Engineer Electricity case studies

Engineer Electricity · Put your knowledge to work in context.

The Engineer Electricity credential is a professional certification that assesses whether a candidate can practise electrical engineering at a responsible-charge level. It suits practising electrical engineers, plant and utility engineers, consulting designers, and graduates moving from academic study into accountable engineering work. The Engineer Electricity case studies are 5 cases and about 5,965 words.

Capacitor Bank Resonance on a Drive-Loaded 400 V Board

A 400 V, 50 Hz TN-S board is fed by a dedicated 500 kVA transformer with 5.5% impedance. The board supplies a 132 kW 6-pulse DC drive (current THD 28% at full load) and a 150 kVAr automatically switched capacitor bank connected to the same busbar with no series reactors.

1,095 words, about 5 min 2

DC Bus Overvoltage on a High-Inertia Fan Drive

A 75 kW, 400 V, 4-pole cage motor drives a high-inertia fan through a 6-pulse voltage-source drive. Motor plus load inertia referred to the motor shaft is 22 kg·m², and the drive must stop the fan from 1,480 rpm to standstill in 8 s on every cycle; the complete cycle time is 120 s.

1,206 words, about 6 min 3

Cable Derating and Device Selection for a Roof-Void Pump Feeder

A 400 V, 50 Hz TN-S warehouse extension feeds a 45 kW, 4-pole pump motor (efficiency 0.93, power factor 0.86) through a 65 m run of 4-core XLPE/SWA copper cable. The cable is clipped to a steel tray in an unventilated roof void where the measured air temperature reaches 45 °C, and it shares the tray with three other loaded circuits, all bunched and touching.

1,157 words, about 6 min 4

Transformer High-Set Trips and LV Earth-Fault Detection

A 1,000 kVA, 11 kV/433 V, Dyn11 distribution transformer with 6% impedance feeds a 433 V switchboard through a 1,600 A air circuit breaker. The 11 kV side is protected by a single overcurrent relay on a 100/5 A CT, with a pickup of 1.1 times transformer full-load current and a high-set (instantaneous) element set at 6 times full-load current.

1,222 words, about 6 min 5

Transformer Selection and Energisation Pressure on a PV Project

A client is choosing the distribution transformer for a new 433 V plant. Average demand is 900 kVA on a nearly flat profile over 8,760 hours.

1,285 words, about 6 min