Maintenance P54x/EN MT/La4
MiCOM P543, P544, P545 & P546
(MT) 11-5
To reinstall the repaired or replacement relay, follow the above instructions in reverse,
ensurin
g that each terminal block is relocated in the correct position and the case earth,
IRIG-B and fiber optic connections are replaced. To facilitate easy identification of each
terminal block, they are labeled alphabetically with ‘A’ on the left hand side when viewed
from the rear.
Once reinstallation is complete the relay should be re-commissioned using the instructions in
sections 1 to 12 of the Commissioning chapter (P54x/EN CM).
1.3.1.2 Replacing a PCB
Repl
acing printed circuit boards and other internal components of protective relays must be
undertaken only by Service Centers approved by ALSTOM Grid. Failure to obtain the
authorization of ALSTOM Grid After Sales Engineers prior to commencing work may
invalidate the product warranty.
Before removing the front panel to replace a PCB the auxiliary supply must be
removed, and wait 5 s for capacitors to discharge. It is also strongly recommended
that the voltage and current transformer connections and trip circuit are isolated.
ALSTOM Grid Automation Support teams are available world-wide, and it is strongly
recommended that any repairs be entrusted to those trained personnel. For this reason,
details on product disassembly and re-assembly are not included here.
1.4 Re-calibration
1.4.1 P54x relay
Re-cali
bration is not required when a PCB is replaced unless it happens to be one of the
boards in the input module; the replacement of either directly affects the calibration.
Although it is possible to carry out re-calibration on site, this requires test equipment with
suitable accuracy and a special calibration program to run on a PC. It is therefore
recommended that the work be carried out by the manufacturer, or entrusted to an approved
service center.
1.5 Changing the relay battery
Each relay
has a battery to maintain status data and the correct time when the auxiliary
supply voltage fails. The data maintained includes event, fault and disturbance records and
the thermal state at the time of failure.
This battery will periodically need changing, although an alarm will be given as part of the
relay’s continuous self-monitoring in the event of a low battery condition.
If the battery-backed facilities are not required to be maintained during an interruption of the
auxiliary supply, the steps below can be followed to remove the battery, but do not replace
with a new battery.
Before carrying out any work on the equipment, the user should be familiar with the
contents of the safety and technical data sections and the ratings on the equipment's
rating label.
MT
1.5.1 Instructions for replacing the battery
Open the b
ottom access cover on the front of the relay.
Gently extract the battery from its socket. If necessary, use a small, insulated screwdriver to
prize the battery free.
Ensure that the metal terminals in the battery socket are free from corrosion, grease and
dust.
The replacement battery should be removed from its packaging and placed into the battery
holder, taking care to ensure that the polarity markings on the battery agree with those
adjacent to the socket.
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