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/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
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
Types of networks: ◦ Three-wire – e.g. engine power, high and very high voltage ◦ Four-wire – a common distribution network
Measurement of power output: ◦ Three-wire – ◦ One wattmeter ◦ Four-wire –
Measurement of power output: ◦ Three-wire ◦ Three wattmeters ◦ Four-wire
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
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)
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 =
Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, ISBN 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 – Available at: konkurenceschopnosthttp:// konkurenceschopnost