Abstract
The most common type of short circuit in a three-phase system is a single-phase-to-ground short circuit, accounting for 70 to 90% of electrical faults. In this paper simulation of the protective device from single-phase-to-ground short circuit with automatic change of current setting in electrical networks of 6-10 kV voltage on the basis of Coloured Petri Net is considered. The complexity of elaborated technical systems makes the problem of their modelling actual at the stage of development with the purpose of obtaining estimations of prospective and achievable characteristics. Now the modelling theory of the dynamic discrete systems, based on the formalism of Coloured Petri Nets has a wide application. Petri Net, describing the device operation, was designed and analysed using CPN Tools Programm. The resulting Petri net is correct, as it is live, reversible and safe. Thereby designed device can provide the selective protection from single-phase-to-ground short circuit.
Highlights
The most widespread kind of damages in electrical networks of 6-10 kV voltage is single-phase-to-ground short circuit (SPGSC) comprising 70-90 % of the general number of electrical damages
- occurrence in the electrical network of 2,4-3,5 multiple surge voltages in comparison with phase voltage, that can lead to insulation damage of undamaged phases and to the transition of SPGSC in a two-place or double short circuit to ground, which is close to two-phase short circuits;
Unlike the “classical” Petri Nets, in Color Petri Nets (CPN) an important role is played by data typification based on the conception of colour multitude, which is similar to the type in declarative programming languages
Summary
The most widespread kind of damages in electrical networks of 6-10 kV voltage is single-phase-to-ground short circuit (SPGSC) comprising 70-90 % of the general number of electrical damages. In order to increase efficiency of power supply system the device for centralized protection from single-phase-to-ground short circuit is developed. - occurrence in the electrical network of 2,4-3,5 multiple surge voltages in comparison with phase voltage, that can lead to insulation damage of undamaged phases and to the transition of SPGSC in a two-place or double short circuit to ground, which is close to two-phase short circuits;. - occurrence of ferroresonance phenomenon, resulting in frequent voltage transformers falling out, sometimes in the damage of underloaded power transformers working in a mode near to idling;. - insulation damage of the motor stator windings, which leads to the occurrence of dangerous coil or phase-to-phase short circuits;. It is necessary to specify the operating current by actual test
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