4ECHNICAL DATA
3*
6
# ' #
$IRECTION DETERMINATION FOR PHASE FAULTS
-EASUREMENT METHOD
PHASE CURRENT POLARIZED WITH QUADRATURE VOLTAGES
WITH MEMORIZED VOLTAGE MEMORY DEPTH AC
PERIODS IF POLARIZING VOLTAGES TOO SMALL
&ORWARDS AREA
TO
IF QUADRATURE VOLTAGE IS RECTANGULAR WITH RESPECT
TO THE FAULT VOLTAGE
$IRECTIONAL SENSITIVITY
UNLIMITED FOR SINGLE PHASE AND TWO PHASE FAULTS
FOR THREE PHASE FAULTS DYNAMICALLY UNLIMITED
STEADY STATE APPROX 6 PHASE TO PHASE
$IRECTION DETERMINATION FOR EARTH FAULTS
-EASUREMENT METHOD
EARTH CURRENT POLARIZED WITH DISPLACEMENT VOLTAGE
&ORWARDS AREA
TO
$IRECTIONAL SENSITIVITY
APPROX 6 DISPLACEMENT VOLTAGE
4OLERANCES AND INFLUENCING VARIABLES
!NGLE ERROR UNDER REFERENCE CONDITIONS
FOR PHASE FAULTS
q ELECTRICAL
FOR EARTH FAULTS
q ELECTRICAL IF 5
EN
VOLTAGE CONNECTED
q ELECTRICAL IF 5
EN
VOLTAGE IS CALCULATED
&REQUENCY DEPENDENT INFLUENCE
WITH NON MEMORIZED VOLTAGE
APPROX IN THE RANGE FF
.
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