Atec Vanguard-CT7500 - Manual (Page 2)

CT-7500 S2
digital circuit breaker analyzer
The CT -7500 S2 is an easy to use, stand alone or computer-controlled, microprocessor-
driven EHV circuit breaker analyzer. It can operate either in Time Travel analyzer mode or
in “on-line” timing mode. In Time -Travel mode, the CT -7500 S2 can fully analyze a cir-
cuit breaker’s performance by testing the contact time, stroke, veloci ty, over travel, and
contact wipe. Contact motion analysis can be performed for all circuit breaker opera-
tions (Open, Close, Open – Close, Close – Open, and Open – Close – Open). The CT- 7500
S2’s timing window is selectable between 1 second, 10 second, or 20 second periods.
The 10 second and 20 second timing windows are ideal for timing long duration events
such as circuit switcher contact testing.
“On-line” Timing Mode
In addition to the conventional off-line timing mode,
the CT-7500 S2 also offers an “on-line” timing mode. In
this mode, the CT-7500 S2 captures the breaker’s trip or
close time, the trip/close coil current “fi ngerprint,” and
the battery supply voltage while the breaker is still in
service. The trip/close time is derived from the time of
trip, or close coil initiation, to the breaker’s bushing cur-
rent breaker-make as detected by an AC clamp-on cur-
rent sensing probe.
The “on-line” timing mode can detect a breaker’s op-
erating conditions with little or no down time. In this
mode, the fi rst trip operation time of the breaker is cap-
tured. If a breaker has been in service for a long period
of time and sitting in close position, the fi rst trip time of
the breaker may be slow possibly due to a sticky mecha-
nism. The “on-line” mode is very useful in such cases
because traditional breaker timing may not detect this
condition since several operations may have occurred
before the fi rst timing test is conducted.
Conventional Time
Travel Analysis Mode
The CT-7500 S2 is available in models with ei-
ther 3 (CT-7500-3 S2), 6 (CT-7500-6 S2), or 12
(CT-7500-12 S2) dry-contact inputs. Each con-
tact input channel can detect main contact and
insertion-resistor contact times in milli-seconds
and cycles.
Breaker Stroke and
Velocity
Three digital travel transducer channels are
available on the CT-7500 S2 for measuring
circuit-breaker velocity, stroke, over-travel, and
bounce-back. Unlike other transducer types, the
digital transducer requires neither calibration
nor setup. A breaker’s contact-velocity is calcu-
lated based on the contact’s travel distance over
a period of time. A special feature is also avail-
able to “slow-close” test a breaker and obtain a
test result report.
Part number CT-7500-3 S2 CT-7500 S2 with 3 contact channels, cables, and PC software
Part number CT-7500-6 S2 CT-7500 S2 with 6 contact channels, cables, and PC software
Part number CT-7500-12 S2 CT-7500 S2 with 12 contact channels, cables, and PC software
Part number CT-7500-CASE CT-7500 S2 shipping case
Part number Paper-TP4 Thermal printer paper
ordering information
Resistor Type Transducer
Input
One resistor type input channel is also available
on the CT-7500 S2. This input channel allows
the unit to measure circuit-breaker motion by
directly interfacing with resistive type transduc-
ers. The transducer resistance ranges from 200
ohms to 10K Ohms.
Voltage Monitoring
Inputs
One analog voltage input channel, designated as
V1, is dedicated to monitoring a circuit-breaker’s
DC power supply or coil voltage (0 – 255 volts,
DC or peak AC). A second voltage input channel,
designated as V2, is dedicated to detecting the
voltage on/off status (presence or absence) of
an A/B switch.
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