JPH01123407A - Transformer - Google Patents

Abstract

PURPOSE:To simplify the connecting work of joints and to prevent decrease in cooling performance, by providing a heater, which heats an endothermic part and increases internal pressure when a heat radiating part and the endothermic part are coupled in a tank. CONSTITUTION:In a tank 11, a heater 20, which heats an endothermic part 14 and increases the internal pressure of the part when a heat radiating part 15 and the endothermic part 14 are coupled. A heater 21, which is prepared by a worker, is provided in the heat radiating part 15. The endothermic part 14 is heated with the heater 20 and temperature is increased. Then, liquid refrigerant in the endothermic part 14 is evaporated, and the internal pressure is increased. The heat radiating part 15 is heated with the heater 21, and the temperature is increased. Then, liquid refrigerant in the heat radiating part 15 is evaporated, and the internal pressure is increased. Joint elements 18b and 19b of coupling and decoupling joints 18 and 19 are coupled with joint elements 18a and 19a. Thus, the heat radiating part 15 is coupled with the endothermic part 14. Thus, the connecting work of the joints 18 and 19 becomes simple, and the decrease in cooling performance is prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a heat pipe type cooling system in which a heat absorbing part housed in a tank and a heat radiating part arranged outside the tank are connected by a joint. Concerning a transformer with a device.

(Prior Art) Conventionally, as a cooling device for a transformer that generates a large amount of heat, a separate heat pipe type heat exchanger that can transport a large amount of heat has been used. Here, a separate heat pipe is a pipe that forms a closed loop, with an air passageway for the refrigerant gasified in the heat absorption part to flow to the heat radiation part, and an air passageway for the refrigerant liquefied in the heat radiation part to flow to the heat absorption part. The liquid passage is configured separately, and this prevents the so-called flooding phenomenon in which the gas refrigerant and the liquid refrigerant collide with each other and inhibits the circulation of the refrigerant, thereby increasing the amount of heat transported.

When such a cooling device is applied to an underground transformer, the tank is buried underground and the heat dissipation section is installed above ground, so that there is a gap between the heat absorption section installed inside the tank and the heat dissipation section above ground. The lengths of the connecting pipes constituting the air supply passage and the liquid supply passage become longer in accordance with the positions of the tank and the heat radiating section, and the transport volume of the transformer as a whole becomes very large. Therefore, in general,
The connecting pipe is divided in the middle, the tank and the heat dissipation part are transported separately, and the two are connected at the installation site using removable pipe fittings with automatic sealing mechanisms attached to each connecting pipe. This conventional example is shown in FIG.

That is, 1 is a tank buried underground that accommodates the transformer contents 2, and contains insulating oil 1a as a cooling medium inside. 3 is a heat absorbing part of the heat vibrator arranged inside the tank 1, 4 is a heat radiating part of the same heat vibe arranged outside the tank 1, and the heat absorbing part 3 and the heat radiating part 4 are connected to the air supply road and the They are connected by an air supply side connecting pipe 5 and a liquid supply side connecting pipe 6, which constitute a liquid passage, and are configured in a closed loop shape as a whole.

The reconnecting pipes 5 and 6 are divided into upper and lower parts near the outside of the upper part of the tank 1, and the heat dissipation is performed between the lower air supply side connecting pipe 5a on the heat absorption part 3 side and the upper air supply side connecting pipe 5b on the heat radiating part 4 side. The liquid sending side connecting pipe 6a on the side of the section 4 and the lower harmonic connecting pipe 6b on the side of the heat absorbing section 3 are removably connected by pipe joints 7 and 8, respectively. Reference numeral 9 denotes an air vent valve provided in the heat radiation section 4. Inside the cooling device consisting of this heat-vib type heat exchanger, after the heat absorption part 3 and the heat radiation part 4 are sucked into a highly vacuum state, a refrigerant such as a Freon refrigerant (CtF, CI, etc.) is sealed. , this refrigerant is circulated as shown by the arrow in FIG. It has become.

(Problems to be Solved by the Invention) In the configuration described above, when the heat dissipating section 4 is separated from the heat absorbing section 3 and transported, and then reconnected at the installation site of the transformer,
Both are at room temperature and maintain equilibrium in the gas and liquid phases with vapor pressures that correspond to the temperature at that time, and both vapor pressures are negative pressures that are smaller than atmospheric pressure. . Therefore, when connecting the pipe fittings 7.8, there is a problem that a small amount of air is sucked into the cooling device and mixed into the refrigerant, reducing the cooling performance. In order to prevent this decrease in cooling performance, after connecting the pipe joints 7 and 8, the transformer is test run to increase the temperature of the heat absorbing section 3 and the heat dissipating section 4 and increase the internal pressure to positive pressure. Air is discharged from the air vent valve 9 together with a part of the refrigerant. However, in this case, a larger amount of refrigerant than necessary must be sealed, and the amount of refrigerant released depends on the relationship with the valve opening time, temperature, characteristics of the vent valve 9, etc. However, since air may remain even after the refrigerant is discharged, a cooling characteristic test of the cooling device must be conducted afterwards.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a transformer in which a heat absorbing part and a heat radiating part are configured to be removable by means of a joint, which can prevent air from entering when the joints are connected as much as possible, thereby preventing deterioration in cooling performance. There is something to do.

[Structure of the Invention] (Means for Solving the Problems) The transformer of the present invention has a heat absorbing part disposed inside a tank containing the contents of the transformer and having an outlet part and an artificial part, and a heat absorbing part disposed outside the tank. A heat radiating part having an outlet part and an inlet part, the outlet part of the heat radiating part and the inlet part of the heat absorbing part, and the outlet part of the heat absorbing part and the inlet part of the heat radiating part are connected by joints to circulate the refrigerant sealed inside. The tank is characterized in that a heating device is provided in the tank to heat the heat absorbing part and increase the internal pressure when the heat radiating part and the heat absorbing part are connected.

