ABB RER670 Applications Manual page 132

Section 7
Impedance protection
126
RLd: It is used to set the resistive reach within the load impedance of load
discrimination characteristic. This setting can be calculated according to equation:
2
U
RLd 
min
0 8 .
P
max
IECEQUATION15051 V1 EN-US
Where,
P is the maximum exporting power
max
U is the minimum voltage for which P
min
0.8 is security factor.
ArgLd: This is used to set the load angle determining the load impedance area of
the load discrimination characteristic. Set the parameter to the maximum possible
load angle at maximum possible load. The default value is set at 30 deg.
OpModeI0: This is used to select the operation On or Off of the end zone timer
logic using residual overcurrent start to provide a remote backup.
OpModetEnd1: It is used to select operation On or Off of the end zone 1.
OpDirEnd1: This is used to select the direction mode of end zone 1. It can be set to
Non-directional, Forward and Reverse. It is recommended to set as Forward.
tEnd1: This is used to set time delay for the first stage remote backup. The setting
should allow the farthest zone to operate. The default setting is 2.5s.
OpModetEnd2: This is used to select the operation On or Off of the end zone 2.
OpDirEnd2: This is used to select the direction mode of the end zone 2. It can be
set to Non-directional, Forward and Reverse. It is recommended to set this as Non-
directional.
tEnd2: This is used to set the time delay for the second stage trip. It should be set in
coordination with the tEnd1 timer. The default setting is 3.0s.
OpModeGenSt: This is used to select On or Off of zone timers start by general start
signal. The default value is Off.
ZoneCharSym: This is used to select measuring zone Symmetry/Nonsymmetry
around R – X plane and it is set by default to Symmetry. With this default value, it
is not possible to set resistive and reactance reaches in reverse direction. However,
if it is needed to specify the reverse reaches depending on the application, it is
recommended to set this parameter to Nonsymmetry.
Start
CharStartZ<: It is used to select the underimpedance start characteristic (i.e.
Circular and Quadrilateral).
can occur
max
GUID-D2A63BD2-34EA-407C-B43F-165DCB576C4E v2
Railway application RER670 2.2 IEC
1MRK 506 375-UEN A
(Equation 17)
Application manual