Sel SEL-421 - Fault Type; Fault Location Settings; Fault Location Relay Word Bit

R.1.19
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Fault Location
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 Tab le 1.16.
Table 1.16 Fault Type
Label Fau lt Type
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
Table 1.17 Fault Location Settings
Name Description Range
Default
(5 A)
Z1MAG Positive-Sequence Line Impedance
Magnitude ()
(0.25–1275)/I
nom
7.80
Z1ANG Positive-Sequence Line Impedance Angle () 5.00–90 84.00
Z0MAG Zero-Sequence Line Impedance
Magnitude ()
(0.25–1275)/I
nom
24.80
Z0ANG Zero-Sequence Line Impedance Angle () 5.00–90 81.50
EFLOC Fault Location Y, N Y
LL Line Length 0.10–999 100.00
Table 1.18 Fault Location Relay Word Bit
Name Description
RSTFLOC Fault locator analog quantity reset in progress.
a
a
Use global setting RSTFLOC shown in Table 10.11 on page R.10.8 to reset the stored fault
location analog quantity FLOC. Relay Word bit RSTFLOC will assert momentarily while the
clearing action proceeds.
When reset, the value contained in FLOC is set to a very large number (greater than 10
37
).
Resetting this value has no effect on the event reports stored in the SEL-421, nor does it
have an effect on DNP3 event access.