L’**A.R.K6D** est un alternateur triphasé sans balais équipé d’une **excitation PMG** et d’un **AVR MX341**, garantissant une excellente stabilité de tension (±1 %) et une distorsion harmonique **< 5 %**. Sa construction robuste avec **classe H** et **IP23** assure une performance durable pour les groupes électrogènes **industriels et standby**.
| 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, self-excited synchronous alternator with PMG excitation
Frequency: 50 / 60 Hz
Power Factor: 0.8
Voltage Range: 380/220V – 480/277V (configurable in 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: 94.5–95.6% depending on load and frequency
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
Power Ratings (Winding 311):
50 Hz: 830–1000 kVA (Efficiency 95.2–95.6%)
60 Hz: 913–1219 kVA (Efficiency 94.5–95.4%)
Reactances (Per Unit at Rated kVA):
Xd (Synchronous): 2.70–3.37
X’d (Transient): 0.19–0.23
X’’d (Subtransient): 0.08–0.10
Xq (Quadrature): 1.77–3.13
X’’q (Quadrature Subtransient): 0.18–0.25
X₂ (Negative Sequence): 0.16–0.20
X₀ (Zero Sequence): 0.08–0.10
Leakage Reactance (XL): 0.02–0.03
Time Constants:
Transient (T’d): 0.18 s
Subtransient (T’’d): 0.025 s
Armature (Ta): 0.04 s
Open Circuit Field (T’do): 2.44 s
Construction & Design
Insulation Class: H (125°C rise at 40°C ambient)
Protection: IP23 (optional IP44 with 5–10% power reduction)
Cooling: Self-ventilated air cooling
50 Hz: 1.614 m³/s (3420 cfm)
60 Hz: 1.961 m³/s (4156 cfm)
Frame: Rigid steel structure with cast aluminum front and rear covers
Stator: Double-layer winding, 2/3 pitch eliminates 3rd, 9th, and 15th harmonics
Rotor: Damped rotor dynamically balanced per BS6861 standards
Bearings:
Drive End: 6224 (ISO, sealed-for-life ball bearing)
Non-Drive End: 6317 (ISO, sealed-for-life ball bearing)
Overspeed Capability: 120% of rated speed (2250 rpm)
Leads: 12 reconnectable leads (star, delta, or parallel star)
Inertia (WR²): 19.4965 kg·m² (2-bearing) / 20.0438 kg·m² (1-bearing)
Cooling Air Requirement: 1.614–1.961 m³/s
Winding Resistance:
Stator: 0.003 Ω/phase (22°C, star connection)
Rotor: 1.88 Ω (22°C)
Dimensions & Weight
Rotor Weight: 866–1010 kg
Stator Weight: 1010 kg
Complete Alternator Weight: 2117–2180 kg
Shipping Weight (Crated): 2145–2173 kg
Packing Dimensions: 183 × 92 × 140 cm
Regulation & Control
Excitation System: PMG excitation with brushless design
AVR Model: MX341 (standard), optional SX460, SX440, AS440, MX321
Voltage Regulation Accuracy: ±1.0%
Parallel Operation: Supported (AVR-dependent)
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
Cooling Air Requirement: 1.614 m³/s (50Hz), 1.961 m³/s (60Hz)
Noise & Vibration: Balanced to BS6861 mechanical standards
Performance Summary
Efficiency Range: 94.5–95.6%
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, railway, and refrigeration generator systems
