SF6 Gas Insulated Compact RMU Metal Enclosed Switchgear

The SF6 Gas insulated compact RMU metal enclosed switchgear is a complete power distribution unit that fully encloses high-voltage switching devices, busbars, grounding switches, and other core components inside a stainless steel gas tank filled with SF6 gas as the insulating medium.

This product is primarily used in 12kV/24kV power systems for ring main unit (RMU) applications or terminal power distribution.

What can it do? 

Simply put, it enables power distribution, switching, protection, and control. Specific functions include:

1. Making and breaking load current - normal line switching.

2. Making and breaking short-circuit current - in combination with fuses or circuit breakers, quickly cut off the circuit during faults to protect transformers and lines.

3. Isolation and grounding - provides a visible disconnection point and grounding function to ensure the safety of maintenance personnel.

4. Cable connection and protection - acts as an incoming/outgoing unit, providing overcurrent and short-circuit protection for cable lines.

Thanks to its fully sealed construction, this product is especially suitable for harsh environments (e.g., high altitude, humidity, salt spray, heavy dust) or land-constrained locations (e.g., commercial centers, residential complexes, wind farms). It is an ideal replacement for traditional air-insulated ring main units.

Product Parameter (Specification)

The following are the standard technical parameters of the SF6 Gas insulated compact RMU metal enclosed switchgear manufactured by Lugao Power Co., Ltd.:

Product Feature And Application (Q&A Format)

Q1: What is the biggest feature of this SF6 Gas insulated compact RMU metal enclosed switchgear?

A: The biggest feature is extreme compactness and fully insulated design. Compared to traditional air-insulated RMUs, our product reduces volume by approximately 70% while maintaining superior electrical performance. All high-voltage live parts are completely sealed inside a stainless steel gas tank, unaffected by external condensation, pollution, or small animals---truly achieving 30 years of maintenance-free operation. Additionally, our SF6 insulated ring main unit features a modular design, allowing flexible combination of incoming/outgoing units, metering units, PT units, etc., according to user requirements.

Q2: How reliable is it in harsh environments?

A: Extremely reliable. The gas tank is manufactured using laser welding and helium leak detection, with an annual leak rate below 0.1%, ensuring long-term SF6 gas pressure stability. Even at -40°C extreme cold or +55°C high temperature, or at altitudes up to 3000 meters, our product maintains its rated insulation level. Many customers have installed this compact RMU switchgear in coastal wind farms and mines, where it has operated for years without any insulation flashover incidents.

Q3: What safety designs does the product have?

A: Safety is our top priority. The product features a “five-prevention” interlock system (prevents incorrect circuit breaker operation, prevents switching isolators under load, prevents closing the grounding switch when live, prevents energizing with ground closed, and prevents entering live compartments). Additionally, the gas tank has an internal arc fault rating of IAC AFLR 20kA/1s, with pressure relief channels directing arc energy to a safe area outside the enclosure. An observation window on the operation panel provides a clear view of the isolation gap status.

Q4: What specific application scenarios is it suitable for?

A: Our product is widely used in the following scenarios:

● Urban residential complexes, commercial buildings---as main incoming and distribution units in substations, saving floor space.

● Wind farms, photovoltaic power stations---as RMU units inside compact substations, withstanding temperature variations.

● Industrial parks, factories---protecting small and medium-sized transformers, replacing traditional dropout fuses.

● Subways, tunnels, airports---high-reliability power supply nodes requiring low failure rates.

● Data centers---A-level loads with extremely high requirements for supply continuity, enabling automatic standby power transfer with automation.

● Mines, ports---dusty, humid environments where fully sealed construction is a clear advantage.

Whether you need one or hundreds of units of SF6 Gas insulated compact RMU metal enclosed switchgear, we can provide standardized or customized solutions.

Production Details (Advantages Over Competitors)

Detailed Comparison: Lugao Power vs. Ordinary Brands

Our Core Differentiating Advantages:

1. Truly “maintenance-free”: Ordinary brands claim maintenance-free but have annual gas leakage rates >1%, requiring refilling every 3-5 years. Lugao Power uses a double-seal ring + metal hard-seal structure with an annual leakage rate ≤0.1% – no refilling needed within design life.

2. Extreme environment adaptability : Our product has passed -45°C low-temperature and +60°C high-temperature type tests, and 720-hour salt spray testing (ordinary = 96 hours) – suitable for coastal and alpine regions.

3. User-friendly operation : Switch positions, grounding status, and open/closed states are all color-coded on the panel, and the operating handle provides force feedback to prevent misoperation.

4. Higher short-circuit withstand capability : Standard requires 20kA/3s; we design with a margin of 25kA/3s and peak withstand of 63kA --- exceeding industry averages by 15%.

Frequently Asked Questions (FAQ)

Q1: Is the SF6 gas in this SF6 Gas insulated compact RMU metal enclosed switchgear environmentally friendly? Will it be phased out later?

A: Currently, SF6 remains the best insulating gas, but we have already developed eco-friendly versions (C4 or dry air). The gas tank of the unit you purchase is extremely well sealed, with minimal leakage over 30 years of operation. If an eco-friendly retrofit is needed in the future, we can provide a complete gas tank replacement service.

Q2: What should I do if the gas pressure drops during operation?

A: Our product comes standard with a gas density gauge (with low-pressure alarm contact). When the pressure drops to 0.25 bar (relative), an alarm signal is sent to the control system. At that point, a power outage should be requested, and our after-sales team will visit to check for leaks and refill SF6. Under normal circumstances, refilling due to leakage is almost never required.

Q3: Can the product be adapted to existing distribution automation systems?

A: Absolutely. Our SF6 gas in this SF6 Gas insulated compact RMU is reserved with DTU interfaces and space for electric operating mechanisms. By adding an electric module and control cables, it can be connected to IEC 60870-5-101/104 or Modbus communication protocols to achieve remote opening/closing, current/voltage reading, and fault indicator upload.

Why Choose Lugao Power?

Established in 2016：Lugao Power is a professional manufacturer of medium- and high-voltage power transmission and distribution equipment, with its own factory and integrated R&D, production, and sales capabilities.

3,000+ m² Manufacturing Facility：Our production facility supports the manufacturing, assembly, inspection, and testing of power transformers, RMUs, switchgear, and other power distribution equipment.

30+ Countries Served：Lugao Power products have been exported to more than 30 countries, serving power grid, industrial, infrastructure, renewable energy, and other international projects.

ISO9001 & SGS Certified：Our quality management and production processes are supported by ISO 9001 and SGS certifications. Applicable products are also available with CE and CCC certifications.

60+ Technical Staff：Our technical team supports product design, project configuration, customized solutions, and technical documentation for different power distribution requirements.

Factory-Direct Project Support：From product selection and technical design to manufacturing, testing, delivery, and after-sales support, Lugao Power provides integrated support for global power distribution projects.

Test Report / Certificate