ELE -508 LAB 2 Synchronous Capacitor Preamble: All Synchronous Machines Because they are capable of power factor correction are rated in terms of Reactive power KVA , MV A When a synchronous motor is not used to drive a mechanical load but is used to provide a le adding PF It is Called a Synchronous capacitor. Equipment: 1) Synchronous motor 2) Three phase digital Power meter Experiment: 1) Hookup the synchronous motor to the labvolt power supply as per your schematic developed in the lab 1. 2) Start the synchronous motor as a squirrel cage motor, switch field on at 95% synchronous speed to synchronize the motor with the power supply frequency. 3) Tabulate and plot KVA, KVAR, I phase versus IF for 10 steps of IF From min to max. Note: the motor is run as Synchronous capacitor Comments: 1) What value of field current yields a minimum line current Line current ? 2) What is the PF at the minimum Line current ? Field Current KVA KVAR Phase Current POWER PF Calculated PF 3) Use Formula Power = KVA * cos () To derive PF and compare this to measured value. If the PF is different to the measured value explain why? 4) Why would you want to use the synchronous motor to PF correct, instead of power factor capacitors? 5) What is the largest KVA the Synchronous motor has delivered or absorbed in your experiment? ___--------------- KVA Is this within rated value of the motor ? What is the rated value of the Synchronous motor KVA ?