JP3241817U - Oil-filled electrical equipment - Google Patents

Abstract

An object of the present invention is to provide an oil-filled electrical device that uses vegetable oil as an insulating oil and can suppress an increase in product price. SOLUTION: A tank of an oil-filled electrical device and each case of a switching switch and a tap selector constituting a tap changer on load are filled with vegetable oil as insulating oil. Part or all of the tank and the cases are filled with vegetable oils having different viscosities, thereby suppressing increases in product prices. [Selection diagram] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled electrical device having an on-load tap changer, and relates to insulating oil to be filled in the case of the on-load tap changer and the tank of the oil-filled electrical device.

Conventionally, in order to adjust the voltage of a transmission line or a distribution line, an oil-filled electrical equipment equipped with an on-load tap changer that switches the taps of a winding while a load is applied to a transformer according to voltage fluctuations. is known (see Patent Document 1 below).

JP 2017-204512

FIG. 1 shows the configuration of the oil-filled electrical equipment of Patent Document 1. 1 is an oil-filled transformer. It is roughly composed of a tank 3 (hereinafter referred to as a transformer tank) that accommodates and fixes this.

Reference numeral 4 denotes an on-load tap changer provided in the oil-filled transformer 1, which is composed of a changeover switch 5 intended to cut off the load current and a tap selector 6 positioned below it.

7 is a conservator attached to the top of the transformer tank 3 and 8 is a conservator attached to the top of the switching switch 5 . Reference numeral 9 denotes insulating oil that fills the conservator 7 from the transformer tank 3 , and 10 is a shield that blocks contact between the air and the insulating oil 9 within the conservator 7 .

Insulating oil 11a fills the conservator 8 from the case 5a of the switching switch 5, and insulating oil 11b fills the case 6a of the tap selector 6. As shown in FIG. Mineral oil is assumed as the insulating oil 9, 11a, 11b, and is used for the purpose of cooling and insulating the transformer main body 2 and the on-load tap changer 4. FIG.

Reference numeral 12 denotes a hygroscopic respirator, which is connected to the other end of a respiratory tube 13 having one end connected to the upper portion of the conservator 7 . Reference numeral 14 denotes a moisture absorbing respirator connected to the other end of a respiratory tube 15 having one end connected to the upper portion of the conservator 8 .

16 is a radiator attached to the outer surface of the transformer tank 3, and 17 is a bushing for safely flowing electricity from the transformer main body 2 to a transmission line or the like.

The oil-immersed transformer 1 configured as described above switches the taps of the transformer windings without disconnecting the load of the transformer, always adjusts the transformation ratio, and operates to keep the output voltage constant.

In recent years, the use of vegetable oil instead of mineral oil used as insulating oil has been studied for various oil-filled electrical devices including the oil-filled transformer 1 described above. Insulating oil generates carbon dioxide when it is disposed of, but when vegetable oil is used as the insulating oil, the carbon dioxide generated is equivalent to the carbon dioxide absorbed by the plant from which the vegetable oil is extracted, resulting in a carbon-neutral effect. is obtained.

In addition, even in the unlikely event of leakage, vegetable oil is more easily decomposed by microorganisms living in the soil than mineral oil, so it has the advantage of preventing environmental pollution.

Furthermore, vegetable oil has a higher flash point than mineral oil, which can improve safety. Another advantage is that it can be expected to extend the life of transformers compared to mineral oil due to the effect of suppressing deterioration of insulating paper.

Thus, it is desirable to use vegetable oil as insulating oil for oil-filled electrical equipment. It is necessary to adopt vegetable oil with a high

On the other hand, since vegetable oil with low viscosity is generally expensive, the use of such vegetable oil raises the price of oil-filled electrical equipment.

Therefore, the present invention provides an oil-filled electrical device that uses vegetable oil as an insulating oil and can minimize the increase in product price.

In the oil-filled electrical equipment having an on-load tap changer for adjusting the voltage, the device of claim 1 is provided in the tank of the oil-filled electrical equipment and the switching switch and the tap selector that constitute the on-load tap changer. It is characterized in that each case is filled with vegetable oil as insulating oil, and part or all of the tank and each case are filled with vegetable oils having different properties.

The device according to claim 2 is characterized in that the difference in properties according to claim 1 includes at least a difference in viscosity.

The device according to claim 3 is characterized in that the vegetable oils having different properties according to either claim 1 or claim 2 are rapeseed oil and palm oil.

According to the invention of claim 1, it is possible to provide an oil-filled electrical apparatus with improved environmental performance, soil contamination prevention, and safety.

According to the invention of claim 2, since expensive low-viscosity vegetable oil can be used only in places where high fluidity is required, the amount of expensive vegetable oil used can be reduced, and the product price can be suppressed. can.

