Single Line 11kv Ring Main Unit Circuit Diagram

The figure shows the circuit diagram of ring main network used for distribution secondary of power to houses and small industries.

Single line 11kv ring main unit circuit diagram. Front view and single line diagram efi 21ka 17 5 kv 400a ct self powered relay 21ka 17 5 kv 200a 21ka 17 5 kv 400a efi 21ka 17 5 kv 630a ct. This incomer feeder is given with the provision of bushing protruding from the enclosure of rmu for supply cable connection. Front view and single line diagram figure 2. Ring main unit comprises of one incomer feeder and one or more outgoing feeder.

Distribution transformer dyn11 11 0 415kv 3. Low voltage distribution board. 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. 11kv substation construction three main sections of electrical substation 1.

Ring circuits are commonly used in british wiring with socket outlets taking fused plugs to bs 1363 because the breaker rating is much higher than that of any. Protection with tlf time limit fuse or self auxiliary powered relay. 11kv sf6 ring main unit. The main function of the substation is to collect the energy transmitted at high voltage from the generating station and then reduce the voltage to an appropriate value for local distribution and gives facilities for switching.

The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers. Switchgear ring main unit rmu with fuse circuit breaker single line diagram p e 2. 11kv sf6 ring main unit rmu for secondary distribution network was designed by orecco with the advantages of uninterrupted power supply. The ring is fed from a fuse or circuit breaker in the consumer unit.

A ring main unit rmu is a totally sealed gas insulated compact switchgear unit. Fully interlocked protection with padlocking facilities. The power is distributed through these rmus for the end consumers. The ring starts at the consumer unit also known as fuse box distribution board or breaker box visits each socket in turn and then returns to the consumer unit.

The incomer feeder is either vacuum circuit breaker or sf 6 circuit breaker with associated disconnect switch and earth switch. Single line diagram of 11kv substation substation provides the energy supply for the local area in which the line is located. 11kv ring main unit with 3 lbs and 1 cb. Different combinations of these primary switching devices within the unit are commonly used.

17 5 kv 2 ring switches up to 630 a 1 vacuum circuit breaker up to 630a. Up to 12kv 630a ring switches 250a tee off cb. 17 5 kv 2 ring switches up to 630a 1 vacuum circuit breaker up to 630a. Ring main units are the major part of ring main network.

Let s see about ring main unit. 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.