OPERATION
8.1.1. System states
8.1.1.1. Bypass Isolate state
When system control is powered up, the HiPerGuard MV UPS transits to non-operational “Bypass isolate”
state:
– MV input breaker(s) (S
in
), output circuit breaker (s) (S
out
) both open.
– MV bypass circuit breaker (S
abp
) closes.
– MV UPS(s) is (are) not running.
8.1.1.2. Starting state
When a START request is received, the HiPerGuard MV UPS transits to “Starting state”
– HiPerGuard MV UPS(s) output voltage is synchronized to grid input voltage.
– MV input breaker(s) (S
in
), output circuit breaker(s) (Sout) both close.
– MV bypass circuit breaker (S
abp
) opens.
HiPerGuard MV UPS system is now in “Running state”.
8.1.1.3. Running state
When in “Running state” and grid input voltage is within thresholds, HiPerGuard MV UPS(s) transit(s) to
the “PCM_Normal state”:
– HiPerGuard MV UPS(s) regulates output voltage to nominal settings.
– HiPerGuard MV UPS(s) phase locks output frequency to grid frequency.
– Utility grid supplies the load’s active power requirements.
The HiPerGuard MV UPS(s) remain(s) in this state until a power quality event is detected.
8.1.1.4. PCM_Active state
When a power quality event is detected, and the grid voltage is out of threshold, the HiPerGuard MV
UPS(s) transit(s) to “PCM_Active state”:
– The HiPerGuard MV UPS(s) will attempt to ride through the event if it is a shallow surge or sag event.
– If during the event, the grid voltage goes outside the S
in
input breaker(s) management curves, then
the HiPerGuard MV UPS(s) commands (all) S
in
to open.
– After (all) Sin open(s), HiPerGuard MV UPS(s) transit(s) to “Island state” inside the Independent mode
(IM).
8.1.1.5. Island state
While in “Island state” the HiPerGuard MV UPS(s) fully support(s) the load from the energy storage
system and continues to monitor for the return of grid voltage.
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