Overview
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Recently, the growing demand for energy conservation and highly efficient
transformers is raising the importance of reducing losses.
The iron loss of the core and the copper loss of the winding cause a raise
in temperature and reduction in the efficiency of a transformer because
the energy is released as heat.
Evaluating the heat generated by the iron and copper losses through simulation
becomes advantageous when designing a transformer.
This example presents the use of a thermal analysis to obtain the temperature
distribution of the heat generated by the iron losses and copper losses
of the three-phase transformer. |
Heat Generation/Temperature Distribution
The heat density distribution of the core is indicated in Fig. 1 and the
temperature distribution of the core and winding are indicated in Fig.
2
The heat generation density is higher on the inside corners of the core
as indicated in Fig. 1. This is caused by the flow of magnet flux concentrated
in the shortest path through the magnetic circuit. The temperature around
the center of the core indicated in Fig. 2 (a) is higher because the heat
generation density is higher at the center leg of the core. For this reason,
the temperature of the winding at the center leg is also higher. |
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