| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 12/24/2008 | CN201170984Y Tri-phase reactance on-load tap-changer |
| 12/24/2008 | CN201170278Y Combined type leaf spring |
| 12/18/2008 | US20080309429 Monolithic integrated inductor |
| 12/17/2008 | CN201167032Y Movable contact for a tap changer |
| 12/17/2008 | CN201167023Y Position indication mechanism for a transformer tap changer |
| 12/17/2008 | CN201167022Y Unloading type structure for cage body lath of an excition-free tap switch |
| 12/17/2008 | CN201167021Y External hanging combined on-load tap-changer |
| 12/17/2008 | CN201167020Y Apparatus for indicating a mechanical position in a dry-type on-load tap changer |
| 12/17/2008 | CN201167019Y Straight-loading type bar connecting block and slide tap changer using the same |
| 12/17/2008 | CN101325124A Tapping switch for load voltage-regulating transformer and voltage-regulating transformer using the same |
| 12/17/2008 | CN101325123A Method for making high-power switch power supply plane magnetic element |
| 12/10/2008 | CN201163570Y Changeable excitation-free tap switch |
| 12/10/2008 | CN201163569Y Rotating angle transducer installation apparatus of transformer on-load tap-changer |
| 12/10/2008 | CN201163568Y Non-excitation bar-type tapping switch |
| 12/10/2008 | CN201163567Y Special tool for examination and repair of on-load tapped switch of transformer |
| 12/10/2008 | CN101320650A Vacuum bubble system integral cell structure of vacuum on-load tapping switch |
| 12/10/2008 | CN100442410C Off-circuit tap-changer with shielding device |
| 12/03/2008 | EP1996990A2 Control system for a transformer or reactor |
| 12/03/2008 | CN201160030Y Indistinct speed regulator of three-phase AC motor |
| 11/26/2008 | CN201156467Y Tunable reactor |
| 11/20/2008 | WO2008138623A1 Method for influencing the magnetic coupling between two bodies at a distance from each other and device for performing the method |
| 11/20/2008 | CA2688134A1 Method for influencing the magnetic coupling between two bodies which are at a distance from one another, as well as an apparatus for carrying out the method |
| 11/19/2008 | EP1991919A1 A hybrid on-load tap changer and a method of operating the same |
| 11/19/2008 | CN101309011A Magnet controlled voltage regulating imaginary power automatic compensation method and device |
| 11/13/2008 | DE10331866B4 Einrichtung zur Steuerung einer Spulenanordnung mit elektrisch variierbarer Induktivität, sowie Schaltnetzteil Means for controlling a coil arrangement with electrically diversifiable inductance and switching power supply |
| 11/11/2008 | US7449851 Arrangement for automatically influencing a mains supply and motor drive therefor |
| 11/05/2008 | CN101299382A Directly-mounting type bar shape wiring block and slide tapping switch using the same |
| 10/21/2008 | CA2244765C Piezoelectric transformer |
| 10/15/2008 | CN101286722A Step control device and control method for antiskid crosspiece of loaded pressure regulating switch of transformer |
| 10/08/2008 | CN201130595Y Non-excitation bar-type tapping switch |
| 10/02/2008 | DE102007023124B3 Schaltanordnung Switching arrangement |
| 10/01/2008 | CN201126762Y Control device for bar-shaped non-excitation tapping switch |
| 10/01/2008 | CN201126756Y Non-excitation bar-shaped tapping switch |
| 10/01/2008 | CN101278249A Method and device for controlling of a magnetic flux |
| 09/24/2008 | CN201122519Y Switch contact curve integrated movable contact spring mechanism with gradient of tapping switch |
| 09/24/2008 | CN201122501Y Four-core control casing tube magnetic controlled continuously adjustable reactor |
| 09/24/2008 | CN201122500Y Carbon brush assembly |
| 09/24/2008 | CN201122499Y Capacity-adjustable dry-type transformer |
| 09/17/2008 | CN201117416Y Bell-shaped structure transformer on-load tap-changer dismounting sling |
| 09/17/2008 | CN201117415Y Self-coupled regulating transformer winding construction |
| 09/17/2008 | CN201117414Y Self-coupled regulating transformer |
| 09/16/2008 | US7425884 Electrical device and method of producing the same |
| 09/10/2008 | CN201112105Y Shoulder frame structure tapping switch for transformer |
| 09/03/2008 | CN101256879A Electric impedance variable reactor |
| 08/27/2008 | EP1962301A1 Element for adjustment network, adjustment network and application of the same |
| 08/27/2008 | CN201107798Y Driver for electric motor with load tap changer |
| 08/21/2008 | WO2008100127A1 Transformer for controlled electric voltage and method for adjusting electric voltage |
| 08/21/2008 | WO2008100126A1 Transformer for current of controlled residual flux |
| 08/14/2008 | DE102007005852A1 Wind park, has accumulative network, turbine transformers and wind energy plants, where group of wind energy plants has separate swiveling transformer that produces swiveling phase to another group of wind energy plants |
