JPS6332010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling cable line capable of cooling power cables laid within a conduit.

As the demand for electricity increases, 500KV class ultra-high voltage power transmission has been realized, and even 1000KV class ultra high voltage power transmission is being planned.

Conventionally, in order to increase the power transmission capacity of such power cables, a refrigerant passage is provided inside or outside the conductor, and the refrigerant is circulated through the passage to exchange heat between the conductor and the refrigerant. The cooling method was generally adopted, but since the refrigerant flows in the longitudinal direction of the cable, even if the temperature of the refrigerant itself is low at first, it gradually becomes hotter, and the heat in the longitudinal direction of the cable increases. As a result of the gradual decrease in exchange capacity, the temperature becomes non-uniform in the longitudinal direction considering the entire length of the cable, resulting in a disadvantage of poor cooling efficiency.

The present invention has been made in view of the above-mentioned circumstances, and involves disposing a cable in a sealed conduit and filling it with a refrigerant, and disposing such a conduit in a conduit having a large outer diameter. , a cooling cable line is created in which low-temperature air is circulated through the space between the conduit and the sealed conduit, whereby the refrigerant absorbs heat from the cable surface and vaporizes, cooling the cable itself and vaporizing it. This is a cooling cable line that exchanges heat between the refrigerant and the low-temperature air flowing outside the sealed tube, liquefying the refrigerant again.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the cooling cable line of the present invention. Wrap absorbent tape 2 such as plastic and store it in a sealed tube 4, and add an appropriate amount of refrigerant 3 such as water or chlorofluorocarbons.
to store. If this absorbent tape 2 exists, it will more effectively wrap the cable around the refrigerant, so it is advantageous for cooling the cable.
If there are three cables, they may be provided for each cable instead of all at once. This structure is housed in the pipe 5, and low-temperature air is passed through the space between the sealed pipe 3 and the pipe 5.

FIG. 2 is a longitudinal sectional view showing an example of the relationship with a cooling device.

Absorbent tape is wrapped around the surface of the cable 1, and the cable 1 is placed in a sealed tube 4. Note that an appropriate amount of refrigerant 3 is put into the sealed tube 4. Packings 4-2 and 5- are installed at the cable lead-in and exit ends of the sealed pipe and conduit 5.
2 and is configured airtight.

One end of the above pipe 5 is connected to an expansion valve V, and a condenser C and a compressor A are provided beyond that, and a pump P is provided in one passage of the heat exchange pipe for the condenser C. A cool ring tower T is attached. The other end of the conduit 5 is adapted to exhaust air upwardly.

Therefore, the air in the atmosphere is compressed by the compressor A, cooled by the condenser C, rapidly expanded by the expansion valve V, and passed through the pipe 5.In the pipe 5, the temperature of the cable decreases. As it rises, the refrigerant 3 takes away the heat from the cable in the sealed tube 4 and vaporizes.
It is repeatedly cooled and condensed by cold air passing through the closed tube, returning to a liquid state.

Therefore, according to the present invention, since the coolant flows in the radial direction, there is no temperature non-uniformity in the longitudinal direction of the cable, and the cable is cooled uniformly. In addition, when water is used as a refrigerant, safety can be ensured even if there is a failure in the pump, valve, etc., or leakage from the sealed pipe due to deterioration of the packing, etc., and it is safe not only for the human body but also for the environment. No risk of contamination arises. Further, since the low temperature air required for condensing the refrigerant is supplied from one end of the pipe A and released into the atmosphere from the other end, various effects such as eliminating the need for a return pipe can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a cooling cable line according to the present invention, and FIG. 2 is a longitudinal cross-sectional view with a partial block diagram showing the relationship between the cooling cable line of the present invention and low-temperature air supply equipment, etc. be. 1... Cable, 3... Refrigerant, 4... Sealed tube,
5... Conduit.

Claims (1)

[Claims] 1. Cooling characterized in that the cable and refrigerant are arranged in a sealed pipe, the sealed pipe is arranged in a relatively large pipe, and low-temperature air is circulated between the pipe and the sealed pipe. cable line.