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With the
Slope 1
, you avoid an overfunction of the differential protection with low-current external faults as
a consequence of current-transformer transmission faults (stationary and dynamic faults). The default setting
of
0.30
is sufficient for many applications.
Parameter:
Intersection 2 Irest
•
Default setting
(_:11041:103) Intersection 2 Irest
=
2.50 I/Irated,obj
i
i
NOTE
If excessive current flows are cause to expect transmission problems for the current transformer, set
Slope
2
to a higher value.
The parameter
Intersection 2 Irest
determines from which restraint current the
Slope 2
begins. The
default setting
2.50 I/Irated,obj
is a practical value.
Parameter:
Slope 2
•
Default setting
(_:11041:102) Slope 2
=
0.70
With the parameter
Slope 2
, an overfunction of the differential protection is avoided with high-current
external faults as a consequence of current-transformer transmission faults (for example, due to saturation). A
value greater than or equal to double the value of
Slope 1
is practical. As the default setting,
0.70
was
selected.
[dwdifaus-030912-01.tif, 1, en_US]
Figure 7-66
Characteristic Curve with the Default Settings
Parameter:
Starting detection
•
Default setting
(_:11041:106) Starting detection
=
yes
Capacitor Bank Protection
7.8 Differential Protection for Capacitor Banks
1064
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Содержание 7SJ82
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