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What is RMU Ring Main Unit
2019-04-09 10:55:00 view:1374
What is RMU, Ring main unit

A Ring Main Unit (RMU) is a totally sealed with SF6 gas or other insulation material, Rockwill's RMU is a gas-insulated compact switchgear unit.

A ring main unit (RMU)  which is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network.

A ring main unit or RMU is combinated with minimum three ways together, The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers (VCB or GCB).

Normally, a primary circuit breaker is the switching device, which can be vacuum circuit breaker or gas circuit breaker ,etc. it is always equipped with protective relay,  it is a very basic self-powered type or a more advanced one with communication capabilities.
It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch that feed a distribution transformer.

The rated voltage and current ranges for RMUs typically reach up to 40.5 kV and 630 A respectively.

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