L’**A.R.K6G** est un alternateur triphasé sans balais équipé d’une **excitation PMG** et d’un **AVR MX341**, garantissant une régulation **±1 %**, un **THD < 5 %** et un rendement jusqu’à **95,3 %**. Sa construction robuste avec **classe H** et **IP23** le rend idéal pour les groupes électrogènes **industriels, mobiles, de location 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 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 load), <1.5% (no load)
Sustained Short Circuit Current: >300% rated current for 10 seconds
Efficiency: 94.8–95.3% depending on frequency and load
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: 832–1091 kVA (Efficiency 95.1–95.3%)
60 Hz: 960–1386 kVA (Efficiency 94.8–95.2%)
Reactances (Per Unit at Rated kVA):
Xd (Synchronous): 2.16–2.33
X’d (Transient): 0.15–0.20
X’’d (Subtransient): 0.07–0.08
Xq (Quadrature): 1.70–1.93
X’’q (Quadrature Subtransient): 0.20–0.23
X₂ (Negative Sequence): 0.06–0.09
X₀ (Zero Sequence): 0.07–0.09
Leakage Reactance (XL): 0.02–0.03
Time Constants:
Transient (T’d): 0.115 s
Subtransient (T’’d): 0.015 s
Armature (Ta): 0.038 s
Open Circuit Field (T’do): 3.6 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: 2.18 m³/s (4619 cfm)
60 Hz: 2.63 m³/s (5573 cfm)
Frame: 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: 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): 28.75–29.27 kg·m²
Winding Resistance:
Stator: 0.0015 Ω/phase (22°C, star connection)
Rotor: 2.45 Ω (22°C)
Dimensions & Weight
Rotor Weight: 1129–1190 kg
Stator Weight: 1135–1386 kg
Complete Alternator Weight: 2658–3130 kg (depending on configuration)
Shipping Weight (Crated): 2840–3130 kg
Packing Dimensions: 194 × 105 × 154 cm
Regulation & Control
Excitation System: PMG excitation with brushless AVR
AVR Models: MX341 (standard), optional MX321, SX440, SX460, AS440
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 mechanical standards
Performance Summary
Efficiency Range: 94.8–95.3%
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
