JPH0311877Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a split-type current transformer (including a zero-phase current transformer).

In a conventional split type current transformer, as shown in the first diagram, one of the cores 1 and 2 of a pair of split cores 1 and 2 is
The secondary coil 3 is wound around a pair of split iron cores 1 and 2, respectively, as shown in FIGS. It is connected by crossover wires 5 and 6, but the former is often influenced by external magnetic fields, so it is only used as a current transformer for visual purposes, and is not suitable for high-precision current transformers or The latter type is often used in zero-phase current transformers.

In this latter split type current transformer, if the split cores 1 and 2 are opened and closed several times, the crossover wires 5 and 6 may break. Further, a shorting bar is attached to the exterior of the current transformer, and the divided coils 3 and 4 are connected by the shorting bar, but this is dangerous because the shorting bar, that is, the metal part is exposed to the outside of the current transformer. Further, there are problems such as an increase in the number of parts, a complicated structure, and a corresponding increase in price.

The present invention aims to provide a split type current transformer that can solve the above-mentioned conventional problems.

An embodiment of the present invention will be described below based on FIGS. 4 to 6 of the drawings. Reference numerals 7 and 8 represent a split core of a split type current transformer, and a plurality of plate pieces 9 and 10 formed from a core material such as permalloy are used. The sheets are laminated one by one and have abutting end portions 11 and 12 that abut against each other so that they are alternately overlapped at both ends. 13 and 14 are insulating plates molded in the same shape as the plate pieces 9 and 10, respectively, and the plural plate pieces 9 and 10 are laminated as described above.
The insulating plate 13 separates the divided core 7 into divided cores 7A and 7B, and the insulating plate 14 divides the divided core 8 into divided cores 8A and 8B. A secondary coil 15 is wound around the divided core 7, and one end 16 is soldered to the divided core 7A, and the other end 17 is soldered to the divided core 7B. 18 is a secondary coil wound around the divided core 8, and one end 19 is connected to the divided core 8A.
and solder the other end 20 to the segmented iron core 8B.
It is soldered to. 21 is a burden resistor connected between lead wires drawn out from a part of the secondary coil 17.

In this invention, as described above, a pair of split cores is made by laminating a plurality of plate pieces formed from core material, and an insulating material such as an insulating plate is interposed between each of these laminated plate pieces. , is configured to have a segmented core divided by each of the insulating materials, and one end of a secondary coil wound around one segmented core of the pair of segmented cores is connected to one segmented core, The other end is connected to the other segmented core, one end of the secondary coil wound around the other segmented core is connected to one segmented core, and the other end is connected to the other segmented core. Therefore, the primary and secondary coils are connected by a segmented core, eliminating the need for crossover wires in conventional products. In addition, with conventional products that use shorting bars, it is necessary to process the terminals of the secondary coil and leader wire in four places, but with the product of this invention, only two leader wires are required, and the secondary coil and leader wire are Since terminal processing only needs to be done in one place, there are fewer parts, the structure is simpler, the price is lower, and metal parts such as shorting bars are not exposed to the outside, making it safer. It has the following advantages.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the conventional product, Fig. 2 is a front view showing another example of the conventional product, Fig. 3 is a top view of Fig. 2, and Figs. 4 to 6 are the front view of the conventional product. One embodiment is shown, and FIG. 4 is a front view, FIG. 5 is a top view of FIG. 4, and FIG. 6 is a bottom view. 7, 8...Split core, 7A, 7B, 8A, 8B
...Segmented iron core, 9,10...Plate piece, 13,14...
...Insulating plate, 15...Secondary coil, 16...One end of secondary coil 15, 17...Secondary coil 15
18...secondary coil, 19...one end of the secondary coil 18, 20...the other end of the secondary coil 18.

Claims (1)

[Scope of utility model registration request] A pair of split cores is made by laminating a plurality of plate pieces made of core material, with an insulating material interposed between each of the laminated plate pieces, and sections divided by each insulating material. The secondary coil is configured to have an iron core, and one end of a secondary coil wound around one of the pair of split cores is connected to one segment core, and the other end is connected to the other segment core. A split type current transformer in which one end of a secondary coil wound around the other split core is connected to one segment core, and the other end is connected to the other segment core.