| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 03/06/2008 | US20080055037 Inductance variable device |
| 02/28/2008 | WO2008024067A1 A resistor for electric high-voltage apparatus and a method of mounting a resistor |
| 02/28/2008 | WO2008024048A1 Electric motor drive unit for on-load tap-changers |
| 02/27/2008 | CN201029075Y Novel blade spring socket of on-load tap-changer movable contact head member |
| 02/21/2008 | WO2008020750A1 Controlled electric voltage transformer, method for adjusting the transformation ratio, and device for switching outlets |
| 02/21/2008 | US20080042768 Dual-mode voltage-controlled oscillator |
| 02/20/2008 | CN201025593Y Single phase no excitation voltage adjusting combined transformer |
| 02/20/2008 | CN201025592Y Loaded voltage adjusting combined transformer |
| 02/20/2008 | CN201025591Y Loop energy saving electric welder |
| 02/20/2008 | CN101127273A Mechanical limit device of tapping switch electric device |
| 02/13/2008 | CN201022048Y High-voltage self-excited magnetic saturation and soft start reactor |
| 02/06/2008 | EP1884965A1 Change action monitoring device for on-load tap changers |
| 02/06/2008 | CN201017758Y High-frequency high voltage booster transformer |
| 02/06/2008 | CN101118803A Distributing transformator electronic type loaded automatic wide region voltage regulating device |
| 02/06/2008 | CN101116788A On-load tap-changer on-line oil filtering integrated machine |
| 01/24/2008 | WO2008009349A2 Coil, control system, contacting system and method |
| 01/24/2008 | WO2008009195A1 Signal compensation method for passive signal isolators |
| 01/23/2008 | CN101111982A Saturation control of electric machine |
| 01/23/2008 | CN101110294A Load tap-changing dry-type transformer |
| 01/16/2008 | CN101107682A Change action monitoring device for on-load tap changers |
| 01/09/2008 | EP1559120B1 Transformer |
| 01/09/2008 | CN201004369Y Voltage adjusting transformer |
| 01/08/2008 | US7317374 Self-damped inductor |
| 01/02/2008 | CN201000834Y Tapping switch gear sensor |
| 01/02/2008 | CN101097805A Transformer having drag-head switch and transformation method of transformer drag-head |
| 01/01/2008 | US7315231 Electrical reactor assembly having center taps |
| 12/26/2007 | CN200997337Y Disk-type shift operating mechanism of stripped branching switch |
| 12/26/2007 | CN101093748A Contrable combination type reactor |
| 12/19/2007 | CN200993918Y Non-excited flie-flop voltage regulating tap switch |
| 12/19/2007 | CN101090034A Load capacity and pressure regulating switch for transformer |
| 12/18/2007 | US7310038 Electromechanical device for selecting coil voltage and locking the coil in place |
| 12/13/2007 | WO2007140675A1 Non-excited tap-changer with shielding device |
| 12/12/2007 | EP1864305A2 An on-load tap changer |
| 12/12/2007 | CN200990326Y Tap changer operating mechanism |
| 12/12/2007 | CN200990285Y Controllable reactor with compensating winding |
| 12/12/2007 | CN200990284Y External electric source controllable reactor |
| 12/12/2007 | CN100354993C Charge transfer apparatus and method therefor |
| 12/06/2007 | WO2007107872A3 Universal monitoring and diagnostic control system for a transformer or tap- changer |
| 12/06/2007 | US20070279035 Transformer for impedance-matching power output of RF amplifier to gas-laser discharge |
| 12/05/2007 | CN200987126Y Transformation switching circuit for power supply apparatus |
| 12/05/2007 | CN200986844Y Transformer energy-saving device dedicated for road lamp |
| 12/05/2007 | CN200986842Y Stereo winding dual-split transformer voltage-regulating coil |
| 11/29/2007 | WO2007135209A1 Optimized static tap changer for high-tension/medium-tension (ht/mt) and medium-tension/low-tension (mt/lt) transformers |
| 11/28/2007 | CN200983309Y Power transformer controlled by potential oil pump |
| 11/22/2007 | WO2005026860A3 Preventive maintenance tapping and duty cycle monitor for voltage regulator |
| 11/21/2007 | CN200979835Y An indicating mechanism of tapping position |
| 11/21/2007 | CN200979295Y Transformer magnaflux adjustable electric water heater |
| 11/15/2007 | DE102006022438A1 Choke coil for e.g. multiple mains filter drive system, has primary winding, where choke coil is coupled with coupling coil and choke coil inductivity is adjusted by coupling coil that is realized as air core coil, which does not have core |
| 11/14/2007 | CN200976305Y Combined on-load tap switch for transformer |
| 11/14/2007 | CN200976116Y Circuit apparatus for controlling voltage of lighting lamp |
