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 Introduction
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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