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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Neutral Point Linear Tap Selector

N eutral P oint L inear T ap Selector Voltage fluctuations on transmission grids often require transformers to have either short term or long term regulation capability. The easiest way to do this is to add or subtract turns to the transformer windings. Tap changer switches provide an external...

Product Details

Neutral Point Linear Tap Selector

Voltage fluctuations on transmission grids often require transformers to have either short term or long term regulation capability. The easiest way to do this is to add or subtract turns to the transformer windings. Tap changer switches provide an external means to accomplish this voltage adjustment.

Most transformers include a manually operated tap changer switch on the high voltage winding. Manual tap changer adjustments can only be made however, while the transformer is de-energized. On power distribution networks, a large step-down transformer may include an off-load tap changer and an on-load automatic tap changer (LTC). The off load tap changer is set to match the long term system profile on the high voltage network and is rarely changed. The LTC tap changer however, may change positions several times a day, to accommodate varying load conditions, without interrupting the power supply.

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

ΦD1

1

WSTⅢ63/10-3×3

Neutral point

362

139

122

59

99

24

100

78

90

2

WSTⅢ125/10-3×3

394

149

133

59

107

29

100

78

3

WSTⅢ250/10-3×3

394

149

133

59

112

29

100

78

4

WSTⅢ63/20-3×3

362

139

122

59

99

24

120

98

5

WSTⅢ125/20-3×3

394

149

133

59

107

29

120

98

6

WSTⅢ250/20-3×3

446

169

144

59

112

34

120

98

7

WSTⅢ63/35-3×3

362

139

122

59

103

24

140

118

8

WSTⅢ125/35-3×3

424

159

143

59

107

34

140

118

9

WSTⅢ250/35-3×3

424

159

143

59

112

34

140

118

10

WSTⅢ63/10-5×5

506

187

170

59

99

24

100

78

11

WSTⅢ125/10-5×5

568

207

191

59

107

29

100

78

12

WSTⅢ250/10-5×5

568

207

191

59

112

29

100

78

13

WSTⅢ300/10-5×5

628

227

211

69

112

34

106

78

105

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