US5107410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-phase and shifted phase power distribution systems
Assignee: Group Dekko Inc
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Filing: 1991-06-28
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Granted: 1992-04-21
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Expires: 2011-06-28
Abstract
Abstract A method and apparatus for providing a source of alternating current electrical power to a plurality of loads in an office environment, including a plurality of non-linear loads which draw power for only a portion of the alternating current cycle, includes an input source of three-phase electrical power to a primary side of a power transforming device which provides an output at its secondary side which comprises at least six phases and a shared neutral. The plurality of loads are evenly distributed between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads. Each of the six phases is separated from the other by 120 electrical degrees, and the fourth, fifth and sixth phases are separated from the first, second and third phases, respectively, by 180 electrical degrees. In a preferred embodiment, two sets of six phases are provided, with each of the phases in the first set shifted, relative to respective phases of the second set, so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads. Benefits of the invention include lower ground to neutral noise, reduced transmission losses, more accurate power measurement by induction watt-hour meters, and fewer instances of neutral current overload.
Inventors
- 👤 John K. Marsh
- 👤 Russell E. Zemen, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:05
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/26; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/10; H02M5/14; Y; Y02; Y02E; Y02E40/00; Y02E40/50
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
134 words
A method of providing a source of alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the source for only a portion of the alternating current cycle, comprising the steps of: providing an input source of three-phase electrical power to a primary side of a power transforming device; transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least six phases and a shared neutral; and distributing the loads connected between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 2
Independent Claim
134 words
A method of providing a source of alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the source for only a portion of the alternating current cycle, comprising the steps of: providing an input source of three-phase electrical power to a primary side of a power transforming device; transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least six phases and a shared neutral; and distributing the loads connected between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 3
Dependent Claim
62 words
A method according to claim 1, wherein a first, second and third of said six phases are separated from each other by approximately 120 electrical degrees, and wherein a fourth, fifth and sixth of said phases are separated from each other by approximately 120 electrical degrees and are separated from the first, second and third phases, respectively, by approximately 180 electrical degrees.
Claim 4
Dependent Claim
16 words
A method according to claim 1, wherein said output power source comprises at least twelve phases.
Claim 5
Dependent Claim
23 words
A method according to claim 3, wherein each of said twelve phases is separated from the other phases by approximately 30 electrical degrees.
Claim 6
Dependent Claim
73 words
A method according to claim 1, wherein said transforming step includes providing at least two sets of six phases, and wherein each of the phases in a first of said two sets of six phases are shifted relative to respective phases of the second set, so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads.
Claim 7
Dependent Claim
33 words
A method according to claim 5, wherein said six phases in the first set are shifted by approximately 30 electrical degrees relative to respective ones of the six phases in the second set.
Claim 8
Dependent Claim
25 words
A method according to claim 5, wherein each of the two sets of six-phases is shifted in opposite directions relative to the input power source.
Claim 9
Dependent Claim
27 words
A method according to claim 7, wherein each of the two sets of six-phases is shifted by approximately 15 electrical degrees relative to the input power source.
Claim 10
Independent Claim
197 words
A method of providing a source of alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the source for only a portion of the alternating current cycle, comprising the steps of: providing an input source of three-phase electrical power to a primary side of a power transforming device; transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least two sets of six phases and a shared neutral, and wherein each of the phases in a first of said two sets of six phases are shifted, relative to respective phases of the second set of the six phases so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads; and balancing the distribution of loads connected between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 11
Independent Claim
197 words
A method of providing a source of alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the source for only a portion of the alternating current cycle, comprising the steps of: providing an input source of three-phase electrical power to a primary side of a power transforming device; transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least two sets of six phases and a shared neutral, and wherein each of the phases in a first of said two sets of six phases are shifted, relative to respective phases of the second set of the six phases so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads; and balancing the distribution of loads connected between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 12
Dependent Claim
141 words
A power distribution system for supplying alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the system for only a portion of the alternating current cycle, comprising: means for providing an input source of three-phase electrical power to a primary side of a power transforming device; and means for transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least six phases and a shared neutral; wherein the plurality of loads connected to the system are distributed between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 13
Dependent Claim
141 words
A power distribution system for supplying alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the system for only a portion of the alternating current cycle, comprising: means for providing an input source of three-phase electrical power to a primary side of a power transforming device; and means for transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least six phases and a shared neutral; wherein the plurality of loads connected to the system are distributed between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 14
Dependent Claim
64 words
A power distribution system according to claim 10, wherein a first, second and third of said six phases are separated from each other by approximately 120 electrical degrees, and wherein a fourth, fifth and sixth of said phases are separated from each other by approximately 120 electrical degrees and are separated from the first, second and third phases, respectively, by approximately 180 electrical degrees.
