Box variable loop network type and terminal are two common devices in power systems, their main differences are as follows:
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1. Different functions: box variable ring network type is mainly used for medium voltage distribution in power distribution system, while the terminal is mainly used for terminal wiring in low voltage distribution system.
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2. Different installation positions: the box variable ring network type is usually installed at the end of the medium voltage line, and the terminal is installed at the end of the low voltage line.
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3. Different forms of equipment: box variable ring network type is usually a box, which contains transformers, switches and other equipment, while the terminal is a junction box, which contains wiring, fuses and other equipment.
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4. Different voltage levels: the voltage level of the box variable ring network type is usually 10kV or 20kV, and the voltage level of the terminal is usually 400V.
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5. Different uses: the box variable ring network type is mainly used to convert medium-voltage electric energy into low-voltage electric energy for the use of users, while the terminal is mainly used to connect low-voltage electric energy to user equipment.
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In short, although the box-variable ring network type and the terminal are all distribution equipment in the power system, there are obvious differences in their functions, installation positions, equipment forms, voltage levels and uses.
In order to improve the reliability of power supply, the user can obtain power from two directions, usually the supply grid is connected into a ring. This power supply mode is referred to as ring power supply. The so-called ring network cabinet is that each distribution branch is equipped with a switch cabinet, and the bus bar of this switch cabinet is also a part of the ring trunk. The circular trunk is composed of the bus bars of each outlet cabinet connected together.
The terminal box is placed at the end of the bus trunk system, so that the copper bar of the bus is not exposed, which is generally small, which is called the terminal box.