High-Performance Carbon Brush Blocks Supplied for Large Hydrogen-Cooled Generator

    Recently, we successfully supplied carbon brush blocks for a large hydrogen-cooled turbine generator, delivering a tailored solution that ensures reliable and stable operation of the power generation unit.

Core Parameters of the Matched Generator

    This hydrogen-cooled generator, manufactured in 1984 by Hitachi, Ltd., Tokyo, Japan, is a key piece of equipment in the power plant. Its core specifications are as follows:

• Type: TFLQQ
• Form: KD
• Phases: 3
• Poles: 2
• Capacity: 245,800 kVA
• Output Power: 221,220 kW
• Rated Speed: 3,000 rpm
• Frequency: 50 Hz
• Rated Voltage: 16,000 V
• Rated Current: 8,870 A
• Exciting Voltage: 440 V
• Field Current: 2,760 A
• Cooling Method: Hydrogen-cooled, hydrogen pressure 210 kpag
• Insulation Class: F
• Ambient Temperature: 45°C
• Temperature Rise of Armature: 55 deg
• Temperature Rise of Field: 65 deg
• Code: ANSI C50.13 (1977)

Parameters of Matched Carbon Brushes and Brush Holder Components

    To match the high-performance requirements of this generator, we provided a complete set of carbon brush and brush holder components with the following precise dimensions:

    The carbon brush (NCC-634) is a critical component in the excitation system. It is designed to maintain stable electrical contact under the high-speed rotation of 3,000 rpm and the high field current of 2,760 A, ensuring efficient transmission of excitation current.

    This carbon brush is a direct, drop-in replacement for the Morgan NCC-634 (also interchangeable with Mersen LFC554). It has been rigorously tested and verified to deliver equivalent, and in some cases superior, electrical transmission performance, including matching resistivity, contact voltage drop, and wear characteristics. It ensures reliable excitation current transfer, even under the demanding high-speed and high-current conditions of this 245,800 kVA hydrogen-cooled generator, providing a cost-effective and high-performance alternative for power plant maintenance and upgrades.

Product Application and Performance Advantages

The carbon brush blocks (NCC-634) supplied are specially engineered for large turbine generators operating in demanding environments. Key advantages include:

• Excellent Electrical Conductivity: Ensures minimal contact resistance and voltage drop, reducing energy loss.
• Superior Wear Resistance: Extends service life and reduces maintenance frequency, even under high-current and high-speed conditions.
• Outstanding Vibration Resistance: Maintains stable contact performance, preventing sparking and premature failure during operation.
• Precise Fit: The dimensions are precisely matched to the original brush holder components, ensuring seamless installation and optimal performance.

    These features are crucial for the long-term, efficient, and safe operation of the 245,800 kVA hydrogen-cooled generator, which plays a vital role in the power plant’s electricity generation capacity.

Physical Image of the Matched Carbon Brush

    We are committed to providing reliable key supporting products for the global power industry, helping generator sets achieve efficient, stable, and long-cycle operation. Our expertise in carbon brush technology ensures that we can deliver solutions that meet the most stringent performance requirements, even for legacy equipment like this 1984 hydrogen-cooled generator.