Herasymenko V. Improving the reliability of protection and prevention of dangerous leakage currents in power supply systems with a voltage of 0.38 kV

Livestock facilities are facilities with high humidity and a chemically active environment, so protection systems in the operation of electrical systems and systems of livestock facilities are given considerable attention. Analyzing the scientific literature, it can be noted that there are virtually no studies to improve the reliability of protection and prevention of dangerous leakage currents in power supply systems of livestock premises with a voltage of 0.38 kV with elements of intelligent protection against leakage currents. In this regard, it can be stated that further development of research is the study of the physical process of dangerous leakage currents in electrical complexes and systems of livestock facilities, establishing patterns and relationships, and as a result the development of intelligent leakage protection with forecasting and warning. The proposed method of intellectual protection against the negative effects of leakage currents in livestock facilities differs from the existing ones by the ability to quickly diagnose and predict the magnitude of leakage currents, which provides the ability to warn of the possibility of exceeding their allowable values. The developed system of forecasting the values of leakage currents of the electrical equipment of the livestock premises carries out the analysis and operational-dispatching management of the electrical complex of the livestock premises depending on the results of the forecast. The system consists of two levels. At the top level is a personal computer, which houses SCADA - a system for collecting and processing information and an intelligent system for predicting leakage currents. At the lower level, there are actuators, indoor microclimate sensors, and feedback sensors for the parameters of electric motors. The purpose of the computer-integrated control system of the electrical complex of livestock premises based on forecasting the values of leakage currents is to prevent the impact of leakage current on the conditions of animals and the occurrence of dangerous consequences for living organisms. Also, the task of a computerintegrated system is to form a database that accumulates in the process of managing livestock space. The final decision on switching off or repairing the electric motor is made by the operator. In the dissertation, SCADA Trace Mode is used for technical and software realization of the developed control system of an electrotechnical complex of an animal room. Economic efficiency can be expressed through the lack of profit. One of the reasons for the lack of income in animal husbandry is the impact of leakage current on the milk yield of cows. Already a voltage of 2 - 3 mA causes cows to increase heart rate, and a current of more than 10 mA - stress. Thus, in dairy cows with prolonged or systematic exposure to leakage currents, there is a delay in milk production, and when fattening cattle there is a decrease in weight gain.