Vanguard CT-7000 S3 - Manual (Page 9)

REV 1 CT-7000 S3 USER’S MANUAL
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Diagnostic Capabilities
The CT-7000 S3 can perform diagnostics on its internal electronics. Diagnostics can be
performed to verify contact cable connections and to test the travel transducer’s electronics.
1.2 Optional Features
“On-line” Timing Mode
In addition to the conventional off-line timing mode, the CT-7000 S3 also offers an optional
three-phase “on-line” timing mode. In this mode, the CT-7000 S3 captures the breaker’s trip or
close time, the trip/close coil current “fingerprint”, 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 a AC clamp-on current
sensing probes. Trip/Close current waveforms are also captured by an external clamp-on DC
current probe.
The “on-line” timing mode can detect a breaker’s operating conditions with little or no down
time. In this mode, the first 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 first 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 first timing test is conducted.
Dual Ground Testing Mode
With the optional dual ground testing mode, the CT-7000 S3 can measure a CB contact time
with ground being applied to both sides of the bushings. The clamp-on probe is connected to
one side of the CB safety ground straps, and an AC signal is coupled to this strap. A sensor on
the probe will detect a change in the induced AC signal when the CB contact is opened or
closed.
Bluetooth Interface
The optional Bluetooth interface can be used to wirelessly connect the CT-7000 S3 with a PC.