ABSTRACT
This chapter addresses a problem with the reliability of logic inputs in the digital protective relays (DPR) using the RE 316 series. Problems with the reliability of microprocessor-based protective devices have arisen in connection with the worldwide moving away from electromechanical and static protective relays to. Digital inputs in the DPRs of these types consist of a set of completely identical elements functionally representing the logical function Prohibition. The chapter discusses the problems connected with insufficient reliability of the output miniature electromagnetic relays of DPRs intended for the direct tripping of high-voltage circuit breakers. Some internal soldering joints and additional wire splices by means of the terminal block used in the module can really affect the reliability of relay protection. Depending on the internal protection logic incorporated in the relay, in some cases activating some of logical inputs may cause a false trip of the high-voltage circuit breaker, a high-voltage line, the transformer, or other important power equipment.
