JPS598127B2 - Forced cooling method for power cables - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A method of using a compression refrigerator for forced cooling of power cables is known.

However, when the capacity of the transmission line increases, the cost of electricity to operate the compressor increases significantly.

The present invention eliminates the above problems by using an absorption refrigeration system.

First, a known absorption refrigerating device will be briefly explained.

In FIG. 1, 11 is a generator.

Therein, a concentrated solution 12 of refrigerant (eg, ammonia) is heated, such as by steam 14, and refrigerant vapor 120 is generated.

16 is a condenser.

Refrigerant vapor 120 is cooled here and becomes liquefied refrigerant 121
become.

20 is a cooler.

The inside is kept in a vacuum.

The liquefied refrigerant 121 is injected into this through the expansion valve 18,
Evaporate and cool the brine 22.

24 is an absorber.

Refrigerant vapor 120 after cooling brine 22 is directed therein.

On the other hand, in the generator 11 , the dilute refrigerant solution 122 after evaporating the refrigerant vapor 120 is led into this absorber 24 .

It then absorbs the refrigerant gas sent from the cooler and becomes a thick solution.

This concentrated solution 12 is sent back to the generator 11.

Repeat this below.

In the case where oil in an oil-filled cable or water in a water-cooled cable is cooled by the absorption refrigeration system described above, the present invention uses oil whose temperature has increased due to conductor heat generation as a heating source for the refrigerant solution 12 in the generator 11. It is designed to utilize the heat of water.

Example 1 (Figure 2) Reference numeral 10 indicates the entire absorption refrigerating apparatus.

30 is a cable, for example a POF cable.

32 is an oil supply device thereof, and 34 is a pump for circulating the oil 36.

Inside the cable 30, the temperature of the oil rises to about 50-60°C.

It is introduced into a generator 11 which heats the refrigerant solution 12 to generate refrigerant vapor 120.

Heating the solution 12 lowers the temperature of the oil 36.

It is further cooled by a cooler 20.

In this case, the brine 22 is not used, and the oil 36 is directly cooled to about 20 to 25° C., and then fed into the cable 30 again.

Embodiment 2 (FIG. 3) This is a case where indirect cooling is performed using heat exchangers 38 and 48 and a heat storage tank 46.

In the heat exchanger 38, water 40 is heated with the high temperature oil 36 led out from the cable 30, and the hot water is used to heat the generator 1.
Refrigerant solution 12 of No. 1 is heated to generate refrigerant vapor 120.

In addition, in the cooler 20, water 44 (brine 2 in FIG.
(equivalent to 2).

On the other hand, a large amount of water is stored in the heat storage tank 46, which stores heat.

The inside thereof is divided into a cold area 462 and a warm area 463 by a partition wall 461 having a small passage 460, for example.

The water 44 cooled by the cooler 20K once enters the cold water area 462 where the heat is stored.

The oil 36 is then sent to the heat exchanger 48 to further cool the oil 36 (the temperature of which has been lowered by applying heat to the water 40 in the heat exchanger 38).

The water 44, whose temperature has increased by cooling the oil 36, returns to the heated area 463 of the heat storage area, is sent from there to the cooler 20, is cooled, and enters the cold area 462 of the heat storage area.

Repeat this below.

By using the heat storage tank 46, even when the operation of the refrigeration system 10 is stopped (including failure), cooling of the cable 30 can be continued for a considerable period of time using a large amount of cold water stored therein.

Effects (1) Since there is no machine that consumes a large amount of electricity like the compressor of a compression refrigerating machine, operating electricity costs are significantly reduced.

(2) Since oil to be cooled or the like is used as the heat source in the generator 11, it is economical.

(3) The temperature of objects to be cooled, such as oil, decreases when used as a heat source.

Therefore, the amount of heat absorbed by the cooler 20 can be reduced accordingly.

[Brief explanation of drawings]

Figure 1 is a general explanatory diagram of absorption refrigeration equipment, Figures 2 and 3
The figures are explanatory diagrams of different embodiments of the present invention. 10... Absorption refrigeration device, 11... Generator, 16... Condenser, 20... Cooler, 24... Absorption vessel, 30...cable, 38...heat exchanger, 46...heat storage, 48...heat exchanger.

Claims (1)

[Claims] 1. Leading oil or water whose temperature has increased to the outside of the cable, thereby heating a solution in a generator of an absorption refrigeration system, and heating the oil or water whose temperature has decreased by heating the solution. A forced cooling method for a power cable, characterized in that the power cable is further cooled by a cooler of an absorption refrigerating device and then fed into the cable again.