SF6 Gas Circuit Breaker

No.

Description

Unit

Technical Data

1

Rated voltage

kV

72.5

2

Rated frequency

Hz

50,60

3

Rated current

A

3150

4

Rated short time withstand current ( rms )

kA

31.5/40

5

Rated short circuit duration

s

4

6

Rated short circuit breaking current (rms)

Short circuit current

kA

31.5/40

Percentage of DC component

kA

45%

7

Rated short circuit making current (peak)

kA

80/100

8

Rated peak withstand current

kA

80/100

9

short-line faults breaking current

kA

Ie×90%,Ie×75%

10

Rated out-of -phase breaking current

kA

Ie×25%

11

Rated line-charging breaking current

A

31.5/50

12

Rated insulating level

1 min power frequency withstand voltage (rms)

Between breaks

kV

160

Between poles

kV

160

To earth

kV

160

Lighting impulse withstand voltage

(peak)

Between breaks

kV

350

Between poles

kV

350

To earth

kV

350

5 min withstand voltage test at zero gauge pressure( rms)

Between breaks

kV

84

To earth

kV

             84

13

First-pole-to-clear factor

—

1.5

14

Rated operating sequence

—

0-0.3s-CO-180s-CO

15

Breaking time

ms

≤60

16

Opening time

ms

≤40

17

Closing time

ms

≤120

18

Open-close time

ms

≥300

19

Close-open time

ms

≤60

20

Simultaneity during opening operation

ms

3

21

Simultaneity during closing operation

ms

5

22

Annual leakage of SF6 gas

—

≤0.5%

23

20℃Rated pressure of SF6 gas (at )

MPa

0.55

24

Terminal static tension

Horizontal longitudinal

N

1250

Horizontal transverse

N

750

Vertical

N

1000

25

Mechanical endurance

time

10000

26

Weight of SF6 gas filled for each CB

kg

8

27

Total weight of one set of CB

kg

1300

28

Resistance of main circuit for per pole

μΩ

≤60