R
0E
R
0
1
X
m0
2
R
0
2
X
0
2
+
--------------------------
+
è
ø
ç
÷
æ
ö
×
=
EQUATION561 V1 EN-US
(Equation 155)
X
0E
X
0
1
X
m0
2
R
0
2
X
0
2
+
--------------------------
–
è
ø
ç
÷
æ
ö
×
=
EQUATION562 V1 EN-US
(Equation 156)
7.3.3.6
Setting of reach in resistive direction
SEMOD55087-84 v7
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 157)
2 X1 X0
arctan
2 R1 R0
loop
j
×
+
=
×
+
é
ù
ê
ú
ë
û
EQUATION2304 V1 EN-US
(Equation 158)
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 159)
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 in the phase
domain to:
RFPP
X
≤ ⋅
6
1
IECEQUATION2306 V2 EN-US
(Equation 160)
7.3.3.7
Load impedance limitation, without load encroachment function
SEMOD55087-97 v9
The following instructions are valid when Phase selection with load encroachment,
quadrilateral characteristic function FDPSPDIS is not used. The setting of the load resistance
RLdFw and RLdRv in FDPSPDIS must in this case be set to max value (3000). If FDPSPDISis to
be used for all or some of the measuring zones, the load limitation for those zones according
to this chapter can be omitted. Check the maximum permissible resistive reach for any zone to
Section 7
1MRK 505 343-UEN B
Impedance protection
214
Application manual
Содержание Relion 670 series
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