A sequential phase energization technique for transformer inrush current reduction - Part I: Simulation and experimental results

This paper presents a new, simple and low cost method to reduce inrush currents caused by transformer energization. The method uses a grounding resistor connected at a transformer neutral point. By energizing each phase of the transformer in sequence, the neutral resistor behaves as a series-inserte...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2005-04, Vol.20 (2), p.943-949
Main Authors: Yu Cui, Abdulsalam, S.G., Shiuming Chen, Wilsun Xu
Format: Article
Language:English
Subjects:
Activation
Computer simulation
Costs
Delay
Grounding
Inrush current
Laboratories
Low cost
Phase transformations
Power industry
Power quality
Resistors
Surges
Testing
transformer
Transformers
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Description
Summary:This paper presents a new, simple and low cost method to reduce inrush currents caused by transformer energization. The method uses a grounding resistor connected at a transformer neutral point. By energizing each phase of the transformer in sequence, the neutral resistor behaves as a series-inserted resistor and thereby significantly reduces the energization inrush currents. The proposed method has been tested by computer simulation and laboratory experiments. Both results show that the method has a performance similar to that of the resistor pre-insertion scheme. The proposed method is much less expensive, however, since there is only one resistor involved and the resistor carries only a small neutral current in steady-state.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2004.843467