RO102829A2 - Plug switch for adjustment, when tension is absent, at dry type - Google Patents

Abstract

Socket switch for the control of dry transformers, in the absence of voltage, applicable in case of transformer windings with star connection, neutral brought out, in accordance with the main invention of the patent no. 92128, with electrical contact set up gradually, by slow compression of a spring, caused by screwing of a metal bar, and with remote control of the transformer connection initiated by the forward progress of the same bar toward the end of the stroke. The fixed contacts of each phase are mounted on a unique insulated supporting plate. Each fixed contact has a hole to guide the subassembly with mobile contact to the right position. The subassembly is pressed toward the contact position by a rigid disc, part of a rotating mechanical subassembly, whose gradual screwing into a threaded bushing causes the forward progress of the axle of this subassembly toward the plate with the fixed contacts and toward the disc. At the end of the forward movement of the axle, the contact is achieved for the remote command of the connection of the transformer, by the superposition of the contact pellet fixed to the axle but insulated electrically from it, over two rigid conducting bands, which are part of the remote control circuit of the transformer.