Inductor devices – Inductive regulators with no relatively moving parts – With magnetic shunt to increase leakage reactance
Patent
1999-03-11
2000-10-24
Gellner, Michael L.
Inductor devices
Inductive regulators with no relatively moving parts
With magnetic shunt to increase leakage reactance
336214, 336150, 336212, 336215, H01F 2108, H01F 2724
Patent
active
061373915
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to static voltage regulators for stabilizing voltage in an electric power system, which are non-tapping voltage-regulators for use in place of transformers having tappings switchable depending upon loads in distribution substations, voltage regulators with taps switchable when being loaded in power transmission systems and pole-mounted transformers for stabilizing secondary voltage.
BACKGROUND ART
Recent development of the national economy has been accompanied with the increasing demand for electric power and the diversity of loads to the electric power. In this connection, there is an increasing need for flexible electrical power utilities that are effectively adaptable to variations of supply voltage. Until now, voltage regulator-transformers provided with tap-changers shown in FIG. 18 has been usually used for stabilizing voltage in the electric power supply systems. The tap-changing type voltage-regulating transformer, however, has intrinsic limitations on its maintenance and service life because it includes a tap-contactor and tap-switching mechanism that cannot avoid mechanical faliure and abrasion of its moving parts causing wearing of parts, poor contact, time-lag of voltage and so on.
In other words, any conventional voltage-regulator-transformer incluing a tap-changer involves a maintenance problem of mechanical wearing of tap-contacts and a tap-switching mechanism and a performance problem of time-delay in voltage control due to slow action of the switching mechanism.
In view of the foregoing, the present invention was made to provide a flux-controlled variable transformer that can control the voltage at a high speed without using a voltage-adjusting tap-changer.
DISCLOSURE OF INVENTION
An object of the present invention is to provide a flux-controlled variable transformer having a continuously variable secondary-winding voltage, which comprises: a first magnetic circuit composed of a first U-cut core and a second U-cut core, both the cores contacting at their cut ends with each other in the state either of the cores having been turned by 90.degree. in twisting direction relative to the other; a second magnetic circuit; a primary winding wound in common around the first U-cut core of the first magnetic circuit and the second magnetic circuit; a secondary winding wound for the second magnetic circuit; and a control winding wound on the second U-cut core of the first magnetic circuit, wherein changing a value of exciting current in the control winding produces a change in magnetic resistance in the first magnetic circuit with the primary winding wound therearound to change the magnetic flux linking the primary and secondary windings, thus resulting in changing the secondary winding voltage in accordance with a change of the current in the control windinng.
Another object of the present invention is to provide a flux-controlled variable transformer having a continuously variable secondary winding voltage, which comprises: a first three-phase magnetic circuit composed of a first three-phase E-cut core and a second three-phase U-cut core, both the cores contacting at their cut ends with each other in the state either of the cores having been turned by 90.degree. in twisting direction relative to the other; a second three-phase magnetic circuit; a primary winding wound in common around the E-cut core of the first three-phase magnetic circuit and the second three-phase magnetic circuit; a secondary winding wound around the second three-phase magnetic circuit; and a control winding wound on the second U-cut core of the first three-phase magnetic core, wherein changing a value of exciting current in the control winding produces a change in magnetic resistance in the first thre-phase magnetic circuit with the primary winding wound therearound to change the magnetic flux linking the primary and secondary windings, thus resulting in changing the secondary winding voltage in accordance with a change of the current in the control windinng.
BRIEF DESCRIPTI
REFERENCES:
patent: 3582829 (1971-06-01), Wanlass
patent: 4393157 (1983-07-01), Roberge et al.
Maeda Mitsuru
Mitamura Koichi
Sakamoto Masaaki
Gellner Michael L.
Mai Anh
Tohoku Electric Power Company, Incorporated
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