Siemens 6MD85, Manual

Page: 724 / 1256

Parameter Value Description
yes
If the
Directional comparison
parameter is set to
yes
, the
Release via input signal
parameter, the
Direction
output
signal, and the
>Release delay & op.
input signal become avail-
able.
If the
Release via input signal
parameter is set to
yes
, the
starts of the operate delay and operate signal are only enabled when
the
>Release delay & op.
input signal is active. The
>Release
delay & op.
input signal must be connected to the release informa-
tion from the opposite end (forward information from the
Direc-
tion
output signal).
See also the application example in chapter 7.6.10 Application Notes
for Directional Comparison Protection .
Parameter:
Dynamic settings
•
Default setting
(_:4891:26) Dynamic settings
=
no
This parameter is not visible for the basic stage.
Parameter Value Description
no
The influence on the overcurrent-protection stage by device-internal
or external functions is not necessary.
yes
If a device-internal function (Automatic reclosing or Cold-load
pickup detection) or an external function should affect the overcur-
rent-protection stage (such as change the setting of the threshold
value or operate delay, blocking of the stage), the setting must be
changed to
yes
.
This makes the configuration parameters affected by Auto reclosing/
Cold-load PU/Binary input as well as the dynamic settings
Threshold
,
Time dial
, and
Stage blocked
of the stage visible
and enables the settings to be set for the specific influence.
For further setting notes, refer to chapter 7.5.8.2 Application and Setting Notes (Advanced Stage) of the func-
tion Overcurrent Protection, Ground.
Parameter:
Blk. w. inrush curr. detect.
•
Default setting
(_:4891:27) Blk. w. inrush curr. detect.
=
no
Parameter Value Description
no
The transformer inrush-current detection does not affect the stage.
Select this setting in the following cases:
•
In cases where the device is not used on transformers.
•
In cases where the device is used on transformers and the
threshold value of the stage is set above the maximum inrush
current of the transformer. This applies, for example, to the high-
current stage that is set according to the short-circuit voltage V
sc
of the transformer in such a way that the stage only picks up on
faults from the high-voltage side. The transformer inrush current
cannot become larger than the maximum transmittable shortcir-
cuit current.
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
724 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017