| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 06/14/2000 | EP1008219A1 Device and method relating to protection of an object against over-currents comprising over-current reduction |
| 05/23/2000 | US6066945 Method and device for automatically switching three-phase voltage for power saving transformer |
| 05/17/2000 | CN2378814Y Non-excitation tap changer |
| 05/17/2000 | CN1253056A Output choking coil for use on D. C. welding machine and method for using same |
| 05/17/2000 | CN1052588C Regulating method for stepping switch |
| 05/16/2000 | US6062821 Integral oil filter-pump system |
| 05/10/2000 | EP0999564A1 Output choke for a direct current welding device and method for adjusting the inductivity in the electrical output circuit of a direct current welding device |
| 05/04/2000 | WO2000025328A1 Controlled reactor |
| 05/03/2000 | CN1052099C HF choke coil |
| 04/26/2000 | CN2376059Y Tap changer |
| 04/20/2000 | DE19947285A1 Auto-transformer with uninterrupted voltage step conversion for illumination systems |
| 04/19/2000 | EP0994495A2 Electrical contact |
| 04/06/2000 | WO2000019459A1 A switchable flux control for high power static electromagnetic devices |
| 04/06/2000 | WO2000019458A1 Permanent magnetic core device |
| 04/05/2000 | CN2372772Y Non-excitation shunting switch |
| 03/29/2000 | CN2371655Y Magnetic circuit voltage regulator |
| 03/08/2000 | CN2368147Y Reactor with magnetic core |
| 03/08/2000 | CN2368146Y Controller and control-cabinet integrated on-load tap-changing switch |
| 03/08/2000 | CN2368145Y Switchover mechanism for on-load tap-changing switch without transition load |
| 03/08/2000 | CN1246956A Winding in transformer or inductor |
| 03/07/2000 | US6034858 Current transformer, trip device and circuit breaker comprising such a transformer |
| 03/01/2000 | CN2366954Y 可变电抗器 Varactors |
| 03/01/2000 | CN1246213A Device and method relating to protection of object against over-currents comprising over-current reduction and current limitation |
| 03/01/2000 | CN1246212A Device and method relating to protection of object against over-currents comprising over-current reduction |
| 03/01/2000 | CN1246211A Device and method relating to protection of object against over-currents comprising over-current reduction |
| 03/01/2000 | CN1246210A Device and method relating to protection of object against over-currents comprising over-current reduction and current limitation |
| 03/01/2000 | CN1246199A Flux-controlled variable transformer |
| 02/24/2000 | WO2000010182A1 Step switch with selector |
| 02/24/2000 | CA2340262A1 Step switch with selector |
| 02/23/2000 | CN2365746Y Induction voltage regulating integral apparatus for test |
| 02/09/2000 | EP0978131A1 Circuit arrangement for a load transfer switch |
| 02/09/2000 | CN2363363Y No-field tapping switch |
| 02/02/2000 | CN2362182Y Disk-type strobe unit of on-load tap changer |
| 02/02/2000 | CN1243324A Transformer |
| 01/20/2000 | DE19932594A1 Saturable choke for pulsed laser |
| 01/19/2000 | EP0973251A2 Start-up circuit with start-up transformer for three phase squirrel cage motor |
| 01/19/2000 | CN2359789Y Magnetic voltage regulator with magnetic shunt |
| 01/13/2000 | DE19831121A1 Mehrstufige Anlaufschaltung mit Anlauftransformator für einen Drehstrom-Kurzschlußläufermotor Multi-stage start-up circuit with start-up transformer for a three-phase squirrel-cage induction motor |
| 01/12/2000 | EP0970493A1 An arrangement at a conductor on high voltage potential |
| 01/12/2000 | EP0970491A1 A controllable inductor |
| 01/12/2000 | CN2358534Y Air-gap-adjusting arc suppression coil |
| 01/05/2000 | EP0969486A1 Flux-controlled variable tranformer |
| 01/05/2000 | CN1048111C Phase-shifting transformer and protection system of phase-shifting transformer |
| 12/29/1999 | CN2356412Y Concaved guide rule on switchover switch in loaded tapping switch |
| 12/29/1999 | CN2356411Y Slot position limiting rack for tapping selector in loaded switch |
| 12/29/1999 | CN2356410Y Switching and selecting synchronous device for loaded tapping switch |
