6 Commissioning
3510014218/00 EN
6.1 Filling with oil and performing the venting test
WARNING
Danger of explosion and danger of poisoning!
Explosive gases in the shutter valve can deflagrate or explode
and result in severe injury or death. Inhaling the gases re-
leased can lead to poisoning or suffocation.
► Ensure that there are no ignition sources such as open flames, hot sur-
faces or sparks (e.g. caused by the build-up of static charge, electrical
devices) in the immediate surroundings and that none occur.
► Do not breath in any gas released.
6.1.1 Filling with oil via transformer tank
If the device is to be filled with oil via the transformer tank, proceed as fol-
lows:
ü The isolation valves are fully open.
1. Loosen the 4screws (hex-wrench 4mm) on the cover of the test button
and remove the cover.
2. As soon as the maximum oil level is reached in the conservator, vent the
Buchholz relay (if installed) in accordance with the operating instructions
provided.
3. To vent the shutter valve, remove the protective cap from the drain valve
(wrench size17).
4. Turn the lever of the drain valve counterclockwise to vent the device.
5. As soon as insulating fluid begins to escape, turn the lever of the drain
valve clockwise to close the drain valve.
6. Position the protective cap on the drain valve, screw on hand-tight and
then tighten with maximum one half turn (wrench size17).
7. Pull the test button down 3 to 5 times to completely fill the valve with oil.
ð The float moves up due to the oil surrounding it. This upward motion
also pulls the test button upwards automatically.
8. If you see air bubbles are rising in the inspection window, repeat steps2
through 6 until no more air bubbles rise.
ð The device is filled with oil and vented.
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