Patents
Sitemap › H02 - Generation, conversion, or distribution of electric power › H02J - Circuit arrangements or systems for supplying or distributing electric power; Systems for storing electric energy › H02J 3 - Circuit arrangements for ac mains or ac distribution networks
Patents for H02J 3 - Circuit arrangements for ac mains or ac distribution networks (38,663)
03/1990
03/20/1990US4908956 For applying AC line power for drying
03/15/1990DE3829671A1 Regulation of converter-powered synchronous machines
03/14/1990EP0357829A1 Non-contacting power supplying system
03/14/1990CN2054585U Dynamic power-factor compensation device
03/13/1990US4908565 Power generating system
03/08/1990WO1990002379A1 Utility metering
03/07/1990EP0357392A2 Circuit and method for DC content protection of parallel VSCF power systems
03/07/1990EP0357285A2 Power supply for outdoor lighting systems
03/07/1990CN2054225U Semi-automatic parallel network apparatus in power plant at quasi-synchronism
03/07/1990CN1040290A Computerized monitor system for electric power substation
03/06/1990US4906901 Power supply for outdoor lighting systems using high frequency
03/06/1990US4906860 Control device for active filter
03/06/1990CA1266507A1 Variable-speed generator/motor system
03/06/1990CA1266466A1 Process for the preparation of 10-substituted steroids
02/1990
02/28/1990CN2053812U Mechano-electric unitized power supply unit for electric drilling machine
02/27/1990US4905134 Paralleling method and control for a VSCF system
02/27/1990US4905117 Circuit and method for DC content protection of parallel VSCF power systems
02/21/1990CN2053416U Energy-saving controller for resistance-type heater
02/20/1990US4903184 Reactive power controller
02/20/1990US4902965 Consumption meter for accumulating digital power consumption signals via telephone lines without disturbing the consumer
02/14/1990EP0354841A1 Appliance for monitoring the electric power disequilibrium in electric network lines or in an internal triphase installation
02/14/1990CN2052977U Computer controlled power factor compensater
02/08/1990WO1990001230A1 Switched electrical power conversion and balancing
01/1990
01/30/1990US4897593 Reactive power compensator for electric power system
01/16/1990US4894764 Modular AC output battery load levelling system
01/16/1990US4894763 AC-AC converter using switches in a DC link
01/09/1990US4893069 Ferroresonant three-phase constant AC voltage transformer arrangement with compensation for unbalanced loads
01/04/1990DE3821856A1 Electronic circuit for the parallel AC network operation of renewable energy
01/03/1990EP0348938A1 Current producing plant supplying mains and consumer
01/02/1990US4891570 Static var compensator with thyristor control
01/02/1990US4891569 For use with an alternating current power distribution system
12/1989
12/19/1989US4888674 Method and apparatus for decoupling the active and reactive power control for a high voltage DC transmission line coupling two networks
12/19/1989US4888495 Power adapter for electrical installations and especially domestic installations with so-called carrier current control
12/14/1989WO1989012342A1 Process and system for reducing power peaks of supply and/or consumption of power transmitted through lines
12/12/1989US4887200 Method and apparatus for determining the actual value of the margin-angle in the valves of an inverter
12/12/1989US4887014 Industrial robot control device
12/12/1989US4886981 Synchronizing circuit for a plurality of power units
12/07/1989DE3818732A1 Method and device for compensating for reactive currents
12/06/1989CN2049035U 无功功率自动补偿屏 Reactive power automatic compensation screen
12/06/1989CN2049034U Reactive power controller for monolithic microcomputer
12/06/1989CN2048976U Fixed double-functional electric-energy auto-calculator
12/05/1989US4885492 Rotary power module construction
11/1989
11/29/1989EP0343383A2 Power adjustment device for electric power systems, in particular for electric power systems with electric ovens
11/22/1989CN2048248U Low voltage distributor for subscriber's line
11/21/1989US4882501 Power supply arrangement for electro-hydraulic control systems in mining and civil engineering
11/16/1989DE3915024A1 Informationen speichernde vorrichtung und verfahren zum systematischen entwurf einer derartigen vorrichtung Information storing apparatus and method for systematic design of such a device
