Alternator A.R.K274E

A.R.K274E Alternator – High-Efficiency Brushless Alternator for Continuous and Standby Power

The A.R.K274E alternator, manufactured by Arken Power Solutions, is a three-phase brushless synchronous alternator designed for prime, rental, telecom, mobile, and standby generator systems. Equipped with a self-excited AVR regulation system (SX460 standard, SX440 optional), it provides ±1% voltage accuracy, THD below 5%, and efficiency up to 92.5%. Built with Class H insulation, IP23 protection, and BS6861 dynamic balancing, the A.R.K274E ensures superior stability and clean power output for demanding applications. Fully compliant with IEC60034, BS5000, VDE0530, NEMA MG1-22, and ISO9001, this alternator delivers long-term performance in industrial and commercial generator systems.

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Alternator Model

A.R.K274E

50Hz (kVA)

140

60Hz (kVA)

167.5
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

  • Rated Power (50Hz): 100–150 kVA (depending on voltage configuration)

  • Rated Power (60Hz): 112–175 kVA (depending on voltage configuration)

  • Voltage Range: 190–480 V (series star, parallel star, or delta)

  • Voltage Regulation: ±1.0%

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

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

  • Efficiency: Up to 92.5%

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

  • Excitation System: Self-excited, AVR-controlled

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

  • Short Circuit Ratio (1/Xd): 6.0 typical

Reactances (Per Unit, Saturated)

  • Xd (Synchronous): 1.96–2.68

  • X’d (Transient): 0.12–0.17

  • X’’d (Subtransient): 0.09–0.15

  • Xq (Quadrature): 1.28–1.74

  • X’’q (Quadrature Subtransient): 0.15–0.22

  • X₂ (Negative Sequence): 0.13–0.19

  • X₀ (Zero Sequence): 0.08–0.11

  • Leakage Reactance (XL): 0.07–0.09

  • Time Constants:

    • Transient (T’d): 0.032 s

    • Subtransient (T’’d): 0.01 s

    • Open Circuit Field (T’do): 0.85 s

    • Armature (Ta): 0.007 s

Construction & Design

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

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

  • Cooling: Self-ventilated air cooling

    • 50 Hz: 0.514 m³/s (1090 cfm)

    • 60 Hz: 0.617 m³/s (1308 cfm)

  • Frame: Heavy-duty steel structure 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 to BS6861 standards

  • Bearings:

    • Drive End: 6315-2RS (ISO, sealed-for-life)

    • Non-Drive End: 6310-2RS (ISO, sealed-for-life)

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

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

  • Stator Resistance: 0.0317 Ω/phase (22°C, star connection)

  • Rotor Resistance: 1.34 Ω (22°C)

  • Rotor Inertia (WR²): 1.3271 kg·m² (single bearing) / 1.2765 kg·m² (double bearing)

Dimensions & Weight

  • Wound Rotor Weight: 167.5 kg (single bearing) / 156.6 kg (double bearing)

  • Wound Stator Weight: 180 kg

  • Complete Alternator Weight: 492 kg (single bearing) / 511 kg (double bearing)

  • Shipping Weight: 525–539 kg (crated)

  • Packing Dimensions: 105 × 67 × 103 cm (single bearing) / 123 × 67 × 103 cm (double bearing)

Regulation & Control

  • Excitation: Self-excited, AVR-controlled

  • AVR Models: SX460 (standard), SX440 / AS440 / 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: 0.514–0.617 m³/s depending on frequency

  • Noise & Vibration: Balanced per BS6861 mechanical standards

Performance Summary

  • Efficiency Range: 91.0–92.5%

  • 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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