Method and apparatus for providing selectable output voltages

a technology of output voltage and selectable voltage, which is applied in the direction of variable transformer, variable inductance, inductance, etc., can solve the problems of longer delivery time and more expensiv

Inactive Publication Date: 2010-10-12
HOWARD INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]It is another object of the present invention to provide a method and apparatus that will provide a wide range of output voltages in multiple tap power transformers where the highest voltage output is greater than twice the lowest voltage output and the winding loss factor is low.

Problems solved by technology

Bridging tap changers with a greater number of positions are usually made to order and therefore are more expensive and have longer delivery times.
Among the design factors to be considered are cost and ready availability of material or parts, such as switches.

Method used

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  • Method and apparatus for providing selectable output voltages
  • Method and apparatus for providing selectable output voltages
  • Method and apparatus for providing selectable output voltages

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first embodiment

[0031]In the present invention, shown in FIG. 4 of the drawings, the schematically illustrated transformer 10 has a primary winding 11, two isolated center tapped secondary windings 12 and 13 and two additional isolated secondary windings 14 and 15. Electrical access leads 16 through 24 provide electrical contact to the winding ends and taps as shown. The turns ratios of the secondary windings are 6:6:1:1 for windings 12, 13, 14, and 15, respectively.

[0032]Leads 16 through 21 are interconnected through a pair of ganged five-position bridging tap changers 25 and 26 and wired as a three-position series-parallel-series switch. Leads 21 through 24 are interconnected through a three-position bridging tap changer 27. Both three-position and five-position bridging tap changers are relatively inexpensive, off-the-shelf switches.

[0033]According to the invention, the system of FIG. 4 provides a selection of any of nine distinct voltage outputs at transformer secondary output terminals 28 and ...

sixth embodiment

[0040]In the present invention shown in FIG. 9, the secondary windings 52″ and 53″ are, as in the previous two embodiments, tapped at thirds as are secondary windings 54″ and 55″. The turns ratio relationship between the four secondary windings of the system of FIG. 8 is such that windings 54″ and 55″ each comprise a three unit turns group and windings 52″ and 53″ each comprise a twenty-one unit turns group.

[0041]With the leads of windings 52″ and 53″ connected by series-parallel-series switch, ganged switches 68″ and 69″, as in the previous embodiments, and the leads of windings 54″ and 55″ are interconnected through a seven-position bridging switch 70″, as shown, the system of FIG. 9 provides twenty-eight different voltage outputs available in one voltage unit steps from twenty-one to forty-eight voltage units. The highest to lowest winding loss ratio of the system of FIG. 9 is 1.286. The highest to lowest loss ratios of FIG. 1 and FIG. 2 adapted to this voltage range are 1.495 an...

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Abstract

A transformer is provided along with a combination of bridging tap-changers to provide a wide range of selectable output voltages in discrete, relatively small voltage steps where the highest voltage is more than double the lowest output voltage. Relatively inexpensive, off-the-shelf, bridging tap-changers are utilized in conjunction with transformer winding schemes to provide a low winding loss ratio.

Description

[0001]The present invention claims the benefit of the filing date of provisional application, U.S. Serial No. 60 / 175,647, filed on Jan. 12, 2000.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to electrical power distribution equipment and more particularly to electrical transformers and switching means therefor.[0004]2. Description of the Prior Art[0005]In some electrical power distribution systems it is desirable to provide a plurality of selectable, often incrementally different, voltage outputs from system transformers. A range of such selectable voltage outputs from a single transformer may be achieved through the use of transformers having a number of isolated multiple tap primary and / or secondary windings interconnected to appropriate switching mechanisms. Commonly used in such applications are bridging tap changers and series-parallel-series (S-P-S) switches.[0006]Bridging tap changers may take the form of several stationary elec...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01F21/12H01F29/02H01F29/04H01F38/24
CPCH01F29/04
Inventor OWEN, DONALD W.
Owner HOWARD INDS
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