I.B. 29C891B
Page 35
Effective 11/98
CIRCUIT BREAKER FOR MAINTENANCE PERSON-
NEL TO USE IN CONTROLLING REMOTE CLOSE OR
TRIP SIGNALS.
The OPTIM Trip Unit can respond to commands from a
remote master computer to trip the circuit breaker remote-
ly. In addition, the trip unit can respond to a close com-
mand from a remote master computer. Upon receipt of a
command to close the circuit breaker, the reclose relay is
energized for 2 seconds. This contact closure results in
the circuit breaker closing, if the circuit breaker is equipped
with the applicable optional electrical operator or spring
release feature.
3-3.4 POWER AND ENERGY MONITORING
Only Digitrip OPTIM 1050 Trip Units can monitor and
then display power and energy values via the
OPTIMizer Hand Held Programmer, Breaker Interface
Module or a remote computer. The displayed informa-
tion is as follows:
• Power (Present Demand) in kilowatts (kW)
• Peak Demand in kilowatts (kW)
• Total Energy in kilowatthours (kWh)
• Forward Energy in kilowatthours (kWh)
• Reverse Energy in kilowatthours (kWh)
An OPTIM 1050 Trip Unit installed in a Series C K, L or
N-Frame Circuit Breaker uses the breaker’s current sen-
sors and an externally mounted potential transformer
module to compute power and energy values (Figure
2-
14
and paragraph 2-7.1). The values are not non-
volatile in memory.
An OPTIM 1050 Trip Unit installed in a Series C R-
Frame, SPB Pow-R or DSII/DSLII Circuit Breaker uses
the breaker’s current sensors and a potential trans-
former module mounted internally to the circuit breaker
to compute power and energy values (Figure
2-14
and
paragraph 2-7.2). The values are not non-volatile in
memory.
Power (Present Demand)
The power value, also referred to as present demand, is
displayed in kilowatts (kW). It is a power value averaged
over approximately one second.
Peak Demand
The peak demand, displayed in kilowatts (kW), is based
on a sampling window of fifteen (15) minutes. Power is
repeatedly averaged over this interval and the maximum
15 minute average is displayed as peak demand. When
the trip unit is first energized, there is a delay of 15 min-
utes before the first non-zero value is displayed. The
peak demand value displayed remains and is not
changed until a higher peak demand is calculated in a
subsequent 15 minute window.
Energy
Energy values are displayed in kilowatthours (kWh), and
are a summation of the average power over time. Energy
values are updated approximately once a second.
• Forward energy is based on load current flow from the
“Line” side to the “Load” side of the breaker.
• Reverse energy is based on load current flow from the
“Load” side to the “Line” side of the breaker.
3-3.5 POWER QUALITY (HARMONICS)
MONITORING
Only Digitrip OPTIM 1050 Trip Units can calculate and dis-
play via the OPTIMizer Hand Held Programmer, Breaker
Interface Module or a remote computer power quality
information. The displayed information is as follows:
• THD magnitude of phase A, B and C currents
• THD magnitude of ground or neutral currents
• % harmonic content phase A, B and C currents (to
27th harmonic)
• % harmonic content ground or neutral currents (to
27th harmonic)
THD (Total Harmonic Distortion) indicates the amount of
harmonic current present as a percentage of the RMS
value of the 60 Hz component of the line current. This
measure of distortion can be useful in a troubleshooting
mode to detect individual circuit breaker load currents
that could lead to system overheating problems and
subsequent early equipment failure.
3-3.6 POWER FACTOR
Digitrip OPTIM 1050 Trip Units calculate the system
power factor, which is a unit-less ratio of real power
(kW) to apparent power (kVA). The power factor is dis-
played by the OPTIMizer Hand Held Programmer,
Breaker Interface Module or a remote computer. A pos-
itive number indicates a lagging current.
3-4 COMMUNICATIONS
Model 750 and 1050 units and Model 550 with field
upgrade to IMPACC have the ability to communicate
both information and control signals via the INCOM
Communications Network. INCOM interconnects micro-
processor based electrical distribution and control prod-
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