By Stephen J. Chapman
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Extra info for Electric Machinery Fundamentals (Power & Energy)
Hence the most suitable approach is to actually average the flux level as Hence Faraday’s law may be rewritten as: eind = N dφ dt φ = λ N The voltage ratio across a Transformer f the voltage source is vp(t), how will the transformer react to this applied voltage? Based upon Faraday’s Law, looking at the primary side of the transformer, we can determine the average flux level based upon the number of turns; where, φ = 1 v P (t ) dt NP ∫ 6 EEEB344 Electromechanical Devices Chapter 2 This relation means that the average flux at the primary winding is proportional to the voltage level at the primary side divided by the number of turns at the primary winding.
The more slots there are and the more closely spaced the slots are, the better this approximation becomes. In practice, it is not possible to distribute windings exactly as in the nC equation above, since there are only a finite number of slots in a real machine and since only integral numbers of conductors can be included in each slot. 4. Induced Voltage in AC Machines The induced voltage in a Coil on a Two-Pole Stator Previously, discussions were made related to induced 3 phase currents producing a rotating magnetic field.
In a single phase system, the relationship are: Pbase, Qbase or Sbase = Vbase Ibase And Zbase = Vbase I base Zbase = (Vbase )2 Ybase = I base Vbase Sbase All other values can be computed once the base values of S (or P) and V have been selected. In a power system, a base apparent power and voltage are selected at a specified point in the system. A transformer has no effect on the base apparent power of the system, since the apparent power equals the apparent power out. Voltage changes as it goes through a transformer, so Vbase changes at every transformer in the system according to its turns ratio.