Solid Insulated RMU
Secure. Compact. Reliable. Built to Last, Designed to Fit.
- ODM/OEM Solutions
Tailored to your needs
At IE-Supply, we know that every power grid is different. That’s why we specialize in providing custom Solid Insulated RMUs and custom parts for Solid Insulated RMUs to fit your exact needs. Here’s how we can help:
ODM Solid Insulated RMUs: Our advanced ODM solutions cater to any specification up to 24 kV, ensuring compatibility with your existing systems and seamless integration into your network.
OEM Parts for Solid Insulated RMUs: Need to enhance or replace parts within your existing units? We offer OEM services that promise not just replacement but an upgrade to your current installations.
Solid Insulated RMU
| Parameter name | Significance |
|---|---|
| Rated voltage kV | 6(10) |
| Highest operating voltage, kV | 12 |
| Rated current, A | 630 |
| Rated tripping current, kA | 20 |
| Switching current, kA | |
| — highest peak | 51 |
| — effective value of periodic component | 20 |
| Through short-circuit current, kA | |
| — electrodynamic resistance current | 51 |
| — current-thermal resistance | 20 |
| Duration of thermal resistance current flow, s | |
| — main circuits | 3 |
| — grounding circuits | 1 |
| Test voltage of insulation of the fall circuit, kV | |
| — one-minute with respect to the ground, neighboring poles and on the contact break, frequency 50 Hz | 42 |
| — lightning pulse 1.2/50 μs | 75 |
| Mechanical life number of cycles "switching on - pause - switching off" without current in the circuit | |
| — disconnector | 3000 |
| — circuit breaker | 10000 |
| — load breaker | 10000 |
| Switching life of circuit breaker at rated tripping current | |
| — number of "O" operations | 25 |
| — including HE operations | 13 |
The Ultimate Guide of Solid Insulated RMU
Chapter 1
What is Solid Insulated RMU?
Chapter 2
Key features of Solid Insulated RMU
Chapter 3
Components of Solid Insulated RMU
Chapter 4
Advantages of Solid Insulated RMU
Chapter 5
Applications of Solid Insulated RMU
Chapter 6
Installation of Solid Insulated RMU
Chapter 7
Maintenance of Solid Insulated RMU
Chapter 8
What is the difference between Solid Insulated RMU and Solid Insulated Switchgear?
Chapter 9
Who is the manufacturer of Solid Insulated RMU?
Chapter 1
What Is Solid Insulated RMU?
A Solid Insulated Ring Main Unit (RMU) is a type of electrical switchgear. It is designed to distribute medium voltage power and to ensure the safety and reliability of electrical networks. Solid Insulated RMUs use solid insulation materials instead of SF6 gas as the insulating medium. The solid insulation materials provide dielectric insulation and arc quenching. This technology was developed to address the environmental concerns associated with SF6 gas, which is a potent greenhouse gas.
Chapter 2
Key Features Of Solid Insulated RMU
1. Environmentally friendly: Solid Insulated RMUs don’t use SF6 gas, so there’s no chance of gas leakage or environmental impact.
2. Compact Design: Solid insulation materials can be more compact than gas insulation, and still offer high dielectric strength, so the RMU’s footprint is smaller.
3. Maintenance-free: You don’t have to worry about gas handling, gas monitoring, or anything else related to gas-insulated equipment. It’s virtually maintenance-free.
4. Safe and reliable: Solid insulation is good at resisting electrical and mechanical stresses. It’s reliable in different climates and reduces the risk of internal arc faults.
5. Compliant: Solid Insulated RMUs meet international standards like IEC 62271, which covers the specifications for medium-voltage switchgear and controlgear assemblies. That means they work with electrical networks worldwide.
6. Versatile: You can use Solid Insulated RMUs for secondary distribution systems, compact substations, and renewable energy installations. They work indoors and outdoors because they’re built to last.
Chapter 3
Components Of Solid Insulated RMU
1. Main Enclosure: The enclosure is made of high-quality, durable materials like epoxy resin. It houses all the internal components and provides mechanical protection and electrical insulation.
