| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 12/12/2001 | CN2465289Y Excitation free disk shape tapping switch |
| 12/12/2001 | CN1326309A Lateral magnetic inducing heater with varying width of magnetic path |
| 12/06/2001 | US20010048356 Method and apparatus for providing selectable output voltages |
| 11/29/2001 | WO2001090835A1 Magnetic controlled current or voltage regulator and transformer |
| 11/28/2001 | CN2462522Y Loaded voltage and capacity regulatable transformer for oil field |
| 11/28/2001 | CN1324082A Connection mode between on-load voltage regulating switch and secondary side of power transformer |
| 11/20/2001 | US6320360 Energy dimmer drive and energy pilot |
| 11/15/2001 | WO2001086669A1 Energy dimmer drive and energy pilot |
| 11/15/2001 | US20010040444 Energy dimmer drive and energy pilot |
| 11/13/2001 | US6317021 Variable inductor |
| 11/07/2001 | CN2458708Y Water-proof cap for transformer switch |
| 11/07/2001 | CN2458707Y Voltage power general inductive apparatus |
| 10/31/2001 | CN1074201C In-line buck/boost voltage regulating systems and apparatus |
| 10/25/2001 | US20010032685 Magnetic core for saturable reactor, magnetic amplifier type multi-output switching regulator and computer having magnetic amplifier type multi-output switching regulator |
| 10/24/2001 | EP1148762A1 Induction heating device having transverse flux and variable width inductor |
| 10/17/2001 | CN2454879Y Two-switch load-ratio voltage specific transformer |
| 10/17/2001 | CN2454878Y Excition-free tap switch |
| 10/11/2001 | WO2001075914A1 High voltage induction device |
| 10/11/2001 | WO2001075913A2 A variable induction device |
| 10/03/2001 | CN1316173A Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| 09/26/2001 | CN1314685A Tap convertor with load |
| 09/26/2001 | CN1314684A Tap converter |
| 09/12/2001 | EP1131829A1 A switchable flux control for high power static electromagnetic devices |
| 09/05/2001 | CN2446643Y Single coherence type vacuum loaded tap changer |
| 08/22/2001 | CN2444301Y Adjustable magnetic core reactor |
| 08/16/2001 | US20010013819 Output choke for D.C. welder and method of using same |
| 08/14/2001 | CA2076195C Actuator for a step-transformer load switch |
| 08/09/2001 | US20010011938 Output choke for D.C. welder and method of using same |
| 08/07/2001 | US6270592 Magnetic core for saturable reactor, magnetic amplifier type multi-output switching regulator and computer having magnetic amplifier type multi-output switching regulator |
| 07/19/2001 | WO2001052281A1 Variable power transformer of any voltage supply steady current intensity and absolute accuracy |
| 07/03/2001 | US6254738 Use of variable impedance having rotating core to control coil sputter distribution |
| 06/27/2001 | CN2437029Y Switching switch for dry type loaded distributing switch |
| 06/27/2001 | CN2437028Y Redistributing loaded switch for winding of transformer |
| 06/27/2001 | CN1301390A Variable inductor |
| 06/26/2001 | CA2202238C Alternating current power control device |
| 06/13/2001 | EP1106036A1 Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| 06/13/2001 | EP1105896A1 Step switch with selector |
| 06/13/2001 | CN2434776Y Double-induction contact voltage regulator |
| 06/06/2001 | CN2433720Y No-field positive-and-negative voltage regulating tap charger |
| 06/06/2001 | CN1298190A Contravariant transformer and discharge lamp firing circuit using the same contravariant transformer |
| 05/15/2001 | US6232865 Core for a controllable inductor and a method for producing therof |
| 05/09/2001 | CN1065676C Method and circuit for disconnecting transformer in dependence on whether load connected thereto requires power, or not |
| 05/01/2001 | US6226163 Device and method relating to protection of an object against over-currents comprising over-current reduction |
| 04/25/2001 | CN2427874Y Three phase box like transformer |
| 04/04/2001 | CN2426197Y Double-switlch rough and fineadjusted load voltage regulator |
