2 Functions
106
7SD610 Manual
C53000-G1176-C145-4
may be selected, which is added to the inverse time. The possible characteristics are
shown in the Technical Data.
The individual phase or earth specific directional indications (7240 to 7247) are used
to generate the indications „O/C Dir.forward“ or „O/C Dir.reverse“, if a valid
direction result (forward or backward) was determined for a phase or earth current.
These messages can then be transferred to a different device and there they can
cause an immediate trip if an overcurrent stage of the receiving device has also picked
up. The indications are then via CFC combined with a logical OR function.
The following figure shows the logic diagram of the directional I
P
.ger stages. The
setting parameter addresses of the IEC characteristics are shown by way of an exam-
ple. In the setting information (Section 2.9.3) the different setting addresses are elab-
orated upon.
The directional and the non-directional inverse overcurrent stageI
P
always uses the
same characteristic parameterized via the parameter2660 (IEC) or 2661 (ANSI).
Various inverse times and additional times can be configured.
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