| Brand | ROCKWILL |
| Model NO. | SF6 Ring Main Unit Switchgear Source Manufacturer-24kV |
| Rated voltage | 24kV |
| Rated frequency | 50/60Hz |
| Series | RMR |
The SF6 gas-insulated switchgear RMR-24/630 is designed for medium-voltage power distribution systems with a rated voltage up to 24kV (25kV). It serves as a highly reliable Ring Main Unit (RMU) in power supply networks, providing fault isolation and sectionalizing capabilities. When equipped with smart distribution automation devices (FTU/DTU) and communication modules, it enables real-time monitoring and remote control for modern smart grids.
This product operates with a safe, fully sealed SF6 gas tank, ensuring a compact structure, longevity, and a maintenance-free lifecycle. It is in strict conformity with the international standard IEC 62271-105.
Robust Panel Enclosure: The main enclosure is constructed from 2mm aluminum-zinc-coated (Alu-Zinc) steel plates using multi-bending technology. This design ensures high mechanical strength, excellent corrosion resistance, and an aesthetically precise finish.
Top-Mounted Busbar Compartment: The main busbar compartment is securely located at the top of the unit, facilitating safe and efficient interconnections with adjacent modular panels to form a complete switchgear assembly.
SF6 Gas-Insulated Load Break Switch (LBS): The core switching unit features a highly reliable Load Break Switch housed within a hermetically sealed SF6 gas tank, ensuring excellent arc-quenching capabilities and a maintenance-free lifecycle.
Spacious Cable Compartment: Occupying approximately 75% of the lower cabinet volume, this generously sized compartment provides ample room for power cable terminations, as well as the installation of high-voltage fuses, earthing switches, and potential transformers (PT).
Mechanism & Interlocking System: The operating mechanism chamber houses precision actuators, mechanical interlocks, position indicators, auxiliary contact trip coils, and charge status indicators. These components work together to provide foolproof "5-prevent" safety interlocking, strictly adhering to IEC safety protocols.
Low-Voltage (LV) Control Chamber: Conveniently located at the top front of the panel, the LV chamber is isolated from high-voltage areas. It is designed for housing protective relays, metering instruments, and motorized control units, ensuring safe access for operators.
Circuit Breaker Integration (Optional): Depending on the specific RMR-24/630 configuration, an SF6 or Vacuum Circuit Breaker (VCB) can be integrated below the load break switch for enhanced short-circuit protection.
| Item | Unit | Parameter Value |
|---|---|---|
| Rated Voltage (Ur) | kV | 24 (25) |
| Power Frequency Withstand Voltage (Ph-Gnd / Across Isolation) | kV | 50 / 60 |
| Lightning Impulse Withstand Voltage (Ph-Gnd / Across Isolation) | kV | 125 / 145 |
| Rated Current | A | 630 |
| Active Load | A | 630 |
| Closed Loop | A | 670 |
| Off-load Cable Charging | A | 141 |
| Earth Fault | A | 160 |
| Earth Fault Cable Charging | A | 91 |
| Making Capacity | kA | 40 |
| Short-time Current (3 sec) | kA | 16 |
Altitude: ≤ 2000 m (For >1000m applications, insulation is subject to Ka correction per IEC 62271-1).
Temperature Range: -40°C ~ +55°C
Relative Humidity: Daily mean ≤ 95%, Monthly mean ≤ 90%
Gradation of Earthquake Damage: ≤ Level 8
Yes. When equipped with smart distribution automation devices (FTU/DTU) and communication modules, the RMR-24/630 enables real-time monitoring and remote control, making it suitable for modern smart grid deployments.
Yes. The fully sealed SF₆ gas tank ensures a compact, maintenance-free lifecycle. All high-voltage components are hermetically sealed, eliminating gas replenishment and internal inspection requirements throughout the designed service life.
The RMR-24/630 features a precision mechanism chamber housing actuators, mechanical interlocks, position indicators, auxiliary contacts, and charge status indicators. Together they provide foolproof "5-prevent" safety interlocking, strictly adhering to IEC safety protocols.
The main enclosure is constructed from 2mm Alu-Zinc coated steel plates using multi-bending technology, ensuring high mechanical strength, excellent corrosion resistance, and a precise finish. The LV control chamber is isolated from HV areas at the top front, ensuring safe access for operators. The top-mounted busbar compartment facilitates safe and efficient interconnection with adjacent modular panels.
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