How to interpret dual rating transformers? You might have seen transformer data with two different values of apparent power, such as e.g. 20/25 MVA or 75/100 MVA. What does it mean and how to deal with dual rating transformers? Transformer rated power A transformer is characterized by its nominal output Read more
What is the definition of short-circuit impedance? Short-circuit impedance, also called impedance voltage, is an important design parameter of a transformer [1]. Thus, it is crucial to understand this parameter. In this brief post we introduce three ways of definition of short-circuit impedance. Definition 1 Short-circuit impedance (reactance and resistance) Read more
What are the transformer guaranteed values? Like other electric equipment also transformers are generally designed in accordance with international standards. There are multiple parameters stated in the technical specification or a data sheet. However, which of them are the transformer guaranteed values? And what does the guarantee actually mean? Does Read more
Transformer design and cost drivers Right now the transformer prices are just sky rocketing. So talking about transformer cost drivers may be like bringing wood to the forest. However, we hope that the world turns normal again. Then, in normal days, there are specific design features and accessories or options Read more
Transformer short circuit impedance Short-circuit impedance of a transformer, impedance voltage or just impedance are terms often used as synonyms. They describe one of the most important transformer parameter: short-circuit impedance. This article, as part of our VFD transformers series [1], presents the short-circuit impedance from VFD design perspective. After Read more