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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 410)
X
0E
X
0
1
X
m0
2
R
0
2
X
0
2
+
--------------------------
–
è
ø
ç
÷
æ
ö
×
=
EQUATION562 V1 EN-US
(Equation 411)
7.13.4.7
Setting of reach in resistive direction
GUID-43EE13AF-BEBC-4A13-95B3-53C28B9164CB v3
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
(
)
1
R
2 R1 R0
RFPE
3
=
×
+
+
IECEQUATION2303 V1 EN-US
(Equation 412)
2 X1 X0
arctan
2 R1 R0
loop
j
×
+
=
×
+
é
ù
ê
ú
ë
û
EQUATION2304 V1 EN-US
(Equation 413)
Setting of the resistive reach for the underreaching zone 1 should follow the condition to
minimize the risk for overreaching:
RFPE
4.5 X1
£
×
IECEQUATION2305 V1 EN-US
(Equation 414)
The fault resistance for phase-to-phase faults is normally quite low, compared to the fault
resistance for phase-to-earth faults. To minimize the risk for overreaching, limit the setting of
the zone 1 reach in resistive direction for phase-to-phase loop measurement to:
RFPP
X
≤ ⋅
6
1
IECEQUATION2306 V2 EN-US
(Equation 415)
Note that
RLdFw and RLdRv
[7]
are not only defining the load encroachment boundary. They are
used internally as reference points to improve the performance of the phase selection. In
addition, they define the impedance area where the phase selection element gives indications,
so do not set RLdFw and RLDRVFactor to excessive values even if the load encroachment
[7] RLdRv=RLdRvFactor*RLdFw.
1MRK 505 343-UEN B
Section 7
Impedance protection
359
Application manual
Содержание Relion 670 series
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