EP0257291B1 - Circuit arrangement for the wiring of high power transformers - Google Patents
Circuit arrangement for the wiring of high power transformers Download PDFInfo
- Publication number
- EP0257291B1 EP0257291B1 EP87110408A EP87110408A EP0257291B1 EP 0257291 B1 EP0257291 B1 EP 0257291B1 EP 87110408 A EP87110408 A EP 87110408A EP 87110408 A EP87110408 A EP 87110408A EP 0257291 B1 EP0257291 B1 EP 0257291B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- stage
- stepped
- parallel
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
-
- 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
- H01F27/343—Preventing or reducing surge voltages; oscillations
Definitions
- the invention relates to a circuit arrangement for large power transformers with an undervoltage, an overvoltage master and a step winding in connection and counter-connection as well as with a star-point-side step switching device, wherein a capacitor is provided in parallel with the step winding in series with a resistor, which together form an RC Represent link and by their dimensioning significantly reduce the resonance amplitudes of the connection point of the step winding to the high-voltage main winding against earth.
- Windings of transformers have certain natural resonance frequencies. If the frequency matches, an oscillating switching voltage applied from the outside can excite these natural vibrations and lead to very high internal stresses for the insulation of the winding.
- an oscillating switching voltage applied from the outside can excite these natural vibrations and lead to very high internal stresses for the insulation of the winding.
- the vibrations with the natural frequency of the step winding can be particularly unpleasant. These voltage vibrations also influence the end of the main winding in certain positions of the tap changer, especially in counter-switching, and also lead to voltage increases here and thereby endanger the insulation.
- n C the capacitive transmission ratio of the main / step winding
- n T the inductive transmission ratio of the main / step winding (less than zero for counter-switching)
- Q the quality at the natural frequency of the step winding
- the invention is therefore based on the object of providing an arrangement for the harmless absorption of overvoltages on transformer windings originating from oscillating switching voltages and thereby further reducing the required space compared to that of the known solution.
- this object is achieved in a circuit arrangement of the type mentioned at the outset in that the RC element comprising the capacitor and the resistor is only connected in parallel to a single stage of the multi-stage winding and that the transformer coupling of this stage to the other stages also leads to the these occurring resonance amplitudes are reduced.
- Advantageous embodiments of the invention consist in that the RC element is connected in parallel with an odd number of stages to an electrically intermediate stage between the first and the last stage of the stage winding, or in that the RC element with an even number of stages is connected in parallel to a stage electrically located at the center of the stage winding.
- the circuit arrangement according to the invention is very advantageous because it simultaneously ensures optimal protection of the step winding against oscillating switching impulse voltages with a minimal space requirement. Surprisingly, it has been shown that when using an appropriately dimensioned and quite space-consuming RC link with an improved effectiveness, the overall arrangement requires a reduced volume compared to the known arrangement.
- An undervoltage winding 12, a high-voltage main winding 13 and a step winding 14 with taps 0 to 10 are arranged in a conventional manner, concentrically around a core leg 11, from the inside outwards.
- the taps 0 to 10 can be selected by contact arms 15 of a selector 16 and one of the contact arms 15 is connected to the star point of the transformer by an uninterrupted switching load switch 17.
- the ends of the step winding 14 are connected to fixed contacts in a turner 18, the movable contact of which lies at the low-voltage end of the high-voltage master winding 13.
- the voltages of the windings 13 and 14 are added in the switching position of the inverter 18 shown in dashed lines and subtracted in the switching position shown in solid lines.
- a capacitor 19 is now connected between the diversions or taps 5 and 6 of the step winding 14, which greatly reduces the capacitively transmitting voltage.
- a damping resistor 20 is connected upstream of the capacitor 19 in order to dampen its charging currents and to reduce the quality factor.
- the capacitor 19 and the damping resistor 20 together form an RC element.
