Phase Converter Efficiency Three-phase motors are often used in equipment because they are more efficient and reliable

Question:

Phase Converter Efficiency Three-phase motors are often used in equipment because they are more efficient and reliable than single-phase motors.

Such equipment may be installed in locations where only single-phase power is available and the cost of installing three-phase service is prohibitive. The rotary phase converter in Figure P16–71 is one way of providing three-phase power from a single-phase source. Simply stated, the converter is a rotating transformer that shifts the phase of a portion of the single-phase input to produce a balanced set of three-phase voltages. In a certain application a converter supplies threephase power to a 30-hp motor (1 hp ¼ 746 W) that is 85%

efficiency at full load. At full load the single-phase inputs are 220V(rms) and 130A(rms) at a power factor of 0.95 lagging.

Find the efficiency of the converter. image text in transcribed