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Tutorial: Mechanic - electrician Topic: Basics of electrical engineering the 2nd. year Measuring system 2 Prepared by: Ing. Jiří Smílek Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
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Electromagnetic system – rotary iron Construction: Inside the coils are placed two blades fixed moving The moving blade is attached to a handle
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Principal function: Mutual stresses exerted of two ferromagnetic materials in a magnetic field When the current passes through the coil it creates a magnetic field that repels the blades from each other Application: ◦ Measures DC and AC currents and voltages
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Properties: Simplicity Operationally safe construction Large short-term overload Measures DC and AC Easily extend the range with an inverter - MTP/MTN Mark:
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Electrodynamic system Construction: Inside the solid core coil is positioned a moving coil The moving coil is attached to a handle The fixed coil is divided into two parts – a larger homogenous field
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Principal function: Mutual electrodynamic stresses of the currents of both coils The magnetic field coil creates motion torque M p = k I 1 I 2 Application: ◦ Measuring current and voltage – DC and AC ◦ Performance measurement
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Properties: Small sensitivity Large consumption The influence of foreign fields – magnetic shielding Mark:
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Ferrodynamic system Construction: Eletrodynamic system with a ferromagnetic core coil of sheet metal of silicon and steel.
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Principal function: ◦ Same as electrodynamic system ◦ Ferromagnetic core increases sensitivity Application: ◦ Measurement of AC power
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Properties: Greater sensitivity Less consumption Measures power output <1W Mark:
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Name the well-known measuring systems ◦ Describe the construction 1. system Describe the principal function 1. system Draw the mark on the measuring device 1. system Name the applications of the system 1. system
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Describe the construction 2. system Describe the principal function 2. system Draw the mark on the measuring device 2. system Name the applications of the system 2. system Compare systems 2 and 3
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Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, 2000. ISBN 80-7361-269-7. Operační program Vzdělávání pro konkurenceschopnost, ESF 2007 – 2013. Available at: http://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro- konkurenceschopnosthttp://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro- konkurenceschopnost Electrical Measurement textbooks– Ing. Pavel Vylegala SŠE Ostrava, 2006 Electrical Measurement textbooks – SNTL, 1981
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