| Brand | ROCKWILL |
| Model NO. | 14.4kV 12kV 15kV 24kV Pure air insulated Ring Main Unit (RMU)/ switchgear |
| Rated voltage | 24kV |
| Rated normal current | 630/800A |
| Rated frequency | 50/60Hz |
| 1min Power frequency withstand voltage | 60kV |
| Series | SM66 |
Description ：
Pioneer in China's eco-friendly switchgear sector, we have specialized in R&D and manufacturing of SF₆-free switchgear for decades. With core technologies, we have established industry standards. Boasting a fully independent end-to-end production chain, we have built a product matrix of zero-emission and high-reliability eco-friendly switchgear, making us a trusted choice for power grid construction.
SM66-12/24 unit type SF6 RMU with SF6 load switch as main switch, for whole cabinet is suitable for electric distribution automation and compact also expandable metal close switchgear. It characters in its simple structure, flexible operation, reliable interlocking and convenient installation etc., which can provide the satisfactory technical projects both for different application occasions and users. With the adoption of sensor technology and the protection relay up to date, plus the advanced technology and flexible assembly project, SM66-12/24 unit type SF6 RMU can completely meet the requirement of continuously variable market. It can take self-produced RLS-12/24 load break switch; also according to user's demand can be assembled with the internationally top-ranking RCB series vacuum circuit breaker with permanent magnetic mechanism made by AREVA or HD4 type SF6 circuit breaker made by AREVA or HD4 type SF6 circuit breaker made by ABB or with our VSC-12/24 type vacuum circuit breaker with permanent magnetic mechanism. Operational methods for the main switch inside ring main unit can be either manual or electric power driven. And It can meet the requirement of "Four Controls" when matched with FTU and RTU.
Technical feature:
Good Insulation Performance；
Strong Arc Extinguishing Ability；
High Safety；
Flexible and Reliable Operation；
Compact Structure and Modular Design；
High Degree of Intelligence.
Technology parameters:
The voltage classes of some of these eco-friendly switchgears include 6kV, 6.3kV, 6.6kV, 6.9kV, 7.2kV, 10kV, 10.5kV, 11kV, 11.5kV, 12kV, 13.2kV, 13.8kV, 14.5kV, 14.4kV, 15kV, 15.5kV, 15.6kV, 17.5kV, 20kV, 21.9kV, 22kV, 24kV, 30kV, 33kV, 33.5kV, 34.5kV, 35kV, 36kV, 38kV, 38.5kV, 40.5kV, 44kV, 45kV, 46kV, 66kV and 69kV. and customization is available.
No |
Item |
Unit |
Parameter |
|
1 |
Rated voltage |
kV |
12 |
24 |
2 |
Rated frequency |
Hz |
50/60 |
|
3 |
Rated current |
A |
630 |
800 |
4 |
1min Power frequency withstand voltage |
kV |
48 |
60 |
5 |
Lightning impulse withstand voltage |
kV |
75 |
125/150 |
6 |
Rated short circuit breaking current (peak) |
kA |
80 |
63 |
7 |
Rated active load/close circuit breaking current |
A |
63 |
50 |
8 |
Rated transferring current |
A |
1700 |
1200 |
9 |
Rated short circuit making current (peak) |
kA |
80 |
63 |
10 |
Rated cable(line) charging breaking current |
A |
50 and 10 |
|
11 |
Cable charge breaking current in earthing fault |
A |
20 |
20 |
12 |
Rated withstand current (peak) |
kA |
80 |
63 |
13 |
Short time withstand current (2s) |
kA |
31.5 |
25 |
14 |
Mechanism life |
times |
2000 |
Note: For short circuit breaking and peak current is based on Fuse plus combination.
Q:What is the purpose of a ring main unit RMU?
A:A ring main unit (RMU) is used to distribute electrical power in a medium - voltage distribution network. It allows for sectionalizing the network, isolating faults, and enabling power transfer between different sections of the ring - shaped power network, ensuring reliable power supply.
Q:What does the RMU stand for?
A：RMU stands for Ring Main Unit. It is a type of electrical switchgear used in medium-voltage electrical distribution systems, typically for distributing power in a ring circuit configuration.
