第2个回答 2013-11-19
In principle, a starter shall be provided for all electric motor 0.5bhp and above. Motors up to22kW rating shall be started by means of a “DIRECT ON LINE” type starter. Motorsbetween 22kW and 75kW shall be started by means of a “STAR-DELTA” type starter.Motors above 75kW shall be started by means of an “AUTO-TRANSFORMER” type starteror “SOFT” starter.