Overview
The 12 kV SF6 ring main unit is designed for medium voltage power distribution systems in industrial plants, commercial buildings, substations, renewable energy projects and urban power grids. Its compact structure and metal enclosed design provide safe and reliable operation in indoor distribution applications.
The unit adopts SF6 gas insulation technology, which gives stable insulation performance and low maintenance requirements. It supports flexible feeder combinations and can be equipped with load break switches, vacuum circuit breakers, protection relays and intelligent monitoring systems according to the requirements of each project.
The cabinet is manufactured from high quality galvanized steel and complies with IEC standards. Compact dimensions, straightforward installation, mechanical safety interlocking and a long service life are the main design objectives. OEM and customised solutions are available for different voltage levels and distribution applications.
Key Features
- SF6 gas insulation — the insulating medium gives stable dielectric performance inside a compact enclosure and keeps maintenance requirements low.
- Metal enclosed construction — the galvanized steel cabinet provides mechanical protection and a grounded metal barrier around the live parts.
- Flexible feeder configuration — the unit supports different combinations of incoming and outgoing feeders to match the network layout.
- Selectable switching devices — load break switches or vacuum circuit breakers can be fitted, depending on whether switching duty or fault breaking is required.
- Protection and monitoring options — protection relays and intelligent monitoring systems can be integrated for remote status visibility and fault detection.
- Safety interlocking — mechanical interlocks prevent incorrect operation sequences between the switch, the earthing position and the cable compartment.
Technical Specifications
| Rated voltage | 12 kV |
|---|---|
| Rated frequency | 50 Hz |
| Insulation medium | SF6 gas |
| Enclosure | Metal enclosed, galvanized steel cabinet |
| Switching devices | Load break switch and/or vacuum circuit breaker, selected per project |
| Feeder configuration | Flexible combinations of incoming and outgoing feeders |
| Optional equipment | Protection relays, intelligent monitoring system |
| Applicable standards | IEC |
| Installation | Indoor |
| Customisation | OEM and customised solutions available |
Applications
- Industrial plants — distribution for manufacturing and processing facilities.
- Commercial buildings — medium voltage distribution inside commercial complexes.
- Substations — feeder switching and protection in medium voltage substations.
- Renewable energy projects — collection and distribution circuits for solar and wind generation.
- Urban power grids — compact medium voltage distribution in space-restricted city locations.
Installation Conditions
- The unit is designed for indoor installation in a distribution room or switchroom.
- Allow adequate space in front of the cabinet for cable termination and for operation of the switching devices.
- Provide a level foundation or floor channel that suits the cabinet footprint and cable entry arrangement.
- Check the room ventilation and access arrangements against the requirements of the installation before commissioning.
How to Select
- Rated voltage and rated current required by the network.
- Number of ways and the switching configuration of each feeder.
- Whether load break switches, vacuum circuit breakers or a combination of both are needed.
- Protection and remote control functions required, including relays and monitoring systems.
- Indoor or outdoor installation and the required protection rating.
FAQ
What is a 12 kV SF6 ring main unit used for?
It is used for medium voltage power distribution in industrial plants, commercial buildings, substations, renewable energy projects and urban power grids. In a ring network it allows a feeder to be switched and isolated at each node without interrupting supply to the rest of the ring.
Why use SF6 gas as the insulating medium?
SF6 has high dielectric strength, so the required insulation distances inside the enclosure are much shorter than in air. This allows a compact cabinet and a sealed gas compartment that keeps the live parts protected from the surrounding environment and reduces maintenance.
Can it be fitted with a vacuum circuit breaker instead of a load break switch?
Yes. The unit supports flexible feeder combinations and can be equipped with load break switches, vacuum circuit breakers, or a mix of the two, depending on whether the feeder only needs switching or also needs to break fault current.
Does it support remote monitoring?
Protection relays and intelligent monitoring systems can be integrated into the unit according to project requirements, which allows status data and fault indications to be collected for remote supervision.
Is the enclosure suitable for outdoor use?
The standard arrangement is for indoor installation. If your project requires an outdoor arrangement, provide the site conditions when specifying the unit so the appropriate configuration and protection rating can be confirmed.
Can the configuration be customised?
Yes. OEM and customised solutions are available for different voltage levels and distribution applications. The feeder combination, switching devices and auxiliary equipment are all specified per project.
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