ABSTRACT
Philosophy beginning with the ancient Greeks is literally "a love of wisdom" and deals with the most general issues of reality. In the course of reformation of electric power sector, the philosophy of relay protection (RP) and automatics, where mostly electro-mechanical and microelectronic devices produced by Cheboksary Electric Apparatus Plant have been used. A system of RP is an aggregate of related devices, which ensure detection of the emergency mode in the operation of electric equipment and its elimination. Significant qualitative changes have happened in the field of RP. Single-function electromechanical protection relays have been replaced by multifunctional digital protective relays (DPRs) with much higher qualitative characteristics and easily programmable logic. The first types of DPR simply copied all the functions and characteristics of the relays of previous generations. Even the very first DPRs, which simply copied the functions of the static solid-state transistor-based relays, revealed serious problems of the DPRs.
