A transformer is a static piece of equipment used either for raising or lowering the voltage of an AC supply with a corresponding decrease or increase in current. It essentially …
There are different types of connection employed for three-phase transformers. The star-star (Y-Y) connection of three-phase transformers is the most economical type of connection for small current and high voltage transformers. The …
By parallel operation of single-phase transformers, we mean two or more transformers are connected to the same supply bus bars on the primary side and to a common bus bar/load on …
An electrical power transformer has to go through a number of transformer testing procedures for confirming its specifications and performances. In this article, you will learn different types of transformer …
Transformer rating is expressed in kVA, not in kW. Rating of a transformer or any other electrical machine reflects its load carrying capability without overheating. Temperature rise (a major threat to insulation) arises due …
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system of electrical equipment. It reflects the presence or absence of …
The phase windings of three-phase transformers are interconnected to give a three-phase, three-or four-wire supply through three different modes of connection. They are mesh or delta connection star connection zigzag connection …
The effects of voltage and frequency variation on the transformer is discussed in this article. Usually, power transformers are not subjected to wide frequency variations. Also, modest voltage variations occur …
A current transformer is an instrument transformer in which the current ratio is within the specified limit. The primary winding is connected in series with the load and carries the …