Frequency generator

voltageair-cooledlow-noise

Overview
BRUSH Power Generation 2-pole DAX air-cooled generators are designed for steam and gas turbine drives, delivering continuous power from 20 to 310 MVA. Available in BDAX (brushless excitation) and YDAX (brushed/static excitation) variants, these units have more than 3,500 active installations and are specified by industrial operators, EPCs and power plant owners for turbine-driven generation and synchronous compensator applications.

Stator
The stator frame is engineered to withstand mechanical stresses under fault conditions. Windings use resin-rich mica glass tape insulation, providing Class F thermal performance for high-temperature operation.

Rotor
The rotor is a one-piece forging from degassed nickel-chromium-molybdenum alloy for superior tensile strength. Rotor conductors are high-conductivity copper/silver alloy strip with Class F insulation. End-windings are secured by retaining rings made from austenitic non-magnetic 18-18 manganese-chromium steel.

Excitation
Brushless excitation employs a three-phase rotating armature AC exciter with a shaft-mounted fused rotating rectifier. Static excitation routes power from the generator through step-up/auxiliary transformers and a controlled rectifier to the main field via slip rings.

Specifications
Voltage: Up to 20 kV
Excitation: Brushless or static
Insulation: Class F
Frequency: 50 or 60 Hz
Output: 20 to 310 MVA
Drive: Single- or double-end drive
Driver:

• Aeroderivative gas turbine
• Heavy-frame gas turbine
• Steam turbine (including geothermal)
• Turboexpander

Design standards: IEC, IEEE, CSA, ATEX, IECEx, ABS, DNV and Lloyds compliant.

Options

• Low-temperature operation
• Low noise
• Lightweight construction
• Hazardous area operation
• Multiple heat exchanger options
• Double-end drive
• High inertia variants
• Low inertia variants
• Harsh environment configurations
• Capable of synchronous compensator operation

Features / Technical specifications

• Model series: DAX
• Power output range: 20 to 310 MVA
• Maximum voltage: Up to 20 kV
• Available frequencies: 50 Hz or 60 Hz
• Insulation class: F
• Excitation types: Brushless (rotating rectifier) or static (controlled rectifier with slip rings)
• Rotor material: One-piece forging of degassed nickel-chromium-molybdenum
• Rotor conductor: High-conductivity copper/silver alloy strip
• End-winding retainers: Austenitic non-magnetic 18-18 manganese-chromium steel
• Drive options: Single or double-end; suitable drivers include aeroderivative and heavy-frame gas turbines, steam turbines (including geothermal), and turboexpanders
• Compliance: IEC, IEEE, CSA, ATEX, IECEx, ABS, DNV, Lloyds