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CENELEC
EN 60255-149:2013

EN 60255-149:2013

Current

Current

The latest, up-to-date edition.

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

Published date

04-10-2013

Publisher

European Committee for Standards - Electrical

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FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Specification of the function
5 Performance specification
6 Functional test methodology
7 Documentation requirements
Annex A (informative) - Simple first-order thermal
        model of electrical equipment
Annex B (informative) - Thermal electrical relays
        which use temperature as setting parameters
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

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.

Committee
CLC/TC 95X
DevelopmentNote
Supersedes EN 60255-8. (10/2013)
DocumentType
Standard
PublisherName
European Committee for Standards - Electrical
Status
Current
Supersedes

IEC 60947-4-1:2009+AMD1:2012 CSV Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
EN 60085:2008 Electrical insulation - Thermal evaluation and designation
EN 61850-7-4:2010 Communication networks and systems for power utility automation - Part 7-4: Basic communication structure - Compatible logical node classes and data object classes
IEC 60085:2007 Electrical insulation - Thermal evaluation and designation
EN 60255-1:2010 Measuring relays and protection equipment - Part 1: Common requirements
IEC 61850-9-2:2011 Communication networks and systems for power utility automation - Part 9-2: Specific communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3
IEC 60947-4-2:2011 Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - AC semiconductor motor controllers and starters
IEC 60255-1:1967 Electrical relays - Part 1: Instantaneous all-or-nothing relays
IEC 61850-7-4:2010 Communication networks and systems for power utility automation - Part 7-4: Basic communication structure - Compatible logical node classes and data object classes
IEEE C37.96-2012 IEEE Guide for AC Motor Protection

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