Abstract
We report the results of calibration of an optical-fibre (OF) probe designed for interferometric measurement of vibrations inside high-power transformers. The sensor is highly sensitive in this harsh environment of electromagnetic fields, wide temperature range and oil immersion. A comparative analysis with commercial piezoelectric accelerometers is also presented, focusing on two experiments: the common calibration with a free-space Michelson interferometer that has a controlled moving arm and calibration by obtaining the transference function of magnetostriction in the magnetic laminates by dynamic means. Both methods confirm the extremely high performance of the OF interferometric sensor and the limitations of accelerometers with characteristic low-amplitude vibrations (submicron) and a large range of measurement, as well as for a typical low frequency (100 Hz) but wide bandwidth for the harmonics. The OF probe detects the dynamic strain of deformed elements and the displacement between them. Proper design of the sensor improves its sensitivity through magnification, reaching a resolution of better than 1 nm. Finally, we demonstrate on-site measurements inside two power transformers.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
