Medium Voltage SF6 Gas Insulated Ring Main Unit 24kV
Key attributes
| Brand | ROCKWILL |
| Series | RMR |
| Rated Voltage | 24 kV |
| Rated Current | 1250 A |
| Power Frequency Withstand Voltage | 65 / 79 kV |
| Rated Frequency | 50/60 Hz |
Description
This 24kV SF6 gas insulated RMU is medium voltage primary distribution switchgear. SF6 acts as insulation and arc-extinguishing medium. All live components and busbars are fully sealed in stainless steel gas tanks.
The gas tank reaches IP67 protection grade and the cabinet reaches IP4X. Equipped with standard 5-type anti-misoperation interlock and independent pressure relief channels to prevent misoperation and internal arc hazards.
Fixed and extendable modular designs are optional, supporting front and side cable wiring. Electric operation and remote monitoring modules can be equipped for smart grid construction.
Core Features
Stable SF6 Insulation：Pass IEC 62271-200 dielectric tests. Filling pressure 0.04MPa under 20 degree Celsius, annual gas leakage no more than 0.01 percent.
Compact Modular Design：Supports ring and radial power distribution, flexible wiring for compact substations and industrial projects.
Full Safety Protection：Anti-misoperation interlock, IP67 sealed tank and pressure relief duct. Optional SF6 leakage monitor, compliant with IEC 62271-1 safety standards.
Long Maintenance-free Lifespan：Sealed tank isolates dust and moisture. Max 10000 cycles for circuit breakers/load switches and 3000 cycles for disconnectors/earthing switches, over 20 years maintenance-free service.
Excellent Short-circuit Resistance：1250A rated current at 50/60Hz, with 25kA breaking current, 25kA 4-second short-time withstand current and 63kA making current, up to 30 breaking cycles.
Eco & Cost Efficient:Recyclable SF6 gas with low power consumption to reduce full-lifecycle operating costs.
Main Technical Parameters
| Item | Parameter with Unit |
|---|---|
| Rated Voltage | 24 kV |
| Rated Current | 1250 A |
| Rated Frequency | 50/60 Hz |
| Power Frequency Withstand Voltage (phase-phase & earth / breaking gap) | 65 / 79 kV |
| Lightning Impulse Withstand Voltage (phase-phase & earth / breaking gap) | 125 / 145 kV |
| Rated Short-circuit Breaking Current | 25 kA |
| Rated Allowable Short-circuit Breaking Cycles | 30 cycles |
| Rated Short-time Withstand Current & Duration | 25 kA for 4 s |
| Rated Short-circuit Making Current | 63 kA |
| Protection Grade | Outer enclosure: IP4X, SF6 gas compartment: IP67 |
| Rated Gas Filling Pressure under 20 degree Celsius | 0.04 MPa |
| Annual Gas Leakage Rate | No more than 0.01 pe |
Normal Service Conditions
Applicable altitude: 1000 to 4000 meters
Ambient temperature: minus 40 degree Celsius to plus 45 degree Celsius
Relative humidity: daily average no more than 95 percent, monthly average no more than 90 percent
Seismic resistance: withstand Grade 8 earthquake intensity
Isolation circuit breaker cabinet Scheme
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