Earthing brushes
Shaft earthing through earthing brushes
Shaft Turbomachinery Solutions Europe supplies high performance and highly reliable SOHRE bristle fiber earthing brushes for use in shaft earthing of all types of stray electrical currents.
The brushes can also be used for the transmission of instrument signals and for online diagnostics of generators or electric motors. SOHRE has continuously improved the earthing brushes and incorporated decades of experience.
The best earthing brushes for your application needs
The optimum protection for all bearings and shafts
No soiling due to wear of the earthing brush
Long duration of action
Brush models
In general, type L and type S earthing brushes are suitable for mechanical drive units and small turbine generators.
Type LW earthing brushes are suitable for systems in power plant control centers with an output of 100 MW to over 1,000 MW.
The type A earthing brush is particularly suitable for axial installation against a shaft end or the shaft collar, even for retrofitting during operation.
Of the smaller brushes, the type L dissipates around four times as much current as the type S with the same wear rate of the bristles. For this reason, the type L brush is the most economical of the small brushes and therefore has the longest replacement interval for bristle elements.
Our replacement brushes
Brush models
We distribute high-quality patented earthing brushes from Sohre and the corresponding replacement brushes throughout Europe. Type A earthing brushes are particularly suitable for axial installation against a shaft end or the shaft collar, even for retrofitting during operation. Type L and type S earthing brushes are generally suitable for mechanical drive units and small turbine generators.
Installation
Type A earthing brushes are primarily designed for retrofitting on site, even during operation (usually at the end of the shaft) and for axial or radial positioning. Type L, LW and S earthing brushes can be installed in almost any position in relation to the shaft. Please also note the typical mounting locations.
Installation diagram
Here you will find basic instructions for the installation of type L, LW and S earthing brushes with regard to the shaft, seal, flange and housing. Please also refer to the drawings if you wish to install type A earthing brushes.
Typical installation locations
Our earthing brushes are designed to allow them to be installed in a wide variety of locations and positions on the machine.
Examples for the installation
Type L earthing brush for turbine generator service … Visual inspection of the internal brush cartridge after removal. Area of application of a type L earthing brush in the turbine generator … Note: The type of brush mounting flange shown is not standardized but is available from us as an option. Please make sure to specify this when ordering.
Security
It is important to observe and follow basic safety precautions when operating a grounding brush in high speed environments, confined spaces or chemically aggressive atmospheres. The precautions and procedures required will depend on the specific application. While Sohre Turbomachinery® has made every effort in the design of our grounding brushes to accommodate a wide variety of applications adapted to the particular industry or operating conditions...
Shaft currents are a dangerous problem for many turbomachines
Shaft currents are caused by the build-up of electrical charges on the machine shaft and can lead to expensive damage and breakdowns. That's why it's important to have the right protection against this!