
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
I-3
Monday
, November 26, 2001 1:09 pm
front surface of the transducer. The degree of freedom can be
ascertained by placing the rod in the transducer, closing the latch,
and then moving the rod back and forth. Observe the motion of the
pressure rollers. By using this feature, it is possible to attach the
transducer to a point which moves in more than one plane as the
breaker operates. In many breaker mechanisms, there are bell cranks
which transmit the motion of the prime mover to the contacts. Using
a suitable flexible coupling for attaching the connecting rod to a bell
crank provides a good representation of contact motion.
Once the attachment point for the connecting rod has been
determined, the next step is to provide a suitable mount for the
transducer. This mount should be rigid and hold the transducer
perpendicular to the line of motion of the connecting rod. In many oil
breakers, the cap which covers the access hole is a pipe cap,
approximately 2" in diameter. Determine the pipe size of the cap.
Obtain a pipe coupling, short pipe nipple, and a floor flange to
assemble a simple but reliable/rugged circuit breaker mounting
adapter. The pipe coupling -short nipple -floor flange assembly is
screwed on in place of the cap. After this adapter is screwed on to the
breaker, the connecting rod is then installed, and the transducer is
clamped to the floor flange with C-clamps. If this approach is not
possible, other fasteners on the breaker can be used, or suitable
fixtures can be fabricated which clamp to the structure of the breaker.
Remember that the data generated by the transducer is distorted by
any motion of the mounting setup during circuit breaker operation.
There are several features of the transducer which are used to alleviate
difficult mounting problems. The base plate of the transducer is detached
by removing the four flat head screws visible on the bottom of the device.
Other mounting plates can be fabricated to meet special needs, or the
transducer can be used without the mounting plate. There are threaded
holes on the bottom and front surface of the transducer which are used to
secure the transducer to special mounting fixtures. When using this
method take care to ensure the screws that are used are of correct length;
screws that are longer than necessary may damage the internal
mechanism of the transducer. The transducer can be mounted with either
its top or bottom facing the breaker. Avoid applying clamping forces to
the housing of the transducer, as it is possible to distort the housing and
cause loss of accuracy.
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