIS interface.The ionised path formed by the sparkovers create low impedance path for power frequency fault current, resulting in flange damage with serious consequences.This paper deals wih the generation of VFTOs across insulating flange and their suppression using shunting bars and capacitors for providing protection have been analyzed and reported using MATLAB 7.0.

Keywords

Very Fast Transient over Voltages (VFTO), GIS, Insulating Flange, MATLAB 7.0.

How to Cite this Article?

A. Raghu Ram and M. Mohana Rao (2012). Analysis of VFTOS across Insulating Flange of 420 KV GIS. i-manager’s Journal on Electronics Engineering, 2(4), 14-20. https://doi.org/10.26634/jele.2.4.1899

References

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[2]. Dr. M. Mohan Rao, M. Joy Thomas and B.P. Singh (2002). “Frequency spectrum analysis of fast transient currents (FTC) due to switching operations in 245KV GIS” IEEE Transactions on Power Delivery in year.

[4]. YoshibuminYamagata, Yasuhiko Nakada, of Tokyo electrical power Co., Japan, (1999). “Very fast transients in 1000KV Gas Insulated Switchgear” IEEE Transactions on Power Delivery in the year.

[5]. N. Fujimoto, S.J. Croall and S.M. Foty (1988). “Techniques for the Protection of Gas Insulated Substation to Cable Interfaces” IEEE Transactions on Power Delivery, Volume 3, No 4, October.

[6]. Ogawa S., Hanginomori E., (1986). 'Estimation of Restriking Transient overvoltage on Disconnecting Switch for GIS', IEEE Tans. P.S., Vol. PWRD-1, No.2, PP.95-101.

[7]. Witzman R., (1987). 'Fast Transients in Gas Insulated substations – Modelling of Different GIS components', Fifth ISH, Braunschweig, paper No. 12.06.

[8]. Yanabu S., (1990). 'Estimate of Fast Transient over Voltage in Gas Insulated Substation', IEEE Trans. P.D, Vol.5, No.4, pp.1875-1881.

[9]. Alvinson et al., (1988). 'Very fast Transient Phenomena associated with Gas Insulated Substations', CIGRE – Report 33-13.

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Analysis of VFTOS across Insulating Flange of 420 Kv Gis

Abstract

Keywords

How to Cite this Article?

References

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