EN 60255-149:2013

Measuring relays and protection equipment - Part 149: Functional requirements for thermal electrical relays

Publication date:   Jan 21, 2014

General information

60.60 Standard published   Oct 4, 2013

CENELEC

CLC/TC 95X Measuring relays and protection equipment

European Norm

29.120.70   Relays

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Scope

IEC 60255-149:2013 specifies minimum requirements for thermal protection relays. This standard includes specification of the protection function, measurement characteristics and test methodologies. The object is to establish a common and reproducible reference for evaluating dependent time relays which protect equipment from thermal damage by measuring a.c. current flowing through the equipment. Complementary input energizing quantities such as ambient, coolant, top oil and winding temperature may be applicable for the thermal protection specification set forth in this standard. This standard covers protection relays based on a thermal model with memory function.

Life cycle

PREVIOUSLY

WITHDRAWN
EN 60255-8:1998

NOW

PUBLISHED
EN 60255-149:2013
60.60 Standard published
Oct 4, 2013