Frequency generator

synchronousvoltageair-cooled

Overview
BRUSH™ Power Generation 4-pole, air-cooled synchronous generators are engineered for turbine drive (gas or steam) with typical outputs from 10 to 55 MVA (@40°C), and an overall range of 3–55 MVA. Proven in over 750 active installations, these units are specified for geothermal, public utility, cogeneration (CHP), industrial and offshore power applications.

Stator
The stator frame is a rigid mild-steel structure designed to withstand operational and short-circuit mechanical stresses. The core uses segmented low-loss, high-silicon electrical steel laminations with radial ventilation ducts. The two-layer diamond stator winding uses identical diamond-wound coils with six winding ends (three line, three neutral). Insulation is Class F (glass fabric and mica tape) with full vacuum pressure impregnation (VPI) and oven curing for long-term dielectric stability.

Rotor
Rotors are produced from a one-piece alloy-steel forging, de-gassed, vacuum-poured and stress-relieved to ensure uniform material properties. The rotor winding comprises four copper-strip coils, brazed and insulated with aramid paper and epoxy, consolidated under high pressure and temperature. Coils are series-connected to the brushless exciter DC output via flexible links and retained by forged steel pole shoes. All rotors undergo comprehensive factory testing, including overspeed tests.

Benefits

• High electrical efficiency (up to 98.6%)
• Optimised for turbine-driven applications (typical 10–55 MVA @40°C)
• Modular, factory-tested units to reduce on-site commissioning time

Features

• One-piece alloy-steel rotor forging for extended service life (design life ~25 years)
• Modular construction adaptable to different turbine interfaces
• Comprehensive factory tests to minimise site work

Applications

• Geothermal generation
• Cogeneration / CHP plants
• Public utility power stations
• Industrial power generation
• Offshore power installations

Specifications
Voltage: Up to 15 kV
Excitation: Brushless or static
Insulation: Class F
Frequency: 50 or 60 Hz
Output: 3 to 55 MVA (@40°C)
Drive: Single or double-end drive
Driver types: Aeroderivative gas turbine; Frame gas turbine; Steam turbine
Design standards: IEC & IEEE compliant

Options

• Low-temperature operation
• Low-noise solutions
• Lightweight variants
• Hazardous area configurations
• Multiple heat-exchanger choices
• Double-end drive
• High-inertia variants
• API 546 compliant designs
• Harsh-environment configurations
• Synchronous compensator capable variants

Technical specifications

• Voltage: Up to 15 kV
• Output range: 3 to 55 MVA (@40°C) (typical turbine-driven 10–55 MVA)
• Frequency: 50 Hz or 60 Hz
• Insulation class: F (glass fabric, mica tape, VPI and oven cure)
• Excitation: Brushless or static
• Rotor construction: One-piece alloy-steel forging (de-gassed, vacuum poured, stress relieved)
• Stator winding: Two-layer diamond winding with six winding ends (3 line, 3 neutral)
• Cooling: Air-cooled (4-pole)
• Drive: Single or double-end; compatible with aeroderivative/frame gas turbines and steam turbines
• Standards: IEC & IEEE compliant
• Factory testing: Comprehensive tests including overspeed