WO2023077247A1 - Dispositivo de retorno de corrientes residuales homopolares que circulan por el neutro de un sistema de distribución electrico - Google Patents
Dispositivo de retorno de corrientes residuales homopolares que circulan por el neutro de un sistema de distribución electrico Download PDFInfo
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- WO2023077247A1 WO2023077247A1 PCT/CL2022/050110 CL2022050110W WO2023077247A1 WO 2023077247 A1 WO2023077247 A1 WO 2023077247A1 CL 2022050110 W CL2022050110 W CL 2022050110W WO 2023077247 A1 WO2023077247 A1 WO 2023077247A1
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 56
- 230000004907 flux Effects 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 8
- 239000013598 vector Substances 0.000 claims description 22
- 230000002051 biphasic effect Effects 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000003381 stabilizer Substances 0.000 abstract description 39
- 238000010586 diagram Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 101100096650 Mus musculus Srms gene Proteins 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000018199 S phase Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/02—Auto-transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/20—Contact mechanisms of dynamic converters
- H02M1/26—Contact mechanisms of dynamic converters incorporating cam-operated contacts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Definitions
- This disclosure refers to the contamination of harmonics in low voltage electrical networks and in particular to passive stabilizers of residual currents that circulate through the neutral in a polyphase electrical distribution system.
- the electrical distribution systems are used to supply residential consumption and most of the industrial ones, using voltages of less than 1 [kV] between phases (commonly levels of 1 10 and 220 [V] single-phase for residential consumption and 500 to 600[V] between phases for industrial consumption).
- the transformer physically joins the lines (phases) through a return point called "Neutral", in order to circulate through said transformer the current difference that is produced from the vectorial sum of they.
- This residual current will enter the core of the transformer through the neutral connection point and will compensate the magnetic flux of the "N" phases that the transformer has, achieving, on the high voltage side, keeping the phases of the system balanced.
- Three-phase systems constitute a particular case of "polyphase systems".
- the power supply is provided by a set of “n” sinusoidal voltage sources, all with the same amplitude value, all with the same frequency, but each with a different angular phase value.
- Said alternating current systems power electronic devices that we use in our homes and offices (such as televisions, computers, printers, microwave ovens, LED luminaires, video game consoles, cell phone chargers, etc.) which are known as non-volatile loads. linear.
- This type of loads works with direct current, and for that they need converter sources from alternating current (AC) to direct current (DC), which essentially, but not limited to, consist of full-wave rectifier diode bridges, feeding a capacitor in parallel with the load.
- AC alternating current
- DC direct current
- This type of distortion is repeated periodically throughout the time the electronic device is used, and its distortion is repetitive and continuous over time. This anomaly is known as harmonic distortion, and its name comes from the mathematical operation used to analyze this phenomenon.
- the mathematical analysis known as Fourier Analysis, consists of decomposing the distorted signal into multiple sinusoidal signals of various frequencies, which in turn are multiples of the fundamental signal. These sinusoidal signals are called “harmonics”, and in practice they are transformed into residual currents that circulate through the neutral, overloading the distribution systems and making the use of distributed energy more inefficient.
- a passive stabilizer that manages to attract these residual currents before they reach the transformer and distort the voltage signals and affect the efficiency of this transformer, which It is capable of avoiding failures when generating current "returns" between single-phase loads and their windings.
- FIG. 1 Power flow, 4-wire distribution network.
- FIG. 2 Example of distorted current with harmonic of order 3.
- FIG. 3 Example of harmonic current of order 3 for phases R, S and T balanced.
- FIG. 4 Plan of distribution network with the invention in P1.
- FIG. 5 Flow of homopolar harmonic currents in the device of the invention.
- FIG. 6 Electromagnetic circuit of the invention for three-phase distribution systems.
- FIG. 8 Connection diagram and direction of flow of the invention.
- FIG. 9 Vector connection diagram Stabilizer of the invention.
- FIG. 10 Electromagnetic flow of the Stabilizer of the invention.