| 11/13/2007 | US7295095 Electric component and method of producing the same |
| 11/08/2007 | DE102006033422B3 Vacuum switching tube for load diverter of on-load tap changer, has upper/lower resistance contact plungers axially movable and electrical conductively guided to other plungers, where contact plungers are operated by respective plungers |
| 11/07/2007 | EP1664960A4 Preventive maintenance tapping and duty cycle monitor for voltage regulator |
| 10/24/2007 | CN200965822Y An improved high current transformer |
| 10/24/2007 | CN101061557A Method and product for designing a transformer |
| 10/23/2007 | US7286036 Method for selecting coil voltage and locking the coil in place |
| 10/17/2007 | CN200962367Y An electrical welder |
| 10/10/2007 | CN200959280Y Improved circular voltage regulator |
| 10/10/2007 | CN200959270Y Loaded-switch binding fixer of oil-immersion transformer |
| 10/07/2007 | CA2584361A1 System and method of reinforcing diverter switches |
| 10/03/2007 | CN200956303Y Contactless stepless on-load voltage-regulating transformer |
| 10/03/2007 | CN100341240C Controllable inductance of AC field magnetic amplifier and its application |
| 10/02/2007 | CA2409377C Magnetic controlled current or voltage regulator and transformer |
| 09/27/2007 | WO2007107872A2 Universal monitoring and diagnostic control system for a transformer or tap- changer |
| 09/27/2007 | CA2645868A1 Universal monitoring and diagnostic control system for a transformer or tap-changer |
| 09/26/2007 | CN200953539Y Transformer solid loaded tap changer controller |
| 09/26/2007 | CN200953280Y Distributing loaded voltage regulating electric transformer |
| 09/26/2007 | CN200953279Y Transformer for dynamic analog testing |
| 09/26/2007 | CN200953275Y Voltage regulator for electric dust cleaning rectifier transformer |
| 09/26/2007 | CN101042958A Transformer and iron core set thereof |
| 09/25/2007 | US7274000 Power source for high current welding |
| 09/19/2007 | CN200950388Y Contact type A. C. regulator extending switch |
| 09/19/2007 | CN200950387Y On-load tap-changer with manual gear shift mechanism |
| 09/19/2007 | CN101039091A Method and apparatus for realizing load voltage regulation with a plurality of switching elements |
| 09/18/2007 | US7271692 Slider for selecting coil voltage and locking the coil in place |
| 09/13/2007 | WO2007101849A1 A hybrid on-load tap changer and a method of operating the same |
| 09/13/2007 | CA2645010A1 A hybrid on-load tap changer and a method of operating the same |
| 09/12/2007 | EP1192625B1 Charge transfer apparatus and method therefor |
| 09/12/2007 | CN200947411Y Manual shift mechanism for on-load tap switch |
| 09/12/2007 | CN200947379Y On-load regulating capacitor combined type transformer |
| 09/07/2007 | WO2007099928A1 Broadband oscillator |
| 09/06/2007 | DE102007004530A1 Connection switch for use in transformer, has main interrupter that is opened when auxiliary interrupters are closed and opened at side of respective conductive and non-conductive connections before transition operation |
| 09/05/2007 | EP1829187A1 Saturation control of electric machine |
| 09/05/2007 | EP1671338B1 Ignition coil for a spark ignition engine |
| 09/05/2007 | CN200944364Y Off-circuit cage tap-changer for transformer |
| 09/05/2007 | CN200944363Y Fixed plate type carrier-free voltage regulating switch |
| 09/05/2007 | CN200944345Y Off-circuit positive and negative regulating strip-type tapping switch |
| 09/05/2007 | CN200944344Y On-load regulating capacitor transformer |
| 09/05/2007 | CN200944343Y High-precision adjustable transformer |
| 08/29/2007 | EP1826785A1 Transformer and circuit comprising said transformer |
| 08/29/2007 | CN200941557Y Induction regulating automatic tunning arc depression voltage limitor |
| 08/29/2007 | CN200941333Y Electrical brush guiding gear of regulating transformer |
| 08/23/2007 | DE202006020014U1 Motorantrieb Motor drive |
| 08/22/2007 | CN2938366Y Switchover mechanism of on-load tap changer |
| 08/14/2007 | US7256678 Magnetically controlled inductive device |
| 08/08/2007 | CN2932587Y Level regulating device of medium and small-size transformer of resistance welding |
| 08/08/2007 | CN2932586Y An excitation-free autotransformer tap switch |
| 08/01/2007 | CN2929929Y Low voltage loaded regulating tap changer |
| 08/01/2007 | CN101009155A Tap switching device when loading |
| 07/25/2007 | CN2927284Y Adjusting transformer for smelting polycrystalline silicon |