Development of a magnetic field sensor for acquisition of lightning fields within facilities (CROSBI ID 410281)
Ocjenski rad | diplomski rad
Podaci o odgovornosti
Krolo, Ivan
Vujević, Slavko
engleski
Development of a magnetic field sensor for acquisition of lightning fields within facilities
The purpose of this work was developing of a special magnetic sensor which can measure magnetic fields generated by lightning impulse currents. High facilities have a high risk of being hit by lightning, and thus, they are threatened by induced magnetic field. Example of such facility is wind turbine nacelle. Time- varying magnetic fields, generated by lightning currents, induce high voltages in close metallic structures of facilities. These voltages can harm sensitive elements, such as electronic circuits and control systems. The first step in preparing of protection measures is measurement and estimation of magnetic field within such structures in case of lightning strike. Estimation of magnetic field is done by numerical calculation with FEM software COMSOL Multiphysics. With certain assumptions and different approaches, the maximum estimated value of the magnetic field inside of a wind turbine nacelle was around 50 kA/m. With frequency, specified by IEC standard, the required parameters for magnetic sensor were defined. With known parameters of the magnetic field, proper magnetic sensor can be chosen or developed. Different magnetic sensor types were investigated, and the inductive sensor meets best the requirements. Advantage of inductive sensors is their simplicity of manufacturing, low cost and their measuring field range. This type of sensor shows a linear characteristic. The needed integrator for obtaining magnetic field strength and shape requires a corresponding measuring circuit. This circuit can be affected by magnetic fields induced in wind turbines, and the problem can be solved with proper EMC protection of that circuit. Various simple inductive loop sensors were built and tested. The different abilities of the inductive sensors were discussed, and some fine conclusions were obtained. The sensors shown great measuring accuracy. It was proved that they can measure the magnetic field regardless on the direction or amplitude, so it makes them perfect for measuring of the transient magnetic field within any construction struck by lightning.
lightning ; magnetic sensor ; wind turbine ; finite element method
Diplomski rad je izrađen i obranjen na Tehničkom sveučilištu Ilmenau, Ilmenau, Njemačka u sklopu Erasmus razmjene studenata
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Podaci o izdanju
73
08.09.2015.
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Podaci o ustanovi koja je dodijelila akademski stupanj
Fakultet elektrotehnike, strojarstva i brodogradnje u Splitu
Split