DE2510806C3

DE2510806C3 - Arrangement for the compensation of the low load voltage error of induction meters

Info

Publication number: DE2510806C3
Application number: DE19752510806
Authority: DE
Inventors: Günther Dipl.-Phys.; Laue Werner Dipl.-Ing.; Schreiner Heinz; 8500 Nürnberg Vieweg
Original assignee: Siemens AG
Current assignee: Siemens AG
Filing date: 1975-03-12
Publication date: 1977-12-22

Description

ket 8 dient nicht nur zur Bildung des für die Überverschiebung (90° Verschiebung) benötigten Nebenflusses, sondern auch gleichzeitig zur Spannungsfehlerkompensation. Die Kompensationswirkung für den Spannungsfehler wird durch entsprechende Bemessung der Stärke und Anzahl der Lamellen bestimmt. Zum Zwecke der Spannungsfehlerkompensation ist das Eisenpaket 8 in der Regel schwach gesättigt.ket 8 is not only used to create the tributary required for the over-displacement (90 ° displacement), but also at the same time for voltage error compensation. The compensation effect for the tension error is determined by appropriate dimensioning of the thickness and number of the lamellas. For the purpose of voltage error compensation, the iron package 8 is generally weakly saturated.

Es hat sich jedoch gezeigt, daß bei gröberen SpannungsSnderungen, wie dies beispielsweise bei Zählern mit zwei Nennspannungen unumgänglich der Fall ist, sich die Spannungsabhängigkeit zu stark ändert. Um auch diese berücksichtigen zu können, haben folgende Überlegungen zur erfindungsgemäßen Lösung geführt.However, it has been shown that with coarser voltage changes, such as for example with Meters with two nominal voltages is inevitable, the voltage dependency changes too much. In order to be able to take these into account as well, the following considerations have to do with the solution according to the invention guided.

Der Spannungsfehler Fu von Induktionszählern setzt sich zusammen aus dem negativen Spannungsdämpfungsfehler Fyo und dem Fehler Ful, der durch das positive Leertriebsmoment für Reibung;.- und Permeabilitätsausgleich entsteht.The voltage error Fu of induction meters is made up of the negative voltage damping error Fyo and the error Ful, which arises from the positive idle drive torque for friction and permeability compensation.

Der Spannungsdämpfungsfehler Fud wird bekanntlich durch den SpannungstriebfluÖ hervorgerufen. Er ändert sich mit dem Quadrat des SpannungstriebflussesThe voltage damping error Fud is known to be caused by the voltage drive flow. It changes with the square of the voltage drive flux

F₁₁D--C₂- LP, F ₁₁ D - C ₂ - LP,

wobei Ci eine Konstante und LJ die Zählerspannung bedeutet. Das hat zur Folge, daß der Zähler bei höherer Spannung langsamer läuft, als es theoretisch richtig wäre; er zeigt also Minusfehler. Bei niedrigerer Spannung liegen die Verhältnisse umgekehrt. Durch entsprechende Bemessung des magnetischen Nebenflusses des Eisenpaketes 8 kann der Einfluß der Spannungsdämpfung ausgeglichen werden. In Fig. 1 wird dies durch schwache Sättigung der beiden mit Φν ι und Φ/ν 2 bezeichneten Magnetkreise kompensiert, indem z. B. der Triebfluß Φι/rdurch starke Sättigung der Φ^-Kreise bei steigender Spannung U stärker als proportional ansteigt.where Ci is a constant and LJ is the counter voltage. The consequence of this is that the counter runs slower at a higher voltage than would theoretically be correct; so he shows minus errors. At a lower voltage, the situation is reversed. The influence of the voltage damping can be compensated for by appropriate dimensioning of the magnetic secondary flux of the iron core 8. In Fig. 1 this is compensated for by weak saturation of the two magnetic circuits denoted by Φν ι and Φ / ν 2 by z. B. the drive flow Φι / r by strong saturation of the Φ ^ circles with increasing voltage U increases more than proportionally.

