Home > Ring Main Units > Ring Main Units

Ring Main Units > Ring Main Units

Ring Main Units

Ring Main Units

 

Features:
1.Flexible 
1)Modular structure,as many combinations/panels as possible
2)Both left and right sides extensible
3)Field assembling enabled
4)Motorization retrofit enabled
2.Safety
1)Single inspection window fitted for checking switch status
2)Multiple interlocking functions to prevent fault operation
3)Protection level of cabinet is IP67
4)Pressure relief device to guarantee worker and equipment safety
3.Compact and Modular Design
1)Dimensions for 12kV standard 3 units is 1000*1380*720
2)Modular design enables field assembling, especially good for application at location with small entrances: mining industry, wind farm, compact secondary substation
4.Applications under extreme conditions
1)Ambient temperature:-45℃ to 55 ℃
2)Altitude: ≤4000m
3)Humidity: daily average≤95%  monthly average≤90%
4)Earthquake intensity < 8
Main Technical Data
V---Circuit breaker cabinet
C---Load break switch cabinet
F---Load break switch and fuse combination 

Features:

1.Flexible 

1)Modular structure,as many combinations/panels as possible

2)Both left and right sides extensible

3)Field assembling enabled

4)Motorization retrofit enabled

2.Safety

1)Single inspection window fitted for checking switch status

2)Multiple interlocking functions to prevent fault operation

3)Protection level of cabinet is IP67

4)Pressure relief device to guarantee worker and equipment safety

3.Compact and Modular Design

1)Dimensions for 12kV standard 3 units is 1000*1380*720

2)Modular design enables field assembling, especially good for application at location with small entrances: mining industry, wind farm, compact secondary substation

4.Applications under extreme conditions

1)Ambient temperature:-45℃ to 55 ℃

2)Altitude: ≤4000m

3)Humidity: daily average≤95%  monthly average≤90%

4)Earthquake intensity < 8

Main Technical Data

V---Circuit breaker cabinet

C---Load break switch cabinet

F---Load break switch and fuse combination 

 

Item 

Unit 

Technical Data

 

C

F

V

Rated Voltage

kV

12(24)

Rated Current

A

630

125

630/1250

Rated Frequency

Hz

50

Rated power frequency withstand

 voltage 1 min

Phase  to phase

Phase to ground

kV

42(65)

Across Open Contacts

kV

48(79)

Rated lightning impulse withstand voltage

Phase  to phase

Phase to ground

kV

75(125)

Across Open Contacts

kV

85(145)

Thermal stable current (RMS)

Main circuit

kA

20

/

20/25

Earthing switch

20

/

20/25

Earth return

17.4

/

17.4/21.8

Stable current(peak)

Main circuit

kA

50

/

50/63

Earthing switch

50

/

50/63

Earth return

43.5

/

43.5/54.8

Rated short circuit closing current (peak)

Load switch

kA

50

/

50/63

Earthing switch

50

/

50/63

Rated short-circuit breaking current

 

kA

/

31.5

20/25

Mechanical life

Circuit breaker

times

/

20000

Load switch

5000

/

Disconnector

3000

3000