AS/NZS 1359.102.3:2000

Specifies internationally aligned test methods for determining losses and efficiency of three-phase cage induction motors. This Standard prescribes two test methods, Method 1, involving torque measurements applicable to motors of all kW ratings and Method 2, without torque measurements, applicable to motors of up to 200 kW rating.

This Standard specifies two indirect methods for determining losses and efficiency of three-phasecage induction motors by the summation of losses:(a) Method 1, for motors of any rating with additional load losses determined from torquemeasurements under various load conditions.NOTE: For motors rated over 200 kW, refer to Clause 5.3.(b) Method 2, for motors in the output range 1 kW to 200 kW, without torque measurements,and with additional load losses assigned herein.NOTE: When using Method 2 with assigned additional load losses it has to be understood that the curve in Table 1 does not represent an average but an upper envelope of a large number ofmeasured values, and will in most cases yield lower values of efficiency than Method 1.The methods above give similar results for motors generally, but Method 1 is intended to beused where efficiency is required to be known with a greater accuracy.

First published as AS/NZS 1359.102.3:2000.