Ring Main Unit (RMU) is a 11 KV or 33 KV HT panel having 3 nos. of switches (Circuit Breakers or Isolators or LBS) that are 2 for incoming one for outgoing. It enables consumer use 2 sources of HT power in at the same metering point. It is a totally sealed, gas-insulated compact switchgear unit.
RMU is to be used two incoming with mechanical or electrical interlock and one out going to the load generally but some times incoming engineering distribution
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| Figure 1 – Outlook of a typical three-feeder 24 |
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| Figure 2- 11 KV 2 Incoming and 3 Outgoing RMU at Bangladesh Film Archive. |
Ring Main Unit is used in a secondary distributi on system. It is basically used for an uninterrupted power supply. Alongside, it also protects your secondary side transformer from the occasional transient currents.
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