2. Busbars: Busbars are made of copper or aluminum and are encapsulated in solid insulation material. They conduct electricity between different parts of the switchgear and to connected loads.
3. Load Break Switch: A load break switch is typically a rotary or a linear type switch. It makes or breaks the load current and provides isolation capabilities.
4. Circuit Breaker: A circuit breaker is typically vacuum or SF6-free technology. It provides protection by automatically cutting off power in case of an overload or fault.
5. Earthing Switch: An earthing switch can be manually operated or motorized. It connects the circuit to ground for safety and operational purposes.
6. Voltage Transformer (VT): A voltage transformer (VT) is either inductive or capacitive. It reduces high voltages to lower levels suitable for meters, relays, and other devices.
7. Current Transformer (CT): A current transformer (CT) measures the current flow in the circuit and provides a scaled-down value for meters and protective relays.
8. Protection Relays: Protection relays monitor electrical parameters and trip the circuit breaker if abnormal conditions are detected.
9. Control and Monitoring Panel: The control and monitoring panel includes user interfaces, control switches, and indication lights. It allows for manual control and provides status information about the operation of the RMU.
10. Cable Terminations: Cable terminations are connections for incoming and outgoing cables.
11. Auxiliary Services: Auxiliary services might include heating elements to prevent condensation and other auxiliary circuits for special applications.
Chapter 4
Advantages Of Solid Insulated RMU
1. Environmental Resistance: Solid Insulated RMUs are highly resistant to harsh environmental conditions. Unlike gas-insulated units that can be sensitive to moisture and air quality, solid insulation is unaffected by atmospheric conditions. This makes them particularly suitable for humid, dusty, or corrosive environments.
2. Safety: Safety is a big deal in electrical distribution, and solid insulated switchgear is excellent in this area. The solid insulation minimizes the risk of arc faults, which enhances operational safety and reduces the likelihood of fire hazards. This type of RMU is completely sealed, which eliminates risks associated with gas leakage—an issue pertinent to SF6 gas-insulated switchgear.
3. Compact Design: Solid Insulated RMUs have a compact and modular design, allowing for efficient use of space and easier installation in confined areas. This design flexibility is advantageous for urban infrastructure, industrial applications, and areas where space is at a premium.
4. Maintenance-Free: One of the big advantages of solid insulated technology is that it is virtually maintenance-free. This is because there are no gas-filled compartments that require regular gas monitoring, refilling, or leakage checks. This reduces the overall cost of ownership and operational costs over the equipment’s lifespan.
5. Eco-Friendly: Solid insulated RMUs are a sustainable solution because they don’t use SF6 gas, which is known to have a potential environmental impact as a greenhouse gas. So, if you’re trying to be eco-friendly, this is a better option.
6. Long Life: Solid dielectric material is very stable and durable. It lasts a long time because it doesn’t break down as quickly as other materials. It’s able to handle electrical stress and thermal variation better than other materials, so it lasts longer.
7. Reliable: Solid insulation materials tend to be good insulators. They don’t degrade as quickly as other insulating materials, and they perform consistently over a wide range of temperatures.
8. Less Electromagnetic Interference: Solid insulated switchgear emits less electromagnetic interference. That’s good because, in some installations, electromagnetic interference can mess up the operation of other sensitive equipment.
If you have any more specific queries or need advice tailored to your particular situation, feel free to ask!
Chapter 5
Applications Of Solid Insulated RMU
1. Urban Power Distribution:
Solid Insulated RMUs are used a lot in towns and cities. They’re small and don’t have SF6 gas, so they’re great for busy areas where there’s not much space and you need to be safe.
2. Industrial Sectors:
Solid Insulated RMUs are used in factories, processing plants, and big commercial buildings where you need the power to be on all the time. They’re strong and don’t need much looking after.
3. Renewable Energy Integration:
Because more people are using wind and solar power, Solid Insulated RMUs are being used to connect this power to the main electricity grid. They’re really good at keeping the energy in and making sure it goes where it needs to go.
4. Hospitals and Critical Infrastructure:
Hospitals, data centers, and telecommunication centers all need a reliable power supply. Solid Insulated RMUs are often used in these applications because they are reliable and can quickly respond to faults.
