Sel 411L - Table 3.61 Fault Type

P.3.131
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
Fault Location
For two-terminal lines, three-terminal lines, and four-terminal lines with one
tap point, the relay calculates the distance to the fault in per unit of the
positive-sequence line impedance Z1RTMAG. For four-terminal lines with
two tap points, the relay calculates the distance to the fault in per unit of the
positive-sequence line impedance Z1TTMAG (see Table 3.62 and Table 3.63).
Use the relay setting LLR, line length, to determine the units that the relay
reports for the distance to a fault. For example, if a fault occurs at the midpoint
of the protected line and you set LLR to 126 for a line length of 126
kilometers, the result of the relay distance-to-fault calculation is 63.
Distance-to-fault calculation results range from –999.99 to 999.99. If the
calculation cannot be determined (e.g., insufficient information) or if the
result is outside the specified range, the relay reports the fault location as
$$$$.$$.
The relay provides an analog fault location value from the most recent event
report, labeled FLOC.
The relay specifies fault type along with the distance to fault. The fault type
can be one of the types listed in Table 3.61.
The relay performs multi-ended fault location calculations if all three of the
following conditions are true for 4 cycles before the trigger (TR or ER) to 15
cycles after the trigger:
➤ 87MTR RWB is asserted
➤ 87FLSOK RWB is asserted
➤ 87EFD RWB is deasserted
The following description applies to a multisegmented line. When in the
master mode, the relay calculates the fault location for the line segment that it
is on. The event summary shows
LOCAL in the “From” field to indicate that the
fault is for the line segment that the relay is on.
Event:
AG T Location: 39.77 From: LOCAL FLM: ME
If the fault is on a different line segment, the relay requests the fault location
from the remote relays and displays the following.
Event:
AG T Location: 49.77 From: REMOTE 1 FLM: ME
In this case, the fault is on the line segment of the relay labeled Remote 1, and
the fault distance is 49.77 units from the Remote 1 relay.
Ta b l e 3. 6 1 Fa u l t Ty p e
Label Fault Typ e
AG A-phase-to-ground
BG B-phase-to-ground
CG C-phase-to-ground
AB A-phase-to-B-phase
BC B-phase-to-C-phase
CA C-phase-to-A-phase
ABG A-phase-to-B-phase-to-ground
BCG B-phase-to-C-phase-to-ground
CAG C-phase-to-A-phase-to-ground
ABC Three-phase