SF6 insulated Ring Main Unit

UN-RMU SF6 insulated Ring Main Unit

Gas Insulated Ring Main Unit

from 6 to 40.5 kV, 630A

Description

SF6 insulated Ring Main Unit

 

Gas Insulated Ring Main Unit

SF6 insulated ring main unit for the secondary distribution network. UN-RMU can be supplied in 10 different configurations suitable for most switching applications in 12/24/36 kV distribution networks. As an option, UN-RMU can be delivered as extendable ring main unit.
Together, UN-RMU 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

UN-RMU 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

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

UN-RMU outer assembly

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)

 

Inner assembly

UN-RMU Inner assembly

Inner assembly

1. Mechanism compartment
2. SF6 gas tank
3. Cable compartment
4. Pressure relief area

 

SF6 insulated Ring Main Unit Module

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

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