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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Series-parallel Combined Linear Tap-changer

Series-parallel combined linear tap-changer In this method of tap changing, the tapping heads are changed when the transformer is disconnected from the supply. As per the requirement the tappings are taken out on the respective winding and the connections are brought out near the top of...

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Product Details

Series-parallel combined linear tap-changer 
In this method of tap changing, the tapping heads are changed when the transformer is disconnected from the supply. As per the requirement the tappings are taken out on the respective winding and the connections are brought out near the top of transformer. Manually operated selector switches are provided for change in tappings. The commonly used switches are vertical tappings switches and faceplate switches.

The above arrangement is normally used to get ±5 % change in the steps of ±2.5 %. It consists of an insulating base on which six brass or copper terminals are mounted. The contactor is mounted on an arm of the shaft. The central or middle part of the winding contains the taps and the taps are connected to terminals of tap changer. The shaft can be rotated from one position to another so that the selector switch is connected to adjacent pairs of stationary terminals.

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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