Differential expansion measurement
September 1st 2007 Didcot A Power Station has been
successfully using a differential
expansion
technique
incorporating a
time measurement
method based on
a series of plates
fitted around the
shaft at the
appropriate rotor
section.
Maintenance of the
original signal
processing
equipment had
become
increasingly
difficult so
condition
monitoring
specialist
Sensonics was
commissioned to
update the system.
The MO8612 Mark-
Space option, from
its Sentry Turbine Supervisory
Equipment Series, was fitted on the
HP, IP, and LP3 rotor sections of the
steam turbine.
Software
configurable to
the shaft plate
pattern, the
module
processes the
pulses generated
by a standard
proximity probe
fitted against the
shaft, calculating
the differential
expansion from
range settings
determined
during final
commissioning.
Sensonics
provided a
course for the
station engineers
on a simulation
rig as part of the
system handover. More articles from Sensonics Ltd: | 
