Генератор A.R.K7F

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 (configurable 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: Up to 96.4% depending on frequency and load

• 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): 0.19 typical

• Power Ratings (Winding 311):

  • 50 Hz: 1100–1375 kVA (Efficiency 96.0–96.4%)

  • 60 Hz: 1250–1650 kVA (Efficiency 95.7–96.2%)

• Reactances (Per Unit at Rated kVA):

  • Xd (Synchronous): 2.26–3.23

  • X’d (Transient): 0.18–0.25

  • X’’d (Subtransient): 0.07–0.13

  • Xq (Quadrature): 2.04–3.16

  • X’’q (Quadrature Subtransient): 0.22–0.27

  • X₂ (Negative Sequence): 0.14–0.16

  • X₀ (Zero Sequence): 0.04–0.06

  • Leakage Reactance (XL): 0.03

• Time Constants:

  • Transient (T’d): 0.3 s

  • Subtransient (T’’d): 0.03 s

  • Armature (Ta): 0.06 s

  • Open Circuit Field (T’do): 3.16 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: 2.64 m³/s (5600 cfm)

  • 60 Hz: 3.17 m³/s (6720 cfm)

• Frame: Rigid steel structure with cast aluminum front and rear covers

• Stator: Double-layer winding, 2/3 pitch design eliminates triple harmonics

• Rotor: Damped rotor dynamically balanced to 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 (star, delta, or parallel star)

• Inertia (WR²): 36.49–37.49 kg·m²

• Winding Resistance:

  • Stator: 0.00126 Ω/phase (22°C, star connection)

  • Rotor: 1.41 Ω (22°C)

Dimensions & Weight

• Rotor Weight: 1181–1244 kg

• Stator Weight: 1541 kg

• Complete Alternator Weight: 2982–3130 kg

• Shipping Weight (Crated): 3054–3070 kg

• Packing Dimensions: 194 × 105 × 154 cm

Regulation & Control

• Excitation System: PMG excitation with brushless AVR

• AVR Models: MX321 (standard), optional MX341, 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: 2.64–3.17 m³/s depending on frequency

• Noise & Vibration: Dynamically balanced per BS6861 mechanical standards

Performance Summary

• Efficiency Range: 95.7–96.4%

• 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, railway, lighting tower, and refrigeration generator systems