Ring Main Unit (RMU) – Reliable and Efficient Power Distribution
Ring Main Unit (RMU) is a compact, gas-insulated switchgear solution designed for medium-voltage power distribution networks. It ensures safe, reliable, and efficient electrical power distribution in urban, industrial, and renewable energy applications. RMUs are widely used in ring networks and radial distribution systems, offering flexibility and enhanced power reliability.
RMUs are typically gas-insulated (GIS) using SF₆ or environmentally friendly alternatives to ensure high dielectric strength and insulation performance. They are designed with multiple switching functions, including circuit breakers, load break switches, and fuses, enabling effective fault isolation and restoration of power with minimal downtime.
Advantages of Ring Main Unit:
- Compact & Space-Saving: Designed for limited space applications, making it ideal for urban and industrial installations.
- Enhanced Safety: Fully enclosed, gas-insulated compartments provide protection against electrical faults and environmental conditions.
- Reliable Power Supply: Allows easy integration into looped networks, ensuring continuous power distribution even during maintenance.
- Low Maintenance: Minimal moving parts and gas insulation reduce maintenance needs and extend equipment lifespan.
- Flexible Configuration: Available in various designs to meet different voltage levels and power distribution requirements.
Applications of RMU: Ring Main Units are widely used in substations, commercial buildings, renewable energy systems, and industrial power grids. Their modular and adaptable design makes them an essential component in modern power distribution infrastructure.
With advanced protection features, robust performance, and high operational efficiency, Ring Main Units (RMU) provide an optimal solution for ensuring stable and uninterrupted medium-voltage power distribution.
XGN66-12 Ring Main Unit
Product Overview
XGN66-12 Ring Main Unit (RMU) is a compact and modular high-voltage switchgear designed for 12kV power distribution networks. Its small footprint makes it ideal for space-constrained installations in industrial, commercial, and utility sectors. Built for reliability, it offers long-term stable performance with minimal maintenance.
The fully enclosed design ensures high safety standards, protecting operators from live components while providing arc fault containment. It is also adaptable to different configurations, allowing customization based on voltage and network requirements.
Usage Conditions
Operates in temperatures between -15°C and +40°C and at altitudes up to 1000m. Suitable for environments free from fire hazards, explosive gases, and excessive pollution. It withstands seismic activity up to Level 8 and maintains stable operation in humid conditions.
Technical Specifications
Rated Voltage: Available in 3.6kV, 7.2kV, and 12kV.
Rated Current: 630A and 1250A options.
Short-Circuit Breaking Capacity: Up to 31.5kA.
Withstand Voltage: 42kV power frequency, 75kV lightning impulse.
Protection Level: IP3X for enhanced dust resistance.
Cabinet Dimensions: 900mm × 1000mm × 2200mm.
Advanced Features
Designed for smart grid applications, the XGN66-12 RMU supports remote monitoring and automation, ensuring seamless integration with modern power management systems. Its modularity allows easy expansion, making it a future-proof solution for growing energy demands.
XGN2-12 Ring Main Unit
Product Overview
The XGN2-12 Ring Main Unit (RMU) is a compact, metal-enclosed switchgear designed for 3.6kV, 7.2kV, and 12kV power distribution systems operating at 50Hz. It is widely used in substations, industrial facilities, and infrastructure projects where efficient and reliable electrical distribution is required. With its modular design and advanced protection mechanisms, the XGN2-12 RMU ensures safety, flexibility, and ease of maintenance.
This switchgear features a fully enclosed structure that enhances personnel safety by preventing accidental contact with live parts. It complies with international standards such as IEC298 and GB3906, offering a robust solution for modern power networks.
Usage Conditions
- Ambient Temperature: Maximum +40°C, Minimum -5°C
- Altitude: Not exceeding 1000m
- Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%
- Seismic Intensity: Not exceeding Level 8
- Environmental Conditions: Free from fire hazards, explosion risks, severe pollution, and chemical corrosion.
