Alternator A.R.K4D

A.R.K4D Alternator – Brushless, Efficient, and Industrial-Grade Power Generation

The A.R.K4D alternator, manufactured by Arken Power Solutions, is a high-performance three-phase brushless synchronous alternator designed for prime and standby power applications. Featuring an AVR-controlled voltage regulation system and a self-excited excitation design, it ensures stable voltage output with ±1% regulation and less than 5% total harmonic distortion (THD). Built with Class H insulation, IP23 protection, and a durable steel frame, the A.R.K4D offers exceptional efficiency (up to 93.7%) and long-term reliability. Certified to IEC60034, BS5000, and ISO9001 standards, it provides dependable, low-maintenance performance across industrial, rental, and telecom power systems.

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Alternator Model

A.R.K4D

50Hz (kVA)

295

60Hz (kVA)

350
Control SystemSELF EXCITED
A.V.R. MX341 WITH PMG
Voltage Regulation ± 1.0 %
Sustained Short Circuit>300% OF RATED CURRENT
Rated Power Factor0.8

Electrical Performance

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

  • Frequency: 50 / 60 Hz

  • Power Factor: 0.8

  • Voltage Range: 380/220V – 440/254V (50Hz) / 416/240V – 480/277V (60Hz)

  • Voltage Regulation: ±1.0%

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

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

  • Efficiency: Up to 93.7% at full load

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

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

  • Reactances:

    • Xd: 3.11

    • X’d: 0.20

    • X’’d: 0.14

    • Xq: 2.71

    • X’’q: 0.39

  • Time Constants:

    • Transient (T’d): 0.08 s

    • Subtransient (T’’d): 0.019 s

    • Armature (Ta): 0.018 s

Construction & Design

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

  • Protection: IP23

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

  • Winding: Double-layer stator winding, 2/3 pitch

  • Rotor Type: Damped rotor with high mechanical balance

  • Bearings:

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

    • Non-Drive End: 6314

  • Frame Material: High-grade steel frame with aluminum covers

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

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

  • Moment of Inertia (WR²):

    • Single-bearing: 4.08 kg·m²

    • Double-bearing: 3.88 kg·m²

  • Weight: Approx. 940–950 kg total

    • Stator: 415 kg

    • Rotor: 361 kg

Regulation & Control

  • Excitation System: Self-excited, brushless

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

  • Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (with compatible AVR models)

  • RFI Suppression: Complies with BS EN 61000-6-2 and BS EN 61000-6-4

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

  • Certification: ISO9001 quality management

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: Balanced per BS6861 mechanical standards

Performance Summary

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

  • Recovery Time: <0.5 seconds

  • Locked Rotor Motor Starting: >300% of rated current

  • Efficiency Range: 92–93.7% across full load

  • Suitable Applications: Prime power, standby, telecom, rental, and industrial generators

Datasheet

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