Siemens 6MD85, Manual

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Table 7-6 Threshold Setting Range
Connection Type of the
Measuring Point
I-3ph
Ground Current CT Terminal Type Threshold Setting Range
(Secondary)
3-phase Calculated 4 * Protection 0.030 A to 35.000 A
3 * Protection, 1* sensitive 0.030 A to 35.000 A
4 * Measurement 0.001 A to 1.600 A
x + IN
x + IN-separate Measured 4 * Protection 0.030 A to 35.000 A
3 * Protection, 1* sensitive 0.001 A to 1.600 A
4 * Measurement 0.001 A to 1.600 A
Method of Measurement (Basic and Advanced Stage)
You use the
Method of measurement
parameter to define whether the stage uses the
fundamental
comp.
(standard method) or the calculated
RMS value
.
•
Measurement of the fundamental component:
This measuring procedure processes the sampled current values and filters out the fundamental compo-
nents numerically.
•
Measurement of the RMS value:
This measuring procedure determines the current amplitude from the sampled values according to the
defining equation of the RMS value. Harmonics are included in the analysis.
Directional Mode (Basic and Advanced Stage)
You can use the
Directional mode
parameter to define whether the stage works in a forward or reverse
direction.
The direction determination works across all stages (see chapter
7.7.3.2 Direction Determination ).
Blocking of the Stage (Basic and Advanced Stage)
The following blockings reset the picked up stage completely:
•
Externally or internally via the binary input signal
>Block stage
(see chapter 7.7.4.1 Description )
•
Measuring-voltage failure (see chapter 7.7.4.1 Description )
•
Via the dynamic settings functionality (only available in the advanced function type, see Influence of
Other Functions via Dynamic Settings and chapter
7.7.10 Influence of Other Functions via Dynamic
Settings )
Blocking of the Operate Delay (Basic and Advanced Stage)
You can use the binary input signal
>Block delay & op.
to prevent the start of the operate delay and thus
also the generation of the operate signal. A running operate delay is reset. The pickup is indicated. Fault
logging and fault recording take place.
Blocking of the Operate Delay and Operate Signal via the Device-Internal Inrush-Current Detection Function (Basic
and Advanced Stage)
Blocking of the operate delay and the operate signal via the device-internal Inrush-current detection function
is described in chapter
7.5.7.1 Description
Dropout Delay (Advanced Stage)
In case of undershooting of the dropout threshold, the dropout can be delayed. The pickup is maintained for
the specified time. The operate delay continues to run. If the operate delay expires while the pickup is still
maintained, the stage operates.
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
712 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017