Details.
SVI solid insulated switchgear (SF6 free switchgear) is KEMA type tested and suitable for medium voltage power distribution systems with a rated voltage of less than 12kV and a rated current under 1250A.
Application Area
Using patented technologies such as solid insulation, solid sealed poles and a fully insulated modular busbar, the solid insulated ring main unit suits ring and radial distribution networks with various wiring schemes. The solid insulated switch unit is also used as a demarcation switch, as the high-voltage switch in box-type substations, in KYN28 cabinets, in XGN fixed cabinets and in other applications, especially where SF6-free equipment is required. Intelligent terminal equipment connected to the switch unit allows real-time remote monitoring and control, improving the intelligence and reliability of the distribution network.
Product Features
- Unlike gas insulated switchgear, it contains no SF6, so no pressure tank is needed.
- All live parts are sealed or embedded in the epoxy resin and silicon rubber, fully insulated and wholly enclosed structure, safety protection level: IP67.
- All operating mechanism sealed inside a box, truly maintenance-free.
- Enhanced phase separation design, independent phase insulation to avoid the fault between phases.
- Standard modular design to facilitate unit extension, modification and replacement.
- Switch working position of each phase could be observed independently.
- Safe, smart, environment-friendly, flexible assembly enabled, good performance to apply in special environments.
- Multiple mechanical interlock to achieve ‘five-protection’ function.
- Complete indoor & outdoor switchgear application solution
Multi-Environment Application
Coastal area: fully sealed structure of the mechanism, professional high salt spray testing equipment to ensure long-term application in coastal areas.
Low temperature area: The solid insulated switchgear doesn’t need SF6, so the potential problem caused by insulation gas liquefying at low temperature is avoided.
Plateau area: Due to the absence of SF6, the problems caused by the big pressure difference between the inside and outside of the gas tank in high altitude areas are avoided.
Explosion-hazard areas: The switch adopts vacuum interrupter sealed with epoxy resin bushing which can prevent the gas exposure and explosion.
Basement with workers: The density of SF6 is 5 times higher than air on the same condition. So if the SF6 in a traditional RMU leaks out, it accumulates in low areas, where workers could be harmed or suffocated.
Frequent switching operation situation: The solid dielectric RMU is rated for 20,000 switching operations.
Areas with high requirements for environmental protection: Our solid insulated switchgear doesn’t contain SF6, which is a kind of greenhouse gas.
Windy and sandy area: The IP rating of the live parts reaches IP67. The control circuit compartment is specially treated, so it can work in windy and sandy areas.
High temperature environment: Suitable for high-temperature areas; the maximum normal operating temperature is 70 ℃. A high-temperature environmental test has been performed.
Structure Diagram
- Cable Compartment
- Viewing Window
- Circuit Breaker Open knob
- Circuit Breaker Close knob
- Switch Status (Close and Open) Indicator
- Energization Indicator
- Charging Indicator for Circuit breaker
- Charging Operation Hole for Circuit breaker
- Disconnector Operation Hole
- Short-circuit and Earth Fault Indicator
- Secondary Compartment
- Cable Compartment Viewing Window
Parameters
| Parameter Title | Unit | Load Switch | Load Switch +Fuse | Vacuum CircuitBreaker | Disconnector | Earthing Switch |
|---|---|---|---|---|---|---|
| Rated Voltage | kV | 12 | 12 | 12 | 12 | 12 |
| Arc Quenching | - | Vacuum | Vacuum | Vacuum | - | - |
| Rated Current | A | 630 | 125 | 630/1250 | 630/1250 | 630/1250 |
| Rated Frequency | Hz | 50 | 50 | 50 | 50 | 50 |
| Main Circuit Resistance | μΩ | ≤120 | 300 Note1 | ≤120 | - | - |
| Power Frequency Withstand Voltage Between Phases, Phase to earth/open contacts | kV | 42/48 | 42/48 | 42/48 | 42/48 | 42/48 |
| Lightning Impulse With stand Voltage Between Phases,Phase to earth/open contacts | kV | 75/85 | 75/85 | 75/85 | 75/85 | 75/85 |
| Rated Short-circuit Breaking Current | kA | 31.5 Note2 | 20/25/31.5 | |||
| Rated Short-circuit Breaking Times | times | 30 | ||||
| Rated Short-circuit Making Current | kA | 50 | 50/63 | |||
| Rated Short-circuit Making Times | times | 5 | 5 | |||
| Rated Short-time Withstand Current | kA/4s | 20 | 20/25 | 20/25 | 20/25 | |
| Rated Peak Withstand Current | kA | 50 | 50/63 | 50/63 | 50/63 Out | |
| Out-of-phase Earth Fault BreakingCurrent | kA | 17.3/21.7 | ||||
| Rated Cable Charging BreakingCurrent | A | 10 | 10 | |||
| Rated Take-over Current | A | |||||
| Internal Arc Test(AFLR) | KA/s | 20KA/0.5s (Include busbar room, switch room, cable tank) | ||||
| Partial Discharge | pC | ≤5 | ≤5 | ≤5 | ||
| IP Rating | IP67 | IP67 | IP67 | |||
| Mechanical Endurance | times | 10000 | 10000 | 10000 | 3000 | 300 |
