ABB RELION 670 Series Technical Manual page 1421

Generator protection
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1MRK 502 066-UUS B
GUID-B55D0F5F-9265-4D9A-A7C0-E274AA3A6BB1 V1 EN-US
Figure 724: Inverse curve B characteristic of undervoltage protection
Technical manual
Section 26
Inverse time characteristics
1415

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