- the volume required jointly for the step winding and the RC element drops compared to an arrangement in which the entire step winding or each individual step of the step winding is connected to an RC element.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Power Conversion In General (AREA)
- Regulation Of General Use Transformers (AREA)
- Coils Of Transformers For General Uses (AREA)
- Emergency Protection Circuit Devices (AREA)
- Keying Circuit Devices (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
- Switch Cases, Indication, And Locking (AREA)
Abstract
Description
Die Erfindung betrifft eine Schaltungsanordnung für Leistungsgroßtransformatoren mit einer Unterspannungs-, einer Oberspannungsstamm- und einer Stufenwicklung in Zu- und Gegenschaltung sowie mit einer sternpunktseitigen Stufenschalteinrichtung, wobei elektrisch parallel zu der Stufenwicklung ein Kondensator in Reihe mit einem Widerstand vorgesehen ist, die zusammen ein R-C-Glied darstellen und durch ihre Dimensionierung die Resonanzamplituden des Anschlußpunktes der Stufenwicklung an die Oberspannungsstammwicklung gegen Erde erheblich vermindern.The invention relates to a circuit arrangement for large power transformers with an undervoltage, an overvoltage master and a step winding in connection and counter-connection as well as with a star-point-side step switching device, wherein a capacitor is provided in parallel with the step winding in series with a resistor, which together form an RC Represent link and by their dimensioning significantly reduce the resonance amplitudes of the connection point of the step winding to the high-voltage main winding against earth.
Wicklungen von Transformatoren haben bestimmte Eigenresonanzfrequenzen. Eine von außen anliegende, schwingende Schaltspannung kann bei Übereinstimmung der Frequenz diese Eigenschwingungen anregen und zu sehr hohen inneren Spannungsbeanspruchungen für die Isolierung der Wicklung führen. Beim Aufbau von Oberspannungswicklungen aus einer Stammwicklung und einer zugehörigen Stufenwicklung in Zu- und Gegenschaltung können die Schwingungen mit der Eigenfrequenz der Stufenwicklung besonders unangenehm sein. Diese Spannungsschwingungen beeinflussen in bestimmten Stellungen des Stufenschalters, insbesondere in Gegenschaltung auch das Ende der Stammwicklung und führen auch hier zu Spannungsüberhöhungen und gefährden dadurch die Isolierung.Windings of transformers have certain natural resonance frequencies. If the frequency matches, an oscillating switching voltage applied from the outside can excite these natural vibrations and lead to very high internal stresses for the insulation of the winding. When building high-voltage windings from a main winding and an associated step winding in connection and counter-connection, the vibrations with the natural frequency of the step winding can be particularly unpleasant. These voltage vibrations also influence the end of the main winding in certain positions of the tap changer, especially in counter-switching, and also lead to voltage increases here and thereby endanger the insulation.
Das Verhältnis der Resonanzamplitude am Ende der Stammwicklung zur Schaltspannungsamplitude am Eingang errechnet sich aus
Um die Resonanzamplituden an dieser Stelle zu reduzieren ist bereits vorgeschlagen worden, räumlich zwischen Stamm- und Stufenwicklung einen elektrostatischen Schirmzylinder anzuordnen, der an das Sternpunktpotential angelenkt wird und die beiden Wicklungen elektrisch voneinander entkoppelt, weil durch diese Maßnahme nC annähernd Null wird. Dieser Schirmzylinder ist jedoch technisch schwierig ausführbar und beansprucht darüberhinaus wertvollen Platz im Kernfenster des Transformators, so daß dieser durch die Schirmmaßnahme vergrößert und verteuert ist.In order to reduce the resonance amplitudes at this point, it has already been proposed to arrange an electrostatic shield cylinder spatially between the main and step windings, which is articulated to the star point potential and electrically decouples the two windings because this measure makes n C almost zero. However, this shield cylinder is technically difficult to carry out and moreover takes up valuable space in the core window of the transformer, so that this is enlarged and made more expensive by the shielding measure.
