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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Off Load Tap-changer

Off Load Tap-changer

Off Load Tap-Changer The main characteristics of this new series of tap changers are: Speed of installation; Safe and exact switch movement; Exact contact positioning after the switching maneuver; Compact dimensions; Possibility to adapt to the thickness of the transformer tank. These units may...

Product Details

Off Load Tap-Changer 
The main characteristics of this new series of tap changers are: Speed of installation; Safe and exact switch movement; Exact contact positioning after the switching maneuver; Compact dimensions; Possibility to adapt to the thickness of the transformer tank.

These units may be used with mineral oil or silicon liquid. They are fixed below the transformer cover by a support.
They allow adjustment or combinations according to the diagrams given in the following pages. There is no need for washers during assembly because the tap changer adjusts itself according to the thickness of the transformer tank.
Oil tightness is provided by O-rings. The catalogue illustrates normally used tap changers and standard accessories. Special tap changers may be designed to meet special requirements. Tap changing procedures are very quick and simple.
They must be performed with de-energized transformer in a no-load state. To switch, just lift the knob, rotating it until the desired number or mark coincides with the colored arrow on the washer. Release then the knob and make sure that it is fasten.

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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