EP 1719231 A1 20061108 - THERMAL OVERLOAD PROTECTION
Title (en)
THERMAL OVERLOAD PROTECTION
Title (de)
THERMISCHER ÜBERLASTSCHUTZ
Title (fr)
PROTECTION CONTRE UNE SURCHARGE THERMIQUE
Publication
Application
Priority
- FI 2005000066 W 20050201
- FI 20040154 A 20040202
Abstract (en)
[origin: WO2005074089A1] A thermal overload protection (1) for an electrical device, particularly an electric motor (M), measures (10) a load current supplied to the electrical device (M), and calculates (16) the thermal load on the electrical device on the basis of the measured load current, and shuts off (S2) a current supply (L1, L2, L3) when the thermal load reaches a given threshold level. The protection comprises a processor system employing X-bit, preferably X=32, fixed-point arithmetic, wherein the thermal load is calculated by a mathematic equation programmed into the microprocessor system structured such that a result or a provisional result never exceeds the X-bit value.
IPC 8 full level
H02H 7/085 (2006.01); H02H 6/00 (2006.01)
CPC (source: EP)
H02H 6/005 (2013.01)
Citation (search report)
See references of WO 2005074089A1
Citation (examination)
- US 6563685 B2 20030513 - GOTZIG BERNHARD [FR]
- WO 0124340 A1 20010405 - SIEMENS AG [DE], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005074089 A1 20050811; CA 2554117 A1 20050811; CA 2554117 C 20120814; CN 100539347 C 20090909; CN 1914778 A 20070214; EP 1719231 A1 20061108; FI 118659 B 20080131; FI 20040154 A0 20040202; FI 20040154 A 20050803
DOCDB simple family (application)
FI 2005000066 W 20050201; CA 2554117 A 20050201; CN 200580003832 A 20050201; EP 05708146 A 20050201; FI 20040154 A 20040202