Areva MiCOM P341, Руководство по эксплуатации

Страница: 88 / 282

P341/EN O/B11 Operation Guide
CHAPTER 3 Commissioning and
Page 34/80 Maintenance
MiCOM P341
8.5 Changing the 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.
8.5.1 Instructions for replacing the battery
Open the bottom access cover on the front of the relay.
Gently extract the battery from its socket. If necessary, use a small 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.
Note: Only use a type
1
/
2
AA Lithium battery with a nominal voltage of 3.6V and
safety approvals such as UL (Underwriters Laboratory), CSA (Canadian
Standards Association) or VDE (Vereinigung Deutscher Elektrizitätswerke).
Ensure that the battery is securely held in its socket and that the battery terminals are
making good contact with the metal terminals of the socket.
Close the bottom access cover.
8.5.2 Post modification tests
To ensure that the replacement battery will maintain the time and status data if the
auxiliary supply fails, check cell [0806: DATE and TIME, Battery Status] reads
‘Healthy’.
Additionally, if further confirmation that the replacement battery is installed correctly
is required, the commissioning test described in section 4.2.2, ‘Date and Time’, can
be performed.
8.5.3 Battery disposal
The battery that has been removed should be disposed of in accordance with the
disposal procedure for Lithium batteries in the country in which the relay is installed.
8.6 Cleaning
Before cleaning the relay ensure that all ac and dc supplies, current transformer and
voltage transformer connections are isolated to prevent any chance of an electric
shock whilst cleaning.
The equipment may be cleaned using a lint-free cloth dampened with clean water.
The use of detergents, solvents or abrasive cleaners is not recommended as they may
damage the relay’s surface and leave a conductive residue.