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The Possibility of Recognizing Electrically Remote Fault in the Multidimensional Space of Information Signs

The article talks about the problem of remote backup protection of branching substations with low-power transformers, in particular, about a promising direction of its solution as the creation of multiparameter relay protection devices. A brief description of the problem is given, and a list of information signs available to the relay protection devices for solving it is given. A dimensionless criterion is proposed that makes it possible to assess the possibility of separating normal and fault regimes of operation by controlling a list of signs. Comparison of the signs under consideration was performed according to the proposed criterion in the case of the presence of a single power source (a radial electrical network) in the electrical network. The conclusion is made about the prospects of using the control of the increments of orthogonal direct current components, voltage changes and the position of switching devices of branch substations in the development of new multiparameter relay protection devices that are characterized by increased sensitivity to remote short circuits in radial electrical networks.