there are several reasons for the over temperature rise：
（1） tap changer is bad connected for there is not enough pressure of the tap changer contact, or the contact is filthy, the contact resistance increases, and the contact get heat, especially after change the tap changer jouint or when
transformer overload operates, it is more easy to cause the bad connection of the tap changer.
（2） short-circuit of the coil turns: the short circuit of the turns make the number of coil turn reduces and therefore the temperature of the short-circuit place rise, and the oil give the purr sound.
（3） short circuit of the core silicon steel sheet: for the reasons of internal force or insulation aging or other reasons, the insulation of the silicon sheet is damaged, and the wortex increases, and thus cause the partial is over-heat.
In the operation, it the temperature rise is too high, it should judge which part has fault on the basis of
transformer sound, the working condition of buchholz relay and other abnormal phenomenon and give the promptly dealment.
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