High-voltage ring main units (HV RMUs) are commonly seen in residential districts, high-rise buildings, and other locationss. An HV RMU is an electrical device that integrates a set of high-voltage switchgear in a steel plate metal cabinet or is configured as an assembled compartmentalized ring network power supply unit. It features a simple structure, reliable operation, safety and stability, minimal maintenance requirements, and low operating costs, offering more advantages than traditional switchgear equipped with circuit breakers. Moreover, with the continuous advancement of RMU technology, the products not only have excellent performance but also are more serialized, which has expanded their scope of application. So, what are the specific functions of these high-voltage ring main units?
The core components of an HV RMU include load switches and fuses. Due to its small load capacity, its high-voltage circuit is usually controlled by load switches or vacuum contactors and equipped with high-voltage fuses for protection. The power supply network is typically connected into a ring structure, a mode referred to as "ring network power supply" for short. The main function of an HV RMU is to allow users to obtain power from two directions, thereby improving power supply reliability. It also boasts advantages such as a simple structure, compact size, low cost, enhanced power supply parameters and performance, and improved power supply safety. Therefore, it is widely used in power distribution stations at load centers (e.g., urban residential districts, high-rise buildings, factories, and enterprises) as well as in box-type substations.
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