GE Power Break II Manual page 111

G u id e Form S pecification 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% accu racy.
b. OPTIONAL: Note: If any of the following are included,
all will be included.
1) Voltage, rms, (V). line-to-line or li ne-to-neutral,
±1.5% accuracy.
2) Energy ( kWh, MWh, GWhl total, ±4% accu racy,
user resettable.
3) Demand (kWh, MWH, GWhl over an adj usta ble
time period of 5 to 60 minutes, ±4% a ccuracy.
4) Peak demand (kW, MW). ± 4% accuracy, user
resettable.
51 Real power ( kW, MW). line-to-line, li ne-to-neutral .
±4% accuracy.
6) Total (apparent) power (kVA, MVA). l i ne-to-li ne, line­
to-neutral. ±4% accuracy.
6. OPTIONAL:
The trip unit shall include all of the following p rotec­
tive functions. However, it shall be possible to d isable,
by user-progra m ming, 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 unbala nce, adjustable pickup - 10 to 5 0%,
adjustable delay - 1 to 1 5 seconds.
d. Current unba lance, adjusta ble pickup - 10 to 50%,
adjusta ble delay - 1 to 1 5 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 com m unication
capability as follows:
a. The trip unit through ded icated secondary terminal on
the breaker shall provide a commun ication 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 co unts and
other event signaling shall be retrieva ble by the re­
mote computer.
*With optional Target Module
8. Current sensors shall be mounted on the breaker fra me
and shall use encapsulated construction to protect
against damage and moisture. ( For g rou nd-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 com patible 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. M etering
functions, other than cu rrent, protective relaying and
commun ication functions may req u ire a separate power
su pply within the equipment lineup. The external power
supply shall meet the breaker suppl ier's standard rec­
ommendations for this type of application.
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