XGN15-12 | 12kV SF6 Gas Insulated Ring Main Unit

🔹 Product Introduction

The XGN15-12 is an indoor AC 50Hz, 12kV class SF₆ ring main unit, with SF₆ load switch as the main switch and the entire cabinet using air insulation. It is primarily used for control and protection in ring network or radial power supply systems, suitable for prefabricated substations and power distribution automation scenarios, and complies with domestic and international standards such as GB 3906 and IEC 62271-200.

🔹 Core Specifications (General Type)

Parameter	Typical Value	Notes
Rated Voltage	12kV	Compatible with 10kV systems
Rated Current	630A	Common specification for main circuits
Rated Short-Circuit Breaking Current	20kA/25kA	Depends on the load switch/combination electrical configuration
Rated Short-Time Withstand Current	20kA/25kA, 4s	Meets system dynamic and thermal stability requirements
Arc Extinguishing/Insulation	SF₆ gas + air insulation	Main switch sealed gas tank, entire cabinet air-insulated
Operating Mechanism	Spring-loaded, manual/electric	Standard for 3-position load switches
Protection Class	IP3X/IP40	Cabinet enclosure protection class; the gas tank has higher protection
Ambient Temperature	-25℃~+40℃	Wide temperature range for most regions

🔹 Core Selling Points & Performance

1. Safe and Reliable Modular Structure

The cabinet is CNC-formed from aluminum-zinc-coated steel/galvanized steel, divided into independent compartments including busbar room, switch room, cable room, and instrument room, with a pressure relief channel at the back to meet "five-prevention" interlocking functions. It supports a flexible combination of standard modules such as load switches, combination electrical appliances, circuit breakers, and PT/metering units, with optional left/right/top/front incoming lines, and a convenient insulation busbar cabinet connection.

2. Long-Life Maintenance-Free Design

Standard 3-position SF₆ load switch integrates load breaking, isolation, and grounding functions; the SF₆ gas tank has a sealed service life of up to 10-15 years, with a high mechanical life of the spring mechanism, resulting in extremely low overall maintenance costs. The gas tank is equipped with a pressure gauge to monitor SF₆ pressure, the panel features a mimic diagram and position indicator, with optional live display, and reliable operation interlocking to prevent misoperation.

3. Flexible Adaptability

Optional load switch-fuse combination or vacuum circuit breaker to meet different protection needs; supports non-standard customization, allowing cabinet size, material, and internal component configuration to be customized according to drawings or requirements, suitable for diverse indoor/outdoor scenarios.

4. Compatibility with Power Distribution Automation

Can integrate sensing and protection modules, supports remote monitoring, ideal for power distribution automation retrofitting, and widely used in urban distribution networks, industrial and mining enterprises, high-rise buildings, wind and solar PV grid connection, and other places with high requirements for power supply reliability.

XGN15-12 | 12kV SF6 Gas Insulated Ring Main Unit

Frequently Asked Questions (FAQ)

1. What is the difference between the XGN15-12 RMU and traditional Air Insulated Switchgear (AIS)?

A: Compared to traditional AIS, the XGN15-12 RMU is more compact, saving up to 40% on installation space. Its fully sealed gas insulation provides higher safety, is maintenance-free, and significantly reduces long-term operating costs.

2. Is the XGN15-12 suitable for both ring and radial networks?

A: Yes. Its modular design supports both configurations, allowing it to flexibly adapt to different network topologies.

3. What is the SF6 gas pressure?

A: The units are factory pre-filled to 0.04–0.06 MPa, with a hermetically sealed design that ensures a lifetime of no gas refilling.

4. Can it integrate with a vacuum circuit breaker?

A: Yes. A breaker module can be added to the RMU for applications like transformer protection.

5. What is the cabinet's protection level?

A: The cabinet has an IP3X protection rating, while the SF6 gas tank has an IP67 rating, ensuring maximum protection from the external environment.

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📞 Contact Engineer: Thor