Ring Main Unit Rmu Circuit Diagram

Ring main unit rmu is a compact sealed for life metal enclosed switchgear widely used in urban power distribution network.

Ring main unit rmu circuit diagram. Front view and single line diagram efi 21ka 17 5 kv 400a ct. The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers. What is ring main unit. Ring main unit is a compact gas insulated switchgear cubicle equipped with sf6 switch disconnector and sf6 circuit breakers.

This incomer feeder is given with the provision of bushing protruding from the enclosure of rmu for supply cable connection. Different combinations of these primary switching devices within the unit are commonly used. What is ring main unit rmu. A ring main unit includes a combination of one or more load break switch lbs cum earth switch as incomer and outgoing feeder and vacuum circuit breaker with associated disconnector and earth switch for load feeders.

It also includes a protection device and a metering device. 17 5 kv 2 ring switches up to 630a 1 vacuum circuit breaker up to 630a. Front view and single line diagram figure 2. Sbs 3 way compact indoor type rmu sbs 3 way compact outdoor type rmu figure 1.

A ring main unit rmu is a totally sealed gas insulated compact switchgear unit. These are utilized for medium voltage power distribution. Both oil and gas insulated ring main units are the result of extensive innovation using advanced technologies and are subjected to extensive testing and safety. Ring main unit is a compact sealed and enclosed type of switchgear.

The below figure shows the rmu with 3 incomers and 1 outgoing feeder to distribution transformer. Rmu ring main unit. The ring main unit rmu is an electrical device applied to the power supply unit of the secondary distribution system. The incomer feeder is either vacuum circuit breaker or sf 6 circuit breaker with associated disconnect switch and earth switch.

Ring main units our range of ring main units rmus are all suitable for both indoor and outdoor locations and are designed to operate in the most extreme environmental conditions. This is a new practical video which explains the practical components of the electrical panel rmu or ring main unit this is during its factory acceptance te. It s complete switchgear in itself. A very fantastic ring main unit rmu presentation by us.

Ring main unit comprises of one incomer feeder and one or more outgoing feeder. You see complete switchgear simply means assembly of needed switching devices.