SF6 Gas-Insulated Metal-enclosed for Secondary Distribution RMU-12kV 24kV
Key attributes
| Brand | ROCKWILL |
| Model NO. | SF6 Gas-Insulated Metal-enclosed for Secondary Distribution RMU-12kV 24kV |
| Rated voltage | 24kV |
| Rated frequency | 50/60Hz |
| Series | RMR |
Description
The RMR series Ring Main Unit is designed, manufactured, and fully type-tested according to IEC 62271-200:2021.This RMR SF6 gas-insulated switchgear (GIS) is specifically engineered for secondary distribution networks. It integrates a compact design with high reliability, utilizing SF6 gas as the insulating medium to ensure stable performance in harsh environments.
Key Features
SF6 Gas Insulation: The superior dielectric properties of SF6 gas within the RMR series ensure excellent insulation performance. It can withstand high voltages and significantly reduce the risk of flashovers, even in humid or dusty conditions.
Compact & Space-Saving: Featuring a slimmer cabinet design compared to traditional air-insulated switchgear, it saves up to 40% in installation space—making it perfect for urban areas with limited room.
High Reliability for Ring Networks: Optimized for ring main unit topologies, this switchgear supports looped power supply architectures and rapid fault isolation, thereby minimizing downtime in secondary distribution systems.
Low Maintenance: The hermetically sealed gas enclosure strictly limits leakage risks (≤ 0.1% per year) and drastically extends maintenance intervals, lowering long-term operational costs.
Enhanced Safety (AFLR): Equipped with internal arc protection (AFLR) and comprehensive mechanical interlocking mechanisms, it actively prevents unauthorized or incorrect operations, ensuring maximum personnel and equipment safety.
Parameters
| Parameter Item | Unit | 12kV Configuration | 24kV Configuration |
|---|---|---|---|
| Rated Voltage (Ur) | kV | 12 | 24 |
| Power Frequency Withstand Voltage (Ud) (Ph-Gnd) | kV | 28 | 50 |
| Power Frequency Withstand Voltage (Ud) (Across Isolation) | kV | 32 | 60 |
| Lightning Impulse Withstand Voltage (Up) (Ph-Gnd) | kV | 75 | 125 |
| Lightning Impulse Withstand Voltage (Up) (Across Isolation) | kV | 85 | 145 |
| Rated Normal Current | A | 630 | 630 |
| Rated Short-time Withstand Current (3s) | kA | 25 | 20 |
| Rated Peak Withstand Current | kA | 63 | 50 |
| Annual Leakage Rate of SF6 | % | ≤ 0.1 | ≤ 0.1 |
Environmental Conditions
Ambient Temperature: -25°C to +40°C (Indoor Class)
Altitude: ≤ 1000m (Standard per IEC 62271-1; Ka correction for higher altitudes)
Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%
Design Life: 30 years
Solutions for RMU
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Rockwill Medium-Voltage SF6-Free Gas-Insulated Switchgear Series – From RMR to REC and RARWithin Rockwill's SF6-free product portfolio, the RMR, REC, and RAR series all adopt gas-insulated, hermetically sealed structures that fully enclose high-voltage live parts in stainless steel tanks, ensuring complete sealing and maintenance-free operation. The three series share a similar modular design philosophy, but differ significantly in insulation medium, technical positioning, voltage coverage, and application scenarios.Core DifferencesIn terms of insulation medium and environmental char
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