Siemens 6MD85, Manual

Page: 665 / 1256

Several AREC signals can affect the setting for the
Threshold
and the
Operate delay
of the protection
stage and its blocking.
•
AREC is ready for reclosing 1 (= Automatic reclosing cycle 1)
•
AREC is ready for reclosing 2 (= Automatic reclosing cycle 2)
•
AREC is ready for reclosing 3 (= Automatic reclosing cycle 3)
•
AREC is ready for reclosing 4 (= Automatic reclosing cycle >3)
The following signal can only block the protection stage:
•
AREC is not ready or switched off (= Automatic reclosing off / not ready)
This means that if the AREC is ready and the protection stage is in the idle state, the settings for
AREC cycle 1
are active and not the standard settings. The standard settings are active in the case of
AREC
off/not ready
.
The influence can be activated for each signal individually. You also have to set the
Threshold
and
Operate
delay
or
Stage blocked
parameters, which take effect when the signal is active.
The way AREC signals are generated is described in chapter 7.2.1 Overview of Functions .
Link to the Device-Internal Function
Cold-Load Pickup Detection (Advanced Stage)
[lo_ocp_kal_gnd, 1, en_US]
Figure 7-88 Influence of the Cold-Load Pickup Detection on the Overcurrent-Protection Stage
You have the option of changing the settings for the
Threshold
and the
Operate delay
of the protection
stage for a cold-load pickup. You can also block the stage. To do so, you must activate the influence of the
cold-load pickup. You also have to set the
Threshold
and
Operate delay
or assign settings to
Stage
blocked
, which take effect when the signal is active.
The way signals are generated
Cold-load pickup
is described in chapter 5.8.9 Cold-Load Pickup Detection
(Optional) .
Link to an External
Function via a Binary Input Signal (Advanced Stage)
[loocpbingnd-030311-01.vsd, 1, en_US]
Figure 7-89 Influence of the Binary Input on the Overcurrent-Protection Stage
You can use the binary input signal
>Activ. dyn. settings
to change the settings for the
Threshold
and the
Operate delay
of the protection stage. You can also block the stage. To do so, you must activate
the influence of the binary input. You also have to set the
Threshold
and
Operate delay
or assign
settings to
Stage blocked
, which take effect when the signal is active.
Protection and Automation Functions
7.5 Overcurrent Protection, Ground
SIPROTEC 5, High-Voltage Bay Controller, Manual 665
C53000-G5040-C015-9, Edition 11.2017