++++General:
RMR is a ring main unit for the secondary distribution network. RMR can be supplied in 10 different configurations suitable for mostswitching applications in 12/24 kV distribution networks. It is extendable and combined with the SafePlus concept, which is ABB’s flexible, modular compact switchgear, they represent a complete solution for 12/24 kV secondary distribution networks. RMR and SafePlus have identical user interfaces. RMR is a completely sealed system with a stainless steel tank containing all live parts and switching functions. A sealed steel tank with constant atmospheric conditions ensures a high level of reliability as well as personnel safety and a virtually maintenance-free system. The RMR concept offers a choice of either switch-fuse combination or circuit-breaker with relay for protection of the transformer. RMR can be supplied with an integrated remote control and monitoring unit. This product is in conformity with the standards of IEC60420, GB/T11022, GB3804,GB3906
++++Service environment:
a) Air temperature:Maximum temperature: +40℃; Minimum temperature:-20℃
b) Humidity:Monthly average humidity 95%; Daily average humidity 90% .
c) Altitude above sea level:Maximum installation altitude: 2500m
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
++++ Standard instruction:
D unit configuration
See standard configuration and features of "Cable connecting module without earth switch module"
C unit configuration
See standard configuration and features of "Load break switch module"
F unit configuration
See standard configuration and features of "Load break switch and fuse combination module"
V unit configuration
See standard configuration and features of " Vaccum switch module"
++++Standard combinations also includes belowing configurations:
Voltage indicator of incoming bushing capacitive character SF6 density/pressure monitor( gas meter) with each gas cell Ring for lifting Operating handle.
++++Main technical specifications:
No. | Item | Unit | C Module | V Module |
Load break switch | Circuit breaker |
1 | Rated voltage | kV | 12 | 24 | 12 | 24 |
2 | Rated current | A | 630 |
3 | Rated frequency | Hz | 50/60 |
4 | 1min Power frequency withstand voltage | kV | 45 | 55 | 45 | 55 |
5 | Lightning impulse withstand voltage | kV | 75 | 125/150 | 75 | 125/150 |
6 | Rated transfer current | A | 1700 | 1400 |
|
7 | Rated active load and close circuit breaking current | A | 630 |
8 | Rated cable charge breaking current | A | 50&10 |
9 | Rated short circuit breaking current | kA |
| 20 | 16 |
10 | Rated short circuit making current(peak) | kA | 63 | 50 | 63 | 50 |
11 | Short time (2s) withstand current, load switch/earth | kA | 25/20 | 20/20 | 25/20 | 20/20 |
12 | Rated withstand current (peak) | kA | 63 | 50 | 63 | 50 |
13 | Mechanism life | Times | 3000 | 10000 | 3000 |
14 | Dimension ( per unit) | mm | 370x750x1345 |
Note:For short circuit breaking and peak current is based on Fuse plus combination of F module.
