Power Generation

The heart of a power generation plant is the turbine-generator. It is critical that this large, expensive machinery operates reliably and with as little downtime and maintenance as possible. The excitation current for the generators is transferred to steel collector rings by means of a sliding electrical contact utilizing carbon brushes. The sliding contact speeds on these turbo-alternators are some of the highest for any carbon brush application in industry, with speeds up to 16,000 feet per minute or 81 meters per second. National Electrical Carbon grade 634 is a world renowned graphite grade that is the preferred grade specified by turbine generator original equipment manufactures and power plants around the globe. Originally established in the 1930s, National grade 634 performance has made this an enduring product in the electrical generation industry. The low friction, consistent contact drop and good brush life make grade 634 a superior product, but even more important, grade 634 is gentle to collector rings, minimizing the need for collector ring maintenance. To maximize performance of your turbine generators, specify National grade 634 carbon brushes

Grade 634

  •  World renowned graphite grade designed for use on high speed collector rings
  •  Leading material in the power gen industry for over 60 years
  •  OEM grade of choice
  •  Friendly to slip rings
  •  Designed for speeds of up to 16,000 ft/min.
  •  Low friction
  •  Low contact drop
Power Generation
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