Atec CT7500 User Manual
CT-7500 S2
digital circuit breaker analyzer
Vanguard Instruments Company, Inc.
www.vanguard-instruments.com
CT-7500 S2
digital circuit breaker analyzer
The CT -7500 S2 is an easy to use, stand alone or computer-controlled, microprocessordriven 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 circuit 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 operations (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 current breaker-make as detected by an AC clamp-on current sensing probe.
The “on-line” timing mode can detect a breaker’s operating conditions with little or no down time. In this
mode, the fi rst trip operation time of the breaker is captured. 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 mechanism. 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.
1
Conventional Time
Travel Analysis Mode
The CT-7500 S2 is available in models with either 3 (CT-7500-3 S2), 6 (CT-7500-6 S2), or 12
(CT-7500-12 S2) dry-contact inputs. Each contact input channel can detect main contact and
insertion-resistor contact times in milli-seconds
and cycles.
2
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 calculated based on the contact’s travel distance over
a period of time. A special feature is also available to “slow-close” test a breaker and obtain a
test result report.
3
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 transducers. The transducer resistance ranges from 200
ohms to 10K Ohms.
4
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.
ordering information
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
2
CT-7500 S2 Controls & Indicators
1
Contact Timing Channels
RS-232C PC Interface
7
USB PC Interface
Back-lit LCD Screen
(20 characters by 4 lines)
9
Rugged 16-key membrane
5
keypad
Voltage Input Channels
AC Clamp-on Current Probe
Trigger Input Connector
Resistor Type Transducer Connector
Digital Transducer Connectors
Breaker Initiate Output
4.5" Wide Thermal Printer
Breaker Initiate Arm Switch
7
4
6
3
2
5
8
Breaker Initiate Features
A built-in solid-state initiate device is used to
operate a breaker from the CT-7500 S2. The
operational modes include Open, Close, Open–
Close, Close–Open, and Open–Close–Open.
Multiple operations, such as Open–Close and
Open–Close–Open, can be initiated by using
programmable delay time or by sensing a breaker’s contact condition.
A built-in Hall-effect current sensor records
the Trip/Close current level and duration. The
breaker’s operate-coil current waveform duration (effectively, a performance "fi ngerprint" or
"current profi le") can be used as a diagnostic
tool for analyzing a breaker’s performance.
6
CT Input
One non-contact AC current sensor is used to
monitor circuit breaker on-line current for the
“on-line” timing mode.
Computer Interface
The CT-7500 S2 can be computer-controlled via
its RS232C or USB interface. Windows® based
BreakerAnalysis software is provided with each
unit. Using this software, circuit-breakers can
be timed from the PC. Test records can be retrieved from the CT-7500 S2 and then stored on
the PC for future analysis and report generation.
Circuit-breaker test plans can also be created on
the PC and transferred to the CT-7500 S2. Additionally, test records can be exported in Excel,
PDF, and XML formats for further analysis.
8
Built-in Thermal Printer
The CT-7500 S2’s built-in 4.5-inch wide thermal
printer can print the breaker contact analysis results in both tabular and graphic formats.
9
User Interface
The CT-7500 S2 features a back-lit LCD screen
(20 characters by 4 lines) that is viewable in
both bright sunlight and low-light levels. A rugged, 16-key, membrane keypad is used to control
the unit.
Diagnostic Capabilities
The CT-7500 S2 can perform diagnostics on its internal
electronics. Diagnostics can be performed to verify contact cable connections and to test the travel transducer’s
electronics.
Internal Test Record and Test
Plan Storage
Up to 150 test records can be stored in Flash EEPROM.
Test records can be retrieved and printed on the built-in
thermal printer, or they can be transferred to a PC via the
unit’s RS232C or USB interface.
Up to 99 circuit breaker test plans can be stored in Flash
EEPROM. Test plans are comprised of all circuit-breaker
performance specifi cations (stroke, velocity, and contact time). A test plan can be used to immediately test
a circuit-breaker. A pass/fail report is then generated by
comparing actual performance with the specifi cations in
the stored test plan. Test plans can also be generated
on a PC and transferred to the CT-7500 S2 via the unit’s
RS232C or USB interface.
3
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