UPDA Electrical case studies
UPDA Electrical · Put your knowledge to work in context.
The UPDA Electrical Engineer certification is a professional assessment used in Qatar to evaluate the competence of electrical engineers working in the urban planning and development sector. It is intended for engineers who design, supervise, or review electrical systems for buildings, infrastructure, and utility projects, and who need to demonstrate that their technical knowledge meets local expectations. The UPDA Electrical case studies are 5 cases and about 3,308 words.
1Sizing a Transformer for a Growing Commercial Building
A three-storey office building has a calculated maximum demand of 420 kVA at 0.85 power factor lagging. The existing 500 kVA, 11 kV/400 V distribution transformer serves only this building and runs at 78% loading during peak hours with a top-oil temperature rise of 52 K against a rated 55 K rise.
623 words, about 3 min2Discrimination Between Upstream and Downstream Protection
A 400 V TN-S distribution board feeds a 75 kW, 0.8 pf induction motor through a 150 A MCCB with a 10x magnetic setting, and a 63 A submain to a lighting panel through a 63 A MCB (type C). A fault at the lighting panel trips both the 63 A MCB and the 150 A MCCB, blacking out the whole board.
612 words, about 3 min3Earthing Design for a Rooftop PV Array on a TN-C-S Supply
A 250 kWp rooftop PV array is being added to a commercial building supplied by a TN-C-S (PME) system. The inverter is transformerless (no galvanic isolation).
712 words, about 4 min4Generator vs. Utility Paralleling for a Hospital Load
A hospital has a 1.2 MVA standby diesel generator, currently configured for open-transition (break-before-make) operation with the utility supply. The facility manager wants to run the generator in parallel with the utility during peak tariff periods to reduce energy cost, using the existing generator and a new synchronising panel.
645 words, about 3 min5Cable Derating and Voltage Drop for a Long Pump Feeder
A 90 kW, 400 V, 0.86 pf, 92% efficient pump is fed by a 240 m run of four-core XLPE/SWA cable installed in a buried duct bank with three other loaded cables. The designer proposes 95 mm2 copper conductors.
716 words, about 4 min