What is the RMU bushing?
RMU:
It is the abbreviation of Ring Main Unit. It is a kind of switchgear.
Bushing:
In electrical equipment, a bushing is an insulating device.
Conclusion: RMU Bushing refers to the insulating interface installed on the ring main unit shell, which is used to connect the internal busbar and the external cable. It serves as a bridge for the power connection between the inside and outside of the cabinet.
Main functions and roles
Insulation and sealing: These are the most fundamental functions. The bushing must provide sufficient high-voltage insulation strength to ensure that no breakdown occurs between the live conductor and the grounded metal cabinet. At the same time, it also needs to seal the cabinet body to prevent dust and moisture from entering and maintain a dry and clean insulating environment inside the cabinet (especially crucial for inflatable RMUs).
Mechanical support and fixation: Provide stable mechanical support and positioning for the terminal heads or connectors of the connected cables.
Electrical connection: Achieve reliable electrical connection between the busbar inside the cabinet and the external cable, ensuring good electrical conductivity and low contact resistance.
Safety isolation: Clearly separate the high-voltage live parts from the outer parts of the cabinet that are accessible to personnel to ensure operation and maintenance safety.
Why is it important?
High-incidence fault points: The conduit is the interface point connecting the inside and outside, which is easily affected by the external environment (such as humidity, dirt, small animals), and it is also the place where stress is concentrated during installation operations (such as plugging and unplugging cable heads). Therefore, it is a potential failure point in the RMU.
Determining equipment reliability: A high-quality and well-designed casing is crucial for the long-term operational reliability and maintenance-free performance of the entire ring main unit.
Safety barrier: It is directly related to the safety of the operators and is a key barrier to prevent electric shock.
As a professional manufacturer of RMU Bushing, SUVELL is a component that may seem insignificant but is extremely important. It integrates the functions of insulation, sealing, connection and support. Its technical level and quality directly affect the safety, reliability and miniaturization degree of the ring main unit. And we can provide you with a complete set of solutions to help you save costs and ensure worry-free after-sales service.