
Continuity
2-18
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Contact 1 Make
Initiates the Close Pulse after the time specified in
Delay 1
. The second Trip Pulse occurs when the
TDR9000 senses that a contact make has occurred
on the first of the Main Contacts.
Recording Length
This setting determines the recording length and
implicitly sets the sampling rate at which the
recording is performed.
Continuity
The Continuity test is a system check of the TDR9000’s contact monitor
cable connections to the circuit breaker. This test is run as part of the
Pretest Check List completed just prior to running the test. Refer to
”Using the Pretest Checklist” on page 4-70.
Capacitance
The Capacitance Measurement test is used to measure EHV grading
capacitors. These capacitors are located in parallel with the main
contacts and can be measured through the EHV modules/cables when
the contacts are open. The test consists of measuring capacitance, in the
range of 75 to 10,000 pF, between each of the two EHV leads and the
common lead for each phase and each module. The test measurement
accuracy is in the range of
±
5%. Since the circuit breaker is not operated
during the test, no waveform is sent through the system
Slow Close
A combination of the OCB and Motion modules is used to monitor
performance during a Slow Close test. The purpose of the Slow Close test
is to accurately measure Contact Wipe. No external trigger is used. The
circuit breaker is usually operated manually by field personnel using a
hydraulic jack.
N
OTE
As there is no triggering mechanism, for recording to occur, the
software must be initiated from the Virtual Front Panel by field
personnel prior to operating the circuit breaker.
Содержание TDR9000
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