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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Drawing Central Point Linear Tap-changer

Drawing C entral P oint L inear T ap-changer If only one tap changer is required, manually operated tap points are usually made on the high voltage (primary) or lower current winding of the transformer to minimize the current handling requirements of the contacts. However, a transformer may...

Product Details

Drawing Central Point Linear Tap-changer 
If only one tap changer is required, manually operated tap points are usually made on the high voltage (primary) or lower current winding of the transformer to minimize the current handling requirements of the contacts. However, a transformer may include a tap changer on each winding if there are advantages to do so. For example, in power distribution networks, a large step-down transformer may have an off-load tap changer on the primary winding and an on load automatic tap changer on the secondary winding or windings. The high voltage tap is set to match long term system profile on the high voltage network (typically supply voltage averages) and is rarely changed. The low voltage tap may be requested to change positions multiple times each day, without interrupting the power delivery, to follow loading conditions on the low-voltage (secondary winding) network.

To minimize the number of winding taps and thus reduce the physical size of a tap changing transformer, a 'reversing' tap changer winding may be used, which is a portion of the main winding able to be connected in its opposite direction (buck) and thus oppose the voltage.

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

Samples Installation Dimension

No.

Model No.

Regulating

position

Install dimension  mm

L

L1

L2

L3

L4

L5

H

H1

1

WSTⅡ63/10-4×3

Central

376

143

122

59

99

24

100

78

2

 WSTⅡ125/10-4×3

431

163

142

59

107

29

100

78

3

 WSTⅡ250/10-4×3

431

163

142

59

112

29

100

78

4

 WSTⅡ300/10-4×3

530

203

169

69

112

34

106

78

5

WSTⅡ63/20-4×3

426

168

137

59

99

24

100

78

6

 WSTⅡ125/20-4×3

475

183

154

59

107

29

102

78

7

 WSTⅡ250/20-4×3

530

203

169

59

112

34

102

78

8

WSTⅡ63/35-4×3

526

218

157

59

103

24

120

98

9

 WSTⅡ125/35-4×3

580

228

179

59

107

34

120

98

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