
72A-1898 Rev. A 11/01
D-1
Monday
, November 26, 2001 1:09 pm
Appendix D. Concepts of Operation
The TDR9000 is a multi-purpose data recorder outfitted with different
signal sources and receiver channels depending on the type of circuit
breaker under test. Five Physical Front Panel modules can be populated
into numerous configurations of measurement channels. A sixth module,
the System module, is configured to control the circuit breaker under test,
or initiate recording based on an external trigger input.
Channel Types
There are currently six channel types supported by the TDR9000:
• Main and contact Pre-Insertion resistor switch timing
• Pre-Insertion resistor value
• Motion (using a transducer) channels
• Auxiliary contact channels
• Analog channels
• Capacitance channels
Each channel type, except Capacitance, has a different front end.
However, all channels are collected and forwarded to the controller for
processing in the same manner. Data processing creates measurements
that are compared to specifications (circuit breaker vendor limits or
learned results shared between utilities) resulting in Pass/Fail decisions.
Main Contact Timing
Contact timing is achieved by providing a voltage source (isolated in
pairs for EHV) to the contacts and comparing the voltage across the
contacts to references internal to the TDR9000. A voltage below the
lower threshold (on the order of 5% of the source voltage) is logged as a
Close state. A voltage above the higher threshold (on the order of 95% of
the source voltage) is logged as an Open state. The state is sampled at
10 kHz and stored in a circular buffer for transfer to the computer.
A hardware discriminator qualifies state transitions to eliminate noise and
cable capacitance that might be perceived as switch bounce. The
discrimination time is set to 60 µsec and is sampled at 2 MHz.
Содержание TDR9000
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