ABB RELION 670 Series Applications Manual page 285

1MRK 504 152-UEN B
X0
PHS
EQUATION1310 V1 EN-US
where:
X1
Zm
1.44
X0
Zm
The reactive reach in reverse direction is automatically set to the same reach as for forward
direction. No additional setting is required.
Fault resistance reach
The resistive reach must cover
Consider the longest overreaching zone if correct fault selection is important in the
application. Equation
RFFwPE
EQUATION1312 V2 EN-US
where:
RFPE
Zm
The security margin has to be increased to at least 1.2 in the case where φloop<60° to avoid
that FDPSPDIS characteristic shall cut off some part of the zone measurement characteristic.
Phase-to-earth fault in reverse direction
Reactive reach
The reactive reach in reverse direction is the same as for forward so no additional setting is
required.
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
be coordinated to.
RFRvPE
EQUATION1316 V1 EN-US
Phase-to-phase fault in forward direction
Reactive reach
The reach in reactive direction is determined by phase-to-earth reach setting
setting is required.
Resistive reach
In the same way as for phase-to-earth fault, the reach is automatically calculated based on
setting
Application manual
³ ×
1.44 X0
Zm
is the reactive reach for the zone to be covered by FDPSPDIS, and the constant
is a safety margin
is the zero-sequence reactive reach for the zone to be covered by FDPSPDIS
260 gives the minimum recommended resistive reach.
³ ×
1.1 RFPE
min zm
RFPE for the longest overreaching zone to be covered by FDPSPDIS .
is the setting
³ ×
1.2 RFPE
min ZmRv
X1 . The reach will be X1/tan(60°) =X1/√(3).
RFPE for the overreaching zone to be covered, mostly zone 2.
261 the index ZmRv references the specific zone to
Section 7
Impedance protection
(Equation 259)
M13142-103 v5
(Equation 260)
M13142-151 v4
M13142-153 v2
M13142-156 v4
(Equation 261)
M13142-168 v2
M13142-170 v3
X1 . No extra
M13142-173 v4
279