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(b) A three-phase, 30 kW, 50 Hz, 380 V, SCIM motor draws a line current of 60 amperes when it is full-loaded. DC test, open-circuit test and short-circuit test carried out at the motor stator side give the following results: DC test Open-circuit test Short-circuit test Line Current 6 A 10 A 60 A Line Voltage Wattmeter reading 2 V 380 V 50 V 900 W 3000 W -- Assume that AC and DC resistances of the motor are the same. Estimate: (i) The per-phase equivalent stator and rotor resistances of the motor; (ii) The motor efficiency at the full load condition; and (iii) The motor maximum efficiency and the loading level at which the maximum efficiency occurs.

(b) A three-phase, 30 kW, 50 Hz, 380 V, SCIM motor draws a line current of 60 amperes when it is full-loaded. DC test, open-circuit test and short-circuit test carried out at the motor stator side give the following results: DC test Open-circuit test Short-circuit test Line Current 6 A 10 A 60 A Line Voltage Wattmeter reading 2 V 380 V 50 V 900 W 3000 W -- Assume that AC and DC resistances of the motor are the same. Estimate: (i) The per-phase equivalent stator and rotor resistances of the motor; (ii) The motor efficiency at the full load condition; and (iii) The motor maximum efficiency and the loading level at which the maximum efficiency occurs.

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
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(b) A three-phase, 30 kW, 50 Hz, 380 V, SCIM motor draws a line current of 60 amperes when it is full-loaded. DC test, open-circuit test and short-circuit test carried out at the motor stator side give the following results: DC test Open-circuit test 10 A Short-circuit test Line Current Line Voltage Wattmeter reading 6 A 380 V 900 W 60 A 50 V 3000 W 2 V -- Assume that AC and DC resistances of the motor are the same. Estimate: (i) The per-phase equivalent stator and rotor resistances of the motor; (ii) The motor efficiency at the full load condition; and (iii) The motor maximum efficiency and the loading level at which the maximum efficiency occurs.
Transcribed Image Text:(b) A three-phase, 30 kW, 50 Hz, 380 V, SCIM motor draws a line current of 60 amperes when it is full-loaded. DC test, open-circuit test and short-circuit test carried out at the motor stator side give the following results: DC test Open-circuit test 10 A Short-circuit test Line Current Line Voltage Wattmeter reading 6 A 380 V 900 W 60 A 50 V 3000 W 2 V -- Assume that AC and DC resistances of the motor are the same. Estimate: (i) The per-phase equivalent stator and rotor resistances of the motor; (ii) The motor efficiency at the full load condition; and (iii) The motor maximum efficiency and the loading level at which the maximum efficiency occurs.
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