CH262655A - Dry current transformer. - Google Patents
Dry current transformer.Info
- Publication number
- CH262655A CH262655A CH262655DA CH262655A CH 262655 A CH262655 A CH 262655A CH 262655D A CH262655D A CH 262655DA CH 262655 A CH262655 A CH 262655A
- Authority
- CH
- Switzerland
- Prior art keywords
- current transformer
- dry
- synthetic resin
- transformer according
- dry current
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Description
Trocken-Stromwandler. Die vorliegende Erfindung, als deren Ur heber Alfred Imhof (Schweiz) genannt wird, löst zwei IIauptprobleme im Stromwandlerbau durch ein und dieselbe Massnahme: Die Siche rung gegen die grossen elektrodynamischen Kräfte und die elektrische Trockenisolation. Beim erfindungsgemässen Trocken-Stromwand- ler befindet sich mindestens die primäre Stromwandlerwicklung im Innern eines Kör pers aus einem gehärteten Niederdruckharz, auch Kontaktharz genannt.
Diese Nieder druckharze lassen sich nur durch ihr Verlial- ten bei der Härtung definieren: Sie härten durch Polymerisation, geben also bei der Här tung keine flüchtigen Reaktionsprodukte ab, welche Anlass zu Blasen geben können, sieden nicht unterhalb der zur Polymerisation anzu- -xendenden Temperatur, und die Viskosität der monomeren Stoffe liegt innerhalb solcher Grenzen, dass keine Lösungsmittel nötig sind.
Aus diesen Eigenschaften folgt die weitere Besonderheit, dass die Polymerisation ohne wesentlichen Überdruck blasenfrei stattfindet. Die Erfindung betrifft auch ein Verfah ren zur Herstellung des Trocken-Stroinwand- lers, das dadurch gekennzeichnet ist, dass die jenigen Wicklungen, welche im Kunstharz ein gebettet werden, zuvor mit einem Stoff imprä gniert werden, welcher die Poren der aus Faserstoff bestehenden Drahtisolation füllt und sich in seinem Endzustand mit dem Kunstharz fugenlos bindet. Es kann dies wie derum ein Kontaktharz sein, sei es dasselbe, wie es für die Umgiessung angewandt wird, sei es ein anderes Harz.
Die Fig. 1 bis 8 zeigen verschiedene Aus führungsbeispiele, und zwar Fig. 1 bis 6 Stromwandler für Hochspannung, Fig. 7 und 8 Stromwandler für Niederspannung. Bei allen Beispielen bedeutet 1 den Eisenkern, 2 die primäre Wicklung, 3 die sekundäre Wick lung, 4 den Giesskörper aus Kunstharz, 5 den Isolator zur Verhinderung des Überschlages von den Stromzuleitungen nach der Sekundär wicklung und nach Erde. 6 ist ein elektrisch leitender Überzug. Dieser kann auch als me tallisches Gefäss ausgebildet sein.
Fig. 1 und 2 stellen einen StülZer-Wlek- lungs-Stromwandler dar, dessen Einführungs isolator 5 aus demselben Giessharz gebildet ist wie der übrige isolierende Teil 4, welcher die primäre Wicklung einhüllt.
Fig. 3 stellt einen Durchführungs-Wick- lungs-Stromwandler dar, der sieh von der Ausführung nach Fig. 1 und 2 nur dadurch unterscheidet, dass er zwei einander gegen überliegende Einführungsisolatoren besitzt.
Fig. 4 stellt ebenfalls einen Durchfüh- rungs-Wicklungs-Stromwandler dar, dessen Stromzu- und -ableitungen durch in das Kunstharz eintauchende Kondensatordurch- führungen geführt sind, das heisst durch Iso latoren bekannter Art, welche koaxial zum Stromleiter liegende leitende Kondensator- beläge 7 enthalten, um ihre dielektrische Be anspruchung zu steuern.
Es sind liier zwei ge trennte Eisenkerne angenommen, aber es än- dert an der Bauart nichts, wenn ein Mantel kern verwendet wird wie in Fig. 3. Unter suehungen haben gezeigt, dass mit Kontakt harzen längs der Berührungsschicht mit den Durchführungen eine ähnlich hohe elektrische Festigkeit erreicht wird wie mit den üblichen flüssigen Isolierstoffen.
Diese Ausführungsart ist dann geeignet, wenn mit der Ausführung nach Fig. 2 Gleitentladungen längs den Ein führungsisolatoren nicht mehr vermeidbar sind wegen zu grosser Spannungshöhe. In analoger Weise lässt sich der Stromwandler nach Fig. 1 und 2 mit einer Kondensator- Durchführung versehen.
Fig. 5 stellt einen Hänge-W icklungs-Strom- wandler dar, der mittels der öse 8 aufgehängt werden kann. Die Stromzuleitungsanschlüsse sind bei 9 und 10. Der Einführungsisolator 5 ist hier mit keramischen Schirmen 7 gegen die Witterung geschützt.
