IEC 60050-445 pdf download

IEC 60050-445 pdf download International Electrotechnical Vocabulary – Part 445: Time relays
1Scope
This part of lEC 60050 defines terms related to specified-time relays.
ln the past, IEC 60050-446(Part 446 of the lEV) listed the terminology for all types of electricalrelays. In order to improve the precision of terms and definitions as well as the general visibilityof relay terminology, it had been decided to split that part of the lEV into three separate partsoptimised for the specific relay types covered.
Therefore, this part of lEC 60050 gives terms and definitions for (specified) time relayssuperseding the terminology of lEC 60050-446 for such relays.
The terminology for elementary relays (non-specified time all-or-nothing relays) is contained inIEC 60050-444.A new part for measuring relays (IEC 60050-447) is also under preparation.When all these three parts are published, IEC 60050-446 shall be withdrawn.
This standard is intended to define the most common time relay functions,and not all possiblecombinations.
Normative references
The following referenced documents are indispensable for the application of this document. Fordated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
IEC Guide 108,Guidelines for ensuring the coherency of lEC publications – Application ofhorizontal standards
3 Terms and definitions
Termes et définitions
SECTION 445-01 – TYPES DE RELAIS TEMPORISÉS
SECTION 445-01 – TIME RELAY TYPES
445-01-01
relais temporisé, m
relais de tout ou rien comportant une ou plusieurs fonctions temporelles
time relay
specified-time relay
all-or-nothing relay with one or more time functions