This paper describes a unique and comprehensive fibre optic sensor technology to provide accurate control and diagnostics for subsea and down-hole pump and motor combinations. Existing comparable technology is restricted to monitoring the variable frequency power supply at the platform, or very low bandwidth applications for ESP's down-hole with limited analysis capabilities. In this system, the performance and condition (particularly if it is approaching failure mode) of an electric motor is monitored by the temperature of bearings and windings, and by spectral analysis of the mechanical vibration signature and the motor driving current. There are major cost advantages in control for optimizing performance, increasing life expectancy, and diagnostics for scheduled maintenance in place of catastrophic failure and replacement philosophy. The sensor system is likely to be a relatively low cost item which could also be embedded into motor units during manufacture, but able to provide comprehensive real-time data from remote installations. A technique for metering grid currents using in-fibre Bragg gratings piezoelectrically-driven by a conventional current transformer is demonstrated. We find a resolution of 0.7A/root Hz for frequencies up to 10 kHz.
Fibre optic based sensor network for condition monitoring of subsea production machinery
1998
9 Seiten, 26 Quellen
Aufsatz (Konferenz)
Englisch
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