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3.2
50 Instantaneous Overcurrent - Phase
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 RMS 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, 7SR46 Device, Manual
C53000-G7040-C103-1, Edition 10.2022
3.2 50 Instantaneous Overcurrent - Phase
Functions
37
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