Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Additional distance protection
directional function for earth faults
ZDARDIR
S00346 V1 EN
-
6.6.1
Introduction
The phase-to-ground impedance elements can be optionally supervised by a phase
unselective directional function based on symmetrical components.
6.6.2
Principle of operation
6.6.2.1
Directional impedance element for mho characteristic ZDMRDIR (21D)
The evaluation of the directionality takes place in Directional impedance element for
mho characteristic (ZDMRDIR ,21D). Equation
that the fault is in the forward direction for phase-to-ground fault and phase-to-phase
fault respectively.
0.85
1
0.15 1
Re
V A
V AM
AngDir
Ang
AngNeg
s
IA
×
+
×
-
<
<
EQUATION1618 V1 EN
(Equation 50)
0.85
1
0.15
1
Re
V AB
V ABM
AngDir
Ang
AngNeg
s
IAB
×
+
×
-
<
<
EQUATION1620 V1 EN
(Equation 51)
Where:
AngDir
Setting for the lower boundary of the forward directional characteristic, by default set to
15 (= -15 degrees)
AngNegRes
Setting for the upper boundary of the forward directional characteristic, by default set to
for mho characteristics.
V1A
Positive sequence phase voltage in phase A
V1AM
Positive sequence memorized phase voltage in phase A
IA
Phase current in phase A
V1AB
Voltage difference between phase A and B (B lagging A)
V1ABM
Memorized voltage difference between phase A and B (B lagging A)
IAB
Current difference between phase A and B (B lagging A)
1MRK505222-UUS C
Section 6
Impedance protection
277
Technical reference manual
Summary of Contents for Relion 670 series
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