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Calculating the switching surge critical flashover voltage of phase-to-ground and phase-to-phase bundle conductor gaps

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1 Author(s)
Podporkin, G.V. ; St. Petersburg State Tech. Univ., Russia

The paper presents a method for calculating the 50% breakdown voltages of conductor-to-plane and conductor-to-conductor air gaps for any bundle design, all the three phases of lines being taken into account. The method is developed for switching impulses with long time front (τf=1000-4000 μsec) which are the most typical for UHV lines. The results of calculations are extensively compared with previous experimental results for different bundles and over a wide range of gap spacings. The influence of bundle configuration, type of phases displacement (flat, delta or inverted delta) and voltage distribution among phases for UHV lines are analyzed

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Power Delivery, IEEE Transactions on  (Volume:10 ,  Issue: 1 )