Vanguard CT-8000 S3 - Manual (Page 7)

REV 1 CT-8000 S3 USER’S MANUAL
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1.0 INTRODUCTION
1.1 General Description and Features
The CT-8000 S3 is Vanguard's fourth generation EHV circuit breaker analyzer. The CT-8000 S3 is
available with 3 (part number 9103-UC) or 6 contact timing channels (part number 9104-UC).
The CT-8000 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. Also, an
outstanding feature of the CT-8000 S3 is the ability to perform dynamic resistance tests on
circuit breaker contacts.
Dynamic Contact Resistance Test
The CT-8000 S3 can perform dynamic-resistance tests using a 200-ampere, built-in, DC power
supply. One channel is available for performing a dynamic contact resistance test. The
resistance measuring range is from 1 micro-ohm to 1,999 micro-ohms. The resistance chart can
be used to analyze the circuit-breaker contact condition during the CB operation. This
important feature can help detect circuit-breaker contact erosion or other contact problems
that cannot be detected in static resistance tests. The CT-8000 S3 can also be used as a 200-
ampere micro-ohmmeter to test circuit-breaker contact resistance and bus connections, or can
be used for other applications where a low-resistance measurement is required.
Contact Timing Input Channels
The CT-8000 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. The CT-8000 S3's timing window is selectable between 1 second, 10 seconds, and 20
seconds.
Resistor Type Transducer Inputs
The CT-8000 S3 offers 3 resistor type transducer input channels. These input channels are used
to interface with any resistor-type transducers to monitor the circuit breaker motion.
Transducer resistance ranges from 200 Ohms to 10K Ohms.
Breaker Stroke and Velocity
Three dedicated digital travel transducer channels are available on the CT-8000 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-8000 S3. Special feature
is also available to “Slow-Close” test the circuit breaker and obtain a test result report.