G u id e Form Specification s
5. The trip units shall include the fol lowing metering func
tions, which shall be displayed on the LCD
a. Current, rms (A of kA). each phase, ± 2.5% accuracy.
b. OPTIONAL: Note: If any of the following are included,
all will be included.
1) Voltage, rms, (V). line-to-line or line-to-neutral,
±1.5% accuracy.
2) Energy (kWh, MWh, GWhl total, ±4% accuracy,
user resettable.
3) Demand (kWh, MWH, GWhl over an adj ustable
time period of 5 to 60 minutes, ±4% accuracy.
4) Peak demand (kW, MW). ± 4% accuracy, user
resettable.
51 Real power (kW, MW). line-to-line, line-to-neutral .
±4% accuracy.
6) Total (apparent) power (kVA, MVA). line-to-line, line
to-neutral. ±4% accuracy.
6. OPTIONAL:
The trip unit shall include all of the following protec
tive functions. However, it shall be possible to disable,
by user-programming, a ny combination of unwa nted
protective functions.
a. U ndervoltage, adj ustable pickup - 50 to 90%, adjust
able delay - 1 to 15 seconds.
b. Overvoltage, adjustable pickup - 1 10 to 150%, adjust
able delay - 1 to 15 seconds.
c. Voltage unbalance, adjustable pickup - 10 to 50%,
adjustable delay - 1 to 15 seconds.
d. Current unba lance, adjustable pickup - 10 to 50%,
adjustable delay - 1 to 15 seconds.
e. Reverse power, selectable direction, adjustable
pickup-10kW to 990 kW, adjustable delay - 1 to 15
seconds.
7. OPTIONAL: The trip unit shall include communication
capability as follows:
a. The trip unit through dedicated secondary terminal on
the breaker shall provide a communication port for
communication with and access to a remote comput
er via the breaker supplier's standard communication
network and protocol.
b. All metering, setpoints, protective trip counts and
other event signaling shall be retrievable by the re
mote computer.
*With optional Target Module
8. Current sensors shall be mounted on the breaker frame
and shall use encapsulated construction to protect
against damage and moisture. (For ground-fault pro
tection of a four-wire power system, a fourth-neutral
current- sensor shall be mounted in the cable compart
ment, and shall be compatible with the phase overcur
rent sensors.)
9. The trip unit's LCD and programming functions shall be
operable at all times, even when the breaker is either
open or closed under a no-load condition. Metering
functions, other than current, protective relaying and
communication functions may require a separate power
supply within the equipment lineup. The external power
supply shall meet the breaker supplier's standard rec
ommendations for this type of application.
111
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