[dwforrev-281013, 2, en_US]
Figure 7-108
Forward/Reverse Characteristic of the Directional Overcurrent Protection, Ground Function
Direction Determination with Negative-Sequence Values
The method works in the same way as for zero-sequence values. Instead of 3I0 and V0, the negative-sequence
values I2 and V2 are used for determining the direction.
Direction Determination for Test Purposes
If you activate the binary input signal
>Test of direction
, the direction is determined and indicated
even without the current threshold being exceeded in one of the stages. The direction can be determined as
soon as the zero-sequence current 3I0 and the zero-sequence voltage V0 exceeds approx. 7 % of the secon-
dary rated values of phase current and voltage.
Application and Setting Notes
Parameter:
Measured value
•
Recommended setting value
(_:9) Measured value
=
IN Measured
This parameter is not available in the basic function.
Parameter Value
Description
IN Measured
The function operates with the measured ground current IN. This is the
recommended setting unless there is a specific reason to use the calculated
zero-sequence current 3I0.
3I0 Calculated
The function operates with the calculated zero-sequence current 3I0. This
setting option can be used when applying a redundant 50N/51N function for
safety reasons.
Parameter:
Min. voltage V0 or V2
•
Recommended setting value
(_:2311:101) Min. voltage V0 or V2
=
2 V
7.7.3.3
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
SIPROTEC 5, High-Voltage Bay Controller, Manual
705
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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