Resistive reach
M13142-156 v4
The resistive reach in reverse direction must be set longer than the longest reverse
zones. In blocking schemes it must be set longer than the overreaching zone at remote
end that is used in the communication scheme. In equation 245 the index ZmRv
references the specific zone to be coordinated to.
ZmRv
RFltREvPG 1.2 RFPG³ ×
EQUATION1726 V1 EN-US (Equation 245)
8.10.3.3 Phase-to-phase fault in forward direction
M13142-168 v2
Reactive reach
M13142-170 v3
The reach in reactive direction is determined by phase-to-ground reach setting X1
. No
extra setting is required.
Resistive reach
GUID-01D7AB58-12CD-44EB-89E4-4D11828141D1 v1
R1PE and R0PE must be set in a way that the loop characteristic angle can be 60 deg
(this gives a characteristic angle of 90 deg. at three-phase faults). If the 500-series
characteristic angle of 70 deg. is desired, R1PE and R0PE must be set accordingly.
Fault resistance reach
GUID-CA51D9C7-7D9A-4DE5-92F1-FA1280BB899D v1
The fault resistance reaches in forward direction RFItFwdPP, must cover RFPP
Zm
with
at least 25% margin. RFPP
Zm
is the setting of fault resistance for phase-to-phase fault
for the longest overreaching zone to be covered by FRPSPDIS (21), as shown in
figure
168. The minimum recommended reach can be calculated according to
equation 246 and 247.
Index PHS in images and equations reference settings for Phase
selection, quadrilateral characteristic with settable angle function
FRPSPDIS (21)and index Zm reference settings for Distance protection
function ZMRPDIS.
A) 60°
EQUATION1318-ANSI V1 EN-US (Equation 246)
B) 70°
1.82 1 0.32 1 0.91Zm Zm ZmRFFwdPP R PP X PP RFPP> × + × + ×
ANSIEQUATION2226 V1 EN-US (Equation 247)
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 355
Application manual
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