Schweitzer Engineering Laboratories SEL-351 - Synchronism Check Elements Settings

Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-39
SEL-351 Instruction Manual
Synchronism Check Elements Settings
Table 3.10: Synchronism Check Elements Settings and Settings Ranges
Setting Definition Range
25VLO low voltage threshold for “healthy
voltage” window
0.00 - 150.00 V secondary (wye-
connected voltages, {150 V voltage
inputs})
0.00 - 300.00 V secondary (wye-
connected voltages, {300 V voltage
inputs})
0.00 - 260.00 V secondary (delta-
connected voltages)
25VHI high voltage threshold for “healthy
voltage” window
0.00 - 150.00 V secondary (wye-
connected voltages, {150 V voltage
inputs})
0.00 - 300.00 V secondary (wye-
connected voltages, {300 V voltage
inputs})
0.00 - 260.00 V secondary (delta-
connected voltages)
25SF maximum slip frequency 0.005 - 0.500 Hz
25ANG1 synchronism check element 25A1
maximum angle
0° - 80°
25ANG2 synchronism check element 25A2
maximum angle
0° - 80°
SYNCP synchronizing phase
or
the number of degrees that synchronism
check voltage V
S
constantly lags voltage
V
A
(wye-connected voltages) or V
AB
(delta-connected voltages)
VA, VB, or VC (wye-connected
voltages)
VAB, VBC, or VCA (delta-
connected voltages)
0° - 330°, in 30° steps
TCLOSD breaker close time for angle
compensation
0.00 - 60.00 cycles
BSYNCH SELOGIC Control Equation block
synchronism check setting
Relay Word bits referenced in Table
9.3
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