ABB REL670 2.2 IEC - Setting of Reach in Resistive Direction

If the denominator in equation 78 is called B and Z0m is simplified to X0m, then
the real and imaginary part of the reach reduction factor for the overreaching zones
can be written as:
( )
( )
( ) ( )
2 2
0 Re
Re 0 1
Re Im
X m B
K
B B
×
= -
+
EQUATION1427 V2 EN-US (Equation 79)
( )
( )
( ) ( )
2 2
0 Im
Im 0
Re Im
X m B
K
B B
×
=
+
EQUATION1428 V2 EN-US (Equation 80)
Parallel line is out of service and earthed in both ends
SEMOD168247-69 v2
Apply the same measures as in the case with a single set of setting parameters. This
means that an underreaching zone must not overreach the end of a protected circuit
for the single phase-to-earth-faults. Set the values of the corresponding zone (zero-
sequence resistance and reactance) equal to:
R
0E
R
0
1
X
m0
2
R
0
2
X
0
2
+
--------------------------
+
è ø
ç ÷
æ ö
×=
EQUATION561 V1 EN-US (Equation 81)
X
0E
X
0
1
X
m0
2
R
0
2
X
0
2
+
--------------------------
–
è ø
ç ÷
æ ö
×=
EQUATION562 V1 EN-US (Equation 82)
8.1.3.7 Setting of reach in resistive direction
SEMOD168247-76 v2
Set the resistive reach independently for each zone, and separately for phase-to-
phase (R1PP), and phase-to-earth loop (R1PE) measurement.
Set separately the expected fault resistance for phase-to-phase faults (R1PP) and
for the phase-to-earth faults (RFPE) for each zone. Set all remaining reach setting
parameters independently of each other for each distance zone.
The final reach in resistive direction for phase-to-earth fault loop measurement
automatically follows the values of the line-positive and zero-sequence resistance,
and at the end of the protected zone is equal to equation 83.
R
1
3
---
2 R1PE× R0PE+
( )
RFPE+=
EQUATION567 V1 EN-US
(Equation 83)
Section 8 1MRK 506 369-UEN B
Impedance protection
198 Line distance protection REL670 2.2 IEC
Application manual