Schweitzer Engineering Laboratories SEL-351 - Page 137

Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-59
SEL-351 Instruction Manual
Power Elements Settings
Table 3.13: Power Elements Settings and Settings Ranges
Settings Definition Range
PWR1P,PWR2P,
PWR3P,PWR4P
power element pickup OFF, 2.0 - 13000 VA secondary, single-phase
(5A nominal phase current inputs, IA, IB, IC)
OFF, 0.4 - 2600 VA secondary, single-phase
(1A nominal phase current inputs, IA, IB, IC)
PWR1T,PWR2T,
PWR3T,PWR4T
power element type +WATTS, -WATTS,
+VARS, -VARS
PWR1D,PWR2D,
PWR3D,PWR4D
power element time
delay
0.00 - 16000 cycles, in 0.25-cycle steps
The power element type settings are made in reference to the load convention:
+WATTS: positive or forward real power
-WATTS: negative or reverse real power
+VARS: positive or forward reactive power (lagging)
-VARS: negative or reverse reactive power (leading)
Accuracy
Pickup: +0.025 A • (voltage secondary) and +5% of setting at unity power factor (for PWRnT =
+WATTS or -WATTS) or power factor = 0 (for PWRnT = +VARS or -VARS)(5A
nominal phase current inputs, IA, IB, IC)
+0.005 A • (voltage secondary) and +5% of setting at unity power (for PWRnT =
+WATTS or -WATTS) or power factor = 0 (for PWRnT = +VARS or -VARS)(1A
nominal phase current inputs, IA, IB, IC)
Timer: +0.25 cycles and +0.1% of setting
Courtesy of NationalSwitchgear.com