
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
I-9
Monday
, November 26, 2001 1:09 pm
AN3: TR3190
™
Mechanical Interfaces and Other Transducers
Measuring the mechanical displacement and velocity of circuit breaker
mechanisms vs. time and contact operation is an important analytical
method.
Many utilities use simple, mechanical
Tom Edison Toys
which only
measure mechanical displacement vs. time as their primary breaker
timing tool. Many years of TR1 and TR2 experience have taught us much
about mechanical measurements using the MY transducer, including
how to successfully interface the transducer to breaker mechanisms.
Although it is straightforward, it is not quite so simple as it appears. High
acceleration requires interfaces and transducers with low mass, so as not
to affect the measurements. High shock loads at the limits of travel
require rugged interfaces so they don't fall apart, or impart false
movement due to their mechanical instability. High resolution and
accuracy are required; none of these characteristics are commercially
available, so the TR3190 was born.
”AN2: TR3190™ Digital, Linear/Rotary Motion Transducer” on page I-1
describes the design of the TR3190 Digital, Rotary/Linear Transducer in
detail and provides insight into the design of adapters/interfaces. It is
Doble's policy to develop both rotary and linear motion mechanical
interfaces for the TR3190.
Over the years the client users of TR1/TR2 have also developed interfaces
and documented many of them. The SFA interface has been developed
because the OEM slide wire adapters supplied by Westinghouse to
provide electrical measurements of motion are no longer available.
N
OTE
The T3 Input Expander was an auxiliary instrument designed to
interface between Westinghouse SFA slide wires and TR2/PR2, and to
interface to additional MV Transducers for measuring a total of three
mechanisms, simultaneously.
Photographs of the interface connected to an SFA breaker module, a
sketch of the interface form part of this design, will be provided on
request.
Other additions include the TR3170 Rotary Transducer and the TR3171
AHMA-4/8 Transducer. The TR3171 Transducer is used on any circuit
breaker that uses the AB AHMA-4/8 operator. This includes ABB Type PA
circuit breakers, certain ELF circuit breakers and PM circuit breakers
where the voltage class is 345 kV and above.
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