Minimum Operate Currents - ABB RELION 670 Series Applications Manual

1MRK 504 152-UEN B
ArgLd
ArgLd
IEC09000050 V1 EN-US
Figure 156: Load encroachment characteristic
The load angle
begin to calculate the setting for that parameter. Set the parameter to the maximum possible
load angle at maximum active load. A value bigger than 20° must be used.
The blinder in forward direction,
=
RLdFw
where:
P exp max is the maximum exporting active power
U min
0.8
The resistive boundary
calculated in the same way as
instead of maximum exporting power and the relevant Umin voltage for this condition.
7.10.4.2

Minimum operate currents

FRPSPDIS has two current setting parameters, which blocks the respective phase-to-earth
loop and phase-to-phase loop if the RMS value of the phase current (ILn) and phase difference
current (ILmILn) is below the settable threshold.
The threshold to activate the phase selector for phase-to-earth (
default value or a level to securely detect a single line-to-earth fault at the furthest reach of the
phase selection. It is recommended to set
The threshold for opening the measuring loop for phase-to-earth fault (
securely detect single line-to-earth fault at remote end on the protected line. It is
recommended to set
Application manual
X
RLdFw
RLdRv
ArgLd is the same in forward and reverse direction, so it could be suitable to
2
U min
×
0.8
P exp max
is the minimum voltage for which the Pexp max occurs
is a security factor to ensure that the setting of
resistive load.
RLdRv for load encroachment characteristic in reverse direction can be
RLdFw , but use maximum importing power that might occur
INBlockPP to double value of INReleasePE .
ArgLd
R
ArgLd
IEC09000050-1-en.vsd
RLdFw , can be calculated according to equation 256.
RLdFw can be lesser than the calculated minimal
IMinOpPP to double value of IMinOpPE .
Impedance protection
GUID-5B4DF48C-48ED-433D-92D8-B146E8A8A7E0 v1
IMinOpPE ) is set to the
INReleasePE ) is set
Section 7
275