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2 Functions
Inverse time over-
The logic of the inverse overcurrent stage also operates chiefly in the same way as
current stage I
the remaining stages. However, the time delay is calculated here based on the type of
P
the set characteristic, the intensity of the current and a time multiplier (following fig-
ure). A pre-selection of the available characteristics was already carried out during the
configuration of the protection functions. Furthermore, an additional constant time
delay T Ip Add or T 3I0p Add may be selected, which is added to the inverse time.
The possible characteristics are shown in the Technical Data.
The following figure shows the logic diagram. The setting parameter addresses of the
IEC characteristics are shown by way of an example. In the setting information (Sec-
tion 2.9.3) the different setting addresses are elaborated upon.
104
7SD610 Manual
C53000-G1176-C145-4
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