MR MESSKO MSAFE, Руководство по эксплуатации

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6 Commissioning
38 7232312/00 EN
5. Position the locking cap on the connection for pneumatics testing, screw
on hand-tight and then tighten with max. one half turn (open-end wrench,
wrench size 14).
ð
The test is complete.
6.3.3 Insulating fluid flow speed too high
This test simulates an excessive insulating fluid flow speed.
ü The Buchholz relay is equipped with the connection for pneumatics test-
ing.
ü The pipes are filled with insulating fluid.
1. Unscrew the locking cap from the connection for pneumatics testing
(open-end wrench, wrench size 14).
2. DANGER! Danger of explosion due to flammable gases. Only use ni-
trogen or compressed air. Connect the gas cylinder to the connection for
pneumatics testing. Secure the gas cylinder against falling. Ensure that all
devices connected to the gas cylinder are connected correctly and tightly
sealed.
3. Introduce nitrogen or compressed air into the Buchholz relay with a pres-
sure of 6.5…8 bar in pulses by briefly opening and immediately closing
the valve again until the flap valve falls.
ð The lower float gauge coupled with the flap valve lowers and the dry-
reed magnetic switch issues a signal.
4. Release the gas via the gas extraction valve.
ð
The lower float gauge returns to its starting position. Check the posi-
tion of the float gauge via the inspection window.
5. If the Buchholz relay is equipped with the reset function, turn the test but-
ton counterclockwise to the stop to return the flap valve to its starting posi-
tion. Check the position of the flap valve via the inspection window.
6. Remove the gas cylinder.
7. Position the locking cap on the connection for pneumatics testing, screw
on hand-tight and then tighten with max. one half turn (open-end wrench,
wrench size 14).
ð
The test is complete.