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Off load tap changer

basic information
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Product Description
　　This series is used in 50Hz or 60Hz oil immersed transformers with rated voltage 10kV-30kV.When voltage is to change,transformer must be cut off from the grid.At no excitation state,transformer primary winding number is changed through tap changer;therefore,secondary voltage is changed accordingly.
 
 

Phase

Three phases\single phase

Connect type

Change voltage at middle （Ⅱ）, at neutral point（Ⅲ）, at terminal（Ⅰ）, Y-△, series or parallel connected

Max. rated current（A）

30

63

125

250

400

500

Short-circuit test current（KA）

Thermal stability（3S）

0.7

1.6

2.5

5

 

 

Dynamic stability (peak)

1.8

4

6.25

12.5

 

 

Rated frequency（Hz）

50～60

Max. working position number

7

Rated insulation（KV）

Max. voltage Um

12KV

23KV

40.5KV

Rated power frequency withstand voltage
（50Hz／1min)

42KV

55KV

95KV

Rated impulse withstand voltage
（1.2／50μs)

75KV

125KV

200KV

Working pressure（Mpa）

0.25

Mechanical service life（thousand times）

2

Scope

Oil-immersed transformers
On a
Transformer radiator
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