Criteria of definition of the type of emergency operation in networks of 0.38 kW when using the relations of tension and currents

The problem of determining the type and loca-tion of emergency operation in electric networks is important and urgent. In the class of networks of 110 kW and higher, many techniques and emer-gency modes have been developed for detection devices. At the same time the calculation of the emergency operation is increasingly used as meth-od of finding phase coordinates, but this method is limited for finding the phase coordinates in 0.38-6-10-35 kW distribution. In addition the industry does not yet produce the appropriate fittings for these distribution networks. The use of the distribution networks in the devices designed for networks of 110 kW and higher is neither technologically nor economically effective. As such, there is a need to develop special methods and instruments designed specifically for these distribution networks. Deter-mination of the type and place of the emergency operation requires the development of specific cri-teria. Nowadays most of these criteria are based on the ratios of voltages and currents in the coordi-nates of three symmetrical components. However, replacement ratios of actual voltage and current in phase coordinates can now be used. This article is a continuation of the research being conducted in the department of Information Technology for elec-trical power at Kostroma state agricultural acade-my. The goal of this article is to develop criteria for determining the types of emergency operation in networks 0.38 kW. The calculation emergency op-eration was carried out by the phase coordinates themselves. Three criteria were investigated in or-der to determine the types of alarm modes for 0.38 kW networks. They included the relationship of stress in the corrupted phase to phase voltages left intact, the relationship of flow during the corrupted phase to flow during intact phases, and the sum of these relations. Intervals were built, and the ranges of these criteria were identified, allowing for the ex-act identification of the type of emergency mode, using both metal circuit, and in-circuit through con-tact resistance. The results can be used to develop methods and devices determining the type and lo-cation of an emergency mode in the networks of 0.38 kW. In addition to developing new devices, the results can be used in modern microprocessor de-vices in order to protect these networks, for exam-ple, in the device SIRIUS-2 0.4. That is, basing on the results of this research, the functionality of this device can be extended and added to the calcula-tion process.