JPS61239606A - Oil-immersed electromagnetic induction apparatus - Google Patents

Abstract

PURPOSE:To maintain the characteristics of insulating oil in a housing case for a long period of time as well as to improve the reliability of the apparatus contained in the housing case by a method wherein a solid-state chemical absorbent is wrapped in a filter of the mesh of mum order or below, and it is arranged in the housing case. CONSTITUTION:The apparatus main body 3 and insulating oil 2 are placed in a housing case 1, and the heat generated on the main body 3 is emanated outside the housing case 1 by the oil stream 4 generated by the convection of oil. The solid-state chemical absorbent 6 wrapped in a filter 5 having the mesh of mum order or less is arranged in said housing case 1, and the absorbent 6 is converted to activated clay. As a result, the deterioration in characteristics of the insulating oil 2 can be suppressed for a long period of time, and the reliability of the apparatus main body 3 contained in the housing case can also be improved.

Description

[Detailed Description of the Invention] 1 [Industrial Application Field] j This invention relates to oil-filled electromagnetic induction equipment.
O''**nr's+m, t*1 This relates to oil-filled electromagnetic induction equipment.

B [Prior Art] Conventionally, in the field of oil chemical industry, activated clay and alumina-based adsorbents have been mainly used as adsorbents for refining and decolorizing petroleum, oils and fats. In addition to the above-mentioned decolorizing effect, these adsorbents have various properties of insulating oil for oil-filled electromagnetic induction equipment, including total oxidation and moisture content.

It is well known that it has the ability to improve resistivity, tan δ, breakdown voltage, etc., and is used to improve the properties of insulating oil. Among these, activated clay is about an order of magnitude lower in cost than alumina-based adsorbents, and is often used industrially as the cheapest oil purifying agent.

However, on the other hand, the insulation properties of oil-filled electromagnetic induction equipment.

It is strongly influenced by foreign particles in the oil, and as the number of particles increases, the insulation properties deteriorate. Therefore, it is necessary to avoid the presence of solid foreign matter inside the oil-filled electromagnetic induction device body.

In addition, because chemical adsorbents have a limited total amount of adsorption, they must be replaced after their adsorption properties reach saturation, and conventionally they were used only in places where they could be replaced. .

[Zhao point that the invention is trying to solve]

As mentioned above, in conventional oil-filled electromagnetic induction equipment.

The problem is that long-term reliability cannot be obtained unless the design allows for long-term deterioration of the insulating oil, or expensive measures such as replacing the insulating oil or installing an external insulating oil purifying device 5 are used. was there.

The present invention has been made to solve these problems, and an object of the present invention is to obtain an oil-filled electromagnetic induction device that is inexpensive and has long-term reliability.

[Means for solving problems]

The oil-filled electromagnetic induction device according to the present invention uses a solid chemical adsorbent that improves the dielectric properties of insulating oil.

It is wrapped in a filter of μm order or smaller and placed inside the storage case of the main body of the device.

[For production]

In this invention, in order to prevent the adsorption properties of the chemical adsorbent from becoming saturated in a short period of time, the adsorbent is wrapped in a fine-mesh filter to suppress effective contact between the adsorbent and the insulating oil. , the effectiveness of the adsorbent can be connected in the long term.

〔Example〕

The effect of particles in oil on insulation properties is theoretically HIF-
fe Q * K ld M FjA @ h 'C“
It is thought that particles with a size above 71""-Par-2 have a large influence. Figure 2 shows the insulating oil obtained by changing the number of particles in the oil using o and lrμm mesh filters. An example of the relationship between the breakdown voltage of the insulating oil and the number of particles in the oil on the order of μm or more is shown below.From this, it can be seen that the dielectric strength of the insulating oil can be sufficiently managed by controlling the number of particles in the oil on the order of μm or more.This invention Well then.

By wrapping the adsorbent with a mesh filter of micrometer order or less, it prevents the contamination of particles that affect dielectric strength.
Prevents deterioration of insulation properties.

FIG. 1 shows an embodiment of the present invention, in which the storage case (2) of the self-cooled induction equipment main body is filled with insulating oil (2) as an insulating and cooling medium. ) Insulating oil (2) to prevent heat generation from the iron core (3a) and coil (3b)
An oil flow (oil flow) occurs due to convection inside the storage case (/l), and through this, heat is carried to the storage case (/l), and there are many outside of the storage case (/l). A solid chemical adsorbent (A) is placed in a sub-order filter (j).

With the above configuration, contact between the insulating oil (2) and the adsorbent (6) is suppressed without impairing the cooling capacity inside the induction equipment main body (3), and the effectiveness of the adsorbent (6) is maintained for a long time. is maintained.

In addition, by placing the adsorbent (A+) outside the main flow path of the insulating oil (2) in the storage case (/l), it is possible to
), the efficiency of using the cooling space can be improved, and the total amount of oil required can also be reduced.

Activated clay, which is industrially inexpensive, is suitable as the adsorbent (6).

Note that the electromagnetic induction device is not limited to a self-cooling type, but may be an oil-feed cooling type, and similar effects can be obtained.

〔Effect of the invention〕

As is clear from the above description, this invention is based on the fact that a solid chemical adsorbent is wrapped in a filter with a mesh size of micrometer order or less and placed inside a storage case). It has the effect of maintaining the long term and improving the long term reliability of one piece of equipment.

[Brief explanation of the drawing]

FIG. 1 is a schematic front sectional view of an embodiment of the present invention. Figure 1 is a characteristic diagram of the relationship between the breakdown voltage of insulating oil and the number of particles in the oil. (1)...Storage case, (2)...Insulating oil, (3)...
Equipment body, (S)...Filter, (6) Fist chemical adsorbent.

Claims (2)

[Claims] (1) A storage case containing the equipment body and insulating oil,
This oil-filled electromagnetic induction device includes a solid chemical adsorbent placed in this storage case and surrounded by a filter with a mesh size of μm order or less. (2) The oil-immersed electromagnetic induction device according to claim 1, wherein the chemical adsorbent is activated clay.