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Alternator A.R.K6C

A.R.K6C Alternator – PMG Excited, Brushless, and High-Performance Industrial Alternator

The A.R.K6C alternator, designed by Arken Power Solutions, is a three-phase, brushless synchronous alternator featuring a PMG excitation system and MX341 AVR. With excellent voltage regulation (±1%) and total harmonic distortion under 5%, it ensures consistent and clean power delivery for industrial, rental, and standby generators. Built with Class H insulation, IP23 protection, and steel and cast aluminum construction, it guarantees high mechanical strength, reliability, and long service life. Offering up to 94.2% efficiency, the A.R.K6C meets international standards such as IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, making it ideal for continuous heavy-duty operation in demanding environments.

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Alternator Model

A.R.K6C

50Hz (kVA)

800

60Hz (kVA)

916
Control System SELF 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 synchronous alternator with PMG excitation

  • Frequency: 50 / 60 Hz

  • Power Factor: 0.8

  • Voltage Range: 380/220V – 480/277V (reconnectable 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: 93.0%–94.2% (depending on load and frequency)

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

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

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

  • Power Ratings (Winding 311):

    • 50 Hz: 697–880 kVA (Efficiency 93.6–94.2%)

    • 60 Hz: 790–1045 kVA (Efficiency 93.4–93.9%)

  • Reactances (Per Unit at Rated kVA):

    • Xd (Synchronous): 2.22–2.69

    • X’d (Transient): 0.19–0.20

    • X’’d (Subtransient): 0.10–0.13

    • Xq (Quadrature): 2.56–2.92

    • X’’q (Quadrature Subtransient): 0.19–0.24

    • X₂ (Negative Sequence): 0.16–0.22

    • X₀ (Zero Sequence): 0.08–0.09

    • Leakage Reactance (XL): 0.03

  • Time Constants:

    • Transient (T’d): 0.106 s

    • Subtransient (T’’d): 0.013 s

    • Armature (Ta): 0.034 s

    • Open Circuit Field (T’do): 2.95 s

Construction & Design

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

  • Protection: IP23 (optional IP44 with power reduction)

  • Cooling System: Self-ventilated air cooling (2.18 m³/s @50Hz, 2.63 m³/s @60Hz)

  • Frame: Rigid steel frame with cast aluminum front and rear covers

  • Stator: Double-layer winding, 2/3 pitch design eliminates triple harmonics

  • Rotor: Damped rotor dynamically balanced per BS6861 standards

  • Bearings:

    • Drive End: 6319 (sealed-for-life ball bearing)

    • Non-Drive End: 6228 (sealed-for-life ball bearing)

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

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

  • Inertia (WR²): 17.1–17.6 kg·m²

  • Cooling Air Requirement: 2.18 m³/s (50Hz), 2.63 m³/s (60Hz)

  • Winding Resistances:

    • Stator: 0.0034 Ω/phase (22°C, star connection)

    • Rotor: 1.60 Ω (22°C)

Dimensions & Weight

  • Rotor Weight: 788–907 kg

  • Stator Weight: 744–907 kg

  • Complete Alternator Weight: 2076–2173 kg

  • Shipping Weight (Crated): 2120–2200 kg

  • Packing Dimensions: 183 × 92 × 140 cm

Regulation & Control

  • Excitation System: PMG excitation with brushless AVR

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

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (AVR-dependent)

  • Protection Features:

    • Stator winding and bearing overheat protection

    • Anti-condensation heater (optional)

    • Low-speed voltage drop protection

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

  • Standards Compliance: IEC60034, GB755, BS5000, NEMA MG1-22, CSA C22.2-100, AS1359

  • Certification: ISO9001 Quality Management System

Environmental Parameters

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

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

  • Altitude: Up to 1000 m without derating

  • Cooling Air Requirement: 2.18 m³/s (50Hz), 2.63 m³/s (60Hz)

  • Noise & Vibration: Balanced per BS6861 standards

Performance Summary

  • Efficiency Range: 93.0–94.2%

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

  • Recovery Time: <0.5 seconds

  • Locked Rotor Motor Starting: >300% rated current

  • Applications: Prime power, standby, telecom, mobile power, refrigeration, rental, railway, and lighting tower generator systems

Datasheet

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