Equivalent load test for induction machines-the forward short circuit test

Often full load testing of induction machines with outputs greater than 1 MW present difficulties when attempting to verify the rated performance, especially the temperature rise. This is because of limitations imposed by the manufacturer´s power supplies and load equipment. The forward short circuit test, as an equivalent load test, is an alternate loading method which most manufacturers and service facilities could employ with a minimum capital expenditure. The theory of the method is described and temperature rise test results from a 1960 kW 4 pole machine are compared with test results obtained using several other test methods