Abstract
The paper proposes to consider the principle of operation of alternative protections of power transformers against external and internal short circuits, having the effect of resource-saving materials used. The purpose of the work is to build the protection of power transformers made on a different element base and without the use of measuring current transformers (CT) with metal cores. The protections made with the use of inductive coils, which in current protections are a perceiving and an executive body, are presented for consideration. Protections with their use can be used as an alternative to conventional protections of electrical installations with the above-mentioned measures current transformers. The main result is the consideration of the following transformer protections: maximum current protection, longitudinal differential protection and gas protection. It should be noted that protections using inductance coils represent a new approach to the realization of relay protection. They are characterized by simplicity of execution, minimum consumables, convenience of operation, without the use of current and gas relays, current and voltage transformers with metal cores, which contain expensive steel, copper, high-voltage insulation and have significant weight and dimensional parameters, which meets the urgent problem of the electric power industry - resource saving.