MR VACUTAP, Operating Instructions Manual

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6 Fault elimination
Maschinenfabrik Reinhausen GmbH 2020 42 5788897/03 EN VACUTAP
®
VVS
®
6.2 Tripping the pressure monitoring device and putting the
transformer back into operation
WARNING
Danger of death or severe injury!
Danger of severe injury or death if on-load tap-changer and transformer are
insufficiently tested.
► Be sure to contact Maschinenfabrik Reinhausen to check on-load tap-
changer and transformer after the pressure monitoring device has been
tripped.
► Only use the equipment again when you are sure there is no damage to
the on-load tap-changer or transformer.
If the circuit breaker is tripped by the pressure monitoring device, proceed as
follows:
1. Establish time of tripping.
2. Determine operating position of on-load tap-changer.
3. As a precaution, block the motor-drive unit by tripping the motor protective
switch to prevent the on-load tap-changer from being actuated by remote
control.
4. Check the on-load tap-changer head cover. If insulating fluid is leaking,
close the oil conservator stop valve immediately.
5. Check whether the pressure monitoring device sensor is in the OFF posi-
tion or OPERATION position.
6.2.1 Sensor in the OPERATION position
If the sensor is in the OPERATION position, there may be an error in the trip-
ping circuit. Check the tripping circuit in this case. If you are not able to clar-
ify why the pressure monitoring device tripped, be sure to contact Maschi-
nenfabrik Reinhausen to check the on-load tap-changer.
6.2.2 Sensor in the OFF position
Proceed as follows if the sensor is in the OFF position.
1. Ensure that the transformer is not started up under any circumstances.