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Aluminum Hand-wheel Linear Tap-changer

Aluminum H and - wheel L inear T ap-changer The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an...

Product Details

Aluminum Hand-wheel Linear Tap-changer 
The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an on-load tap changer (OLTC) and a de-energized tap changer (DETC). Note that not all transformers have tap changers. 

An OLTC varies the transformer ratio while the transformer is energized and carrying load. The switching principle uses the “make before break” contact concept. An adjacent tap is bridged before breaking contact with the load carrying tap for the purpose of transferring load from one tap to the other without interrupting or appreciably changing the load current.

This kind of drawing hand wheel terminal point linear tap-changer applies to the single-phase, three phase and combination oil-immersed transformer electrical power with frequency of 50HZ,60HZ,rated voltage of 10KV,35KV,rated current of 30A~500A. The voltage-regulating modes are: central part, terminal point neutral point etc. which can be directly fixed on the tank cover of the transformer, exchange under the off-circuit condition.

Model Explanation
 WST □ - □/□-□╳□
    W:  off-circuit
    S :  three-phase or D for single phase
    T :  linear type tap chager
    □:  voltage regulation model
    □:  rated current
    □:  rated voltage
    □:  number of tapping heads
    □:  number of tapping position

Voltage Regulation Model
    I  :  terminal point
    II :   central point
    III :  neutral point
   IV :  Y-△ conversion
   V :  series-parallel connection

Samples Technical Data

Specifications

WST 30

WST 63

WST 125

WST 250

WST 400

WST 500

Phase number

three-phases

Connection mode

Central point(Ⅱ) Neutral Point(Ⅲ) Terminal Point(Ⅰ)

Rated through current(A)

30

63

125

250

400

500

Short-circuit capacity

Heat stableness current(KA/2s)

0.7

1.6

2.5

3.75

4

5

Dynamic stableness current(KA)

1.8

4

6.25

9.375

10

12.5

           Rated frequency

50~60

Insulation level(KV)

Rated Voltage

10KV

20KV

35KV

Power-frequency withstand Voltage(50Hz/1min)

42KV

55KV

95KV

Impulse(1.2/50μs)

75KV

125KV

250KV

Sealing Performance(KPa/24h)

60

Machine life(Thousands of times)

2

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