A 440-V, 3-phase, 8-pole, 50-Hz star-connected induction motor is given The equivalent circuit of RI =0.1ohm, R'2 = 0.1/s ohm; xl = x'2 j0.5 ohm, Re=100 ohm, xm=j20 ohm. The short-circuit test is conducted with a locked rotor and a line current of 80 A. The 'open-circuit' test is conducted by supplying the primary winding at rated voltage and at the same time driving the rotor in the same direction as the rotating field, at synchronous speed; s = 0. Determine: (a the line voltage and power factor on the short-circuit test; (bi the line current and power factor on the 'open-circuit' test; (e; the equivalent circuit per-phase if these tests were analyzed on an approximate basis; i.e. neglecting the magnetizing branch when analyzing the s.c. test and neglecting the series leakage impedances for analysis of the o.c. test.
A 440-V, 3-phase, 8-pole, 50-Hz star-connected induction motor is given The equivalent circuit of RI =0.1ohm, R'2 = 0.1/s ohm; xl = x'2 j0.5 ohm, Re=100 ohm, xm=j20 ohm. The short-circuit test is conducted with a locked rotor and a line current of 80 A. The 'open-circuit' test is conducted by supplying the primary winding at rated voltage and at the same time driving the rotor in the same direction as the rotating field, at synchronous speed; s = 0. Determine: (a the line voltage and power factor on the short-circuit test; (bi the line current and power factor on the 'open-circuit' test; (e; the equivalent circuit per-phase if these tests were analyzed on an approximate basis; i.e. neglecting the magnetizing branch when analyzing the s.c. test and neglecting the series leakage impedances for analysis of the o.c. test.
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Transcribed Image Text:A 440-V, 3-phase, 8-pole, 50-Hz star-connected induction motor is given The
equivalent circuit of RI =0.1ohm, R'2 = 0.1/s ohm; xl =x'2 = j0.5 ohm,
Rc=100 ohm, xm=j20 ohm. The short-circuit test is conducted with a locked
rotor and a line current of 80 A. The 'open-circuit' test is conducted by
supplying the primary winding at rated voltage and at the same time
driving the rotor in the same direction as the rotating field, at
synchronous speed; s = 0. Determine:
(a the line voltage and power factor on the short-circuit test;
(bi the line current and power factor on the 'open-circuit' test;
(e; the equivalent circuit per-phase if these tests were analyzed on an
approximate basis; i.e. neglecting the magnetizing branch when analyzing
the s.c. test and neglecting the series leakage impedances for analysis of the
o.c. test.
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