JPS5894707A - Oil-immersed paper insulated power cable - 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 The present invention relates to an improvement of an oil-impregnated paper insulation type cable.

FIG. 1 shows the entire cross-sectional structure of an example of a conventional oil-impregnated paper insulated cable. In the figure, reference numeral 2 denotes a spiral body of zinc-plated copper band.A hollow conductor is formed by twisting a plurality of divided conductor bars 3, each of which is partially wrapped with kraft paper 4, around the outer periphery of this spiral body 2. The inside of the spiral body 2 is used as an oil passage l.

A binder tape 5 is wrapped around the outer periphery of the twisted hollow conductor, a carbon paper tape 6 and a metallized paper tape 7 are wrapped around the outer periphery to form an inner shield, and an insulating layer 8 of kraft paper tape is formed around the outer periphery. , a metallized paper tape 9 and a carbon tape paper IO are wrapped around the outer periphery of the layer to form an outer shield, and a copper wire woven cloth tape LL' is wrapped around the outer periphery of the double layer, and this copper A corrugated aluminum coating 12 is applied to the outside of the line-woven cloth tape 11, a paint 13 is applied to the outer surface of the corrugated aluminum coating 12, and a PVC anticorrosion layer 14 is further formed on the surface. And dry the cable configured in this way,
If it is degassed and filled with insulating oil, an oil-impregnated paper insulation type capeple will be created.

Note that in the above configuration, some configurations such as the inner shield, outer shield, etc. may be changed.

By the way, due to the manufacturing process, an oil layer is formed between the layer of copper wire woven cloth 11 and the corrugated aluminum coating 12.

Complete contact cannot be expected. Also, copper wire woven cloth tape 11
Since the thermal conductivity of the copper-woven cloth tape 11 is poor even in the area where the conductor and the corrugated aluminum sheathing 12 are in contact, the thermal resistance between the internal conductor and the corrugated aluminum sheathing increases, resulting in conductor loss and dielectric loss. Due to body losses, a large temperature difference occurs between the conductor and the corrugated aluminum coating. Therefore, even if the outside of the cable is cooled, the temperature difference within the cable cannot be reduced, and the power transmission capacity is limited.

Therefore, in the present invention, instead of using the above-mentioned copper wire woven cloth tape, we cleverly use a cloth tape coated with metal paint or a metal-deposited film to solve the above-mentioned thermal problem. , which aims to increase power transmission capacity.

The embodiments shown in the drawings will be described below.

Second @ is a partial longitudinal cross-section of the shield layer and the like wound around the outer periphery of the insulating layer. This embodiment is an example of winding with metallic paint-coated cloth tape.

In the figure, numeral 8 indicates an insulation lIl wound with kraft paper or the like. Aluminum in the longitudinal direction of the outer circumference of insulation Ill 8
E7 is wound together with metallized paper tape 15 and carbon paper tape 16 to form a combined layer 17'! il
- A layer 19 is formed in the longitudinal direction of the outer periphery by overlapping the metal-coated surfaces of the metal-coated cloth tape 18 coated with a metal coating. With such a configuration, the aluminum tape or metallized paper tape 15 and the metal coated surface of the metal paint coated cloth tape 18 come into contact alternately, and the metal coated surface of the metal paint coated cloth tape 18 is not shown. However, they also alternately contact the corrugated aluminum coating 12 applied on the outside thereof.

FIG. 8 shows a partially longitudinal section of an embodiment in which the metallized film is wound with tape.

Similar to the embodiment shown in FIG. 2, aluminum tape or metallized paper tape 15 and carbon paper tape 16 are wrapped around the outer circumference of the insulating layer 8 in the longitudinal direction to form a wrap layer 1.
7 is formed, and a layer 2+i is formed by overlapping the metal-deposited surface of a perforated tape 20 in which gold S is deposited on one side of a polyethylene terephthalate (trade name: Mylar) film and winding it in the longitudinal direction of the outer circumference. With this kind of configuration,
The metal-deposited surfaces of the aluminum tape or metallized paper tape 15 and the metal-deposited polyethylene terephthalate tape 20 alternately contact each other, and although this metal-deposited surface is not shown, it also contacts the corrugated aluminum coating 12 applied on the outside. Alternate contact.

Note that aluminum is suitable as the metal vapor deposit, and a material containing aluminum or copper is suitable as the metal paint.

Furthermore, the above-mentioned corrugated aluminum coating, paint, and P are applied on top of these layers.
Needless to say, the application of a vC anti-corrosion layer, etc., and the construction of conductors and insulation layers are similar to those described in FIG.

According to the insulation thermal resistance measurement results of this type of OF cable as shown in Figure 1, the thermal resistance p ('C9,/W) between the internal conductor and the external aluminum sheath is approximately p = 60.
0 to 700°C, cm/W, but according to the invention, it is expected that p=550°C, cm/W, and it is thought that this will improve the power transmission capacity by about 996 points.

As explained above, according to the present invention, since the cloth tape coated with metal paint or the metal evaporated film 4) comes into contact with the corrugated aluminum coating and the shield layer, thermal contact is good and the conductor The thermal resistance between the conductor and the corrugated aluminum coating is reduced, the temperature difference between the conductor and the aluminum coating is also reduced, and the power transmission capacity can be increased.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional structure of an example of a conventional oil-impregnated paper insulation type capeple. 2 and 3 show partial longitudinal sections of embodiments of the invention. 1...Oil passage, 2...Zinc-plated copper band spiral body, 3
...Divided conductor section, 4...Craft paper, 5...No(
Inner tape, 6... Carbon paper tape, 7...
Metallized paper tape, 8... Insulating layer, 9... Metallized paper tape, lO... Carbon paper tape, 11... Copper wire woven cloth tape, 12... Corrugated aluminum coating, 18... Paint, 14... PVC anticorrosion +d, ts..." Aluminum tape or metallized paper tape, 16... Carbon paper tape, 17... Layered layer as shield layer, l8.
...Metallic paint coated cloth tape, 19... Layered layer of metal paint coated cloth tape, 20...Metal vapor deposited tape,
21... Layered layer made of metallized tape. 71 Figure 3℃ −・Yoshi 2 Figure Δ Old Yoshi 3 Figure/3 ゝ10

Claims (2)

[Claims] (1) An oil-impregnated paper-insulated capeple characterized in that a cloth tape coated with metal paint or a metal-deposited film tape is wrapped between the shield on the insulation layer of the oil-impregnated paper-insulated capeple and the corrugated aluminum coating. . (2) The oil-impregnated paper insulated capeple according to claim 1, characterized in that the metal surfaces of cloth tape or metallized film tape coated with metal paint are overlapped and wound together.