- FIG. 11 Voltage phasor diagram Stabilizer of the invention.
- FIG. 12 Phase angles in the voltage phasor diagram in the stabilizer of the invention.
- FIG. 13 Obtuse triangle geometry.
- FIG. 14 Voltage drop in coils of the stabilizer of the invention.
- FIG. 16 Stabilizing phasor diagram of the invention in a biphasic system.
- FIG. 17 Diagram of the wound core of the stabilizer of the invention.
- FIG. 18 Electromagnetic flow of the stabilizer of the invention.
- FIG. 19 Prior art kernel and phasor diagram US 6043569 A.
- FIG. 20 Prior art kernel and phasor diagram CL 2007001057 A1.
- FIG. 21 Prior art kernel and phasor diagram ES 2575589 A1.
- Fig. 1 we have a distribution substation, hereinafter "SED", 102, which is responsible for delivering the electrical energy demanded by customers who are connected through the 3 phases R, S and T 104 and the neutral 108 of the feeder to said substation.
- SED distribution substation
- the loads (receivers) 106 that demand both triphasic and single-phase energy consumption are generally unbalanced by the dynamic consumption of the city (due to turning on and off electronic equipment, lighting, elevators, etc.). Consequently, a residual current is obtained that flows from the loads 106 through the neutral wire 108 to the SED 102.
- IRN is the current from phase R to neutral that circulates through the load ZRN.
- ISN is the current from phase S to neutral that flows through the load ZSN and ISN is the current from phase T to neutral that flows through the load ZTN.
- item 200 shows a simple decomposition of a current signal, where the fundamental current 202, a third harmonic current 204 is added, resulting in a distorted current 206.
- N-Arm 6N - 3 (Eq.6. Harmonic content)
- N°Arm Number of harmonic order and N: Number of cycles (discrete period).
- Fig.3 will clarify this particular phenomenon of homopolar harmonic currents, since it shows the current that circulates through each R-S-T phase and its third harmonic.
- phase R 302 we have current 306, which is affected by the third harmonic 304, the same case is repeated for phases S 308, their respective current 312, 120° out of phase with current R 306, and their current of third harmonic 310, along with phase T 314, its respective current 318, 240° out of phase with current R 306, and its third harmonic current 316.
- the homopolar harmonics are in phase, so they add in the neutral unlike the fundamental component (which are subtracted when they are ⁇ 120° out of phase).
- Nrms I unbalancerms + I R Komopolar + Is homopolar + ⁇ Thomopolar (EC.18. RMS equation that circulates through the neutral in unbalanced systems)
- Said passive stabilizer is designed with a synchronization system with the electrical network to avoid failures when one or more phases of the distribution system are lost.
- the device of the invention is connected in parallel to the loads of the system specifically in the first branch of the low voltage distribution circuit, as shown in Fig. 4, which shows the connection of the invention 410, in a determined connection point between a transformer 404, poles 402 and connected by line 406.
- Fig. 5 shows the circuit explained in Fig. 1, but with the invention 502 connected in parallel between each of the RST phases associated with the single-phase loads 504 and the neutral 508.
- A s (Eq.20. Area of each leg of the nucleus)
- A is the area in cm 2 of each leg of the triphasic core of the Stabilizer of the invention and S is the apparent power in "Volt Amper" of each leg of the reactor.
- N b ( ⁇ c. 21. Equation that defines the number of turns that each leg of the core of the invention will have)
- N b number of coil turns per leg
- N Efi number of voltages per leg of the Stabilizer of the invention
- V v0 coil voltage per phase of the Stabilizer of the invention 2 * Ephase
- N v number of coil turns for each layer
- N s phases number of phases in the electrical distribution system
- Fig. 6 For the particular case of a three-phase distribution system, fed at E& Volts, the equivalent circuit of the stabilizer of the invention is shown in Fig. 6. It shows 3 equivalent circuits per phase 600, with the respective connections through their network phases R 602, S 616 and T 630.
- the numbers of the legs in phases S and T are omitted, but it must be understood that for the 3 phases it is the same core 652.
