2.4.2.8
Battery Isolation Protective Device
Module shall have a dc protective device to
isolate the module from the
battery system. The protective device size
and interrupting rating shall
be as required by system capacity and shall
incorporate a shunt trip as
required by circuit design. The protective
device shall have provision for
locking in the "off" position.
2.4.3
Inverter Unit
Inverter unit shall be a solid-state device capable of accepting power from
the dc bus and providing ac power within specified limits.
2.4.3.1
Output Overload
The inverter shall be able to sustain an overload as specified across its
output terminals. The inverter shall not shut off, but shall continue to
operate within rated parameters, with inverse-time overload shutdown
protection.
2.4.3.2
Synchronism
The inverter shall normally operate in phase-lock and synchronism with the
bypass source. Should the bypass source frequency deviate beyond 60 Hz by
more than 0.5 Hz, the internal frequency oscillators contained in the power
module shall be used to derive the new frequency reference. Upon
restoration of the bypass source within the required tolerance, the
inverter shall resynchronize with that source at a slew rate not exceeding
the specified rate. The oscillator shall be temperature compensated and
shall be manually adjustable. The design of the oscillator and
synchronizing circuits shall be such that failure of any associated
component, connector pin, terminal lead wire or dc power source in either
the open or shorted mode shall affect only one inverter leg. Such failure
shall not cause transient disturbance of the critical load in excess of the
stated limits.
2.4.3.3
Phase Balance
Electronic controls shall be incorporated to provide individual phase
voltage compensation to obtain phase balance.
2.4.3.4
Modular Construction
Each control logic printed circuit board shall be electrically and
physically packaged on an individual plug-in module with separate
indication and adjustments.
2.4.3.5
Output Protective Device
The output protective device shall be capable of shunt tripping and shall
have interrupting capacity as specified. Protective device shall have
provision for locking in the "off" position.
2.4.3.6
Output Transformer
The inverter output transformer shall be similar to the input transformer
and shall be capable of handling up to [K-13] [_____] nonlinear loads as
described in IEEE C57.110.
SECTION 16265A
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