MR OILTAP R, Installation And Commissioning Instructions

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5 Mounting
Maschinenfabrik Reinhausen GmbH 2015 83 4427410/00 EN OILTAP® R
Vapor-phase drying in the autoclave
For vapor-phase drying in the autoclave, you must open the kerosene drain
plug in the oil compartment base before drying so that the kerosene conden-
sate can drain from the oil compartment.
1.
NOTICE!
Unscrew kerosene drain plug between oil compartment base
and selector gear clockwise until it starts to get hard to turn. Never un-
screw the kerosene drain plug all the way.
Figure 83: Kerosene drain plug
2.
NOTICE!
Remove the on-load tap-changer head cover (24 screws M10/
wrench size 17 with safety elements) and store it outside the autoclave.
If this is not done, the on-load tap-changer head cover may be dam-
aged.
3.
NOTICE!
Remove on-load tap-changer accessories (motor-drive unit,
drive shaft, protective relay, pressure monitoring device, pressure relief
device, bevel gear, temperature sensor, oil filter unit) and store outside
autoclave. If this is not done, the on-load tap-changer accessories may
be damaged.
Vapor-phase drying in the autoclave
1. Supply kerosene vapor at a temperature of around 90 °C. Keep this
temperature constant for 3 to 4 hours.
2. Increase the kerosene vapor temperature by approx. 10 °C/hour to the
desired final temperature (125 °C maximum on the on-load tap-chang-
er).
3. Vacuum dry on-load tap-changer at between 105 °C and maximum 125
°C for at least 50 hours.
4. Residual pressure of no more than 10 -3 bar.
NOTICE!
Close kerosene drain plug (tightening torque 20 Nm). An open
kerosene drain plug leads to oil escaping from the oil compartment and
therefore to damage to the on-load tap-changer and transformer.
5.3.5.2