Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER
SEL-351 Instruction Manual
12-3
The elements in this example setting are:
51P Maximum phase current above pickup setting 51PP for phase time-overcurrent
element 51PT (see Figure 3.14).
51G Residual ground current above pickup setting 51GP for residual ground time-
overcurrent element 51GT (see Figure 3.18).
OUT3 Output contact OUT3 is set as a breaker failure trip output (see Figure 7.28).
Note the rising edge operator / in front of each of these elements. See Appendix G: Setting
SELOGIC Control Equations for more information on rising edge operators and SELOGIC Control
Equations in general.
Rising edge operators are especially useful in generating an event report at fault inception and then
generating another later if a breaker failure condition occurs. For example, at the inception of a
ground fault, pickup indicator 51G asserts and an event report is generated:
ER = ... + /51G + ... = logical 1 (for one processing interval)
Even though the 51G pickup indicator will remain asserted for the duration of the ground fault, the
rising edge operator / in front of 51G (/51G) causes setting ER to be asserted for only one
processing interval.
If the fault is not interrupted after the relay trips, then the relay outputs a breaker failure trip with
output contact OUT3 and another event report is generated:
ER = ... + /OUT3 = logical 1 (for one processing interval)
As stated earlier, the 51G pickup indicator is still asserted at the time of breaker failure trip, but
the rising edge operators allow each individual action to generate a separate event report.
Falling edge operators \ are also used to generate event reports. See Figure G.2 in Appendix G:
Setting SELOGIC Control Equations for more information on falling edge operators.
TRI (Trigger Event Report) and PUL (Pulse Output Contact) Commands
The sole function of the TRI serial port command is to generate standard event reports, primarily
for testing purposes.
The PUL command asserts the output contacts for testing purposes or for remote control. If output
contact OUT1 through OUT11 (Model 0351xT) or OUT101 through OUT107 (Models 0351x0,
0351x1, and 0351xY) asserts via the PUL command, the relay triggers a standard event report.
The PUL command is available at the serial port and the relay front-panel CNTRL pushbutton.
See Section 10: Serial Port Communications and Commands and Section 11: Front-Panel
Interface (Figure 11.3) for more information on the TRI (Trigger Event Report) and PUL (Pulse
Output Contact) commands.
Courtesy of NationalSwitchgear.com
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