Power transformer tapping switch tap selector - has contact bridge housing fixed to inner driving tube via arcuate shoulder pieces for torsional strength

摘要

The power transformer tapping switch tap selector comprises a fixed selection column that carries two contact rings per phase arranged in different planes. The contact rings are connected to conductors arranged inside the selection column. The selector is designed for great strength and rigidity, partic. for torsional strength of the concentric driving tubes. The contact bridge housing carried by the inner driving tube is fixed to the latter by means of an upper and a lower (relative to the contact bridge) arcuate shoulder-piece matched to the dia. of the tube. Both arcuate shoulder - pieces as well as the contact bridge stick out through special slots provided in the outer driving tube and running around the latter's periphery.