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)
12/1990
12/04/1990CA1277369C Procedure and device to operate an hvdc transmission short coupling in the event of power system faults
11/1990
11/29/1990DE4021552A1 Safety switching of regenerative inverter feeding public network - involves periodic variation of load and energy balance with monostable circuit responsive to absence of pulse
11/28/1990CN1047422A Autosynchronous compensater for electric power system of oil field
11/27/1990US4974140 Voltage stability discrimination system for power systems
11/22/1990EP0398723A2 Switching power supply apparatus and isolating method thereof
11/22/1990EP0398550A2 Power status detecting apparatus
11/22/1990EP0398176A2 Harmonic reduction for multi bridge converters
11/22/1990EP0397932A1 Control device for active filter
11/20/1990US4971136 Dual fuel heat pump controller
11/08/1990DE3915213A1 Modification circuit for reactive power rated values - passes detected actual values of each line via inverting summation amplifier, low pass filter and second inverting summation amplifier
11/07/1990CN2065372U Capacitive phase-lack protector for three-phase motor
11/07/1990CN1010359B Gate signal generator for thyristor valve
10/1990
10/31/1990CN1046622A Apparatus for automazation of power circuit dispatch and controlling device of power load
10/30/1990US4967129 Power system stabilizer
10/24/1990CN1046421A Improvements in gate pulse generator for static var compensator
10/23/1990US4965694 Remote controlled circuit breaker system
10/23/1990US4965463 Flat frequency, constant voltage power source device
10/23/1990CA1275436C Induction generator/motor system
10/18/1990WO1990012440A1 System separation detector for power source of distributed type
10/18/1990WO1990012261A1 A system for supplying hot water
10/17/1990EP0392458A2 Improvements in gate pulse generator for static var compensator
10/10/1990EP0391617A1 Method and network for enhancing power factor of off-line switching circuit
10/10/1990CN2063714U Motor type circulating reactive compensator
10/10/1990CN2063713U Power load controller
10/09/1990US4962354 Superconductive voltage stabilizer
10/04/1990DE3910183A1 Textile machine, especially ring-spinning machine
10/03/1990EP0390459A2 Power controller for heater load
09/1990
09/26/1990EP0388479A1 Voltage-reactive power control apparatus
09/18/1990US4958055 Control circuit for a refrigerator combined with a microwave oven
09/04/1990CA1273700A1 Method for switching-error-protected actuation of the switching devices for carrying out the method
08/1990
08/29/1990EP0384435A2 Power signal processing system
08/29/1990CN2061343U Motionless reactive power automatic compensator
08/28/1990US4953052 Pole slip protection circuit for paralleled generators
08/23/1990WO1990009695A1 A device with a multi-phase load, a static converter and choke coils
08/23/1990CA2008726A1 Load totalizing blocked throwover control
08/21/1990US4950970 Induction motor control system
08/21/1990CA1273055A1 Superconductive energy storage circuit
08/09/1990WO1990009050A1 Power supply system
08/07/1990US4947310 Parallel operating system for alternate current output converters
07/1990
07/31/1990US4945304 Device for monitoring the unbalance of the electric power demanded
07/31/1990CA1272263A1 Energy management system
07/26/1990WO1990008417A1 No break power transfer control for a vscf power generating system
07/18/1990EP0378085A2 Exhaust gas turbine generator apparatus
07/17/1990US4942352 Non-contacting power supplying system
07/17/1990CA1271809A1 Control apparatus of ac/dc power converter
07/17/1990CA1271808A1 Power conversion system
07/12/1990WO1990007819A1 Paralleling method and control for a vscf system
07/11/1990CN2059284U Gr2 type high voltage parallel connection condencer cubicle
07/10/1990US4941079 Pulse width modulation power transmission system
07/04/1990CN1043592A Control apparatus of dc power coupling system
07/04/1990CN1043591A Reactive power compensation apparatus with improved gate circuit
06/1990
06/28/1990WO1990007224A1 Phase separation control
