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OVR-15, 27 & 38 LV cabinet Instruction Manual
14
A
NNEXURE
I
: T
YPICAL FUNCTIONAL CHARACTERISTICS OF SEALED
LEAD ACID BATTERIES
This Annexure belongs to the typical functional characteristics of the batteries used in OVR three phase reclosers.
There are two 12 V batteries connected in series in each LV control cabinet of the OVR reclosers. Please check the
AH rating pertaining to your recloser from the order related drawings.
Storage Characteristics /Self
Discharge Characteristics:
In case of delay in commissioning of
the reclosers, the battery should not
be left unattended as the self-
discharge characteristic of battery
limits the storage period. Storage
temperature has significant impact
on the storage period as shown in
adjacent graph. Hence, under
circumstances of extended storage
of recloser control cabinet, it is
recommended to charge the
batteries typically after every three
months.
Open Circuit Voltage
Characteristics:
When the batteries provided with
OVR recloser are in healthy
condition, the remaining capacity
on the battery at different open
circuit voltage across each battery
terminal is indicated in the adjacent
graph.
OVR will continue to function on the
battery back-up as long as the
combined battery voltage is above
21.5 V (10.75 V per battery). If
battery bank voltage falls below
21.5 V, OVR will provide a BATTERY
NOT OK indication and will initiate
load management algorithm with
disconnection of loads like relay
and communication modem to
avoid battery going into deep
discharge mode.
