24kV, RMU, Switchgear, GIS, SF6 Ring Main Unit, 110408

Item

Unit

C Unit

F Unit

V Unit

Rated voltage

kV

12/24

12/24

12/24

Rated frequency

Hz

50

50

50

Rated current

A

630

Depending on the current rating of the fuse.

630

Rated insulated level

  1min. power frequency withstand voltage

(To earth & between phase)

  1min. power frequency withstand voltage(Across the isolating distance)

  1min. power frequency withstand voltage(Auxiliary and control circuits)

Rated lightning impulse withstand voltage(To earth & between phases)

  Rated lightning impulse withstand voltage(Across the isolating distance)

kV

42/65

48/79

2/2

75/125

85/145

42/65

48/79

2/2

75/125

85/145

42/65

48/79

2/2

75/125

85/145

Rated Short-time withstand current(r.m.s)

kA

25/3s/20/3s

-

25/2S/20/4s

Rated peak withstand current

kA

63/50

-

63

Rated short-circuit making current(peak)

kA

63/50

Restricted by fuse

50

Rated short-circuit breaking current

kA

-

Restricted by fuse

20/20

Rated transfer current

A

-

17500/1400

-

Rated load-break current

A

630

-

-

Rated closed-loop breaking current

A

630

-

630

Mechanical operation

   Loadbreak switch/circuit breaker

   Disconnector/Earthing switch

time

5000

2000

5000

2000

10000

2000

Resistance of the main circuit

μΩ

≤120

-

≤120

Pressure of compressed gas

Rated pressure of compressed gas(absolute pressure)

Min. pressure of compressed gas(absolute pressure)

bar

1.3

1.2

1.3

1.2

1.3

1.2

Annual relative leakage rate of SF6gas

%

≤0.05

≤0.05

≤0.05