24kV Pneumatic Type Load Break Switch

24kV Pneumatic Type Load Break Switch

FN12-24DType Indoor AC High-voltage Pneumatic Type Load Break Switch FN12-24RD Type Indoor AC High-voltage Pneumatic Type Load Break Switch-Fuse Composite Apparatus 1 General description 1.1 FN12-24RD series HV puffer-type load switch and its composite apparatus is AC 24kV, 50Hz indoor...

Product Details

 FN12-24DType Indoor AC High-voltage Pneumatic Type Load Break Switch

1 General description

1.1 FN12-24RD series HV puffer-type load switch and its composite apparatus is AC 24kV, 50Hz indoor high-voltage switch. The load switch with high technical parameters and reliable movement, its basic operating type is by manual, but also can be equipped with electromagnet spring operating mechanism. Based on puffer arc-extinguishing principle, it can break repeatedly, no need to change vacuum interrupter. Under normal circuit condition, high-voltage load switch can make, bear and break load current, and has the ability to make short-circuit current, and bear short-circuit current in certain times.

FN12-24RD series load switch can be installed with earthing switch. The earthing switch has the same capability of short-circuit making and dynamic stability with load switch, and has strict mechanical interlock with load switch, which structure ensure no misopertion.

1.2  When FN12-24RD series load switch installed with high-voltage current-limiting fuse (with striker), make a load switch-fuse composite apparatus, as overload and short-circuit protection of load (such as power transformer). When one or more phases of fuse melted down, three phases of load switch open automatically. High-voltage load switch is suitable to install in ring main unit and other switchgear types, used as accepting and distributing power.

1.3 Applying ambient conditions:

a. Ambient temperature: -10℃~+40℃.

b.The height above sea level: no more than 1000m.

c.Relative humidity: the average humidity of a day should be no more than 95%; the average humidity of a month should be no more than 90%.

d. Seismic intensity: below 8 degrees.

1.4 Standard

GB3804-2004 3~63kV AC HV Load Switch

GB16926-2009 HV AC Load Switch-Fuse Composite Apparatus

2 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

100

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

Rated breaking no-load transformer

kVA

1250

12

Mechanical life

times

2000

13

Rated breaking transfer current

A

1050


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

Contact of moving contact rod and contact finger

8

Non-synchronism of three-phase opening

ms

≯5

Separation of moving contact rod and contact finger

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

230


2

Non-synchronism of three-phase closing

ms

≯10





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