Claim 15
Dependent Claim
18 words
A power distribution system according to claim 10, wherein said output power source comprises at least twelve phases.
Claim 16
Dependent Claim
25 words
A power distribution system according to claim 12, wherein each of said twelve phases is separated from the other phases by approximately 30 electrical degrees.
Claim 17
Dependent Claim
77 words
A power distribution system according to claim 10, wherein said transforming means includes means for providing at least two sets of six phases, and wherein each of the phases in a first of said two sets of six phases are shifted, relative to respective phases of the second set, so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads.
Claim 18
Dependent Claim
35 words
A power distribution system according to claim 14, wherein said six phases in the first set are shifted by approximately 30 electrical degrees relative to respective ones of the six phases in the second set.
Claim 19
Dependent Claim
27 words
A power distribution system according to claim 14, wherein each of the two sets of six-phases is shifted in opposite directions relative to the input power source.
Claim 20
Dependent Claim
29 words
A power distribution system according to claim 16, wherein each of the two sets of six-phases is shifted by approximately 15 electrical degrees relative to the input power source.
Claim 21
Dependent Claim
38 words
A power distribution system according to claim 10, wherein said power transforming device comprises at least three primary windings, at least three main secondary windings associated, respectively, with the primary windings, and a plurality of smaller secondary windings.
Claim 22
Dependent Claim
40 words
A power distribution system according to claim 18, wherein selected ones of said smaller secondary windings are connected in series with selected ones of said main secondary windings to produce the at least six phases of the output power source.
Claim 23
Dependent Claim
199 words
A power distribution system for supplying alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the system for only a portion of the alternating current cycle, comprising: means for providing an input source of three-phase electrical power to a primary side of a power transforming device; and means for transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least two sets of six phases and a shared neutral, and wherein each of the phases in a first of said two sets of six phases are shifted, relative to respective phases of the second set of the six phases so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads; and wherein the plurality of loads are connected between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 24
Dependent Claim
199 words
A power distribution system for supplying alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the system for only a portion of the alternating current cycle, comprising: means for providing an input source of three-phase electrical power to a primary side of a power transforming device; and means for transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least two sets of six phases and a shared neutral, and wherein each of the phases in a first of said two sets of six phases are shifted, relative to respective phases of the second set of the six phases so as to reduce variations in the level of instantaneous power drawn from the input source which would otherwise occur due to the presence of the non-linear loads; and wherein the plurality of loads are connected between each phase of the output power source and the shared neutral so as to reduce by current cancellation the current which would otherwise flow in the shared neutral conductor due to the presence of the non-linear loads.
Claim 25
Dependent Claim
38 words
A power distribution system according to claim 20, wherein said power transforming device comprises at least three primary windings, at least three main secondary windings associated, respectively, with the primary windings, and a plurality of smaller secondary windings.
Claim 26
Dependent Claim
38 words
A power distribution system according to claim 21, wherein selected ones of said smaller secondary windings are connected in series with selected ones of said main secondary windings to produce the 12 phases of the output power source.
Claim 27
Independent Claim
122 words
A method of providing a source of alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the source for only a portion of the alternating current cycle, comprising the steps of: providing an input source of three-phase electrical power to a primary side of a power transforming device; transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least one phase; and shifting the output phase relative to the input phase so as to reduce the level of instantaneous current drawn from any one of the input phases due to the presence of the non-linear loads.
Claim 28
Independent Claim
122 words
A method of providing a source of alternating current electrical power to a plurality of loads, including a plurality of non-linear loads which draw power from the source for only a portion of the alternating current cycle, comprising the steps of: providing an input source of three-phase electrical power to a primary side of a power transforming device; transforming the input power source to provide an output power source at a secondary side of the power transforming device, said output power source comprising at least one phase; and shifting the output phase relative to the input phase so as to reduce the level of instantaneous current drawn from any one of the input phases due to the presence of the non-linear loads.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-21 | 1995-10-21 | 1996-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-21 | 1999-10-21 | 2000-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-21 | 2003-10-21 | 2004-04-21 | $7700.00 | Window Closed / Lapsed |