Schweitzer Engineering SEL-351P - Accuracy; Create Over- and Underfrequency Elements

3-48 Overcurrent, Voltage, Synchronism Check, and Frequency Elements Date Code 990430
SEL-351P Manual Técnico
Table SECTION 3: .10: Frequency Elements Settings and Settings Ranges
Setting Definition Range
27B81P undervoltage frequency element block 20.0 - 150.0 V secondary
81D1P frequency element 1 pickup 40.10 - 65.00 Hz
81D1D frequency element 1 time delay 2.00 - 16000.00 cycles, in
0.25-cycle steps
81D2P frequency element 2 pickup 40.10 - 65.00 Hz
81D2D frequency element 2 time delay 2.00 - 16000.00 cycles, in
0.25-cycle steps
81D3P frequency element 3 pickup 40.10 - 65.00 Hz
81D3D frequency element 3 time delay 2.00 - 16000.00 cycles, in
0.25-cycle steps
81D4P frequency element 4 pickup 40.10 - 65.00 Hz
81D4D frequency element 4 time delay 2.00 - 16000.00 cycles, in
0.25-cycle steps
81D5P frequency element 5 pickup 40.10 - 65.00 Hz
81D5D frequency element 5 time delay 2.00 - 16000.00 cycles, in
0.25-cycle steps
81D6P frequency element 6 pickup 40.10 - 65.00 Hz
81D6D frequency element 6 time delay 2.00 - 16000.00 cycles, in
0.25-cycle steps
Accuracy
Pickup: ±0.01 Hz
Timer: ±0.25 cycles and ±0.1% of setting
Create Over- and Underfrequency Elements
Refer to
Figure SECTION 3: .28.
Note that pickup settings 81D1P through 81D6P are compared to setting NFREQ. NFREQ is the
nominal frequency setting (a global setting), set to 50 or 60 Hz.