Diesel generator set Generator

three-phasestationary50 Hz

Overview Selecting the correct industrial generator for a site requires assessing load, starting currents, environmental conditions and enclosure type. A complete generator set typically includes a prime mover (diesel engine), alternator, control panel, noise canopy, shock absorbers and an exhaust layout. Diesel engines atomize fuel with filtered air to drive pistons and the crankshaft to produce electrical power. Undersizing or oversizing can increase costs and risk equipment damage.

Key sizing guidance

• Core formula: 100 kW = 125 kVA = 180 A; add a 20% safety margin to the calculated continuous load.
• Motor starting: induction motors can draw 3–5× rated running current at start; include starting spikes and starting method (direct-on-line, soft starter, VFD) in calculations.
• Generator categories:
  • Micro: <10 kW — small tools and basic lighting.
  • Small: 10–200 kW — small job sites and farms.
  • Medium: 200–600 kW — factories and commercial projects.
  • Large: 600–2000 kW — mining, hospitals and heavy-industrial backup.

Noise, canopy and environment Use soundproof canopies for night shifts, urban or residential areas; open-frame units may exceed 90 dB while canopy units with thick acoustic insulation reduce noise below 70 dB. For offshore or high-humidity locations, specify anti-corrosion coatings and marine-grade components. High ambient temperature and altitude reduce generator output by about 5–10%; adjust sizing accordingly.

Fuel and engine choices Diesel engines are preferred for heavy construction and continuous power due to high torque and fuel availability. Small petrol (1–12 kW) and gas-fueled units suit light-duty applications. Select engine brands based on local service and spare-parts networks: international brands (Cummins, Volvo, Perkins) for wide support; Chinese brands (Weichai, Yuchai, SDEC) for competitive lead times and value. Standard diesel models typically ship in 10–15 days; customized gas units require longer lead times.

Case study (summary) A UAE contractor replaced an ageing unit with a 300 kW soundproof diesel generator fitted with upgraded cooling and heavy-duty dust filtration for desert conditions. Outcome: improved site reliability, lower maintenance frequency and faster project delivery.

Generator parameters

• 30 kW — 4 cylinder — 400/230 V — 50 Hz — 1500 rpm — 100 × 115 mm — 54 A — Three-phase four-wire
• 100 kW — 6 cylinder — 400/230 V — 50 Hz — 1500 rpm — 105 × 125 mm — 180 A — Three-phase four-wire
• 150 kW — 6 cylinder — 400/230 V — 50 Hz — 1500 rpm — 105 × 130 mm — 270 A — Three-phase four-wire
• 200 kW — 6 cylinder — 400/230 V — 50 Hz — 1500 rpm — 126 × 130 mm — 360 A — Three-phase four-wire
• 300 kW — 6 cylinder — 400/230 V — 50 Hz — 1500 rpm — 126 × 155 mm — 540 A — Three-phase four-wire
• 400 kW — 6 cylinder — 400/230 V — 50 Hz — 1500 rpm — 135 × 160 mm — 720 A — Three-phase four-wire

Additional technical notes Manufacturers offer soundproof canopy or open-frame solutions, custom canopy colors and optional cooling or filtration upgrades for extreme environments. Initial service: change engine oil and filter after the first 50 operating hours; routine checks every 250–300 hours. In dusty environments increase air-filter replacement frequency to extend engine life.