Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Reexamination Certificate
2001-01-19
2001-11-20
Han, Jessica (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
C323S264000
Reexamination Certificate
active
06320360
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
This invention relates to a voltage control system for dispensing optimal quantities of electrical energy from a central source to individual users.
SUMMARY OF THE INVENTION
It is an object of the invention to use energy produced by any electric generator or by public utilities or private distribution networks and to dispense it in the desired optimal quantity to the ultimate user's plant.
In a first embodiment of the invention, the voltage is controlled by varying the distance between two moving coils of a variable transformer. This is accomplished via an actuating device positioned at the head of the core. In addition, the core is also moved between the coils to vary the amount of the core that is present between the two coils. The variation of reciprocal position between two or more coils can be carried out continuously through pulses generated by a minicomputer with a suitable control card.
In a second embodiment, the primary winding of the transformer is stationary and the secondary winding is moving. The distance between the two coils is varied by linked magnetic flux taking place by separating the second winding from the primary and inserting one or more moving cores between the columns of the transformer, activated by a suitable device.
In a third embodiment, both coils of the transformer are stationary and the variation of linked magnetic flux takes place by inserting one or more moving cores between the columns of the transformer through a suitable mechanical device.
In all three embodiments, providing for different methods of control of movement and positions of the components, a variation of linked magnetic flux of the transformer is obtained and, therefore, control of the electromotive force supplied to the load.
The invention consists of continuously regulating and stabilizing the combined load feed, for control of the power factor on input and output, which favors a reduction of the reactive component of the electric power and reduces the costs of operation of the ultimate users' plants. The voltage reducing equipment can be used for high power values, without using power contacts or other electromechanical systems, which are used in other systems for varying voltage.
This system does not produce interruptions of electric power, since it provides solely for continuous variations of the functional parameters and does not produce micro interruptions of voltage, which in the case of lighting equipment, is often the cause of sudden failures of lamps.
The system controls the variation of self-induced electromotive force in a variable transformer in a system of moving and/or stationary coils inserted in a moving or stationary core having a rectangular cross-section(s) or other variable shape(s), through a microprocessor and appropriate control cards. The system allows for a reduction or increase of electromotive force accompanied by a continuous automatic correction with sensors and/or readers of the quantity of power through discontinuous variation of the absorbed current of capacitors placed in parallel with the load, in single phase or in three phases simultaneously.
There is an automatic correction of movement due to electrodynamic repulsion or attraction exerted by the coils with each other, and stabilization of voltage values on the output to the load through control of the distance between coils.
The section of the moving core and of the air gap can be varied through the mechanical insertion of magnetic lamination columns with their grains or laminations oriented or not, for control of the useful section of the magnetic core, involved in coupling between the coils and the cores themselves.
The insertion of moving cores takes place between the columns of the transformer and between the coils (primary and secondary winding for single phase) in both directions. The voltage can be increased over network values through a different turn ratio between the coils, with automatic control of output voltage, depending on the values programmed. The power can be automatically corrected with values pre-established by the user for a single phase. The system offers different structural configurations of the variable transformer and, therefore, the design choice is a direct consequence of the specific use application.
The design choice makes possible the use of three different systems for energy control:
(a) stationary coils, and a variable section of moving core that is horizontally inserted between the coils with a mechanical actuator;
(b) a stationary primary winding and a movable secondary winding, with a variable section of core that is inserted between the columns with a mechanical actuator; or
(c) movable primary and secondary windings with a movable core inserted between the coils.
REFERENCES:
patent: 4540931 (1985-09-01), Hahn
patent: 4904921 (1990-02-01), DeVito et al.
patent: 5327030 (1994-07-01), DeVito et al.
Collard & Roe P.C.
Han Jessica
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