Evaluation electromagnetic contactor magnetic core temperature and dynamic strain using fiber Bragg gratings

[Display omitted] •The use of FBG allows to measure the temperature and strain in the magnetic core.•Contactor’s magnetic core strain can be associated with its operating condition.•The use of FBG strain sensors allows to determine faults during contactor operation.•The results can be used for monit...

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Bibliographic Details
Published in:	Measurement : journal of the International Measurement Confederation Vol. 166; p. 108174
Main Authors:	Tapia, Cesar Caytuiro, Ortiz, Jorge Luis Roel, Dreyer, Uilian José, Silva, Jean Carlos Cardozo da, Sousa, Kleiton de Morais
Format:	Journal Article
Language:	English
Published:	London Elsevier Ltd 15-12-2020 Elsevier Science Ltd
Subjects:	Air gaps Barriers Bragg gratings Dynamic strain Electromagnetic contactor Electromagnetic force Electromagnetic forces Electromagnetics Failure analysis Fast Fourier transformations Fiber Bragg grating Fourier transforms Magnetic cores Measurement Preventive maintenance Resonant frequencies Shading Strain Temperature Temperature measurement Thermal stability Voltage Voltage sags Electromagnetic contactor Temperature measurement Electromagnetic force Fiber Bragg grating Dynamic strain Failure analysis
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Summary:	[Display omitted] •The use of FBG allows to measure the temperature and strain in the magnetic core.•Contactor’s magnetic core strain can be associated with its operating condition.•The use of FBG strain sensors allows to determine faults during contactor operation.•The results can be used for monitoring of the contactor in industrial environments. This paper presents the results obtained from the fiber Bragg grating (FBG) sensors installed on the fixed magnetic core of an electromagnetic AC contactor for temperature and dynamic strain measurements. Using the results analysis, it is possible to apply the sensor system as a preventive maintenance tool, since the deformation experienced is proportional to the electromagnetic force in the contactor. The temperature variation is 76 °C and reaches thermal stability at t = 160 min on the contactor magnetic core. For the dynamic strain sensing four measurements were carried out with the contactor: intact, with voltage sag, with an air gap obstacle and without shading ring. The electromagnetic force has a fundamental frequency of 120 Hz, which is twice the frequency of the main supply power for the intact and with voltage sag contactor. This fundamental frequency is obtained by using a Fast Fourier Transform (FFT) technique of the steady-state dynamic strain measured wavelength. For the contactor with air gap obstacle and without a shading ring, the FBG wavelength variation is very noisy and the electromagnetic force is not sinusoidal.
ISSN:	0263-2241 1873-412X
DOI:	10.1016/j.measurement.2020.108174