There are several failure modes in the power transformer. They are damages caused during the transportations due to, the. Electromagnetic forces caused by a short-circuit current caused on, conductors and insulating materials by over-voltages. And due to ages. When the damage is seen from outside and is judged as, a failure it can be removed by repairing, However,. The large capacity transformer has an iron core and a coil in a tank and the medium and low capacity transformer has a molded. Coil molded. The constructions make the recognition of the damages difficult.
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