Durch die EP-A1-0 141 296 ist es auch schon bekannt, zur Spannungssteuerung an Wicklungen und Transformatoren der Stufenwicklung ein R-C-Glied elektrisch parallel zu schalten. Dadurch werden nicht nur die Resonanzamplituden abgesenkt, sondern dadurch werden auch auftretende Spannungsschwingungen gedämpft, weil sich gleichzeitig auch der Gütefaktor ändert. Durch die Beschaltung der gesamten Stufenwicklung mit einem R-C-Glied ist hierbei jedoch ein nicht unerheblicher Aufwand für die erforderliche Werkstoffmenge und für den zu dessen Unterbringung erforderlichen Raum im Transformatorkessel erforderlich.From EP-A1-0 141 296 it is also known to connect an RC element electrically in parallel for voltage control on windings and transformers of the step winding. This not only lowers the resonance amplitudes, it also dampens the voltage oscillations that occur because the quality factor also changes at the same time. By connecting the entire step winding with an RC element, however, this is a not inconsiderable effort for the required amount of material and for the space required to accommodate it in the transformer tank.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Anordnung zur schadlosen Aufnahme von aus schwingenden Schaltspannungen herrührenden Überspannungen an Transformatorwicklungen zu schaffen und dabei den erforderlichen Raumbedarf gegenüber dem der bekannten Lösung weiter zu verringern.The invention is therefore based on the object of providing an arrangement for the harmless absorption of overvoltages on transformer windings originating from oscillating switching voltages and thereby further reducing the required space compared to that of the known solution.
Erfindungsgemäß wird diese Aufgabe bei einer Schaltungsanordnung der eingangs genannten Art dadurch gelöst, daß das R-C-Glied aus dem Kondensator und dem Widerstand lediglich zu einer einzigen Stufe der vielstufigen Stufenwicklung parallelgeschaltet ist und daß über die transformatorische Kopplung dieser Stufe mit den übrigen Stufen auch die in diesen auftretenden Resonanzamplituden verkleinert sind.According to the invention, this object is achieved in a circuit arrangement of the type mentioned at the outset in that the RC element comprising the capacitor and the resistor is only connected in parallel to a single stage of the multi-stage winding and that the transformer coupling of this stage to the other stages also leads to the these occurring resonance amplitudes are reduced.
Vorteilhafte Ausgestaltungen der Erfindung bestehen darin, daß das R-C-Glied bei einer ungeradzahligen Anzahl von Stufen zu einer elektrisch in der Mitte zwischen der ersten und der letzten Stufe der Stufenwicklung liegenden Stufe parallelgeschaltet ist bzw. daß das R-C-Glied bei einer geradzahligen Anzahl von Stufen zu einer elektrisch an der Mitte der Stufenwicklung liegenden Stufe parallelgeschaltet ist.Advantageous embodiments of the invention consist in that the RC element is connected in parallel with an odd number of stages to an electrically intermediate stage between the first and the last stage of the stage winding, or in that the RC element with an even number of stages is connected in parallel to a stage electrically located at the center of the stage winding.
Die erfindungsgemäße Schaltungsanordnung ist sehr vorteilhaft, denn sie gewährleistet bei minimalem Raumbedarf gleichzeitig einen optimalen Schutz der Stufenwicklung gegenüber schwingenden Schaltstoßspannungen. Überraschenderweise hat sich gezeigt, daß beim Einsatz eines entsprechend dimensionierten und für sich recht raumaufwendigen R-C-Gliedes bei einer verbesserten Wirksamkeit die Gesamtanordnung ein gegenüber der bekannten Anordnung verringertes Volumen erfordert.The circuit arrangement according to the invention is very advantageous because it simultaneously ensures optimal protection of the step winding against oscillating switching impulse voltages with a minimal space requirement. Surprisingly, it has been shown that when using an appropriately dimensioned and quite space-consuming RC link with an improved effectiveness, the overall arrangement requires a reduced volume compared to the known arrangement.
Ein Ausführungsbeispiel der Erfindung ist anhand einer Zeichnung näher erläutert.An embodiment of the invention is explained in more detail with reference to a drawing.
