Fault location method development at lines with trilateral feed

Abstract

Algorithms for automatic detection of the location of short circuits on overhead lines with a different number of power sources are proposed. The algorithms use the full values and the symmetrical components of the mode parameters from all sides of the line. If necessary, the replacement circuit of the line to the scheme of two-sided power is performed by equivalencies the parameters. The calculation in accordance with the method based on the use of the parameters of the direct sequence equivalent circuit and the constituent parameters of the direct sequence mode does not depend on the type of short circuit (SC). In the method based on the principle of remote relay protection, calculations are performed depending on the type of short circuit. For the technical implementation of automatic fault location, Regina recorders are used, which are installed at the hub substations. Synchronization of measurement parameters of the mode is performed by the GPS signal. The necessary information about the mode parameters from different sides of the line is transmitted to the server, which calculates the distance to the point of damage. Analysis of the accuracy of determining the location of damage is made on the basis of information about the real damage to the air lines. The assessment of the influence of the main factors on the accuracy of determining the location of damage.