IEC 60255-149:2013 ED1

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

Publication date:   Jul 30, 2013

General information

60.60 Standard published   Jul 30, 2013

IEC

TC 95

International Standard

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WITHDRAWN
IEC 60255-8:1990 ED2

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PUBLISHED
IEC 60255-149:2013 ED1
60.60 Standard published
Jul 30, 2013