Vanguard CT-7000 S3 - Manual (Page 7)

REV 1 CT-7000 S3 USER’S MANUAL
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1.0 INTRODUCTION
1.1 General Description and Features
The CT-7000 S3 is Vanguard's fourth generation EHV circuit breaker analyzer. The CT-7000 S3 is
available with 3 (part number 9021-UC) or 6 contact timing channels (part number 9100-
UC).The CT-7000 S3 can fully analyze a circuit breaker's performance by measuring the main
contact and resistor contact time, stroke, velocity, over-travel, bounce back and contact wipes.
Both contact and motion analysis can be performed on all circuit breaker operations (OPEN,
CLOSE, OPEN-CLOSE, CLOSE-OPEN, and OPEN-CLOSE-OPEN). The CT-7000 S3's timing window is
selectable between 1 second, 10 seconds, and 20 seconds.
Contact Timing Input Channels
The CT-7000 S3's dry contact timing channels (up to 6 channels) are used to time the circuit
breaker main contacts. Each main contact timing channel is capable of detecting the main
contact and insertion resistor contact time. Timing results are displayed in milliseconds and
cycles.
Breaker Stroke and Velocity
Three dedicated digital travel transducer channels are available on the CT-7000 S3 for
measuring circuit-breaker contact stroke, velocity, over-travel, and bounce back. With the use
of the Vanguard digital travel transducers, neither calibration nor setting is required. Circuit
breaker contact velocity is calculated based on contact’s travel distance over a period of time.
Special formulas to calculate velocity is also accommodated by the CT-7000 S3. Special feature
is also available to “Slow-Close” test the circuit breaker and obtain a test result report.
Resistor Type Transducer Inputs
The CT-7000 S3 offers 3 resistor type transducer input channels. These input channels are used
to interface with any resistor-type transducer to monitor the circuit breaker motion. Transducer
resistance ranges from 200 Ohms to 10K Ohms.
Voltage Monitoring Channels
The CT-7000 S3 features three voltage monitoring input channels (V1, V2, and V3). The V1
voltage channel is dedicated to monitoring the substation DC supply or coil voltage (0-255 V, DC
or peak AC). The nominal and minimum DC supply voltage levels are recorded and printed on
the tabulated report. An analog waveform showing the DC power supply is plotted on the
graphical report. The two digital voltage input channels, V2 and V3, are dedicated to monitoring
voltage on/off status presence or absence of the circuit breaker auxiliary switches. Digital
waveforms showing V2 and V3 activity are plotted on the graphical report. Three timing events
of the V2 and V3 activities are recorded and printed on the tabulated report.