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ABB PR512 Manual page 32

Microprocessor-based self-supplied protection relays
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6
TIME-CURRENT CURVES
Time-current curves for earth fault
The time-current curves for homopolar earth fault
(Io>; Io>>) are identical to those for protection
against overload and against short-circuit (I>; I>>).
For the operating fields, please see what is
indicated on page 25 and following pages.
30

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