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.
When
Operating curve type
= “Inverse time IEEE80” is selected, then
• Operate time is inverse time according to standard IEEE80:
1MRS759142 F
Protection functions
REX640
Technical Manual
619
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