Schweitzer Engineering Laboratories SEL-351 - Currents; Fault Location; Targets

Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER
SEL-351 Instruction Manual
12-5
Table 12.2: Event Types
Event Type Description
AG, BG, CG Single phase-to-ground faults. Appends T if TRIP asserted.
ABC Three-phase faults. Appends T if TRIP asserted.
AB, BC, CA Phase-to-phase faults. Appends T if TRIP asserted.
ABG, BCG, CAG Two phase-to-ground faults. Appends T if TRIP asserted.
TRIP Assertion of Relay Word bit TRIP (fault locator could not
operate successfully to determine the phase involvement, so
just TRIP is displayed).
ER SELOGIC Control Equation setting ER. Phase involvement is
indeterminate.
TRIG Execution of TRIGGER command.
PULSE Execution of PULSE command.
The event type designations AG through CAG in Table 12.2 are only entered in the “Event:” field
if the fault locator operates successfully. If the fault locator does not operate successfully, just
TRIP or ER is displayed.
Fault Location
The relay reports the fault location if the EFLOC setting = Y and the fault locator operates
successfully after an event report is generated. If the fault locator does not operate successfully,
$$$$$$ is listed in the field. If EFLOC = N, the field is blank. Fault location is based upon the
line impedance settings Z1MAG, Z1ANG, Z0MAG, and Z0ANG and corresponding line length
setting LL. For delta-connected voltages, additional zero-sequence source impedance settings
Z0SMAG and Z0SANG are required so that zero-sequence voltage can be derived for fault
locating. See the SET command in Table 9.1 and corresponding Settings Sheet 1 of 22 in Section
9: Setting the Relay for information on the line parameter settings.
Targets
The relay reports the targets at the rising edge of TRIP. The targets include: INST, COMM,
S0TF, 50, 51, and 81. If there is no rising edge of TRIP in the report, the Targets field is blank.
See Front-Panel Target LEDs in Section 5: Trip and Target Logic.
Currents
The “Currents (A pri), ABCNGQ:” field shows the currents present in the event report row
containing the maximum phase current. The listed currents are:
Phase (A = channel IA, B = channel IB, C = channel IC)
Neutral ground (N = channel IN)
Calculated residual ((I
G
= 3I
0
; calculated from channels IA, IB, and IC)
Negative-sequence (Q = 3I
2
; calculated from channels IA, IB, and IC)
Courtesy of NationalSwitchgear.com