Siemens 6MD85, Manual

Page: 632 / 1256

Several AREC signals can affect the setting for the
Threshold
and
Operate delay
parameters 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)
[loocp3kal-030311-01.vsd, 1, en_US]
Figure 7-74 Influence of the Cold-Load Pickup Detection on the Overcurrent-Protection Stage
In the case of cold-load pickup, you have the option to change the settings for the
Threshold
and
Operate
delay
parameters of the protection level. You can also block the level. To do so, you must activate the influ-
ence 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 5.8.1 Overview of Functions .
Link to an External
Function via a Binary Input Signal (Advanced Stage)
[loocp3bin-030311-01.vsd, 1, en_US]
Figure 7-75 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
parameters of the protection stage. You can also block the level. 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
7.4 Overcurrent Protection, Phases
632 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017