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Alternator A.R.K274D

A.R.K274D Alternator – Heavy-Duty Brushless Alternator for Continuous and Standby Power Systems

The A.R.K274D alternator, manufactured by Arken Power Solutions, is a three-phase brushless synchronous alternator engineered for industrial, rental, and standby power generation. With its self-excited AVR system (SX460 standard, SX440 optional), it provides ±1% voltage regulation, THD below 5%, and efficiency up to 91.6%. Designed with Class H insulation, IP23 protection, and dynamically balanced rotor, it ensures durability and reliable performance under demanding conditions. Complying with IEC60034, BS5000, VDE0530, NEMA MG1-22, and ISO9001, it is suitable for applications such as rental, telecom, mobile, railway, refrigeration, and standby generator systems.

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Alternator Model

A.R.K274D

50Hz (kVA)

120

60Hz (kVA)

137.5
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 Voltage Range: 190–480 V (reconfigurable for star, delta, or parallel star connection)

  • 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 91.6% depending on load and voltage

  • 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): 2.06–2.52

  • X’d (Transient): 0.16–0.21

  • X’’d (Subtransient): 0.10–0.15

  • Xq (Quadrature): 1.17–1.49

  • X’’q (Quadrature Subtransient): 0.14–0.21

  • X₂ (Negative Sequence): 0.12–0.17

  • X₀ (Zero Sequence): 0.07–0.10

  • Leakage Reactance (XL): 0.06–0.07

  • Time Constants:

    • Transient (T’d): 0.031 s

    • Subtransient (T’’d): 0.01 s

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

    • Armature (Ta): 0.0073 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: 0.038 Ω/phase (22°C, series star connection)

  • Rotor Resistance: 1.26 Ω (22°C)

  • Rotor Inertia (WR²): 1.1962 kg·m² (single bearing) / 1.1455 kg·m² (double bearing)

Dimensions & Weight

  • Wound Rotor Weight: 149.37 kg (single bearing) / 122.82 kg (double bearing)

  • Wound Stator Weight: 141 kg

  • Complete Alternator Weight: 431 kg (single bearing) / 450 kg (double bearing)

  • Shipping Weight: 458–476 kg (crated)

  • Packing Dimensions: 105 × 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: 90.8–91.6%

  • 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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