JPS6028109A - Insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a high-voltage insulated wire that uses a film-backed Mikaburi preg tube assembly and has high voltage resistance and excellent processing resistance.

[Prior art and its problems]

This type of high-voltage insulated wire is made of laminated mica, which uses a film base material or glass base material as the backing material, coats prepreg resin (semi-cured resin) on this, and then laminates laminated mica on top of this. A mica-wound insulated wire is known, which is made by using prepreg tape and attaching it vertically to a conductor, and then winding the tape horizontally on top of the prepreg tape. The conventional technology uses a general 1U polyester film (as defined in J I 802318, G
2) based on the weight of the film and laminated mica, using epoxy resin etc. as the prepreg resin.
A composite mica tape containing 0 to 30% by weight is used, which has the following drawbacks.

When winding tape around a conductor to produce an electric wire with predetermined specifications, the winding tension of the tape and Although it is required to increase the winding speed as much as possible,
The tensile strength of polyester film for general electrical use, which is commonly used (+) to 1+, is 12Kf/1i at 5% elongation.
Since it is around n2, cutting at the etched part of the conductor is seen during winding, so it is necessary to reduce the tension of the tape or slow down the winding speed, which slows down the manufacturing speed of the wire and does not meet the above requirements. It was a solid layer. In addition, when manufacturing an insulated coil by hardening the winding wires to a specified number and applying ground insulation, the resin content of the mica tape should be 20~
Since the amount is as high as 30% by weight, the semi-cured resin flows between the tape wraps during hardening of the wire or press heat curing when providing a ground insulating layer, and the resin hardens and causes mechanical damage to the resin insulating layer during the coil forming process. Separation and cracking may occur, resulting in a decrease in breakdown voltage, and there is a problem in that reliability against surges in high voltage or vacuum switches is low. Furthermore, there were also problems with thermal stability, such as mica scattering during tape winding work and mica pieces peeling off from each other during high-temperature processing.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and provide a mica-wound insulated wire that is easy to manufacture and has excellent processing resistance and surge resistance.

[Key points of the invention]

This invention provides an insulation film in which a film-backed mica prepreg tape is vertically attached to a conductor and the tape is wound horizontally on the conductor, and the film has a thickness of 16/ff1lI+2 or more when stretched by 5 inches. A high-strength mica with a tensile strength of By setting the content to 8 to 17% by weight, it is possible to provide an insulated wire that has good manufacturing workability and excellent workability and surge resistance.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the invention. 1 is a conductor, 2 and 3 are film-backed laminated mica pre-preg tapes, 2 is a longitudinally laminated laminated mica layer, and 3 is a horizontally wound laminated mica layer. However, the film has 16K when stretched by 5 inches.
A polyester film having a tensile strength of f/l +++++2 or more (for example, a polyester film manufactured by Kalle under the trade name Ho5ta)
phan). Approximately 5 aromatic polyamide fibers are added to the laminated mica to prevent mica from scattering when the tape is wound.
Unfired mica (manufactured by Nippon Aroma Co., Ltd.) mixed in weight percent is used.

The film is not limited to those mentioned above, and films made of polyimide, polyamide, etc. other than polyester can also be used as long as the tensile strength is 16 kg/rtrs 2 or more. Further, the mica does not have to be unfired mica, and fired mica can also be used, and the organic fiber for paper mixing is not limited to aromatic polyamide, but polyester fiber or the like can also be used.

As the resin for the glypreg of the laminated mica, heat-resistant epoxy resin 11k, silicone resin, polyimide resin, etc. are used, and the amount of the resin used is 8 to 17% by weight based on the weight of the film and the laminated mica. A semi-cured tape, so-called prepreg tape, is constructed using a hardening agent. An insulated wire as shown in FIG. 1 is constructed by using the assembled mica prepreg tape lined with such a film.

In order to confirm the performance of the insulated wire constructed as described above, the inventor prepared wire samples with different insulation configurations as described below and conducted an experiment regarding the breakdown voltage retention rate.

Prepared insulated wire sample: (a) Film made by Kalle [Ho5ta]
Using a polyester film available under the trade name of phan J, unfired mica mixed with approximately 5% by weight of aromatic polyamide fiber manufactured by Nippon Aroma Co., Ltd. was used as the laminated mica.
A heat-resistant epoxy resin is used as the prepreg resin, and the amount of the resin is 8 to 17% by weight.

(b) In 0), calcined mica is used instead of uncalcined mica.

()9&), in which a polyester film for general electrical use (specified in J I 802318) is used as the film.

@) In (a), the amount of resin for prepreg is 20% by weight and t%.

(→ Conventional technology, using the film used in (c), using calcined mica without mixing organic fibers, with a prepreg resin content of 20% by weight O, these samples l
The results of measuring the change in breakdown voltage retention with respect to ζ are shown in the second
As shown in the figure. As shown in Fig. 2, the retention rate of breakdown voltage after bending after heating at 180°C for 2 hours shows almost no decrease in samples ω and (b) of the present invention, whereas that of the prior art (→) has decreased to 5 inches, which shows the remarkable superiority of this invention.

Figure 3 shows the tensile stress elongation characteristics of the film.
The conventional film used in (c) and (e) is shown. (4) has a tensile strength of 16 Kf/■2 or more for an elongation of 5 inches, and that of (B) has a tensile strength of approximately 12 Kt/, m
He is an enemy. Since (4) has high strength, it is possible to increase the winding tension and winding speed when winding the wire.

〔Effect of the invention〕

According to this invention, when the backing film is elongated by 5%,
6 By using a high-strength material with a tensile strength of K9/la2 or more, using a composite mica mixed with organic fibers, and setting the amount of prepreg resin to 8 to 17% by weight, the following effects were obtained. It will be done.

(1) Since a high-tensile film is used, the wire winding tension and winding speed can be increased, so the finished wire is good and has no defects such as tape wrinkles. I can do it.

■Since laminated mica mixed with organic fibers is used, there is no scattering of mica during tape winding work, resulting in good workability and less mica escaping at the corners of the conductor during processing. Furthermore, due to the intertwining of the fibers and mica, the mica pieces are less likely to separate from each other during high-temperature heating, resulting in good thermal stability.

(3) Since the amount of prepreg resin is 8 to 17 weights during the coil forming process during wire hardening or ground insulation treatment, there is no resin pool between the tapes due to resin flow, and the wire insulation layer peels off. , there is no drop in breakdown voltage due to cracks, etc.

Due to the above-mentioned effects, high-voltage rotating machine insulation, high-wire insulation, and static feeders (e.g. high-voltage transformers, linear motors)
It is possible to improve the reliability against surges of windings for use in windings to which particularly high kick pressure is applied, vacuum switches, and the like.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic diagram showing an example of an insulation structure made of prepreg tape of the present invention, and Fig. 2 is a diagram showing experimental results regarding the breakdown voltage retention rate of various insulation chambers. , FIG. 3 is a diagram showing the relationship between the tensile stress and stress characteristics of the film. 1: Conductor, 2: Vertical laminated mica layer, 3: Horizontally wound laminated mica layer.

Claims (1)

[Claims] 1) In an insulated wire made by vertically attaching a film-backed mica prepreg tape to a conductor and wrapping the tape horizontally on the conductor, the film has a tensile strength of 16 K f/mn2 or more at 5% elongation. A high-strength mica with high strength is used, and the laminated mica is mixed with organic fiber, and the amount of resin used for the prepreg resin of the laminated mica prepreg tape is based on the weight of the film and the laminated mica. An insulated wire characterized by having a weight of 8 to 17 ft%.