L’**A.R.K5D** est un alternateur synchrone triphasé sans balais offrant une tension stable (**±1 %**) et un rendement jusqu’à **94,9 %**. Sa conception robuste le rend idéal pour les applications **prime, standby, location et télécom**.
| 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
Rated Power Factor: 0.8
Rated 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% of rated current for 10 seconds
Efficiency: Up to 94.9% at full load
Overload Capacity: 110% for one hour in six-hour cycles
Telephone Harmonic Factor (THF): <2%
Telephone Interference Factor (TIF): <50
Short Circuit Ratio (1/Xd): 0.09 typical
Reactances (Per Unit at Rated kVA):
Xd (Synchronous): 2.72–3.52
X’d (Transient): 0.12–0.17
X’’d (Subtransient): 0.08–0.12
Xq (Quadrature): 1.85–2.87
X’’q (Quadrature Subtransient): 0.20–0.31
X₂ (Negative Sequence): 0.14–0.22
X₀ (Zero Sequence): 0.07–0.10
Time Constants:
Transient (T’d): 0.08 s
Subtransient (T’’d): 0.012 s
Armature (Ta): 0.018 s
Open Circuit Field (T’do): 2.2 s
Efficiency at Load (Power Factor 0.8):
50Hz: 94.8–95.1%
60Hz: 94.5–94.9%
Construction & Design
Insulation Class: H (125°C rise at 40°C ambient)
Protection: IP23 (optional IP44 available with reduced output)
Cooling: Self-ventilated air cooling (1.035 m³/s @50Hz, 1.312 m³/s @60Hz)
Frame Material: Rigid steel frame with cast aluminum front and rear covers
Stator: Double-layer winding, 2/3 pitch to eliminate triple 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)
Winding Leads: 12 reconnectable leads (star, delta, parallel star)
RFI Suppression: Complies with BS EN 61000-6-2 & BS EN 61000-6-4, VDE 0875G/N
Mechanical Balance: Half-key dynamic balance in double bearing structure
Vibration: Controlled within BS6861 limits
Cooling Air Requirement: 1.035 m³/s (50Hz), 1.312 m³/s (60Hz)
Dimensions & Weight
Weight (Wound Rotor): 563 kg (single bearing) / 535 kg (double bearing)
Weight (Complete Alternator): 1393–1395 kg
Weight (Wound Stator): 657 kg
WR² Inertia: 8.0068 kg·m² (single bearing) / 7.7289 kg·m² (double bearing)
Shipping Weight: 1485 kg
Packing Dimensions: 166 × 87 × 124 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)
Anti-Condensation Heater: Optional
Protection Features: Stator winding and bearing overheat protection
RFI Suppression: Integrated, compliant with industrial EMC standards
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: 1.035 m³/s (50Hz), 1.312 m³/s (60Hz)
Noise & Vibration: Low, per BS6861 standard
Performance Summary
Efficiency Range: 94.5%–95.1% (depending on frequency and load)
Voltage Dip under 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 systems
