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Modeling of Switching Over Voltages on Ship Service Transformers
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| Author(s) |
Lihua HU, Martin BUTCHER |
| Abstract |
The phenomenon of transient over-voltages during the switching of an HV/LV ship’s service transformer is analyzed in this paper. The system conditions which lead to these worst case switching over-voltages are: •Travelling switching wave and reflections;•Re-strikes of vacuum circuit breakers;•Saturation of the transformer which may inversely charge the power cable;•A load characteristic that causes current surge at the switching instant inversely charging the cable.A simplified model has been developed and then been used to simulate the switching over-voltages. The main conclusions reached from this work are:•The simplified model is sufficient to model predict the transient over-voltages following the switching of a transformer.•The worst case over-voltage could reach levels as high as 5.0 pu;•Damping filters or surge suppressors can be used to control the over-voltages to acceptable levels, at approximately 2.0 pu. |
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| Filename: | 0064-epe2011-full-10582427.pdf |
| Filesize: | 149.7 KB |
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| Type |
Members Only |
| Date |
Last modified 2012-01-26 by System |
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