| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 07/08/2009 | CN101477886A Non-exciting shunting switch with annular dynamic contact |
| 07/08/2009 | CN101477885A Non-exciting shunting switch convenient for shifting |
| 07/08/2009 | CN101477884A Non-exciting shunting switch for positive and negative voltage regulating |
| 07/02/2009 | DE102007029905B4 Verfahren zum Betreiben eines elektrischen Transformators A method of operating an electrical transformer |
| 07/01/2009 | CN101471172A High-impedance rectifier transformer for electric precipitation |
| 06/24/2009 | CN201262888Y Fixed structure for barrel-type non-excitation switch stationary contact |
| 06/24/2009 | CN201262887Y Switching slay of on-load tap-changer |
| 06/24/2009 | CN201262886Y Tri-loop loaded voltage regulating transformer |
| 06/24/2009 | CN101465199A Variable capacitance and energy-saving transformer |
| 06/17/2009 | CN201259827Y Thyristor reactor transition loaded adapter switch without quick mechanism |
| 06/17/2009 | CN201259826Y Thyristor direct switching on-load tapping changing switch |
| 06/17/2009 | CN201259825Y Thyristor resistor transition switching on-load tapping changing switch |
| 06/17/2009 | CN201259824Y Chip shaped metal adjustable inductor |
| 06/16/2009 | US7548148 Integral transformer junction module |
| 06/11/2009 | WO2009073875A1 Load tap changer |
| 06/10/2009 | DE202008017356U1 Ölgefüllter Leistungstransformator mit Stufenschalter The oil-filled power transformer with tap changer |
| 06/10/2009 | CN201256071Y Micro iron core reactor |
| 06/10/2009 | CN101452759A Multi-stage pressure regulating conversion tap switch |
| 06/10/2009 | CN101452758A Tap switch fixed contact array of unequal turn positive and negative pressure regulating manner |
| 06/03/2009 | CN201251998Y Transformer for polysilicon reducing furnace |
| 05/28/2009 | WO2009065219A1 Electrical generator |
| 05/27/2009 | CN201247684Y Transformer with adjustable inductance quantity |
| 05/27/2009 | CN201247683Y Controller for loading capacitance-regulating distribution transformer |
| 05/27/2009 | CN101441931A Dry transformer with adjustable capacity |
| 05/20/2009 | CN201242932Y On-load capacitance-regulating synthesis controller capable of monitoring power distribution |
| 05/20/2009 | CN201242931Y Drive mechanism for internal groove wheel of tap changer selector |
| 05/20/2009 | CN201242930Y Nose shape gear drive mechanism of on-load tap-changer |
| 05/20/2009 | CN101436462A Wire splice structure of transformer with peripheral voltage regulation change |
| 05/13/2009 | CN201237968Y Coil structure of dry-type transformer |
| 05/13/2009 | CN101430967A Thyristor resistor transition switching on-load tap-changer |
| 05/13/2009 | CN101430966A Thyristor direct switching on-load tap-changer |
| 05/13/2009 | CN100487834C Transformer |
| 05/07/2009 | WO2009056018A1 An apparatus and method for starting and stopping an ac induction motor |
| 05/06/2009 | EP2054898A1 A resistor for electric high-voltage apparatus and a method of mounting a resistor |
| 05/06/2009 | CN201234072Y Inspection rack for loaded voltage regulating switch core |
| 05/06/2009 | CN101425358A Lightning current waveform forming inductor |
| 04/30/2009 | DE112007001415T5 Spannungsfreier Stufenschalter für einen Transformator in Käfigbauart Tension-free tap-changer for a transformer in cage type |
| 04/29/2009 | CN201230213Y Magnet controlled voltage regulating reactive automatic compensation device |
| 04/29/2009 | CN201229845Y Resistance changing voltage regulating soft starter for high voltage motor |
| 04/29/2009 | CN201229844Y Multi-staged loaded voltage regulating transformer |
| 04/29/2009 | CN101419861A Large capacity single body phase angle regulator |
| 04/29/2009 | CN100483575C Non-contact controllable reactor |
| 04/29/2009 | CN100482314C On-load tap-changer on-line oil filtering integrated machine |
| 04/16/2009 | DE10311071B4 Magnetanordnung Magnet assembly |
| 04/15/2009 | EP2047488A2 Coil, control system, contacting system and method |
| 04/15/2009 | CN201222624Y Maintenance bracket for loaded pressure-regulating switch rapid mechanism |
| 04/15/2009 | CN201222418Y Sectional type adjustable reactor |
| 04/15/2009 | CN101409148A Internal groove wheel drive mechanism and application thereof in on-load tap-changer |
