Description

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.

Note:For short circuit breaking and peak current is based on Fuse plus combination of F module.

Technical data

No.	Item	Unit	C Module		V Module
No.	Item	Unit	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