JPH08237916A - High-voltage rotating machine stator coil manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a stator coil manufacturing method for a high-pressure rotating machine, which is capable of improving impregnation property of a slot insertion portion and shortening impregnation time. [Structure] In a stator coil of a high-voltage rotating machine obtained by winding a dry laminated mica tape of a film base material, and impregnating and curing the resin, the film base material Wind a tape 5a (hereinafter referred to as a special semiconductive tape) in which a dry laminated mica layer is attached to one side of the semiconductive tape, so that the semiconductive layer is on the outside, longer than the length of the slot insertion portion. It is a manufacturing method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stator coil of a high-voltage rotating machine, which uses a special semi-conductive tape for preventing corona in a slot.

[0002]

2. Description of the Related Art A ground insulation method using a total impregnation method for stator coils of generators and induction motors up to 3 kV and up to medium-sized machines is a dry laminated mica tape using a heat-resistant and insulating film as a base material. After winding it around the coil conductor so that the film base is on the outside, wind a semi-conductive tape coated with a solution of graphite carbon particles in varnish on the heat resistant / insulating film in the slot insertion part, and insert the slot After the wire connection, the stator coil was manufactured by vacuum-pressurizing and impregnating the resin, and heating and curing.

The base material of the dry laminated mica tape includes glass cloth, film and non-woven fabric, but the mechanical winding using a taping machine has a suitable elongation, a high withstand voltage and a relatively low price. The dry-assembled mica tape based on film is often used.

The base material of the dry laminated mica tape and the dry laminated mica layer are bonded together with a small amount of adhesive.

As the semiconductive tape, there is one in which a liquid in which particles of graphite carbon are mixed in a varnish is applied to a substrate such as glass cloth, non-woven fabric or film. Of these, those that use glass cloth as a base material are difficult to stretch, so
Wrinkles are generated during the winding work, and a gap is likely to be formed between the ground insulation and the ground insulation. In addition, a non-woven fabric-based material has poor workability because it is easily stretched and weak in strength. On the other hand, the one using a film as a base material has good elongation and strong strength, and thus has good workability. Therefore, a film-based semiconductive tape is used.

A conventional stator coil manufacturing method is described below.
This will be described with reference to FIGS. 3, 4 and 5. FIG. 5 is a perspective view of the hexagonal shaped stator coil 1. FIG. 3 is a cross-sectional view of a tape layer for explaining a conventional stator coil manufacturing method. In FIG. 3, a conductor 2 is provided with a dry-assembled mica tape 4 (hereinafter referred to as a film mica tape) 4 of a film base material 3,
It is wound so as to have a thickness according to the rated voltage, and ground insulation is formed. In order to suppress the partial discharge generated between the stator coil and the iron core slot, a tension is applied so that it is longer than the slot insertion portion SL of the film mica tape layer wound to a predetermined thickness so as to adhere to the ground insulation. Then, the semiconductive tape 5 is wound so that the semiconductive layer 8 is on the outside.

By the way, in the film mica tape, the resin 6 cannot penetrate from the direction perpendicular to the film surface, but penetrates only from the gap between the overlapping portions of the film mica tape and the dry laminated mica layer 7 as shown by the arrow in FIG. Therefore, if the tape is wound with tension to fit it within a certain size range, the gap between the tapes will be smaller than when it was wound loosely, and the resin can penetrate only from the dry mica layer, and it takes time for the resin to penetrate. .

FIG. 4B shows a conventional film-based semiconductive tape. As with the film mica tape, the resin cannot penetrate from the direction perpendicular to the surface of the tape, and since it does not have a dry laminated mica layer, it penetrates only from the gap between the overlapping part 1 of the tape and the ground insulation, and thus ground insulation. The permeation time is increased by applying a tension so that the film adheres tightly to.

[0009]

The stator coil manufactured by the conventional manufacturing method has a drawback that the impregnation time is long. The present invention improves the impregnation property of the slot insertion portion,
It is an object of the present invention to provide a stator coil manufacturing method for a high-pressure rotating machine, which can be adapted to shorten the impregnation time.

[0010]

[Means for Solving the Problems] The above object is to insert a slot of a coil into a stator coil of a high-voltage rotating machine obtained by winding a dry laminated mica tape of a film base material and then impregnating and curing the resin. On the outermost part of the section, a tape 5a (hereinafter referred to as a special semiconductive tape) having a dry-assembled mica layer attached to one side of the semiconductive tape of the film base, so that the semiconductive layer is on the outside, This is achieved by a method of manufacturing a stator coil of a high-voltage rotating machine, which is characterized in that the winding is made longer than the length of the slot insertion portion.
It should be noted that the dry laminated mica layer may previously contain a catalyst that accelerates the curing reaction with the impregnated resin.