Fig. 6 stellt einen Durchführungs-Einstab- wandler dar. Der Stab 2 spielt die Rolle der primären Wicklung. Der Kunstharzkörper 4 kann den Eisenkern mit dessen Sekundär wicklung auch völlig umhüllen.
Fig. 7 stellt einen Niederspannings-Wick- lungs-Stromwandler mit Mantelkern dar. Hier hat der Kunstharzkörper in erster Linie die Aufgabe der Sicherung gegen die elektro dynamischen Kräfte. Wie in der Zeichnung punktiert angedeutet, kann er die Form eines Stützkörpers für den Stromwandler haben.
Fig. 8 stellt einen Niederspannungs-Ein- leiter-Stromwandler dar.
Dry current transformer. The present invention, whose originator Alfred Imhof (Switzerland) is named, solves two main problems in the construction of current transformers by one and the same measure: the protection against the large electrodynamic forces and the electrical dry insulation. In the dry current transformer according to the invention, at least the primary current transformer winding is located in the interior of a body made of a hardened low-pressure resin, also called contact resin.
These low-pressure resins can only be defined by their behavior during curing: they cure through polymerisation, so they do not give off any volatile reaction products during curing that could give rise to bubbles, and do not boil below the temperature to be used for polymerisation , and the viscosity of the monomeric substances is within such limits that no solvents are required.
Another special feature of these properties is that the polymerization takes place without any significant excess pressure. The invention also relates to a method for producing the dry current converter, which is characterized in that the windings which are embedded in the synthetic resin are previously impregnated with a substance which fills the pores of the wire insulation made of fiber and in its final state binds seamlessly with the synthetic resin. This can in turn be a contact resin, be it the same as it is used for the encapsulation, be it a different resin.
1 to 8 show different exemplary embodiments from, namely Fig. 1 to 6 current converter for high voltage, Fig. 7 and 8 current converter for low voltage. In all examples, 1 is the iron core, 2 is the primary winding, 3 is the secondary winding, 4 is the cast body made of synthetic resin, 5 is the insulator to prevent the power lines from flashing over to the secondary winding and to earth. 6 is an electrically conductive coating. This can also be designed as a me-metallic vessel.
1 and 2 show a StülZer-Wlek- lungs current transformer, the insertion insulator 5 of which is formed from the same cast resin as the remaining insulating part 4, which envelops the primary winding.
3 shows a bushing-winding current transformer which differs from the embodiment according to FIGS. 1 and 2 only in that it has two opposite lead-in insulators.
4 likewise shows a bushing-winding current transformer, the current supply and discharge lines of which are passed through capacitor bushings immersed in the synthetic resin, that is to say through insulators of a known type, which have conductive capacitor coatings 7 lying coaxially with the current conductor included to control your dielectric stress.
Two separate iron cores are assumed, but the design does not change if a jacket core is used as in Fig. 3. Investigations have shown that with contact resins along the contact layer with the bushings a similar high electrical level Strength is achieved as with the usual liquid insulating materials.
This type of embodiment is suitable when, with the embodiment according to FIG. 2, sliding discharges along the guide insulators can no longer be avoided because of excessive voltage levels. In an analogous manner, the current transformer according to FIGS. 1 and 2 can be provided with a condenser bushing.
5 shows a suspension winding current transformer which can be suspended by means of the eyelet 8. The power supply connections are at 9 and 10. The lead-in insulator 5 is protected against the weather with ceramic shields 7 here.
6 shows a bushing single-rod transducer. The rod 2 plays the role of the primary winding. The synthetic resin body 4 can also completely envelop the iron core with its secondary winding.
7 shows a low-voltage winding current transformer with a jacket core. Here, the synthetic resin body primarily has the task of securing against the electro-dynamic forces. As indicated by dotted lines in the drawing, it can take the form of a support body for the current transformer.
