3-28 Breaker Logic Date Code 20010731
SEL-352-1, -2 Instruction Manual
Some examples of custom applications include using current and voltage separately to supervise
the thermal elements for the trip and close resistors, respectively. Another application entirely
different from the thermal logic is use of the settings to develop a synchronism checking element
that is based on a difference voltage and a timer. Refer to Section 4: Close Logic for a
description of this application.
Overpower Pickup (OPpu)
Range: 0–16383 cycles in 1/4-cycle steps
Use SET <ENTER> to access the OPpu time delay pickup timer setting. This setting delays
heating of the resistor thermal models for a settable time following 37OP and 87TH assertions.
This time delay allows thermal elements to ride through switching transients produced by
capacitively coupled voltage transformers (CCVT).
Close Pending Failure (26CP)
Range: 0.001–1000.000 J in 0.001-J steps (5 A)
0.002–200.000 J in 0.001-J steps (1 A)
Use SET <ENTER> to access the 26CP setting and establish the threshold at which the relay
asserts an alarm for pending close resistor failure.
Close Failure (26CF)
Range: 0.010–1000.000 J in 0.001-J steps (5 A)
0.002–200.000 J in 0.001-J steps (1 A)
Use SET <ENTER> to access the 26CF setting and establish the threshold at which the relay
asserts an alarm for close resistor thermal failure.
Trip Pending Failure (26TP)
Range: 0.010–1000.000 J in 0.001-J steps (5 A)
0.002–200.000 J in 0.001-J steps (1 A)
Use SET <ENTER> to access the 26TP setting and establish the threshold at which the relay
asserts an alarm for pending trip resistor failure.
Trip Failure (26TF)
Range: 0.010–1000.000 J in 0.001-J steps (5 A)
0.002–200.000 J in 0.001-J steps (1 A)
Use SET <ENTER> to access the 26TF setting and establish the threshold at which the relay
asserts an alarm for trip resistor thermal failure.
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