New solutions for carrying out high voltage fuses for the protection of grids containing power transformers

This article presents the result of the research carried out for the modernization of the constructive solutions for classic current limiting fuses defined in IEC 60282-1 /2009 used for the protection of electric circuits pertaining to the distribution of electric energy. The modernization of the current limiting fuses, without silver and copper consumption, for the protection of high voltage electric circuits pertaining to the distribution of electric energy is based on the patent application: A/00131 of 07-02-2013 “Replacement elements for current limiting fuses”. The modernization consists in increasing the efficiency of the construction of high voltage current limiting fuses by completely eliminating scarce silver and copper materials consumption and replacing them with electrochemically protected electrotechnical aluminum, without diminishing the technical performance of the products. At the same time, by using the composite-silicone insulation, the power consuming components, namely the support insulators of replacement elements caps will be eliminated. By using the composite-silicone insulation for the support insulators with a leakage path that is higher in comparison to the existing insulators of the current replacement elements caps, a safe operation in severe environment conditions is provided, in accordance with IEC 60282-1 /5.16/.