Tutorial: Mechanic - electrician Topic: Basics of electrical engineering the 2nd. Year The measuring system1 Prepared by: Ing. Jiří Smílek Projekt Anglicky.

Prezentace na téma: "Tutorial: Mechanic - electrician Topic: Basics of electrical engineering the 2nd. Year The measuring system1 Prepared by: Ing. Jiří Smílek Projekt Anglicky."— Transkript prezentace:

1

2 Tutorial: Mechanic - electrician Topic: Basics of electrical engineering the 2nd. Year The measuring system1 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.

3  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.

4  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.

5  Features: ◦ Measure the DC voltage and current, ◦ Little accuracy ◦ Sensitive to external magnetic field; ◦ Advantage :  Simplicity.  Application: ◦ The electrical equipment of motor vehicles

6  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.

7  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.

8  Properties: ◦ Measure the DC voltage and current, ◦ The scale is linear, ◦ Magnetic damping (eddy currents in an aluminum roller) ◦ High accuracy (0,1 and 0,2%), ◦ 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.

9 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 Electro-magnetic systems types of devices

10  Name the well-known measuring systems ◦  Describe the construction 1. system  Describe the principal function 1. system  Draw the type of measuring device 1. system  Name the application of the system 1. system

11  Describe the construction 2. system  Describe the principal function 2. system  Draw the type of measuring device 2. system  Name the application of the system 2. system

12  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