Technical Parameters
| No. | Item | Unit | Technical Data |
|---|---|---|---|
| 1 | Rated Voltage | kV | 3.6, 7.2, 12 |
| 2 | Rated Current | A | 630-2500 |
| 3 | Maximum Operating Current | A | 630, 1000, 1250, 2000, 2500, 3150 |
| 4 | Rated Breaking Current | kA | 20, 31.5 |
| 5 | Rated Thermal Stable Current | kA | 20, 31.5 |
| 6 | Rated Dynamic Stable Current | kA | 50 |
| 7 | Rated Closing Current | kA | 50 |
| 8 | Thermal Stability Time | S | 4 |
| 9 | Protection Level | - | IP2X |
| 10 | Busbar System | - | Single Busbar / Single Busbar with Bypass / Double Busbar |
| 11 | Operation Mode | - | Electromagnetic / Spring Stored Energy |
| 12 | Dimensions (W x D x H) | mm | 1100 x 1200 x 2650 |
| 13 | Weight | kg | Below 1000 |
Key Features
- Modular Design: Allows for flexible expansion and configuration.
- Enhanced Safety: Fully enclosed compartments prevent accidental contact with live parts.
- High Reliability: Designed for stable operation with minimal maintenance.
- Advanced Protection: Equipped with circuit breakers, relays, and monitoring systems.
- Compact Structure: Ideal for urban substations and industrial plants where space is limited.
Installation Requirements
Installation should be conducted following standard guidelines to ensure proper grounding and safe operation. The switchgear should be positioned on a stable base, with cable connections properly secured to prevent electrical faults.
Ordering Information
- Provide main circuit diagram and system configuration details.
- Specify protection requirements, relay settings, and automation needs.
- Indicate voltage ratings, current capacity, and short-circuit withstand levels.
- For special environmental conditions, consult with the manufacturer for custom solutions.
The XGN2-12 Ring Main Unit is an advanced solution for modern power distribution networks. With its high safety standards, modular structure, and reliable operation, it ensures efficiency and protection in various industrial and utility applications.
HXGN17-12 Ring Main Unit - Technical Parameters
HXGN17-12 Ring Main Unit (RMU) is a compact, modular, and highly reliable switchgear designed for 12kV power distribution. Its space-saving design makes it ideal for urban grids, industrial facilities, and power utilities. With high safety standards, the enclosed structure prevents accidental contact with live components, ensuring personnel and equipment protection. Additionally, the RMU features robust insulation and arc-resistant technology, enhancing its durability in demanding environments.
Key Features
- Compact & Modular: Space-saving design, ideal for urban and industrial applications.
- High Safety Standards: Fully enclosed compartments ensure protection from live components.
- Reliable Performance: Long lifespan with minimal maintenance requirements.
- Flexible Configurations: Can be customized based on voltage and network needs.
- Smart Grid Ready: Supports remote monitoring and automation for modern power management.
Technical Parameters
- Rated Voltage: 12 kV
- Power Frequency Withstand Voltage: 42 kV (Phase-to-Ground); 48 kV (Isolation Gap)
- Lightning Impulse Withstand Voltage: 75 kV (Phase-to-Ground); 85 kV (Isolation Gap)
- Rated Frequency: 50 Hz
- Rated Current: 630 A
- Breaking Current: 20/4 kA/S; Ground switch 20/2 kA/S
- Short-Circuit Making Current: 50 kA
- Fuse Model: S□LAJ-12
- Protection Level: IP2X
With long service life and minimal maintenance, HXGN17-12 RMU provides a highly durable and efficient power distribution solution. It is designed to operate in harsh environmental conditions, maintaining stable performance in fluctuating voltage networks. The unit supports remote monitoring and automation, making it adaptable for modern smart grid applications. Whether used in industrial complexes, commercial buildings, or utility substations, this RMU ensures reliable and safe power distribution.
XGN66-12 Ring Main Unit
XGN2-12 Ring Main Unit
