JPS59188908A - Current transformer - Google Patents

Abstract

PURPOSE:To form a current transformer in a small type and in light weight, to facilitate manufacturing work and to contrive to enhance quality of the current transformer by a method wherein the outside conductor of the straight line part of a primary coil is made to a semicircular arc type sectional shape, the ring part conductor is made to a rectangularly sectional shape, and the finished shape of main insulation is made to a veritably circular section. CONSTITUTION:The outside conductors 31, 32 of the two-way conductors 6, 7 of the straight line part 1 of a primary coil are made to semicircular arc type sections, the conductors thereof are assembled to form the section in a veritable ring shape, and size of the inside diameter of a bushing 16 can be reduced. Moreover the sectional area of an oil path 33 is increased to enable to attain enhancement of circulation of oil, and taping work of main insulation 15 is facilitated. Moreover, the sectional shape formed by assembling ring part conductors 34, 35 is formed in a true circle to enable to form a current transformer in a small type, and taping of main insulation 15 can be executed easily.

Description

[Detailed Description of the Invention] This invention relates to a current transformer, and more specifically, it has a plurality of current transformation ratios, the current transformation ratios are switched by changing the number of turns of the primary coil, and the current transformation ratio is changed by changing the number of turns of the primary coil. It concerns a current transformer equipped with an easy-to-understand method.

Conventionally, this type of current transformer is shown in FIGS. 1 and 2.

There was one shown in Figure 3. In the figure, the linear part l of the -order coil is the central tube conductor λ, 4! and an outer tubular conductor surrounding the central tubular conductor λ and the outer tubular conductor, 3. jt form reciprocating conductors 6 and 7. The central tubular conductor is covered with an insulating tube g, and the central tubular conductor is
A first roadway 9 is formed by the center hole of the groove. Second
The roadway/Q is the outer tubular conductor 3. ! and a central tubular conductor 1 and 2, each having an annular cross section. Reciprocating conductor 6, 7
Two ring-shaped tubular conductors /, 2, /, 7 are disposed at the bottom of the ring-shaped conductor /, 2, /, 7 and have a ring-shaped path //, one end of which is connected to the central tube conductor, and the other end of which is connected to the outer tubular conductor (3.). are connected to each other to form a primary coil. Ring part tubular conductor/2
A secondary coil It is wound around the iron core /7, which is interlinked with , /,7. - The main insulation of the reciprocating conductor B, 7 of the straight section of the next coil is the reciprocating conductor 6 as shown in Figure 2.
．． 7 are applied all at once, and the ring part has a tubular conductor/co L/3 as shown in Fig. 3.
A main insulation lS is provided collectively. /f is inter-coil insulation. Reference numeral 16 designates an insulator tube, and an upper tank 21 having a lead-in terminal 1, that is, a lead-out terminal 20, is disposed at the upper end of the insulator tube. is combined with

With the above configuration, the primary current flowing from the lead-in terminal 19 flows into the outer tubular conductor S of the reciprocating conductor 7, further passes through the ring tubular conductor /j, the center tubular conductor, and then flows to the outer tubular conductor 3 of the reciprocating conductor B. It flows in, passes through the ring tubular conductor 13, and flows out from the lead terminal -0 to the line. The heat generated in the primary coil at this time causes the oil to be sucked into the roadway 10 of No. 1 and circulated to the roadway 10 of the ring section and the first roadway 10, and the oil whose temperature has risen due to heat absorption is transferred to the upper tank 2/. It is cooled and sucked into the primary coil roadway 10 again, effectively controlling the temperature rise of the current transformer.

However, since the conventional primary switching current transformer is constructed using a tubular conductor as described above, the external cross section of the main insulation IS after taping is oval-shaped, and the linear portion l of the secondary coil is The inner diameter of the insulator tube/6 that surrounds the reciprocating conductors 6 and 7 needs to be large enough to correspond to the long side of the oval shape,
The insulator/l becomes large and heavy,
It was uneconomical. In addition, the taping work for forming the main insulation lj has disadvantages such as poor workability because the shape of the coil is not a perfect circle, and furthermore, it is difficult to control the dimensions, resulting in poor quality.

This invention was made with attention to the above points, and the outer conductor of the reciprocating conductor of the linear part of the secondary coil is made of a conductor with a semicircular arc cross section, and the ring part conductor is made of a material with a rectangular cross section. The finished shape of the main insulation after taping is made into a small, perfect circular cross-sectional shape.The cross-sectional dimensions of the insulator tube are reduced and the weight is reduced, making the taping work of the main insulation easier1 (
The purpose of this invention is to provide a current transformer with excellent quality.