5. Compact Substations:
Solid Insulated RMUs are a great option for compact substations, especially in urban areas or places where you don’t want gas leaking. They are not affected by pollution, humidity, or temperature.
6. Railway Systems:
Solid Insulated RMUs are used for electrifying railway systems, such as metro lines and tram systems. They are chosen because they are safe, reliable, and easy to maintain, which is important for transportation.
Chapter 6
Installation Of Solid Insulated RMU
Pre-Installation Preparation
Site Inspection and Environment Check: Ensure the installation site is dry, free of dust, and well-ventilated. The site should be easily accessible for future maintenance and operation. Check for ambient temperature conditions to ensure they are within the equipment specifications, typically -25°C to +40°C.
Tools and Materials: Prepare all necessary tools and installation materials, including insulating gloves, voltage detectors, grounding cables, and mechanical fixing tools.
Delivery and Unpacking: Inspect the RMU upon delivery for any transport damage. Carefully unpack the unit, ensuring that all parts are accounted for and undamaged.
Installation Process
Placement and Positioning: Position the RMU on a flat, stable surface. If necessary, adjust the position to ensure proper alignment and leveling of the unit. Secure the RMU to the ground or platform to avoid any movement.
Cable Installation:
- Cable Preparation: Strip the cables according to the manufacturer’s specifications. Ensure that the insulation and conductors are intact and clean.
- Cable Connection: Connect the main cables to the RMU using specified torque settings for the connections. It’s crucial to follow the manufacturer’s guidelines to ensure a secure and reliable connection.
Grounding: Establish a robust grounding connection. This is critical for safety and the proper operation of the RMU. Use copper grounding cables and ensure that all connections are tight and corrosion-free.
Interlocking System Check: Verify the mechanical and electrical interlocking systems to ensure they function correctly. This prevents incorrect operations and enhances safety.
Commissioning And Testing
Insulation Testing: Perform insulation resistance tests using a megohmmeter to ensure that the insulation is intact and within specifications.
Circuit Testing: Conduct continuity tests on all circuits to ensure there are no open circuits or incorrect connections.
Functional Testing: Simulate operational conditions to test the functionality of the RMU, including the operation of switches and protection devices.
Final Inspection: Conduct a thorough inspection to ensure that all components are properly installed, connections are secure, and there are no signs of physical damage.
Documentation And Training
Documentation: Keep detailed records of the installation process, test results, and any adjustments made during installation. This documentation is crucial for maintenance and future reference.
Operator Training: Train the operational staff on the correct operation, maintenance, and safety procedures related to the RMU.
Chapter 7
Maintenance Of Solid Insulated RMU
1. Visual Inspections
- Frequency: Conduct visual inspections annually to check for any signs of physical damage, contamination, or unusual wear and tear.
- Key Points: Inspect the condition of the enclosure, bushings, and connections. Look for any signs of moisture ingress or dust accumulation which can affect the insulation properties.
2. Mechanical Operation Tests
- Frequency: Perform mechanical operation tests every 2-3 years.
- Procedure: Operate all mechanical components, including switches and circuit breakers, to ensure they move freely without excessive force or unusual noise. Verify the correct alignment and tightening of all mechanical linkages and connections.
3. Electrical Tests
- Frequency: Electrical integrity tests should be conducted every 5 years.
- Tests Include:
- Insulation Resistance Testing: Measure the insulation resistance using a megohmmeter to ensure that it is above the recommended threshold.
- Contact Resistance Test: Check the resistance of the circuit breaker contacts and connections to ensure they are within specifications to avoid overheating.
4. Cleaning
- Frequency: Clean the unit as needed, based on the environmental conditions.
- Method: Use dry, clean, lint-free cloths to clean the solid insulation surfaces. Avoid using any liquid cleaners unless specified by the manufacturer. Ensure that all ventilation paths are clear of obstructions.
5. Grounding Checks
- Frequency: Verify the integrity of grounding connections annually.
- Importance: Proper grounding is critical for safety and the correct operation of protective devices.
6. Thermographic Inspections
- Frequency: Conduct thermographic inspections every 2-3 years or more frequently in harsh environments.
