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Neutral Point Round Off Load Tap Changer
Neutral point customized round off load tap changers (OCTC) are used for voltage adjustment in oil-immersed transformers. In contrast to on-load tap-changers, off-circuit tap-changers can operate only when the transformer is de-energized.

The change of voltage is affected by changing the numbers of turns of the transformer provided with taps. For sufficiently close control of voltage, taps are usually provided on the high voltage windings of the transformer.

The tap changer is placed on high voltage side because:
 1)The HV winding generally wound over LV winding hence it is easier to access the HV winding turns instead of LV winding.
 2).Because of high voltage the current through the HV winding is less compared to LV windings, hence there is less “wear” on the tap changer contacts. Due this low current, in on load tap changer the change over spark will be less.

Model Explanation
 WDP ? - ?/?-???

    W:  off-circuit
    D :  single phase
    P :  round type tap chager
    ?:  voltage regulation model
    ?:  rated current
    ?:  rated voltage
    ?:  number of tapping heads
    ?:  number of tapping position
Voltage Regulation Model
    I  :  terminal point
    II :   central point
    III :  neutral point
   IV :  Y-? conversion