JPH01128416A - Transformer - Google Patents

Abstract

PURPOSE:To prevent mixing of air to the utmost when couplings are connected and avoid the lowering of a cooling performance, by providing interrupting valves in the vicinity of respective couplings which connect a heat radiation part to a heat absorption part. CONSTITUTION:When this device is heated by a heater 24 and its temperature rises, resultant vaporization of an internal liquid cooling medium allows internal pressure to rise. Then, when its pressure becomes positive, removable tube couplings are connected to open interrupting valves 20-23 and a heat radiation part 15 is connected to a heat absorption part 14. In this way, as internal pressure between respective coupling elements and respective interrupting valves 20-23 become positive in the case where coupling elements 18b and 19b of the removable tube couplings 18 and 19 are connected to the coupling elements 18a and 19a, no external air is sucked between respective coupling elements 18a, 18b, 19a, and 19b and respective interrupting valves 20-23. Thus, even if the interrupting valves 20-23 are opened, no air is sucked in the heat absorption part 14 as well as in the heat radiation part 15.

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 with a large amount of heat transport has been used. Here, a separate type heat vibrator consists of a closed loop with pipes, an air supply passage for flowing the refrigerant gasified in the heat absorption part to the heat radiation part, and a flow passage for flowing the refrigerant liquefied in the heat radiation part to the heat absorption part. This structure prevents the so-called flooding phenomenon in which the gas refrigerant and the liquid refrigerant collide with each other and obstructs the circulation of the refrigerant, increasing the amount of heat transported. It is something. 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 length of the connecting pipes constituting the air supply road and the liquid supply passage becomes 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 radiator are transported separately, and the two are connected at the installation site using a removable pipe joint with an automatic sealing mechanism attached to each connecting pipe. I try to stay calm. 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 the heat absorption part of the heat pipe arranged inside the tank 1, 4 is the heat radiation part of the same heat vibrate arranged outside the tank 1, and the heat absorption part 3 and the heat radiation 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.

Both connecting pipes 5 and 6 are divided into upper and lower parts near the outside of the upper part of the tank 1, and 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, heat is radiated. The upper liquid feeding side connecting pipe 6a on the side of the section 4 and the lower liquid feeding side connecting pipe 6b on the side of the heat absorption 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 vibrating heat exchanger, after the heat absorption part 3 and the heat radiation part 4 are sucked into a high vacuum state, a refrigerant such as a Freon refrigerant (C2F3 C13 etc.) is sealed. is circulated as shown by the arrow in Fig. 2, and the heat is absorbed from the insulating oil 1a in the tank 1 in the heat absorbing section 3, and is radiated into the atmosphere from the heat dissipating section 4. There is.

(Problems to be Solved by the Invention) In the above-described configuration, when the heat dissipating section 4 is separated from the heat absorbing section 3, transported, and then reconnected at the installation site of the transformer,
Both are at room temperature and maintain equilibrium in their gas and liquid phases with a vapor pressure that corresponds to the temperature at that time, and both vapor pressures are negative and positive, which is smaller than atmospheric pressure. ing.

Therefore, when connecting the pipe joints 7 and 8, there is a problem that a small amount of air is sucked into the cooling device and mixed into the refrigerant, reducing 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. 2, and since air may remain even after the refrigerant is discharged, there is a problem in that a cooling characteristic test of the cooling device must be conducted afterwards.

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

[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 inlet 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 device is characterized in that the heat radiation part and the heat absorption part are provided with cutoff valves located near each of the joints.

(Function) The transformer cooling device of the present invention closes each cutoff valve when the heat radiation part and the heat absorption part are connected by the joint. Then, by heating the space between each joint and each cutoff valve, the internal pressure between each joint and each cutoff valve is increased. Therefore, by connecting the joints in this state, air is not sucked into the heat radiating part and the heat absorbing part, and the heat radiating part can be connected to the heat absorbing part.

After connecting the joints, open the shutoff valve.

