Siemens 7SJ85 - Instantaneous High-Current Tripping; Overview of Functions; Structure of the Function

Instantaneous High-Current Tripping
Overview of Functions
The Instantaneous high-current tripping function has the following tasks:
•
Instantaneous tripping when switching onto an existing fault, for example, if a grounding switch is
closed.
•
Instantaneous disconnection of high currents above the highest overcurrent-protection stage.
Structure of the Function
The Instantaneous high-current tripping function offers 2 different increment types:
•
Stage with standard release method
•
Stage with release method via protection interface (only applicable if the device is equipped with a
protection interface)
The function with the stage for the standard release procedure is factory-set.
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Figure 6-86 Structure/Embedding of the Function
6.9
6.9.1
6.9.2
Protection and Automation Functions
6.9 Instantaneous High-Current Tripping
SIPROTEC 5, Overcurrent Protection, Manual 493
C53000-G5040-C017-8, Edition 07.2017