Seg WIC1 - Appendix - Time Overcurrent Characteristics; Characteristics (I>, I>>, I>>>)

11.2 Appendix – Time Overcurrent Characteristics
11.2.1
Characteristics (I>, I>>, I>>>)
For each phase overcurrent stage, the following characteristics are available:
• DEFT – De󰅰nite Time-Overcurrent•
•
Inverse-Time Overcurrent Curves according to IEC 60255‑151:
•
◦ NINV – IEC Normal Inverse (IEC 60255‑151)◦
◦ VINV – IEC Very Inverse (IEC 60255‑151)◦
◦
LINV – IEC Long Time Inverse (IEC 60255‑151)
◦
◦ EINV – IEC Extremely Inverse (IEC 60255‑151)◦
• RINV – R Inverse•
• HV Fuse Fuse Characteristic of an HV Fuse•
• FR Fuse Fuse Characteristic of a Full Range Fuse•
• Curves De󰊟ned in IEEE C37.112:•
◦ MINV – IEEE Moderately Inverse (IEEE C37.112)◦
◦ VINV – IEEE Very Inverse (IEEE C37.112)◦
◦ EINV – IEEE Extremely Inverse (IEEE C37.112)◦
•
EF Curve “EF” Curve
•
Explanation for All Characteristics (I>, I>>, I>>>)
(Remark: All settings are given for protection stage »I>«. »I>>« and »I>>>« have the
same settings with corresponding menu branches.)
• I: Fault current•
• I> = I
>
: Pickup value for the Phase Overcurrent stage. If the pickup value is•
exceeded, the stage starts to time out to trip.
Setting: [Protection Para / I>] »I«
• Trip delay t for I > I
>
:•
◦ for »Char« = “DEFT”: settable via [Protection Para / I>] »t«.◦
◦ for all other characteristics: calculated based on the selected curve.◦
•
Reset mode for I < I
>
, settable via »Reset Mode«, available options:
•
◦ With option »Reset Mode« = “instantaneous”: Instantaneous reset: when the◦
current drops below the pickup setting, the TOC time resets to zero within 2
cycles.
◦ With option »Reset Mode« = “de󰊟nite time”: The reset delay is settable◦
at »tReset«.
271WIC1WIC1-1.0-EN-MAN
11 Appendix
11.2 Appendix – Time Overcurrent Characteristics