Schweitzer Engineering Laboratories SEL-701-1, Инструкция по эксплуатации

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SEL-701-1 Monitor
Date Code 20011009
Settings Calculation
RTD-Based Protection
3.42
Frequency Elements
The SEL-701-1 Monitor provides three over- or underfrequency elements with
independent pickup and time-delay settings. When an element pickup setting is less
than the Nominal Frequency setting, the element operates as an underfrequency
element. When the pickup setting is greater than the Nominal Frequency setting, the
element operates as an overfrequency element.
The monitor measures system frequency for these elements using the A-phase
voltage. All three elements are disabled if the applied ac voltage magnitude drops
below 20 V.
Table 3.32 Frequency Element Settings
Setting Prompt Setting Range
Setting Name =
Factory Default
Level 1 Pickup OFF, 20.00–70.00 Hz 81D1P = 59.10
Level 1 Time Delay 0.03–400.00 s 81D1D = 0.03
Level 2 Pickup OFF, 20.00–70.00 Hz 81D2P = OFF
Level 2 Time Delay 0.03–400.00 s 81D2D = 0.03
Level 3 Pickup OFF, 20.00–70.00 Hz 81D3P = OFF
Level 3 Time Delay 0.03–400.00 s 81D3D = 0.03