MR VACUTAP - Page 71

7 Maintenance
Maschinenfabrik Reinhausen GmbH 2020 715788897/03 EN VACUTAP
®
VVS
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9. Remove screw cap from pipe connection S.
Figure63: Pipe connection S
10. Open vent screw and bleed piping.
11. Close vent screw.
12. Seal vent screw with screw cap.
13. Check the level in the oil conservator and top up with insulating fluid if
necessary.
14. Re-vent the on-load tap-changer head via air-vent valve E1 and the pipe
connection S via the vent screw.
15. Flush the oil suction pipe and take an insulating fluid sample from the oil
compartment via pipe connection S.
16. Record the temperature of the sample immediately after the sample is
taken.
17. Determine the dielectric strength and water content at a sample temper-
ature of 20 °C ± 5 °C. The dielectric strength and water content must
comply with the limit values specified in the technical data (after mainte-
nance).