Instantaneous Overcurrent Protection (50); Instantaneous Overcurrent Protection - Siemens Reyrolle 7SR45 Argus Device Manual

3.2

Instantaneous Overcurrent Protection (50)

Overview of the Function (50)
The instantaneous overcurrent protection is used to provide:
•
Short-circuit detection in electric equipment
•
High-speed highset overcurrent protection
•
Coordinated operation with other devices using current and time-graded settings
Structure of the Function (50)
The instantaneous overcurrent protection function element has group-dependent settings. These settings can
be different in each settings group – group numbers (Gn) 1 and 2.
The function monitors the primary system current using the 3-phase current transformer inputs, for example
CT1/2/3.
The instantaneous overcurrent protection function (50) is characterized by the following:
•
Current measurement is based on the fundamental component of the current.
•
Operation with a Definite Time Lag (DTL) characteristic.
•
LED operations are provided for each phase. A general pickup and 50-n output are provided.
Reyrolle, 7SR45, Device Manual
C53000-G7040-C101-2, Edition 09.2020

3.2 Instantaneous Overcurrent Protection (50)

Functions
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