Fully interlocked with cable box for earth and test facility.
Rmu ring main unit single line diagram.
A ring main unit rmu is a totally sealed gas insulated compact switchgear unit.
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.
The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers.
It is a complete switchgear in itself.
Read more ring main unit rmu introduction.
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.
The ring main unit is an innovative solution that makes it easier to manage the numerous challenges of electrical distribution.
Front view and single line diagram figure 2.
Rmu of different voltage mostly 12 kv and 24 kv and current ratings are.
17 5 kv 2 ring switches up to 630 a 1 vacuum circuit breaker up to 630a.
Sbs 3 way compact indoor type rmu sbs 3 way compact outdoor type rmu figure 1.
These units allow the connection of transformers through under ground cables and also provide protection to the transformers.
Front view and single line diagram efi 21ka 17 5 kv 400a ct.
Rmu is an all in one solution and is safe easy to install and maintenance free switchgear helping the utilities improve reliability uptime of the network and reduce the operational costs.
Single line mimic diagram with clear indication of switch position on off or earth position.
The rm6 is a compact unit combining all mv functional units to enable connection supply and protection of transformers on an open ring or radial network.
Different combinations of these primary switching devices within the unit are commonly used.
Technical specification of motorised rmu page 2 of 28 technical specification for 22 and 11 kv ring main unit switchgear table of contents 1 0 scope 2 0 general 3 0 standards 4 0 the standards mentioned above are available from 5 0 climate conditions 6 0 rmu outdoor metal clad 7 0 take off terminal units for future automation.
Operations counter indicator.
A complete switchgear means assembly of required switching devices protection device as well as metering device.
17 5 kv 2 ring switches up to 630a 1 vacuum circuit breaker up to 630a.
B by a fuse switch combination up to 2000 kva b by a circuit breaker with protection unit up to 8000 kva.
The major advantage of ring main units is the safety they provide to the operators.
The switchgear and busbars are enclosed in a gas tight chamber fi lled with sf6.
Ring main units are available in different voltage ratings ranging from 11kv to 33kv.
