WO1997021264A1 - Power supply for non-linear loads - Google Patents
Power supply for non-linear loads Download PDFInfo
- Publication number
- WO1997021264A1 WO1997021264A1 PCT/SE1996/001539 SE9601539W WO9721264A1 WO 1997021264 A1 WO1997021264 A1 WO 1997021264A1 SE 9601539 W SE9601539 W SE 9601539W WO 9721264 A1 WO9721264 A1 WO 9721264A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zero
- inductor
- power supply
- phase
- core
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
Definitions
- the present invention relates to three-phase power supplies for non ⁇ linear loads, especially to such with lamp fittings for gas discharge tubes, like high pressure sodium lamps. Electric plants with a great number of fittings in parallel are used for example in green house cultivation and for road lighting.
- a discharge tube constitutes from an electrical point of view a non- linear element, which requires a current-limiting inductor in series, and which generates an approximately square wave load voltage, causing harmonic currents in the supply network.
- the inductor makes the current from the supply highly inductive, and for phase compensation a capacitor is usually connected in parallel to the inductor plus lamp. If this is not done, the fundamental compo ⁇ nent of the supply current can be more than twice as high, as when compensated, and the power losses in the network increase con ⁇ siderably.
- Inserting capacitors in a network may cause problems because of re ⁇ sonance phenomena between them and the inductance of the net-work, mainly originating from the supply transformer of the plant.
- Resonance implies amplification of harmonic currents and gives rise to increased losses in bars, cables and transformers.
- a typical supply voltage for a lamp fitting is 230 V, corresponding to the phase voltage of a 400 V system.
- the fittings are therefore usually connected between phase and neutral in a three-phase system.
- the dominating harmonic is the third, which has the property of hav ⁇ ing the same phase position in all phases. In other words, it appears as a zero-sequence current. It adds up in the neutral conductor, which therefore carries a three times as big third harmonic current as the phase conductors, and it appears as a circulating current in the primary delta winding of the supply transformer, causing losses and heating.
- the invention aims at a solution which in a simple, inexpensive and flexible way reduces the third harmonic current to a harmless level.
- Figure 1 shows a three-phase plant of current design
- Figure 2 an equivalent diagram
- Figure 3 an equivalent diagram of a plant according to one alternative of the invention
- Figure 4 to another alternative
- Figure 5 shows the zero- inductor in a preferred version
- Figure 6 a further developcment of the invention in a preferred version.
- Figure 1 shows a three-phase plan t wilh a ⁇ /Y-0 connected trans ⁇ former 1 having the loads 2 connected between phases and neutral.
- Figure 2 shows a simplified diagram for a group of lamp fittings, drawn as one fitting 2 per phase, with lamp 3, series inductor 4 and capacitor 5.
- Figure 3 shows one version of the zero-inductor 6. It has three essentially equal windings each of them connected in series with a phase coductor all magnetizing the core in the same direction. It is so dimensioned, that its impedance for the third harmonic, generated by the lamps, is high. In consequence the main part of this current finds its way through the phase-compensating capacitors and only a minor part flows through the network.
- the zero-inductor effectively impedes a third harmonic amplification caused by a resonance between capacitors and network impedance.
- the third harmonic voltage across a winding of the inductor is in the order of 10 V when the phase voltage is 230 V.
- Figure 4 shows a power system with the neutral conductor (N) threaded through the zero-inductor 6 forming a single-turn winding. It is dimensioned in the same way as above.
- the zero-inductor encircles the inductor without breaking it, which is desirable from a safety point of view.
- Figure 5 shows a similar system wi th the three phase conductors threaded through the zero-inductor. It is dimensioned using the same principles as outlined above and it functions in the same way.
- An advantage is, that it can be placed anywhere in the network independ ⁇ ently of if it is a 4- or 5-conductor system.
- the iron core of the zero-inductor has no air gap and can be a ring core made of oriented transformer iron. It is designed for a few volts of fundamental voltage. For higher voltages it will saturate, and then the zero-inductor only represents a low impedance. This design keeps down the size of the zero-inductor to a minimum and also ensures that no large voltage asymmetries appear, if the load current becomes asymmetrical, for example when a fuse breaks.
- Figure 6 shows a further development of the invention.
- the zero- inductor 6 is provided with one or more multi-turn windings 8 connected to circuits 7 comprising capacitors.
- circuits 7 comprising capacitors.
