JPH0447946Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to an air-core reactor.

(Prior Art) As is well known, this type of air-core reactor is configured such that an air-core coil is housed in a tank and a lead wire from the air-core coil is drawn out of the tank.

FIGS. 3 and 4 show a part of the conventional configuration. For example, a disc-wound air-core coil 1 is wound around an insulating tube 2 as a winding core, and 3 relaxes the electric field at the end of the air-core coil 1. 4 is a tank. 5 is a lead wire drawn out from the air-core coil 1, and 6 is an insulator applied to the lead wire, which is usually constructed by wrapping paper or resin tape around it.

(Problem to be solved by the invention) Conventionally, the lead wire 5 was drawn out from the air-core coil 1 from the upper end of the air-core coil 1 toward the outside, as shown in the figure. .

Therefore, the size of the tank 4 was not determined by the insulation distance from the air core coil 1, but was determined by the insulation distance from the lead wire 5. Therefore, the tank 4 inevitably has to be large, or if you try to provide the necessary insulation distance only in the portion where the lead wire 5 and the tank 4 oppose each other, the fourth
As shown in the figure, the tank must have a protruding part facing the lead wire 5, which complicates the structure of the tank 4 and makes its manufacture cumbersome.

In addition, the weakest point of the lead wire 5 is the lead wire 5 (root portion), and the lead wire 5 disturbs the electric field and the electric field is concentrated at the root portion. Insulation required special attention.

The purpose of this invention is to make the tank that houses the air-core coil smaller and simpler, and to simplify the insulation of the lead wire extraction portion.

(Means for solving the problem) This idea is to directly pull out the lead wire of the air-core coil toward the inside of the air-core coil through a notch previously provided in the insulating cylinder around which the air-core coil is wound, and then It is characterized in that it penetrates the tank cover and leads out to the outside.

An embodiment of this invention will be explained with reference to FIG.

The air-core coil 1 is placed on a pedestal 9 that is fixed to the lower metal fitting 7 with bolts 8. A top creeping insulating support 11 is placed on top of the air-core coil 1 via an electrostatic shield 3, and a coil holding fitting 12 is placed on top of the insulating support 11. 2 is an insulating cylinder around which the coil is wound; 13 is a bolt for holding down the coil; 15 is an electromagnetic shield; 16 is a stud for tightening; and 18 is a bolt for tightening the stud.

Note that the tank 4 is filled with an insulating medium such as insulating oil or insulating gas (for example, SF6).

These configurations are not particularly different from conventional ones. In this invention, a lead wire 5 drawn out from the upper end of the air-core coil 1 is directly drawn out toward the inside of the air-core coil 1 through a notch previously provided in an insulating tube 2 around which the air-core coil 1 is wound.

Lead wire 5 pulled out inside the air core coil 1
is then drawn upwards, ie upwardly from the center of the coil. Then, it passes through the cover 19 of the tank 4 and is led out.

Note that the part of the lead wire 5 coming out of the air-core coil 1 that faces the tank 4 needs to be strongly insulated, so at least that part should be covered with an insulator as shown in Figures 3 and 4. Do you give it?
It is preferable to provide a shield 20 for relaxing the electric field.

(Function) Of the lead wires 5 drawn out from the air-core coil 1, the lead wire portion that is still inside the air-core coil 1, that is, the drawn-out portion, has no concentration of electric field inside the air-core coil. ) insulation can be simplified.

Moreover, since the lead wire 5 no longer exists between the air-core coil 1 and the side wall of the tank 4, the insulation distance between the air-core coil 1 and the tank 4 can be determined by the distance between the two. Therefore, the tank 4 can be configured to be smaller than the configuration shown in FIG. 3, and there is no need to use a knobbed tank as shown in FIG. 4, making it possible to simplify this type of tank. .

In addition, in the case of a single-phase air-core reactor, since the air-core coil 1 is cylindrical, the tank 4 may also be cylindrical. It is expected that the tank will be simplified.

(Effects of the invention) As detailed above, according to this invention, it is possible to sufficiently miniaturize and simplify the tank for storing the coil of the air-core reactor, and the lead wire drawn out from the air-core reactor can be This has the effect that the insulation of the drawer portion can also be simplified.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is an enlarged view of a portion of FIG. 1, and FIGS. 3 and 4 are sectional views showing a portion of the conventional example. 1... air core coil, 2... insulating tube, 4... tank, 5... lead wire.

Claims (1)

[Scope of utility model registration request] Pull out a lead wire from the upper end of the air-core coil stored in the tank, and direct the drawn-out lead wire toward the inside of the air-core coil through a notch previously provided in an insulating cylinder around which the air-core coil is wound. An air-core reactor in which the lead wires are pulled out and further pulled out above the air-core coil, penetrate through the cover of the tank, and lead out to the outside.