Medium Voltage

Range from 1000 to 5999 V

Medium Voltage AC Generators

Medium Voltage AC GeneratorsKato Engineering medium voltage generaors range from 1000 - 5999 V.

The specially designed insulation system used on Kato generators guarantees high opposition to chemicals and moisture in hostile environments, and long generator life.

We offer the following specifications:

Power Rating  500-2500kW 4 Pole,  500-3000 kW 6 Pole,  500-5000 kW 8 Pole,  500-4500 kW 10 Pole
Frequency 60 Hz or 50 Hz, 3 Phase
Speed @ 50/60 Hz 1500/1800 RPM,  1000/1200 RPM,  750/900 RPM,  600/720 RPM
Efficiency  88% to 97% depending on kW rating, operating speed, and voltage
Rotor & Stator Insulation Class F or Class H with 100% solids epoxy resin vacuum-pressure impregnation (VPI)

Enclosures: Open drip proof is standard, with the following options available:

  • Standards & Certifications
    Kato Engineering designs power generation systems that can comply with numerous international standards (ISO, IEEE, MIL-STD, NEMA…) and meet/exceed industry standards for performance, reliability, maintainability and compactness. With each proposal, we quote specific requirements for your application needs.
  • Construction Features

    Stator Construction

    Stators: From the lamination steel to the frame material to the windings, Kato Engineering's stators are precisely designed and constructed to ensure peak generator performance and operating life. 

    Frames: Sophisticated design software and over 75 years of experience ensure that the generator frame is made with strength and support where needed instead of just adding useless size and weight. Stator frames are welded with heavy rings and bar steel. The frame is reinforced with welding plates between bars or with a heavy wrapper. Heavy gauge steel is formed and fasted to the frame to provide an ample airflow path. The endrings are precisely machined to support the bearing brackets.

    Form-wound windings: Because of the high voltages they incur and their importance to generator performance and life, the stator coils are the heart of a generator. Kato Engineering uses modern and precise equipment to make these coils. Insulating tapes are precisely layered to ensure maximum insulation properties and optimum fit in the coil slot, eliminating discharges that would shorten the generator's operating life.

    In the stator, coil end windings are supported with surge ropes and blocking material to withstand short-circuit fault conditions. Entire stator assemblies are immersed into liquid epoxy resin and vacuum-pressure impregnated. The vacuum exhausts air and moisture from the windings and permits complete penetration of the epoxy resin during the pressure cycle, filling voids and creating a rigid mass with optimum dielectric strength.

    Random-wound windings: Random windings are used for selected applications under 1000 volts and for high frequency generators. The windings are made with the highest quality round copper wire, which has a heavy film coating rated at 200° C. The windings are fully impregnated with resin.  

    Rotor Construction

    Rotors: For long, smooth operation Kato Engineering rotors are precisely made with the highest quality components. State-of-the art equipment ensures the most stringent manufacturing requirements are met.

    Rotor pole shape is designed to withstand mechanical stresses caused by rotational forces and prime mover pulsations. The pole contour is optimized to minimize harmonics in the voltage waveform.

    Field coils are machine wound on the poles with high temperature rated insulated copper wires. The coil end and interpolar region are blocked to prevent coil movement and distortion. Depending upon the application, damper bars are inserted into the pole face and brazed or welded at each end to complete the damper/amortisseur winding. The purpose of the damper windings is to reduce the generator harmonics and absorb torque pulsations caused by the prime mover or an unbalanced load distribution. The damper windings also reduce system oscillations caused during parallel operation. The rotor is either vacuum-pressure impregnated or wet wound.

    The shaft is precision machined to meet the stringent tolerance requirements for runout and concentricity of the shaft bearing surfaces. The rotor is dynamically balanced to meet specifications.

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