Kutina M. Methods and means of protection against breakage of wires and finding fault location in distribution network with complex topology voltage 6-35 kV

A research object is the processes that occur after break of wire distribution network voltage 6-35 kV overhead power lines and tree topology, the purpose of research is to improve the reliability of the distribution network 6-35 kV with a tree topology of the break of wire and automate the process of determining location damage by measuring the current to reverse the fall of the wires on the ground, as well as the residual voltage after his fall and use location-search methods place a wire break, the theoretical results - the first time a method for protecting a distribution network with complex topology of the wire break, which, unlike from known, provides, in the absence of blocking of protection against phase to phase short circuit measurement of negative sequence current and with exposure of time of wire falling on the ground, measure the residual voltage and compared with the calculated values. In case of exceeding the setting operation of protection proposed action on the disconnection, which improves the sensitivity of the protection and the excludes an unspecified denial , the first time a mathematical model of falling wires, which, in contrast to the known considers parameters of the distribution network are taken into account, the characteristics of the soil and the environment, which allows to determine the time of the fall to the ground wire and the resistance in the wires falling to the ground and increase the accuracy of calculating the parameters of operation of protection, improved method for determining the location of the break wire overhead distribution network with a tree topology by the use of direct and inverse Fourier transform to compare waveforms obtained after tripping relay protection previously registered a pulse sensing, reducing operating costs and time determination fault location. Practical results- for real distribution networks obtained by simulation: the dependence of the negative sequence current at the beginning according to the place of breakage off phase wire on the line and branches, as well as the location of the break until its fall to the ground, the dependence of the residual voltage of the place broken wire after falling to the ground, to evaluate the contact resistance in the wires fall. A device for protection against wire break on the microelectronic element and microprocessor bases, which increases the operational reliability of the distribution network, provides a system for determining the location of the break locating pulse sensing based reflectometer REIS-105R. A program to decrypt reflektogramy extensive network based on the difference method. The degree of implementation - the results have been implemented in PAT "Vinnitsaoblenergo" (the act of 04/04/2012), and the learning process of Vinnytsia National Technical University. Scope of - power engineering.