Hereinafter, an embodiment of the present invention shown in Figures 1 and 2 will be described. − Reciprocating conductor of the next coil.

7, as shown in FIG. 9, the outer conductors 3/, 32 each having a semicircular arc cross section are arranged side by side with the inter-coil insulation /q in between, and the cross section is configured to have a perfect circular ring shape.

Central tubular conductor 2. insulation tube g and outer conductor 3/.

There are 33 car roads between the 32 and 32, respectively. The ring part conductors 3'l and 3Ar shown in FIG.
The coil is formed to have a semicircular cross section using a material having a rectangular cross section, and the ring portion conductors 3a and 3s are coupled to each other by sandwiching the inter-coil insulation IQ, thereby forming a coil having a perfect circular cross section.

36 is a one-tank oil pipe having a rectangular cross section. Other parts that are the same as those in Figures 1 to 3 are given the same symbols,
The explanation will be omitted.

With the above configuration, the reciprocating conductor 6.
The outer conductors 3t and 32 have a semicircular arc cross section, and when they are combined, the cross section has a perfect circular ring shape, so the inner diameter of the insulator tube can be reduced, and Ko's? Since the cross-sectional area of the mountain path 33 can be increased as shown in FIG. 9, oil circulation is improved. Further, the taping work of the main insulation 15 becomes easier. Furthermore, since the cross-sectional shape of the combination of the 1-tank part conductors 317 and 3k is a perfect circle as shown in Fig. S, the main insulator IT can be easily taped with a small size.

In addition, in the above embodiment, the ring part conductors 3'l, 33-
has a semicircular cross section, and as shown in FIG. 6, the ring part conductor 37°, ? It may be configured to have an oval cross-section, but in this case, only the workability of main insulating taping to the ring conductor is not improved.

As described above, according to the present invention, the insulator tube etc.
The weight can be reduced, which improves economic efficiency, and the main insulation taping process is made easier, improving quality.
This has the effect of increasing the cooling effect.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional elevation view of the conventional model, Figures 2 and 3 are cross-sectional views taken along lines nm and mm in Figure 1, respectively, and Figures q and s are views of this model. FIG. 3 is a sectional view showing one embodiment of the invention and corresponds to FIGS. 2 and 3, respectively, and FIG. 3 is a sectional view showing another embodiment of the invention and corresponding to FIG. S. l...-Next coil straight section, C, l...center tubular conductor, 6
, 7... Reciprocating conductor, Z... Insulating tube, ?・Nobu No. 1 road,
Lda...Insulation between coils, 15...Main insulation, /6...Insulator tube, 17...Iron core, 1g...Secondary coil, lDe...Leading terminal, θ...Outgoing terminal, 2/... Upper tank, 22...
Lower tank, 3/, 3... Outer conductor, 33... No. 1 roadway, 311, 3! ;...Ring part conductor, 36...Ring part road, 3q, 3g...Ring part conductor. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masu Oiwa Ohei 1 illustration leather 4 illustration leather 5 illustration 6 illustration 1 Otsu

Claims (1)

[Scope of Claims] (1) A first road passes through/the pair of outer conductors are arranged in parallel with each other forming a second road between the pair of central tubular conductors and the central tubular conductor. a primary coil straight portion consisting of a reciprocating conductor, and a ring portion having one end connected to the central tubular conductor and the other end connected to the outer conductor, respectively.
A primary coil ring part consisting of a pair of ring part conductors, a secondary coil wound around an iron core arranged to cross over the ring part conductors, and a main insulation taped to the outer conductor and the ring part conductor. and a current transformer that includes an insulator tube that accommodates the linear portion of the primary coil, and that performs a plurality of current transformation ratios by changing the number of turns of the primary coil. 1. A current transformer comprising l pairs of the outer conductors each having a semi-circular cross-sectional shape, each having a semi-circular cross-sectional shape due to the fact that they are juxtaposed with inter-coil insulation in between. (, 2) The current transformer according to claim 1, comprising l pairs of ring portion conductors each having a semicircular cross section, each of which has a perfect circular cross section by being juxtaposed with inter-coil insulation in between. (3) A current transformer according to claim 1, comprising a pair of ring portion conductors each having a semi-elliptical cross-sectional shape, each of which has an oval cross-section by being juxtaposed with inter-coil insulation sandwiched therebetween. (G) A current transformer according to claim 1 or 3, wherein the ring conductor is formed of a material having a rectangular cross section.