ABB RELION RET670, Applications Manual

Page: 373 / 1016

= ×
2
min
0.8
exp max
RLdFwd
P
V
where:
Pexp max is the maximum exporting active power
Vmin
is the minimum voltage for which the Pexp max occurs
0.8 is a security factor to ensure that the setting of
RLdFwd can be lesser than the calculated
minimal resistive load.
The resistive boundary RLdRev for load encroachment characteristic in reverse
direction can be calculated in the same way as RLdFwd , but use maximum importing
power that might occur instead of maximum exporting power and the relevant Vmin
voltage for this condition.
8.11.3.3 Minimum operate currents
M13142-334 v5
FDPSPDIS (21) has two current setting parameters which blocks the respective phase-
to-ground 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-ground ( IMinPUPG ) is set to
securely detect a single phase-to-ground fault at the furthest reach of the phase
selection. It is recommended to set
IMinPUPP to double value of IMinPUPG .
The threshold for opening the measuring loop for phase-to-ground fault
(
3I0Enable_PG ) is set securely detect single line-to-ground fault at remote end on the
protected line. It is recommended to set 3I0BLK_PP to double value of 3I0Enable_PG .
8.12 High speed distance protection ZMFPDIS (21)
GUID-CC4F7338-2281-411D-B55A-67BF03F31681 v4
8.12.1 Identification
GUID-8ACD3565-C607-4399-89D2-A05657840E6D v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
High speed distance protection zone ZMFPDIS
S00346 V1 EN-US
21
1MRK 504 163-UUS A
Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 367
Application manual