EP 3176797 B1 20200902 - METHOD FOR MANUFACTURING A CURRENT TRANSFORMER CORE
Title (en)
METHOD FOR MANUFACTURING A CURRENT TRANSFORMER CORE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES STROMWANDLERKERNS
Title (fr)
PROCÉDÉ DE FABRICATION D'UN NOYAU DE TRANSFORMATEUR DE COURANT
Publication
Application
Priority
- JP 2014152849 A 20140728
- JP 2015071243 W 20150727
Abstract (en)
[origin: EP3176797A1] A manufacturing method of a current transformer core includes: the step of providing a core element formed by winding or layering a Fe-based amorphous alloy ribbon whose thickness is not more than 15 µm and which can be converted into nanocrystals; a longitudinal-field heat treatment step which includes performing a heat treatment on the core element in the presence of a magnetic field of not less than 100 A/m applied in a magnetic path direction of the core element, thereby forming a core; and a transverse-field heat treatment step which includes, after the longitudinal-field heat treatment step, performing a heat treatment on the core in the presence of a magnetic field applied in a direction perpendicular to the magnetic path direction of the core, thereby forming a core. µr(25) is adjusted by the transverse-field heat treatment step to a value between 0.4×µr(max)(25) and 0.9×µr(max)(25) where µr(max)(T) is µr(T) achieved by the longitudinal-field heat treatment step, and µr(T) is an amplitude magnetic permeability of the core measured at a temperature T (°C) in the presence of an AC magnetic field of frequency f=50 Hz and amplitude H=1.0 A/m.
IPC 8 full level
H01F 1/153 (2006.01); H01F 27/25 (2006.01); H01F 38/28 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP)
H01F 1/15308 (2013.01); H01F 1/15333 (2013.01); H01F 27/25 (2013.01); H01F 38/28 (2013.01); H01F 41/0213 (2013.01)
Citation (examination)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3176797 A1 20170607; EP 3176797 A4 20180321; EP 3176797 B1 20200902; CN 106575567 A 20170419; CN 106575567 B 20200512; ES 2833413 T3 20210615; JP 6491666 B2 20190327; JP WO2016017578 A1 20170615; WO 2016017578 A1 20160204
DOCDB simple family (application)
EP 15827190 A 20150727; CN 201580041111 A 20150727; ES 15827190 T 20150727; JP 2015071243 W 20150727; JP 2016538338 A 20150727