Schweitzer Engineering Laboratories SEL-251 - Event Report; Event Report Triggering; Figure 2.13: Nomograph for Fault Locating

2-32 Specifications Date Code 20000421
SEL-251, -2, -3 Instruction Manual
for these changes. Fault studies are run for different fault locations on the distribution system.
Relay location voltage and current information is taken from the fault study and applied to the
relay. The resultant fault location from the relay fault locator is shown on the nomograph with
respect to the actual location.
Figure 2.13: Nomograph for Fault Locating
EVENT REPORT
The event report displays current and voltage quantities in primary units. The relay encodes
relay element states, outputs, and inputs using a simple process, making the report compact and
easy to interpret. Use the EVENT command to access the eleven cycle event reports. Use the
HISTORY command to list summary event reports. See Section 3: Communications for more
information on these commands.
Event Report Triggering
Set the variable ER(1246) to any OR-combination of elements in Relay Word rows R1, R2, R4,
and R6 to trigger an eve
nt report for any desired combination of conditions the relay can detect. Event reports also
trigger for:
• Any TRIP output
• Assertion of an input assigned to the ET function
• TRIGGER command execution
See Section 4: Event Reporting for more information on event reports.