Product Description
iSafering SF6 insulated Ring Main Unit
Gas Insulated Ring Main Unit
iSafeRing is a SF6 insulated ring main unit for the secondary distribution network. iSafeRing can be supplied in 10 different configurations suitable for most switching applications in 12/24/36 kV distribution networks. As an option, iSafeRing can be delivered as extendable ring main unit.
Together, iSafeRing represent a complete solution for 12/24/36 kV secondary distribution networks.
Modularity and external busbar
All modules except the metering module and circuit-breaker module are only 325 mm wide.
Transformer protection
iSafering offers a choice between a switch fuse combination and circuit breaker with relay for transformer protection. The switch fuse combination offers optimal protection against short-circuits, while the circuit breaker with relay option offers better protection against low overcurrents. Circuit breaker with relay is always recommended for larger transformers.
Normal operation conditions
The rated characteristics of the switchgear are valid under the following ambient conditions:
minimum ambient temperature: - 25 °C
maximum ambient temperature: + 40 °C
For different temperature ranges, please contact your UNISUN sales representative.
Standards
iSafeRing/iSafePlus is tested according to following
IEC-standards:
IEC 62271-1/IEC 62271-100/IEC 62271-102/IEC 62271-103/IEC 62271-105/IEC 62271-200/IEC 60529:
SF6 insulated Ring Main Unit Outer assembly
Inner assembly
Technical data
iSafering SF6 insulated Ring Main Unit
Gas Insulated Ring Main Unit
iSafeRing is a SF6 insulated ring main unit for the secondary distribution network. iSafeRing can be supplied in 10 different configurations suitable for most switching applications in 12/24/36 kV distribution networks. As an option, iSafeRing can be delivered as extendable ring main unit.
Together, iSafeRing represent a complete solution for 12/24/36 kV secondary distribution networks.
| C - Cable switch module | F - Cable switch module | V - Cable switch module |
| D - Direct cable connection module | De - Direct cable connection module with earthing switch | M - Metering module |
Modularity and external busbar
All modules except the metering module and circuit-breaker module are only 325 mm wide.
Transformer protection
iSafering offers a choice between a switch fuse combination and circuit breaker with relay for transformer protection. The switch fuse combination offers optimal protection against short-circuits, while the circuit breaker with relay option offers better protection against low overcurrents. Circuit breaker with relay is always recommended for larger transformers.
Normal operation conditions
The rated characteristics of the switchgear are valid under the following ambient conditions:
minimum ambient temperature: - 25 °C
maximum ambient temperature: + 40 °C
For different temperature ranges, please contact your UNISUN sales representative.
Standards
iSafeRing/iSafePlus is tested according to following
IEC-standards:
IEC 62271-1/IEC 62271-100/IEC 62271-102/IEC 62271-103/IEC 62271-105/IEC 62271-200/IEC 60529:
SF6 insulated Ring Main Unit Outer assembly
 iSafering outer assembly | Upper front cover 1. Manometer 2. Nameplate module 3. Short circuit indicator 4. Capacitive voltage indication 5. Load break / earthing switch position indicator 6. Push buttons close/open operation 7. Charged spring indicator 8. Self-powered protection relay 9. Vacuum circuit-breaker position 10. Operation shaft 11. Padlock device Lower front cover 12. Nameplate switchgear 13. Fuse blown indicator 14. Disconnector / earthing switch position indicator 15. Capacitive voltage indication Cable compartment cover 16. Cable compartment cover standard 17. Cable compartment cover with inspection window 18. Support bar (removable) Side cover 19. Lifting lug 20. Operating handle (standard on right hand side) |
 | 1. Mechanism compartment 2. SF6 gas tank 3. Cable compartment 4. Pressure relief area |
Technical data
| SafeRing | C-module | F-module | V-module | ||||
| Switch disconnector | Earthing switch | Switch-fuse disconnector | Downstream earthing switch | Vacuum circuit-breaker | Earthing switch/ disconnector | ||
| Rated voltage | Kv | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 |
| Rated frequency 5) | Hz | 50/50/50 | 50/50/50 | 50/50/50 | 50/50/50 | 50/50/50 | 50/50/50 |
| Power frequency withstand voltage | kV | 28/38/50 | 28/38/50 | 28/38/50 | 28/38/50 | 28/38/50 | 28/38/50 |
| Lightning impulse withstand voltage | kV | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 |
| Rated normal current | A | 630/630/630 | 2001) | 200/200/200 | |||
| Breaking capacities: | |||||||
| active load | A | 630/630/630 | |||||
| closed loop | A | 650/650/650 | |||||
| off load cable charging | A | 140/140/140 | |||||
| off load transformer | A | 20/20/20 | |||||
| earth-fault | A | 205/160/160 | |||||
| earth-fault cable charging | A | 117/91/91 | |||||
| short-circuit breaking current | kV | see2) | 16/16/16 | ||||
| Making capacity | kV | 52,5/40/40 | 52,5/40/40 | see2) | 12,5/12,5/12,5 | 40/40/40 | 40/40/40 |
| Short time current 3 sec. 3) | kV | 21/16/16 | 21/16/16 | 16/16/16 | 16/16/16 | ||