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Alternator ARK5D

A.R.K5D Alternator – Brushless, PMG Excited, and Industrial-Grade High-Efficiency Alternator

The A.R.K5D alternator, engineered by Arken Power Solutions, is a robust three-phase, brushless synchronous alternator with a PMG excitation system and MX341 AVR, ensuring exceptional voltage stability and fast response under load variations. Designed for both prime and standby applications, it delivers ±1% voltage regulation and <5% total harmonic distortion (THD) for smooth, clean power output. With Class H insulation, IP23 protection, and a rigid steel structure, the A.R.K5D guarantees reliable operation and up to 94.9% efficiency, even under demanding industrial environments. Fully compliant with IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, it is the ideal choice for heavy-duty generators used in telecom, rental, railway, mobile, and refrigeration systems.

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Alternator Model

A.R.K5D

50Hz (kVA)

550

60Hz (kVA)

594
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 with PMG excitation

  • Frequency: 50 / 60 Hz

  • Rated Power Factor: 0.8

  • Rated 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 94.9% 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): 2.72–3.52

    • X’d (Transient): 0.12–0.17

    • X’’d (Subtransient): 0.08–0.12

    • Xq (Quadrature): 1.85–2.87

    • X’’q (Quadrature Subtransient): 0.20–0.31

    • X₂ (Negative Sequence): 0.14–0.22

    • X₀ (Zero Sequence): 0.07–0.10

  • Time Constants:

    • Transient (T’d): 0.08 s

    • Subtransient (T’’d): 0.012 s

    • Armature (Ta): 0.018 s

    • Open Circuit Field (T’do): 2.2 s

  • Efficiency at Load (Power Factor 0.8):

    • 50Hz: 94.8–95.1%

    • 60Hz: 94.5–94.9%

Construction & Design

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

  • Protection: IP23 (optional IP44 available with reduced output)

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

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

  • Stator: Double-layer winding, 2/3 pitch to eliminate triple harmonics

  • Rotor: Damped rotor dynamically balanced per BS6861 standards

  • Bearings:

    • Drive End: 6220-2RS (sealed-for-life ball bearing)

    • Non-Drive End: 6314-2RS (sealed-for-life ball bearing)

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

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

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

  • Mechanical Balance: Half-key dynamic balance in double bearing structure

  • Vibration: Controlled within BS6861 limits

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

Dimensions & Weight

  • Weight (Wound Rotor): 563 kg (single bearing) / 535 kg (double bearing)

  • Weight (Complete Alternator): 1393–1395 kg

  • Weight (Wound Stator): 657 kg

  • WR² Inertia: 8.0068 kg·m² (single bearing) / 7.7289 kg·m² (double bearing)

  • Shipping Weight: 1485 kg

  • Packing Dimensions: 166 × 87 × 124 cm

Regulation & Control

  • Excitation System: PMG excitation with brushless design

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

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (AVR-dependent)

  • Anti-Condensation Heater: Optional

  • Protection Features: Stator winding and bearing overheat protection

  • RFI Suppression: Integrated, compliant with industrial EMC standards

  • 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: 1.035 m³/s (50Hz), 1.312 m³/s (60Hz)

  • Noise & Vibration: Low, per BS6861 standard

Performance Summary

  • Efficiency Range: 94.5%–95.1% (depending on frequency and load)

  • Voltage Dip under 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, lighting tower, railway, and refrigeration systems

Datasheet

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