China 24kv Air Insulated Ring Main Unit

++++General
SM66

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, SM66-24 unit type SF6 RMU can completely meet the requirement of continuously variable market. It can take self-produced RLS-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-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.

++++Main technical specifications

No

Item

Unit

Parameter

1

Rated voltage

kV

24

2

Rated frequency

Hz

50/60

3

Rated current

A

630/800

4

1min Power frequency withstand voltage

kV

60

5

Lightning impulse withstand voltage

kV

125/150

6

Rated short circuit breaking current (peak)

kA

63

7

Rated active load/close circuit breaking current

A

50

8

Rated transferring current

A

1200

9

Rated short circuit making current (peak)

kA

63

10

Rated cable(line) charging breaking current

A

50 and 10

11

Cable charge breaking current in earthing fault

A

20

12

Rated withstand current (peak)

kA

63

13

Short time withstand current (2s)

kA

25

14

Mechanism life

times

2000