Orders for power transformers that are to be stationed in areas with higher seismic activity, contain a demand for adequate earthquake resistance of the product. This request is acceded, among others, with proper fixation of the transformer's active part in the housing. Seismic waves may cause shifts of the active part inside the housing, thus reducing insulation distances which lead to electric discharge.
The problem was approached by analysing current earthquake supports and the ones used by competition. Taking available technology in the factory into consideration, own innovative solutions were developed. Eurocode 8 standard which regulates design of earthquake resistant structures was adapted to specific structures of transformers and used for calculation of design seismic action. New designs were then evaluated using static and response spectrum analysis.
It was ascertained that the new design of earthquake supports is adequate and can withstand expected loads.