| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 03/10/1998 | US5726615 Integrated-magnetic apparatus |
| 02/25/1998 | EP0825712A2 Electronically tuned matching networks using adjustable inductance elements and resonant tank circuits |
| 02/18/1998 | CN1173723A High-tension transformation equipment |
| 02/17/1998 | US5719544 Transformer with controlled interwinding coupling and controlled leakage inducances and circuit using such transformer |
| 01/22/1998 | WO1997045933A3 A method and a device for reducing third harmonic phenomena in a rotating electric alternating current machine |
| 01/22/1998 | WO1997045926A3 An electric high voltage ac machine |
| 01/22/1998 | WO1997045921A3 Electromagnetic device |
| 01/21/1998 | CN2273072Y Electro-control earthing arc extinguishing arrangement |
| 01/15/1998 | WO1997045907A3 Rotating electrical machine plants |
| 01/14/1998 | CN2272609Y Large capacity contact type variable thansformer |
| 01/14/1998 | CN1037040C Single pole sub-connecting switch with linear contact |
| 01/07/1998 | CN1169615A In-line buck/boost voltage regulating systems and apparatus |
| 01/07/1998 | CN1036958C Load selector used in stepping switch of adjustable transformer |
| 01/02/1998 | DE19727449A1 In-line compensation/amplification voltage regulation device for load electrical power supply |
| 12/24/1997 | CN1036811C Load Selector used for switch of adjustable transformer |
| 12/04/1997 | WO1997045933A2 A method and a device for reducing third harmonic phenomena in a rotating electric alternating current machine |
| 12/04/1997 | WO1997045926A2 An electric high voltage ac machine |
| 12/04/1997 | WO1997045921A2 Electromagnetic device |
| 12/04/1997 | WO1997045907A2 Rotating electrical machine plants |
| 12/04/1997 | WO1997045848A1 A dc transformer/reactor |
| 12/04/1997 | WO1997045847A1 Transformer/reactor |
| 12/04/1997 | CA2256535A1 Rotating electrical machine plants |
| 12/04/1997 | CA2256469A1 Transformer/reactor |
| 12/04/1997 | CA2256347A1 Electromagnetic device |
| 12/04/1997 | CA2255742A1 A dc transformer/reactor |
| 12/04/1997 | CA2255739A1 An electric high voltage ac machine |
| 12/03/1997 | CN2269631Y 35(60)KV/10KV no-load capacity regulating power transformer |
| 12/02/1997 | US5694034 Tap changer for a tapped or stepped transformer |
| 11/27/1997 | WO1997044796A1 A controllable inductor |
| 11/27/1997 | WO1997044795A1 A controllable inductor |
| 11/27/1997 | CA2255551A1 A controllable inductor |
| 11/27/1997 | CA2255550A1 A controllable inductor |
| 11/26/1997 | CN2268980Y Combined active distribution switch for power transformer |
| 11/19/1997 | EP0807311A1 Device for voltage control |
| 11/19/1997 | CN2268299Y Dry box-shape vacuum loaded tap-off switching device |
| 11/05/1997 | EP0805464A2 Tap changer |
| 11/04/1997 | US5684678 Resonant converter with controlled inductor |
| 10/22/1997 | CN2265579Y Load tapped switch for transformer |
| 09/30/1997 | US5672963 Variable induction control led transformer |
| 09/25/1997 | WO1997035327A1 Electrical apparatus having electrical conductors mounted in electrical insulation |
| 09/24/1997 | CN2263390Y Voltage stablilzing transformer |
| 09/18/1997 | WO1997034161A1 Method for monitoring of tap changers by acoustic analysis |
| 09/17/1997 | CN2262739Y Stepless adjustable voltage transformer |
| 09/17/1997 | CN2262738Y Central section voltage-regulating dry-type vacuum on-load tap switchgear |
| 08/27/1997 | CN2261071Y Bridge vacuum loaded tap-off switch |
| 08/27/1997 | CN2261070Y Structure-improved single-phase voltage regulator |
| 08/26/1997 | US5660749 Transformer and A.C. arc welder |
| 08/20/1997 | CN2260376Y Arrangement for variating voltage of transformer without interrupting the load current |
| 08/14/1997 | WO1997029494A1 A parallel winding voltage-regulating apparatus |
| 08/13/1997 | CN2259676Y Non-excitation bar-type tapping switch |
