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Overvoltages in power transformers caused by no-load switching

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3 Author(s)
G. C. Paap ; Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands ; A. A. Alkema ; L. Van der Sluis

When an unloaded power transformer is switched on via a relatively long cable, sometimes extreme high voltages appear at the secondary side of the transformer. These overvoltages are caused by a resonant phenomenon that occurs when the resonant frequencies of the transformer and the cable match. The resonant frequency of the cable feeder is equal to the reciprocal of 4 times its travel time τ. The resonant frequency of the transformer is determined by its short-circuit inductance and the capacitance which is connected to the secondary winding. In this paper a model of this phenomenon is presented and an example of this resonant phenomenon, leading to the insulation breakdown at the secondary side of a power transformer, is given

Published in:

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