(Function) In the transformer cooling device of the present invention, when the heat radiating part and the heat absorbing part are connected by a joint, the heat absorbing part is heated by the heating device in the tank to increase its internal pressure. Air is not sucked into the unit and the cooling characteristics do not deteriorate.

(Example) Hereinafter, an example in which the present invention is applied to an underground transformer will be described with reference to FIG.

Reference numeral 11 denotes a tank buried underground and containing the transformer contents 12, and contains insulating oil 11a as a cooling medium inside. Reference numeral 13 denotes a heat-vib type cooling device for cooling the insulating oil 11a, which consists of a heat absorbing section 14 disposed within the tank 11 and a heat dissipating section 1-5 disposed on the ground. The heat absorbing section 14 and the heat dissipating section 15 are connected by an air supply side connection pipe 16 and a liquid supply side connection pipe 17 that constitute an air supply passage and a liquid supply passage, and are configured in a closed loop as a whole. and,
Both connecting pipes 1δ and 17 are divided into upper and lower parts near the outside of the upper part of the tank 11, and connect the upper end of the lower air supply side connecting pipe 16a as a refrigerant outlet of the heat absorption part 14 with the upper end of the lower air supply side connecting pipe 16a as a refrigerant outlet of the heat radiating part 4. between the lower end of the pipe 16b and the lower end of the upper liquid feeding side connecting pipe 17a as the refrigerant outlet of the heat radiating section 15 and the one end of the lower wave harmonic connecting pipe 17b as the refrigerant inlet of the heat absorbing section 14, respectively. They are removably connected by detachable pipe joints 18 and 19 with automatic sealing mechanisms as joints. These detachable pipe joints 18 and 19 are a pair of joint elements 18a, each of which has a self-sealing valve mechanism, although not shown.

18b, 19a, and 19b, and when each pair of coupling elements 18a, 18b and 19a, 19b are connected, each valve mechanism is opened and the two are in communication state, and when they are separated, the valve mechanism is in communication state. It's set to close.

Now, 20 is a heater as a heating device disposed in the tank 11, and this is the lower wave transmission harmonic connecting pipe 17 of the heat absorption part 14.
It surrounds the lower part of the tank 11, and can be controlled to turn on or off from the outside of the tank 11.

Next, the action of 1-styl structural acid will be explained. First, after the completion test of the transformer at the manufacturing factory, the joint cords 18a, 18b and 19a, 19b of the removable pipe joints 18 and 19 are separated while the inside of the heat pipe cooling device 13 is under positive pressure. , the heat dissipation section 15 is separated from the heat absorption section 14. After transporting the tank 11 to the transformer installation site and burying it underground, the two joint cords 18a, 18b, and 19a of the two detachable pipe joints 18 and 19 are connected to the heat absorption part 14 and the heat radiation part 15.

19b facing each other, and a heater 21 prepared by an operator is installed so as to surround the lower part of the upper liquid feeding side connecting pipe 17a of the heat radiation part 15, for example. Then, the heaters 20 and 21 are energized. Then, because the heat absorbing part 14 and the heat radiating part 15 are at room temperature, liquid refrigerant is accumulated in the lower part of each of them to varying degrees, so the heat absorbing part 14 is heated by the heater 20 and the temperature rises. In response to this, the liquid refrigerant in the heat absorption part 14 evaporates and the internal pressure rises, and at the same time the heat radiation part 15 is heated by the heater 21 and the temperature rises. Refrigerant evaporates and internal pressure increases. Inside the heat absorption part 14 and the heat radiation part 15
When the internal pressure inside increases to positive pressure, the joint elements 1111b and 19b of the detachable pipe joints 18 and 19 are connected to the joint cord 18a and the joint 9a, thereby connecting the heat dissipation section 15 to the heat absorption section 14. do. Note that whether or not the pressure has become positive depends on the power consumption of the heater 20.21 or the heat absorption section 14. This can be determined by measuring the temperature of the heat radiation section 15.

When the detachable pipe joints 18 and 19 are connected, the internal pressure inside the heat radiation part 15 and the heat absorption part 14 is positive, so
External air is not sucked into the heat absorbing section 14 and the heat dissipating section 15. On the other hand, although a small amount of internal refrigerant is released to the outside, it is not enough to deteriorate the cooling characteristics.

[Effects of the Invention] As is clear from the above description, the present invention has the following advantages:
Since a heater is provided that heats the heat absorbing part and increases its internal pressure when the heat radiating part and the heat absorbing part are connected, the joint connection work is simple and a decrease in cooling performance can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment in which the present invention is applied to a cooling device for an underground transformer, and FIG. 2 is a diagram corresponding to FIG. 1 of a conventional example. In the figure, 11 is a tank, 12 is a transformer, 13 is a cooling device,
Reference numeral 14 indicates a heat absorber, 15 indicates a heat radiating section, 18 and 19 indicate detachable pipe joints, and 20 indicates a heater (heating device).

Claims (1)

[Claims] 1. It consists of a heat absorbing part disposed inside a tank containing the contents of the transformer and having an outlet part and an inlet part, and a heat dissipating part disposed outside the tank and having an outlet part and an inlet part, the outlet part and the heat absorbing part of the heat dissipating part. In the heat pipe type cooling device, the inlet part of the heat absorbing part, the outlet part of the heat absorbing part, and the inlet part of the heat radiating part are connected by joints to circulate the refrigerant sealed inside, wherein the heat radiating part is in the tank. 1. A transformer comprising a heating device that heats the heat absorbing part to increase internal pressure when the heat absorbing part and the heat absorbing part are connected.