| 04/08/2009 | CN201219062Y High-voltage tapping board connection device of mining flame-proof dry-type transformer |
| 04/08/2009 | CN201219061Y Electricity saving device |
| 04/08/2009 | CN201219060Y Multi-tap dry-type voltage-regulating transformer |
| 04/08/2009 | CN101405669A Universal monitoring and diagnostic control system for a transformer or tap-changer |
| 04/08/2009 | CN101404202A Low-pressure side on-load tap changer |
| 04/02/2009 | DE112007001277T5 Spannungsfreier Stufenschalter mit Abschirmeinrichtung Tension-free position switch with shielding |
| 04/01/2009 | CN201215761Y Frame type dry hollow controllable reactor |
| 04/01/2009 | CN101399112A Fixed contact tap switch with rotating bearing structure |
| 03/25/2009 | CN201213092Y Combined bar shaped non-exciting shunting switch |
| 03/25/2009 | CN101395555A A hybrid on-load tap changer and a method of operating the same |
| 03/25/2009 | CN101391333A Copper nose and copper wire welding device |
| 03/18/2009 | CN201210441Y Energy-saving type tunable parallel compensation reactor |
| 03/18/2009 | CN101388282A Frame type dry hollow controllable reactor |
| 03/18/2009 | CN101388281A Static inductor with switch for converter of tapping on load |
| 03/18/2009 | CN101388280A Multi-stage dry voltage regulating transformer |
| 03/17/2009 | US7504806 Apparatus and methods for controlling operation of a single-phase voltage regulator in a three-phase power system |
| 03/11/2009 | CN201207327Y Electric voltage booster |
| 03/11/2009 | CN101383233A Moving contact for tap switch |
| 03/11/2009 | CN101383223A Switch core of on-load tap-changer |
| 03/11/2009 | CN101383222A Externally hanging combined loaded tap-changer |
| 03/11/2009 | CN101383221A Three phase reactor on-load tap-changer |
| 03/11/2009 | CN101383220A Dry magnet controlled reactor |
| 03/11/2009 | CN100468905C Condition diagnosing |
| 03/05/2009 | US20090063063 Preventive Maintenance Tapping and Duty Cycle Monitor for Voltage Regulator |
| 03/03/2009 | US7498922 Self-damped inductor |
| 02/28/2009 | CA2639182A1 Method and apparatus for mounting a circuit board to a transformer |
| 02/25/2009 | EP1649475B1 Method for monitoring insulating oil |
| 02/11/2009 | CN101364472A Protection of permanent magnents in a dc-inductor |
| 01/28/2009 | EP2019397A2 Electric transformer |
| 01/28/2009 | CN201188543Y Automatic tracking tuning filter |
| 01/28/2009 | CN201188351Y Inner coupling gear for fixed contacts of excition-free tap switch |
| 01/28/2009 | CN101354957A Large-capacity double-body pressure-regulating phase-shifting transformator |
| 01/28/2009 | CN101354956A Large-capacity double-body phase-shifting transformator |
| 01/28/2009 | CN101354954A Load-ratio voltage transformer with angle-connecting high-voltage coil using reactance type on-load tap-changer |
| 01/27/2009 | US7482714 Preventive maintenance tapping and duty cycle monitor for voltage regulator |
| 01/22/2009 | DE102008032375A1 An einem Stufenschalter angebrachte stationäre Induktionsvorrichtung At one stage switch mounted stationary induction apparatus |
| 01/21/2009 | CN201185348Y 磁性滤波器 Magnetic filter |
| 01/21/2009 | CN201185148Y Tapping-off contact device for excition-free tap switch |
| 01/21/2009 | CN201185126Y Industrial frequency resonance reactor |
| 01/15/2009 | WO2009008765A1 Short-circuit limiting device |
| 01/14/2009 | CN201181640Y Tapping switch movable contact component with guiding structure |
| 01/14/2009 | CN201181639Y Direct action type switch |
| 01/14/2009 | CN201181638Y Connecting structure for tapping switch center shaft and moving contact stand |
| 01/14/2009 | CN201180753Y Flat spring with claw shaped end |
| 01/14/2009 | CN101345124A Oil-immersed power transformer |
| 01/14/2009 | CN101345123A Inductor-adjustable apparatus |
| 01/02/2009 | DE102007029905A1 Elektrischer Transformator The electrical transformer |
| 12/31/2008 | CN201174679Y Energy saving controller for loaded pressure regulating switch |
| 12/31/2008 | CN201174312Y High leakage resisting type stepped adjustable series iron core reactor |
| 12/31/2008 | CN201174311Y Equipotential umbrella teeth intermediate gear mechanism of tap switch moving contact |
| 12/31/2008 | CN201174310Y Mechanical transmission construction of tap selector of on-load tap switch |
| 12/24/2008 | CN201170985Y Combination switch for on-load capacity-regulating distributing transformer and distributing transformer thereof |