DE1170531C2 - Cascade current transformers with split insulator and several cores of different accuracy - Google Patents

Description

³ - ^: · ■ ■ ·. ■ ⁴ '"■ ■ ■

stem of a core of this stage arranged with inclined secondary windings, which together with

the core parts, in order to cover the material costs required for the corresponding test voltage

and to make the external dimensions favorable. Isolation 3 are provided. As a conclusion, the

In the current transformer according to the invention, the insulation 3 is the conductive coating 4.

The advantage achieved is that the diameter of the earth-5 In the earth-side stage are two decoupled. side stage surrounding insulator is determined, for example, only by the measuring systems with the space requirement of the primary winding rotated by 90 °. These primary windings 5 and 6 and the associated arrangement make it possible, even with staggered arrangement iron cores 7 a / 7 b and 8, which carry secondary windings, not shown, of the cores of different accuracy. To achieve in the space-saving structure, since z. B. in the embodiment shown, only the upper core using a leg core as the lower core is divided into two identical core parts 7a and 7b , which are arranged to accommodate the partial cores of the system above at such a large angle to the vertical axis within the insulator that it does not extend its diameter in the radial direction through the projection of the leg more than the primary winding 5 with the isokernes and its primary winding is given. .15 lation 9 or the core 8 and the primary winding 6

In Fig. 1 is to explain the invention with the insulation 10. This is from the other

as an exemplary embodiment, a schematic representation of a current view is shown in FIG. 2 can be seen,

converter shown in two-stage construction, which in You can also incline the core 8 and

the earth-side stage two decoupled measuring systems thus further reduce the overall height,

having. In the high-voltage-side stage the protection is only given for the totality of the characteristics

Primary conductor 1 and the two cores 2 with their claims of the claim.

1 sheet of drawings

Claims (1)

1 , "^;'' .. V 2 ■ ■■" ■ '■' ■ ■ ■ ' Stage existing cores into two equal core parts Claim: divided, is that as a result of inclination over the The extent of their primary winding or the projection Current transformers in cascade design with part of the other core in this cascade stage are not different insulator and several cores protrude. Licher accuracy, in which each core is the earth- In the current transformer according to the invention side stage of the cascade is assigned a primary by arranging the feed lines to the cores of the winding, characterized by the identification earth-side stage in a common implementation that the earth-side feed lines in the earth-side stage and by arranging the cores on top of each other of the earthed feed lines to the cores this stage io-sided stage the expenditure on insulation material of the cascade in a common voltage _: .. relatively low. controlled implementation relocated and only after; , From .the documents laid out by the German their exit from the voltage-controlled patent application S 24724 VIII c / 21 e is a grain area the bushing separated from the current and voltage transformers in the cascade earth side Step; ^ existing cores <further construction known, in which the current transformer is multiple are, which contains rere measuring systems with the associated windings. The leads to the one above the other and to avoid mutual cores of the current transformer in the earth-side stage Core influencing pn would have to be separate in the case of magnetic decoupling stood from each other, ·, are arranged, ■ and that bushings are accommodated; also are at least one of the cores present in the earth-side step, the cores in the individual steps of the face wall Cores%> two identical core parts usually arranged next to one another. A core division in is divided, the inclined position over the reverse of the earth-side step is not made. from start of their primary winding or the projection of this known transducer is different of the other core in this cascade stage, the current transformer according to the invention does not protrude above all. 25 afar, than through a joint implementation and Arranging the cores one above the other while restricting the need for insulating material creates a slimline The design is created by inclining the core parts, a split core in the Kas-30 on the ground side caden level is favored. The invention relates to a current transformer in Kas- Furthermore is from the German patent 533 273 Kadenbauweise with split isolator and several known a transducer set, which is Cores of different accuracy, each one consisting of a current transformer and a voltage core the earth-side stage of the cascade one each. transducer existing measuring group, in which Primary winding is assigned. 35 the current transformer with its horizontally arranged From the journal ETZ-A, 1954, p. 308, a neth core is arranged above the voltage transformer with such a cascade current transformer in a multi-core design with a vertically lying core. This approach is known, in which a complete metrological order has been chosen to convert two oil-free measurement independence of the various measuring circuits to a transducer set under the fact that in each stage of the cascade 40 pushing for the smallest possible space to single-core current transformer in a number are intended to be summarized. This results in an arrangement that corresponds to the number of independent measuring 'in which the cores of both transducers in spite of narrow wake circuits; the secondary windings of the cash are magnetically decoupled.
Cores of the upper stage are connected to the respective case of a voltage converter (German patent Primary windings of the cores of the earth-side stage 45 writing 949168) it is also known to have a core in connected to the cascade. to split two equal, rectangular core parts in order to This known cascade current transformer can be used to save space. just said that he made a significant effort to It is already a pre-active cascade current transformer Material required. A structural design ...;> been beaten (German Patent 1139 201), tang is not described there, in particular 5 ° are missing in which the individual cores of the top tier with their Details of how to convert such a current transformer to secondary windings by converting them together Required space and slim construction, enveloping insulation from which they jointly cover part of the whole could shape. the primary winding are separated and in which the The invention is based on the object of isolating itself into a drainage of all seconds To design the current transformer in such a way that a bushing containing 55 core windings continues, particularly slim design of the earth-side stage while the individual cores of the earth-side stage are more than achieved will. According to the invention, this task is contiguous; There are, however, two through-holes solved that the led in the earth-side step wrestled next to each other between the earth-side cores Supply lines to the cores at this stage of the NEN, one of which contains the supply line to the primary cascade in a common voltage controlled 60 winding of the lower core, and the other the Passage relocated and only after its exit secondary discharge of the upper core. At least from the voltage-controlled area the through one of the two earth-side cores can through two Separate guidance to which cores are replaced in the earth-side stage. Proposed by this existing cores are continued, which gives way to the cascade current transformer according to the invention Associated windings on top of each other and to the 65 current transformers in cascade design insofar as avoidance of mutual core influences in one he special constructive features, such as a corresponding one A common leadthrough for those in the earth-side is arranged at a distance from one another, and that at least one of the supply lines in the earth-side step and a division at least