
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
D-3
Monday
, November 26, 2001 1:09 pm
Analog Channels
The analog channels are general purpose voltage recordings. The inputs
are isolated from each other and sampled by a 12-bit serial A/D
converter. The A/D converter clock is 80 kHz. Eight consecutive samples
are averaged and sampled by the system at 10 kHz.
Capacitance Channels
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.
Circuit Breaker Control
The system can be configured with a Trip/Close module capable of
activating the control coils of the circuit breaker under test. The
command signals are capable of switching 100 A of current on the Trip
channel and 20 A of current on the Close channel. These levels can be
sustained for tens of milliseconds, with lower current values sustainable
for tenths of seconds. Each channel is protected with a slow-blow fuse.
The Trip and Close command signals are programmed into timers,
configured via user inputs, when the operator initiates a test. Before a
Trip or Close command leaves the Instrument, each command signal is
interrupted by a relay that has three control mechanisms:
• When the test is initiated, the firmware outputs a logic enable
signal to the relay control circuitry.
• Once the safety switch is pressed, voltage is supplied to one side
of the relay coil.
• The firmware detects the safety switch closure and outputs a
signal, which completes the relay coil circuit allowing the
command signals out to the breaker.
Содержание TDR9000
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