Der zweite durch dei. spannungsabhängigen Spannungsleenrieb verursachte Anteil des SpannungsfehlersThe second by dei. tension-dependent tension drive caused part of the voltage error

C₁ ■ U C ₁ ■ U

I ■ IX)S Ii I ■ IX) S Ii

wobei Ci eine Konstante, /der Zählerstrom und ψ der Winkel zwischen / und LJ ist, ist wegen seiner Lastitbhängigkeit besonders bei Klcinlast von normalen Zählern und bei den beiden Nennspannungen von Zweispannungszählern die Ursache dafür, daß die Spannungsfehler groß sind gegenüber den Fehlern bei großer Last. F i g. 2 zeigt die Abhängigkeil des Spannungsfehlers Fei. von der Spannung LJ. where Ci is a constant, / is the meter current and ψ is the angle between / and LJ , is the reason that the voltage errors are large compared to the errors with a heavy load due to its load dependency, especially with the load of normal meters and with the two nominal voltages of two-voltage meters . F i g. 2 shows the dependent wedge of the voltage error Fei. from the voltage LJ.

Dieser Mangel wird bei der vorgeschlagenen Lösung dadurch behoben, daß man die beiden Magnetkreise von Φ ,ν ι und Φ.Μ2 durch unterschiedliche, unmagnetische Beilagen 10a und 106 definiert ungleich macht. Dabei wird die Spannungsabhängigkeit des Fehleranteils Ful, die bei gleichen Beilagen linear verläuft, wie Fig.2 zeigt, so geändert, daß eine Fehlerkurve Ful entsteht, die mit steigender Spannung weniger als linear steigt und im interessierenden Spannungsbereich von 0,8 L/nd'is 1,2 Un konstant ist, wie durch die gestrichelte Kurve in F i g. 2 dargestellt ist. Diese Wirkung vird von dem stark spannungsabhängigen Fehleranteil Fui.k erzeugt, der durch das negative Leertriebsmoment hervorgerufen wird und der durch eine strichpunktierte Linie in F i g. 2 angedeutet ist. Das Leertriebsmoment entsteht durch die ungleiche Sättigung der Magnetkreise Φ si iund$N2.This deficiency is remedied in the proposed solution by making the two magnetic circuits of Φ, ν ι and Φ.Μ2 defined unequal by different, non-magnetic enclosures 10a and 106. Here, the voltage dependence of the error component Ful which runs linearly with the same supplements, as Figure 2 shows, is changed so that an error curve arises Ful that is less than linear increases with increasing voltage and in the relevant voltage range of 0.8 L / nd ' is 1.2 Un is constant, as indicated by the dashed curve in FIG. 2 is shown. This effect is generated by the strongly voltage-dependent error component Fui.k , which is caused by the negative idle drive torque and which is indicated by a dash-dotted line in FIG. 2 is indicated. The idle drive torque is caused by the unequal saturation of the magnetic circuits Φ si i and $ N2.

Der Fchleranteil Fulk läßt sich durch den Unterschied der Stärk« der Beilagen 10a und 10b so steuern, daß die Spannungsabhängigxeit bei Kleinlast für normale Zähler und bei den beiden Nennspannungen vom Zwei^c~T.-tungszähler optimal klein ist. Es hat sich gezeigt, oß die unterschiedliche Stärke zwischen 1 :1,2 bis 1,5 schwankt. In der Praxis schwankt die Stärke der Beilagen zwischen 1 und 1,5 mm.The Fchleranteil Fulk can be caused by the difference of starch "of side dishes 10a and 10b thus control that the Spannungsabhängigxeit at low load for normal counter and the two nominal voltages from two ^c ~ T. Maintenance counter optimally small. It has been shown that the different strengths fluctuate between 1: 1.2 to 1.5. In practice, the thickness of the inserts varies between 1 and 1.5 mm.

Hierzu 1 Blau ZeichnungenFor this 1 blue drawings

Claims

Patent claims:

1. Arrangement to compensate the small load. Voltage error of induction meters which have a> Have E-shaped tension iron, in which the two outer legs at their free ends in the have essentially the same distance from the center leg as in other places of their Length and the means to achieve a required for the over-displacement (90 ° displacement) Tributary and means for achieving a corresponding voltage compensation provided are, with the entire tributary required for the over-shifting via a laterally arranged Laminated, weakly saturated iron packet is directed and the for the correct Over-displacement required bypass air gaps on the outer legs of the tension iron lie, characterized in that the secondary flow air gaps on the outer legs (2) of the Tension iron (1) are sized differently.

