EP 0111470 B1 19870304 - THERMAL PROTECTIVE DEVICE FOR TRANSFORMERS AND INDUCTANCES
Title (en)
THERMAL PROTECTIVE DEVICE FOR TRANSFORMERS AND INDUCTANCES
Publication
Application
Priority
AT 414282 A 19821115
Abstract (en)
[origin: US4549817A] An electrical component such as a transformer winding or choke coil is placed in a forced cooling circuit containing circulation pumps and coolers for a cooling medium and is subjected to forced circulation cooling. The thermal monitoring apparatus comprises a container housing therein a thermal sensor surrounded by a thermosensor winding. The container is connected by respective branch lines to the forced cooling circuit either upstream or downstream with respect to the circulation pumps. Cooling medium flows through the transformer or choke coil in the forced cooling circuit and through the branch lines leading to the container. Each branch line is provided with an equivalent hydraulic resistance of the transformer winding and the cooler. The thermosensor winding is connected to a current transformer which is supplied with a current which is proportional to the current flowing through the transformer or choke coil.
IPC 1-7
IPC 8 full level
G01R 31/06 (2006.01); G01R 31/28 (2006.01); H01F 27/00 (2006.01); H01F 27/12 (2006.01); H01F 27/40 (2006.01)
CPC (source: EP US)
H01F 27/402 (2013.01 - EP US); H01F 2027/404 (2013.01 - EP US); H01F 2027/406 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH DE FR IT LI SE
DOCDB simple family (publication)
EP 0111470 A2 19840620; EP 0111470 A3 19850109; EP 0111470 B1 19870304; AT 378623 B 19850910; AT A414282 A 19850115; DE 3370093 D1 19870409; JP S59112607 A 19840629; US 4549817 A 19851029
DOCDB simple family (application)
EP 83890212 A 19831115; AT 414282 A 19821115; DE 3370093 T 19831115; JP 21343583 A 19831115; US 55160183 A 19831114