Siemens 6MD85, Manual

Page: 552 / 1256

For operating modes with action time, the start of the action time(s) occurs with the pickup indications.
During operating modes with pickup, the pickup indications affect the selection of the dead times. During all
operating modes, the pickup indications are also required during the processing of faults and for supervision
during the reclaim time.
The automatic reclosing operating modes with pickup are only ideal for applications with 3-pole tripping.
Therefore, the outputs of the input logic always signal 3-pole operate indications.
[lobtaanr-010611-01.tif, 1, en_US]
Figure 7-33 Input Logic for Operating Modes: With Pickup
Start
In the Start function block, the automatic reclosing function is switched from the idle state AREC ready to the
state Dead time, see
Figure 7-34 . The length of the starting signals is controlled with a supervision time.
Start-Signal Supervision Time
The start-signal supervision stops the automatic reclosing if the short circuit is not switched off within the
normal time; for example, in the case of a circuit-breaker failure.
With the first raising operate indication, the start-signal supervision time is initiated, parameter
Start
signal supervis.time
. The time is stopped as soon as no operate indication is active.
The automatic reclosing function is blocked if there is an expiration of the start-signal supervision time
through a long operate indication. The blocking lasts until the operate indication stops, extended by a further
0.5 s.
7.2.4.5
Protection and Automation Functions
7.2 Automatic Reclosing Function
552 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017