Logic
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Figure 6-88
Logic Diagram of Instantaneous High-Current Tripping with Release Procedure via Protection
Interface
Release
If one of the following conditions is fulfilled, the stage is released (the internal Release signal is present) (for
further information, see chapter 5.8 Process Monitor):
•
No voltage has yet been applied to the protected object, which means that the remote circuit breakers
are open, or
•
Switching to the local circuit breaker is immanent.
These conditions are recognized internally if a circuit breaker is open or just closed
Furthermore, the stage can be activated externally via the >release binary input signal.
NOTE
To enable internal release of the stage, the devices at all ends of the protected object must be informed of
the circuit-breaker position (the circuit-breaker auxiliary contacts must be connected to the devices; the
respective binary input signals must be jumpered).
Method of Measurement, Threshold Value
The stage works with 2 different methods of measurement.
Protection and Automation Functions
6.9 Instantaneous High-Current Tripping
SIPROTEC 5, Overcurrent Protection, Manual 497
C53000-G5040-C017-8, Edition 07.2017
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