General toroidal transformer insulation class is B, the maximum temperature is 130℃, the temperature is too high or exceed the temperature will affect the use of the toroidal transformer or even burn the toroidal transformer, through understanding the reason for the high temperature of the toroidal transformer can avoid the occurrence of this phenomenon.
1. Local overheating of the iron core.
The iron core of toroidal transformer is wound by continuous oriented silicon steel tape. During the operation of toroidal transformer, external force damage or aging of insulation of screws may cause insulation damage between silicon steel sheets and increase of eddy current, resulting in local overheating of transformer iron core.
2, there is internal loss.
When the toroidal transformer is in operation, the hysteresis loss of the iron core, eddy current loss and copper loss of the coil are converted into heat, so that the temperature rises, the heat to the surrounding by radiation, conduction and other ways of diffusion, when the heat and heat dissipation reach a state of equilibrium, the temperature of each part tends to be stable. Iron loss (hysteresis loss and eddy current loss) is a basic constant loss, related to the toroidal transformer structure, so in operation can not reduce or eliminate iron loss; The copper loss varies with the load.
3.Short circuit between turns of winding.
If the insulation of several turns adjacent to the toroidal transformer is damaged or aged, there will be a closed short-circuit circulation, which reduces the number of turns of the winding. The short-circuit circulation generates high heat and increases the temperature of the transformer, which will burn the ring transformer in serious cases.
External causes of high toroidal transformer temperature
The ambient temperature is too high will also lead to high temperature toroidal transformer, especially in the hot summer season, to avoid the use of toroidal transformer in the hot outdoor, to prevent exposure to the sun; When using, we should also pay attention to install thetoroidal transformer in a well-ventilated toroidal to ensure its good heat dissipation. The optimum indoor temperature for stable operation of annular transformer is 35℃.
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