Energy Storage Depleted - ABB HiPerGuard MV UPS User Manual

Step User Action
3
Table 8.8: System reaction to fault while in IM
8.8.

Energy storage depleted

The energy storage autonomy definition is an essential part of the system design. Depending on the
load conditions, the time which the MV UPS can support the load when operating in Independent mode
can be extended (in case the load is lower than the projected load) or reduced (when operating under
overload condition).
The MV UPS continually monitors the state of charge of the batteries. In case of extended power
outages, before the complete depletion of the energy storage, at the end of the autonomy time, the MV
UPS will switch to the bypass mode.
Step User Action
1 Energy storage depleted
2
3
Table 8.9: System reaction to depleted energy storage
HI PE RG UA RD M V UP S U S E R M A N UA L
System Response
When S is closed or S
abp
out period is elapsed then MV UPS opens S
and S . MV UPS stops the PEBBs and reverts
in
to bypass mode
System Response
Commands to close S
abp
previous state until S
abp
When S is closed then the MV UPS opens
abp
S and S . MV UPS stops the PEBBs and
out in
reverts to bypass mode
O P E R AT I O N
close request time-
abp
out
. MV UPS waits in the
closes
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