| 08/07/1997 | WO1997028545A1 Passive non-linear inductor |
| 08/06/1997 | CN1035582C Iron lose resistant-changing method and device |
| 08/05/1997 | US5654627 Method of automatically changing upper, balanced and lower voltage in electric power saving transformer and the device of the same |
| 07/30/1997 | CN2258652Y Composite type vacuum load tapped switch |
| 07/30/1997 | CN2258650Y Stepless changeable electric reactor |
| 07/30/1997 | CN1155967A Electrical power control system |
| 07/23/1997 | CN2258310Y Multi-tap load adjustable blowout coil |
| 07/16/1997 | CN2257956Y 35KV 3-compounding air loading tap changer |
| 07/08/1997 | US5646836 Switch mode power supply using a saturable inductor to provide a pulsed current source |
| 07/02/1997 | CN2257396Y Short-circuit type adjustable inducer |
| 06/26/1997 | DE19549237A1 Indexing switch for load switching transformers |
| 06/18/1997 | CN2256580Y Double pole double electric brush synchronous slide-wire voltage regulator |
| 06/11/1997 | EP0778659A2 Resonant converter with controlled inductor |
| 06/11/1997 | CN2256151Y Iron core structure of arc welding transformer |
| 06/11/1997 | CN2256150Y Votage regulator |
| 06/05/1997 | WO1997020328A1 Controlled by-pass reactor |
| 05/22/1997 | DE19543226A1 Inverter current source |
| 05/14/1997 | EP0649564B1 On-load tap changer |
| 05/07/1997 | EP0771518A1 Electrical power control system |
| 05/07/1997 | CN1149352A Electric adjuster |
| 04/30/1997 | CN1148747A Method and circuit for disconnecting transformer in depdendence on whether load connected thereto requires power, or not |
| 04/23/1997 | CN2253042Y Vacuum loaded shunting switch |
| 04/16/1997 | CN1147726A Regulating method for stepping switch |
| 04/08/1997 | US5619176 System for coupling external leads to a multitap transformer |
| 04/02/1997 | EP0375687B2 Thyristor on-load change-over switch |
| 03/19/1997 | EP0763835A2 Tap selector |
| 03/19/1997 | EP0763834A2 Tap changer |
| 03/19/1997 | CN2249959Y Non-excitation magnet drum-shape switch |
| 03/19/1997 | CN2249958Y Loadless electric controlling voltage regulation switch |
| 03/12/1997 | EP0762446A1 Electric adjuster |
| 03/12/1997 | CN2249443Y Loaded tapping switch |
| 03/12/1997 | CN1144925A Load tip-off exchanger type ac. constant voltage device |
| 03/05/1997 | CN2248913Y Power transformer for automatically rearranging voltage or phase with improved structure |
| 02/26/1997 | EP0759587A1 Method for regulating a step switch |
| 02/26/1997 | CN2248389Y Commutation switch for transformer |
| 02/26/1997 | CN2248378Y Electric driver without field tapping switch |
| 02/19/1997 | CN1143426A Switching arrangement for load change-over switches of step switches and for selector switches |
| 02/18/1997 | US5604424 Electrical changeover switching |
| 02/12/1997 | EP0758153A2 Circuit device for disconnecting a transformer not under load |
| 02/08/1997 | CA2182730A1 Method and circuit for disconnecting a transformer in dependence on whether a load connected thereto requires power, or not |
| 02/05/1997 | CN2246843Y Connecting device between tapping switch and transformer winding |
| 01/22/1997 | EP0711450B1 Planar transducer |
| 01/16/1997 | WO1997001883A1 Resonance tapped transformer |
| 01/01/1997 | CN2244245Y Large current loaded tapped switch |
| 12/27/1996 | EP0749627A1 Switching arrangement for load change-over switches of step switches and for selector switches |
| 12/18/1996 | EP0748471A1 An electrically controllable inductor |
| 12/17/1996 | US5585766 Plasma processing system for use in fabricating electronic devices |
| 12/12/1996 | DE19628819A1 Transformer with variable turns ratio esp. for use as mains transformer with variable secondary voltage |
| 12/12/1996 | DE19528827C1 Control of transformer tap or stepping switches e.g. for power supply installation |
| 12/04/1996 | CN1137157A Phase-shifting transformer and protection system of phase-shifting transformer |