| 08/13/2008 | CN101242159A Systems and methods for power amplifiers with voltage boosting multi-primary transformers |
| 08/13/2008 | CN101241798A Process leakage-adjustable inductance transformer |
| 07/30/2008 | CN100407346C 组合式机械端位限位机构 Combined mechanical end position stop mechanism |
| 07/24/2008 | US20080174394 Symmetrical differential inductor |
| 07/23/2008 | EP1946198A2 A method and device for controlling of a magnetic flux |
| 07/16/2008 | CN100403463C Method of increasing electric appliance power factor |
| 07/09/2008 | EP1941592A1 Fault current limiters (fcl) with the cores saturated by superconducting coils |
| 07/02/2008 | CN100398244C Power source for high current welding, and buried arc welding method |
| 06/26/2008 | US20080150664 Power source for plasma device |
| 06/25/2008 | CN100397277C Device with controllable impedance |
| 06/19/2008 | WO2008073034A1 An induction regulator and use of such regulator |
| 06/11/2008 | CN201072698Y Integrated designing medium and high frequency transformer |
| 06/11/2008 | CN201072690Y On-load tap-changer on-line oil filtering integrated machine |
| 06/11/2008 | CN101197207A Non-combustible on-load tap-switch |
| 06/11/2008 | CN101196752A Voltage stabilizer |
| 06/05/2008 | US20080129434 Variable inductor |
| 06/04/2008 | CN201069699Y Slippery-prevention step control device for load voltage-adjusting switch of the transformer |
| 06/03/2008 | US7382598 Means for controlling a coil arrangement with electrically variable inductance |
| 05/29/2008 | WO2007073316A9 A method and device for controlling of a magnetic flux |
| 05/28/2008 | CN201066625Y Tap switch for non excitation magnetic plate |
| 05/28/2008 | CN100390552C Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
| 05/21/2008 | CN201063313Y Pressing device for vacuum bubble control cam disk mechanism of vacuum on-load tap-changer |
| 05/21/2008 | CN201063307Y Eccentric wheel structure for releasing gear of on-load tap-changer firearms bolt |
| 05/21/2008 | CN201063287Y Circular cylinder structural dry type vacuum loaded switch |
| 05/21/2008 | CN201063286Y Hoist linkage with on-load tap-changer |
| 05/21/2008 | CN201063285Y Vacuum integral cage type insertion structure with on-load tap-changer |
| 05/21/2008 | CN101183604A Inductor core structures |
| 05/20/2008 | CA2462551C Electrical reactor assembly having center taps |
| 05/14/2008 | CN201060748Y Mechanical position limiter for tapping switch electrically operated mechanism |
| 04/30/2008 | DE102006050624A1 Reactance connecting device for transformer in electric arc furnace, has induction coil and standalone load switch for adjusting reactance of induction coil under load, where induction coil is provided with multiple tapping points |
| 04/30/2008 | CN201054296Y Transformer magnetic core and its induction leakage adjustable transformer |
| 04/30/2008 | CN101170007A Method for adjusting mutual induction effect |
| 04/24/2008 | US20080094160 Generalized cancellation of inductor winding capacitance |
| 04/24/2008 | DE102006061601A1 Transition contacts burn up determining method for electrical on-load tap changer of step transformer, involves computing actual burn-up of transition contacts depending on current flowing over transition contacts |
| 04/23/2008 | CN201051444Y A self feed controllable reactor |
| 04/22/2008 | US7362204 Inductance with a midpoint |
| 04/22/2008 | US7362203 Multi-tap microelectromechanical inductor |
| 04/16/2008 | CN201048079Y Non-field excitation neutral point pressure regulation bar-shaped tapping switch |
| 04/16/2008 | CN201048078Y Non-field excitation linear pressure regulation bar-shaped tapping switch |
| 04/02/2008 | CN201044202Y Load-ratio voltage transformer with bias winding |
| 04/02/2008 | CN101154528A Manufacturing process for manual shifting mechanism with on-load tap-changer |
| 04/02/2008 | CN101154498A Device and method for controlling changing operation of on-load tap changer |
| 04/02/2008 | CN101154497A Cam rail made of novel material |
| 04/02/2008 | CN101154496A Manufacturing process for on-load tap-changer with manual shifting mechanism |
| 03/20/2008 | WO2008031302A1 Non-excited tap-changer with shielding device |
| 03/19/2008 | EP1358500B1 Tap changer condition diagnosing |
| 03/19/2008 | CN201038032Y Guiding positioning double guide rod sliding box loaded tap-changer quick gunlock release device |
| 03/13/2008 | WO2008009349A3 Coil, control system, contacting system and method |
| 03/12/2008 | CN201036146Y Single-phase traction transformer of secondary side center tap |
| 03/12/2008 | CN201036144Y Auxiliary transformer of permanent-magnet motor dedicated for pumping unit |
| 03/12/2008 | CN201036143Y Great current bearable and continuously adjustable microinductor unit |