Low & Medium Speed Synchronous Generators

Output Range

• 1,000 to 14,000 kW
• 400 to 15,000 Volts
• 50 or 60 Hz
• 500 to 1,200 RPM

Hyundai Ideal Electric Co. low and medium speed salient pole synchronous generators employ proven construction techniques that greatly enhance reliability and service life.

Rotor Construction

The field pole laminations are high strength steel sheet, and are securely riveted under pressure. The field coils are tension wound directly onto the poles, using insulated rectangular copper wire.

The wound poles are attached to the spider by one of two methods, depending upon speed. Low speed generators utilize a fabricated steel spider with bolted-on poles. Medium speed machines employ a laminated spider and dovetail pole attachment.

Aluminum supports are used to secure the field coils under all conditions of operation and the rotor assembly is shrunk and keyed to the shaft. The completed rotor is dynamically balanced to HIEC standards, which are more stringent than those of most U.S. and international standards.

Bearings

Hyundai Ideal Electric Co. low and medium speed generators incorporate split sleeve journal bearings as our standard design, either end-bracket or pedestal mounted.

All bearings are designed for self-lubrication via oil rings, and conservative bearing load limits and peripheral speeds assure cool operation and long life.

Enclosures

Open dripproof enclosure with top air discharge (suitable for most indoor applications) is the most commonly used enclosure for engine-generator set applications.

Filters can be furnished on self-ventilated generators as conditions dictate, and generators can also be arranged for external forced ventilation through ducting.

For severe environments, totally enclosed generators with air-to-water heat exchangers are available.

Our custom engineered design philosophy allows us to meet any unique or specified machine performance requirement (optimizing generator efficiency, designing for special reactances, or minimizing waveform deviation and voltage harmonics).

Sealed Insulation System

HIEC’s standard insulation system includes Class F vacuum-pressure impregnation with epoxy resin. The system passes immersion and spray tests per NEMA 1-20.49.
Corona protection is provided as standard for stators above 6000 Volts.

Excitation Systems

Brushless excitation is the most popular choice for synchronous generators. It combines lower cost with performance suitable for nearly all applications, and eliminates the problems of brush wear and maintenance.

HIEC’s brushless exciter design combines a high frequency, three-phase out with full wave rectification, which assures minimum ripple current and faster response. The rectifiers are mounted on a copper heat sink, and redundant fused rectifiers can be furnished for critical applications.

A permanent magnetic pilot exciter can be furnished as an integral part of the exciter, for use as a power supply to the voltage regulator. The use of a permanent magnetic pilot exciter in place of a power transformer allows black start capability and forcing current under short-circuit conditions.

Voltage Regulators

HIEC furnishes a state-of-the-art digital electronic voltage regulator as part of our package. Features such as VAR/Power Factor control, excitation limiting and motor operated control are also available.

• HIEC manufactures generators to meet all current industry standards, including IEEE, ANSI, NEMA, API and IEC. Special certification is available through CSA, ABS, DNV, Lloyds and others upon specification.
• HIEC routinely designs motors for hazardous operation in Division 2 / Zone 2 environments with CENELEC / ATEX certification available.