Design Of Insulator And Equipment Interface In Medium Voltage Ring Main Unit

Ring main units are modular switching devices used in medium-voltage power distribution networks. They are typically used in systems ranging from 10kV to 35kV and encompass power distribution, protection, and switching functions. In these systems, polymer deadend insulator needs to maintain stable dielectric properties at the rated electrical voltage level, while also cooperating with the internal switching elements, bus connections, and terminal interfaces of the ring main unit. Its material, geometry, mechanical strength and other parameters are directly related to the long-term stable operation performance of the equipment.

For 20kV/35kV ring main units, the specifications of porcelain dead end insulators and its internal layout will vary depending on the internal structure. The suspension insulator not only needs to adapt to different voltage levels, but also needs to meet the requirements for coordination with switchgear and busbar systems. This compatibility is reflected in precise installation spacing, clear electrical distance control, and compatibility with external line connections.