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Transformer Riddle No.95 - Transformer impedance
In the case of transformer with on load tap changing,percentage impedence changes with the tap changing and fault level reduces when percentage impedence changes.Then how is the fault level calculation becomes satisfied.We design the transformer with normal percentage impedence.Clarify
Author : Ajay John - From: India
Wed, May 1st, 2013 - 18:28
Short-circuit current calculation according to IEC 60909-0 is carried out based on the method of ‘equivalent voltage source at the short-circuit location. The method is based on the tap-changers of all transformers are assumed to be in main-position (middle position). 
Author : Hamid - From: Iran
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