2. Arrangement according to claim 1, characterized in that the air gaps of different strengths are formed by non-magnetic enclosures (10a, 106) of different sizes.

3. Arrangement according to claim 1, characterized in that the different tributary air gaps on the one hand by a non-magnetic disc and on the other hand by a Combination of a non-magnetic and a ferromagnetic disk are formed.

3535

4040

The invention relates to an arrangement for compensating for the low-load voltage error of Induction meters, which have an E-shaped tension iron, in which the two outer legs their free ends have essentially the same distance from the center leg as on others Establish their length and in the means of obtaining a tributary necessary for the over-displacement and means are provided for achieving a corresponding voltage compensation, the all of the tributary required for the over-displacement (90 ° displacement) via a side-mounted Laminated, weakly saturated iron packet is passed and which is responsible for the correct over-displacement necessary tributaries are on the outer legs of the tension iron. Such an arrangement became known through the DT-Gbm 19 68210. By dimensioning the iron package accordingly In this known arrangement, two conditions can be optimally met, namely for the purpose of Over-shift to lead a correspondingly high shunt flux and for voltage compensation to have a corresponding saturation.

The invention is based on the object of providing an arrangement of the type described at the outset improve that the differences between high load voltage errors and the voltage errors at Partial load can be fully compensated. In addition, the low-load voltage errors for the two voltages of meters with two different nominal voltages can be matched. To solve this problem, possible solutions are known such. B. a special design of the Empty drive setting means of a counter or the attachment a short-circuit winding on part of the tension iron. While the effect in the first case strongly depends on the position of the adjustment means, occurs in the second case when using a short-circuit winding an additional temperature dependency of the voltage errors between low load and high load of a normal meter or for the various voltages of a two-voltage meter.

According to the invention, this problem is solved in a counter of the type described at the outset in such a way that that the air gaps between the ends of the shunt iron package and the ends of the outer legs of the tension iron are dimensioned differently. This can be done in a simple manner in this way be that the known non-magnetic washers at the ends of the legs of the Tension iron and the tributary flap are dimensioned differently. Can have the same effect can be achieved if on one side a non-magnetic disc and on the other side a Combination of a non-magnetic and a ferromagnetic disc is used.

Based on the drawing, in which an exemplary embodiment is shown, the subject matter of the invention is explained in more detail. With 1 is an E-shaped tension iron denotes, in a manner known per se, together with one not shown in the drawing Electricity iron is on one level and forms the drive system of an electricity meter. Between Tension iron 1 and current iron are located on a carrier plate of the meter, also not shown. As the drawing shows, the two outside bars have! 2 of the tension iron 1 the same distance from a middle leg 3, so that a voltage coil, not shown in the drawing, is finished wound state can be applied to the middle leg 3. The tension iron 1 is in itself As is known, constructed from individual lamellae. To return the emerging from the middle leg 3 Flux, a yoke 4 made of magnetically conductive material is provided, which with the help of Screws 5 can be screwed into bores of the tensioning iron 1 on the two outer legs 2. A The bow-shaped part 6 is used to guide it around the central limb 3. One formed on the bow 4 Tongue 7 engages around the carrier plate and extends under the middle leg 3 and comes between the Legs of the current iron, not shown, to lie.

With a laminated iron package is referred to, which with the help of non-magnetic screws 9 and Discs 10a and 10Z> made of non-magnetic material attached to the outer legs 2 of the tensioning iron is By the washers 10, the tributary air gaps are formed on the outer legs, while by additional shims 11 made of ferromagnetic material, the iron package 8 directly on the Middle leg 3 rests A screw 12 is used to attach the iron package 8 to the middle leg! 3. On the underside of the iron package 8, a projection 13 adapted to the shape of the central leg 3 is punched, which serves to widen the pole. The laminated iron pa-