Melnychuk S. Methods and tools for determining broken conductor protection in distributed networks

Object of investigation - broken conductor modes of distributed power networks. The aim - increasing of the sensitivity and selectivity detection of inadmissible broken conductor in distributed power networks by the using of new information parameters relay protection. Methods are based on the theories of power engineering, relay protection, Boolean algebra, the methods of mathematical modeling. Work was done relying on fundamental assumptions of relay protection information theory. Theoretical results: protection method of distributed power networks from broken conductor modes conductivity for individual phases and phase characteristics form the relay conductivity was proved for the first time; protection method of distributed power networks from broken conductor modes in the direction of zero sequence power was improved by using the comparison areas pulsing zero sequence power circles in the transmission line and transformer, which provides increased selectivity of detection of damaged transmission lines; the mentioned method for reverse and direct sequence of currents towards its addition increases the ratio of currents in emergency mode was developed, providing increased sensitivity protection. Practical results - created: an algorithm that is designed to detect broken conductor mode, the operation of which is assigned using conductivity phase and zero sequence pulsating power that can increase the sensitivity and selectivity of relay protection; methodology and calculation of sensitivity settings of protection for measuring conductivity phase, which allows using of options to choose operation developed device; device to detect asymmetric mode, which allows to be used in inadmissible detection broken conductor mode, which eliminates the possibility of overloading power transformer windings for high voltage and neutral; damage to high-voltage switches with a deterioration in the chamber as a contact switch; occurrence over a neutral ungrounded power transformers; excess of power protection with off circle intact and thus reduce the losses from false positives overhead transmission line protection in distribution power networks and to prevent damage to equipment users. The implementation - results of investigation are introduced in the Southwest Power System of State Enterprise "NPC "UKRENERGO", LLC" Podolsky Energy consulting" and learning process of Vinnytsia National Technical University. Sphere (industry) of use - relay protection of power transmission lines.