A test of parallel operating three-phase transformers with different transformation factrs

• Published in: Russian electrical engineering Vol. 87; no. 11; pp. 601 - 606
• Main Authors: Romodin, A. V., Kuznetsov, M. I.
• Format: Journal Article
• Language: English
• Published: New York Allerton Press 01.11.2016; Springer Nature B.V
• Subjects: Circuit design; Coils (windings); Electric power distribution; Engineering; Load distribution (forces); Machines; Manufacturing; Phase transitions; Processes; Stress concentration; Transformers; electric load; power distribution; transformation factor; three-phase transformer; phase voltage shift
• ISSN: 1068-3712; 1934-8010
• DOI: 10.3103/S1068371216110092

This article presents the results of testing two parallel operating three-phase power transformers with different transformation factors. The practical operation of power engineering systems often makes it necessary to split up the substation transformer capacity, which usually requires installing two parallel transformers instead of one, though with the same total power. The problem arises from this replacement of how to ensure uniform load distribution between the transformers. In the case of similarly designed transformers of equal power uniform load distribution is ensured automatically due to symmetrical parallel circuits. However, if differently designed transformers with different transformation factors are enabled in parallel, the uniformity of load distribution between them will be violated. It has been proven by testing that, with increasing total load, parallel operating transformers with very different transformation factors decrease the consumption of current by windings of the transformer with a higher transformation factor.