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Logic diagram of the I
Figure 2-41
1
)
Output indications associated with the pickup signals are listed in Table 2-3
2
)
Output indications associated with the trip signals are listed in Table 2-4
Directional inverse
The logic of the directional inverse overcurrent stage operates chiefly in the same way
time overcurrent
as the non-directional stages. However, triggering is not dependent on the result of the
stage I
ger
direction determination. Direction determination occurs via the measuring values and
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the respective directional characteristics.
However, the time delay is calculated here based on the type of the set characteristic,
the intensity of the current and a time multiplier D Ip Dir. or D 3I0p Dir.. Fur-
thermore, an additional constant time delay T Ip Add Dir. or T 3I0p Add Dir.
7SD610 Manual
C53000-G1176-C145-4
stage (inverse time overcurrent protection) - example of IEC curve
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2.9 Backup Time Overcurrent Protection
105
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