What is 35kv gas insulated ring main unit(rmu)?

Gas insulated ring main unit (RMU) is a type of compact switchgear unit used in medium voltage distribution networks. It is designed to provide reliable and efficient distribution of electrical power in urban and industrial areas. The 35kV gas insulated RMU is a crucial component in the distribution network, offering a range of features and advantages that make it a popular choice for power distribution applications.

Working Principle:

The 35kV gas insulated RMU operates on the principle of gas insulation, where the electrical components are enclosed in a sealed metal enclosure filled with a high dielectric strength insulating gas such as sulfur hexafluoride (SF6). This gas provides excellent insulation properties, allowing for compact design and efficient operation of the RMU. The gas insulation also ensures that the unit is highly resistant to environmental factors such as moisture and dust, making it suitable for outdoor installation.

Product Features:

The 35kV gas insulated RMU is designed with a range of features to ensure reliable and safe operation. These features include:Compact design: The RMU is designed to occupy minimal space, making it suitable for installation in urban areas with limited space availability.Modular construction: The RMU is constructed with modular components, allowing for easy installation, maintenance, and expansion of the unit.High reliability: The gas insulation and sealed enclosure provide high reliability and long service life, ensuring continuous operation in demanding environments.Safety features: The RMU is equipped with more than just safety interlocks, pressure relief devices, and other safety features. It's a comprehensive safety system designed to protect personnel and equipment in case of internal faults or external disturbances, providing a reassuring level of safety and reliability. Technical Parameters:

The 35kV gas insulated RMU is available in various configurations and specifications to meet the specific requirements of different distribution networks. Typical technical parameters include:Rated voltage: 35kVRated current: Up to 630AShort-circuit withstand capacity: Up to 25kAInsulation level: Up to 125kVOperating temperature: -25°C to +40°CInstruction:

The installation and operation of the 35kV gas insulated RMU should be carried out in accordance with the manufacturer’s instructions and relevant industry standards. Proper training and certification of personnel involved in the installation, operation, and maintenance of the RMU are essential to ensure safe and efficient operation.

Structure:

The 35kV gas insulated RMU typically consists of the following main components:

Circuit breaker: To interrupt the current flow in case of faults or maintenance.

Load break switch: To isolate and connect the distribution feeders.

Busbar: To distribute the electrical power to the connected loads.

Earthing switch: To provide a safe grounding path for the RMU during maintenance or fault conditions.

Control and protection system: To monitor and control the operation of the RMU and provide protection against overloads, short circuits, and other faults.

Internal Components:

The internal components of the 35kV gas insulated RMU are designed and arranged to ensure efficient and reliable operation. These components include:

SF6 gas-filled enclosure: To provide insulation and protection for the internal components.

Circuit breaker mechanism: To open and close the circuit under normal and fault conditions.

Current and voltage sensors: To monitor the electrical parameters and provide feedback to the control system.

Control and protection devices: To monitor and control the operation of the RMU and provide protection against faults.

Advantages:

The 35kV gas insulated RMU offers several advantages over conventional air-insulated switchgear, including:

Compact design: The gas insulation allows for a compact and space-saving design, making it suitable for installation in urban areas with limited space availability.

High reliability: The sealed enclosure and gas insulation provide high reliability and long service life, reducing the risk of outages and maintenance requirements.

Environmental resistance: The gas insulation makes the RMU highly resistant to environmental factors such as moisture, dust, and pollution, ensuring reliable operation in harsh outdoor environments.

Safety: The RMU is equipped with safety features to protect personnel and equipment in case of internal faults or external disturbances, ensuring safe operation.

Application:

The 35kV gas insulated RMU finds wide applications in medium voltage distribution networks. It is particularly useful in urban distribution networks, industrial facilities, and renewable energy projects. Its versatility and reliability make it a suitable choice for various power distribution requirements.

Urban distribution networks: To provide reliable and efficient distribution of electrical power in urban areas with high population density and limited space availability.

Industrial facilities: To supply power to industrial plants, manufacturing facilities, and commercial buildings with demanding power distribution requirements.

Renewable energy projects: To connect and distribute power from renewable energy sources such as solar and wind farms to the grid.

Introduction to Several Typical Models of Schneider, ABB, Siemens, and Other Brands:

Schneider Electric, ABB, Siemens, and other leading manufacturers offer a range of 35kV gas insulated RMU models with different specifications and features to meet the diverse requirements of distribution networks. Some typical models from these brands include:Schneider Electric: The RM6 model from Schneider Electric is a compact and modular gas insulated RMU designed for medium voltage distribution networks. It offers high reliability, safety, and environmental resistance, making it suitable for urban and industrial applications.ABB: The SafeRing/SafePlus model from ABB is a versatile gas insulated RMU with a compact design and advanced protection features. It is designed to meet the stringent requirements of modern distribution networks, offering high reliability and ease of installation.Siemens: The 8DJH model from Siemens is a high-performance gas insulated RMU designed for demanding applications in urban and industrial environments. It features advanced control and protection capabilities, making it suitable for critical power distribution requirements.These models from Schneider, ABB, Siemens, and other brands demonstrate the diverse range of options available in the market, allowing customers to select the most suitable gas insulated RMU for their specific requirements.

Conclusion

In conclusion, the 35kV gas insulated RMU is a critical component in medium voltage distribution networks, offering a range of features and advantages that make it a popular choice for power distribution applications. With its compact design, high reliability, and environmental resistance, the gas insulated RMU is well-suited for urban, industrial, and renewable energy applications. Leading manufacturers such as Schneider Electric, ABB, Siemens, and others offer a variety of models to meet the diverse requirements of distribution networks, providing customers with a wide range of options to choose from. Proper installation, operation, and maintenance of the gas insulated RMU are essential to ensure safe and efficient power distribution.