JPH0329973Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a winding of a high-voltage rotating electric machine that facilitates local repair of a coil integrally attached with an iron core using a whole impregnation method.

<Prior art and its problems> As shown in Fig. 1a, the coil 2 attached to the iron core 1 has its coil side portion 3 housed in the slot of the iron core 1, and the coil end portion 4 protruding from the slot. There is. This coil end part 4
As shown in section 1b, the layer insulation 6 is wound around the outer periphery of the conductor 5, which is made up of bundled wires (six wires in the figure). ) A plurality of conductors 5 are grouped together and ground insulation 7 is applied to the outer periphery of the coil 2 made of a conductor.

When attaching such a coil 2 to the iron core 1, the entire impregnation method, in which liquid resin is vacuum impregnated and then heated and hardened to make it stick together, has excellent adhesive properties and is extremely effective in terms of moisture resistance, arc resistance, and heat resistance. Therefore, it has come to be used in large rotating electric machines.

However, compared to the conventional method, this whole impregnation method makes it difficult to perform local repairs at the end of the coil, and improvements in this respect have been strongly desired. For example, if the location of the insulation breakdown accident was a coil end protruding outside the slot of the upper coil, in the conventional method it would be possible to repair the problem by cutting out the fault point, replacing it with a new coil part, and connecting it. However, in the total impregnation method, even if you try to disconnect the fault point of the coil end and connect a new coil end, it is necessary to connect a new conductor to a healthy conductor and apply the specified insulation to this conductor connection. Even if an attempt was made to do so, it was extremely difficult to separate the layer insulations by cutting them apart because the layer insulations of the coils (inter-turn insulation) were impregnated with resin or the like and bonded together. Furthermore, if the coil was forcibly removed, the layer insulation would be damaged and the insulation strength of the coil would be impaired.

Therefore, the present invention solves the drawbacks of the above-mentioned conventional technology,
An object of the present invention is to provide a high-voltage rotating electric machine winding in which a coil attached to an iron core can be easily locally repaired using a whole impregnation method.

<Means for Solving the Problems> The present invention achieves the above-mentioned purpose by providing a coil end portion of a coil attached to an iron core in a high-voltage rotating electric machine winding of a total impregnation method, and a coil end portion of a coil attached to a core, in which each of a plurality of conductors is The present invention is characterized in that a releasable insulating tape is wound around the outer periphery of the layer insulation of the coil, which is formed by sequentially applying a wound layer insulation and a ground insulation made by winding the plurality of conductors collectively.

<Example> An example of the present invention will be described below based on the drawings.

In the winding of this embodiment, as shown in the cross-sectional view of FIG. 2a, a layer insulation 6 is provided on the outer periphery of the conductor 5 of each layer of the coil, which is installed in the slot of the iron core 1 by the whole impregnation method. These layer conductors 5
An insulating tape 8 with good releasability is wound around the outer periphery of the layer insulation 6 on the coil end portion 4 of the coil end portion 4. This structure is provided with insulation 7. The releasable insulating tape 8 is wound to make it easier to separate the layer conductors 5 of the coil from each other, and even if it is wound around all the layers of the conductor 5 of each layer as shown in Fig. 2a. often,
Alternatively, the same effect can be obtained by alternately winding the conductor 5 in every other layer of each layer as shown in FIG. 2b. Furthermore, the part around which the releasable insulating tape 8 is wound may be applied over the entire coil end part 4, or may be wound in a concentrated manner on a part of the coil end part 4 that is particularly susceptible to damage. In addition, the insulating tape 8 is preferably a Teflon trademark tape, a silicone tape, etc., which has insulating properties as well as the layer insulation 6.

<Effects of the invention> In such high-voltage rotating electric machine windings, even if an accident occurs at the coil end, the releasable tape is wrapped around the outer periphery of the layer insulation at the coil end. When removing the damaged part of the coil end and replacing it with a new coil,
When insulating the connection part with the new coil that will be connected to the healthy part of the coil end part,
The release tape makes it easy to peel off the insulation, making it easy to peel off the layer insulation, and each layer insulation in the healthy part of the coil can be easily separated from the conductor, so it is installed on the core using the entire impregnation method. To easily perform local repair of a coil.

[Brief explanation of drawings]

Figures 1a and b relate to a conventional example; Figure 1a is a side view extracting the coil end portion of the coil attached to the iron core; Figure 1b is a side view showing the insulation structure of the coil; The cross-sectional views taken along line X-X' in the middle, Figures 2a and b relate to the embodiment of the present invention, and Figure 2a shows the outer periphery of the coil end portion of the conductor of each layer, respectively.
A cross-sectional view showing a winding of a high-voltage rotating electrical machine with a releasable insulating tape wound around it. FIG. 3 is a cross-sectional view showing an electric machine winding. In the drawing, 1 is the iron core, 2 is the coil side part, 4
5 is a coil end portion, 5 is a conductor of each layer, 6 is insulation, 7 is ground insulation, and 8 is a releasable insulating tape.

Claims (1)

[Scope of utility model registration request] In the winding of a high-voltage rotating electric machine using the whole impregnation method, the coil end portion of the coil attached to the iron core includes layer insulation wound around each of a plurality of conductors and ground insulation wound around the above-mentioned plurality of conductors collectively. A winding wire for a high-voltage rotating electric machine, characterized in that a releasable insulating tape is wound around the outer periphery of the layer insulation of a coil in which the above-mentioned layer insulation is sequentially applied.