Генератор A.R.K4E

Electrical Performance

• Type: Three-phase, brushless, self-excited synchronous alternator

• Frequency: 50 / 60 Hz

• Power Factor: 0.8

• Voltage Range: 380/220V – 480/277V (configurable in star, delta, or parallel star)

• Voltage Regulation: ±1.0%

• Total Harmonic Distortion (THD): <5% (balanced load), <1.5% (no load)

• Sustained Short Circuit Current: >300% of rated current for 10 seconds

• Efficiency: Up to 94.3% at full load

• Telephone Harmonic Factor (THF): <2%

• Telephone Interference Factor (TIF): <50

• Overload Capacity: 110% for one hour in a six-hour cycle

• Reactances:

  • Xd: 2.79–3.33

  • X’d: 0.14–0.20

  • X’’d: 0.10–0.14

  • Xq: 2.01–2.80

  • X’’q: 0.25–0.39

• Time Constants:

  • Transient (T’d): 0.08 s

  • Subtransient (T’’d): 0.019 s

  • Armature (Ta): 0.018 s

• Short Circuit Ratio (1/Xd): 0.09 typical

Construction & Design

• Insulation Class: H (125°C rise at 40°C ambient)

• Protection: IP23

• Cooling System: Self-ventilated airflow (0.486 m³/s @50Hz, 0.580 m³/s @60Hz)

• Frame Structure: Steel frame with cast aluminum front and rear covers

• Winding: Double-layer stator winding with 2/3 pitch to minimize harmonic distortion

• Rotor: Damped rotor with high mechanical balance and low vibration

• Bearings:

  • Drive End: 6317 (sealed-for-life ball bearing)

  • Non-Drive End: 6314 (sealed-for-life ball bearing)

• Overspeed Capability: 120% of rated speed (2250 rpm)

• Leads: 12 leads, reconnectable (star, delta, parallel)

• Moment of Inertia (WR²): 4.63 kg·m² (single bearing), 4.43 kg·m² (double bearing)

• Weight:

  • Complete Alternator: 1024–1030 kg

  • Stator: 470 kg

  • Rotor: 377–400 kg

Regulation & Control

• Excitation System: Self-excited, brushless

• AVR Models: SX460 (standard), SX440, AS440, MX341, MX321 (PMG optional)

• Voltage Regulation Accuracy: ±1.0%

• Parallel Operation: Supported (optional AVR required)

• RFI Suppression: Complies with BS EN 61000-6-2 & BS EN 61000-6-4, VDE 0875G/N

• Low-Speed Voltage Drop Protection: Standard feature

• Standards Compliance: IEC60034, BS5000, NEMA MG1-22, ISO8528-3

• Certification: ISO9001 quality assurance

Environmental Parameters

• Operating Temperature: –15°C to +40°C

• Relative Humidity: Up to 95% (non-condensing)

• Altitude: Up to 1000 m without derating

• Noise and Vibration: Conforms to BS6861 mechanical balance standard

Performance Summary

• Voltage Dip (Transient Load): ≤25% at 0.8 power factor

• Recovery Time: <0.5 seconds

• Locked Rotor Motor Starting: >300% rated current

• Efficiency Range: 93.5–94.3% across load range

• Applications: Prime power, standby, rental, telecom, mobile lighting towers, and refrigeration systems