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Alternator A.R.K184EF

A.R.K184EF Alternator – High-Efficiency Brushless Alternator for Reliable Industrial Power

The A.R.K184EF alternator from Arken Power Solutions is a three-phase, brushless, self-excited synchronous alternator designed for stable and efficient power generation in industrial, rental, and standby systems. With a self-excited excitation system regulated by an SX460 AVR, it provides ±1% voltage regulation, low waveform distortion (<5% THD), and high efficiency up to 87.5%. Built with Class H insulation, IP23 protection, and a robust steel structure, it ensures long-term reliability and superior performance under variable load conditions. Fully compliant with IEC60034, BS5000, NEMA MG1-22, and ISO9001, the A.R.K184EF offers dependable power for demanding applications.

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Alternator Model

A.R.K184EF

50Hz (kVA)

25

60Hz (kVA)

30
Control SystemSELF EXCITED
A.V.R. OPTIONAL SX440
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: 190–480 V (reconnectable in star, delta, or parallel star configuration)

  • Voltage Regulation: ±1.0%

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

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

  • Efficiency: Up to 87.5% at full load (depending on voltage and frequency)

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

  • Excitation System: Self-excited, AVR-controlled

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

  • Short Circuit Ratio (1/Xd): 6.1 typical

Reactances (Per Unit at Rated kVA)

  • Xd (Synchronous): 1.39–1.79

  • X’d (Transient): 0.14–0.18

  • X’’d (Subtransient): 0.09–0.12

  • Xq (Quadrature): 0.75–0.90

  • X’’q (Quadrature Subtransient): 0.16–0.20

  • X₂ (Negative Sequence): 0.12–0.16

  • X₀ (Zero Sequence): 0.06–0.08

  • Leakage Reactance (XL): 0.055–0.073

  • Time Constants:

    • Transient (T’d): 0.022 s

    • Subtransient (T’’d): 0.0035 s

    • Armature (Ta): 0.0065 s

    • Open Circuit Field (T’do): 0.45 s

Construction & Design

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

  • Protection: IP23 (optional IP44 with 5–10% power derating)

  • Cooling: Self-ventilated air cooling

    • 50 Hz: 0.071 m³/s (150 cfm)

    • 60 Hz: 0.09 m³/s (191 cfm)

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

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

  • Rotor: Damped cage rotor, dynamically balanced per BS6861 standards

  • Bearings:

    • Drive End: 6309-2RS (sealed-for-life ball bearing)

    • Non-Drive End: 6306-2RS (sealed-for-life ball bearing)

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

  • Leads: 12 reconnectable leads

  • Stator Resistance: 0.25 Ω/phase (22°C, star connection)

  • Rotor Resistance: 0.74 Ω (22°C)

  • Rotor Inertia (WR²): 0.1568 kg·m²

Dimensions & Weight

  • Rotor Weight: 49.7 kg

  • Stator Weight: 55 kg

  • Complete Alternator Weight: 151 kg

  • Shipping Weight: 170 kg (crated)

  • Packing Dimensions: 84 × 59 × 75 cm

Regulation & Control

  • Excitation: Self-excited, AVR-controlled

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

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (AVR-dependent)

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

  • Standards Compliance: IEC60034, GB755, BS5000, VDE0530, 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: 0.071–0.09 m³/s

  • Noise & Vibration: Balanced per BS6861 mechanical standards

Performance Summary

  • Efficiency Range: 86–87.5%

  • 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, lighting tower, refrigeration, and railway generator systems

Datasheet

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