The working principle of the high-voltage ring main unit

The working principle of the ring main unit:

Ring network refers to a ring-shaped distribution network, that is, the power supply trunk forms a closed ring, and the power supply supplies power to the ring trunk line, and then distributes power from the trunk line to the outside through the high-voltage switch. The advantage of this is that each distribution branch can take power from both its left-hand mains and its right-hand mains. When the left main line fails, it continues to receive power from the right main line. And when the right main line fails, it continues to receive power from the left main line. In this way, although the main power supply is single-circuit power supply. However, from each distribution branch, the benefits similar to dual-circuit power supply are obtained, thereby improving the reliability of power supply.

The so-called "high-voltage ring main unit" means that each distribution branch has a switch cabinet (outgoing switch cabinet), and the busbar of this switch cabinet is also a part of the ring trunk. That is to say, the ring trunk is formed by connecting the busbars of each outlet cabinet, and each outlet cabinet is called "high voltage ring main unit". In fact, if you take out a high-voltage ring main unit alone, you cannot see the meaning of "ring network".