[0011]

[Function] When a special semi-conductive tape is wound, it is possible to secure the same permeation path as the dry laminated mica layer for ground insulation in addition to the gaps in the overlapping parts of the tapes, thus improving the resin permeation in the slot insertion part, The impregnation time can be shortened.

[0012]

EXAMPLE In FIG. 1, a film mica tape (film base material 3: polyester film, dry laminated mica layer 7: hard unbaked mica) 4 is wound on the conductor 2 by half-lap winding to provide ground insulation. Form. Next, a semi-conductive tape (width 19 mm, thickness 0..0) in which a dry laminated mica layer is bonded to one side of a semi-conductive tape of a film base material as shown in FIG. 2 is made longer than the slot insertion portion SL of FIG.
18 mm) 5a, the semiconductive layer 8 is on the outside, and
After winding so that the overlapping portion i of the tape is about 1 mm, the slot is inserted, the wires are connected, and the tape is transferred to the impregnation tank. At this time, in order to monitor the penetration state of the resin by the change in capacitance,
Lead wires are taken out from the conductor of the coil and the iron core inserted into the slot in advance and connected to the external capacitance measuring device via the terminal block of the impregnation tank. Next, after degassing at 1 Torr or less, resin injection, defoaming, and 5 kg / cm ²
Pressurize. Each working time is shown in FIG. The viscosity of the resin used for impregnation is 2.7P.

FIG. 6 is a comparison of the change in capacitance due to the penetration of the resin of the present invention and the conventional method. From FIG. 6, in the case of the present invention, it can be seen that the capacitance saturates in a shorter time than the conventional method. It should be noted that the width of the semi-conductive tape may be set wider than that of the embodiment in accordance with the conductor size without any problem. Further, as the film substrate, a polyimide film, a prephenylene sulfide film, or a polyethylene naphthalate film may be used.

[0014]

According to the present invention, the impregnation time can be shortened by improving the permeability of the resin as compared with the case where the dry laminated mica layer is attached to one side of the semiconductive tape of the film base material. Further, it becomes possible to increase the insulation of the laminated mica layer with the same man-hours as the conventional one.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tape layer for explaining a stator coil manufacturing method of the present invention.

FIG. 2 is a cross-sectional view of the special semiconductive tape of the present invention.

FIG. 3 is a cross-sectional view of a tape layer for explaining a conventional stator coil manufacturing method.

FIG. 4 is a cross-sectional view of a conventional stator coil manufacturing tape. (A) Film mica tape diagram (b) Film base semiconductive tape diagram

5 is a perspective view of a hexagonal shaped stator coil. FIG.

FIG. 6 is a comparative test data diagram of coils manufactured according to the related art and the present invention.

[Explanation of symbols]

1 Tortoiseshell shaped stator coil 2 Conductor 3 Film base material 4 Film base dry laminated mica tape (Film mica tape) 5 Semi-conductive tape 5a Special semi-conductive tape 6 Resin 7 Dry integrated mica layer 8 Semi-conductive layer SL slot insertion part i Tape overlap part

Claims (3)

[Claims] 1. A stator coil of a high-voltage rotating machine, which is obtained by winding a dry laminated mica tape of a heat-resistant and insulating film base material, and then impregnating and curing the resin. The first step of winding dry laminated mica tape, which is a heat-resistant and insulating film base, around the coil conductor shaped into a hexagonal shape multiple times to a predetermined thickness, b. On the outermost part of the slot insertion part of the coil after the first step,
On one side of the semi-conductive tape of heat resistant / insulating film base,
The second step of winding the tape laminated with the dry laminated mica layer once longer than the length of the slot insertion part so that the semiconductive layer is on the outside. The third step of inserting the coil into the stator slot of the rotating machine, placing it in the vacuum impregnation tank, and impregnating the resin with vacuum and pressure, d. Fourth step of heating and curing in a drying oven, the method for manufacturing a stator coil of a high-pressure rotating machine, comprising the above steps. 2. The method for manufacturing a stator coil for a high-voltage rotating machine according to claim 1, wherein the heat-resistant and insulating film is a polyester film. 3. The high-voltage tape according to claim 1, wherein the semiconductive tape of the heat-resistant / insulating film base material is a tape made by coating one surface of the film base material with varnish mixed with graphite carbon. Method for manufacturing stator coil of rotating machine.