Vanguard CT-7000 S2 - Manual (Page 7)

REV 2 CT-7000 S2 USER’S MANUAL
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1.0 INTRODUCTION
1.1 General Description and Features
The CT-7000 S2 is Vanguard’s third generation, stand-alone, microprocessor-driven EHV circuit-
breaker analyzer. This inexpensive and easy to use analyzer is available in models with either 3
(CT-7000-3 S2), 6 (CT-7000-6 S2), or 12 (CT-7000-12 S2) dry-contact inputs. The CT-7000 S2 can
fully analyze a circuit-breaker’s performance by testing the contact time, stroke, velocity, over-
travel, and contact wipe. Contact-motion analysis can be performed for all breaker contact
operations (Open, Close, Open – Close, Close – Open, and Open – Close – Open). The CT-7000
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.
Contact Timing Inputs
Dry-contact input channels are used for timing circuit-breaker contacts. Each contact input
channel can detect main contact and insertion-resistor contact times in milliseconds and cycles.
Voltage Monitoring Inputs
One analog voltage input channel is dedicated to monitoring a circuit-breaker’s DC power
supply or coil voltage (0 – 255 volts, DC or peak AC). One digital voltage input channel is
dedicated to detecting the voltage on/off status (presence or absence) of an A/B switch.
Trip/Close Current Monitoring
A built-in Hall-effect current sensor records the Trip/Close current level and duration. The
breaker’s operating-coil current waveform duration (effectively, a performance "fingerprint" or
"current profile") can be used as a diagnostic tool for analyzing a breaker’s performance.
Breaker Stroke and Velocity
Three digital travel transducer channels are available on the CT-7000 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. The CT-7000 S2 can also
perform a special “slow-close” test that can measure the circuit breaker contact touch and
contact wipe.
Resistor Type Transducer Input
One optional resistor type input channel is also available on the CT-7000 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.
Breaker Initiate Features
A built-in solid-state initiate device is used to operate a breaker from the CT-7000 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.