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With the development of technology, power electronic systems are used more and more in the electricity sector and become more important. Power electronics technology is used in high voltage, medium voltage, low voltage, automation or lighting systems, in short, in every field of electricity.

The use of battery and rectifier groups, which are a supply and power electronics system in medium voltage distribution networks and substations, is of great importance. The battery rectifier group is a structure consisting of a semiconductor-based rectifier with constant voltage, automatic regulation according to the change in mains voltage, and battery groups, which meet the DC energy needs of the equipment in the transformer or distribution centers, which are constantly connected to the direct current loads found there.

In the substation where the battery rectifier groups are located, the motor and on-off coils of the medium voltage cells, lighting lamps, signal lamps, etc. supplies equipment. While the mains supply voltage is 220 VAC, the output voltage of the rectifier can be 24 VDC, 48 VDC or 110 VDC. We can group these structures in two parts as battery group and rectifier section.