EMR-5000
IM02602012E
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«
www.eaton.com
553
