Improvement of microprocessor voltage control relay operation algorithms for single-phase household consumers

This paper pays attention to a single-phase voltage control relays work algorithms that are used for protection of the household consumers of electrical energy from unacceptable voltage deviations within power supply network. An overview, analysis and description of operation algorithms, voltage measurements and thresholds of current voltage control relays, based on microprocessors and microcontrollers have been carried out. The conducted overview and analysis systematizes information on the technical and functional features of the operational design, work algorithms, circuits and components of the mentioned relays and demonstrates the prospects for development of voltage relay operational algorithms and protective characteristics according to existing International standards. The protective characteristics and standards of power quality have been outlined and illustrated by the authors in detail. The voltage measuring and digital signal processing (signal filtering) algorithms in modified voltage relay are described as well. Also represented a novel approach in design of operation algorithms taking into account of positive sides in existing voltage control relays and new sintesed algorithms including concept of voltage measurement and decision making algorithms for a new single-phase voltage control relays for household consumers. A generalization and conclusion are made concerning the improved operation algorithm in the voltage control relay for protection of household consumers.