System monitors power generation
A
Sensonics product story
Edited by the Engineeringtalk editorial team
Jul 30, 2007
Sensonics' MO8612 Mark-Space option calculates differential expansion from range settings determined during final commissioning.
One of the challenges facing instrumentation engineers in the power generation sector is the accurate measurement of shaft growth relative to casing on large steam turbine rotor sections.
Commonly referred to as differential expansion, this measurement technique is essential at various stages of the turbine.
Obtaining the required linear range over the full operating conditions of the turbine is difficult and common proximity probe techniques using a gap measurement against a shaft collar are sensitive to nonaxial turbine movement and limited by probe target size.
Didcot A Power Station, since the mid 1980s, has been successfully using a differential expansion technique incorporating a time-based measurement method based on a series of plates fitted around the shaft at the appropriate rotor section.
However in recent years, maintenance of the original signal processing equipment had become more difficult and condition monitoring specialists Sensonics were commissioned to update the system.
The MO8612 Mark-Space option, from the 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 training course for the station engineers on a simulation rig as part of the system hand over.
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