| 03/29/2001 | WO2001022447A1 An electric switching device, a method for controlling the device and a use of the switching device |
| 03/29/2001 | WO2001022445A1 Isolation transformer arrangement |
| 03/14/2001 | EP1082735A1 Variable inductor |
| 02/28/2001 | EP1078380A1 Selector switch |
| 02/28/2001 | CN2421719Y Synchronous transmission pull-rod type through-dead center releasing mechanism with transmission for load tap changer |
| 02/27/2001 | US6194684 Output choke for D.C. welder and method of using same |
| 02/07/2001 | EP1075002A2 Variable inductance coil device |
| 01/31/2001 | CN2417546Y Zero excitation tap changer |
| 01/24/2001 | CN2416584Y 可控电抗器 Controllable Reactor |
| 01/24/2001 | CN2416583Y Controllable reactor |
| 01/24/2001 | CN2416582Y High-voltage controllable reactor |
| 01/18/2001 | WO2001004720A1 Transformer with secondary voltage electronic adjustment |
| 01/17/2001 | EP1068631A1 Use of variable impedance having rotating core to control coil sputter distribution |
| 01/10/2001 | CN1279816A Flux control for high power static electromagnetic device |
| 01/10/2001 | CN1279814A Electromagnetic device |
| 01/10/2001 | CN1279488A Capacity-adjustable transformer |
| 01/03/2001 | CN2413350Y No-excitation tapping switch |
| 12/27/2000 | CN1059991C Resonance tapped transformer |
| 12/21/2000 | WO2000078100A1 Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| 12/07/2000 | WO2000074094A1 Electric switching device |
| 12/05/2000 | US6157196 Method for monitoring of tap changers by acoustic analysis |
| 11/30/2000 | WO2000072341A1 Contact assembly on a preselector |
| 11/30/2000 | WO2000072337A1 A variable transformer |
| 11/30/2000 | WO2000072336A1 Transformer/reactor |
| 11/29/2000 | CN1275241A Selector switch |
| 11/29/2000 | CN1275240A Step switch with selector |
| 11/28/2000 | US6154019 Controllable inductor |
| 11/15/2000 | EP1051716A2 Magnetic tap changer |
| 11/01/2000 | CN1272217A Induction controlled voltage regulator |
| 11/01/2000 | CN1272216A Method and arrangement for regulating transformer/reactor, and transformer/reactor |
| 11/01/2000 | CN1272215A Magnetic tap changer |
| 10/31/2000 | US6140588 Arrangement at a conductor on high voltage potential |
| 10/25/2000 | CN1271170A Switch for converter of tapping on load |
| 10/24/2000 | US6137391 Flux-controlled type variable transformer |
| 10/12/2000 | DE19923722C1 Contact device for stepping switch pre-selector has contact ring within pre-selector insulating housing cooperating with contact secured in bore in housing wall via positioning washer mounted on contact shaft |
| 10/04/2000 | CN2399815Y Adjustable transformer structure |
| 09/20/2000 | CN2397581Y Flux-regulating transformer |
| 09/13/2000 | EP1034548A2 Flux control for high power static electromagnetic devices |
| 09/13/2000 | EP1034546A1 Electromagnetic device |
| 09/05/2000 | US6114934 Variable linearity coil |
| 08/30/2000 | EP1032003A2 Arrangement for sealing a cylindrical oil vessel for a switch |
| 08/29/2000 | CA2191480C Electric adjuster |
| 08/16/2000 | EP1027711A2 A method and an arrangement for regulating a transformer/reactor, and a transformer/reactor |
| 08/16/2000 | CN1055562C Electric adjuster |
| 08/10/2000 | DE19847519C1 Kontakt Contact |
| 08/09/2000 | CN1262517A Voltage regulator of magnetic circuit |
| 08/08/2000 | US6100674 Method of monitoring a tap changer |
| 07/19/2000 | EP1020879A1 Configurable transformer |
| 07/19/2000 | EP1019923A2 Induction controlled voltage regulator |
| 07/18/2000 | US6091032 Tap changer |
| 07/12/2000 | CA2296133A1 Configurable transformer |
| 07/11/2000 | US6087738 Variable output three-phase transformer |
| 07/05/2000 | EP1016101A1 Winding in transformer or inductor |
| 06/21/2000 | CN2384262Y Intelligent controller for load voltage-regulating switch of transformer |
| 06/14/2000 | EP1008220A1 Device and method relating to protection of an object against over-currents comprising over-current reduction and current limitation |