50AFD Arc Flash Detection
Overview of Functions
Arc detector inputs and instantaneous overcurrent/earth fault protection elements are used to provide:
•
Detection of fault arcs in electrical switchgear
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Arc detector optical to electrical interface is connected between the arc flash detector and binary input
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Optional check of fault using high speed overcurrent and/or earth fault elements
•
Discriminative tripping and isolation of switchgear zones
•
Up to 6 zones of monitoring
Structure of the Function
The arc flash detection function has group dependent settings. These settings can be different in each settings
group – group numbers (Gn) 1 to 4.
This function corresponds to the logical node A50AFDSARC* in IEC 61850.
The light from arcs is detected using the 7XG31xx series of equipment being connected to the binary inputs –
see separate 7XG31 publications:
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7XG3120 Arc fault monitor relay
•
7XG3123 Arc fault interface module
•
7XG3124 Arc fault monitor
•
7XG3130 Arc sensor
Overcurrent check detectors are provided that are high speed and specific to the 50AFD function.
Outputs are available from the 50AFD current check elements.
Outputs are available from Zone ‘n’ flash inputs and current check detector elements (n = 1 to 6).
5.12
5.12.1
5.12.2
Protection and Automation Functions
5.12 50AFD Arc Flash Detection
216 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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