PLC-based adaptive relay protection system implementation

Abstract

The article describes the processes of implementation and experimental testing of the system for adapting the relay protection settings to changes in the network voltage. The adaptation system implemented based on the PLC and a microprocessor current protection device. The article describes the stages of development of a test bench, development of a methodology and testing program, and presents the test results. The purpose of the experimental study: experimental confirmation of the effectiveness of the developed adaptation system of the current protection settings when the voltage fluctuates within the permissible limits. According to the results of experimental studies, the developed adaptation system significantly increases the reliability of operation of relay protection, in case of network faults that occurred at the time of voltage fluctuations within the permissible and maximum permissible limits. The adaptation system prevents non-selective tripping both when the mains voltage drops and when it rises.