L’**A.R.K5FS** offre une excellente stabilité de tension (**±1 %**), une faible distorsion harmonique (**THD < 5 %**) et une grande robustesse mécanique. Équipé d’une **excitation PMG** et d’un **AVR MX341**, il est idéal pour les systèmes **industriels, télécom et standby** opérant en conditions difficiles.
| Système d’excitation | SELF EXCITED |
| A.V.R. | MX341 WITH PMG |
| Régulation de tension à régime établi | ± 1.0 % |
| Court-circuit prolongé | >300% OF RATED CURRENT |
| Facteur de puissance nominal | 0.8 |
Electrical Performance
Type: Three-phase, brushless synchronous alternator with PMG excitation
Frequency: 50 / 60 Hz
Power Factor: 0.8
Voltage Range: 380/220V – 480/277V (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% rated current for 10 seconds
Efficiency: Up to 95.3%
Overload Capacity: 110% for one hour in a six-hour period
Telephone Harmonic Factor (THF): <2%
Telephone Interference Factor (TIF): <50
Short Circuit Ratio (1/Xd): 0.09 typical
Waveform Distortion: <1.5% (no load), <5% (linear load)
Sustained Short Circuit: 300% rated current for 10 seconds
Reactances (Per Unit at Rated kVA)
Xd (Synchronous): 2.83–3.53
X’d (Transient): 0.12–0.17
X’’d (Subtransient): 0.09–0.12
Xq (Quadrature): 2.21–2.82
X’’q (Quadrature Subtransient): 0.24–0.34
X₂ (Negative Sequence): 0.16–0.23
X₀ (Zero Sequence): 0.06–0.10
Leakage Reactance (XL): 0.05–0.06
Transient Time Constant (T’d): 0.08 s
Subtransient Time Constant (T’’d): 0.012 s
Armature Time Constant (Ta): 0.019 s
Open Circuit Field Time Constant (T’do): 2.5 s
Construction & Design
Insulation Class: H (125°C rise at 40°C ambient)
Protection: IP23 (optional IP44 with derating)
Cooling: Self-ventilated air cooling (1.035 m³/s @50Hz, 1.312 m³/s @60Hz)
Frame: Steel frame with cast aluminum front and rear covers
Stator: Double-layer winding, 2/3 pitch eliminates 3rd, 9th, 15th 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)
Leads: 12 reconnectable leads for versatile connections
Mechanical Balance: Half-key dynamic balance in double bearing structure
Cooling Air Requirement: 1.035 m³/s (50Hz), 1.312 m³/s (60Hz)
Stator Winding Resistance: 0.0043 Ω/phase (at 22°C, star connection)
Rotor Winding Resistance: 1.96 Ω (at 22°C)
Dimensions & Weight
Rotor Weight: 617 kg (single bearing) / 588 kg (double bearing)
Stator Weight: 722 kg
Complete Alternator Weight: 1543 kg (single bearing) / 1535 kg (double bearing)
Inertia (WR²): 8.98 kg·m² (single bearing) / 8.70 kg·m² (double bearing)
Shipping Weight: 1635 kg (50Hz) / 1625 kg (60Hz)
Packing Dimensions: 166 × 87 × 124 cm
Regulation & Control
Excitation System: PMG excitation with brushless AVR control
AVR Model: MX341 (standard), optional SX460, SX440, AS440, MX321
Voltage Regulation Accuracy: ±1.0%
Parallel Operation: Supported with compatible AVR
Protection Features:
Stator winding and bearing overheat protection
Anti-condensation heater (optional)
RFI Suppression: Complies with BS EN 61000-6-2, BS EN 61000-6-4, VDE 0875G/N
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
Noise & Vibration: Dynamically balanced per BS6861 standards
Performance Summary
Efficiency Range: 94.5–95.3%
Voltage Dip (Transient Load): ≤25% at 0.8 PF
Recovery Time: <0.5 seconds
Locked Rotor Motor Starting: >300% of rated current
Applications: Prime power, standby, rental, telecom, mobile power, refrigeration, lighting tower, and railway generator systems
