Eaton EDR-5000 Nstallation, Operation And Maintenance Manual page 472

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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

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

For tripping curves please refer to "Time Current Curves (PHASE)" located in the Appendix.

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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