On-Load Tap-Changer with Surge Arresters
Publicerad
Författare
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Hitachi Energy are advancing the world’s energy systems to be more sustainable,
flexible and secure by offering solutions for distributing electricity over large distances.
A key component in the electrical grid are transformers and their transformation
of electrical energy between voltage levels. An important component of the
transformer is the On-Load Tap-Changer (OLTC). It makes it possible to ensure
a sufficiently stable voltage level on the power grid, by alternating the number of
turns in the transformer winding. Quality assurance and safety is of essence since
transformer failures can have huge consequences, therefore a safety device so-called
surge arrester can be used to protect the OLTC from over-voltages from the grid
that may occur and direct them to ground.
However, another tap-changer model in Hitachi Energy’s product range lacks this
feature due to space limitations within the tap-changer compartment. The aim with
this thesis is to make a concept design with surge arresters for the model that does
not have this feature yet.
During the project, a problem definition was stated and a prestudy performed in
combination with the establishment of a requirements specification to find a solution
to the problem. An iterative process of concept generation, design reviews and
concept selection methods was done to end up with a final design. The final design
was then 3D-printed to demonstrate the solution.
The final design consists of three holders that holds the surge arresters in place, the
surge arresters has been modified with a groove and new connectors that connects
the surge arresters electrically through connection plates to the diverter switch. This
concept fulfils all requirements and wishes that has been possible to evaluate during
the thesis and serves as a foundation for future work for Hitachi Energy.