Date Code 20001006
Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
3-53
SEL-351 Instruction Manual
Table 3.11: Frequency Elements Settings and Settings Ranges
Setting
Definition
Range
27B81P
undervoltage frequency element block
12.50 - 150.00 V secondary (wye-
connected voltages, {150 V voltage
inputs})
25.00 - 300.00 V secondary (wye-
connected voltages, {300 V voltage
inputs})
34.00 - 260.00 V secondary
(delta-connected voltages)
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 3.30.
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.
Summary of Contents for SEL-351
Page 14: ...Courtesy of NationalSwitchgear com ...
Page 16: ...Courtesy of NationalSwitchgear com ...
Page 40: ...Courtesy of NationalSwitchgear com ...
Page 74: ...Courtesy of NationalSwitchgear com ...
Page 146: ...Courtesy of NationalSwitchgear com ...
Page 186: ...Courtesy of NationalSwitchgear com ...
Page 220: ...Courtesy of NationalSwitchgear com ...
Page 304: ...Courtesy of NationalSwitchgear com ...
Page 340: ...Courtesy of NationalSwitchgear com ...
Page 380: ...Courtesy of NationalSwitchgear com ...
Page 450: ...Courtesy of NationalSwitchgear com ...
Page 506: ...Courtesy of NationalSwitchgear com ...
Page 528: ...Courtesy of NationalSwitchgear com ...
Page 534: ...Courtesy of NationalSwitchgear com ...
Page 536: ...Courtesy of NationalSwitchgear com ...
Page 550: ...Courtesy of NationalSwitchgear com ...
Page 562: ...Courtesy of NationalSwitchgear com ...
Page 570: ...Courtesy of NationalSwitchgear com ...
Page 584: ...Courtesy of NationalSwitchgear com ...
Page 602: ...Courtesy of NationalSwitchgear com ...