China LW36A-72.5 69kV 72.5kV High voltage three phase Outdoor AC SF6 Circuit Breaker

Product Description

72.5kV SF6 circuit breaker adopts three phase porcelain knob construction, outdoor design.

Three phase serve for one spring operation mechanism, locates in the middle, three phase ganged. It adopts SF6 gas as insulation and arcing medium, the SF6 gas should be connective in three poles at working, it adopts

pointer density relay to monitor pressure and density. Improve mechanical efficiency and Reduce operate power by the greatest extent, because of adopting auto-accumulation energy principle and making use of optimal

design.

No.

Item

Unit

Parameter

1

Rated voltage

kV

72.5

2

Rated power frequency withstand voltage(1min)

to ground

160

between gap

176

3

Rated lightning impulse withstand voltage

to ground

350

Between

gap

385

4

The power frequency withstand voltage when gas SF6 is zero pressure(5min)

55

5

Rated frequency

Hz

50/60

6

Rated current

A

3150

7

First pole factor

1.5

8

Rated short circuit breaking current

kA

40/31.5

9

Rated short circuit making current

100/80

10

Rated short time withstand current

40/31.5

11

Rated peak withstand current

100/80

12

Rated short circuit continuous time

s

4

13

Rated out of synchronism breaking current

kA

10

14

Short line fault breaking current

36,30

15

Rated line charge breaking current

A

31.5

16

Rated operating sequence

O-0.3s-CO-180s-CO

17

Switch off time

ms

30±3

18

Switch on time

75±8