Siemens 6MD85, Manual

Page: 683 / 1256

Additional Time Delay (Advanced Stage)
With the parameter
Additional time delay
, you define a definite-time delay in addition to the inverse-
time delay. With this setting, the whole curve is shifted on the time axis by this additional definite time.
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 7.6.3.1 Description )
•
Measuring-voltage failure (see chapter 7.6.3.1 Description )
•
Via the functionality of the
dynamic settings
(only in the advanced function type, see subtitle Influ-
ence of other functions via dynamic settings and chapter 7.4.8.1 Description ).
Blocking of the Time Delay (Basic and Advanced Stage)
You can use the binary input signal
>Block delay & op.
to prevent the start of the time delay and thus
also the operate signal. A running time delay is reset. The pickup is indicated and a fault record is opened.
Blocking of the Operate Delay and the 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
7.4.7.1 Description .
Application and Setting Notes
Parameter: Directional mode
•
Default setting
(_:8161:111) Directional mode
=
forward
You use the
Directional mode
parameter to define the directional mode of the stage.
Parameter Value Description
forward
Select this setting if the stage is to work in a forward direction (in the direc-
tion of the line).
reverse
Select this setting if the stage is to work in a reverse direction (in the direc-
tion of the busbar).
Parameter:
Method of measurement
•
Recommended setting value
(_:8161:8) Method of measurement
=
fundamental comp.
With the
Method of measurement
parameter, you define whether the stage uses the
fundamental
comp.
(standard method) or the calculated
RMS value
.
Parameter Value Description
fundamental comp.
Select this method of measurement if harmonics or transient current peaks
are to be suppressed.
Siemens recommends using this method as the standard method.
RMS value
Select this method of measurement if you want the stage to take harmonics
into account (for example, at capacitor banks). Consider that aperiodic DC
components present in the secondary circuit are measured and can cause
an overfunction.
For this method of measurement, do not set the
threshold value
of the
stage to less than 0.1 I
rated,sec
. If currents from more than one measuring
point are added up in the current interface of a function group, the setting
value should not be set lower than 0.1 I
rated,sec
multiplied by the number of
added currents.
7.6.5.2
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 683
C53000-G5040-C015-9, Edition 11.2017