- Purpose: Identify hot spots and potential points of failure in electrical connections and components due to loose connections or deterioration.
7. Software Updates And Diagnostics
- If your RMU is equipped with monitoring or diagnostic tools, ensure that the software is updated to the latest version and regularly check for diagnostic alerts.
8. Record Keeping
- Maintain detailed records of all maintenance activities, test results, and replacements. This documentation will help in trend analysis and planning future maintenance activities.
9. Training And Procedures
- Ensure that all personnel involved in the maintenance of the RMU are properly trained and follow safety protocols. Use only recommended tools and equipment for maintenance tasks.
Chapter 8
What Is The Difference Between Solid Insulated RMU And Solid Insulated Switchgear?
Solid Insulated Ring Main Units (RMUs)
Solid Insulated RMUs are compact switchgear systems commonly used in urban power distribution networks and medium voltage applications. They feature a ring formation in their circuit connectivity, making them ideal for ensuring continuous and reliable supply by allowing multiple sources to feed the system. Here are key characteristics:
- Insulation: They use solid and eco-friendly insulation materials, typically epoxy resin, which eliminates the need for SF6 gas, known for its greenhouse effects.
- Configuration: RMUs are typically configured in compact and enclosed systems that include load break switches and circuit breakers, designed for ring-type configurations in distribution networks.
- Application: Best suited for compact urban spaces, underground systems, and places where space and environmental impact are significant concerns.
- Maintenance: Solid insulation minimizes maintenance needs because it is less prone to environmental degradation and does not require gas handling.
Solid Insulated Switchgear
Solid Insulated Switchgear, on the other hand, encompasses a broader range of systems and can include more complex configurations than RMUs. It is designed for primary and secondary power distribution, offering a higher level of customization and capacity. Here are some distinguishing features:
- Insulation: Like RMUs, solid insulated switchgear uses solid insulation, often epoxy, which provides excellent dielectric strength and reduces physical footprint.
- Configuration: This type of switchgear can include more varied components such as disconnectors, circuit breakers, and measurement compartments, allowing for customization to specific project needs.
- Application: It is suitable for both primary and secondary distribution needs and can be tailored for specific voltages and configurations, making it versatile for industrial and large commercial applications.
- Maintenance and Longevity: Offers high reliability and longevity with minimal maintenance due to solid insulation.
Comparative Analysis
- Footprint and Space Usage: RMUs are generally more compact than solid insulated switchgear, making them suitable for space-constrained environments.
- Customization and Capacity: Solid insulated switchgear allows for greater customization and can handle higher capacities, making it suitable for a broader range of applications.
- Environmental and Safety Considerations: Both systems offer significant environmental benefits over traditional gas-insulated solutions, reducing the ecological footprint and enhancing safety due to their non-flammable insulation materials.
Understanding these differences can help you choose the right equipment for your specific electrical distribution needs. If you have more detailed requirements or need advice on specific products, let us know!
Chapter 9
Who Is The Manufacturer Of Solid Insulated RMU?
IE-Supply is the manufacturer of Solid Insulated RMU. At IE-Supply, we understand that your projects are unique. That’s why we offer tailored solutions for your most demanding electrical infrastructure challenges. Specializing in 10-35kV Solid Insulated RMU, our products are engineered to the highest standards—meeting the critical demands of industries across Russia, CIS countries, Southeast Asia, and the Middle East.
Your needs are specific, and our approach is too. From custom 2D and 3D designs provided at no extra cost to specialized production lines for Solid Insulated RMU, we ensure every product is crafted to your exact specifications. Whether you’re a contractor, company owner, or a large manufacturer like the State Grid Corporation of China or ABB, we tailor our solutions to fit seamlessly into your operations.
Partnering with industry giants has shaped our commitment to quality and value. We guarantee timely delivery, ensuring that your projects proceed without delay. With IE-Supply, elevate your electrical setups while adhering to budgets and timelines.
We Are Just A Phone Call Away.
You’ll have no problem talking to our sales team who speak Russian. They’ll understand exactly what you want and make sure you get it, which will make everything go faster and smoother.
- +86 135-8775-1570
- info@ie-supply.com