JPH06284654A - Insulation treatment method of winding for high voltage electric rotating machine - Google Patents

Abstract

PURPOSE:To prevent resin, to be pushed out from an coil end insulation layer during thermal curing process, from spreading while facilitating removal thereof. CONSTITUTION:In a method for forming the slot insulation layer 4 and the coil end insulation layer 5 of the stator coil 1 in a high voltage rotating machine in this order, wherein both layers are composed of epoxy prepreg laminated mica tapes, an exfoliation layer 12 covering a high resistance corona-proof layer and a resin absorption layer 13 for fastening the exfoliation layer from the outside are provided as a resin absorbing means 11 for fastening the slot insulation layer 4 from the outside in the vicinity of the end of the coil end insulation layer 5 which is then subjected to thermal curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of insulating a stator winding of a high-voltage electric motor or generator, and particularly to a dry type in which the insulating treatment of slot insulation and the insulating treatment of a coil end insulating layer are performed separately. The present invention relates to an insulation treatment method by the method.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view of a main part for explaining a conventional insulation treatment method for a high-voltage rotating machine winding. ) 1 is that the coil conductor 3 is first taped with an epoxy prepreg assembled mycatep (hereinafter abbreviated as prepreg tape) a predetermined number of times, and then a necessary temperature and pressure are applied for a predetermined time by a heat press to prepare the prepreg tape. The epoxy resin therein is heat-cured to form the slot insulating layer 4. Then, on the surface of the slot insulating layer 4, a low-resistance slot corona prevention layer 6 and a high-resistance end corona prevention layer 7 are formed.
To form. Then, a pre-breg tape is taped a predetermined number of times from the end of the slot insulating layer to the coil end of the coil conductor 3, and a heat shrink tape is taped outside the tape, and then the entire coil is heated. The epoxy resin in the prepreg tape is cured to form the coil end insulating layer 5. Further, a method is also known in which after the stator coil is inserted into the slot of the stator core 2, the coil end insulating layer 5 is heat-cured.

[0003]

In the heat hardening treatment of the coil end insulating layer, the heat shrink tape is shrunk by heating and the binding force is applied to the prepreg tape layer, and the air between the tape layers is expelled. At the same time, the epoxy resin, which has been softened and has increased fluidity, fills the gaps and hardens to form the dense coil end insulating layer 5. By applying the binding force, excess resin in the prepreg tape layer is extruded from the end of the coil end insulating layer toward the slot insulating layer, for example, the end corona preventive layer 7
When the coil alone is heated and cured, the corona prevention layer 7 is removed when the cured product of the adhered resin is removed because the resin is cured while being attached to the surface of the slot corona prevention layer 6 or the slot.
There is also a problem that the slot corona preventive layer 6 is damaged. In addition, in the method of heat hardening after mounting the coil on the iron core, the extruded resin penetrates into the gap between the coil and the iron core and hardens, so that thermal expansion and contraction applied to the stator coil during operation causes In addition to the problem that the end corona preventive layer 7 and the slot corona preventive layer 6 are damaged, there is a problem that it is difficult to remove the coil from the iron core in order to transport the high-voltage rotating machine to the site.

An object of the present invention is to prevent the resin extruded from the coil end insulating layer from spreading and facilitate its removal.

[0005]

In order to solve the above-mentioned problems, according to the present invention, the slot insulating layer and the coil end insulating layer of the coil of the high-voltage rotating machine are both made of the tape layer of the epoxy prepreg assembled mycatap. In the method of performing the insulation treatment in the order of the slot insulating layer and the coil end insulating layer, a resin absorbing means for binding the outer periphery of the slot insulating layer close to the end of the coil end insulating layer is provided to provide the coil end insulating layer. A heat curing process is performed.

Further, the resin absorbing means comprises a peeling layer wound so as to cover the high resistance corona preventing layer previously formed on the slot insulating layer, and a resin absorbing layer for tightly binding the peeling layer from the outside. The resin absorbing means is removed when the heat curing treatment of the end insulating layer is completed. Further, the resin absorbing means includes a cushion material interposed between two high-voltage rotating machine coils previously inserted into the slots of the iron core, and a resin absorbing means for binding the cushion material from the outside of the two high-pressure rotating machine coils. Layer, and the resin absorbing means is removed when the heat curing treatment of the coil end insulating layer is completed.

