ABB RET650 Technical Manual page 657

Relion 650 series transformer protection
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1MRK 504 135-UEN A
Technical manual
GUID-F5E0E1C2-48C8-4DC7-A84B-174544C09142 V1 EN
Figure 288:
Inverse curve B characteristic of overvoltage protection
Time inverse characteristics
Section 21
651

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