ABB RELION REX640 Technical Manual page 1032

Protection and control

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Protection functions

Figure 573: Short circuit current waveform, fault occurs at time 0 seconds (Current

setting limit is multiplied by the square root of 2)

The phase voltage in a three-phase short circuit when a fault occurs at time = 0 s is

time for determining the fault by means of an underimpedance protection.

. The voltage drop caused by a three-phase fault provides more

1MRS759142 F

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