MR VACUTAP - Page 67

7 Maintenance
Maschinenfabrik Reinhausen GmbH 2020 675788897/03 EN VACUTAP
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VVS
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2. Remove the screw cap on air-vent valve E1 on the on-load tap-changer
head cover.
Figure56: Air-vent valve E1
3. Use a screwdriver to lift the valve tappet on air-vent valve E1.
ð The gas under the on-load tap-changer head cover escapes. In this sit-
uation, ensure sufficient ventilation.
Figure57: Valve tappet
4. Once the gas has been discharged and insulating fluid is flowing out of
the air-vent valve, close the air-vent valve.
5. Close the stop-cock between the oil conservator and on-load tap-changer.
6. Open air-vent valve E1 again and extract approximately 5–10 liters of in-
sulating fluid via the pipe connection S until the area under the on-load
tap-changer head cover is free of insulating fluid.