MR OILTAP R, Installation And Commissioning Instructions, Page: 183 / 206

9 Fault elimination
Maschinenfabrik Reinhausen GmbH 2015 183 4427410/00 EN OILTAP® R
Flap valve in IN SERVICE position
If the flap valve is in the IN SERVICE position, there may be a fault in the
tripping circuit. Check the tripping circuit. If the reason for the protective relay
tripping cannot be found, the diverter switch insert or selector switch insert
must be removed in accordance with the on-load tap-changer's operating in-
structions and checked [
► 183].
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, proceed as described below for RS 2004 too.
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. Remove and inspect diverter switch insert in accordance with corre-
sponding on-load tap-changer operating instructions.
3. Contact Maschinenfabrik Reinhausen and inform them of the following:
▪ Serial number of protective relay and on-load tap-changer.
▪ What was the load of the transformer at the instant of tripping?
▪ Was the on-load tap-changer moved immediately before or during trip-
ping?
▪ Did any other protective devices of the transformer respond at the in-
stant of tripping?
▪ Were switching operations in the network performed at the instant of
tripping?
▪ Were overvoltages registered at the instant of tripping?
Re-commissioning the transformer
Once the reason for the protective relay tripping has been established and
remedied, you can re-commission the transformer:
1.
Ensure that the flap valve is in the IN SERVICE position.
2. Commission the transformer.
9.1.1
9.1.2
9.1.3