1 3
Testing Static Trip II
TM
Devices
adjustable, and are calibrated in percent of the tripping
transformer rating as shown in the rating table.
5.
The long time element has 6 bands which are field
selectable. The time delay at 6 multiples of pick-up is as
follows:
Band 1—1.12 Seconds
Band 4—9 Seconds
Band 2—2.25 Seconds
Band 5—18 Seconds
Band 3—4.5 Seconds
Band 6—36 Seconds
6.
The short time element and ground element has 3 bands
which are calibrated at minimum, intermediate and
maximum, but are continuously adjustable.
7.
The maximum interrupting time is the maximum length
of time that fault current flows, including arcing time.
8.
Instantaneous maximum interrupting time may be greater
when breakers are closed in on a fault depending on
actual fault conditions. The maximum potential increase
for a 3-phase fault is 0.01 seconds and for a single-
phase ground fault is 0.02 seconds
9.
The lower limit of ground fault recognition if 25 amperes
for RL-800 or RLF-800 and 40 amperes for the RLX-800,
RL-1600. RLX-1600 and RLF-1600.
Testing Static Trip Device on Circuit
Breaker
CAUTION
The static trip circuit is grounded to the circuit breaker frame
through a surge capacitor. Therefore, to insure against
electrical shock be sure to ground the frame when testing
with the circuit breaker out of the cubicle.
NOTE
The test set isolates the power source from its output leads
by an open relay contact in each line except when a test is
being run. In the case of excessive ground current, the test
set will trip out and light the ALARM light.
Connections—
Use Cord Set 1 8-732-1 84-506
Figure 6 shows how to connect the test set leads to the trip
device. The red and black banana plugs may be left discon-
nected for pick-up tests to avoid trigger instability. However,
to operate the stop clock they must be connected to
terminals 8 and 7 as shown. In some cases, it may be
desirable to disconnect these leads to prevent false indica-
tions when testing the circuit breaker tripping action since the
relay circuit may operate faster than the circuit breaker. It is
not necessary to operate the circuit breaker for any static trip
device tests. If it is desired to test the operation of the circuit
breaker, the above tests can be run with the circuit breaker
closed and allowing the trip device to open the breaker.
Disconnect either the red or black lead from the trip device
to assure that the relay in the test set does not interrupt the
current before the circuit breaker can open thus confusing
the test results when operating the circuit breaker .
