DE970574C - Device for improving the error curves or for fine adjustment of current transformers - Google Patents
Device for improving the error curves or for fine adjustment of current transformersInfo
- Publication number
- DE970574C DE970574C DES2939D DES0002939D DE970574C DE 970574 C DE970574 C DE 970574C DE S2939 D DES2939 D DE S2939D DE S0002939 D DES0002939 D DE S0002939D DE 970574 C DE970574 C DE 970574C
- Authority
- DE
- Germany
- Prior art keywords
- secondary winding
- current transformers
- fine adjustment
- improving
- current branches
- 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
Links
Classifications
-
- 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
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
- H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
- H01F27/427—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for current transformers
-
- 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
Es sind Vorrichtungen zur Verbesserung .der Fehlerkurven bzw. zur Feineinstellung der Stromwandler bekannt, bei denen der Eisenkern des Wandlers wenigstens teilweise in parallele Einzelpfade aufgeteilt ist. Auch ist ein Wandler bekamitgeworden, bei dem die Sekundärwicklung in zwei auf dem gleichen Kern liegende parallel geschaltete Zweige mit etwas ungleicher Windungszahl aufgeteilt ist. Der Nachteil dieser Anordnung liegt vor allem darin, daß eine wesentlich größere Windungszahl und damit erhöhter Wicklungsraum benötigt wird. Weiterhin hat man vorgeschlagen, einen Teil der Sekundärwicklung nur aufzuteilen. Bei dieser Anordnung fehlt gleichfalls die Aufteilung des Eisenkerns in parallele Einzelpfade, und der aufgeteilte Teil der Sekundärwicklung benötigt noch einen verhältnismäßig großen Wicklungsraum. Eine weitere Anordnung sieht zwei Eisenkerne mit einer in zwei Stromzweige unterteilten Sekundärwicklung vor. Auch hier macht sich der verhältnismäßig große Aufwand von Kupfer und Isoliermaterial unangenehm bemerkbar. Ferner hat man noch vorgeschlagen, die Sekundärwicklung gegen das Ende zu unterteilen. Aber auch hier hat man die gesamte Wicklung auf einem nicht unterteilten Eisenkern angeordnet. Diese Anordnung wird noch weiter dadurch kompliziert, daß zu einem Teil der Sekundärwicklung ein aus Widerstand bestehender Stromverteiler parallel geschaltet ist.There are devices to improve the error curves or to Fine adjustment of the current transformer known, in which the iron core of the transformer at least is partially divided into parallel individual paths. A converter has also been received, in which the secondary winding is connected in parallel in two lying on the same core Branches with a slightly unequal number of turns is divided. The disadvantage of this arrangement lies mainly in the fact that a significantly larger number of turns and thus increased Winding space is required. It has also been proposed to use part of the secondary winding just split up. The division of the iron core is also missing in this arrangement in parallel individual paths, and the split part of the secondary winding is required still a relatively large winding space. Another arrangement sees two Iron cores with a secondary winding divided into two branches. Even this is where the relatively large expenditure of copper and insulating material comes into play uncomfortably noticeable. It has also been proposed to counter the secondary winding to divide the end. But even here you don't have the entire winding on you divided iron core arranged. This arrangement is further complicated by that to a part of the secondary winding a current distributor consisting of a resistor is connected in parallel.
Demgegenüber betrifft die vorliegende Erfindung eine besonders vorteilhafte Kombination, mit der eine wirksame Abgleichung des Wandlers und eine Verbesserung der Fehlerkurven -sicher erreichbar ist.In contrast, the present invention relates to a particularly advantageous one Combination with which an effective adjustment of the converter and an improvement the error curve can be safely reached.
