GE WavePro LVPCB, Инструкция по применению

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12
Trip Units — Power+™
Power+™ Trip Unit Systems
The Power+ trip unit system for WavePro™ low voltage
power circuit breakers consists of the trip unit, the trip
actuator, current sensors and rating plugs. Power+ trip
units provide a complete range of standard and optional
overcurrent and ground-fault protective functions.
Components of Power+ trip unit systems
True RMS Sensing
The Power+ trip unit continues to use GE’s proven tech-
nique of measuring true rms currents of both sinusoidal
and harmonically distorted waveforms. The frequent sam-
pling (48 times per cycle per phase) allows precise calcula-
tions of true rms current. The sampling rate allows wave-
form measurements up to the 11th harmonic. GE’s true rms
sensing avoids potential underprotection or overprotection
problems associated with peak-sensing tripping systems.
Trip Target Module (Optional)
• View Button: Press the VIEW button to check the trip unit
status.
• Reset Button: Press the RESET button to clear any target
that is set.
• Battery check: Target modules use two standard, 3V, lithi-
um batteries for viewing target information. Battery life
depends upon use, but may be estimated at one year.
When the batteries are energized, depressing the VIEW
button will illuminate either a set target LED, i.e., OVL
or the BAT LED. Once target indicators are cleared, bat-
tery status is indicated by the BAT LED. Replacement
batteries include Panasonic CR1616, Eveready E-
CR1616BP, or Duracell DL1616B, which may be pur-
chased commercially.
• Long-time pickup: The long-time pickup indicator moves
through two transitions. As the current in any phase
reaches 95% of its setpoint, the LTPU LED begins to
flash. As current increases, flashing frequency increases,
until 100% of the pickup point is reached. At that
moment, the LTPU LED stays on continuously until the
long-time delay times out. Once the breaker has tripped
on long-time, the OVL target will be stored in memory.
To view the trip, press the VIEW button. To clear the tar-
get, press the RESET button.
• Short-time and instantaneous trips: Short-time and instanta-
neous trips share the same trip target. The LTPU LED is
not illuminated, since the time intervals between pickup
and tripping are too short for either function. Once the
breaker has tripped on short-time or instantaneous, the
SHORT target will be stored in memory. To view the trip,
press the VIEW button. To clear the target, press the
RESET button.
• Ground fault trip (TargetO2 only): The trip target for a
ground fault trip is the GF LED. To view the trip, press
the VIEW button. To clear the target, press the RESET
button.
• Health monitor: Trip unit health status “okay” is illustrated
by slow blinking of the LTPU LED. It may be seen by
depressing and holding the VIEW button. Sufficient
power must be supplied to the trip unit via external test
kit, power pack, or current transformers for the health
monitor to be operational.
Power+ trip target module
Table 12.1 WavePro Breaker Power+ Trip Unit Target Module
Power+ Trip Unit Suffix Power+ Target Module Catalog Number
(none) TARGET00 (blank)
T1 TARGET01 (w/0 GF)
T2 TARGET02 (with GF)