33KV Ring Main Unit RMU Switchgear: Your Primier Supplier
Ring6 33KV SF6 insulated ring main unit(rmu) switchgear is extendible designed for the medium voltage secondary distribution network in 10 different types of configurations suitable for switching system up to 36KV.
One of the main advantages of rmu switchgear is that provides greater security for the users. The switchgear is in the ring network which connected with 2 lines power supply when 1st line power shut down, the 2nd line power is available for supplies.
Ring6 ring main unit can be supplied in 4 ways, 5 ways or 6 ways standard configurations with additional equipment according to customer’s specification, all of the rmu combinations was designed according to IEC62271 standard.
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Features of 33KV RMU Switchgear
Ring6 33KV ring main unit(rmu) was designed in as compact switchgear with complete sealed tank filling sf6 gas, all of the live components were contained there, the maximum number of modules in one tank is 6 units. This advanced design could ensure the stability of the switchgear and the safety of the operator.
Ring6 rmu switchgear provides two types way to protect the transformer: load switch fuse protector composite apparatus and circuit breaker with relay protection. Load switch fuse protector composite apparatus is used for the transformer with 1600kVA and below.
Circuit breaker with relay protection is used to protect transformers in various capacities. Ring6 can be equipped with integrated remote control and monitoring units according to the requirement of customers.
Also, when one unit rmu broke, the others could connect with the same function. Although the main power supply is the single-circuit power supply, it is similar to the two-way power supply from each distribution branch, thereby this function improving the reliability of the power supply.
Routine tests will be done on every unit before dispatch and the installation will be according to the circuit diagram exactly.
Ring main unit consists of incoming feeders and outgoing feeders, normally the incoming feeders designed to be vacuum circuit breaker module and outgoing feeders connect with transformers.
| Ring6 33KV | C-module | F-module | v-module | ||||
| Switch disconnector | Earthing switch | Switch-fuse disconnector | Downstream earthing switch | Vacuum circuit-breaker | Earthing switch/ disconnector | ||
| Rated voltage | kV | 36/ 40,5 | 36/40,5 | 36/40,5 | 36/ 40,5 | 36/ 40,5 | 36/ 40,5 |
| Power frequency-withstand voltage | kV | 70/95 | 70/95 | 70/95 | 70/95 | 70/95 | 7D / 95 |
| -across disconnector | kV | 80/ 110 | 80/110 | 80/110 | |||
| Lightning inpulse withstand voltage | kV | 170/185 | 170/185 | 170/185 | 170 /185 | 170/185 | 170/185 |
| -across disconnector | kV | 195/215 | 195/215 | 195/215 | |||
| Rated normal current | A | 630/ 6301) | 200/ 2002) | 630/ 6301) | |||
| Breaking capacities | |||||||
| -active load | A | 630/ 630 | 200/ 200 | ||||
| -closed loop | A | 630/ 630 | 200/ 200 | ||||
| -off load cable charging | A | 20/ 21 | 20/21 | 50(Class Cl) | |||
| -earth fault | A | 60/63 | 60/63 | ||||
| -earth fault cable charging | A | 35/36 | 35/36 | ||||
| -transfer current | A | 840/750 | |||||
| -shart-circuit breaking current | kA | see3) | 20/20 | ||||
| Making capacity | kA | 50/50 | 50/50 | see3) | 2,5/ 2,5 | 50/50 | 50/50 |
| Class (Electrical endurance) | E3/ E2 | E2/E2 | -/- | E2/E2 | E1/ E1 | E2/E2 | |
| Short time current 1 sec.4) | kA | 16/16 | 16/16 | 1/1 | 16/16 | 16/16 | |
| Short time current 1 sec.5) | kA | 25/25 | 25/25 | 25/25 | 25/ 25 | ||
| Short time current 3 sec.5) | kA | 20/20 | 20/20 | 20/20 | 20/20 | ||
| Internal arc classitication IACAFL,1s | kA | 20/20 | 20/20 | 20/20 | |||
1) 400A for bushings Interface B (400 series plug-in) 2) Depending on the current rating of the fuse-link 3) Limited by high voltage fuse-links 4) Max. rating for bushings Interface B (400 series plug-in)
5) Valid for bushings Interface C
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