According to the invention of claim 3, high reliability can be obtained by using palm oil, which has high thermal stability and excellent electrical properties, as the low-viscosity vegetable oil. Also, by using rapeseed oil, which is relatively inexpensive, the product price can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the structure of the oil-filled electrical equipment which concerns on this invention.

Embodiments of the present invention will be described below. The oil-filled electrical equipment according to the present invention has almost the same constituent elements as the oil-filled transformer 1 shown in FIG. Schematically speaking, an oil-filled transformer 1 consisting of a transformer main body 2 and a transformer tank 3 containing it is provided with at least an on-load tap changer 4 , and the on-load tap changer 4 is connected to a switching switch 5 . and a tap selector 6 for oil-filled electrical equipment.

In other words, the oil-filled electrical device shown in FIG. 1 is merely an example of the structure of the oil-filled electrical device according to the present invention. The present invention can be established even if the mounting position of the bushing 17 is different from that shown in FIG. The technical scope of

The technical features of the present invention are based on the premise that insulating oil is placed in the transformer tank 3 and in the respective cases 5a and 6a of the switching switch 5 and the tap selector 6 that constitute the on-load tap changer 4. It is filled with vegetable oil.

Filling with vegetable oil improves environmental performance based on the effect of reducing carbon dioxide during disposal of insulating oil, prevents soil contamination due to its excellent biodegradability in the event of oil leakage, and has a high flash point. The purpose is to improve safety based on The same kind of vegetable oil may be filled in the transformer tank 3 and the cases 5a and 6a of the changeover switch 5 and the tap selector 6 only to achieve this purpose.

When the transformer tank 3 and the cases 5a and 6a of the switching switch 5 and the tap selector 6 are filled with the same kind of vegetable oil, the on-load tap changer 4 that performs the tap switching operation, For example, the case 5a of the switching switch 5 constituting this is filled with vegetable oil having a low viscosity. By filling vegetable oil with low viscosity, the switching operation of the switching switch 5 is performed smoothly. Palm oil can be exemplified as a low-viscosity vegetable oil.

Similarly, the case 6a of the tap selector 6 and the transformer tank 3 can be filled with low-viscosity vegetable oil. If the case 6a and the tank 3 are filled with low-viscosity vegetable oil, it is possible to improve environmental performance, prevent soil contamination, and improve safety due to the use of vegetable oil.

On the other hand, low-viscosity vegetable oil is generally expensive. If the oil is filled with oil, the price of the oil-filled electrical equipment will increase.

Therefore, the present invention is intended to suppress the increase in product price by using low-viscosity vegetable oil only in places where it is essential to fill it, and filling other places with non-low-viscosity vegetable oil. be.

Specifically, the case 5a of the switching switch 5 that performs the tap switching operation is filled with low-viscosity vegetable oil, and the transformer tank 3 (including the case 6a of the tap selector 6) is filled with low-viscosity oil. Fill with non-vegetable oil. The amount of insulating oil to be filled in the transformer tank 3 (including the case 6a of the tap selector 6) is considerably larger than the amount of insulating oil to be filled in the case 5a of the switching switch 5. By filling with vegetable oil, it is possible to suppress the rise in product prices.

Rapeseed oil can be exemplified as a non-low-viscosity vegetable oil. Palm oil, which is exemplified above as a low-viscosity vegetable oil, has high thermal stability and excellent electrical properties, so high reliability can be obtained. In addition to rapeseed oil, soybean oil can be exemplified as the non-low-viscosity vegetable oil. The vegetable oil that does not have low viscosity satisfies the electrical properties required for the product, and it is in line with the gist of the present invention to adopt a low-priced vegetable oil.

As described above, according to the present invention, it is possible to construct an oil-filled electrical device with excellent environmental performance and safety at a low cost, and it is possible to satisfy both the demands of the times such as environmental protection and the demands of consumers such as price reduction. can be made

It can be used for various oil-filled electrical devices having a configuration in which compartments filled with insulating oil are separated.

1 oil-filled transformer 2 transformer body 3 transformer tank 4 on-load tap changer 5 changeover switch 5a changeover switch case 6 tap selector 6a tap selector case 7, 8 conservator 9, 11a, 11b insulation oil 10 shield 12,14 hygroscopic respirator 13,15 breathing tube 16 radiator 17 bushing

Claims (3)

In oil-filled electrical equipment having an on-load tap changer that regulates voltage, insulating oil is placed in the tank of the oil-filled electrical equipment and in each case of the switching switch and tap selector that constitute the on-load tap changer. An oil-filled electrical device, characterized in that it is filled with vegetable oil, and part or all of the tank and the respective cases are filled with vegetable oils having different properties. 2. An oil-filled electrical apparatus according to claim 1, wherein said difference in properties includes at least a difference in viscosity. 3. The oil-filled electrical apparatus according to claim 1, wherein the vegetable oils having different properties are rapeseed oil and palm oil.

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