PE Electrical case studies
PE Electrical · Put your knowledge to work in context.
The PE Electrical and Computer: Power credential is a professional engineering license for engineers who design, analyze, and maintain electric power systems - generation, transmission, distribution, and industrial or commercial power utilization. It is administered by NCEES and is one of three disciplines offered within the PE Electrical and Computer exam, alongside Computer Engineering and Electronics, Controls, and Communications. The PE Electrical case studies are 5 cases and about 4,338 words.
1Capacitor Bank Sizing and Harmonic Resonance at a 480 V Plant
A 480 V, three-phase, 60 Hz plant is served by a 1000 kVA transformer with 5.75% impedance. The load is 600 kVA at 0.72 power factor lagging, made up mostly of across-the-line induction motors plus two six-pulse VFDs on the largest pumps.
757 words, about 4 min224 VDC Solenoid Control Cable Voltage Drop
A skid-mounted package has a 24 VDC power supply with ±10% output tolerance feeding four solenoid valves through one 2-wire control cable, 250 ft from the panel to the junction box. Each solenoid draws 0.5 A at 24 V and the four coils are paralleled at the far end, so the cable carries 2.0 A.
869 words, about 4 min3Across-the-Line Motor Start on an Islanded Diesel Generator
A 480 V, 60 Hz, 1500 kVA standby diesel generator (0.8 pf, subtransient reactance X″d = 0.12 per unit on its own base) will carry a plant whose largest load is a 400 hp, 480 V induction motor driving a loaded belt conveyor. The motor has a rated full-load current of 477 A and a locked-rotor current of 6.0 times full-load current.
821 words, about 4 min412.47 kV Feeder Voltage Drop: Capacitor Versus Reconductoring
A 12.47 kV, three-phase overhead feeder serves a 3.0 MVA industrial customer at the end of a 5-mile line. The line's positive-sequence impedance is 0.30 + j0.60 Ω per mile and the substation bus is held at 12.47 kV.
905 words, about 5 min5Adding a Standby Generator: Fault Duty and Islanded Coordination
A 13.8 kV utility service feeds a 5 MVA, 13.8/4.16 kV, 6.0% impedance transformer at an industrial plant. The utility's fault level at the point of delivery is 200 MVA.
986 words, about 5 min