JPH01117006A - Stationary induction apparatus - Google Patents

Abstract

PURPOSE:To realized effective cooling, by constituting a cycle wherein refrigerant is supplied to a transformer cooling tank from the lower part, and the overflowing refrigerant is dropped along the inner wall of the tank, which is supplied to a refrigerant tank. CONSTITUTION:Heat generated in a transformer winding 2 and an iron core 3 is absorbed by refrigerant 4, and the temperature of the refrigerant in a tank rises. The refrigerant 4 whose temperature is decreased by a cooling equipment 10 is again supplied from the bottom of a refrigerant tank 5 via a feeding pipe 7, and the inside of a transformer is effectively cooled. When the refrigerant 4 having absorbed heat reaches the upper surface of the tank 5, it is poured on the side surface of the tank 1 and a magnetic shielding plate 12, after travelling a refrigerant guide 11, so that the whole part of the tank 7 is uniformly cooled. Since a small cooling holes are arranged in the midway of the guide 11, the refrigerant 4 drops like shower in the tank 1, and absorbes heat from insulating gas 8 exitisting in the midway. Then the refrigerant 4 returns to the lower part of the tank 5 through the feeding pipe 7, a pump 6, and the cooling equipment 10.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to stationary induction electric appliances such as transformers and accelerators.
In particular, the present invention relates to a stationary induction appliance in which a cooling medium for cooling the main body of the stationary induction appliance and a non-condensable gas with high electrical insulation are sealed in the same tank.

[Conventional technology]

Recently, as the demand for electricity has expanded, especially in urban areas, the number of large-capacity, high-voltage transformers being installed in densely populated areas has increased. There was a desire to develop static induction electrical equipment such as new transformers that could be adapted to urban environments such as urbanization.

For example, in a transformer, a device that can meet these demands has a tank containing highly electrically insulating non-condensable gas (
A gas insulated transformer has been proposed in which the heating element such as the transformer winding is impregnated with a cooling medium (such as fluorocarbon), and the generated heat is removed through this cooling medium. has been done.

This type of stationary induction electric appliance has two methods for bringing the cooling medium into contact with the heating element: (1) a spray method in which the cooling medium is sprinkled on the heating element; (2) a semi-pool method in which the windings that generate a large amount of heat are immersed in the cooling medium; There are three methods: (3) a pool method in which the entire contents of the transformer are immersed in a cooling medium; however, the pool method (3) above is the best in terms of efficiently cooling a large capacity transformer. However, since this method requires a larger amount of expensive cooling medium than other methods, published patent publications such as JP-A No. 58-158906 suggest that a filling material be placed between the transformer contents and the tank as a way to save this amount. Measures to be taken are shown.

',C,:%'Problem that Ming tries to solve〕''7However, with such conventional technology, leakage of magnetic flux from windings etc., which is a particular concern in large-capacity transformers, can occur at various parts of the tank wall. No consideration has been given to preventing temperature rises or cooling the insulating gas that has risen in temperature.

Therefore, the purpose of the present invention is to reduce the amount of expensive cooling medium as much as possible, and also to effectively cool the inner wall of the tank that is not immersed in the cooling medium and the electrically insulating gas that is filled with the cooling medium. The object of the present invention is to provide a stationary induction electric appliance with excellent cooling characteristics.

The object of the present invention described above is to provide a condensable cooling medium tank in which the contents of a transformer are immersed in a tank filled with a non-condensable insulating gas, and to supply this cooling medium from the lower part of the tank. The cooling medium overflowing from the top of the tank near the cover is made to fall along the tank inner wall, and the cooling medium that falls and is collected at the bottom of the tank is passed through the cooler and returned to the cooling medium tank from the bottom of the tank. This is achieved by configuring the cooling medium cycle to supply

Cooling of the electrically insulating high-pressure gas is achieved by causing a portion of the cooling medium overflowing from the upper end of the cooling medium tank and flowing to the inner wall of the tank to fall into the tank in the form of a shower.

That is, the gist of the present invention is to provide a tank filled with an electrically insulating high-pressure gas, a cooling medium tank installed in the tank that stores a cooling medium, and a cooling medium installed in the cooling medium tank that is not eroded by the cooling medium. A stationary induction electric appliance consisting of an iron core wrapped with a winding wire, a cooler that cools the cooling medium, a mechanism that supplies the cooling medium cooled by the cooler to the lower part of the cooling medium tank, and a mechanism that supplies the cooling medium to the cooling medium tank. A cooling medium guide mechanism that guides the overflowing cooling medium from the top end of the cooling medium tank to the vicinity of the tank internal wall so that it falls along the tank internal wall; This is a stationary inductor that is equipped with a mechanism for guiding the cooling medium accumulated in the cooling medium to the cooler, and further uses a guide plate having a plurality of holes as the cooling medium guiding mechanism.

[Effect]

The cooling medium tank is supplied with a cooling medium that has been sufficiently cooled by a cooler, and the entire heating element is completely covered with this cooling medium, so the heat generated by the heating element is efficiently removed.
Furthermore, as the cooling medium overflowing from the cooling medium tank falls along the tank internal wall or a part of it falls into the tank in the form of a shower, the leakage magnetic flux generates heat on the tank internal wall and the electrically insulating high pressure gas. Heat is removed using the minimum necessary amount of cooling medium.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 The present invention will be explained using an example of a transformer. FIG. 1 is a schematic sectional view of the transformer, and FIG. 2 is a schematic top view.

