Voltage Protection: Over Fluxing (24); Figure 3-16 Inverse Over-Fluxing Characteristic (24It) - Siemens 7SR242 Duobias Technical Manual

3.10 Voltage Protection: Over Fluxing (24)

Optionally, three over fluxing elements are provided – 2 x 24DT and 1 x 24IT Char elements.
The 24DT Elements have a DTL characteristic. 24DT Setting sets the pick-up level and 24DT Delay the follower
time delay. An output is given if the Volts/Hertz ratio is above setting for the duration of the delay. The 24DT-n
Hysteresis setting allows the user to vary the pick-up/drop-off ratio for the element.
The 24IT Element has a user definable shape.
24Xn Point Setting sets the over fluxing (V/f) level for up to 7 user definable points.
24Yn Point Setting sets the operate time for each of the defined points.
The 24IT Reset setting can apply a, definite time delayed reset.
Operation of the over fluxing elements can be inhibited from:
Inhibit 24IT
Inhibit 24DT-n
User Inhibit
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Figure 3-16 Inverse Over-fluxing Characteristic (24IT)

A binary or virtual input.
A binary or virtual input.
Reylogic (graphical logic).
Chapter 1) 7SR242 Duobias Description Of Operation
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