EP 0257291 B1 19910320 - CIRCUIT ARRANGEMENT FOR THE WIRING OF HIGH POWER TRANSFORMERS
Title (en)
CIRCUIT ARRANGEMENT FOR THE WIRING OF HIGH POWER TRANSFORMERS
Publication
Application
Priority
DE 3625845 A 19860730
Abstract (en)
[origin: EP0257291A1] High power transformers normally contain a low-voltage winding (12), a high-voltage main winding (13) and a tapped winding (14). If the tapped winding is operated in a subtractive and additive manner, when the transformer is excited with an oscillating switching voltage at the resonant frequency of the tapped winding (14), particularly when it is connected subtractively, high voltage amplitudes with respect to earth can occur along the tapped winding (14) at the end of the main winding (13). To reduce and damp-out such resonant frequency oscillations, in the case of known arrangements either each stage or the complete tapped winding (14) was connected in parallel with an R-C element (19, 20). According to the invention, it is now intended that only a single stage of the multi-stage tapped winding (14) is connected in parallel with an R-C element (19, 20), which R-C element also reduces the resonant amplitudes occurring in the other stages because of the transformer coupling between this stage and the other stages. The use of the circuit arrangement according to the invention is expedient in the case of large transformers. This is particularly true in all cases in which a multi- stage tapped winding (14) is provided connected additively and subtractively with respect to the high voltage main winding (13). <IMAGE>
IPC 1-7
IPC 8 full level
H01F 27/34 (2006.01); H01F 29/02 (2006.01)
CPC (source: EP)
H01F 27/343 (2013.01); H01F 29/02 (2013.01)
Citation (examination)
EP 0141296 A1 19850515 - TRANSFORMATOREN UNION AG [DE]
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0257291 A1 19880302; EP 0257291 B1 19910320; AT E61886 T1 19910415; BR 8703907 A 19880405; DE 3768736 D1 19910425; ES 2020972 B3 19911016; GR 3001869 T3 19921123; PT 85439 A 19880729; PT 85439 B 19930930
DOCDB simple family (application)
EP 87110408 A 19870717; AT 87110408 T 19870717; BR 8703907 A 19870729; DE 3768736 T 19870717; ES 87110408 T 19870717; GR 900401181 T 19910426; PT 8543987 A 19870729