Resources Contact Us Home
Ferroresonant three-phase constant AC voltage transformer arrangement with compensation for unbalanced loads

Image Number 7 for United States Patent #4893069.

A ferroresonant three-phase constant AC voltage transformer comprising three transformer iron cores with one for each corresponding input supply phase, primary windings and secondary windings formed on each of the transformer iron cores, series reactance components or reactors connected in series, with the primary windings, automatic voltage regulating means for controlling secondary output voltages generated at the secondary windings to a predetermined target value, compensating windings formed so as to be inductively coupled to each of the series reactance components or reactors, and means for connecting the compensating windings in series with each other to form a closed loop circuit. The secondary output voltages are theoretically kept in balanced condition even when the loads or the primary input voltages or both are unbalanced.

  Recently Added Patents
Method for forming ventilation holes in an electrode plate
Circuit board having semiconductor chip embedded therein
Signal generator
Systems and methods for processing telephone calls
Methods and apparatus for clock signal synchronization in a configuration of series connected semiconductor devices
Stowable pet leash and collar
  Randomly Featured Patents
Decorative casket cover system
Sizing composition for glass strands, process using this composition and resulting products
Semiconductor integrated circuit
Increasing viscosity of carrageenan-containing compositions with microwave radiation
Method and apparatus for managing metadata associated with entities in a computing system
Device and method of obtaining a sample of liquid
Quick connect/disconnect apparatus for removably securing armrests to vehicle seating assemblies
Method for dithering image data
Adductor contraction exercise apparatus and method
Semiconductor memory device and method of producing the same