EP 0114648 A3 19840829 - ONLOAD TAP-CHANGING TRANSFORMER
Title (en)
ONLOAD TAP-CHANGING TRANSFORMER
Publication
Application
Priority
JP 808183 A 19830122
Abstract (en)
[origin: EP0114648A2] An onload tap-changing transformer comprises a high voltage winding (2) a low voltage winding (1) wound on an iron core (C) a coarse tap winding (3) wound on the iron core and connected in series with the high voltage winding, and a fine tap winding (4) wound on the iron core and selectively connectable to the high voltage winding or the low voltage winding by a switch (S). The conductors making up the coarse tap winding and the conductors making up the fine tap winding are wound together, in juxtaposed relation with each other, into at least one integrated disc winding assembly and taps are led out of predetermined points of the fine tap winding, thereby inceasing the capacitance between the coarse tap winding and the fine tap winding so that the transfer voltage generated upon application of a lightning impulse and the potential difference between the windings are reduced, thus preventing any corona or dielectric breakdown.
IPC 1-7
IPC 8 full level
H01F 29/04 (2006.01); H01F 27/34 (2006.01); H01F 29/02 (2006.01)
CPC (source: EP)
H01F 27/343 (2013.01); H01F 29/02 (2013.01)
Citation (search report)
- [A] US 3621428 A 19711116 - JOHNSTON ROBERT L, et al
- [A] GB 1011375 A 19651124 - SMIT & WILLEM & CO NV
- [A] DE 2944812 A1 19800514 - HITACHI LTD
- [A] DE 2841592 A1 19800327 - TRANSFORMATOREN UNION AG
- [A] US 3271659 A 19660906 - JOSEPH PHILIPS HENRI
- [A] PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 211(E-137)(1089), 23rd October 1982 & JP 57 115 807 A (HITACHI SEISAKUSHO K.K.) 19-07-1982
- [A] PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 247(E-146)(1125), 7th December 1982 & JP 57 147200 A (TOKYO SHIBAURA DENKI K.K.) 11-09-1982
Designated contracting state (EPC)
DE SE
DOCDB simple family (publication)
EP 0114648 A2 19840801; EP 0114648 A3 19840829; EP 0114648 B1 19870422; DE 3463311 D1 19870527; IN 159670 B 19870530; JP H023285 B2 19900123; JP S59134808 A 19840802
DOCDB simple family (application)
EP 84100454 A 19840117; DE 3463311 T 19840117; IN 40CA1984 A 19840119; JP 808183 A 19830122