JPS6016116A - Cooling method of 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 method for cooling power cables using indirect or direct pipe water cooling methods.

"Fig. 71, Fig. 2" schematically shows a conventional indirect pipe water cooling system cable line.

For example, 10 is the top, 14 is the cable and the trough 1 is
It is inserted within 0. 16 is a water-cooled pipe, and 18 is water that circulates within the water-cooled pipe 16. Also, 20 is a water circulation pump, 2
2 is a cooling tower.

Cooled water 18 enters the water-cooled tube 16 through the water-cooled tube inlet 160, gradually increases in temperature by absorbing the heat of the cape/I/14, and exits through the water-cooled tube outlet 162.

A in “Figure #!3” shows the temperature distribution of the water 18 in the water cooling pipe 16. Naturally, the temperature at outlet 162 is the highest, and this temperature limits the power transmission capacity of the cable.

Therefore, there is a proposal to attach cooling fins to the water cooling pipe 16 near the outlet 162. However, if this is done, there is a problem that the space will become large.■ Furthermore, since the temperature of the water 18 near the population of 160 is low, the cable 14 is cooled more than necessary. However, if the temperature of the water 18 near the inlet 160 is increased, the water 18 at the outlet 162
As the temperature exceeds the limit value, the temperature has to be lowered.

Purpose and Structure of the Invention In consideration of the above points, the present invention has been developed by starting from the outlet side position of each cooling section and extending from the outlet side to the inlet side, the length of which is at least 1/20 of the above section. , heat pipe 24
By inserting the cable into the water-cooled pipe, the temperature of the water 18 near the outlet 162 of the water-cooled pipe 16 can be lowered, and the power transmission capacity of the cable 14 can be increased.

The total length of each cooling section (10
The temperature of the water 18 near the outlet 162 of the water-cooled pipe 16 is lowered by inserting a heat pipe 24 into the water-cooled pipe 16 over a distance (0 m = 1000 rn). In other words, the heat pipes 24 inserted into the water-cooled pipes 16 are very long, extending from the inlet 160 to the outlet 162 of each cooling section.The number of heat pipes 24 may be approximately two, but
Sometimes there are three or more.

The heat pipe 24 may be of an ordinary standard type, and the closed container is made of copper, aluminum, stainless steel, etc., and the operating fluid is water, alcohol, etc. The part near the outlet of the heat pipe 24 is It operates as the evaporator 242. That is, like a normal heat pipe, the evaporator 242 removes heat from the high-temperature water 18 to lower the temperature of the water 18.

Then, the temperature of the working fluid in the heat pipe 24 rises and vaporizes, and the vapor flows to near the low temperature inlet 160. The vicinity of the population of the heat pipe 24 operates as a condensing section 240. The heat of condensation is then released to water 18.

The temperature distribution of the water 18 in the water cooling pipe 16 is shown at B and 0 in "Figure 3". Since the temperature of the water 18 near the 0 output RO 162 (when the size of the pipe 24 is large) decreases as described above, the amount of power transmitted by the cable 14 can be increased by that amount.

Note that due to the release of heat from the heat pipe 24) the inlet 16
The temperature of the water 18 near 0 increases. However, as mentioned above, since this is a part where the cable 14 has conventionally been cooled more than necessary, there is no problem in cooling the cable 14 even if the temperature rises a little.

In the above embodiment, the heat pipe was provided over the entire length of the water cooling section, but the heat pipe is not limited to this. A heat pipe having a length of about 1/20 may be provided in the cooling water. In this case, the temperature distribution in the cooling section simply moves from B, 0 in FIG. 3 to B', ri in the figure. Furthermore, it goes without saying that the refrigerant is not limited to water, but may also be oil or the like.

Furthermore, in the present invention, the case where the electric power cable is laid in the trough has been described, but the place where the electric power cable is laid is not limited to the inside of the trough. It's okay.

Effects of the invention (1) Water 1 near the outlet 162 by the heat pipe 24
Since the temperature of cable 8 decreases, the power transmission capacity of cable 14 can be increased as described above.

L2) Since cooling fins are not required, space can be saved.

[Brief explanation of the drawing]

FIG. 7 is an explanatory diagram of a conventional pipe indirect water cooling system, FIG. 2 is an explanatory diagram of its cross section, FIG. 3 is a temperature distribution diagram of water 18 in water cooling pipe 16 in the conventional and present invention cases, Figure q is a detailed explanatory diagram of the present invention, and Fig. 3 is an explanatory diagram of its cross section. 14: Cable 16: Water cooling pipe 18: Water 24: Heat pipe Patent applicant: Fujikura Electric Cable Co., Ltd. Representative: Keiji Kunate

Claims (1)

[Claims] In a method of cooling an electric power cable in which an electric power cable is cooled by a refrigerant in a section where the electric power cable is laid, which has an inlet and an outlet, starting from a position on the outlet side of the section and moving from the outlet side to the inlet side. , a method for cooling a power cable in which a heat pipe having a length of at least 1/20 of the section length is provided in the refrigerant to cool the power cable.