Download Analysis of Electrical Machines by Richard T. Smith (Auth.) PDF

By Richard T. Smith (Auth.)

ISBN-10: 008027174X

ISBN-13: 9780080271743

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V)t + 0] (8) We see that each term of this expression is of the same frequency, even that term due to the combined effects of i and i . To examine the possibility of expression (8) equaling zero, let us replace each term by its phasor equivalent. Using I = If/, we find indeed a h f RI + y(co - v)L I f ff f + ( c o - v)Ml 7 a =0 (9) or, so that (10) and /(j>— ^ — 7T/2+ S —tan 33 Introduction or, tan[8-<#>-77/2] = (H) Therefore, (10) shows that the amplitude of I must be related to the stator phase current I and must be produced by the induced voltage due to the stator currents.

Find the current / (a) when switch a is open; (b) when switch a is closed. The 10 ohms is entirely reactive. N —100, x 2 3 4 } # 2 =300,^3=200,^4=50. 11. For the device shown, consisting of two single phase transformers, interconnected as illustrated, find the voltage across each winding and current through each. The leakages are negligible and the magnetizing impedances referred to N are: x transformer Z ohms turns ratio N /N A B J100 J50 2 1 m x 2 51 Introduction (Both transformers wound the same way.

Three identical single-phase transformers are connected to form a wye-delta three-phase bank. Accidentally, the polarity of one of the 52 Analysis of Electrical Machines secondary windings is reversed. Balanced three-phase voltages are applied to the wye side. Derive literal expressions for: (a) The voltage across the terminals of the delta if it is opened at one corner. (b) The current that will flow in the closed delta. (c) the current that will flow in the closed delta if a resistance R is inserted in series with it.

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Analysis of Electrical Machines by Richard T. Smith (Auth.)


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