ABB REG670 Technical Manual page 1287

Relion 670 series 2.0 iec generator protection
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1MRK502052-UEN B
Technical manual
GUID-35F40C3B-B483-40E6-9767-69C1536E3CBC V1 EN
Figure 597:
Inverse curve A characteristic of undervoltage protection
Inverse time characteristics
Section 25
1281

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