JPH017940Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to POF cables among power cables.

Conventional Technology As is well known, POF cables house a cable core in a steel pipe, fill the steel pipe with insulating oil, and apply a pressure of more than ten atmospheres to the insulating oil to eliminate voids caused by expansion and contraction of the insulating oil. The structure is designed to suppress the generation of voids, and to suppress ionization by increasing the internal pressure of voids even if they occur.

Problems that the invention aims to solve With such a cable, it is possible to increase the power transmission capacity by circulating insulating oil for cooling; A pumping plant consisting of a pump, oil storage tank, valves, etc. is required for the system, and maintenance and inspection must be carried out frequently, so although the power transmission capacity can be set high, the equipment becomes complicated and expensive. Moreover, there were problems such as increased running costs.

The purpose of this invention is to provide a POF cable that can effectively solve the above problems.

Means for Solving the Problems In order to achieve the above object, this invention accommodates a cable core in a steel pipe, fills the steel pipe with insulating oil, and installs a heat pipe along the cable core. and disposed within the steel pipe,
One end of the heat pipe is configured to protrude from the steel pipe toward its outer circumference.

Function The cable core generates heat as power is transmitted, but that heat is transmitted to the heat pipe via oil, and as a result, the working fluid inside the heat pipe evaporates and the steam protrudes to the outer circumference of the steel pipe. The liquid flows to the end where it condenses and liquefies by dissipating heat. That is, the heat accompanying power transmission is sent out to the outside by the heat pipe, and as a result, the cable is cooled.

Embodiment An embodiment of this invention will be described below with reference to the drawings.The cable 1 is made of a steel pipe 11 with a conductor insulated inside, similar to the conventional POF cable.
The main cable core 12 is accommodated, and the steel pipe 11
The inner space is filled with insulating oil 13, and a plurality of heat pipes 2 are arranged inside the steel pipe 11 along the cable core 12, one end of which is bent at a substantially right angle. steel pipe 11
The heat dissipating portion 21 extends through the heat dissipating portion 21 and protrudes toward the outer periphery thereof. Here, the heat pipe 2 is preferably as long as possible, and for example, as shown in FIG. A compartment is formed, and a box 2 is placed in each sealed room 24.
The heat pipe 2 has a structure in which a suitable working fluid such as water is sealed in the steel pipe 1 so as not to interfere with the drawing work.
It is held by a spacer (not shown) so as to be located slightly above the central axis of the interior of the holder. Note that the portion where the heat pipe 2 penetrates the peripheral wall of the steel pipe 11 is completely sealed to prevent leakage of the insulating oil 13. Furthermore, in use, the heat dissipation section 21 may be simply buried underground, but if there is a risk that heat may accumulate in the ground around the heat dissipation section 21 and the heat dissipation effect may be hindered, In the case where a large number of fins are attached to the heat dissipation part 21 to dissipate heat over a wider range, or when the cable 1 is installed in a tunnel and the heat dissipation part 21 is located in the tunnel accordingly,
It is also possible to attach a large number of fins to the heat radiating section 21 and to provide a ventilation fan that flows the air around the heat radiating section 21.

As is clear from the above configuration, heat generated in the cable core 12 during power transmission is transferred to the insulating oil 13.
The heat is transmitted to the heat pipe 2 via the heat pipe 2, and the working fluid in the heat pipe 2 circulates while repeating evaporation and condensation, thereby transporting the heat to the heat radiation section 21,
Since heat is dissipated from here to the outside of the cable 1, the cable 1 is actively cooled without circulating the insulating oil 13, and at the same time, it is possible to prevent the occurrence of hot spots due to locally large thermal resistance of the ground. can.

Effects of the invention As is clear from the above explanation, the POF of this invention
According to the cable, a heat pipe is arranged along the cable core within a steel pipe that accommodates the cable core, and one end of the heat pipe is made to protrude toward the outer circumferential side of the steel pipe as a heat dissipation part. , it is possible to cool the insulating oil filled in the steel pipe without specifically circulating it, thus eliminating the equipment required to circulate the insulating fluid, simplifying the equipment and reducing running costs. can be made cheaper,
Furthermore, the heat pipe has a semi-permanent lifespan, is maintenance free, and has no failures.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of this invention, Fig. 2 is a perspective view showing an enlarged part of the heat pipe, and Fig. 3 is a partially omitted longitudinal cross-sectional view showing an example of the heat pipe. It is. 1... Cable, 11... Steel pipe, 12... Cable core, 13... Insulating oil, 2... Heat pipe, 22... Container, 23... Partition plate, 24... Sealed room, 25... Utsuk.

Claims (1)

[Scope of utility model registration request] A cable core is housed in a steel pipe, and the steel pipe is filled with insulating oil, and a heat pipe is disposed within the steel pipe along the cable core, and one end of the heat pipe is separated from the steel pipe. Characterized by protruding toward the outer periphery
POF cable.