ABB RELION 670 Series Applications Manual page 223

1MRK 504 152-UEN B
-
ArgDir
EQUATION726 V2 EN-US
where:
ArgDir
ArgNegRes
U 1
L 1
U 1
L M 1
I
1 L
U 1
L L 1 2
U 1
L L M 1 2
I
L L 1 2
The setting of
(as shown in figure 120). 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=
Application manual
× + ×
0.8 U 1 0.2 U 1
<
arg L L 1 2 L L M 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
is the setting for the upper boundary of the forward directional characteristic, by default set to
115 degrees, see figure 120.
is positive sequence phase voltage in phase L1
is positive sequence memorized phase voltage in phase L1
is phase current in phase L1
is voltage difference between phase L1 and L2 (L2 lagging L1)
is memorized voltage difference between phase L1 and L2 (L2 lagging L1)
is current difference between phase L1 and L2 (L2 lagging L1)
ArgDir and ArgNegRes is by default set to 15 (= -15) and 115 degrees respectively
STFWL1*1+STFWL2*2+STFWL3*4+STFWL1L2*8+
+STFWL2L3*16+STFWL3L1*32+STRVL1*64+STRVL2*128+
+STRVL3*256+STRVL1L2*512+STRVL2L3*1024+STRVL3L1*2048
<
ArgNeg Re s
Section 7
Impedance protection
(Equation 162)
217