A SOLID STATE ELECTRONIC DEVICE FOR CONTROLLING AND INDICATING OVER VOLTAGE ON THE SECONDARY/TERMINALS OF A CURRENT/WINDING TRANSFORMER

摘要

A solid state electronic device for controlling and indicating over voltage on the secondary winding terminals of a current transformer, said device comprising a solid switch or semi-conductor switch having atleast one main contact, a pulse smoothening and stabilising network and at least one annunicator circuit, the input terminals of said switch being connectable to the secondary winding terminals of said transformer and the output terminals of said switch being connected to the input terminals of said network, the input terminals of said annuniciator circuit being connected to the output terminals, if any, of said network or being connectable to the secondary winding terminals of said transformer or being connected to auxiliary contact, if any provided in said switch and to a power supply source, and power supply source being different from the secondary winding terminals of said transformer, said switch being such that when the voltage across the secondary winding terminals of said transformer exceeds a preset level, said main contact and said auxiliary contact, if any, close and said switch starts conducting, said annunciator circuit being operable when the voltage across the secondary winding terminals of said transformer exceeds said preset level and said switch starts conducting.