Brake pads in transformer tap changer motor units
Description
A tap changer is a mechanism in grid transformers which allows for variable turn ratios to be selected in steps. Access points, known as taps, are connected along either the primary or secondary winding, to create the correct voltage output.
This provides the ability to control the input voltage rating of the transformer at the point of power consumption and makes it easier to regulate the voltage output when, for example: there are consumption surges within a grid.
These mechanical systems incorporate a braking system for the drive motor. Brake pads/shoes are used, which provides a risk for asbestos in older friction materials previously installed in older braking systems.
Brands/products
No brand identified
Years of production/use
Prior to 1990
Residential uses
n/a
Industrial uses
- Power stations and sub-stations
- Wherever older significant power infrastructure is installed
Be aware
Residue and dust in immediate vicinity, particularly in enclosed units, is likely to contain respirable asbestos fibres.
Brake shoes in this application do not receive continual use – useable life expectancy can be extended for decades if in lesser used break assemblies, which provides a risk of ACM in friction materials installed prior to 2003. Images were taken in 2018-19 of units installed in 1980s.
