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Distribution transformer with OLTC (On load tap changer) is a higher capacity transformer, in which LT voltage remains nearly constant, while there is frequent variations in HT side voltage. A discrete steps are followed for the voltage control. And, the available voltage is based on step voltage. Geneva Operating mechanism is a rotating mechanism with a spindle based on which all moving contacts rotate. A motor is used for rotating the spindle in both the directions, in order to rotate the OLTC moving contacts in both directions. Contact movement is done to control the transformer's output LV voltage. Distribution transformer with OLTC requires periodic maintenance by only a professional. This maintenance include changing the OLTC oil and checking all parts for wear and tear.
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