Intelligent System Current Protection from Short Circuits

Currently, with the introduction of electrical smart grids, one of the main problems is to increase authenticity of the inclusion of relay protection devices during emergency modes. This is due to the fact that a short circuit current, and therefore, a setpoint, is affected by large number of external factors, such as humidity of the ground and the atmosphere, an external ambient temperature, a soil condition, terrain and etc. Therefore, the relay protection devices must take into account the influence of these factors and introduce automatic correction for the setpoint, i.e. the devices must be intelligent. The intelligent device has been developed for to find a decision for this problem. The device contains a microprocessor and the set of sensors of physical quantities for the external factors. A more accurate calculation of relay protection parameters will allow increasing sensitivity and avoiding failures of the inclusion or the false inclusion of the protection. The results of the research can be applied to make a multidimensional mathematical model, which will allow one to automatically select relay protection settings based on the initial data of weather conditions, time of year, resistance of soil, current, voltage and etc.