Metal Enclosed SF6 Ring Main Unit
Ring Main Unit is a compact and comprehensive solution suitable for secondary distribution networks up to 24kV, requiring little maintenance and minimal space. It has many applications in wind power plants, small industries, construction, mines, airports and Underground facilities. Feature: 1....
Description
Ring Main Unit is a compact and comprehensive solution suitable for secondary distribution networks up to 24kV, requiring little maintenance and minimal space. It has many applications in wind power plants, small industries, construction, mines, airports and Underground facilities.
Feature:
1. Technology
Metal enclosed unit for indoor installation and type tested.
Insulated by SF6 gas.
Maintenance-free and easy to install.
Not affected by climate.
On-off-ground, three-position load disconnect switch.
Use recyclable materials.
2. Security
When there is electricity in the cable, it can be easily accessed and operated safely.
The operating status is clearly indicated through the mimic diagram on the front panel.
Fully automatic interlocking system.
Operate only when the door is completely closed.
The fuse box can only be used when the load disconnect switch is grounded.
Voltage detector to check whether the cables are arranged.
The rupture disk is designed to protect equipment in emergency situations such as gas expansion.
If an unexpected current occurs, safety tests are carried out on the internal arc tolerance to ensure the safety of the operator. (21kA / 1s, no SF6 gas)
3. Durability and practicality
The metal closed tank is airtight. This means that it is not affected by the environment, such as dirt, small insects, moisture, etc.
The front part of the ring main unit can be operated with load disconnecting switch.
The interlocking system can be operated automatically according to the operator's position, so all switch operations can be performed on the personnel safely.
Charging is not required until the service life of SF6 gas.
Remote operation possible when using motor operating mechanism
In the event of a failure, the power fuse will automatically trip the mechanism by striking the pin of the fuse connected to the mechanism.
4. Save costs
After installation, no maintenance is required except to replace the power fuse.
The compact design requires minimal space for local installation and operation, which is its main advantage, especially where space is limited.
Due to the long service life, there is no need to pay additional replacement costs.
Materials can be recycled after the end of the service life.
| Rated Voltage | kV | 12 | 17.5 | 24 |
|---|---|---|---|---|
| Rated frequency | Hz | 50/60 | 50/60 | 50/60 |
| Rated power frequency withstand voltage | kV | 28 | 38 | 50 |
| Rated lightning impulse withstand voltage | kV | 75 | 95 | 125 |
| Rated current main busbars | A | 630 | 630 | 630 |
| Rated short-time withstand current (3s) | kA | 21 | 21 | 21 |
| Rated short-circuit making current | kA | 54.6 | 54.6 | 54.6 |
| Internal arc fault current (1s, AFAL) | kA | 21 | 21 | 21 |
| Rated SF6 gas pressure | Psi.G | 5 | 5 | 5 |
Field Application
RMU can be installed on medium voltage distribution networks and are mainly used to protect transformers in compact substations. It is used for medium voltage power distribution in compact substations, small buildings, residential quarters, large shopping malls, airports, subway stations, etc. containing medium voltage networks.
Hot Tags: metal enclosed sf6 ring main unit, China, manufacturers, suppliers, customized, Electrical Ring Main Unit, 33KV Ring Main Unit, SF6 RMU Switchgear, SF6 insulated switchgear in power plant, AC Metal Enclosed Ring Main Unit, gas insulated switchgear low voltage
