doble TDR9000, User Manual, Page: 430 / 454

Universal Adapter
I-20 72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Universal Adapter
Measurement of circuit breaker motion can be done by transferring one
physical value to another suitable for us by an electronic instrument. This
universal adapter for the transducer transfers the rotary or linear motion
of circuit breaker part in motion into digital impulses.
To connect the adapter to the moving part of circuit breaker:
N
OTE
For some circuit breakers it is very difficult to find a place with the same
motion characteristics as main contact in motion. This is particularly
true for Live Tank Circuit Breakers.
One of possible positions is rotating shaft of the operating mechanism
or the shaft at the phase housing. Using the rotary motion at the shaft
and the linear motion at circuit breaker main contact, a transition
formula can be included in the Breaker Test Plan.
1. Attach the adapter with a C clamp to the fixed circuit breaker or the
mechanism part close to the moving shaft.
2. Adjust the moving bars so they can be moved.
3. Connect a threaded shaft ¼-24 to the rotating circuit breaker shaft.
N
OTE
If there is no threaded hole in the shaft – drill and tap a ¼-24 hole. If
there is threaded hole with different thread, make an adapter that
accepts the threaded bar.
4. Tighten with a jam nut, as shown in Figure I.19.
Figure I.19 Flexible Coupler/Jam Nut
Jam Nut
Flexible
Coupler