JPH0824415B2 - Shielding device for rotating electric machine winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a winding of a high-voltage rotating electric machine such as a turbine generator or a water turbine generator, and in particular, performs potential control inside a coil. The present invention relates to a shield device for a rotating electric machine winding.

(Prior Art) Electric stress generated in a coil conductor incorporated in a generator or the like is not uniform, and a corner portion where an electric field is concentrated is higher than a flat conductor portion (eg, Yoshida, Umemoto: National Conference of the Institute of Electrical Engineers of Japan) Proceeding, No. 291, Sho 60). And since the maximum electric field at this corner becomes larger as the radius of curvature of the conductor corner becomes smaller,
For the purpose of relaxing the electric field concentration at the corners, a semiconductor conductive tape or sheet is wound around the outer periphery of the conductor 2 to form the potential shield layer 1 as shown in FIG. A method to increase the size has been proposed (eg (A.Wi
chmann: IEEE Trans.PAS, Vol. 102, No. 1, 1984).

(Problems to be Solved by the Invention) In order to provide the shield layer 1 with a high electric field relaxation effect,
It is necessary to electrically connect the shield layer 1 to the conductor 2 and control the potential thereof. However, the wires 3 that make up the conductor 2
Are covered with the wire insulation 4, and the dislocations are applied to the wire 3 in the slot 5 so that its position in the conductor 2 is constantly changing. Is filled. For this reason, when forming the electrical connection position in the coil slot portion 5, there has been a problem that it takes a lot of time and cost to remove the coating 4.

When attempting to remove the outer corner portion coating 4 of a plurality of strands 3 located at the corners of the conductor 2, the strands 3 with the coating 4 removed
Insulation may be impaired between them, and the removed portions of the coating 4 are scattered in the longitudinal direction of the coil. Therefore, unless the winding tension of the semiconductive tape 8 is sufficiently increased, the semiconductive tape required for the potential shield. The electric connection between the conductor and the conductor 2 may not be surely made.

In order to solve the above problems, the present invention provides a shield device for a rotary electric winding that can surely control the potential of the conductors without compromising the insulation between the wires constituting the conductor. The purpose is to

[Structure of Invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention relates to a conductor wire bundle formed by bundling conductors having wire insulation around the wire, and a coil of the conductor wire bundle. At least one of the end parts
The conductor wire insulation of the conductors arranged at the corners of the conductor wire bundle is removed to form a removed portion, and a semi-conductive tape is applied so as to cover the removed portion and the coil slot portion of the conductor wire bundle. (EN) Provided is a shield device for a rotating electric machine winding, which is wound to form a shield layer and has ground insulation on the outer periphery thereof.

(Operation) In the potential shield device according to the present invention, since the coil end portion where the dislocation of the wire 3 is not applied is the electric machine connecting position between the shield layer 1 and the conductor 2, the conductor 2 corresponding to this electric machine connecting position. In order to remove the outer corner portion coating 4 of the element wire 3 located at the corner of the conductor 2, only the outer corner portion coating 4 of the wire element 3 located at the corner of the conductor 2 is removed. The insulating property between the individual wires constituting the above is not impaired at all, and by increasing the winding tension of the semiconductive tape 8, it is possible to obtain the shield layer 1 that is electrically connected to the conductor 2 reliably.

(Embodiment) An embodiment of a shield device for a rotary electric machine winding according to the present invention will be described below with reference to FIGS. 1 and 2.

The conductor portion 7 corresponding to the end of the electric field relaxation layer provided at both ends of the coil surface, and the outer corner portion coating 4 of the wire 3 located at the corner of the conductor 2 is removed. The shield layer is electrically connected.

The shield layer 1 is formed by impregnating a polyester non-woven tape using a thermosetting resin mixed with carbon black and imparting semiconductivity as a reinforcing material, and heat-treating the semiconductive tape 8 on the outer periphery of the conductor 2. Further, it is formed by continuous winding in a range including the portion 7 from which the wire coating 4 has been removed and the coiled lot portion 5.

Then, a ground insulating mica tape is wound around the outer periphery in accordance with the rating of the rotating electric machine, and then thermosetting resin is impregnated and cured to form the ground insulating 10.

 Next, the operation will be described.

In such a structure, since the outer corner portion coating 4 of the wire 3 located at the corner of the conductor 2 is removed and the shield layer 1 and the conductor 2 are directly electrically connected, the potential control of the shield layer 1 is easy. It is possible to have a high electric field relaxation effect. In addition, the outer corner portion coating 4 of the wire 3 located at the corner of the conductor 2
Since only this is removed, the insulation between the individual wires 3 is not impaired,
The shield layer 1 can be easily formed by winding the semiconductive tape 8. Further shield layer 1
Since the coil end portion 6 is provided as an electrically insulating portion between the conductor 2 and the conductor 2, the outer corner portion coating 4 of the wire 3 can be removed by a simple work such as sanding.

The present invention is not limited to the above-described embodiment, and for example, the material of the semi-conductive tape 8 may be changed or the winding range of the semi-conductive tape 8 may be expanded to increase the shield layer 1 and the conductor 2.
It may be carried out by changing the electric connection point to the series connection point of each coil or the like without changing the gist of the coil.

〔The invention's effect〕

As described above, according to the present invention, since the coil end portion is provided with the electrical connection portion between the shield layer and the conductor, the work is facilitated, and the insulation between the individual wires is not impaired, and the It is possible to obtain a shield device for a rotating electric machine winding capable of controlling a potential.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a coil end portion in an embodiment of a rotary electric machine winding shield device according to the present invention, and FIG. 2 is a schematic diagram showing an implementation method in an embodiment of a rotary electric machine winding shield device according to the present invention. 3 and 4 are cross-sectional views of the slot portion of the coil having the shield layer. 1 ... Shield layer, 2 ... Conductor 3 ... Element wire, 4 ... Element wire insulation 5 ... Coil slot part, 6 ... Coil end part 7 ... Element wire coating removal part, 8 ... Semiconductor tape 10 ... Ground insulation

Claims (1)

[Claims] 1. A conductor wire bundle formed by bundling conductors having wire insulation around the wire strand, wherein at least one of the coil end portions of the conductor wire bundle has a corner of the conductor wire bundle. The wire insulation at the outer corners of the arranged wire is removed to form a removed portion, and a semi-conductive tape is wound so as to cover the removed portion and the coil slot portion of the wire bundle to form a shield layer. A shield device for a rotary electric machine winding is characterized in that ground insulation is formed on the outer periphery thereof.