What is the function of high voltage ring main unit

The function of the high-voltage ring network cabinet is to contact the ring network line so that users can obtain power from two directions and improve the power supply reliability of the line; it has a simple structure, small size, and low price, and can improve the power supply Parameters and performance as well as power supply security and other advantages, it is widely used in distribution stations in load centers such as urban residential areas, high-rise buildings, factories and enterprises.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

High-voltage ring network cabinet is to improve the reliability of power supply and enable users to obtain power from two directions. The power supply network is usually connected in a ring shape. This power supply method is referred to as ring network power supply. In AC 10KV power distribution systems such as ports and high-rise buildings, due to the small load capacity, the high-voltage circuit is usually controlled by a load switch or vacuum contactor and is protected by a high-voltage fuse.

This system usually uses a ring network for power supply, and the high-voltage switch cabinet used is generally called a ring network cabinet. In addition to supplying power to the power distribution station, the high-voltage bus of the ring main unit also needs to pass through the ring power supply network's ride-through current (that is, the current that supplies power to the adjacent power distribution station through the bus bar of the power distribution station). Therefore, the high-voltage bus of the ring main unit The cross section should be selected based on the sum of the load current of the distribution station and the ring network through current.

It has the advantages of simple structure, small size, low price, and can improve power supply parameters and performance as well as power supply security. Therefore, it is widely used in distribution stations in load centers such as urban residential areas, high-rise buildings, factories and enterprises. And in box-type substations.

There are many types of ring network cabinet products, such as HK-10, MKH-10, 8DH-10, XGN-15 and SM6 series.

Ring network cabinet is a set of high-voltage switchgear installed in a steel plate metal cabinet or made into an assembled and partitioned ring network power supply unit. Its core part uses load switches and fuses, and has a simple structure and small size. It has the advantages of small size, low price, improved power supply parameters and performance, and power supply security. It is widely used in power distribution stations and box-type substations in load centers such as urban residential areas, high-rise buildings, large public buildings, factories and enterprises.

Ring network cabinets are generally divided into three types: air insulation, solid insulation and SF6 insulation. They are used for switching load current, breaking short-circuit current and transformer no-load current, and charging current of overhead lines and cable lines at a certain distance. , plays the role of control and protection, and is an important switching device for ring network power supply and terminal power supply. In the cabinet, the load switches equipped with air insulation mainly include gas-generating type, compressed air type, and vacuum type. The load switches equipped with SF6 insulation are SF6 type. Since SF6 gas is enclosed in the shell, the partition formed by it is invisible. The load switch in the ring main unit generally requires three positions, that is, cutting off the load, isolating the circuit, and possibly grounding. The gas-generating type, compressed air type and SF6 type load switch can easily realize three positions, while the vacuum arc extinguishing type can only break but cannot isolate. Therefore, the vacuum load ring network switch cabinet generally adds an isolation switch in front of the load switch to Form an isolation fracture.

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