Tutorial:Mechanic - electrician Topic: Electric measurement the 2nd. year Power output- AC 3-phase Prepared by: Ing. Jiří Smílek Projekt Anglicky v odborných.

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2 Tutorial:Mechanic - electrician Topic: Electric measurement the 2nd. year Power output- AC 3-phase 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  3f power output current is the sum of the outputs at different stages ◦ P 3f = P 1 + P 2 + P 3 ◦ Under symmetrical load:  P 3f = 3 x P 1f  P 1f = U f x I f x cos  P 3f = 3 x U f x I f x cos  Reactive power  Q 3f = 3 x U f x I f x sin  Apparent power  S 3f = 3 x U f x I f

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5  Types of networks: ◦ Three-wire – e.g. engine power, high and very high voltage ◦ Four-wire – a common distribution network

6  Measurement of power output: ◦ Three-wire – ◦ One wattmeter ◦ Four-wire –

7  Measurement of power output: ◦ Three-wire ◦ Three wattmeters ◦ Four-wire

8  Measurement of power outputs: ◦ Two wattmeters - Aron insertion ◦ Symmetrical and non-symmetrical loads ◦ P = P 1 + P 2 = k (α 1 + α 2 )  k – constant W-meter  α 1 – variable 1. W-meter  α 2 - variable 2. W-meter

9  Name the types of networks under load: a) b)  Name the types of networks according to the number of conductors: a) b)  Describe how many W-meters it is possible to measure power output and where and how: a) b) c)

10  Name the types of three-phase power ◦ power output  How do you calculate the three-phase power system? ◦ P 3f =  How do you find the three-phase power of the Aron insertion? ◦ P 3f =

11  Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, 2000. ISBN 80-7361-269-7.  Wikipedie  Příručka elektrotechnika, Europa 2000  Elektrické měření - E. Viteček, Vl.HOS - SNTL 1978  Elektřina kolem nás – Zdeněk Opava – Albatros 1981  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