Investigation of induction generator wide band vibration monitoring using fibre Bragg grating accelerometers

Abstract

This paper investigates the use of fibre Bragg grating (FBG) accelerometers for wide band vibration monitoring in wound rotor induction generators. The sensor performance is assessed in a series of experiments on a laboratory test rig comprising a 30kW induction machine operating in healthy conditions and with electrical or mechanical fault. Vibration measurements are processed and analyzed in the frequency domain for fault feature extraction. The fibre optic sensor effectiveness in measurement of wide band fault signatures in the vibration signal is compared with that of a commercial piezoelectric based solution. The potential and limitations of the investigated FBG accelerometer design are evaluated for use in condition monitoring applications.

Generator Insulation-Aging On-Line Monitoring Technique Based on Fiber Optic Detecting Technology

“…Vibration sparking is a special process in gas-fired generators combining insulation thermal aging together with strong vibration effects [20][21][22]. Hot-spot measurement was performed in a random wound electric machine coil [23].…”

Investigation of the Effect of Bonding Points on Metal Surface-Mounted FBG Sensors for Electric Machines

“…Fibre Bragg gratings (FBG) are one form of sensors commonly used in FOS because of their simple but effective multi-signature sensing capability when multiplexed on a single fibre. FBGs are apposite for distributed sensing and redundant measurements thus, increasing sensor reliability and robustness with insignificant additional cost.FBG sensors used in electric machines are bonded to a metallic surface (either around the cast frame or on the stator windings; [4][5][6][7][8][9][10][11]) using an adhesive. One rare exception is the use of rotary joints with FBGs [12] which is an uncommon application.…”

Fiber Segment Interferometry for Dynamic Strain Measurements

“…As currently constructed, the interferometric approach proposed in this paper can only measure relative strain changes from an a priori unknown starting point, and is thus only suited for purely dynamic strain sensing applications, while further developments could also allow absolute strain/temperature sensing in the future. Dynamic strain measurement applications feasible with the current implementation include vibration-based condition monitoring [8], [9], cyclic load estimation [10], rotor imbalance detection [11] and the monitoring of transient strain events, such as quench detection in superconducting magnets [12] or impact detection [13], [14]. Also applications in fiber-optic ultrasound detection using integrating long-gauge length sensors [15], [16] could be envisaged.…”