ABB RET650 Technical Manual page 660

Relion 650 series transformer protection
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Section 21
Time inverse characteristics
654
GUID-B55D0F5F-9265-4D9A-A7C0-E274AA3A6BB1 V1 EN
Figure 291:
Inverse curve B characteristic of undervoltage protection
1MRK 504 135-UEN A
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