ABB REL670 2.2 IEC - Page 211

Reactive reach
M13142-9 v4
The reactive reach in forward direction must as minimum be set to cover the
measuring zone used in the Teleprotection schemes, mostly zone 2. Equation 94
and equation
95 gives the minimum recommended reactive reach.
PHS Zm
X1 1.44 X1³ ×
EQUATION1309 V1 EN-US (Equation 94)
PHS Zm
X0 1.44 X0³ ×
EQUATION1310 V1 EN-US (Equation 95)
where:
X1
Zm
is the reactive reach for the zone to be covered by FDPSPDIS, and the constant
1.44 is a safety margin
X0
Zm
is the zero-sequence reactive reach for the zone to be covered by FDPSPDIS
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
M13142-103 v5
The resistive reach must cover RFPE for the overreaching zone to be covered,
mostly zone 2. Consider the longest overreaching zone if correct fault selection is
important in the application. Equation
96 gives the minimum recommended
resistive reach.
min
1.1
zm
RFFwPE RFPE³ ×
EQUATION1312 V2 EN-US (Equation 96)
where:
RFPE
Zm
is the setting RFPE for the longest overreaching zone to be covered by FDPSPDIS .
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
M13142-151 v4
Reactive reach
M13142-153 v2
The reactive reach in reverse direction is the same as for forward so no additional
setting is required.
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 205
Application manual