| 12/15/1999 | CN2354221Y Contact voltage-regulator |
| 12/07/1999 | US5999077 Voltage controlled variable inductor |
| 12/07/1999 | CA2038063C Monitoring system for step-type switching transformer |
| 12/01/1999 | CN2351816Y Transformer for cold cathode long-tube fluorescent lamp |
| 11/25/1999 | WO1999060588A1 Selector switch |
| 11/25/1999 | WO1999060585A1 Variable inductor |
| 11/25/1999 | CA2329961A1 Variable inductor |
| 11/25/1999 | CA2311781A1 Selector switch |
| 11/24/1999 | CN2350850Y Carbon brush assembly with radiating fin |
| 11/24/1999 | CN2350849Y Full-sealed power transformer |
| 11/17/1999 | EP0956629A1 An a.c. current distribution system |
| 11/17/1999 | EP0956571A1 Transformer with voltage regulating means |
| 11/17/1999 | CN1046590C Switching arrangement for load change-over switches of step switches and for selector switches |
| 11/02/1999 | US5977761 Three-phase transformer with in phase regulating winding for the regulation of phase voltages |
| 10/27/1999 | EP0951723A1 A controllable inductor |
| 10/21/1999 | DE19836463C1 Electric stepping switch for stepping transformer |
| 10/20/1999 | EP0950277A1 Device and method relating to protection of an object against over-currents comprising over-current reduction |
| 10/20/1999 | EP0950276A1 Device and method relating to protection of an object against over-currents comprising over-current reduction and current limitation |
| 10/20/1999 | CN1232276A Vacuum valve type load time-division contact switching device |
| 10/14/1999 | DE19821775C1 Load selector for step transformer |
| 10/07/1999 | WO1999050884A1 Use of variable impedance having rotating core to control coil sputter distribution |
| 10/06/1999 | EP0749627B1 Switching arrangement for load change-over switches of step switches and for selector switches |
| 10/06/1999 | CN2342452Y Dry solid loaded tapping switch |
| 10/06/1999 | CN2342451Y Tapping switch without excitation |
| 09/21/1999 | CA2038717C End stop for stepper of step-type transformer |
| 09/14/1999 | CA2184731C An electrically controllable inductor |
| 09/02/1999 | WO1999028934A3 Flux control for high power static electromagnetic devices |
| 09/01/1999 | CN2336464Y Transformer tap changer fixed contact |
| 08/18/1999 | CN1226347A 电磁装置 Electromagnetic devices |
| 08/12/1999 | DE19805120A1 High voltage choke coil |
| 08/11/1999 | CN1225753A Rotating electrical machine plant |
| 08/11/1999 | CN1225743A 变压器/电抗器 Transformer / reactor |
| 08/10/1999 | US5936503 Controllable inductor |
| 08/04/1999 | CN2332046Y Disk-type no-excitation shunting switch |
| 08/04/1999 | CN2332045Y On-load shunting stepless regulator |
| 07/27/1999 | US5929737 Controllable inductor |
| 07/20/1999 | US5926083 Static magnet dynamo for generating electromotive force based on changing flux density of an open magnetic path |
| 07/14/1999 | CN1222695A Method of monitoring the functional capability of tap selector |
| 07/07/1999 | CN2328087Y Transmission of nonexciting changing switch |
| 06/30/1999 | CN2327058Y Magnetic-flux-adjustable transformer |
| 06/30/1999 | CN2327057Y Variable reactor |
| 06/24/1999 | WO1999031686A1 Flux-controlled variable tranformer |
| 06/24/1999 | WO1999031685A1 Linear variable reactor |
| 06/24/1999 | WO1999017315A3 A method and an arrangement for regulating a transformer/reactor, and a transformer/reactor |
| 06/24/1999 | WO1999017313A3 Magnetic tap changer |
| 06/23/1999 | CN1220542A Variable linearity coil |
| 06/17/1999 | WO1999017316A3 Induction controlled voltage regulator |
| 06/17/1999 | WO1999017314A3 A step-free induction controlled voltage regulator |
| 06/16/1999 | CN1220043A Electric high voltage AC machine |
| 06/16/1999 | CN1220026A DC transformer/reactor |
| 06/15/1999 | CA2191489C System for coupling external leads to a multitap transformer |
| 06/10/1999 | WO1999028934A2 Flux control for high power static electromagnetic devices |
| 06/10/1999 | WO1999028928A1 Transformer with regulating means |
| 06/10/1999 | CA2315621A1 Flux control for high power static electromagnetic devices |