Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

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9.7
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Reporting
Duration of Data Captures and Event Reports
TRI (Trigger Event Report) Command
Use the TRI command from any communications port to trigger the relay to
begin recording high-resolution raw data, traveling wave data, and event report
data. When testing with the
TRI command, you can gain information on power
system operating conditions that occur immediately after you issue the TRI com-
mand.
Duration of Data Captures and Event Reports
The relay stores unfiltered, high-resolution raw data (sampled at either 8 kHz,
4 kHz, 2 kHz, or 1 kHz), filtered event reports (available at both 4 samples/power
system cycle and at the relay processing interval, typically 8 samples/cycle), and
traveling wave data (1.5625 MHz). The number of stored high-resolution raw
data captures and event reports is a function of the amount of data contained in
each capture. You can configure the relay to record long data captures at high
sampling rates, although this reduces the total number of stored events you can
retrieve from the relay.
The rising-edge operator, R_TRIG, occurs in front of each of the elements in
the factory default ER equation. Rising-edge operators are especially useful
for generating an event report at fault inception. The triggering element
causes ER to assert, then clears the way for other elements to assert ER
because the relay uses only the beginning of a long element assertion. The
starting element in a continuously occurring fault does not mask other possi-
ble element triggers. This allows another rising-edge sensitive element to
generate another event report later in that same continuously occurring fault
(such as an overcurrent situation with the R_TRIG 51S01 element).
In the example factory default ER SEL
OGIC
control equation, if the Z3G ele-
ment remains asserted for the duration of the ground fault, the rising-edge
operator, R_TRIG, in front of Z3G causes ER to assert for only one process-
ing interval (a 1/8-cycle pulse). Other elements in the ER SEL
OGIC
control
equation can trigger event reports while the Z3G element remains asserted
throughout the fault duration.
You can also use the falling-edge operator, F_TRIG, to initiate data captures.
Example 9.2 Including PUL Command Triggering in the ER SEL
OGIC
Control Equation
This example shows you how to add the effect of the PUL command to emu-
late previous SEL relays. The relay asserts Relay Word bit, TESTPUL, when
any output is pulsed via the PUL command.
Program the Group settings SEL
OGIC
control equation ER as follows:
ER := R_TRIG Z2P OR R_TRIG Z2G OR R_TRIG 51S01 OR
R_TRIG Z3P OR R_TRIG Z3G OR TESTPUL Event Report Trig-
ger Equation (SEL
OGIC
Equation)
Example 9.1 Triggering Event Report/Data Capture Using the ER SEL
OGIC
Control Equation (Continued)