- generator 602, 616 and 630 is the same triphasic generator for each phase, but with their respective offsets in degrees.
- coils 604, 610, 618, 624, 632 and 638 are installed on the first leg 646, coils 608, 612, 622, 626, 636 and 640 are installed on the second leg 648 and coils 606, 614, 620, 628, 634, and 644 are installed on the third leg, 650, of the three-phase core.
- first coil 604 of phase R is connected in series between the phase R generator of the three-phase electrical system 602 and a second coil 606 located in the third leg 650 of the three-phase core, in such a way that said connection of said first and second coils 604 and 606, respectively, always generate opposite magnetic flux directions between them. This is achieved by reversing the input of the current in each of the coils, as shown in the connection in Fig. 600.
- N v — (Eq.23. Equation of the number of turns of each coil in a three-phase system)
- the total number of layers or coils is given by the ratio of the number of turns divided by the number of phases and divided by 2 to achieve the nulling torque effect. This can be seen in Figs. 7 and 8.
- Fig. 700 shows the 6 layers per leg, formed by pairs of coils 702, 704 and 706 respectively, associated to each phase R, S and T
- the orientation of each coil responds to what is indicated in Fig. 6.
- Fig. 7 the size of the coils in Fig. 7 is for reference only and is not intended to indicate, in any way, that one coil has more "turns” than another. Each coil has the same number Nv of turns. The visual effect sought is to show "layers", one coil on top of the other.
- the stabilizer of the invention mixes the flows of the three phases building multiple crossovers in even layers (For example 802 with 804, 806 with 804 and 802 with 806 in phase R), thus we achieve in every situation the effect of compensating the unbalance currents of the circuit, maintaining the balance in the network and in the Stabilizer of the invention.
- Fig. 9 describes the vector diagram of the connection of the invention, which allows demonstrating that the connection described in Fig. 6 generates, in each leg, the voltage corresponding to each phase.
- Fig. 10 describes in another way what is stated in Fig. 9, where item 1000 shows the electromagnetic flows that occur in each leg 1008, 1010 and 1012 of the stabilizer of the invention, and the direction they take in each leg.
- item 1000 shows the electromagnetic flows that occur in each leg 1008, 1010 and 1012 of the stabilizer of the invention, and the direction they take in each leg.
- the foregoing allows demonstrating that in each leg 1008, 1010 and 1012, voltage is generated, and that the connection of the invention does not generate short circuits at any time, product of the cancellation of magnetic fluxes thanks to the connection described in Fig. 6 , for each of the phases.
- Item 1102 shows the case of how the voltage of one phase is calculated from the E& calculation of the resulting vector 1110. For simplicity, the voltage calculation for the other 2 phases is not shown, since the person skilled in the art will know how to understand which is the same form in each case.
- Said voltage E& is made up of the algebraic sum of the breaks that each magnetic flux 1104, 1106, 1108 generate.
- Item 1112 shows how the voltage of each coil is obtained. As there are 4 changes in the flow direction, the phase voltage E& is divided by 4, obtaining E0/4.
- Fig. 12 shows that having a 120° phase shift, the voltage vectors will form three obtuse triangles 1204 and 1206, 1204 and 1208; and 1208 1206. Applying known triangle geometry (See Fig. 13), the voltage drop in one of the coils of the stabilizer of the invention is calculated. [0150] By having a 120° phase shift, the voltage vectors will form three obtuse triangles. Applying known triangle geometry, the voltage drop in one of the coils of the Stabilizer of the invention is calculated.
- Table 1-B shows the effect that the use of the invention has on power factor (PF) correction.
- Table 1-C shows the effect that the use of the invention has in reducing the current that flows through the neutral of the three-phase system, which is produced by harmonic contamination.
- Table 1-A Total current harmonic distortion reduction (THDi) for each phase L1, L2 and L3
- a particular application of the stabilizer of the invention is its possibility of use in two-phase systems. This is because the stabilizer of the invention is capable of absorbing the homopolar currents of a two-phase electrical power distribution network (balanced and unbalanced).
