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Alternator PRO18S B/4

Linz Electric PRO18S B/4 Alternator – 25 kVA Three-Phase Brushless Alternator with AVR

The PRO18S B/4 alternator from Linz Electric is a three-phase, 4-pole, brushless synchronous alternator designed for industrial generator sets. Delivering 25 kVA at 50 Hz and 30 kVA at 60 Hz, it combines strong electrical performance, AVR-controlled voltage stability, and low harmonic distortion (<3% THD). With Class H insulation, IP23 protection, and a highly durable excitation system, the PRO18S B/4 ensures reliable, long-life power generation for both stationary and mobile applications.

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Alternator Model

PRO18S B/4

50Hz (kVA)

25

60Hz (kVA)

30
Control Systemself-excited
A.V.R.HVR11-HVR30
Voltage Regulation± 1 %
Sustained Short Circuit> 300 % of rated current
Rated Power Factor0.8

  • General Characteristics:

    The Linz Electric PRO18S B/4 is a 4-pole, brushless, self-excited synchronous alternator designed for heavy-duty generator applications. It uses an AVR system (HVR11 or HVR30) ensuring ±1% voltage regulation accuracy. Rated for operation at 1500 rpm (50 Hz) and 1800 rpm (60 Hz), the alternator complies with EN60034-1, ISO 8528-3, and EN55011 standards.

  • Electrical Specifications:

    • Rated Power: 25 kVA (50 Hz) / 30 kVA (60 Hz)

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

    • Power Factor: 0.8

    • Frequency: 50 / 60 Hz

    • Efficiency (Class H): up to 90% depending on load

    • Total Harmonic Distortion (THD): <3%

    • Voltage Regulation Accuracy: ±1%

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

    • Overload Capability: 110% for 1 hour every 6 hours

    • RFI/EMC: Fully compliant with EN55011

    • Cooling Airflow Requirement: 8–9 m³/min

  • Winding & Excitation System:

    • Stator: Double-layer winding with auxiliary winding

    • Rotor: Winding with damping cage for stability

    • Winding Pitch: 2/3

    • Leads: 12 (reconnectable)

    • Stator Resistance: 0.10 Ω @ 20°C

    • Rotor Resistance: 6.15 Ω @ 20°C

    • Exciter Stator Resistance: 15.0 Ω

    • Exciter Rotor Resistance: 1.87 Ω

    • Excitation Current: 0.85 A (no-load) / 1.92 A (full load)

  • Reactances & Time Constants (50 Hz):

    • Xd: 305% – 188%

    • X’d: 23.2% – 14.4%

    • X’’d: 7.9% – 4.9%

    • Xq: 156% – 107%

    • T’do: 215 ms

    • T’d: 14 ms

    • T’’d: 7 ms

  • Mechanical Specifications:

    • Frame Forms Available: B2, B3/B14, B3/B9

    • Weight: 190–198 kg depending on frame selection

    • Moment of Inertia: 0.240–0.275 kg·m²

    • Bearings:

    • Drive End: 6308-2RS-C3

    • Non-Drive End: 6306-2RS-C3

      • Cooling: Self-ventilated airflow

      • Maximum Overspeed: 2250 rpm

  • Performance & Efficiency:

    • Efficiency at 50 Hz:

    • 25% load: ~86%

    • 50% load: ~89%

    • 75% load: ~90%

    • Full load: ~90%

      • Efficiency at 60 Hz: Up to 91% at full load

      • Transient Load Response: <25% voltage dip with <0.5 s recovery

      • Excellent waveform stability due to 2/3 pitch winding

  • Environmental & Operational Conditions:

    • Rated Ambient Temperature: 40°C

    • Altitude Derating: Above 1000 m

    • Insulation Class: Class H

    • Protection Class: IP23

    • Vibration and mechanical balance compliant with EN standards

  • Certifications:

    • EN60034-1

    • ISO 8528-3

    • EN55011

    • Optional UL/CSA certification packages

Datasheet

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