Schweitzer Engineering Laboratories SEL-421-4 - Page 1070

9.6
SEL-400 Series Relays Instruction Manual Date Code 20171006
Reporting
Triggering Data Captures and Event Reports
Triggering Data Captures and Event Reports
Oscillograms and event reports are triggered both internally and externally
depending on the event trigger that you program in the relay.
Use an event trigger to initiate capturing power system data. High-resolution raw
data oscillography and event reports use the same triggering methods. The trigger
for data captures comes from three possible sources:
➤ Relay Word bit TRIP assertions
➤ SELOGIC control equation ER (Event Report Trigger)
➤ TRI command
In some SEL relays, the PUL command initiated event recording. If you want the
PUL command to initiate data capture, add the Relay Word bit TESTPUL to the
SEL
OGIC control equation ER.
Relay Word Bit TRIP
If Relay Word bit TRIP asserts, the relay automatically generates a data capture
event trigger on the rising edge of the TRIP Relay Word bit state change. In every
instance, TRIP causes the relay to begin recording data. You therefore do not
have to enter any condition that causes a trip in the ER SEL
OGIC control equa-
tion.
SELOGIC Control Equation ER
Program the SELOGIC control equation ER to trigger high-resolution raw data
oscillography, traveling wave data oscillography, and standard event reports for
conditions other than TRIP conditions. When ER asserts, the relay begins record-
ing data if the relay is not already capturing data initiated by another trigger.
Example 9.1 Triggering Event Report/Data Capture Using the ER SELOGIC
Control Equation
This example shows how the elements in the ER SELOGIC control equation
initiate relay data capture.
An example of a factory default setting for Group setting SEL
OGIC control
equation ER in the SEL-411L is
ER := R_TRIG Z2P OR R_TRIG Z2G OR R_TRIG 51S01 OR
R_TRIG Z3P OR R_TRIG Z3G Event Report Trigger Equation
(SEL
OGIC Equation)
The element transitions in this setting are from the following Relay Word
bits:
➤ Z2P, Z3P: Zone 2 phase-distance element, Zone 3 phase-
distance element
➤ Z2G, Z3G: Zone 2 ground-distance element, Zone 3 ground-
distance element
➤ 51S01: Instantaneous output of Inverse-Time Overcurrent
Element 1