JPH02288313A - Gas insulation transformer - Google Patents

Abstract

PURPOSE:To enable well-flow-balanced, effective cooling by dividing a radiator into one for cooling an iron-core and one for cooling a winding, and securing each minimum gas flow necessary for the cooling of the iron-core and winding individually. CONSTITUTION:An iron-core 2, a winding 3 wound on to the main leg of the iron-core 2, and an insulating gas 4 are kept in a tank 1, and a radiator 5 for cooling the insulating gas 4 and radiator piping 6 are provided outside the tank 1. And, partition plates 7, 8 are fitted between the winding 3 and the tank wall and between the iron-core 2 and the tank wall respectively, to gas-divide the inside of the tank 1. Besides, the radiator 5 is linked to the inside of the tank 1 being gas-divided. Accordingly, each minimum gas flow necessary for the iron-core 2 and winding 3 is secured without making them larger. This makes it possible to perform well-flow-balanced, effective, and uniform cooling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gas insulated transformer that insulates and cools a device body using an insulating gas.

(Prior Art) Conventionally, a gas insulated transformer is configured as shown in FIG. That is, a device body consisting of an iron core 2 made of laminated silicon steel plates and a winding @3 wound around the main leg of this iron core 2 is housed in a tank 1 together with an insulating gas 4 such as SF6. A plurality of radiators 5 for cooling the insulating gas are installed outside the tank, and the tank 1 and the radiators 5 are communicated through upper and lower radiator pipes 6a and 6b. Pass the lower radiator pipe 6a through the insulating gas 4 cooled by the radiator 5 as shown by the arrow)
After flowing into the lower part of the tank 1, it is divided into the gas paths provided inside the iron core 2 and the winding 3, rises while cooling the iron core 2 and the winding 3, and flows from the upper part of the tank 1 to the upper radiator piping 6a. The air is then returned to the radiator 4. As a result, the main body of the device, which consists of two turns of the iron core a3, is cooled and insulated by the steel 4.

(Problem to be Solved by the Invention) However, in the gas insulated transformer having the above structure, the nine gas paths provided inside the core 2 are generally formed with a small width to increase the space factor of the winding. On the other hand, the gas passage provided inside the winding 3 is formed wide for insulation purposes. Furthermore, since the winding 3 is wound around the main leg turn of the iron core 2, the horizontal length of the gas passage within the winding is longer than that of one gas passage. The number of roads is generally higher in windings. Therefore, the cross-sectional area of the gas passage, expressed as (horizontal length) x (width) x (number of pipes), is usually 5 to 10 times larger for the winding 3 than for the iron core 2, and for the tank than for the radiator 5. Most of the insulating gas 4 that has flowed into the lower part of the coil ends up flowing through the gas path inside the winding.

Further, the frictional resistance Δh in the gas path is expressed by the following equation.

Here, d is the diameter of the fluid in the gas path, and is proportional to the width of the gas path. Further, t is the height of the gas path, and ν is the flow velocity. The height L of the gas passage within the core is larger than that of the gas passage within the winding, and the width of the gas passage is smaller as described above. Since the tabs and d are small, the frictional resistance Δ in the gas path when the flow velocity τ is the same.
h will be larger for the gas path inside the iron core. Therefore,
It can be seen that the insulating gas 4 is less likely to flow through the gas path within the iron core than through the gas path within the winding. Due to the above relationship between the gas passage cross-sectional area and frictional resistance, it becomes difficult for the insulating gas to flow into the core 2, and the temperature rise in the core 2 becomes larger than that in the winding 3, which causes the core insulation to deteriorate. This has the disadvantage of shortening the life of the transformer.

Possible solutions to this problem include enlarging the iron core 2 to lower the magnetic flux density, or increasing the cross-sectional area of the gas passage in the iron core, but in either case, the transformer becomes larger. There are drawbacks. In addition, it is possible to round the insulating gas to evenly divide the balance between the gas path in the core and the gas path in the winding, and to reduce the cross-sectional area of the gas path in the winding. It has drawbacks such as being large and causing problems with insulation.

The present invention eliminates the above-mentioned drawbacks, secures the minimum gas flow rate necessary for cooling each of the core and the windings without increasing the size, and provides gas that has a well-balanced flow rate and can perform effective and uniform cooling. The purpose is to obtain an isolation transformer.

[Configuration of the Invention (Means for Determining 111 Issues)] In order to achieve the above object, the present invention stores an iron core and a winding together with an insulating gas inside a tank, and a plurality of radiators and radiator piping outside the tank. In the gas insulated transformer, partition plates are installed between the winding and the inner wall of the tank and between the iron core and the inner wall of the tank to separate the gas inside the tank, and the plurality of radiators are separated into the gas partitions. The main feature is that it communicates with the inside of the tank.

