
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
I-25
Monday
, November 26, 2001 1:09 pm
AN6: Velocity Measurements
There are four types of velocity measurements made by the TDR9000
during Trip and Close operations. These measurements are tabulated in
the Breaker Performance Report and displayed on the graphic trace of
circuit breaker operation.
The Average Velocity for Zone I and Zone 2 during a Close or Open is
calculated as follows:
There are five ways to specify the method for determining the zone in
which the average velocity is to be calculated:
• Distance – Distance
• Distance – Time
• Time – Time
• Main Contact Operation – Time (Time before Contact Close and
Main Contact Close or Main Contact Open and time after Main
Contact Open)
• Main Contact Operation – Distance (Distance before Contact
Close and Main Contact Close or Main Contact Open and a
Distance after Main Contact part)
For each zone in which a travel velocity is desired, the beginning and
ending points of the zone are specified. The reference for all distance
measurements is the fully closed position of the circuit breaker, and the
displacement value for the fully closed position is zero. When the
transducer rod passes the selected beginning point the time is recorded.
All subsequent movement of the transducer rod is summed until the
transducer reaches the selected end point whose time is also recorded.
The sum of these incremental travel distances is the distance the circuit
breaker travels and the difference between the two times is the time it
took to travel the distance. The distance traveled divided by the time
required yields the Average Velocity for the respective zone. This value is
printed in the tabulation under Mechanical Motion.
The value for the velocity that is tabulated under OCB or EHV Contact
Timing is calculated as follows:
The time and the position of the transducer rod when the contact
first makes or breaks is tagged. The position of the transducer rod
500
µ
sec before contact operation and the position of the transducer
rod 400
µ
sec after contact operation is also tagged. The turn of the
incremental movements of the transducer rod divided by the time
(1000
µ
sec) yields the Average Velocity at first contact make or break.
Содержание TDR9000
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