- the flow cancellation method contemplates 2 phases per leg in the reactor core with 4 breaks per leg in the reactor core at 25% each of the flow vectors of the 2 phases and is capable of generating an efficiency registered 85% absorption.
- FIG. 16 shows the vector diagram of the stabilizer of the invention in a three-phase system, where the phases are separated by 180°.
- each coil of each phase is built up in layers.
- the first leg 1706 has 4 coils, 2 corresponding to phase R (1702) and 2 to phase S (1704). The same configuration is repeated on the 1708 leg.
- Fig. 18 shows the direction that the magnetic fluxes per phase, 1802 and 1804, describe in each leg 1806 and 1808.
- Figs. 19 to 21 show the different ways that the prior art presented to solve the issue of harmonics, but without achieving the technical effects of the invention.
- US Pat. No. 6,043,569 A teaches an apparatus for reducing zero-sequence harmonic currents and voltages generated by non-linear loading in three single-phase circuits, which are combined to form a six-phase branch circuit. wires, and its three-phase four-wire distribution system source, said apparatus comprising a three-phase zig-zag autotransformer, which has three pairs of phase and neutral terminals; and means for respectively connecting the phase and neutral terminals of the zig-zag autotransformer in parallel with the six-wire branch circuit at the load end thereof.
- composition includes 2 phases per leg in the reactor core with a 50% flow break for each vector, as shown in Fig. 19. In addition, its registered efficiency is 65% absorption.
- patent document CL 2007001057 A1 (Veloso, Luis) that teaches a zero-sequence harmonic suppression system for unbalanced three-phase systems with non-linear loads, where the flow distribution occurs in proportions of 25 % on each of the three legs possessed by the suppressor.
- the flow cancellation method contemplates 3 phases per leg in the reactor core with 2 flow breaks at 50% the first phase and 25% the other two phases of each vector. This can be seen in Fig. 20.
- the registered efficiency is 75% absorption.
- patent document ES 2575589 A1 (Enriquez Hochreiter, Miguel; Garc ⁇ a Hoya, Miguel), referring to a three-phase autotransformer device in which multiple windings connected in zig-zag are involved, characterized in that such The windings are arranged concentrically, with 2 crossings with the windings of the different phases on a single three-phase core and reversing the direction of each winding at least twice.
- Said invention mitigates the "triplens" harmonic currents of a low voltage industrial or home network for a balanced system, thanks to the cancellation of flows that includes 2 phases per leg in the core of the reactor with 2 flow breaks at 50 % the first phase and 25% the second of each vector (See Fig.21).
- the indicated efficiency is 65% absorption.
- the stabilizer of the invention is made up of the following control and protection elements for safe and reliable operation.
- IEC International Electrotechnical Commission. lo: Phase current (for phases R, S, T).
- Irms effective current.
- kV kilovolt.
- kVA Kilo Volt Ampere.
- kW Kilowatts.
- Lb Coil length
- V0 Phase voltage (for phases R, S, T).
- Vrms effective voltage
- THD Total Harmonic Distortion.
- W Angular frequency
- Y Star connection of a transformer.
- Feeder Circuit that is part of the Distribution Network that extends from a Primary Distribution Substation or from a feeder owned by another Distribution Company, from where it receives energy, to the connection point where Customer facilities are connected. and Users.
- Harmonic Distortion It is the distortion of the sinusoidal wave of electrical current or voltage of nominal frequency, caused by the presence of sinusoidal electrical signals of different frequencies of multiples of said nominal frequency.
- Distributor or Distributor Company Distributor company(s) concessionaire(s) of the public distribution service or anyone that provides the distribution service, whether as owner, lessee, usufructuary or that operates, in any capacity, electric power distribution facilities.
- Power Factor The Power Factor is the relationship between the active energy (expressed in kW) and the apparent power (expressed in kVA) that is consumed or injected at a certain point in a network.
