Directional Impedance Element For Quadrilateral Characteristics - ABB RELION 670 Series Technical Manual

1MRK 502 066-UUS B
The calculated
The adaptive tripping counter counts the number of permissive tripping results. This effectively
removes any influence of errors introduced by the capacitive voltage transformers or by other
factors.
The directional evaluations are performed simultaneously in both forward and reverse directions,
and in all six fault loops. Positive sequence voltage and a phase locked positive sequence memory
voltage are used as a reference. This ensures unlimited directional sensitivity for faults close to
the IED point.
7.1.7.5

Directional impedance element for quadrilateral characteristics

The evaluation of the directionality takes place in Directional impedance quadrilateral function
ZDRDIR (21D). Equation
direction for phase-to-ground fault and phase-to-phase fault.
-
ArgDir
EQUATION1552 V2 EN-US
For the AB element, the equation in forward direction is according to.
-
ArgDir
EQUATION1553 V2 EN-US
where:
AngDir
AngNegRes is the setting for the upper boundary of the forward directional characteristic, by default set to 115
V1
A
V1
AM
I
A
V1
AB
V1
ABM
I
AB
The setting of
(as shown in figure 76). It should not be changed unless system studies have shown the necessity.
ZDRDIR gives binary coded directional information per measuring loop on the output STDIRCND.
STDIR=
Technical manual
R X
and values are updated each sample and compared with the set zone reach.
m m
43 and equation
× + ×
0.8 V 1 0.2 V 1
<
arg L 1 L M
I
L 1
× + ×
0.8 V 1 0.2 V 1
<
arg L L 1 2
I
L L 1 2
is the setting for the lower boundary of the forward directional characteristic, by default set to 15 (=
-15 degrees) and
degrees, see figure 76.
is positive sequence phase voltage in phase A
is positive sequence memorized phase voltage in phase A
is phase current in phase A
is voltage difference between phase A and B (B lagging A)
is memorized voltage difference between phase A and B (B lagging A)
is current difference between phase A and B (B lagging A)
AngDir and AngNegRes is by default set to 15 (= -15) and 115 degrees respectively
FWD_A*1+FWD_B*2+FWD_C*4+FWD_AB*8+
+FWD_BC*16+FWD_CA*32+REV_A*64+REV_B*128+REV_C*256+
+REV_AB*512+REV_BC*1024+REV_CA*2048
44 are used to classify that the fault is in forward
<
1 ArgNeg Re s
<
L L M 1 2 ArgNeg Re s
Section 7
Impedance protection
M16923-139 v6
(Equation 43)
(Equation 44)
191