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Learn how to prepare for transformer acceptance tests and final inspections
Generally speaking, acceptance tests and final inspections of a transformer should not have any improvisations, but they usually do have. The essential purpose in carrying out the final tests on the transformer is to ensure that the design is as…...
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Nov 01, 2021 | By Edvard Csanyi
Low Voltage
4 electrical quantities you MUST fully understand to select the right cast-resin transformer
This the basic question, but it’s important to start from the scratch. Well, distribution transformers link the MV to the LV system and step down the electrical power to be distributed to the intended low-voltage level (e.g. 400 V/230 V… Read more
Nov 13, 2019 | By Edvard Csanyi
Protection
Three good examples of the application of modern relays to transformer protection
This technical article provides three examples of the application of modern relays to transformer protection. As there are many modern protection relays nowadays that provide advanced software to simplify the calculations, in this article we will use earlier Alstom type… Read more
Apr 22, 2019 | By Edvard Csanyi
Electrical Lectures
Three-phase transformer connections and vector groups for beginners
In theory a three-phase transformer works like three separate single-phase transformers with shared limbs in which the magnetic circuit for the outer limbs is longer than for the centre limb. The voltage transformation is determined by the ratio between the… Read more
Sep 19, 2016 | By Edvard Csanyi
Energy and Power
Principles of Transformers in Parallel Connection (part 2)
In ideal parallel operating of power transformers, the current in each transformer is directly proportional to its capacity, and the arithmetic sum equals one-half of the total current. This is rarely accomplished because to minor discrepancies in transformers. Nonetheless, some… Read more
Aug 08, 2012 | By Jignesh Parmar
Energy and Power
Understanding Vector Group of Transformer (Part 2)
Vector Groups are the IEC method of categorizing the primary and secondary winding configurations of 3-phase transformers. Windings can be connected as delta, star, or interconnected-star (zigzag). Winding polarity is also important, since reversing the connections across a set of… Read more
Jun 04, 2012 | By Jignesh Parmar
Electrical Lectures
Understanding Vector Group of Transformer (Part 1)
Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the same iron core. The vector group of the transformer is determined by the connection between the windings… Read more
Jun 03, 2012 | By Jignesh Parmar
