| Patents for H02J 3 - Circuit arrangements for ac mains or ac distribution networks (38,663) |
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| 07/16/1991 | US5032738 Scheme for rapid adjustment of network impedance |
| 07/10/1991 | CN2080723U In-phase detector |
| 07/04/1991 | DE3942601A1 Checking admissibility of coupling 2 power sub-networks in parallel - constructing difference for each sub-network between measured and reference voltages |
| 07/03/1991 | EP0435460A2 Current sharing control for paralleled power converters |
| 07/03/1991 | CA2033459A1 Apparatus for controlling the reactive impedance of a transmission line |
| 07/02/1991 | US5029288 Method and apparatus for operating a variable speed power generation system |
| 06/26/1991 | EP0433965A1 Household appliance or the like |
| 06/26/1991 | CN2079832U Harmonic resistor for electric net |
| 06/26/1991 | CN1052585A Direct-arc electric furnace fed with controlled current and method to feed direct-arc furnace with controlled current |
| 06/25/1991 | CA1285319C State signal formation for indicating the transition into the bypass mode of operation in an apparatus for high-voltage d-c transmission |
| 06/19/1991 | EP0432570A2 Gas turbine control system having maximum instantaneous load pickup limiter |
| 06/19/1991 | EP0432269A1 System separation detector for power source of distributed type |
| 06/18/1991 | CA1285047C Apparatus for stabilizing turbine-generator shaft torsional oscillations |
| 06/18/1991 | CA1285021C Series capacitor equipment |
| 06/12/1991 | EP0431967A2 Device for suppressing voltage fluctuation and higher harmonics |
| 06/12/1991 | EP0431563A2 Air conditioning system having a control unit for fine adjustment of inverter input current |
| 06/12/1991 | EP0431486A1 Power failure in a card room |
| 06/12/1991 | EP0431014A1 Utility metering. |
| 06/12/1991 | CN1012868B State type automatic compensation method of reactive power |
| 06/12/1991 | CA2031894A1 Gas turbine control system having maximum instantaneous load pickup limiter |
| 06/08/1991 | WO1991009451A1 Filter arrangement |
| 06/08/1991 | CA2074260A1 Filter arrangement |
| 06/08/1991 | CA2031467A1 Method and apparatus for spanning power failures in textile machines, especially at carding arrangements |
| 06/05/1991 | EP0430671A2 Power sequencing |
| 05/29/1991 | CN1051829A Low-frequency rapid unloading device |
| 05/23/1991 | WO1991007809A1 Apparatus for a balanced three phase ac power supply in a computer having variable dc loads |
| 05/22/1991 | CN1051632A Microprocessor-based digital synchronizer system |
| 05/21/1991 | US5017799 Automatic power supply load shedding techniques |
| 05/16/1991 | WO1991006998A1 Circuit breaker warning relay and control accessory |
| 05/14/1991 | US5015826 Power adjustment device for electric power systems, in particular for electric power systems with electric ovens |
| 05/14/1991 | CA1284176C Method and arrangement for protecting turbine generators against subsynchronous resonances occuring in power transmission systems |
| 05/10/1991 | WO1991007808A1 An uninterrupted power supply system having improved power factor correction circuit |
| 05/10/1991 | CA2069896A1 Uninterrupted power supply system having improved power factor correction circuit |
| 04/23/1991 | US5010467 Control apparatus of DC power coupling system |
| 04/23/1991 | US5010287 Induction motor control system |
| 04/18/1991 | DE3934400A1 AC-DC-AC inverter operation for three=phase motor supply - involves two thyristor inverters switched from sinusoidal phase current mode to indirect mode at transitional speed |
| 04/17/1991 | EP0422135A1 No break power transfer control for a vscf power generating system |
| 04/17/1991 | CN1050800A Electric power system with line drop compensation |
| 04/17/1991 | CN1050797A Reactive power compensating system for both high and low voltages |
| 04/16/1991 | US5008560 Load totalizing blocked throwover control |
| 04/16/1991 | CA1283167C Reactive power compensation device |
| 04/16/1991 | CA1283165C Method for reducing dynamic overvoltages in an alternating-currentsystem |
| 04/11/1991 | DE3933525A1 Inverter-fed motor excitation with isolated stator windings - involves switching between direct and indirect operations at different phases of sinusoidal cycle for separate inverters |
| 04/11/1991 | DE3933524A1 Inverter-fed motor operation with isolated stator windings - allows direct inverter operation at low speeds with quadrature sinusoidal currents from independent-fired thyristor bridges |
| 04/11/1991 | DE3932559A1 RF noise mains filter unit for AC inverter system - has compact housing for RC elements with locators for connectors |
| 04/11/1991 | DE3927437A1 Polyphase AC network symmetrisation with undelayed load control - involves predictive power factor correction by adjustable inductance and capacitances at each onset of load current |
| 04/10/1991 | EP0421689A2 Electric power system with line drop compensation |
