Power+™ Trip Unit Systems; Trip Target Module - GE Power Break II Manual

Power+™Tr i p Units
Power+™ Trip Unit Systems*
The Power+ trip unit system for Power Break®l l insulated
case b reakers consist of the trip unit. the tri p actuator, cur­
rent sensors and rating pl ugs. The term "trip unit system"
applies to the combination of these four com ponents which
form the solid-state circuit breaker tripping system.
Powe r+ trip units p rovide a complete range of sta ndard and
optional overcurrent and g round-fault protective functions.
Components of Power+ trip u n it system
True R M S Sensing
The Power+ trip unit continues to use GE's proven technique
of measuring true rms cu rrents of both sin usoidal and har­
monically distorted waveforms. The freq uent sampling (48
times per cycle per p hase) allows p recise calculations of true
rms current. The sampling rate allows waveform measure­
ments up to the 1 1th h a rmonic. G E's true rms sensing avoids
potential u nderprotection or ove rp rotection problems associ­
ated with peak-sensing tripping systems.
Accessory Integration
Four accessories a re i nteg rated through the Power+ tri p unit.
Drop-in shunt trip (with o r without lockout). bell alarms (with
or without lockout) and the u ndervoltage release mod ules fit
into keyed pockets. They operate through the trip un its, and
not throug h any external mechanisms. All accessory wiring
is p re-wire d to secondary terminals, and no use r wiring is
necessa ry. When activated, the s h u nt trip (with or without
lockout) and undervoltage release modules send a signal
to the trip unit to energize the trip actuator and open the
breake r.
* For availabil ity on Power+ Trip u n its, contact yo u r G E sales
engineer.
8
Trip Target Module (Optional)
Power+ trip target module (Target 02)
•
View Button: Press the VI EW button to check the trip unit
status.
•
Press the RESET button to clear a ny target
Reset Button:
that is set.
•
Target modules use two standard, 3V,
Battery Check:
16mm x 1.6 mm, l ithium batteries for viewing target
i nformation. Battery life depends u pon use, but may be
estimated at one year. When the batteries a re e ne rgized ,
depressing the VIEW button will illuminate e ither a set
ta rget LED, i.e., LT o r the BAT LED. Once target i n d ica-
tors a re clea red, battery status is indicated by the BAT
LED. Replacement batteries include Panasonic CR1616
Eveready E-CR1616BP, or Duracell DL1616B, which ma
purchased commercially.
•
Long-time pickup: The long-time pickup indicators 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 freq uency increases, until
100% of the pickup point is reached. At that moment, the
LTPU LED stays on continuously until the long-time delay
t1mes out. Once the breaker has tri ppe d o n long-time, the
VIEW
OVL target wi ll be stored in memory. To view the trip, press
the button. To clea r the target , p ress the RESET but­
ton.
•
Short-tim e and instantaneous trips:
instantaneous trips share the same trip ta rget. The LTPU
LED is not illumin ated, since the time intervals between
pickup and tripping a re too short for e ither function. Once
the breaker has tripped on short-time or i nsta ntaneous
the short ta rget will be stored in memory. To view the tr
p ress the VIEW button. To clear the ta rget, press the RESET
button.
•
Ground fault trip (Ta rgeto2 only):
g round fa u lt is the G F LED. To view the trip, press the VI EW
button. To clear the target, p ress the RESET button.
•
Trip unit health status "okay" is illus­
Health monitor:
trated by slow blinking of the LTPU LED. It may be seen by
depress1ng and holding the VIEW button. Sufficient power
must be supplied to the trip un it via external test kit , power
pack, or cu rrent transformers for the health monitor to be
operational.
y
be
S hort-time and
,
ip,
The trip ta rget for a