Konzentrisch um einen Kernschenkel 11 sind in üblicher Weise von innen nach außen aufeinanderfolgend eine Unterspannungswicklung 12, eine Oberspannungsstammwicklung 13 sowie eine Stufenwicklung 14 mit Anzapfungen 0 bis 10 angeordnet.An undervoltage winding 12, a high-voltage main winding 13 and a step winding 14 with taps 0 to 10 are arranged in a conventional manner, concentrically around a
Die Anzapfungen 0 bis 10 sind durch Kontaktarme 15 eines Wählers 16 anwählbar und je einer der Kontaktarme 15 ist durch einen unterbrechungslos schaltenden Lastschalter 17 mit dem Sternpunkt des Transformators verbunden. Die Enden der Stufenwicklung 14 sind mit Festkontakten in einem Wender 18 verbunden, dessen beweglicher Kontakt am niederspannungsseitigen Ende der Oberspannungsstammwicklung 13 liegt. Durch entsprechende Ausführung des Wickelsinns der Oberspannungsstammwicklung 13 und in der Stufenwicklung 14 werden bei der gestrichelt dargestellten Schaltstellung des Wenders 18 die Spannungen der Wicklungen 13 und 14 addiert und bei der ausgezogen dargestellten Schaltstellung subtrahiert.The taps 0 to 10 can be selected by
Erfindungsgemäß ist nun zwischen den Ausleitungen oder Anzapfungen 5 und 6 der Stufenwicklung 14 ein Kondensator 19 geschaltet der die kapazitiv übertragende Spannung stark vermindert. Dabei ist dem Kondensator 19 zur Dämpfung seiner Ladeströme und zur Verkleinerung des Gütefaktors ein Dämpfungswiderstand 20 vorgeschaltet.According to the invention, a
Der Kondensator 19 und der Dämpfungswiderstand 20 bilden zusammen ein R-C-Glied. Durch Konzentration des erforderlichen Kondensatorvolumens auf eine einzige, vorzugsweise auf die zwischen den Anzapfungen 5 und 6 liegende Stufe ergibt sich zusammen mit einem geeignet bemessenen Dämpfungswiderstand 20 nicht nur eine starke Dämpfung der Wicklungseigenfrequenz, sondern auch eine Reduzierung der Überschwingfaktoren innerhalb der Stufenwicklung bei induzierter Blitzstoßspannung. Gleichzeitig sinkt überraschenderweise das für die Stufenwicklung und das R-C-Glied gemeinsam erforderliche Volumen gegenüber einer Anordnung in der die gesamte Stufenwicklung oder jede einzelne der Stufen der Stufenwicklung mit einem R-C-Glied beschaltet sind.The
Claims (3)
- A circuit arrangement for large power transformers with a low voltage winding (12), a high voltage main winding (13) and a stepped winding (14) in reversing connection, with a star-point-side stepped switch device (15,16,17), wherein electrically parallel to the stepped winding (14) there is provided a capacitor (19) in series with a resistor (20), which together represent an R-C-element and through their dimensioning the resonance amplitudes of the connecting point of the stepped winding (14) to the high voltage main winding (13), are considerably reduced relative to earth
characterised in that
- the R-C-element of the capacitor (19) and the resistor (20) is only connected in parallel to a single step of the multi-stepped stepped winding (14),
- wherein by way of the transformative coupling of this step to the remaining steps the resonance amplitudes occurring in these are also reduced. - A circuit arrangement according to claim 1, characterised in that the R-C-element is connected in parallel to the step lying electrically in the centre between the first and the last step of the stepped winding (14), when there are an odd number of steps.
