Reactive reach
GUID-8C693495-10FA-47D5-BEFC-E72C8577E88B v1
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
gives the
minimum recommended reactive reach.
These recommendations are valid for both 60 and 90 deg. characteristic angle.
PHS
Zm
X1
1.44 X1
³
×
EQUATION1309 V1 EN-US
(Equation 292)
PHS
Zm
X0
1.44 X0
³
×
EQUATION1310 V1 EN-US
(Equation 293)
where:
X1
Zm
is the reactive reach for the zone to be covered by FRPSPDIS, and the constant
1.44
is a safety margin
X0
Zm
is the zero-sequence reactive reach for the zone to be covered by FRPSPDIS
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
GUID-CB13A35F-0BF8-4CFA-9311-EADE194C1D85 v1
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
gives the minimum recommended resistive reach.
A) 60 degrees
1.1
Zm
RFFwPE
RFPE
³
×
EQUATION2223 V2 EN-US
(Equation 294)
B) 90 degrees
(
)
1
2
1
0
3
Zm
Zm
Zm
RFFwPE
R PE
R PE
RFPE
> ×
×
+
+
EQUATION2224 V2 EN-US
(Equation 295)
The security margin has to be increased in the case where φloop<60° to avoid that FRPSPDIS
characteristic cuts off some part of the zone measurement characteristic.
RFFwPP and RFFRvPP must be set in a way that the loop characteristic angle can be 60
degrees (or alternatively the same or lower compared to the measuring zone that must be
covered). If the characteristic angle for IEDs in the 500 series of 90 degrees is desired,
RFFwPP
and
RFFRvPP must be set to minimum setting values.
7.10.3.2
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 505 343-UEN B
Section 7
Impedance protection
291
Application manual
Summary of Contents for Relion 670 series
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