1975   Modes "blocked" and "test/blocked" impact electrical outputs only, not data

Created: 25 Apr 2025

Status: Discussion (red)

Part: Part 7-4 (2020; Edition 2.1)

Links:

Page: 454

Clause: Annex A

Paragraph: Table A.1, Table A.2

Issue

There is ambiguity whether modes "blocked" and "test/blocked" block electrical outputs only (relays, analogue outputs e.g.) or whether these modes additionally block the output of data.

Proposal

Clarify whether the output of data is impacted by the modes "blocked" and "test/blocked".

Marking of "q.test" = "true" by LN instances the modes of which are "test" or "test/blocked" is not under question here.

Clarity could be achieved by a statement in Annex A.

Discussion Created Status
Change to "discussion" 02 May 25 Discussion (red)
It is stated that wired (electrical) outputs to process (switchgear) are considered. The intention is to model a test plug, what is often used testing (e.g. test of in protection settings and functions).
Data that are used to communicate information to other functions in different IEDs are not considered.
02 May 25 Accepted

 

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