Аңдатпа
The problem of eliminating the use of expensive and metal-intensive current transformers has been recognised by the worldwide CIGRE committee as a strategic challenge for the power industry. However, almost all conventional current protections receive information from current transformers. In this paper, resource-saving protections based on photocells, thermistors and photodiodes and without current transformers are proposed for consideration. These protections can be used as an alternative to traditional current protections for 10 kV electrical installations connected to a cell of a complete switchgear. The presented protections are made according to the developed new method. The results of the work can be used at large and small industrial enterprises, power plants and substations of stations, as well as interesting to the scientific community, as they help to solve the actual problem of electric power industry-resource saving of used materials, including in relay protection. The purpose of this work is to develop a method for constructing overcurrent protection for 10 kV electrical installations connected to switchgear cells and to create overcurrent protection devices that can serve as an alternative to traditional current protections with current transformers and current relays with metal cores, while saving the materials used.