Fault Current Analysis

Authored by: Robert M. Del Vecchio , Bertrand Poulin , Pierre T. Feghali , Dilipkumar M. Shah , Rajendra Ahuja

Transformer Design Principles

Print publication date:  August  2017
Online publication date:  August  2017

Print ISBN: 9781498787536
eBook ISBN: 9781315155920
Adobe ISBN:


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It is necessary to design transformers to withstand various possible faults, such as a short to ground of one or more phases. The high currents accompanying these faults, approximately 10–30 times normal, produce high forces and stresses in the windings and support structure. Also, depending on the fault duration, significant amounts of heat may be generated inside the unit. The design must accommodate the worst case fault that can occur from both the mechanical and thermal standpoints.

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