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Off load tap changer
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Phase |
Three phases\single phase |
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Connect type |
Change voltage at middle （Ⅱ）, at neutral point（Ⅲ）, at terminal（Ⅰ）, Y-△, series or parallel connected |
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Max. rated current（A） |
30 |
63 |
125 |
250 |
400 |
500 |
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Short-circuit test current（KA） |
Thermal stability（3S） |
0.7 |
1.6 |
2.5 |
5 |
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Dynamic stability (peak) |
1.8 |
4 |
6.25 |
12.5 |
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Rated frequency（Hz） |
50～60 |
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Max. working position number |
7 |
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Rated insulation（KV） |
Max. voltage Um |
12KV |
23KV |
40.5KV |
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Rated power frequency withstand voltage |
42KV |
55KV |
95KV |
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Rated impulse withstand voltage |
75KV |
125KV |
200KV |
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Working pressure（Mpa） |
0.25 |
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Mechanical service life（thousand times） |
2 |
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Scope |
Oil-immersed transformers |
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