Alternator A.R.K5C

A.R.K5C Alternator – Brushless, PMG Excited, and High-Efficiency Industrial Alternator

The A.R.K5C alternator, developed by Arken Power Solutions, is a three-phase, brushless synchronous alternator with a PMG excitation system and MX341 AVR, designed to deliver superior voltage stability, fast transient response, and consistent power output. With ±1% voltage regulation and less than 5% total harmonic distortion (THD), it ensures clean and reliable performance across demanding applications. Built with Class H insulation, IP23 protection, and a rigid steel frame, it provides long-term durability and up to 94.9% efficiency. Certified to IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, the A.R.K5C alternator is ideal for prime power, standby, mobile, and industrial generator systems.

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Alternator Model

A.R.K5C

50Hz (kVA)

500

60Hz (kVA)

550

Electrical Performance

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

  • 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% (linear load), <1.5% (no load)

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

  • Efficiency: 93.5%–94.9% at full load

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

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

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

  • Reactances (Per Unit at Rated kVA):

    • Xd (Synchronous): 2.74–3.94

    • X’d (Transient): 0.13–0.18

    • X’’d (Subtransient): 0.10–0.13

    • Xq (Quadrature): 1.98–3.12

    • X’’q (Quadrature Subtransient): 0.26–0.34

    • X₂ (Negative Sequence): 0.14–0.23

    • X₀ (Zero Sequence): 0.08–0.11

  • Time Constants:

    • Transient (T’d): 0.08 s

    • Subtransient (T’’d): 0.012 s

    • Armature (Ta): 0.017 s

    • Open Circuit Field (T’do): 2.0 s

Construction & Design

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

  • Protection: IP23

  • Cooling System: Self-ventilated air cooling (1.035 m³/s @50Hz, 1.312 m³/s @60Hz)

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

  • Winding: Double-layer stator winding with 2/3 pitch design to eliminate triple harmonics

  • Rotor: Damped rotor with dynamic balance per BS6861

  • Bearings:

    • Drive End: 6220 (sealed-for-life ball bearing)

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

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

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

  • Moment of Inertia (WR²):

    • Single Bearing: 6.89 kg·m²

    • Double Bearing: 6.61 kg·m²

  • Weight:

    • Complete Alternator: 1263–1275 kg

    • Rotor: 473–502 kg

    • Stator: 584 kg

  • Shipping Weight: 1355 kg (50Hz) / 1395 kg (60Hz)

  • Packing Dimensions: 166 × 87 × 124 cm

Regulation & Control

  • Excitation System: PMG excitation with brushless design

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

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (with compatible AVR)

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

  • Low-Speed Voltage Drop Protection: Standard

  • 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

  • Noise & Vibration: Balanced per BS6861 mechanical standards

  • Cooling Air Requirement: 1.035 m³/s @50Hz, 1.312 m³/s @60Hz

Performance Summary

  • Efficiency Range: 93.5%–94.9% (depending on voltage and frequency)

  • 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, rental, telecom, mobile, railway, and refrigeration generator systems

Datasheet

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