One system is comprised of a three phase heater (pure resistive). This heater is delta connected and
Question:
One system is comprised of a three phase heater (pure resistive). This heater is delta connected and has a power of 50,000W, at 60-Hz; a synchronous motor with a cylindrical rotor. This motor has fourth poles and is connected in a star, with a power of 30 hp at 60 Hz, this motor will be operating at 50% of its rated load and a torque angle of -16.4%, with an efficiency of 96% and synchronous reactance of 0.667 ohm / phase; This system also has an induction motor, 3, star (Y), works at 60-Hz and has 6 poles. This motor will be running at 75% of its rated load, but at an efficiency of 95.8% with a PF of 89.1%. For the entire system the voltage will be 460-V. Find:
a)the total real power of the system,
b)the synchronous motor power factor,
c)the powers, reactive and apparent as the system power factor,
d) draw the power diagram.
College Physics Reasoning and Relationships
ISBN: 978-0840058195
2nd edition
Authors: Nicholas Giordano