Resistive reach
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 174 the index ZmRv
references the specific zone to be coordinated to.
ZmRv
RFltREvPG 1.2 RFPG³ ×
EQUATION1726 V1 EN (Equation 287)
Phase-to-phase fault in forward direction
Reactive reach
The reach in reactive direction is determined by phase-to-ground reach setting X1. No
extra setting is required.
Resistive reach
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
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
110. The minimum recommended reach can be calculated according to
equation 288 and 289.
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
(Equation 288)
B) 70°
1.82 1
0.32 1 0.91Zm Zm ZmRFFwdPP R PP X PP RFPP> × + × + ×
ANSIEQUATION2226 V1 EN
(Equation 289)
1MRK504116-UUS C Section 3
IED application
351
Application manual
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