MR MESSKO MPREC, Руководство по эксплуатации

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6 Commissioning
41 BA5789879-01 EN
Check that the protective relay is functioning correctly before commissioning
the transformer / on-load tap-changer. You will find a description of the func-
tion test in the following.
A case where one micro-switch of the pressure relief device is wired to the
tripping circuit of the circuit breaker that de-energizes the transformer in the
event of an error is used as an example.
If you have connected the micro-switches to another device, check the re-
sponse to the change in switch position on that device (steps 6, 9 and 11).
1. Fully de-energize the transformer, lock to prevent it from being switched
back on, and ensure that it is de-energized.
2. Ground and short-circuit the transformer on the high-voltage side and low-
voltage side. Ensure that the grounding for work is not removed during
testing.
3. WARNING! If the micro-switches also trip the fire extinguishing unit in
the event of an error, deactivate the fire extinguishing unit prior to the
function test. Otherwise, the unintended tripping of the fire extinguishing
unit can lead to death due to asphyxiation. Check the signal transmission
in accordance with the fire extinguishing unit operating instructions or con-
tact the manufacturer.
4. Pull the signal pin out of the housing into the position alarm to actuate the
micro-switches, see [ ► Section 7.1, Page 43].
5. Leave the transformer's danger zone.
6. Ensure that the transformer's circuit breaker cannot be closed.
ð Passive protection test
7. Push the signal pin of the pressure relief device into the housing to return
the micro-switches to the operation position.
8. Leave the transformer's danger zone.
9. Close the transformer's circuit breaker with disconnecting switches open
and the transformer grounded on all sides.
10. Pull the signal pin out of the housing into the position alarm to actuate
the micro-switches.
11. Check whether the transformer's circuit breaker has tripped.
ð
Active protection test
12. Return the signal pin of the pressure relief device to the operation posi-
tion.