Open AccessAn impact of harmonic currents, load levels and ambient temperatures on transformer loss of life
Author(s) -
Tirada Chegsakul,
Thavatchai Tayjasanant
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1311/1/012047
Subject(s) - transformer , distribution transformer , energy efficient transformer , electrical engineering , transformer effect , current transformer , linear variable differential transformer , isolation transformer , materials science , environmental science , engineering , voltage
This paper presents an analysis of thermal effect to transformer. The hottest-spot temperature of winding in transformer indicates the damage of thermal effect. The basic measured data, transformer parameters and ambient temperatures are used for estimating the hottest-spot temperature and transformer life when transformer supplies linear loads and nonlinear loads. The 50 MVA oil-immersed power transformer was investigated with field measurement data at Navanakorn4 substation in Pathum Thani. The results showed load level, harmonic current and ambient temperature are the factors which have impacts on transformer by increasing the hottest-spot temperature. The transformer life when increases the level of these factors is analyzed. When transformer supplies only linear loads, its life does not reduce from specification although load level and ambient temperature are increased. For the case of transformer supplies nonlinear load, harmonic current increases load level and transformer losses. Therefore, transformer life can be reduced when increasing the level of load, harmonic current and the ambient temperature.