- Phase Conductor that carries electrical current.
- R”, S”, “T” three phases (“R”, “S”, “T”) and a neutral “N”.
- Nominal Voltage It is the voltage between the phase and the neutral, in the case of single-phase systems, and between phases in the case of other systems, by which a network, substation or User installation is named or identified.
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Abstract
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Applications Claiming Priority (2)
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US202163275547P | 2021-11-04 | 2021-11-04 | |
US63/275,547 | 2021-11-04 |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6043569A (en) | 1998-03-02 | 2000-03-28 | Ferguson; Gregory N. C. | Zero phase sequence current filter apparatus and method for connection to the load end of six or four-wire branch circuits |
CL2007001057A1 (es) | 2007-04-13 | 2009-02-13 | Inversiones Patrimonio Uno Spa | Dispositivo, sistema y transformador supresor de armonicos de secuencia cero (sac), para sistemas trifasicos desbalanceados con cargas no lineales. |
US20110148556A1 (en) * | 2008-09-17 | 2011-06-23 | Hoon-Yang Park | Power quality improvement device and power supply system |
US20110148391A1 (en) * | 2009-12-18 | 2011-06-23 | Rosendin Electric, Inc. | Various methods and apparatuses for an integrated zig-zag transformer |
CN202218017U (zh) * | 2011-09-07 | 2012-05-09 | 深圳市新恒基电气有限公司 | 移相磁性滤波器 |
US8497755B2 (en) * | 2008-01-30 | 2013-07-30 | Hoon-Yang Park | Hybrid transformer with transformation and improved harmonics functions, unbalanced current, and a power supply system thereof |
ES2575589A1 (es) | 2014-12-29 | 2016-06-29 | Miguel ENRÍQUEZ HOCHREITER | Sistema de ahorro de electricidad mediante múltiples bobinas de inducción con sistema de control de ajuste de tensión y programable |
US20160276099A1 (en) * | 2015-03-20 | 2016-09-22 | The Boeing Company | Multi-Phase Autotransformer |
US11005265B1 (en) * | 2019-12-18 | 2021-05-11 | Switched Source LLC | System and method for implementing a zero-sequence current filter for a three-phase power system |
-
2022
- 2022-11-02 WO PCT/CL2022/050110 patent/WO2023077247A1/es active Application Filing
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6043569A (en) | 1998-03-02 | 2000-03-28 | Ferguson; Gregory N. C. | Zero phase sequence current filter apparatus and method for connection to the load end of six or four-wire branch circuits |
CL2007001057A1 (es) | 2007-04-13 | 2009-02-13 | Inversiones Patrimonio Uno Spa | Dispositivo, sistema y transformador supresor de armonicos de secuencia cero (sac), para sistemas trifasicos desbalanceados con cargas no lineales. |
US8497755B2 (en) * | 2008-01-30 | 2013-07-30 | Hoon-Yang Park | Hybrid transformer with transformation and improved harmonics functions, unbalanced current, and a power supply system thereof |
US20110148556A1 (en) * | 2008-09-17 | 2011-06-23 | Hoon-Yang Park | Power quality improvement device and power supply system |
US20110148391A1 (en) * | 2009-12-18 | 2011-06-23 | Rosendin Electric, Inc. | Various methods and apparatuses for an integrated zig-zag transformer |
CN202218017U (zh) * | 2011-09-07 | 2012-05-09 | 深圳市新恒基电气有限公司 | 移相磁性滤波器 |
ES2575589A1 (es) | 2014-12-29 | 2016-06-29 | Miguel ENRÍQUEZ HOCHREITER | Sistema de ahorro de electricidad mediante múltiples bobinas de inducción con sistema de control de ajuste de tensión y programable |
US20160276099A1 (en) * | 2015-03-20 | 2016-09-22 | The Boeing Company | Multi-Phase Autotransformer |
US11005265B1 (en) * | 2019-12-18 | 2021-05-11 | Switched Source LLC | System and method for implementing a zero-sequence current filter for a three-phase power system |
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