Further, the resin absorbing means is interposed between two high-voltage rotating machine coils previously inserted into the slots of the iron core, and the cushion material is provided from the outside of the two high-pressure rotating machine coils. A varnish treatment is performed on the resin absorbing means when the coil end insulating layer is heated and cured.

[0008]

According to the present invention, the resin hardening means for binding the outer circumference of the slot insulating layer close to the end of the coil end insulating layer is provided to heat and cure the coil end insulating layer. Since the epoxy resin extruded from the coil end insulating layer inside is absorbed by the resin absorbing means and prevents from spreading to the slot insulating layer side, for example, a cured product of the resin that is difficult to remove on the end corona preventing layer or the slot corona preventing layer is The function of preventing the generation is obtained.

Further, the resin absorbing means is composed of a peeling layer wound so as to cover the high resistance corona preventing layer previously formed on the slot insulating layer, and a resin absorbing layer for binding the peeling layer from the outside. If the resin absorbing means is configured to be removed when the heat curing treatment of the coil end insulating layer is completed, the fibrous insulating material hardened by the cured product of the absorbed resin can be easily removed together with the peeling layer. A high-voltage rotating machine winding that does not leave a trace of the resin extruded by the heat curing treatment of the end insulating layer can be obtained.

Further, the resin absorbing means is interposed between the two high voltage rotating machine coils previously inserted into the slots of the iron core, and the cushion material is tightly bound from the outside of the two high voltage rotating machine coils. Composed of a resin absorption layer,
If the resin absorbing means is configured to be removed when the heat curing treatment of the coil end insulating layer is completed, the resin extruded from the coil end insulating layer during the heat curing is absorbed by the fibrous insulating material, and the resin absorbs the slots and the coil. It is possible to obtain the function of removing the resin absorbing means without damaging the slot insulating layer and the corona preventing layer while preventing the resin absorbing means from penetrating into the gap.

Furthermore, the resin absorbing means is interposed between the two high-voltage rotating machine coils previously inserted into the slots of the iron core, and the cushion material is tightly bound from the outside of the two high-pressure rotating machine coils. If the resin absorbing means is configured to be varnished, and the resin absorbing means is subjected to varnish treatment at the time of completion of the heat curing treatment of the coil end insulating layer, the resin-cured fibrous insulating material and cushioning material It is possible to obtain the function of strengthening the mechanical support of the winding by also serving as a part of the fastening member of the winding of the high-voltage rotating machine.

[0012]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a cross-sectional view of an essential part showing a method of insulating a winding of a high-voltage rotating machine according to an embodiment of the present invention. The same components as those of the prior art are designated by the same reference numerals, and a duplicate description will be omitted. To do. In the figure, the resin absorbing means 11 has a release layer 12 wound with, for example, a fluororesin tape so as to cover the end corona preventive layer 7, and a glass fiber tape or a polyester fiber tape wound around the release layer 12. The resin absorption layer 13 is formed. When the coil end insulating layer 5 of the stator coil 1 configured as described above is heat-cured,
The epoxy resin softened and increased in fluidity is extruded from the end portion of the coil end insulating layer by the binding force of the heat shrink tape, but the exuded resin is absorbed by the resin absorption layer 13 and hardened and peeled off. Since the layer 12 also prevents the end corona preventing layer 7 from penetrating, the epoxy resin extruded from the coil end insulating layer adheres to the surface of the end corona preventing layer 7 or the slot corona preventing layer 6, cures, and is removed. It is possible to prevent the formation of an unnecessary resin layer that is difficult to form, and at the time when the heat curing treatment of the coil end insulating layer 5 is completed, the resin absorption layer 13 and the peeling layer 1
By removing 2 the stator coil 1 of high quality can be obtained without damaging the end corona preventive layer 7 or the slot insulating layer 4 and leaving no waste resin layer on the coil surface.

FIG. 2 is a fragmentary sectional view showing an essential part of an insulation treatment method according to another embodiment of the present invention. After the stator coil 1 is housed in the slot 2A of the iron core 2, the coil end insulating layer 5 is heated. The case where the curing treatment is performed is shown as an example. In the figure, a resin absorbing means 21 includes a cushion material 22 made of, for example, sponge-like silicone rubber interposed between layers near the ends of the coil end insulating layers of a pair of upper and lower stator coils, and a glass fiber string or polyester fiber. The cushioning material 22 is configured so that the resin absorbent layer 23 binds the cushion material 22 from the outside of the pair of coils.

