Local overheating of transformers with high currents. Issue 2 (2nd March 2015)

• Record Type: Journal Article
• Authors: Sitar, Robert; Janić, Žarko; Štih, Željko
• Editors: Slawomir Wiak, Professor
• Is Part Of: Compel. Volume 34:Issue 2(2015)
• Page Start: 550
• Page End: 560
• Publication Date: 2015-03-02
• Subjects: Magnetic fields -- Transformers -- Thermal analysis -- Eddy current loss -- Coupled phenomena; Electrical engineering -- Data Processing -- Periodicals; Electrical engineering -- Mathematics -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Data Processing -- Periodicals; Electronics -- Mathematics -- Periodicals; 621.3
• DOI: 10.1108/COMPEL-07-2014-0164
• Languages: English
• ISSNs: 0332-1649

Abstract

Abstract : Purpose: – The purpose of the paper is to compare losses and temperatures in power transformer tanks for different high current lead arrangements. Design/methodology/approach: – 3D computational tools MagNet and ThermNet based on the finite element method are used to calculate magnetic field distribution in 3D models of power transformers. Eddy current losses in conducting metal parts are induced by the stray magnetic field of transformer windings and high current leads. From loss distribution and appropriate cooling condition temperature values are calculated. Findings: – From calculation results it is possible to understand advantages and disadvantages of different lead arrangements. The analysis is finalized with a short presentation of the influence of magnetic shielding height on temperature and loss values. Originality/value: – Results give transformer designer clearer understanding of precautions that should be taken for avoiding high temperatures on the tank wall of a transformer.