JPS5859513A - Method of cooling 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 a cooling method for a power cable useful in increasing the power transmission capacity of the power cable.

Conventionally, as a cooling method for power cables, as shown in Fig. 1, a skid wire 4 is spirally wound around an inner passage 2 provided in the center of a conductor 1 and an insulator 3, and an aluminum wire is wrapped on top of the internal passage 2 provided in the center of the conductor 1. A method is known in which a refrigerant 7 is forcibly circulated through an external passage 6 formed by providing a sheath 5.

However, in this cooling method, although the outer surface side of the cable insulator 3 and the center side of the cable insulator 3 are efficiently cooled, there is a drawback that the inner part of the insulator 3 is not sufficiently cooled. . Therefore, as a cooling method for a power canal pull, where the allowable temperature range of the cable depends on the thermal characteristics of the insulator, there is a problem in that the power transmission capacity is reduced accordingly.

The present invention has been made to solve this problem, and provides a cooling method for a hanging electric cable that increases the power transmission capacity of the cable by efficiently cooling the unit itself, which is the heat source, from inside and outside. It is something to do.

Hereinafter, the present invention will be explained based on the drawings of 74 examples.

In Figure 2, in which the same parts as in Figure 1 are given the same numbers,
A skid wire 4' is spirally wound around the outer periphery of the integral body 1 having an internal passage 2 in the center, and a shield 14 and a pole 8 are provided on the skid wire 4'. (Hereinafter, conductor 1
The gap between the electrode layer 8 and the electrode layer 8 is abbreviated as an external passage 6'. ) An insulator 3 formed by winding oil-impregnated paper tape or extruding rubber or plastic material is placed around the outer periphery of the electrode Ns8.
' is provided, and above this is provided [#l'iW9.

The formation of the external passage 6' is not limited to that shown in FIG. 2; for example, as shown in FIG. Alternatively, as shown in FIG. 4, for example, the integral body 1 may be formed by dipping a W groove 10 on the inner periphery with an electrode layer 8'.

The electrodes 8, 8', and 8' are formed by spirally winding (non-sealed configuration) a metal pipe 2 (t5flltt) made of aluminum or the like or stainless steel tape, and an insulator provided thereon and the following. Either a sealed type or a non-sealed type is selected depending on the type of refrigerant.

A refrigerant 7' made of an insulating fluid such as insulating oil, pure water, or chlorofluorocarbon is forcedly circulated in the inner and outer passages 2 and 6', and the storage body 1 is efficiently cooled from the inside and outside by this refrigerant.

The table below shows cable types and electrode layer IIIvti,
This shows examples of how different refrigerants are used.

Figure 5 shows the outside of the koji at one end of the electric cable.
An actual example is shown in which refrigerant γ is forcibly circulated from the hook at the other end of the cable to each of the inner and outer passages 2 and 6' with the passage 6' being connected to ai+. In this embodiment, the refrigerant '1' flowing into the outer Km path 6' follows the inside of the conductor 1 as indicated by the arrow and flows into the non-sealed internal passage 2.
There is an advantage that the conductor 1 is cooled entirely. Note that, instead of closing the external passage, one end of the inner utt++ M may be opened and the refrigerant may be forcedly circulated in the same manner as described above, with the same cooling effect.

Figure 6 shows a tll formed of a porous material such as Teflon 'I'PFlii, which allows gas to pass through the inner periphery of the conductor 1 (or the outer periphery of the conductor), but does not allow liquid to pass through.
An embodiment is shown in which a gas-liquid mixed fluid 12 such as fluorocarbon is filled in this pipe.

In this example, the refrigerant is vaporized by the heat generated by the conductor, and the vaporized refrigerant flows into the external passage through the conductor, so that the cooling effect is further improved.

As described above, in the present invention, since the conductor itself, which is the source of heat generation, is cooled from the inside and outside, there is almost no thermal influence on the conductor itself, which greatly increases the power supply of the power cable. Can do 0

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional internal cooling cable, Fig. 2 is a sectional view of a power cable according to the present invention, and Fig. 3-4 is a sectional view showing another embodiment of the electric power cable according to the present invention. Figure, 5th
, 6 is an explanatory diagram showing the flow state of refrigerant in the power cable according to the present invention.
Conductor 2-11~-----Inner S passage 3, ff-
-------Skid wire 4, 4' ---Skid wire 6, 6'
-------・External passage 7, 7'-1---------Refrigerant 8.8', 8'----14 is explained by the patent attorney Yama 1) Akira Shin (1, -

Claims (1)

[Claims] 1./JJ An internal passage provided at the center of the body and an external passage formed by the structure and an electrode layer provided with a required gap on the outer periphery of the body.