ABB RELION REX640 Technical Manual page 619

Protection and control

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1MRS759142 F

Figure 352: Operation timer characteristic of IFPTOC function when Operation

principle = "Touch voltage based", Operating curve type = "Inverse time EN50522"

and UTp multiplier = 4.0. Characteristics are according to standard EN50522.

Maximum earthing Ris = 10 ohm.

• Operate time is inverse time according to standard IEEE80:

Technical Manual

Operating curve type = "Inverse time IEEE80" is selected, then

Protection functions