ABB REL670 2.2 IEC - Page 239

1 1
1
0.8 1 0.2 1
arg Re
L L M
L
U U
ArgDir ArgNeg s
I
× + ×
- < <
EQUATION725 V2 EN-US (Equation 146)
For the L1-L2 element, the equation in forward direction is according to.
1 2 1 2
1 2
0.8 1 0.2 1
arg Re
L L L L M
L L
U U
ArgDir ArgNeg s
I
× + ×
- < <
EQUATION726 V2 EN-US (Equation 147)
where:
ArgDir is the setting for the lower boundary of the forward directional characteristic, by default
set to 15 (= -15 degrees) and
ArgNegRes is the setting for the upper boundary of the forward directional characteristic, by default
set to 115 degrees, see figure 120.
1
1
L
U
is positive sequence phase voltage in phase L1
1
1
L M
U
is positive sequence memorized phase voltage in phase L1
1L
I
is phase current in phase L1
1 2
1
L L
U
is voltage difference between phase L1 and L2 (L2 lagging L1)
1 2
1
L L M
U
is memorized voltage difference between phase L1 and L2 (L2 lagging L1)
1 2L L
I
is current difference between phase L1 and L2 (L2 lagging L1)
The setting of ArgDir and ArgNegRes is by default set to 15 (= -15) and 115
degrees respectively (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=
STFWL1*1+STFWL2*2+STFWL3*4+STFWL1L2*8+
+STFWL2L3*16+STFWL3L1*32+STRVL1*64+STRVL2*128+
+STRVL3*256+STRVL1L2*512+STRVL2L3*1024+STRVL3L1*2048
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 233
Application manual