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Alternator PRO18L F/4

Linz Electric PRO18L F/4 Alternator – 50 kVA Three-Phase Brushless Alternator with AVR

The PRO18L F/4 alternator from Linz Electric is a 4-pole, three-phase brushless synchronous alternator with AVR (Automatic Voltage Regulation) for stable and precise power generation. Delivering 50 kVA at 50 Hz and 60 kVA at 60 Hz, it provides excellent efficiency (up to 92%) and low harmonic distortion (<3 % THD). Built with Class H insulation, IP23 protection, and a self-excited control system, the PRO18L F/4 ensures long-term reliability and durability for industrial generator sets operating in demanding environments.

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Alternator Model

PRO18L F/4

50Hz (kVA)

50

60Hz (kVA)

60
Control Systemself-excited
A.V.R.HVR11 or HVR30
Voltage Regulation± 1 %
Sustained Short Circuit> 250 % of rated current
Rated Power Factor0.8

  • General Characteristics:
    The Linz Electric PRO18L F/4 is a self-excited, brushless, three-phase synchronous alternator engineered for heavy-duty generator systems. It operates with an AVR-controlled excitation system (models HVR11 or HVR30) that maintains voltage stability within ±1 %. Designed for 1500 rpm (50 Hz) or 1800 rpm (60 Hz), it provides a power factor of 0.8 and complies with EN60034-1, ISO 8528-3, and EN55011 standards.

  • Electrical Specifications:
    • Rated Power: 50 kVA (50 Hz) / 60 kVA (60 Hz)
    • Rated Power Factor: 0.8
    • Rated Voltage Range (Star Connection): 380 – 480 V
    • Frequency: 50 Hz / 60 Hz
    • Efficiency (Class H): 89.4 % – 91.2 % at 50 Hz / 90 % – 92 % at 60 Hz
    • Total Harmonic Distortion (THD): < 3 % at full and no load
    • Voltage Regulation Accuracy: ± 1 %
    • Sustained Short-Circuit Capability: > 250 % of rated current
    • Overload Capacity: 110 % for one hour every six hours
    • Air Flow Requirement: 10 m³/min (50 Hz) / 11.5 m³/min (60 Hz)
    • RFI Suppression: EN55011 compliant

  • Winding and Excitation System:
    • Stator Type: Double-layer with auxiliary winding
    • Rotor Type: Winding with damping cage
    • Winding Pitch: 2/3
    • Number of Leads: 12
    • Stator Winding Resistance: 0.05 Ω @ 20 °C
    • Rotor Winding Resistance: 4.53 Ω @ 20 °C
    • Exciter Stator Resistance: 13 Ω @ 20 °C
    • Exciter Rotor Resistance: 0.72 Ω @ 20 °C
    • Excitation Current: 0.91 A (no load) / 2.25 A (full load)

  • Reactances and Time Constants (50 Hz):
    • Xd (Direct Axis Synchronous): 283 % – 177 % depending on connection
    • X’d (Transient): 22.2 % – 13.9 %
    • X’’d (Subtransient): 7.8 % – 4.9 %
    • Xq (Quadrature Axis): 162 % – 101 %
    • T’do (Open Circuit Field Time Constant): 188 ms
    • T’d (Transient Time Constant): 14 ms
    • T’’d (Sub-Transient Time Constant): 9 ms

  • Mechanical Specifications:
    • Frame Forms: B2, B3/B14, B3/B9
    • Weight: 236.5 kg (B2) / 238.5 kg (B3/B14)
    • Moment of Inertia: 0.436 kg·m² (B3/B14) / 0.441 – 0.486 kg·m² (SAE 7½ – 11½)
    • Bearings: Drive End – 6309-2RS-C3 / Non-Drive End – 6307-2RS-C3
    • Cooling Method: Self-ventilated air cooling
    • Maximum Overspeed: 2250 rpm

  • Performance and Efficiency:
    • Efficiency (Class H): 85.8 % at 25 % load, 90.0 % at 75 % load, 91.2 % at full load (50 Hz)
    • Efficiency (Class H): 86.2 % at 25 % load, 92.0 % at full load (60 Hz)
    • Voltage Dip (Transient Load Step): < 25 % with recovery time < 0.5 s
    • Stable voltage and frequency across variable loads

  • Environmental and Operational Conditions:
    • Ambient Temperature: 40 °C
    • Altitude Derating: Power derating above 1000 m
    • Insulation Class: H (125 °C rise)
    • Protection Degree: IP23
    • Compliance with EN vibration and balance standards

  • Certifications and Compliance:
    • Standards: EN60034-1, ISO 8528-3, EN55011
    • Optional Certifications: UL 1446, CSA-C22.2 No. 100, UL1004-1, UL1004-4

Datasheet

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