The winding 2 in the transformer tank 1 is wound around the iron core 3,
A cooling medium 4 for cooling the contents of these transformers is filled in a cooling medium tank 5 while completely immersing the contents of the transformers.

Therefore, the heat generated in the windings 2 and iron core 3 of the transformer is absorbed by the cooling medium 4 and the temperature of the cooling medium in the tank rises. Since the tank 5 is refilled from the bottom, the low-temperature cooling medium is always in contact with the inside of the transformer, and heat can be efficiently absorbed.

Furthermore, after the coolant that has absorbed the heat reaches the top surface of the coolant tank 5, it overflows in the vicinity of the cover of the transformer tank, travels through the coolant guide 11, and most of the coolant is attached to the side plate of the tank 1 or attached thereto. Since the liquid is poured onto the magnetic shielding plate 12 and falls, almost the entire tank area from the tank cover to the bottom plate can be cooled evenly. Also, as shown in Fig. 2, many small cooling holes 〇 are provided in the middle of the cooling medium guide 11 installed to cover the transformer tank, so that the cooling medium 4 overflowing from the cooling medium tank 5 flows into the tank 1. Before being poured onto the side plates and magnetic shielding plate 12, a portion of the gas falls into the tank like a shower, and also acts to remove heat from the insulating gas 8 along the way.

The cooling medium that fell from the top of the tank collects at the bottom of the tank, and then flows into the pipe 7. This constitutes a cycle in which the fluid passes through the pump, is guided to the cooler 7, and returns to the lower part of the cooling medium tank 5.

Embodiment 2 FIG. 3 is another embodiment of the present invention, showing a sectional view of the main parts of a transformer. In this example, the side plate of the transformer tank 1 is not straight, and the high voltage lead wire 14 is connected from the outer winding 2b to the pocket portion 1.
This is the case where it is led to the outside through 3.

The magnetic shield plate 12 is used not only in the straight part but also in the pocket part 1.
It has a complicated configuration that is also attached to part of 3.
The cooling medium 4 overflowing from around the tank cover can easily travel through the magnetic shield and fall, so even if the tank structure becomes complicated due to various restrictions, the cooling method used in the actual product can be used to effectively cool the tank. It is possible to do so.

Embodiment 3 FIGS. 4 and 5 are other embodiments of the present invention, showing cross-sectional views of the vicinity of the upper part of the transformer. All of these are intended to reduce the amount of expensive condensable cooling medium 4 to a minimum, and the space between the transformer contents and the cover of tank 1 is filled with an insulating material 15 such as resin. It has a structure. In addition, in both structures, the cooling medium 4 is guided very close to the tank cover and overflows from the top surface of the cooling medium tank 5 so that the cooling medium 4 can travel through the tank 1 over a wide range and fall. Note that FIG. 4 shows an example in which the overflow ports of the cooling medium 4 are located on both sides of the side plate of the tank 1, and FIG. 5 shows an example in which there is one overflow port in the center, and the effects of both embodiments are as follows. This embodiment is essentially the same as the other embodiments described above.

〔Effect of the invention〕

In the electrostatic induction device according to the present invention, the entire contents of the heating element, such as the transformer, are immersed in the cooling medium tank, so that an excellent cooling effect can be achieved with a minimum amount of cooling medium. Moreover, unlike other cooling methods, the iron core is not structured to come into direct contact with the insulating gas, so it is possible to avoid problems such as corrosion caused by reactions between the iron core of a transformer, etc., and the insulating gas.

Furthermore, the cooling medium that overflows from the top of this tank flows out close to the tank cover, and most of it falls along the tank wall and accumulates at the bottom of the tank.
It is possible to easily cool not only the contents of the transformer but also the entire tank, and it is possible to provide an inexpensive stationary induction electric appliance with excellent cooling characteristics.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, and are a schematic sectional view and a schematic top view of a transformer, and FIG. 3 is a sectional view of essential parts of a transformer showing another embodiment of the present invention. , and Figures 4 and 5.
The figures each show a sectional view of a main part near the upper part of a transformer showing another embodiment of the present invention. 1...Tank, 2, 2a, 2b...Winding, 3...
Iron core, 4...Cooling medium, 5...Cooling medium tank, 6...
・Pump, 7... Piping, 8... Insulating gas, 9...
Cooling hole, 10... Cooler, 11... Cooling guide, 1
2... Magnetic shield plate, 13... Pocket part, 14
...Lead wire, 15...Insulator.

Claims (3)

[Claims] 1. A tank filled with electrically insulating high pressure gas, a cooling medium tank installed in the tank and containing a cooling medium, and an iron core installed in the cooling medium tank and wrapped with a winding corroded by the cooling medium. A stationary induction electric appliance comprising: a cooler for cooling the cooling medium; a mechanism for supplying the cooling medium cooled by the cooler to a lower part of the cooling medium tank;
Cooling by supplying the cooling medium to the cooling medium tank and guiding the cooling medium overflowing from the upper end of the cooling medium tank to the vicinity of the tank inner wall so that the cooling medium falls along the inner wall of the tank. A stationary induction electric appliance characterized by being provided with a medium guide mechanism and a mechanism for guiding the cooling medium falling along the inner wall of the tank and collecting at the bottom to the cooler. 2. The stationary induction electric appliance according to claim 1, wherein the coolant guide mechanism is a coolant guide plate. 3. 3. The stationary induction electric appliance according to claim 2, wherein the cooling medium guide plate is provided with a plurality of holes.