Development of a method for protecting rural 0.4 kV electrical networks from short circuits using a partitioning device and an algorithm for its implementation

Relevance. Rural 0.4 kV electrical networks are characterized by low protection against emergency currents, especially remote single-phase short circuits, which have values comparable to load currents. The protective devices at the beginning of the power line do not work on these currents. An increase in the protection of the power transmission line from these modes can be achieved through the use of network partitioning devices installed in the dissection of the line. These include devices for sectioning lines with desoldering – multi-contact switching systems. The values of currents and voltages at the point of installation of the sectioning devices differ from the currents and voltages at the beginning of the line in different modes. There are also special features and values of currents and voltages during emergency modes in the desoldering and continuation of the main line. This allows us to create new, more reliable methods and algorithms for protecting the 0.4 kV electrical network from emergency conditions and identifying the areas where they occurred.

The purpose. Development of a method for protecting rural 0.4 kV electrical networks from short circuits using a partitioning device and an algorithm for its implementation. RESEARCH METHODS. During the development of a method for protecting rural 0.4 kV electrical networks from short circuits and an algorithm for its implementation, the results of computer modeling of emergency modes of operation of a rural 0.4 kV electrical network were used. The dependencies obtained during modeling formed the basis for the development of the method. The method allows you to identify the type of short circuit and the section of the line where it occurred. When developing an algorithm for protecting rural 0.4 kV electrical networks from short circuits, the provisions of GOST 19.701-90 «Schemes of algorithms, programs, data and systems were used. Conditional designations and rules of execution».

Results. A method has been developed to protect a 0.4 kV power transmission line with desoldering from short circuits, identify the type of short circuit and the section of the line where it occurred. An algorithm for implementing this method has been developed.

Conclusion. The results obtained will be used in the development of technical means for sectioning rural electrical networks of 0.4 kV and substantiating their operating settings.

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