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36KV Environmentally Friendly Ring Main Unit
As an important RMU manufacturer and exporter in China, Cotenele has provided a large number of 36KV Environmentally Friendly Ring Main Unit products for distribution systems in Europe and South America for many years.These environmentally friend gas-insulated ring main units are widely used in urban distribution networks, industrial and commercial applications, transportation infrastructure construction, and other fields.The significant feature of these type of ring main units are that they do not contain any SF6 and uses dry air or nitrogen as the insulating gas, which is beneficial for protecting the environment.
Cotenele is a large manufacturer of the 36KV Environmentally Friendly Ring Main Unit (RMU) in China,and our medium- voltage RMUs have exported lots of countries and regions in Europe and American. The environmentally friendly gas-insulated ring main units are SF6 free,adopt dry air or N2 as insutating medium,is a alternative to traditional SF₆-insulated MV switchgears. An RMU houses medium-voltage switching devices in a metal-enclosed cabinet, primarily switching load currents, interrupting short-circuit currents, and no-load transformer currents.These medium-voltage switchgears and ring main units we produce complies with relevant international standards, such as: IEC 62271 series, EU F-gas Regulation (EU) 2024/573,IEEE/ANSI C37.20 series, UL/NEMA standards.
What is a 36KV Environmentally Friendly Ring Main Unit (RMU)?
A 36kV environmentally friendly gas-insulated ring main unit is a medium-voltage distribution switchgear assembly with a rated voltage of 36kV, using an environmentally friendly gas (as a substitute for SF₆) as the insulating medium, vacuum interruption technology for current breaking, and with all high-voltage live parts and switching elements hermetically sealed inside a stainless steel gas tank.
Key characteristics:
1. Rated voltage: 36kV (also covers 24kV, 40.5kV, etc., e.g., XGN-24/36)
2. Insulating medium: dry air, clean air, nitrogen, or low-GWP gas mixtures such as C4/CO₂ or C5/CO₂
3. Arc extinguishing method: vacuum interrupter
4. Construction: fully sealed stainless steel gas tank; protection rating up to IP67
5. Design standards: compliant with IEC and GB/T standards
6. In contrast to traditional SF₆ gas-insulated switchgear, the environmentally friendly version retains all advantages of Gas-Insulated Switchgear (GIS)—compact structure, maintenance-free operation, strong environmental adaptability—while completely eliminating the high-GWP SF₆ gas.
Application Scope:
The 36kV environmentally friendly gas-insulated ring main unit is mainly used in medium-voltage secondary power distribution systerm and terminal power supply scenarios.
1. Urban Distribution Networks:
This environmentally friendly gas insulated ring main unit is mainly used in urban distribution network ring network scenarios, switch stations, and cable distribution boxes.
2. Renewable Energy Generation:
- Wind farms : The 36 kV environmentally friendly RMU is particularly suitable for offshore and onshore wind farms. It is a very important connection point between wind turbines and the power grid, this will ensure safe and efficient power transmission, and can withstand high salinity, high humidity, and harsh marine environments.
- Photovoltaic (PV) plants : The 36kV environmentally friendly gas insulated RMU serves as the interface between the photovoltaic array and the grid, providing switch and protection functions, isolating the photovoltaic array for maintenance or troubleshooting, and managing the flow of current from the array to the grid.
3. Industrial and Commercial Applications:
The 36kV environmentally friendly gas insulated RMU is s very suitable for industrial enterprises, light industry, petrochemicals, data centers, large mines, airports, railways, commercial districts, high-rise buildings, and other substation and power distribution sites.
4. Transportation Infrastructure:
This environmentally friendly RMU can withstand harsh conditions such as vibration, corrosion, and humidity, which can ensure the safe and stable power supply of transportation infrastructure. Therefore, it is commonly used in power supply systems for highways, subways, rail transit, and envelope substations.
5. Special Environmental Applications:
All medium-voltage components of this 36kV environmentally friendly ring main unit are sealed in a metal casing filled with insulating gas, and their performance is not affected by external environmental factors. Especially suitable for high-altitude, severe cold, humid, and polluted environments, it is widely used in special harsh use scenarios such as high-altitude areas and offshore wind farms.
The main product advantages:
1. Environmentally friendly :This 36kV environmentally friendly gas-insulated ring main unit uses a gas mixture of dry air， N2 or low-temperature chamber gas emissions to eliminate greenhouse gas emissions of sulfur hexafluoride and support recyclability throughout its entire lifecycle.
2. Safe and reliable:This environmentally friendly ring main unit can withstand zero pressure (even at atmospheric pressure) and is equipped with a fully sealed IP67 stainless steel storage tank, which is not affected by moisture, salt spray, and pollution.
3. Compact and modular:This environmentally friendly ring main unit is very compact in size, with a single storage tank width as low as 420 millimeters, and expandable sides/tops for easy network upgrades.
4. Maintenance-free :The core components of this medium-voltage ring main unit do not require regular maintenance; Low circuit resistance can reduce energy loss and operating costs.
5. Intelligent:This 36kV environmentally friendly gas insulated ring main unit supports remote monitoring, SCADA integration, IoT sensors, and predictive maintenance based on artificial intelligence.
6. Strong environmental adaptability: This environmentally friendly ring main unit can operate stably within a temperature range of -40 ° C to+50 ° C, can work in environments up to 3000 meters above sea level, and can operate normally in harsh coastal or marine environments.
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Classification For Environmentally Friendly Ring Main Unit
| Classification Criteria | Types /Subtypes |
| By Insulating Medium | ·Dry air insulated(e.g.,ABB Safe Air,Schneider AirSeT;GWP=0) ·Clean air insulated(e.g.,XD Electric ZF68-40.5) · C4/CO₂ mixture(GWP reduced by~98%;e.g.,GE g³, S&C Vista) ·C5/CO₂mixture (e.g.,Siemens 8DJH;GWP reduced by 98%) ·Solid insulated(epoxy+silicone rubber;SF₆-free) |
| By Functional Unt Type | · Incoming unit(C-unit)-load switch ·Outgoing unit(F-unit)-load switch +fuse ·Circuit breaker unit(V-unitt)-vacuum CB(upper or lower isolation) ·Bus coupler unit(SVBR -unit) · Metering unit(M/PT-unitt) ·Cable connection module(D-unit) |
| By Application Environment | · Indoor type(IP41 or higher) ·Outdoor type(higher protection,for harsh environments) |
| By Structural Expansion Method | · Side-expandable ·Top-expandable ·Common tank type(width =370×n+50 mm,n≤5) |
| By Enclosure Method | ·Single gas tank type(each unit independent;width～420 mm) ·Common gas tank type(up to 5 units share one tank) |
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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