Eaton EDR-5000 - Page 448

EDR-5000 IM02602007E
Criterion - Measuring Mode
For all protection elements it can be determined, whether the measurement is done on basis of the » Fundamental« or if
» TrueRMS« measurement is used.
Voltage restraint overcurrent protection 51V
When the Parameter » VRestraint« is set to active the overcurrent protection element works voltage restraint. That
means, the overcurrent pickup threshold will be lowered during voltage drops. This results in a more sensitive
overcurrent protection. For the voltage threshold » VRestraint max« additionally the » Measuring Channel« can be
determined.
All 51P overcurrent protective elements can be planned as non-directional or optionally as directional elements. This
means, all 6 elements can be planned user defined in forward/reverse or non directional.
For each element the following characteristics are available:
NINV (IEC/AMZ)
VINV (IEC/AMZ)
LINV (IEC/AMZ)
EINV (IEC/AMZ)
MINV (ANSI/AMZ)
VINV (ANSI/AMZ)
EINV (ANSI/AMZ)
Thermal Flat
IT
I2T
I4T
For tripping curves please refer to the “Appendix/Time Current Curves (PHASE)” section.
By using the projecting parameters each of the overcurrent protective elements can be defined as »forward« ,
»reverse« or »non-directional« . The forward or reverse direction is based on the characteristic angle for the phase
direction specified by the field parameter »I MTA« . No directional information will be taken into account if the current
protective element is planned as »non-directional«
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