Primary & Secondary Integrated Ring Main Unit (RMU)

This RMU integrates primary switchgear and secondary protection, control and communication modules into a compact integrated unit. Applicable to 12kV/24kV  voltage distribution networks, it realizes power distribution, load switching, intelligent fault detection, rapid fault isolation and automatic power restoration of healthy sections, greatly improving power supply reliability.

• Highly Integrated Design
  Primary switching equipment and secondary protection, control & communication units are pre-assembled and factory-tested. No on-site secondary wiring is required. Plug-and-play installation reduces installation and commissioning costs by more than 70%.
• High Reliability & Compact Structure
  Fully insulated and hermetically sealed structure adapts to harsh environments such as high humidity and heavy pollution. The cabinet width ranges from 350mm to 500mm, saving space greatly, suitable for urban power grid reconstruction and prefabricated substations.
• Intelligent Protection & Distribution Automation

   Battery-free self-powered protection, no external auxiliary power required

   Overcurrent protection, instantaneous protection, zero-sequence earth fault protection and     automatic reclosing

   Feeder Automation (FA): Fast fault location and isolation for short-circuit and earth faults

   Optional DTU/FTU intelligent terminals, supporting IEC 101/104, Modbus protocols,               seamlessly connected to distribution master stations

• High Safety & Easy Operation

   Independent pressure relief channels and internal arc resistance design

   Mechanical & electrical five-prevention interlock for each cabinet door

   Optional motor operating mechanism, supporting remote/local operation and one-key sequential control

• Ring power supply for residential quarters and commercial buildings
• Secondary power distribution for industrial parks, factories and mining sites
• Grid access for distributed renewable energy (photovoltaic, wind power)
• Prefabricated substations, switching stations and outdoor RMU cabinets