Air Insulated 24kv Load Break Switch

- May 04, 2017-

Load switch.jpg

I Main technical specification

Table 1 Main technical specification of load switch and earthing switch

S.N.

Name

Unit

Data

1

Rated voltage

kV

24

2

Rated frequency

Hz

50

3

Rated current

A

630

4

Max. rated current of fuse  

A

80

5

Rated active load breaking current, rated closed loop breaking current

A

630

6

Rated short time withstand current (2S)

kA

20

7

Rated short circuit making current, rated peak withstand current

kA

50

8

1min power frequency withstand voltage, between phases and to ground/gap

kV

65/79

9

Lightning impulse withstand voltage (peak) between phases and to ground/gap

kV

125/145

10

rated cable-charging breaking current

A

16

11

Mechanical life

times

2000

12

Rated breaking transfer current

A

1050

13

Rated short circuit breaking current of fuse

kA

31.5

Table 2  Main mechanical characteristics of load switch

S.N.

Name

Unit

Data

Remark

1

Phase distance

mm

300±3


2

Total stroke of conducting rod

mm

290±5


3

Contact clearance of fixed and moved contact at opening position

mm

215


4

Electrical contact overstroke of moved contact rod

mm

42±3


5

Closing speed when first touch

m/s

2.8

+0.7


-0.2

6

Opening speed when first touch

m/s

1.7


7

Non-synchronism of three-phase closing

ms

10


8

Non-synchronism of three-phase opening

ms

5


Table 3  Main mechanical characteristics of earthing switch

S.N.

Name

Unit

Data

Remark

1

Contact clearance of fixed and moved contact at opening position

mm

215


2

Non-synchronism of three-phase closing

ms

10


 

II Structure

Drawing 1  Overall and installation dimension of pneumatic load break

 Overall drawing of 24kV load switch.jpg

Right operation