
Universal Adapter
I-26
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
The velocity trace displayed on the graphic output is the printout of the
Average Velocity calculated as follows:
The position of the transducer rod at each 100
µ
sec interval from the
test initiation is recorded. From this data and the 100
µ
sec time
period, the individual Average Velocities are calculated. These
Average Velocity points are then printed in the graphical output. The
scale for the velocity is printed at the end of the graph.
The velocity that is tabulated is the highest Average Velocity calculated
over the 100
µ
sec intervals.
All velocity measurements are directly proportional to either linear or
rotary movement of the circuit breaker. If the circuit breaker contact
travel is not equal to the transducer rod travel, the Transfer Function
provides the correction factor necessary for these measurements. These
two values are entered by the user from data provided by the circuit
breaker manufacturer and or the user; the default ratio is 1.00 to 1.00.
Displacement values near the beginning or end of travel should be
avoided.
During a Trip test the circuit breaker remains closed for several
milliseconds after the Trip signal is applied. If zero displacement is
selected as the beginning of the zone, the TDR9000 starts timing at test
inception and the several milliseconds that the breaker remains fully
closed prior to circuit breaker movement are included in the time used
for the calculation of Average Velocity for the specified zone.
For Close tests, zero is also the fully closed position of the circuit breaker.
If zero is chosen as the end point and the circuit breaker mechanism
continues to move for the majority of the Close test, due to the dampener,
the time used for the Average Velocity will again be excessively long.
Содержание TDR9000
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