L’**A.R.K6B** est un alternateur synchrone triphasé sans balais doté d’une **excitation PMG** et d’un **AVR MX341**, assurant une tension stable et propre sous charges variables. Avec **classe H**, **IP23** et un rendement jusqu’à **94,2 %**, il est parfaitement adapté aux applications **industrielles, mobiles et de location**.
| 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 (reconnectable in star, delta, or parallel star)
Voltage Regulation: ±1.0%
Total Harmonic Distortion (THD): <5% (balanced linear load), <1.5% (no load)
Sustained Short Circuit Current: >300% rated current for 10 seconds
Efficiency: 93.0%–94.2% (depending on load and frequency)
Overload Capacity: 110% for one hour in a six-hour cycle
Telephone Harmonic Factor (THF): <2%
Telephone Interference Factor (TIF): <50
Short Circuit Ratio (1/Xd): 0.09 typical
Power Ratings (Winding 311):
50 Hz: 651–855 kVA (93.6–94.2% efficiency range)
60 Hz: 710–970 kVA (93.0–93.6% efficiency range)
Reactances (Per Unit at Rated kVA):
Xd (Synchronous): 2.42–3.12
X’d (Transient): 0.15–0.20
X’’d (Subtransient): 0.10–0.15
Xq (Quadrature): 2.60–2.94
X’’q (Quadrature Subtransient): 0.20–0.28
X₂ (Negative Sequence): 0.18–0.22
X₀ (Zero Sequence): 0.09
Leakage Reactance (XL): 0.03
Time Constants:
Transient (T’d): 0.106 s
Subtransient (T’’d): 0.013 s
Armature (Ta): 0.035 s
Open Circuit Field (T’do): 2.91 s
Construction & Design
Insulation Class: H (125°C rise at 40°C ambient)
Protection: IP23 (optional IP44 with power reduction)
Cooling System: Self-ventilated air cooling
50 Hz: 2.18 m³/s
60 Hz: 2.63 m³/s
Frame: Rigid steel frame with cast aluminum front and rear covers
Winding: Double-layer stator winding with 2/3 pitch to eliminate 3rd, 9th, and 15th harmonics
Rotor: Damped rotor dynamically balanced per BS6861 standards
Bearings:
Drive End: 6319 (sealed-for-life ball bearing)
Non-Drive End: 6228 (sealed-for-life ball bearing)
Overspeed Capability: 120% of rated speed (2250 rpm)
Leads: 12 reconnectable leads for star, delta, or parallel star configuration
Inertia (WR²): 16.24–16.78 kg·m²
Cooling Air Requirement: 2.18 m³/s @50Hz, 2.63 m³/s @60Hz
Stator Resistance: 0.0039 Ω/phase at 22°C (star connection)
Rotor Resistance: 1.6 Ω at 22°C
Dimensions & Weight
Wound Rotor Weight: 760–865 kg
Wound Stator Weight: 895–938 kg
Complete Generator Weight: 1985–2045 kg
Shipping Weight (Crated): 2023–2030 kg
Packing Dimensions: 183 × 92 × 140 cm
Regulation & Control
Excitation System: PMG excitation with brushless AVR
AVR Models: MX341 (standard), MX321, SX440, SX460, AS440 (optional)
Voltage Regulation Accuracy: ±1.0%
Parallel Operation: Supported (AVR-dependent)
Protection Features:
Stator winding and bearing overheat protection
Anti-condensation heater (optional)
Low-speed voltage drop protection
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
Cooling Air Requirement: 2.18 m³/s (50Hz), 2.63 m³/s (60Hz)
Noise & Vibration: Dynamically balanced per BS6861 standards
Performance Summary
Efficiency Range: 93.0%–94.2% across rated loads
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, telecom, mobile power, refrigeration, rental, railway, and lighting tower systems