8 shows a low-voltage single-line current transformer.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH262655T | 1947-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH262655A true CH262655A (en) | 1949-07-15 |
Family
ID=4474467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH262655D CH262655A (en) | 1947-05-12 | 1947-05-12 | Dry current transformer. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH262655A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE970277C (en) * | 1955-01-23 | 1958-09-04 | Vacuumschmelze Ag | Method for solidifying toroidal cores, in particular toroidal tape cores, for protection against mechanical stresses |
DE970962C (en) * | 1950-12-02 | 1958-11-20 | Siemens Ag | Process for the production of windings permeated with a solid dielectric without voids |
DE1047302B (en) * | 1953-10-24 | 1958-12-24 | Koch & Sterzel Kommanditgesell | Method for manufacturing a transformer, in particular a measuring transducer |
DE972467C (en) * | 1950-10-06 | 1959-07-30 | Licentia Gmbh | Flameproof enclosed dry-type transformer for companies at risk of explosion and firedamp |
DE1088563B (en) * | 1958-02-12 | 1960-09-08 | Siemens Ag | Arrangement with at least two components isolated from one another by casting resin with different potentials, e.g. B. for transducers |
DE1091224B (en) * | 1957-04-26 | 1960-10-20 | Licentia Gmbh | Method for manufacturing a conversion current transformer with a cut ribbon core |
DE1112578B (en) * | 1952-01-30 | 1961-08-10 | Siemens Ag | Method for producing an electrical winding arrangement with a casing from a castable, thermosetting plastic compound |
DE975347C (en) * | 1953-07-23 | 1961-11-09 | Licentia Gmbh | Method of isolating coil windings |
DE1124596B (en) * | 1952-03-24 | 1962-03-01 | Siemens Ag | Application of the method for producing an electrical winding of a measuring transducer with a casing made of a castable plastic compound |
DE1147682B (en) * | 1959-02-13 | 1963-04-25 | Koch & Sterzel Kommanditgesell | Cast-resin-insulated bushing winding current transformer |
DE976311C (en) * | 1953-12-24 | 1963-06-27 | Licentia Gmbh | Coil fastening for electrical vibrators |
DE1151844B (en) * | 1954-11-22 | 1963-07-25 | Licentia Gmbh | Process for the production of a nozzle body made of thermoplastic material and having a screen ring for pressure gas switches |
DE1161969B (en) * | 1958-09-04 | 1964-01-30 | Joseph Waldman & Sons | Arrangement for sealing electrical conductors in a head part |
DE1172329B (en) * | 1954-11-17 | 1964-06-18 | Philips Nv | Electrical device with an elastic, organic insulation embedding |
DE1180055B (en) * | 1951-05-08 | 1964-10-22 | Messwandler Bau Gmbh | Dry converter unit made up of voltage and current transformers in a through-guide design |
US3222625A (en) * | 1960-12-29 | 1965-12-07 | Acec | Resinous-type terminal-bushing construction with encapsulated current transformer |
-
1947
- 1947-05-12 CH CH262655D patent/CH262655A/en unknown
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE972467C (en) * | 1950-10-06 | 1959-07-30 | Licentia Gmbh | Flameproof enclosed dry-type transformer for companies at risk of explosion and firedamp |
DE970962C (en) * | 1950-12-02 | 1958-11-20 | Siemens Ag | Process for the production of windings permeated with a solid dielectric without voids |
DE1180055B (en) * | 1951-05-08 | 1964-10-22 | Messwandler Bau Gmbh | Dry converter unit made up of voltage and current transformers in a through-guide design |
DE1112578B (en) * | 1952-01-30 | 1961-08-10 | Siemens Ag | Method for producing an electrical winding arrangement with a casing from a castable, thermosetting plastic compound |
DE1124596B (en) * | 1952-03-24 | 1962-03-01 | Siemens Ag | Application of the method for producing an electrical winding of a measuring transducer with a casing made of a castable plastic compound |
DE975347C (en) * | 1953-07-23 | 1961-11-09 | Licentia Gmbh | Method of isolating coil windings |
DE1047302B (en) * | 1953-10-24 | 1958-12-24 | Koch & Sterzel Kommanditgesell | Method for manufacturing a transformer, in particular a measuring transducer |
DE976311C (en) * | 1953-12-24 | 1963-06-27 | Licentia Gmbh | Coil fastening for electrical vibrators |
DE1172329B (en) * | 1954-11-17 | 1964-06-18 | Philips Nv | Electrical device with an elastic, organic insulation embedding |
DE1151844B (en) * | 1954-11-22 | 1963-07-25 | Licentia Gmbh | Process for the production of a nozzle body made of thermoplastic material and having a screen ring for pressure gas switches |
DE970277C (en) * | 1955-01-23 | 1958-09-04 | Vacuumschmelze Ag | Method for solidifying toroidal cores, in particular toroidal tape cores, for protection against mechanical stresses |
DE1091224B (en) * | 1957-04-26 | 1960-10-20 | Licentia Gmbh | Method for manufacturing a conversion current transformer with a cut ribbon core |
DE1088563B (en) * | 1958-02-12 | 1960-09-08 | Siemens Ag | Arrangement with at least two components isolated from one another by casting resin with different potentials, e.g. B. for transducers |
DE1161969B (en) * | 1958-09-04 | 1964-01-30 | Joseph Waldman & Sons | Arrangement for sealing electrical conductors in a head part |
DE1147682B (en) * | 1959-02-13 | 1963-04-25 | Koch & Sterzel Kommanditgesell | Cast-resin-insulated bushing winding current transformer |
US3222625A (en) * | 1960-12-29 | 1965-12-07 | Acec | Resinous-type terminal-bushing construction with encapsulated current transformer |
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