AT159064B

AT159064B - High frequency current transformer.

Info

Publication number: AT159064B
Authority: AT
Original assignee: Lorenz C Ag
Priority date: 1936-02-18
Filing date: 1937-02-15
Publication date: 1940-07-10

Description

  

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    1101'hfre quenzstromwandler.   



   Es ist bekannt, bei Hochfrequenzstrommessungen Stromwandler zu verwenden, wenn die Ablesestellen und die Messstellen nicht die gleichen sind. Ein anderer Grund für die Verwendung von Stromwandlern ist, dass die Raumkapazität der benutzten Instrumente zu gross ist, wenn sie unmittelbar in die Leitung geschaltet sind. Die Raumkapazitäten der Stromwandler dagegen lassen sich wesentlich kleiner machen. 



   Die Erfindung schlägt vor, Hochfrequenzstromwandler mit Kernen aus   HocMrequenzeisen   zu versehen. 



   Unter bestimmten Voraussetzungen ist   das Übersetzungsverhältnis gleich   dem Verhältnis der Windungszahlen. Solche Voraussetzungen sind kleine Streuung und kleine Wattleistung. 



   In Vorrichtungen gemäss der Erfindung werden die räumlichen Abmessungen und daher die Raumkapazitäten sowie die Streuung dadurch verringert, dass die Sekundärwicklung mit einem Hochfrequenzeisenkern versehen wird. 



   Im folgenden ist die neue Anordnung an einem Beispiel erläutert. I bezeichnet den Primärleiter, der z. B. ein Rohr sein kann, II die Toroidspule, die zufolge Fig. 1 mit einem Hochfrequenzeiseifkern Fe versehen ist. Die Spule II ist sorgfältig abgeschirmt. Die hiezu dienende Abschirmung A ist so beschaffen, dass keine Kurzsehlusswindung entsteht. Die Abschrimung   A   hat hiefür an ihrem Umfange 
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    1101'hfre frequency current transformer.



   It is known to use current transformers for high-frequency current measurements if the reading points and the measuring points are not the same. Another reason for using current transformers is that the space capacity of the instruments used is too large if they are connected directly to the line. The space capacities of the current transformers, on the other hand, can be made much smaller.



   The invention proposes providing high-frequency current converters with cores made of high-frequency iron.



   Under certain conditions, the transmission ratio is equal to the ratio of the number of turns. Such requirements are small dispersion and small wattage.



   In devices according to the invention, the spatial dimensions and therefore the spatial capacities as well as the scatter are reduced in that the secondary winding is provided with a high-frequency iron core.



   The new arrangement is explained below using an example. I denotes the primary conductor, the z. B. can be a tube, II the toroidal coil, which is provided according to Fig. 1 with a high frequency iron core Fe. The coil II is carefully shielded. The screen A used for this is such that no short-circuit turns are created. The shielding A has for this purpose on its circumference
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Claims

PATENT CLAIMS: 1. High-frequency current transformer, characterized in that an insulating body is carried by the conductor acting as the primary winding, on which an annular core made of high-frequency iron and provided with a secondary winding is arranged, and that the secondary winding is surrounded on all sides with a shield which is at one point of the cross section is interrupted.

2. Current transformer according to claim 1, characterized in that symmetrical dielectrics of different dielectric constants are present between the primary conductor or the primary conductors and the secondary winding. EMI2.1 of the dielectrics behave inversely to their dielectric constants.

4. Current transformer according to claims 1 to 3; characterized in that an insulating tube, for. B. made of ceramic material, which forms one of the dielectrics.

5. Current transformer according to claims 1 to 4; characterized in that the inner surface of the insulating tube is metallized.

6. Current transformer according to claims 1 to 5, characterized in that the secondary EMI2.2 is attached.

7. Current transformer according to claims 1 to 6, characterized in that parts of the high-frequency iron core are designed to be mutually displaceable to change the transmission ratio.

8.'Stromwandler according to claims 1 to 6, characterized in that parts of the secondary winding are designed to change the transmission ratio against each other.

9. Current transformer according to claims 1 to 6, characterized in that the secondary winding is connected in parallel with a voltage limiter which actuates a signal in the event of a line break. EMI2.3