Development and Research of Methods for Selection of Sets of Measurements of Emergency Mode Parameters and Processing of the Distance Fault Location

The fault location based on fault mode parameters should be performed at such values of current and voltage that will ensure low error of distance to fault location calculation. The classical approach with adjustment from aperiodic current component, used in microprocessor devices, or “manual” selection of current and voltage values, used in software with the fault location function, does not always allow to determine a set of emergency parameter. This does not allow calculating the distance to the fault location with minimum error. This paper is devoted to the development and analysis of the effectiveness of methods for selecting sets of emergency parameter and processing the results of fault location. The efficiency analysis was performed on the basis of a multivariate experiment, in which a short-circuit on a section of the electric network was modelled by varying a number multiple simulation model parameter. The results of the research have demonstrated the most effective approaches to the selection of emergency parameter sets and processing of distanced fault location results. The analysis shows that the most effective approaches are the search of local minimum by the calculated value of increment of resistance in emergency phases, by the corresponding symmetrical components of current and voltage, the search of local minimum of increment of calculated value of distance to the fault location and combined methods. These methods can be implemented in microprocessor-based relay protection devices with fault location function, in emergency events recorder and specialized software for viewing emergency oscillograms with fault location function.