Landscapes
- Inverter Devices (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU10453/97A AU1045397A (en) | 1995-12-05 | 1996-11-26 | Power supply for non-linear loads |
JP9521194A JP2000501878A (en) | 1995-12-05 | 1996-11-26 | Power supply for nonlinear load |
EP96941260A EP0867061A1 (en) | 1995-12-05 | 1996-11-26 | Power supply for non-linear loads |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9504342-8 | 1995-12-05 | ||
SE9504342A SE515520C2 (en) | 1995-12-05 | 1995-12-05 | Lighting system with zero sequence current inductor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997021264A1 true WO1997021264A1 (en) | 1997-06-12 |
Family
ID=20400470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1996/001539 WO1997021264A1 (en) | 1995-12-05 | 1996-11-26 | Power supply for non-linear loads |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0867061A1 (en) |
JP (1) | JP2000501878A (en) |
AU (1) | AU1045397A (en) |
SE (1) | SE515520C2 (en) |
WO (1) | WO1997021264A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999055124A1 (en) * | 1998-04-18 | 1999-10-28 | Manfred Diez | Method for operating a gaseous discharge lamp and system for carrying out such a method |
DE10225409A1 (en) * | 2002-06-07 | 2003-12-24 | Epcos Ag | Current-compensated choke and circuit arrangement with the current-compensated choke |
DE102010044621A1 (en) * | 2010-09-02 | 2012-03-08 | Siemens Aktiengesellschaft | Device for suppressing high-frequency currents in supply lines of an inverter |
WO2020047551A1 (en) | 2018-08-31 | 2020-03-05 | Baker Hughes, A Ge Company, Llc | High frequency ac noise suppression within transformers |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5033215B2 (en) * | 2010-04-19 | 2012-09-26 | 株式会社因幡電機製作所 | Street light |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1727834A (en) * | 1920-05-15 | 1929-09-10 | Bbc Brown Boveri & Cie | Rectifying system |
DE3525877A1 (en) * | 1984-07-19 | 1986-01-23 | Fuji Electrochemical Co., Ltd., Tokio/Tokyo | NOISE PROTECTION FILTER |
US4651266A (en) * | 1984-02-16 | 1987-03-17 | Fanuc Ltd | High-frequency noise absorbing circuit |
US5323304A (en) * | 1992-01-27 | 1994-06-21 | Georator Corporation | A.C. storage module for reducing harmonic distortion in an A.C. waveform |
WO1995020308A1 (en) * | 1994-01-21 | 1995-07-27 | A/S Martin Hansen | Method for supplying a lighting plant with power, a lighting plant and use hereof |
EP0684679A1 (en) * | 1994-05-26 | 1995-11-29 | Abb Stromberg Kojeet Oy | Method for reducing waveform distortion in an electrical utility system and circuit for an electrical utility system |
-
1995
- 1995-12-05 SE SE9504342A patent/SE515520C2/en not_active IP Right Cessation
-
1996
- 1996-11-26 AU AU10453/97A patent/AU1045397A/en not_active Abandoned
- 1996-11-26 JP JP9521194A patent/JP2000501878A/en active Pending
- 1996-11-26 EP EP96941260A patent/EP0867061A1/en not_active Withdrawn
- 1996-11-26 WO PCT/SE1996/001539 patent/WO1997021264A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1727834A (en) * | 1920-05-15 | 1929-09-10 | Bbc Brown Boveri & Cie | Rectifying system |
US4651266A (en) * | 1984-02-16 | 1987-03-17 | Fanuc Ltd | High-frequency noise absorbing circuit |
DE3525877A1 (en) * | 1984-07-19 | 1986-01-23 | Fuji Electrochemical Co., Ltd., Tokio/Tokyo | NOISE PROTECTION FILTER |
US5323304A (en) * | 1992-01-27 | 1994-06-21 | Georator Corporation | A.C. storage module for reducing harmonic distortion in an A.C. waveform |
WO1995020308A1 (en) * | 1994-01-21 | 1995-07-27 | A/S Martin Hansen | Method for supplying a lighting plant with power, a lighting plant and use hereof |
EP0684679A1 (en) * | 1994-05-26 | 1995-11-29 | Abb Stromberg Kojeet Oy | Method for reducing waveform distortion in an electrical utility system and circuit for an electrical utility system |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999055124A1 (en) * | 1998-04-18 | 1999-10-28 | Manfred Diez | Method for operating a gaseous discharge lamp and system for carrying out such a method |
DE10225409A1 (en) * | 2002-06-07 | 2003-12-24 | Epcos Ag | Current-compensated choke and circuit arrangement with the current-compensated choke |
DE10225409B4 (en) * | 2002-06-07 | 2020-03-19 | Tdk Electronics Ag | Current-compensated choke and circuit arrangement with the current-compensated choke |
DE102010044621A1 (en) * | 2010-09-02 | 2012-03-08 | Siemens Aktiengesellschaft | Device for suppressing high-frequency currents in supply lines of an inverter |
US20130201734A1 (en) * | 2010-09-02 | 2013-08-08 | Siemens Aktiengesellschaft | Device for suppressing high-frequency currents in infeed lines of an inverter |
WO2020047551A1 (en) | 2018-08-31 | 2020-03-05 | Baker Hughes, A Ge Company, Llc | High frequency ac noise suppression within transformers |
EP3844787A4 (en) * | 2018-08-31 | 2022-06-08 | Baker Hughes Holdings LLC | High frequency ac noise suppression within transformers |
Also Published As
Publication number | Publication date |
---|---|
EP0867061A1 (en) | 1998-09-30 |
SE515520C2 (en) | 2001-08-20 |
SE9504342D0 (en) | 1995-12-05 |
AU1045397A (en) | 1997-06-27 |
JP2000501878A (en) | 2000-02-15 |
SE9504342L (en) | 1997-06-06 |
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