(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 pipe type cooling device for cooling the insulating oil 11a.
and the heat dissipation section 15 placed on the ground. The heat absorbing section 14 and the heat dissipating section 15 are connected by an air supply side connecting pipe 16 and a liquid supply side connecting pipe 17, which constitute an air supply road and a liquid supply passage, and are configured in a closed loop shape as a whole. and,
Both connecting pipes 16 and 17 are divided into upper and lower parts near the upper outer side of the tank 11, and connect the upper end of the lower chain side connecting pipe 16a as a refrigerant outlet of the heat absorption part 14 and the upper air supply side as a refrigerant inlet 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 part 15 and the two ends of the lower wave harmonic connecting pipe 17b as the refrigerant outlet of the heat absorbing part 14, They are removably connected by removable pipe joints 18 and 19 with automatic sealing mechanisms as joints, respectively. These detachable pipe joints 18 and 19 are a pair of joint elements 18a each having a self-sealing valve mechanism (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 to 23 are cutoff valves, and among these, the cutoff valve 20 is located near the joint 18 and is attached to the lower chain side connecting pipe 16a of the heat absorption part 14, and the cutoff valve 21 is located near the joint 18. The cutoff valve 22 is located near the joint 19 and attached to the lower transmission harmonic coupling pipe 17b of the heat absorption part 14, and the cutoff valve 22
3 is located near the joint 19 and attached to the upper liquid feeding side connecting pipe 17a of the heat radiating section 15.

Next, the operation of the above configuration will be explained. First, after the completion test of the transformer at the manufacturing factory, with the inside of the heat vibrator cooling device 13 under positive pressure, the shutoff valves 20 to 23 are closed, and then the joint f , cord T18a, 18
b, 19a, and 19b are separated, and the heat radiation part 15 is connected to the heat absorption part 1.
Separate from 4.

After transporting the tank 11 to the transformer installation site and burying it in the ground, the coupling elements 18a and 18 of the two detachable pipe joints 18 and 19 connected to the heat absorption part 14 and the heat radiation part 15 are removed.
b, 19a, and 19b facing each other, and 4 prepared by the worker.
heaters 24 for each joint element 18a, 18b, 19
It is attached so as to surround the space between a and 19b and each of the cutoff valves 20 to 23, and the four heaters 24 are energized. Then,
Until then, the space between each joint cord 18a, 18b, 19a, 19b and each cutoff valve 20 to 23 had been at room temperature to varying degrees, and liquid refrigerant had accumulated in the lower part of the pulley. When the temperature rises due to heating by the heater 24, the internal liquid refrigerant evaporates and each joint element 18a,
18b, 19a.

The internal pressure between 19b and each of the shutoff valves 20 to 23 rises. When the internal pressure rises to positive pressure, the coupling elements 18b and 19b of the detachable pipe couplings 18 and 19
are connected to the coupling elements 18a and 19a, and then the shutoff valves 20 to 23 are opened, thereby connecting the heat dissipating section 15 to the heat absorbing section 14. In addition, whether or not the pressure has become positive can be determined by checking the heater 24.
This can be determined by the power consumption of the heater 24 or by measuring the temperature of the part heated by the heater 24.

In this way, when connecting the joint cords 18b and 19b of the detachable pipe joints 18 and 19 to the joint cords 18a and 19a, each joint cord 18a, 18b, 19a.

Since the internal pressure between 19b and each of the shutoff valves 20 to 23 is positive, external air flows into each coupling element 18a, 1.
8b, 19a, 19b and each cutoff valve 20 to 23, and therefore, even if the cutoff valves 20 to 23 are opened, air is not drawn into the heat absorption part 14 and the heat radiation part 15. There is no.

Moreover, since the heater 24 only needs to heat the vicinity of the joints 18 and 19 of the air supply side connecting pipe 16 and the liquid supply side connecting pipe 17, its power consumption may be extremely small.

Note that when the joints 18 and 19 are connected, a small amount of internal refrigerant is released to the outside, but it is not enough to deteriorate the cooling characteristics.

[Effects of the Invention] As is clear from the explanation in 1- below, the present invention provides a cutoff valve located near the joint in the heat radiating part and the heat absorbing part, so that when the heat radiating part and the heat absorbing part are connected, the joint By heating the space between the valve and the shutoff valve to increase the internal pressure, it is possible to prevent air from being sucked in, which simplifies the connection work of the joint and prevents a drop in cooling performance.

[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,
14 is a heat absorber, 15 is a heat radiator, 18 and 19 are detachable pipe joints (joints), and 20 to 23 are cutoff valves. Agent Patent Attorney Ken Nori Chika Butsuma Ken Maru Figure 1

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. The heat pipe type cooling device is equipped with a heat pipe type cooling device in which 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 respectively connected by joints to circulate the refrigerant sealed inside. A transformer comprising a shutoff valve located near each of the joints.