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 100 the index ZmRv references the
specific zone to be coordinated to.
ZmRv
RFltREvPG 1.2 RFPG³ ×
EQUATION1726 V1 EN (Equation 276)
8.10.3.3 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
107. The
minimum recommended reach can be calculated according to equation
277 and 278.
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 277)
B) 70°
1.82 1
0.32 1 0.91Zm Zm ZmRFFwdPP R PP X PP RFPP> × + × + ×
ANSIEQUATION2226 V1 EN
(Equation 278)
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 343
Application manual
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