Configuration; Signals - ABB COM600 series User's & Technical Manual

4.7.
4.8.
38
COM600 series 5.1
Substation Analytics Technical Manual
Reliable information on the fault location greatly decreases the downtime of the protected
lines and increases the total availability of a power system.
SCEFRFLO can be applied as a device level solution or as a part of a system level
solution. In the device level applications, the physical fault distance (FLT_DISTANCE)
is calculated in the IED based on settings. A more accurate result can be expected if the
fault loop impedance (XFLOOP, RFLOOP) estimated by SCEFRFLO is utilized in the
system level fault location applications.
SCEFRFLO provides the distance to the fault together with the information about the
measuring loop that has been used in the calculation. Also, an estimate for the fault res-
istance at the fault point is calculated. In addition, both pre-fault and fault quantities of
voltages and currents are available for a post-fault analysis in the recorded data. The
validity of the estimated earth-fault distance is judged and reported together with the
fault distance estimate.

Configuration

SCEFRFLO requires three phase currents for operation. The phase currents can be
measured with conventional current transformers or Rogowski coils.
The full operation of SCEFRFLO requires that all three phase-to-earth voltages are
measured. The voltages can be measured with conventional voltage transformers or
voltage dividers connected between the phase and earth. Other alternative is to measure
phase-to-phase voltages and residual voltage (Uo). Both alternatives are When the Phase
voltage Meas setting is set to "PP without Uo" and only phase-to-phase voltages are
available, only short-circuit measuring loops (fault loops 12, 23, 31, 123) can be measured
accurately. In this case, the earth-fault loops (fault loops 1, 2, 3) cannot provide correct
fault distance estimates and the triggering of the function is automatically disabled.

Signals

Table 4.8-1 SCEFRLOC Input Signal
Name Type
R_AR_ON BOOLEAN
PREV_AR_STATU BOOLEAN
WT_COMTRADE BOOLEAN
Default Description
False Auto Reclose On, trig-
gering and blocking
logic for the FLOC
application
False Auto Reclose Status,
application blocking
logic
False Comrade file available,
application triggering
logic
1MRS758734