- A circuit arrangement according to claim 1, characterised in that the R-C-element is connected in parallel to a step lying electrically at the centre between the first and the last step of the stepped winding (14), when there are an even number of steps.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87110408T ATE61886T1 (en) | 1986-07-30 | 1987-07-17 | CIRCUIT ARRANGEMENT FOR LARGE POWER TRANSFORMERS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3625845 | 1986-07-30 | ||
DE3625845 | 1986-07-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0257291A1 EP0257291A1 (en) | 1988-03-02 |
EP0257291B1 true EP0257291B1 (en) | 1991-03-20 |
Family
ID=6306352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87110408A Expired - Lifetime EP0257291B1 (en) | 1986-07-30 | 1987-07-17 | Circuit arrangement for the wiring of high power transformers |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0257291B1 (en) |
AT (1) | ATE61886T1 (en) |
BR (1) | BR8703907A (en) |
DE (1) | DE3768736D1 (en) |
ES (1) | ES2020972B3 (en) |
GR (1) | GR3001869T3 (en) |
PT (1) | PT85439B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023056538A1 (en) * | 2021-10-08 | 2023-04-13 | Reson Energy Ltda | Electric transformer with resonant primary and inductive secondary and method for manufacturing same |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0835548B1 (en) * | 1995-06-28 | 2006-02-01 | Eaton Power Quality Limited | Resonance tapped transformer |
EP0763833B2 (en) † | 1995-09-14 | 2012-12-05 | Bombardier Transportation GmbH | Transformer for an electrically driven vehicle |
DE69739888D1 (en) * | 1996-04-16 | 2010-07-08 | Markov Gennadij Aleksandr | TRANSFORMER |
EP2549645A1 (en) * | 2011-07-21 | 2013-01-23 | Telefonaktiebolaget LM Ericsson (publ) | Transformer filter arrangement |
CN102945735A (en) * | 2012-11-06 | 2013-02-27 | 保定天威集团有限公司 | Pre-magnetizing transformer with voltage regulator and manufacture method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0141296A1 (en) * | 1983-10-20 | 1985-05-15 | Siemens Aktiengesellschaft | Circuit arrangement for the wiring of high power transformers |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1658664A (en) * | 1927-07-06 | 1928-02-07 | Gen Electric | Variable-ratio transformer |
US1809895A (en) * | 1928-10-08 | 1931-06-16 | Frazer W Gay | Protective system for transformers |
CH275245A (en) * | 1948-11-11 | 1951-05-15 | Ceskoslovenske Z Tezkeho Stroj | Vibration-free transformer. |
FR2007394A1 (en) * | 1968-04-05 | 1970-01-09 | Licentia Gmbh | |
US3644786A (en) * | 1970-08-26 | 1972-02-22 | Westinghouse Electric Corp | Electrical windings |
US3668511A (en) * | 1971-02-16 | 1972-06-06 | Mc Graw Edison Co | Self energizing tap switch for electronic tap changer |
DE2117422A1 (en) * | 1971-04-08 | 1972-10-12 | Schorch Gmbh | Control transformer with surge voltage protected step winding |
-
1987
- 1987-07-17 DE DE8787110408T patent/DE3768736D1/en not_active Expired - Fee Related
- 1987-07-17 EP EP87110408A patent/EP0257291B1/en not_active Expired - Lifetime
- 1987-07-17 AT AT87110408T patent/ATE61886T1/en active
- 1987-07-17 ES ES87110408T patent/ES2020972B3/en not_active Expired - Lifetime
- 1987-07-29 PT PT85439A patent/PT85439B/en not_active IP Right Cessation
- 1987-07-29 BR BR8703907A patent/BR8703907A/en not_active IP Right Cessation
-
1991
- 1991-04-26 GR GR90401181T patent/GR3001869T3/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0141296A1 (en) * | 1983-10-20 | 1985-05-15 | Siemens Aktiengesellschaft | Circuit arrangement for the wiring of high power transformers |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023056538A1 (en) * | 2021-10-08 | 2023-04-13 | Reson Energy Ltda | Electric transformer with resonant primary and inductive secondary and method for manufacturing same |
Also Published As
Publication number | Publication date |
---|---|
ES2020972B3 (en) | 1991-10-16 |
ATE61886T1 (en) | 1991-04-15 |
GR3001869T3 (en) | 1992-11-23 |
PT85439B (en) | 1993-09-30 |
EP0257291A1 (en) | 1988-03-02 |
PT85439A (en) | 1988-07-29 |
BR8703907A (en) | 1988-04-05 |
DE3768736D1 (en) | 1991-04-25 |
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