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Toothbrush Type Brushes
Generally speaking, Type-L and Type-S brushes are suitable for mechanical drive equipment and small turbine-generators. Type-LW brushes are meant for central station power plants with units having labeled ratings of 100 MW to more than 1,000 MW. Of the smaller brushes, the Type-L will carry about four times as much current as a Type-S for the same bristle “burn-off” rate. For this reason, the Type-L is the most economical of the small brushes in terms of ampere-hours per dollar and has the longest bristle element replacement interval of them.
Large, narrow shaft-grounding brushes for use inside the frames of turbomachines in process industries, such as air and gas compressors, turbines, pumps, and motors subject to electrostatic-, electromagnetic-, or ground fault-induced stray currents. These brushes also are suitable for smaller turbine-generators and electric motors. They are designed for up to 50 MW per brush, or up to 4 A DC continuous for one year of bristle element life.
Large, wide shaft-grounding brushes that offer extremely low contact resistance and long life expectancy. Designed for high-current applications (≤100 A), Type-LW brushes are recommended for large turbine-generator rotor shafts as well as for ship propeller shafts and large turbine-generator rotor shafts. Designed for up to 500 MW per brush or up to 100 A DC continuous for one year of bristle element life.
Similar to the Type-L, but for small, high-speed turbomachines in process plants where space is extremely limited but currents are relatively low. Because of the smaller size, this brush is consumed faster than the Type-L for any given current rating. Designed for up to 25 MW per brush or up to 1 A DC continuous for one year of bristle element life.
Plunger Type Brush
The Type-A brush is especially suitable for axial installation against a shaft-end or collar. This often is the only accessible location in field retrofits, especially if the brush is to be installed in the end plate of the bearing case while the machine is operating. However, this brush is also well suited for radial shaft contact. They are designed for up to 25 MW per brush or up to 1 A DC continuous for one year of bristle element life.