| 04/10/1991 | EP0421534A1 Circuit arrangement for power supply to a load |
| 04/04/1991 | WO1991004525A1 Portable crash-survivable kinetic energy storage machine |
| 04/04/1991 | DE3931800A1 Stabilising three=phase supply - using flywheel mass coupled to sync. machine connected to AC supply in parallel |
| 04/04/1991 | CA2024922A1 Electric power system with line drop compensation |
| 04/03/1991 | EP0419690A1 Method and device for supplying a three-phase network with neutral wires capable of carrying a current |
| 03/27/1991 | EP0419217A2 Thyristor converter system with higher harmonics suppression |
| 03/26/1991 | US5003454 Power supply with improved power factor correction |
| 03/26/1991 | US5003453 Apparatus for a balanced three phase AC power supply in a computer having variable DC loads |
| 03/22/1991 | WO1991004600A1 Dispersion-type simulation apparatus |
| 03/13/1991 | EP0416569A2 Method and apparatus for line power monitoring for uninterruptible power supplies |
| 03/13/1991 | EP0416050A1 A device with a multi-phase load, a static converter and choke coils. |
| 03/13/1991 | EP0282572A4 Responder unit for energy management system |
| 03/12/1991 | US4999565 Apparatus for controlling the reactive impedance of a transmission line |
| 03/12/1991 | US4999564 Power system stabilizer system having improved integrity checking scheme |
| 03/06/1991 | EP0415228A2 Connection control device for controlling the connection of small generator unit to electric power system |
| 03/06/1991 | EP0414662A1 Method and device for driving an asynchronous motor with speed control by means of a controlled inverter |
| 03/06/1991 | CN1049755A Connecting control device for controlling connection of small generator unit to electric power system |
| 03/05/1991 | US4998024 Energy controlling system for time shifting electric power use |
| 02/26/1991 | US4996637 Electrical converter utilizing switched uni-directional and bi-directional energy sources |
| 02/26/1991 | US4996519 Method and apparatus for monitoring an amplifier |
| 02/20/1991 | CN2071843U Energy-saving network automatic step-up transformer |
| 02/19/1991 | US4994981 Method and apparatus for controlling a power converter |
| 02/19/1991 | CA1280501C Multiple time delay power controller apparatus |
| 02/07/1991 | WO1991001582A1 Pole slip protection circuit for paralleled generators |
| 02/05/1991 | CA1279895C Protection system for thyristor-controlled reactors |
| 01/30/1991 | EP0410866A1 Multioutput power converter |
| 01/30/1991 | EP0410526A1 Generator for generating an electric voltage |
| 01/30/1991 | EP0410128A2 Superconductive voltage stabilizer |
| 01/23/1991 | EP0409226A2 Power supply control system |
| 01/23/1991 | CN1011373B Arangement for high frequency link power conversion |
| 01/17/1991 | DE3922359A1 Load-shedding circuit e.g. switching off storage heater - has cross-branch connecting control contact in parallel with PTC, and self-latching contact with NTC resistances |
| 01/16/1991 | EP0408472A1 Method and apparatus for controlling the power supply of charges adapted to reduce network voltage fluctuations |
| 01/16/1991 | CN2069622U Outdoor transformer distribution box with compensating device |
| 01/15/1991 | CA1279096C Dc power transmission system |
| 01/09/1991 | CN1048467A Star-delta connection converter for auto static reactive-power compensator |
| 01/09/1991 | CN1011174B Control apparatus of converter |
| 01/08/1991 | US4983856 Method and system for interconnecting in quadrature two synchronous or asynchronous three-phase networks |
| 01/02/1991 | EP0404926A1 Paralleling method and control for a vscf system |
| 01/02/1991 | EP0404779A1 Process for stabilizing an oscillatory electrical supply network. |
| 01/02/1991 | CN2068729U Timing and phasing power supply auto-controller of supply main |
| 12/27/1990 | EP0403595A1 Switched electrical power conversion and balancing |
| 12/26/1990 | CN1048128A Measuring circuit of system separation for disperse disposition type of power source |
| 12/25/1990 | US4980812 Uninterrupted power supply system having improved power factor correction circuit |
| 12/20/1990 | WO1990016104A1 A system for discharging electrical power from a high-voltage direct current line |
| 12/19/1990 | EP0402362A1 Electrical load shedding circuit |
| 12/19/1990 | CN2067874U Constant power type automatic speed and voltage stabilizer for hydroelectric station |
| 12/18/1990 | CA1278038C Power converter apparatus for a dc power transmission system or a frequency conversion system |
| 12/12/1990 | EP0401442A1 Apparatus for automatic control of power factor of inductive load |
| 12/12/1990 | EP0401339A1 Phase separation control |
| 12/12/1990 | CN1047776A Switch-mode power supply with burst mode standby operation |
| 12/12/1990 | CN1010822B Single chip microprocessor wattless power controller |
| 12/11/1990 | US4977515 Load management device and method of use |
| 12/04/1990 | US4975822 Harmonic reduction for multi-bridge converters |