Siemens 6MD85, Manual

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Parameter:
Directional comparison
,
Release via input signal
•
Default setting
(_:4861:104) Directional comparison
=
no
•
Default setting
(_:4861:106) Release via input signal
=
no
The parameters
Directional comparison
and
Release via input signal
are not visible for the
basic stage.
You can use these settings to define whether the stage is to be used for directional comparison protection.
Directional comparison protection is performed via the
Direction
and
>Release delay & op.
signals.
Parameter Value Description
no
The stage is not used for directional comparison protection.
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 available.
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 enable information from the opposite end
(forward information from the
Direction
output signal).
See also the application example in chapter 7.6.10 Application Notes for
Directional Comparison Protection
Parameter:
Dynamic settings
•
Default setting
(_:4861:26) 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 overcurrent-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
,
Operate
delay
, 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
(_:4861:27) 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 trans-
former. This applies, for example, to the high-current stage that is set
according to the short-circuit voltage Vsc 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 short-circuit current.
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
714 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017