Outdoor Ring Main Unit
OMR outdoor Ring Main UnitThe OMR Ring main unit is with option for different appl…
Outdoor Ring Main Unit

Outdoor Ring Main Unit

Detailed description

  • Description
  • Technical data

OMR outdoor Ring Main Unit

The OMR Ring main unit is with option for different application. as a extensible or non extensible RMU.

The OMR comprising of a Tee off vacuum circuit breaker and two fault-make load break ring switches contained within a common SF6 gas insulated stainless steel enclosure.

The OMR unit is suitable for both indoor and outdoor applications and can be used either as a freestanding unit or for mounting to a transformer, complying with IEC62271-200.

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.


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

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