Stage Description
Logic of the Stage
[lotrip3p-070611-01.tif, 1, en_US]
Figure 6-284
Logic Diagram for the External Trip-Initiation Stage
Binary Input Signal >External Trip
The binary input signal >External trip starts the Pickup and the Operate delay.
Blocking the Stage
The stage can be switched to ineffective via a number of signals. If the stage is in the pickup state at the time
of blocking, it will be immediately reset. However, the operate indication remains stopped for the minimum
operating time (_:102) Minimum operate time.
Application and Setting Notes
Parameter: Operate delay
•
Recommended setting value (_:901:6) Operate delay = 0.05 s
The Operate delay parameter must be set for the specific application. After expiry of the Operate delay
the time-out and tripping are signaled. The duration of the initiation signal as well as the adjustable minimum
command time determine the signal duration of the Operate.
6.44.3
6.44.4
Protection and Automation Functions
6.44 External Trip Initiation 3-Pole
SIPROTEC 5, Overcurrent Protection, Manual 881
C53000-G5040-C017-8, Edition 07.2017
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