Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

Page: 138 / 706

3.58
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
Power Elements (Available in Firmware Version 7)
See Instantaneous/Definite-Time Overcurrent Elements on page 3.1 , and
SEL
OGIC
Control Equation Variables/Timers on page 7.28 for details on the
operation of these functions and their settings.
Accuracy
Single-Phase Power Elements (EPWR = 1, 2, 3, or 4)
Pickup:
Pickup setting 0.33–2VA {5 A nominal}, 0.07–0.4 VA {1 A nominal}:
±0.05 A • (
L-N
voltage secondary) and ±10% of setting at unity power
factor for power elements and zero power factor for reactive power
element {5 A nominal}
±0.01 A • ( L-N voltage secondary) and ±10% of setting at unity power
factor for power elements and zero power factor for reactive power
element {1 A nominal}
Pickup setting 2–13000 VA {5 A nominal}, 0.4–2600 VA {1 A nominal}:
±0.025 A • ( L-N voltage secondary) and ±5% of setting at unity power
factor {5 A nominal}
±0.005 A • (
L-N
voltage secondary) and ±5% of setting at unity power
factor {1 A nominal}
Three-Phase Power Elements (EPWR = 3P1, 3P2, 3P3, or 3P4)
Pickup:
Pickup setting 1–6 VA {5 A nominal}, 0.2–1 VA {1 A nominal}:
±0.05 A • (
L-L
voltage secondary) and ±10% of setting at unity power
factor for power elements and zero power factor for reactive power
element {5 A nominal}
±0.01 A • ( L-L voltage secondary) and ±10% of setting at unity power
factor for power elements and zero power factor for reactive power
element {1 A nominal}
Pickup setting 6–39000 VA {5 A nominal}, 1–7800 VA {1 A nominal}:
±0.025 A • ( L-L voltage secondary) and ±5% of setting at unity power
factor for power elements and zero power factor for reactive power
element {5 A nominal}
±0.005 A • ( L-L voltage secondary) and ±5% of setting at unity power
factor for power elements and zero power factor for reactive power
element {1 A nominal}
The quoted three-phase power element accuracy specifications are applicable
as follows:
➤
Wye-connected voltages (PTCONN = WYE): any conditions
➤
Open-delta connected voltages (PTCONN = DELTA), with
properly configured broken-delta 3V0 connection (VSCONN =
3V0): any conditions
➤
Open-delta connected voltages, without broken-delta 3V0
connection (VSCONN = VS): balanced conditions only