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12kV-40.5kV SF6 GAS INSULATED
SF6 gas-insulated ring main unit is a new type of medium-voltage power distribution product, which can effectively realise the protection, monitoring and control of power-using equipment. It has the advantages of small footprint, safety and reliability, advanced design, flexible programme combination and strong applicability. It is mainly used in distribution stations, substations and box-type substations in load centres such as urban residential districts, high-rise buildings, factories and enterprises, boosting stations or converging stations of photovoltaic or energy storage projects, and boosting stations of decentralized wind power plants.
Product Features
Modularity: unit independence, high interchangeability, can be customised according to user requirements combination of programmes
Fully insulated: The main electrical circuit is hermetically sealed in an gas tank and externally connected by a fully enclosed cable plug
Safety and reliability: Complete mechanical and electrical interlocks to ensure operator safety
Efficient operation and maintenance: compact structure, small size, convenient for users to install
Operating life: adopting all new composite materials, with a service life of at least 30 years
Intelligent: adopting IT and OT technology, online real-time monitoring
Technical Parameter
| RMU Technical Specifications | |||||||
| General requirement | |||||||
| Voltage level (kV) | 12 | 17.5 | 24 | 36 | 40.5 | ||
| Rated normal current (A) | 630 | ||||||
| Insulation medium | SF6 | ||||||
| Service ambient temperature(℃) | -25 to +55 | ||||||
| Altitude (m) | ≤1000 | ||||||
| Relative humidity | ≤95% | ||||||
| Frequency (Hz) | 50/60 | ||||||
| Rated lightning impulse withstand voltage | Directly earthed(kV) | 75 | 95 | 125 | 170 | 185 | |
| Across disconnector(kV) | 85 | 110 | 145 | 195 | 215 | ||
| Rated power frequency withstand voltage | Directly earthed(kV) | 28/42 | 38 | 50 | 70 | 95 | |
| Across disconnector(kV) | 32/48 | 45 | 60 | 80 | 118 | ||
| Protection | Indoor | IP4X | |||||
| Outdoor(Non-extensible) | IP43 | ||||||
| Tank with HV parts | IP67 | ||||||
| Mechanical impact protection | IK07 (Indoor) IK10 (Outdoor) | ||||||
| Internal arc rating | AFLR(kA/1s) | 20/21/25 | |||||
| SF6 gas | Annual leakage rate（year） | ≤0.01% | |||||
| Filled pressure (at 20ºC)Bar | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| Minimum operating pressure (Bar) | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | ||
| Circuit breaker switch and Load break switch function | |||||||
| Rated short time withstand current(kA/s) | Main electrical circuit | Rated short-time withstand current（kA/s） | 20/3；21/3；25/2 | ||||
| Earth switch | Rated short-time withstand current（kA/s） | 20/3；21/3；25/2 | |||||
| Earth circuit | Rated short-time withstand current（kA/s） | 20/1；21/1；25/1 | |||||
| Rated peak withstand current | Main electrical circuit (kA) | 52；54.6；65 | |||||
| Earth switch (kA) | 52；54.6；65 | ||||||
| Earth circuit (kA) | 52；54.6；65 | ||||||
| Making and breaking | Rated short circuit breaking current (kA) | 20；21；25 | |||||
| Rated short circuit making（peak）current (kA) | 52；54.6；65 | ||||||
| Fused switch combinations function | |||||||
| Rated normal current (A) | 125 | ||||||
| Rated short-circuit breaking current(kA) | 31.5 | ||||||
| Mechanical/Electrical endurance class | |||||||
| LBS and CB Mechanical endurance class | Load break switch | M1 | |||||
| Circuit breaker | M2 | ||||||
| Earth switch | M1 | ||||||
| Fuse Combination Mechanical endurance class | Fused switch | M2 | — | M1 | — | — | |
| Earth switch | M1 | — | M1 | — | — | ||
| Electrical endurance class short circuit making | Load break switch | E2 | E2 | E1 | E3 | E1 | |
| Circuit breaker | E2 | E2 | E1 | E1 | E1 | ||
| Earth switch | E2 | E2 | E1 | E1 | E1 | ||
| Executive standards | IEC 62271-100、IEC 62271-102 、IEC 62271-103、IEC 62271-105、IEC 62271-1、IEC 62271-200、IEC 60255、IEC 60529、IEC 62271-206 | ||||||
| Declaration: This product is a custom class, special requirements can be customised according to customer requirements. | |||||||
