EP 0691662 B1 20010919 - Differential transformer for electronic protection device
Title (en)
Differential transformer for electronic protection device
Title (de)
Summenstromwandler für elektronische Schutzgeräte
Title (fr)
Transformateur différentiel pour appareil de protection électronique
Publication
Application
Priority
DE 4423622 A 19940706
Abstract (en)
[origin: EP0691662A1] The summing current transformer (1) has a wound closed core (2) of highly permeable soft magnetic material for detecting the sum of the currents which flow through wires (5, 6) which pass through the core. The wires connect the core winding to an amplifier (10) of a protection switch (7). The core is formed without insulating intermediate layers or air gaps which divide up the core cross section. The material of the core comprises a metallic alloy with a content of at least 40% nickel which has a positive temperature coefficient of the electrical resistance. <IMAGE>
IPC 1-7
IPC 8 full level
H01F 3/08 (2006.01); H01F 38/22 (2006.01); H01H 83/14 (2006.01)
CPC (source: EP US)
H01F 3/08 (2013.01 - EP US); H01F 38/22 (2013.01 - EP US); H01H 83/144 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0691662 A1 19960110; EP 0691662 B1 20010919; DE 4423622 A1 19960111; DE 59509601 D1 20011025; ES 2164123 T3 20020216; US 5576921 A 19961119
DOCDB simple family (application)
EP 95109486 A 19950620; DE 4423622 A 19940706; DE 59509601 T 19950620; ES 95109486 T 19950620; US 49889795 A 19950706