Setting Of Reach In Resistive Direction - ABB REL670 2.2 IEC Applications Manual

Section 8
Impedance protection
8.13.4.7
400
Z 0
m
= -
K 0 1
× + +
2 Z 1 Z 0 R
f
EQUATION1426 V1 EN-US
If the denominator in equation
the real and imaginary part of the reach reduction factor for the overreaching zones
can be written as:
×
X m 0 Re
( )
= -
Re K 0 1
( )
2
+
Re B Im
EQUATION1427 V2 EN-US
( )
×
( ) X m 0 Im
=
Im K 0
( )
2
+
Re B Im
EQUATION1428 V2 EN-US
Parallel line is out of service and earthed in both ends
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:
2
æ
X
m0
×
ç ------------------------- -
R = R 1 +
0E 0
2
è
R + X
0 0
EQUATION561 V1 EN-US
2
æ
X
m0
×
X = X ç 1 – ------------------------- -
0E 0
2
è
R + X
0 0
EQUATION562 V1 EN-US

Setting of reach in resistive direction

Set the resistive reach R1 independently for each zone.
Set separately the expected fault resistance for phase-to-phase faults RFPP and for
the phase-to-earth faults RFPE for each zone. For each distance zone, set all
remaining reach setting parameters independently of each other.
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 389.
384 is called B and Z0m is simplified to X0m, then
( )
B
( )
2
B
B
( )
2
B
ö
÷
2
ø
ö
÷
2
ø
1MRK 506 369-UEN B
(Equation 384)
(Equation 385)
(Equation 386)
GUID-EC052207-C9AF-47EC-999A-BD485378FD9E v1
(Equation 387)
(Equation 388)
GUID-43EE13AF-BEBC-4A13-95B3-53C28B9164CB v3
Line distance protection REL670 2.2 IEC
Application manual