(Function) As a result, the radiator is divided into core cooling and winding cooling, each independently securing the minimum gas flow rate necessary for cooling the core and windings, and performing effective cooling with well-balanced flow rates. be able to.

(Example) An embodiment of the present invention will be described below with reference to FIG.

In the figure, the same parts as in FIG. 3 are indicated by the same reference numerals. The gas insulated transformer of the present invention stores an iron core 2 and a winding 3 together with an insulating gas in a tank 1, and has a plurality of radiators 5m and 5b and upper and lower radiator piping outside a tank J for cooling the insulating gas. 6a.

t; b, l 6 b2. A first horizontal partition plate 7 is provided between the outermost side of the winding 3 and the inner wall of the tank 1, and a second horizontal partition plate is provided between the lower part of the iron core 2 and the inner wall of the tank 1. 8 are installed respectively to separate the gas inside the tank.

Here, a plurality of radiators for cooling insulating gas are divided into two, and a lower radiator pipe 6b1 communicating with one radiator 5a is connected to the tank wall between the first partition plate 7 and the second partition plate 80. , the lower radiator piping 6b2 communicating with the other radiator jbK is connected to the tank wall below the second partition plate 8. And both radiators 5a
is connected to the upper part of the υ tank 1 by a common upper radiator pipe 6.

In the gas insulated transformer configured in this way, when the insulation gas 4 circulates in the tank 1, the insulation gas cooled by the radiator 5a flows through the lower radiator arrangement '1f6b.
, flows into the tank J, and rises while cooling the gas passage provided in the winding 3. Also, radiator 5b
The cooled insulating gas flows through the lower radiator pipe 6b.
2 flows into the pump tank 1 and rises while cooling the gas passage provided in the iron core 2. In other words, the radiator is divided into core cooling and winding cooling according to the ratio of heat loss, and the flow rate flowing to the iron core 2 and winding 3 is secured independently, allowing effective cooling with a well-balanced flow rate. It can be carried out. This makes it possible to make the iron core smaller and increase the magnetic flux density 9, thereby making it possible to improve the cooling effect and reduce the size and weight.

By the way, as shown in FIG. 2, a partition plate 8a provided between the iron core 2 and the inner wall of the tank 1 is installed above the iron core, and the upper radiator piping 6a of one of the radiators 5a divided into two is connected to the partition plate 8a. Even if the upper radiator piping 6a2 of the other radiator 5b is connected to the tank wall above the partition plate 8a, the insulating gas 4 still flows to the P iron core 2 and the winding 3. The flow rate of each can be independently secured, and the effect is the same. Also, as a feature of this case, upper radiator piping 6a, +6a
By measuring the temperature of the iron core 2 and the winding 3, the temperature rise of the iron core 2 and the winding 3 can be indirectly monitored.

Furthermore, it is also conceivable to use two upper and lower radiator pipes to completely separate the circulation system for the insulating gas flowing through the iron core and windings.

[Effects of the Invention] As described above, according to the present invention, an iron core, a winding wound around the main legs of this iron core, and an insulating gas are stored in a tank,
In a gas insulated transformer that includes a plurality of radiators outside a tank for cooling the insulating gas, and radiator piping that communicates the tank and the radiators, there is a gap between the winding and the inner wall of the tank and between the iron core and the tank. A partition plate is installed between each tank and the inner wall to separate the gas inside the tank, and the plurality of radiators are communicated with the inside of the tank where the gas is separated. It is possible to obtain a gas insulated transformer that secures the minimum necessary gas flow rate for each line and performs effective and uniform cooling with a well-balanced flow rate.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view showing another embodiment of the invention, and FIG. 3 is a sectional view showing a conventional gas insulated transformer. 1...tank, 2...iron core, 3...winding, 4...
・Insulating gas, 5*, 5b...Radiator, 6&, 6b
, 6b2° radiator piping, 7,8.8m...partition plate. Figure 1 Applicant's agent Patent attorney Takehiko Suzue b Busy Figure 2

Claims (1)

[Claims] An iron core, a winding wound around the main leg of the iron core, and an insulating gas are housed in a tank, and a plurality of radiators for cooling the insulating gas are provided outside the tank, and the tank and the radiator are communicated with each other. In a gas insulated transformer equipped with radiator piping, partition plates are installed between the winding and the inner wall of the tank and between the iron core and the inner wall of the tank to separate the gas inside the tank, and the plurality of radiators A gas insulated transformer, characterized in that the gas insulated transformer is connected to the inside of the gas-separated tank.