Bei einer Vorrichtung zur Verbesserung der Fehlerkurve bzw. zur Feineinstellung des Stromwandlers ist erfindungsgemäß sowohl der Eisenkern des Wandlers in parallele Einzelpfade aufgeteilt als auch die Sekundärwicklung gegen das Ende zu in an sich bekannter Weise in zwei Stromzweige aufgespaltet, die in verschiedener, gegebenenfalls veränderbarer Weise mit diesen Eisenpfaden verkettet und an den Enden miteinander verbunden sind. Durch Änderung dieser Verkettung läßt sich die Krümmung der Fehlerkurve des Wandlers leicht in dem einen oder anderen Sinne beeinflussen, und es macht bei gegebenem Wandlertyp keine Schwierigkeiten, durch .einige Probemessungen jeweils die günstigste Verkettung zu ermitteln. Am besten macht man den Anschlußleiter für den verzweigten Teil der Sekundärwicklung längs .des durch die beiden Zweige gebildeten Leitungsringes verschiebbar. Durch diese Maßnahme läßt sich sowohl das Übersetzungsverhältnis sehr genau einstellen als auch die Fehlerkurve verbessern, falls die Einstellung des Übersetzungsverhältnisses durch andere Mittel vorgenommen wird. Es empfiehlt sich, den leiden Stromzweigen der Sekundärwicklung Widar::tände mit verschiedenen Temperaturkoeffizienten elektrischer Leitfähigkeit zu geben. Durch diese Maßnahme können nicht nur Temperaturfehler des Zählers, sondern auch ungünstige Eigenschaften des Eisenkernes ausgeglichen werden. Die einzelnen Eisenkernteile können aus Material mit verschiedener Charakteristik bestehen, so daß man durch Änderung der Verkettung bzw. des Anschlußpunktes in beliebigem Feinheitsgrade von der einen auf die andere Charakteristik übergehen kann, zum Zweck, die günstigste Form für die Fehlerkurve bzw. das richtige Übersetzungsverhältnis herzustellen.In a device for improving the error curve or for fine adjustment of the current transformer is according to the invention both the iron core of the transformer in parallel Divided individual paths as well as the secondary winding towards the end in itself known way split into two branches, which in different, optionally changeably linked with these iron paths and with each other at the ends are connected. The curvature of the error curve can be changed by changing this linkage of the transducer easily influence in one sense or another, and it makes at Given the type of transducer, no difficulties due to a few test measurements to determine the most favorable concatenation. It is best to make the connection conductor for the branched part of the secondary winding along .des formed by the two branches Line ring displaceable. Through this measure, both the transmission ratio set very precisely as well as improve the error curve, if the setting the gear ratio is made by other means. It recommends itself, the branches of the secondary winding suffer from resistance with different To give temperature coefficients of electrical conductivity. By this measure can not only cause temperature errors of the meter, but also unfavorable properties of the iron core are compensated. The individual iron core parts can be made of material exist with different characteristics, so that by changing the concatenation or the connection point in any degree of fineness from one to the other Characteristic can pass over, for the purpose, the most favorable form for the error curve or to establish the correct transmission ratio.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES2939D DE970574C (en) | 1938-07-05 | 1938-07-05 | Device for improving the error curves or for fine adjustment of current transformers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES2939D DE970574C (en) | 1938-07-05 | 1938-07-05 | Device for improving the error curves or for fine adjustment of current transformers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE970574C true DE970574C (en) | 1958-10-02 |
Family
ID=7469872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES2939D Expired DE970574C (en) | 1938-07-05 | 1938-07-05 | Device for improving the error curves or for fine adjustment of current transformers |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE970574C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0157881A1 (en) * | 1983-09-13 | 1985-10-16 | Mitsubishi Denki Kabushiki Kaisha | Current detecting circuit |
EP0536258A1 (en) * | 1990-06-25 | 1993-04-14 | Cooper Ind Inc | Faulted circuit detector having isolated indicator. |
US5475371A (en) * | 1990-06-25 | 1995-12-12 | Cooper Industries, Inc. | Faulted circuit detector having isolated indicator |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH70878A (en) * | 1915-03-06 | 1916-07-17 | Frederic Guillierme | Blasthole digging machine |
DE626679C (en) * | 1929-08-28 | 1936-02-29 | Siemens Schuckertwerke Akt Ges | Transformer with turns that are not linked to the entire magnetic flux |
DE647854C (en) * | 1933-06-14 | 1937-07-17 | Aeg | Circuit for fine adjustment of the transmission ratio of current transformers using two cores with two primary and secondary windings connected in series |
DE658954C (en) * | 1931-03-29 | 1938-04-19 | Koch & Sterzel Akt Ges | Arrangement for the one-time setting of a desired current translation ratio for measuring current transformers |
-
1938
- 1938-07-05 DE DES2939D patent/DE970574C/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH70878A (en) * | 1915-03-06 | 1916-07-17 | Frederic Guillierme | Blasthole digging machine |
DE626679C (en) * | 1929-08-28 | 1936-02-29 | Siemens Schuckertwerke Akt Ges | Transformer with turns that are not linked to the entire magnetic flux |
DE658954C (en) * | 1931-03-29 | 1938-04-19 | Koch & Sterzel Akt Ges | Arrangement for the one-time setting of a desired current translation ratio for measuring current transformers |
DE647854C (en) * | 1933-06-14 | 1937-07-17 | Aeg | Circuit for fine adjustment of the transmission ratio of current transformers using two cores with two primary and secondary windings connected in series |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0157881A1 (en) * | 1983-09-13 | 1985-10-16 | Mitsubishi Denki Kabushiki Kaisha | Current detecting circuit |
EP0157881A4 (en) * | 1983-09-13 | 1986-02-13 | Mitsubishi Electric Corp | Current detecting circuit. |
EP0536258A1 (en) * | 1990-06-25 | 1993-04-14 | Cooper Ind Inc | Faulted circuit detector having isolated indicator. |
EP0536258A4 (en) * | 1990-06-25 | 1993-10-06 | Cooper Industries Inc. | Faulted circuit detector having isolated indicator |
US5475371A (en) * | 1990-06-25 | 1995-12-12 | Cooper Industries, Inc. | Faulted circuit detector having isolated indicator |
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