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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Mechanic - electrician Topic : Basics of electrical engineering the 2nd. Year The m easuring system 1 Prepared by: Ing. Jiří Smílek.

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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Mechanic - electrician Topic: Basicsofelectricalengineering the 2nd. Year Themeasuringsystem1 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.

  2. The measuring system • System with a rotating magnet • Construction: • In the hollow coil is a pivotally positioned magnet. • Attached to the shaft are a needle and spring, which are used for power supply and also holds a pointer to zero .

  3. System with a rotating magnet • Principal function: • An electric current passes through the stationary coil creating an electric current. • A permanent magnet makes it so that it’s induction curve undergoes the same sense as the induction curve of magnetic field coils.

  4. Electro-magnetic system • Features: • Measure the DC voltage and current, • Little accuracy • Sensitive to external magnetic field; • Advantage: • Simplicity. • Application: • The electrical equipment of motor vehicles

  5. Measuring system • Electro-magnetic system – with a rotating coil • Construction: • In the cavity between the magnetic pole attachments is a magnetic coil pivotally placed in an aluminum frame. • Attached to the shaft are a needle and spring, which are used for power supply and also holds a pointer to zero.

  6. Electro-magnetic system • Principal function: • Passing a current through the coil creates a magnetic field, which tries to turn the coil so that the direction of the magnetic flux coincides with the direction of the magnetic flux of the permanent magnet.

  7. Electro-magnetic system • Properties: • Measure the DC voltage and current, • The scale is linear, • Magnetic damping (eddy currents in an aluminum roller) • High accuracy (0,1 and0,2%), • Low self consumption (8 - 3 W), • Sensitivity of the gross mechanical and electrical usage, • Strong influence of temperature • Application: • DC voltmeters and ammeters and indirectly for the measurement of other variables.

  8. Electro-magnetic systems types of devices • Electro-magnetic device – with a rotating coil • measurement of DC voltage and current • Electro-magnetic ratiometric device • measurement of resistance • Electro-magnetic device with a built in insulated thermocouple • measurement of non-sinusoidal currents • Electro-magnetic device with an integrated regulator • measurement of sinusoidal alternating currents

  9. Activity for students - questions • Name the well-known measuring systems • Describe the construction 1. system • Describe the principal function1. system • Draw the type of measuring device 1. system • Name the application of the system1. system

  10. Activities for students - questions • Describe the construction 2. system • Describe the principal function 2. system • Draw the type of measuring device 2. system • Name the application of the system2. system

  11. Bibliography • 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-konkurenceschopnost • Electrical Measurement textbooks– Ing. Pavel Vylegala, SŠE Ostrava, 2006 • Electrical Measurement textbooks– SNTL, 1981

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