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Alternator PRO18S A/4

Linz Electric PRO18S A/4 Alternator – 20 kVA Three-Phase Brushless Alternator with AVR

The PRO18S A/4 alternator from Linz Electric is a three-phase, 4-pole, brushless synchronous alternator designed for industrial generator applications. Delivering 20 kVA at 50 Hz and 24 kVA at 60 Hz, it provides stable and clean power with AVR voltage regulation, low distortion (<3% THD), and high efficiency. Built with Class H insulation, IP23 protection, and a durable self-excited excitation system, the PRO18S A/4 is engineered for long-lasting reliability in demanding environments.

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Alternator Model

PRO18S A/4

50Hz (kVA)

20

60Hz (kVA)

24
Control Systemself-excited
A.V.R.HVR11-HVR30
Voltage Regulation± 1 %
Sustained Short Circuit> 250 % of rated current
Rated Power Factor0.8

  • General Characteristics:

    The Linz Electric PRO18S A/4 is a compact, brushless, self-excited, three-phase synchronous alternator developed for small-to-medium industrial generator sets. It utilizes an AVR-based regulation system (HVR11 or HVR30) ensuring ±1% voltage stability. Designed to operate at 1500 rpm (50 Hz) or 1800 rpm (60 Hz), the alternator complies with EN60034-1, ISO 8528-3, and EN55011 standards for electrical performance and EMC.

  • Electrical Specifications:

    • Rated Power: 20 kVA (50 Hz) / 24 kVA (60 Hz)

    • Voltage Range (Star Connection): 380–480 V

    • Frequency: 50 / 60 Hz

    • Power Factor: 0.8

    • Efficiency (Class H): up to 89% depending on load

    • Total Harmonic Distortion (THD): <3%

    • Voltage Regulation: ±1%

    • Sustained Short-Circuit Current: >250% of rated current

    • Overload Capacity: 110% for 1 hour per 6-hour cycle

    • Required Cooling Airflow: 7–8 m³/min depending on frequency

    • RFI/EMC: Compliant with EN55011

  • Winding and Excitation System:

    • Stator: Double-layer winding with auxiliary (pilot) winding

    • Rotor: Cage-damped winding for dynamic stability

    • Winding Pitch: 2/3

    • Number of Leads: 12 (reconnectable configurations)

    • Stator Resistance: 0.13 Ω at 20°C

    • Rotor Resistance: 6.85 Ω at 20°C

    • Exciter Stator Resistance: 15.0 Ω

    • Exciter Rotor Resistance: 1.87 Ω

    • Excitation Current: 0.82 A (no-load) / 1.80 A (full-load)

  • Reactances & Time Constants (50 Hz):

    • Xd: 325% – 202%

    • X’d: 24% – 15.4%

    • X’’d: 8.4% – 5.2%

    • Xq: 166% – 112%

    • T’do: 236 ms

    • T’d: 15 ms

    • T’’d: 7 ms

  • Mechanical Specifications:

    • Frame Forms: B2, B3/B14, B3/B9

    • Weight: 182–188 kg depending on frame type

    • Moment of Inertia: 0.220–0.250 kg·m²

    • Bearings:

    • Drive End: 6308-2RS-C3

    • Non-Drive End: 6306-2RS-C3

      • Cooling: Self-ventilated airflow

      • Maximum Overspeed: 2250 rpm

  • Performance and Efficiency:

    • Efficiency at 50 Hz:

    • 25% load: ~86%

    • 50% load: ~88%

    • 75% load: ~89%

    • 100% load: 88–89%

      • Efficiency at 60 Hz: up to 90%

      • Transient Voltage Dip (step load): <25% with <0.5 s recovery

      • Very stable voltage waveform due to low THD and 2/3 pitch winding

  • Environmental & Operating Conditions:

    • Rated Ambient Temperature: 40°C

    • Altitude Derating: Above 1000 m

    • Insulation Class: Class H (125°C rise)

    • Protection: IP23

    • Vibration: EN-compliant rotor dynamic balancing

  • Certifications & Compliance:

    • EN60034-1

    • ISO 8528-3

    • EN55011 (EMC)

    • Optional: UL 1446, CSA-C22.2 No.100, UL1004 series

The PRO18S A/4 alternator is designed for applications requiring compact size, low harmonic distortion, stable AVR-controlled voltage, and long-term durability, making it ideal for both stationary and mobile generator systems.

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