When the coil end insulating layer 5 of the stator coil 1 thus constructed is heated and hardened, the epoxy resin softened and increased in fluidity is coil end insulated by the binding force of the heat shrink tape. The resin extruded from the end of the layer to the side of the slot insulating layer 4 is absorbed by the cushion material 22 and the resin absorption layer 23 and hardened, and is transferred to the slot 2A of the iron core 2 along the surface of the slot insulating layer 4. Since it is possible to prevent the resin that spreads and locally fixes the coil 1 to the iron core 2 from spreading, for example, when disassembling a large rotating machine and transporting it to the installation location, the stator coil 1 is not damaged. It becomes possible to pull out from the slot 2A.

When the heat-curing treatment of the coil end insulating layer 5 is completed and the unnecessary resin absorbing means 21 is removed, the peeling layer 13 used in the above-mentioned embodiment is provided beforehand. The resin absorbing means can be removed without damaging the slot insulating layer or the corona preventive layer. Further, when the resin absorbing means is left after the heat curing treatment is completed, the resin absorbing resin step 21 is treated with a varnish such as a varnish as in the case of other coil end portions. The cured fibrous insulating material and cushioning material also serve as a part of the fastening member of the high-voltage rotating machine winding, and a mechanically reinforced high-voltage rotating machine winding can be obtained.

[0016]

As described above, according to the present invention, the resin absorbing means for binding the outer periphery of the slot insulating layer close to the end of the coil end insulating layer is provided to heat and cure the coil end insulating layer. . As a result, the epoxy resin extruded from the coil end insulating layer during the heat curing treatment can be prevented from being absorbed by the resin absorbing means and spreading to the slot insulating layer side. The problems of the prior art, such as the formation of a hardened resin cured product, or the resin permeating into the slot to make it difficult to extract the coil, were eliminated, and it was necessary to remove the unnecessary resin cured product. Since the man-hours and damages to the insulating layer and the corona preventive layer caused by this work are avoided, it is possible to provide an insulating treatment method that can provide a highly reliable high-voltage rotating machine winding economically and advantageously.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a method of insulating a winding of a high-voltage rotating machine according to an embodiment of the present invention.

FIG. 2 is a fragmentary sectional view showing an essential part of an insulation treatment method according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part for explaining a conventional insulation treatment method for a high-voltage rotating machine winding.

[Explanation of symbols]

 1 High-voltage rotating machine winding (stator coil) 2 Iron core 2A Slot 3 Coil conductor 4 Slot insulation layer 5 Coil end insulation layer 6 Slot corona prevention layer 7 End corona prevention layer 11 Resin absorption means 12 Release layer 13 Resin absorption layer 21 Resin Absorbing means 22 Cushion material 23 Resin absorbing layer

Claims (4)

[Claims] 1. A method for performing insulation treatment in the order of the slot insulation layer and the coil end insulation layer, in which both the slot insulation layer and the coil end insulation layer of the high-voltage rotating machine coil are made of a tape layer of an epoxy prepreg assembly mycatep. At
A method for insulating a winding of a high-voltage rotating machine, comprising: providing a resin absorbing means for binding the outer periphery of the slot insulating layer close to the end of the coil end insulating layer to heat-cure the coil end insulating layer. 2. A resin absorbing means comprises a peeling layer wound so as to cover a high resistance corona preventing layer formed in advance on the slot insulating layer, and a resin absorbing layer binding the peeling layer from the outside. 2. The insulation treatment method for a high-voltage rotating machine winding according to claim 1, wherein the resin absorbing means is removed when the heat curing treatment of the end insulating layer is completed. 3. A cushioning material having resin absorbing means interposed between two high-voltage rotating machine coils previously inserted into slots of an iron core, and the cushioning material is tightly bound from the outside of the two high-pressure rotating machine coils. 2. The method of insulating treatment of windings of a high-voltage rotating machine according to claim 1, wherein the resin absorbing means is removed when the heat curing treatment of the coil end insulating layer is completed. 4. A cushioning material, wherein a resin absorbing means is interposed between two high-voltage rotating machine coils previously inserted into slots of an iron core, and the cushioning material is tightly bound from the outside of the two high-pressure rotating machine coils. The insulating treatment of the winding of a high-voltage rotating machine according to claim 1, wherein the resin absorbing means is subjected to varnish treatment at the time when the heat curing treatment of the coil end insulating layer is completed. Method.