ABB RELION 670 Series Technical Manual page 1418

Generator protection
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Section 26
Inverse time characteristics
GUID-F5E0E1C2-48C8-4DC7-A84B-174544C09142 V1 EN-US
Figure 721: Inverse curve B characteristic of overvoltage protection
1412
1MRK 502 066-UUS B
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