Overvoltages in power transformers caused by no-load switching
Journal Article
·
· IEEE Transactions on Power Delivery
- Delft Univ. of Technology (Netherlands). Dept. of Electrical Engineering
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 {tau}. 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.
- OSTI ID:
- 39958
- Journal Information:
- IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 1 Vol. 10; ISSN ITPDE5; ISSN 0885-8977
- Country of Publication:
- United States
- Language:
- English
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