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A 440-V, 3-phase, 8-pole, 50-Hz star-connected induction motor is given. The equivalent circuit of RI -0.1ohm, R2-0.1/s ohm; x1 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. Detemine: (a) the line voltage and power factor on the short-circuit test; (b) the line current and power factor on the 'open-circuit test; (c) 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, R2-0.1/s ohm; x1 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. Detemine: (a) the line voltage and power factor on the short-circuit test; (b) the line current and power factor on the 'open-circuit test; (c) 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

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 440-V, 3-phase, 8-pole, 50-Hz star-connected induction motor is given. The equivalent circuit of RI -0.lohm, R2-0.1/s ohm; x1 x'2-jo.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; (b) the line current and power factor on the 'open-circuit' test; (c) 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
Transcribed Image Text:A 440-V, 3-phase, 8-pole, 50-Hz star-connected induction motor is given. The equivalent circuit of RI -0.lohm, R2-0.1/s ohm; x1 x'2-jo.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; (b) the line current and power factor on the 'open-circuit' test; (c) 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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