EMR-4000 IM02602009E
51P - Overcurrent Protection [51, 51C, 51V]
Available stages:
51P[1] ,51P[2] ,51P[3]
If you are using inrush blockings the tripping delay of the current protection functions must
be at least 30ms or more in order to prevent faulty trippings.
In order to ensure correct functioning of the directional detection after single-phase short-
circuits, the following reference voltage is used: For phase current
IA
it is the line-to-line
voltage
VBC
, for phase current
IB
the line-to-line voltage
VCA
and for phase current
IC
the
line-to-line voltage
VAB
.
In case the fault happens to be near the measuring location and there is no reference
voltage for directional recognition available any more (neither measured or from history
(voltage memory)), then the module will - depending on the parameter setting - either trip
non-directional or it will be blocked.
All overcurrent protective elements are identically structured.
This module offers Adaptive Parameter Sets.
Parameters can be modified within parameter sets dynamically by means of
Adaptive Parameter Sets.
Please refer to chapter Parameter / Adaptive Parameter Sets.
The following table shows the application options of the Overcurrent Protection element
Applications of the 51P-Protection Module Setting in Option
ANSI 51 – Short circuit protection, non-
directional
Device Planning menu Criterion: Fundamental/TrueRMS
ANSI 51V – Voltage restraint overcurrent
protection
Parameter Set:
VRestraint = active
Criterion: Fundamental/TrueRMS
51C Voltage controlled overcurrent protection
(Please refer to the chapter
Parameter/Adaptive Parameter)
Adaptive Parameters Criterion: Fundamental/TrueRMS
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