11/15/1989CN2047854U Static reactive power continuous compensation device for low-voltage network
11/08/1989EP0340913A2 Dual generator electrical apparatus
11/08/1989EP0340292A1 Power supply system for segmented loads
11/07/1989US4879477 Procedure and circuit arrangement for switching on an inductance subject to remanence
10/1989
10/31/1989US4878208 Voltage-phase responsive, inverter disable circuit for system interconnection
10/24/1989US4876622 Circuit breaker warning relay and control accessory
10/18/1989EP0337863A1 Rotation drive device for a centrifugal arm and power supply method for such a device
10/18/1989CN2046220U Self-check three-phase voltage regulating device
10/17/1989US4875149 Phase separation control
10/17/1989US4874961 Electrical power generating system having parallel generator control
10/17/1989US4874926 Electric heating load management control
10/10/1989US4873619 Method and apparatus for controlling a static converter at an asymetrical network
10/10/1989CA1262257A1 Method and system for operating power converter system
10/03/1989US4871961 Method of controlling the supply of power to electrical loads with a minimum of switching surges
09/1989
09/26/1989US4870310 Portable crash-survivable kinetic energy storage machine
09/26/1989CA1261455A1 Remote control circuit breaker
09/26/1989CA1261388A1 Power transmission system with current limiting device
09/26/1989CA1260533A1 Control for bumpless transfer of an ac motor between solid state inverter and a supply means
09/26/1989CA1260524A1 Twin winding three-phase alternator with zero slot coupling
09/21/1989WO1989008939A1 Process for stabilizing an oscillatory electrical supply network
09/21/1989WO1989008881A1 Electric energy supply
09/19/1989US4868412 Distributed control system
09/19/1989US4868410 System of load flow calculation for electric power system
09/13/1989CN2044391U Multi-way electric sum batcher
09/13/1989CN2044387U Current limiter
09/08/1989WO1989008342A1 Electrical load shedding circuit
09/06/1989EP0330755A2 Active filter device
09/06/1989EP0284604B1 Synchronizing circuit for a plurality of power units
09/05/1989US4864484 High-pass element of a filter assembly for a line connected with static converters
08/1989
08/30/1989EP0330477A2 Induction motor control system
08/29/1989US4862341 Filter for variable speed, constant frequency electrical system
08/29/1989US4862340 DC power transmission system
08/23/1989EP0329258A1 Apparatus for coupling an induction generator to ac power lines
08/22/1989US4859884 Gate signal generator for thyristor valve
08/15/1989US4857821 Reactive power compensation system
08/09/1989CN2042641U Reactive power automatic compensator
08/09/1989CN2042640U Automatic power limiting thow-back device
08/08/1989US4855922 Apparatus and method for monitoring an energy management system
08/08/1989US4855890 Power factor correction circuit
08/08/1989US4855653 Obstruction detection in automatic portal control apparatus employing induction motor power factor
08/03/1989DE3802677A1 Method for improving the operating behaviour of dynamic power-factor correction installations having a limited power control capability
08/01/1989CA1258098A1 Apparatus for data transmission from multiple sources on a single channel
08/01/1989CA1258094C Apparatus for measuring the potential of a transmission line conductor
07/1989
07/27/1989WO1989006879A1 Active filter arrangement for filtering harmonic current components generated by a nonlinear consumer connected to a power system
07/26/1989CN2041865U Automatic control switch for electric power
07/19/1989EP0157860B1 Controllable risk parameter for device control system
07/18/1989US4849950 Device for reducing the leakage noise of a power converter
07/11/1989US4847782 Energy management system with responder unit having an override
07/11/1989US4847781 Energy management system
07/11/1989CA1257327A1 Apparatus for operating cycloconverters in parallel fashion
07/05/1989EP0323173A2 Power converter device
07/05/1989EP0323169A2 A power distribution system for a phased array radar
07/05/1989CN1033718A Idle compensating control for electric power system
07/05/1989CN1033717A Single phase conveying circuit with electricity saving
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