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  • BSI
    BS EN 60255-149:2013 Measuring relays and protection equipment - Functional requirements for thermal electrical relays
    Edition: 2013
    $500.66
    / user per year

Description of BS EN 60255-149:2013 2013

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.

Standard NumberBS EN 60255-149:2013
TitleMeasuring relays and protection equipment - Functional requirements for thermal electrical relays
StatusDefinitive
Publication Date2013-10-31
ReplacesBS EN 60255-8:1998
Identical National Standard OfIEC 60255-149:2013, EN 60255-149:2013
DescriptorsPerformance testing, Time, Thermal protection, Accuracy, Electrical testing, Electric current, Relays, Thermal testing, Switchgear, Protective relays, Error detection, Testing conditions, Current measurement, Switches, Working range, Electrical protection equipment, Standard tolerances, Measuring relays, Circuits, Operating time
ICS29.120.70 Relays
CommitteePEL/95
ISBN978 0 580 74965 0
PublisherBSI
Pages50

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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