# Sectionalizing and Redundancy of the 0.38 kV Ring Electrical Network: Mathematical Modeling Schematic Solutions

DOI: 10.4018/IJEOE.2019100102
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## Abstract

The use of power line sectionalizing and power line redundancy in 0.38 kV networks entails the need to take into account the fact that currents and voltages can vary significantly at different points of the network. The article proposes a mathematical model to solve this problem. The mathematical model is based on the method of phase coordinates. Using mathematical modeling, the article determines the voltages and currents in the sections of the backup line after the automatic load transfer switch is activated. The article also proposes an improvement in the scheme of the power line sectionalizing unit. The sectionalizing unit scheme is suggested to be modified with a bypass circuit and the installation of a voltage indicator for signaling the voltage presence on the lower contacts of the switch.
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## 2. Materials And Techniques

The change of current and voltage at various points of the 0.38 kV power network under the influence of sectionalizing and redundancy entails the need to take this fact into account when modeling these networks and calculating their operating modes. Figure 1 shows the design scheme of a power network option equipped with sectionalizing and redundancy devices. This scheme allows to analyze the operating modes of the network. For example, if the advance section of line L1 is disconnected (Figure 1), it will result in the SU2 disconnection and the ATS 2 will be switched on subsequently. An additional load will be connected to the L2 line and the current there will be increased as a consequence. The current in the L2 line taking into account this increase should not become higher than the permissible which depends on the used wire section of line L2. The voltage in this line will also change. When connecting the load of an actively-inductive nature as an additional one (the most likely situation), the voltage across the entire L2 section will decrease due to the increased voltage losses in this power line.

Figure 1.

The design scheme of the power network option equipped with sectionalizing and redundancy devices

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