Alternator A.R.K274F

A.R.K274F Alternator – Heavy-Duty Brushless Alternator for Prime and Standby Applications

The A.R.K274F alternator, manufactured by Arken Power Solutions, is a three-phase brushless synchronous alternator engineered for industrial, rental, mobile, and standby generator applications. Featuring a self-excited AVR-controlled system (SX460 standard, SX440 optional), it delivers voltage stability within ±1%, low total harmonic distortion (THD < 5%), and efficiency up to 92.9%. Constructed with Class H insulation, IP23 protection, and dynamic rotor balancing, it ensures exceptional reliability and smooth operation under demanding environmental conditions. The A.R.K274F fully complies with IEC60034, BS5000, VDE0530, NEMA MG1-22, and ISO9001 standards, guaranteeing professional-grade power performance.

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Alternator Model

A.R.K274F

50Hz (kVA)

160

60Hz (kVA)

190
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

  • Rated Power (50Hz): 92.3–145 kVA (continuous/standby, depending on voltage configuration)

  • Rated Power (60Hz): 91.6–192.5 kVA (continuous/standby, depending on voltage configuration)

  • Power Factor: 0.8

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

  • 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 92.9%

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

  • Excitation System: Self-excited, AVR-controlled

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

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

Reactances (Per Unit, Saturated)

  • Xd (Synchronous): 2.02–2.53

  • X’d (Transient): 0.12–0.17

  • X’’d (Subtransient): 0.09–0.14

  • Xq (Quadrature): 1.25–1.53

  • X’’q (Quadrature Subtransient): 0.15–0.19

  • X₂ (Negative Sequence): 0.12–0.16

  • X₀ (Zero Sequence): 0.07–0.10

  • Leakage Reactance (XL): 0.06–0.08

  • Time Constants:

    • Transient (T’d): 0.038 s

    • Subtransient (T’’d): 0.0012 s

    • Open Circuit Field (T’do): 1.0 s

    • Armature (Ta): 0.01 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: 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: 0.0199 Ω/phase (22°C, series star connection)

  • Rotor Resistance: 1.69 Ω (22°C)

  • Rotor Inertia (WR²): 1.7674 kg·m² (single bearing) / 1.7169 kg·m² (double bearing)

Dimensions & Weight

  • Wound Rotor Weight: 210.35 kg (single bearing) / 199.39 kg (double bearing)

  • Wound Stator Weight: 225 kg

  • Complete Alternator Weight: 580 kg (single bearing) / 598 kg (double bearing)

  • Shipping Weight: 613–630 kg (crated)

  • Packing Dimensions: 123 × 67 × 103 cm

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: 91.6–92.9%

  • 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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