MR VACUTAP VMS, Руководство по эксплуатации

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6 Fault elimination
Maschinenfabrik Reinhausen GmbH 2020 43 5993419/02 EN VACUTAP
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VMS
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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 flap valve of the protective relay is in the OFF or OP-
ERATION position.
6.1.1 Flap valve in OPERATION position
If the flap valve is in the OPERATION position, there may be a fault in the
tripping circuit. Check the tripping circuit in this case. If you are not able to
clarify why the protective relay tripped, be sure to contact Maschinenfabrik
Reinhausen to check the on-load tap-changer.
6.1.2 Flap valve in OFF position
Note that protective relay RS 2004 features an automatic reset mechanism
which means that the flap valve does not remain in the OFF position after
tripping. If the protective relay RS 2004 has not tripped due to an error in
the tripping circuit, also proceed as described below for RS 2004.
If the flap valve is in the OFF position, proceed as follows:
1. Ensure that the transformer is not started up under any circumstances.
2. Contact and inform Maschinenfabrik Reinhausen of the following:
ð
Serial number of protective relay and on-load tap-changer
ð
What was the load of the transformer at the instant of tripping?
ð Was the on-load tap-changer moved immediately before or during trip-
ping?
ð
Did any other protective devices of the transformer respond at the in-
stant of tripping?
ð
Were switching operations in the network being carried out at the in-
stant of tripping?
ð
Were overvoltages registered at the instant of tripping?
3. Take further action in agreement with Maschinenfabrik Reinhausen.
6.1.3 Re-commissioning the transformer
Once the reason for the protective relay tripping has been established and
remedied, you can re-commission the transformer:
1. Check the protective relay [ ► Section 4.1.4.1, Page 35].
2. Commission the transformer.