The assess reduction of the expected energy not-supplied to consumers in medium voltage distribution systems after installing a sectionalizer in optimal place

Abstract

The article discusses the selection of the installation place for sectionalizers in power lines of medium voltage distribution system. Considered are sectionalizers which automatically disconnect the section of the power line during a pause after the second unsuccessful reclose of the main circuit breaker. Two types of medium voltage distribution systems are considered: systems which have only one power source and one main circuit breaker; systems which can automatically load transfer to the alternate power source and have secondary circuit breaker switched-off in normal condition. To calculate the reduction value of the expected energy not-supplied to the consumers after installing sectionalizer the authors propose a simplified method based on replacing discrete loads along the trunk-line with the proposed typical functions. This allows to avoid complicated discrete optimization methods. Using this method, the table values of optimum placement of sectionalizer and the expected energy not-supplied to the consumers are obtained. This approach is preferable for Distribution System Operators because method requires only classifying the power line and using the table value.