06/27/1990EP0374944A2 Information processing system, and metal production system and power distribution control system using the same
06/26/1990US4937769 Apparatus and method for reducing transient exponential noise in a sinusoidal signal
06/26/1990US4937507 Regenerative control system for motor generator
06/26/1990US4937463 Flat frequency, constant voltage power source device
06/26/1990US4937462 No break power transfer control for a VSCF power generating system
06/23/1990CA2006000A1 0nformation processing system, and metal production system and power distribution control system using the same
06/20/1990EP0373601A2 Reactive power compensation apparatus with improved gate circuit
06/19/1990US4935642 Circuit for distributing electrical power to several functional units
06/14/1990WO1990006618A1 Polyphase power converter with ripple filter choke
06/14/1990WO1990006613A1 Electric power system
06/14/1990WO1990006612A1 A method for supplying electricity
06/13/1990EP0372961A2 Add/shed load control using anticipatory processes
06/13/1990EP0372109A1 Reactive power controller
06/08/1990CA2004836A1 Add/shed load control using anticipatory processes
06/06/1990EP0371556A1 Circuit arrangement for powering a load
05/1990
05/30/1990CN1042630A Super-synchronous method of ac self-exciting type for generators and motors
05/29/1990US4930064 Phase stabilized high frequency link power converter apparatus having a wide phase controllable range
05/29/1990US4930061 Method and network for enhancing power factor of off-line switching circuit
05/23/1990CN1042456A Static type automatic compensation method of reactive power
05/17/1990WO1990005405A1 Filter for variable speed, constant frequency electrical system
05/17/1990WO1990005402A1 Electrical power generating system having parallel generator control
05/16/1990CN1008037B Inverse current transformer system common to a.c. and d.c inputs
05/15/1990US4926107 Variable inertia energy storage system
05/09/1990EP0367247A2 Control apparatus of DC power coupling system
05/09/1990CN1007948B Idle compensating control for electric power system
05/08/1990US4923153 Strip clamp
05/01/1990US4922364 Series capacitor equipment
05/01/1990US4922124 Power converter device
05/01/1990CA1268519A1 Power supply adapter systems
04/1990
04/26/1990DE3935564A1 Geraet zum parallelen betreiben von nichtunterbrechbaren dreiport-leistungsversorgungseinrichtungen Geraet for parallel run of three uninterruptible power port-care facilities
04/25/1990EP0364502A1 Electric energy supply
04/24/1990US4920303 Device for rotary-driving a centrifuge arm and method for power-feeding said device
04/11/1990CN2055997U Outside electricity generating equipment for energy saving of drilling machine
04/11/1990CN1007570B Dual tunning low energy consumption filtering device and method
04/11/1990CN1007507B New main junction of power system of electric railway
04/10/1990US4916377 Voltage-reactive power control apparatus
04/10/1990US4916328 Add/shed load control using anticipatory processes
04/09/1990EP0294394A4 Peak power shaving apparatus and method.
04/05/1990WO1990003680A1 Method and apparatus for controlling a power converter
04/04/1990EP0361292A1 Synchronous machine with a shunt excitation device
04/04/1990CN1041069A Basic circuit for adjusting the capacitance of a capacitor
04/03/1990US4914375 Saturable reactor apparatus for automatic control of power factor of inductive load
03/1990
03/27/1990US4912390 Apparatus for controlling firing of thyristors relative to a current reaching zero by using a microcomputer and hardware responsive to voltage crossing zero
03/21/1990EP0359178A2 Load control system
03/21/1990EP0359027A1 Stand-by set for a dynamic breakdown-free current supply
03/21/1990EP0358967A2 Circuit for precision controlling differential frequency
03/21/1990CN2054949U Automatic control for rationing feeding electricity when in high-peak consumption
03/21/1990CN1040716A Circuit and method for dc content protection of parallel vscf power systems
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