JPS6111679Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a current transformer for a nuclear fusion device, and in particular, magnetic flux is generated in the iron core by energizing the primary winding.
The present invention relates to a current transformer for a nuclear fusion device in which an induced current that counteracts this flow flows into the plasma and is heated by Joule heat.

FIG. 1 and FIG. 2 schematically show a tokamak-type nuclear fusion device equipped with the above-mentioned current transformer.

In the tokamak type nuclear fusion device, a plurality of toroidal coils 7 are installed around an annular vacuum vessel 5, and plasma 6 is confined within the vacuum vessel 5 by the magnetic field of the toroidal coils 7. This plasma 6
In order to further heat the primary winding 4, the primary winding 4 is wound and the iron core 2 formed by laminating a plurality of thin steel plates, and the iron core 2 is tightened in the lamination direction with a fastening metal fitting. A current transformer 1 is provided which consists of side plates 3A and 3B which are fastened with certain insulating bolts 10. This current transformer 1
When the primary winding 4 is energized, magnetic flux is generated in the iron core 2, and an induced current that cancels this flows into the plasma 6, which is heated by Joule heat.

Note that the current transformer 1 is installed on a stand 9 with an insulating plate 8 in between.

By the way, in a current transformer for a nuclear fusion device, it is necessary to prevent one electrical turn from being formed in the stacking direction of the iron core 2, and conventionally, insulating bolts 10 are used to tighten the side plates 3A and 3B. was. The details are shown in FIG. As shown in the figure, conventionally side plates 3A, 3
A thick washer 14, a lock nut 15, and a nut 16 are connected to each insulating bolt 10 with an insulating piece 13 interposed in B.
It was tightened through. In this way, conventionally, the insulating bolt 10 is completely insulated from the side plates 3A and 3B, so the ground for preventing static electricity on the current transformer 1 is
The insulating bolts 10 were grounded by connecting lead wires to each other, while the side plates 3A and 3B were each grounded individually. In other words, it was necessary to provide several earthing points from one current transformer 1.

Therefore, in order to prevent the current transformer from being electrified, the lead wires must be connected to each of the current transformers, and electrification cannot be effectively prevented.

The present invention has been developed in view of the above points, and its purpose is to provide a current transformer for a nuclear fusion device that can effectively prevent charging of the current transformer.

This invention electrically conducts only one part of the fastening fittings that fasten the side plates of the iron core together at multiple places.
In addition, the intended purpose is achieved by electrically insulating only one side plate except for one electrically conductive fastening fitting.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. Incidentally, the same reference numerals are used for the same parts as in the past.

FIG. 4 shows an embodiment of the present invention. As shown in the figure, in this embodiment, the side plates 3A and 3B are fastened with one-sided insulating bolts 11 and shorting bolts 12. That is, the insulating bolt 11 on one side is short-circuited to the side plate 3A, and is tightened to the side plate 3B with the insulating piece 13 interposed, while the short-circuit bolt 12 is short-circuited to the side plate 3B.
There is a short circuit. The number of short-circuiting bolts 12 used is only one. As a result, side plates 3A, 3
B. The one-side insulating bolt 11 and the shorting bolt 12 are electrically connected, but the side plate 3B is electrically connected to the shorting bolt 12 at only one point, so no one turn is formed in the core thickness direction.

Therefore, to prevent static electricity in the current transformer 1, it is not necessary to connect the lead wires between the insulating bolts and ground them, or to ground each side plate individually, but it is possible to prevent the current transformer 1 from charging with a simple structure that only requires one grounding point. Can be done. Furthermore, it is economical because the insulation bolt only needs to be insulated on one side.

Further, a current transformer is generally subjected to a withstand voltage test, which can be easily performed by replacing the shorting bolt 12 with an insulating bolt 11 on one side.

According to the current transformer for a nuclear fusion device of the present invention as described above, the antistatic ground can be provided at only one place in the entire current transformer, and it is effective in preventing static electricity.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view schematically showing a tokamak-type nuclear fusion device, Figure 2 is a side view of Figure 1, Figure 3 is a detailed cross-sectional view of a conventional iron core tightening structure, and Figure 4 is a cross-sectional view of the present invention. FIG. 2 is a detailed cross-sectional view of a core tightening structure showing one embodiment. 1... Current transformer, 2... Iron core, 3A, 3B... Side plate, 4... Primary winding, 5... Vacuum vessel, 6... Plasma, 7... Toroidal coil, 8... Insulating plate, 9...stand, 10...insulation bolts on both sides,
11...One side insulation bolt, 12...Short circuit bolt,
13... Insulating piece, 14... Thick washer, 15... Lock nut, 16... Nut.

Claims (1)

[Scope of utility model registration request] A plurality of toroidal coils are installed around an annular vacuum vessel, plasma is confined within the vacuum vessel by the magnetic field of the toroidal coils, and a plurality of thin steel plates are laminated and side plates are applied to both ends of the same, A current transformer consisting of an iron core formed by tightening at multiple locations in the stacking direction with clamping fittings via the side plate, and a primary winding wound around the iron core is installed around the vacuum vessel. In a current transformer for a nuclear fusion device, in which magnetic flux is generated in the core by energizing the primary winding, an induced current that cancels this flows into the plasma, and is heated by Joule heat. Only one of the fastening fittings that are tightened at multiple locations is electrically conductive, and the parts other than the one electrically conducting fastening fitting are electrically insulated from only one side plate. A current transformer for a nuclear fusion device characterized by: