Ring main units are a comprehensive power device mainly used in urban power grids and distribution systems of large industrial enterprises. It can achieve various functions such as power switch, branch control, protection, etc. It has the characteristics of high automation, good reliability, and high safety.

1.Structure of Ring Main Unit

The Ring main units consists of the main frame, isolation room, instrument room, switch room, cable grounding room, and other parts. The main frame is generally made of metal sheets, which can support all electrical equipment and protect the equipment from external influences and vibrations. The isolation room is set up to ensure the safety of operators. The instrument room is used for installing voltage, current, frequency and other instruments. The switch room is the management center of the power supply section, and the cable grounding room is used for grounding.

2.The purpose of ring main unit

Ring main units can be widely used in different fields. In terms of urban distribution networks, it can be used in substations, distribution rooms, and other places. In industrial production processes, it can be used in enterprises such as petrochemicals, metallurgy, and coal, as well as in large public buildings such as hospitals and sports venues.

3.Voltage level of ring main unit

According to the different voltage levels, ring main cabinets can be divided into two types: high-voltage ring main cabinets and low-voltage ring main cabinets. The rated voltage of high-voltage Ring main units is generally 10kV~40.5kV, mainly used in high-voltage distribution systems in urban power grids. The rated voltage of low-voltage ring main unit is generally 0.4kV, mainly used in low-voltage distribution systems in urban power grids.

4.The difference between high-voltage and low-voltage ring main cabinets

High voltage Ring main units are generally used in substations, distribution stations, and other places, and must ensure safety and reliability. Low voltage ring main unit is used for indoor power distribution, with simple installation, low power, and relatively low cost. The insulation technology requirements for high-voltage ring main cabinets are relatively high, while low-voltage ring main cabinets do not need to consider insulation issues.

5.Summary

Ring main unit is an indispensable and important power device in urban power grids and industrial enterprises, which can be either high-voltage or low-voltage. It is very important to choose the appropriate Ring main units according to the specific application field and requirements.

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