Abstract
The overestimated length of rural power lines of 0.38 kV leads to the fact that it is often not possible to fulfill both the sensitivity conditions of the protective device installed at the transformer substation and protecting the line from overloads and short circuits, and the requirements of the power supply reliability of consumers. This problem can be solved by installing in-line universal sectionalizing point equipped with an automatic load transfer function. The use of these devices allows dividing a line into sections provides the necessary sensitivity of protection for each section of the line and the possibility of supplying power to undamaged areas from a backup power source. In addition, only with the use of automated switching devices installed in power lines, it is possible to create intelligent electrical networks. When developing these devices, it is necessary to take into account the electromechanical characteristics of switching devices that are planned to be used for switching lines.
Highlights
The universal sectionalizing point (SP) equipped with an automatic load transfer (ALT) function, microcontroller control unit of the pole-mounted version (SPALT(PM)) is a device designed to perform the functions of sectionalizing and redundancy in 0.38 kV electrical networks
The LSM/TEL-1-4/400 low-voltage vacuum contactor is designed for switching electrical circuits in three-phase alternating current networks of industrial frequency with nominal voltage depending on the performance up to 1140 V
The use of devices that allow dividing the power line into areas provides the necessary sensitivity to protect each section of the line as well as the ability to supply power to undamaged areas from a backup power source
Summary
The universal sectionalizing point (SP) equipped with an automatic load transfer (ALT) function, microcontroller control unit of the pole-mounted version (SPALT(PM)) is a device designed to perform the functions of sectionalizing and redundancy in 0.38 kV electrical networks. This device allows dividing the 0.38 kV power line into sections and supply power to undamaged areas from a backup power source via the ATS function [1,2,3,4]. It is important to choose the right switching device in terms of its electromechanical characteristics First of all, this device should be controlled remotely, must provide the ability to switch short-circuit currents and perform switching at high speed, must have high switching durability
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