PEC EPE Computer & Allied case studies
PEC EPE Computer & Allied · Put your knowledge to work in context.
The PEC EPE Computer & Allied examination is one of the discipline-specific engineering practice examinations administered under the Pakistan Engineering Council's Engineering Practice Examination (EPE) framework for candidates seeking professional engineer registration. It targets electrical power engineers whose work or intended practice sits at the intersection of power engineering and computing - SCADA and substation automation, protection and control, embedded and microprocessor-based systems, and power system software. The PEC EPE Computer & Allied case studies are 5 cases and about 4,365 words.
1Wrap-Around in a 16-Bit Minute Counter on a Conveyor Controller
An embedded C module on a 16-bit MCU counts minutes between service intervals for a conveyor drive and writes one production record per day: The plant runs 24/7. After six to seven weeks of continuous operation the shift supervisor reports that a daily record sometimes appears in the middle of the afternoon shift, splitting that shift's tonnage across two records; the fault disappears whenever the controller is power-cycled for an unrelated reason.
798 words, about 4 min2One-Hot FSM Lock-Up and Button Debounce in a Guard Interlock Controller
A machine-guard interlock controller is a 12-state one-hot FSM in an FPGA clocked at 50 MHz. The register is reg [11:0] state; , decoded with a case (1'b1) inside an always @(posedge clk) block that ends with state <= next state; and a registered drive output K1 EN that energises the guard-lock solenoid.
835 words, about 4 min3Spurious Earth-Fault Trip on a Healthy 11 kV Feeder During a Through-Fault
An 11 kV, 50 Hz distribution switchboard is fed from a 33/11 kV, 20 MVA transformer with an earthing transformer limiting earth-fault current to 300 A. Each of the six outgoing feeders (maximum load 300 A) has three 400/1 A, 5P10, 10 VA, 5P CTs, Rct <= 4 ohm, connected in residual (star-point) formation to one earth-fault element of a numerical relay.
911 words, about 5 min4Feedwater Flow Loop Hunting After an Oversized Valve Trim Was Fitted
A 250 t/h boiler feedwater line is controlled by a DCS PID loop driving a 4-inch globe valve with a pneumatic positioner. Flow is measured by an electromagnetic flowmeter with damping set to 0 s, feeding a 4–20 mA signal into a 12-bit analogue input card.
919 words, about 5 min5Pressure to Sign a Witnessed Primary-Injection Test Sheet Before Energisation
A junior electrical engineer is seconded to the commissioning team for a new 132 kV GIS substation. Energisation is fixed for Friday and a ten-day grid tie-in outage has been booked; the client has warned of liquidated damages for delay.
902 words, about 5 min