ABB REL650 - Page 112

K
Z Z
Z
N
set set
set
=
−
⋅
0 1
3 1
IECEQUATION15017 V1 EN-US
Z R Zx j X Zx
set
0 0 0= + ⋅
IECEQUATION15018 V1 EN-US
For Zone 1,
Z R PEZ j X PEZ
set
1 1 1 1 1= + ⋅
IECEQUATION15019 V1 EN-US
For Zone 2-5 and RV,
Z R Zx j X Zx
set
1 1 1= + ⋅
IECEQUATION15020 V1 EN-US (Equation 7)
where
Z set0
is the complex zero sequence impedance of the line in Ω/phase
Z set1 
is the complex positive sequence impedance of the line in Ω/phase
R1PEZ1 is the positive sequence resistive reach of the line in Ω/phase for
phase-to-earth fault for zone 1
X1PEZ1 is the positive sequence reactance reach of the line in Ω/phase for
phase-to-earth fault for zone 1
R0Zx is the zero sequence resistive reach of the line in Ω/phase for zone
x (x=2-5, or RV)
X0Zx is the zero sequence reactance reach of the line in Ω/phase for
zone x (x=2-5, or RV)
For an earth fault in phase L1, the angle β between the compensation voltage and
the polarizing voltage
Upol
is,
β = − + ⋅ ⋅ −arg[ ( ) ] ( )U I I K Z U
L L N set pol1 1
3 0 1 arg
IECEQUATION15021 V1 EN-US (Equation 8)
where
U
L1
is the phase voltage in faulty phase L1
IL1
is the phase current in faulty phase L1
3I
0
is the zero-sequence current in faulty phase L1
Z set1 
is the complex positive sequence impedance of the line in Ω/phase
for phase-to-earth fault in zone direction
Upol
is the polarizing voltage for phase L1
Section 6 1MRK 506 382-UEN A
Impedance protection
106 Line distance protection REL650 2.2 IEC
Technical manual