JP4684721B2 - Conservator - Google Patents

Description

  The present invention relates to an oil-filled device in order to prevent deterioration of the insulating oil due to the breathing action of an oil-filled electrical device (hereinafter referred to as oil-filled device) in which a transformer, a reactor, etc. are housed and filled with insulating oil. Concerned Conservator

As a transformer as one of electric devices, there is an oil-filled transformer in which a transformer body is immersed in insulating oil. FIG. 3 is a diagram illustrating an example of an oil-filled transformer. The oil-filled transformer 160 contains the main body of the transformer 101 in the main body tank 100 and is filled with insulating oil 102. The main body tank 100 is connected to the upper portion of the main body tank 100 through the connecting pipe 107. A conservator 150 that communicates is provided. In the conservator 150, the insulating oil 102 that has flowed from the main body tank 100 is usually stored together with the air 108.

  When the transformer 101 is operated, the transformer 101 generates heat due to no-load loss (iron loss), and the temperature rises. As the temperature rises, the insulating oil 102 is heated and the volume of the insulating oil 102 expands. Further, when the load on the transformer 101 increases or decreases, the load loss (copper loss) changes accordingly, and the amount of generated heat changes, so that the temperature of the insulating oil 102 rises and falls, and as a result, the volume of the insulating oil 102 changes. Along with the change in the volume of the oil 102, the air in the transformer enters and exits the breathing action. This breathing action causes a harmful effect such that new air sucked from the outside comes into contact with the surface of the oil 102 and oxidizes the oil 102, or moisture in the air is absorbed into the oil 102 and the dielectric strength decreases. In order to suppress such harmful effects caused by the respiratory action, the conservator 150 functions to reduce the contact area between the outside air and the oil.

  A hygroscopic respirator 104 is provided on the side of the oil-filled device via a communication pipe 105 extending from the top of the conservator 150. The hygroscopic respirator 104 is a device that dehumidifies the outside air with a desiccant (silica gel) enclosed therein. An oil pot 134 is attached to the lower surface of the hygroscopic respirator 104. As the insulating oil 102 contracts, the outside air is sucked into the hygroscopic respirator 104 from the oil pot 134, where it is dehumidified to become dry air 108 and flows into the conservator 150 through the communication pipe 105. On the other hand, when the insulating oil 102 expands, the dry air 108 is pushed out to the hygroscopic respirator 104 through the communication pipe 105 and released from the oil pot 134 to the outside air. By sucking and releasing the dehumidified dry air 108 in this way, it is possible to prevent condensation on the wall surface inside the conservator, particularly in winter.

  However, when the oil-filled device 160 is operated for a long time and the inflow and outflow of outside air is repeated, the moisture absorption capacity of the desiccant filled in the moisture-absorbing respirator 104 gradually decreases. If left untreated, outside air that has not been dehumidified flows into the conservator as the oil temperature decreases, and there is a risk of condensation inside, resulting in corrosion of the steel material. Therefore, it is necessary to replace it early. The replacement of the hygroscopic agent is usually performed once or twice a year, depending on the capacity of the oil-filled equipment and its operating state. In such replacement work, there is a problem that the amount of the hygroscopic agent to be replaced is very large, requiring a lot of labor and cost.

On the other hand, for the purpose of preventing the deterioration of the insulating oil, various proposals have been made to provide a heat-resistant and oil-resistant rubbery diaphragm between the insulating oil in the conservator and the air. (For example, see Patent Documents 1, 2, and 3).
However, the diaphragms used in these proposals are effective in preventing the deterioration of the insulating oil for a relatively short period of time, but since they are constantly in contact with the insulating oil and repeatedly expanded and contracted while being exposed to high temperatures, In view of the above, there was a problem of deterioration of the diaphragm itself. In addition, since the outside air repeatedly flows in and out at the upper part of the diaphragm, if the outside air is not dehumidified, condensation may occur and the steel material fixing the diaphragm on the peripheral wall may be corroded. For this reason, it has been practiced to preliminarily install a hygroscopic respirator to dehumidify the outside air. However, as described above, there still remains a problem that the exchanging work of the hygroscopic agent requires a great amount of power and cost.

JP-A-6-61067 JP-A-9-82533 JP 2001-126931 A

  Therefore, in view of the above circumstances, the present invention eliminates the need for a hygroscopic agent such as silica gel, can reduce the cost and labor associated with the replacement of the hygroscopic agent, prevent condensation inside, and corrode the steel due to this. The purpose is to provide a conservator that can be prevented.

According to the present invention, the above object is provided in communication with an oil-filled electrical device in which insulating oil is sealed, and inside the container having a cover and a vent above the peripheral wall , from within the oil-filled electrical device. The oil container is separated from the oil container by an oil container that stores the insulating oil that has flowed into the container, and a diaphragm whose outer periphery is fixed to the peripheral wall, and is disposed on the peripheral wall at a position higher than the diaphragm in the peripheral wall. The deformable member made of a sheet-like body having a fixed outer periphery is interposed between the gas accommodating portion that accommodates gas in a state in which circulation with the outside air is interrupted, and the diaphragm and the deformable member, so that the two are not in close contact with each other And the gas accommodating portion transmits the movement of the diaphragm caused by the expansion and contraction of the insulating oil to the deformable member via the gas flow in the gas accommodating portion and deforms it. like Is achieved by conservator, characterized in that have been made.

As described above, the conservator of the present invention has a diaphragm that defines an oil storage section, and a gas storage section that is in contact with the diaphragm and stores gas in a state in which the circulation with the outside air is cut off. The gas accommodating portion is a portion of the remaining part content excluding oil accommodating portion from the conservator in volume. The portion excluding the total volume of this oil containing portion from the internal volume of the conservator container, a structure such as the outer air is flows in and out. For the diaphragm, for example, an elastic material such as a rubber sheet can be used, but it is more preferable to use a material having both heat resistance and oil resistance.

In addition, the gas storage portion stores gas therein, and transmits the movement of the diaphragm to and from the oil storage portion to the deformable member made of a sheet-like body through the flow of the gas, thereby deforming it. Let Here, the “deformable member” refers to various materials having air permeability that blocks the passage of gas and having at least one property of softness, flexibility, elasticity, and the like. In the present specification, hereinafter, the “deformable member” is used as a member having such a property. Among these properties, the deformable member preferably has elasticity. The deformable material may have oil resistance, heat resistance, etc. in addition to the above properties.

Examples of such a deformable member include non-elastic materials such as a paper sheet cloth sheet having an appropriate coating treatment on the surface, and elastic materials such as a rubber sheet. In addition, the polymer resin sheet includes an elastic sheet and an inelastic sheet, and any of them can be used. Such a sheet-like body can form a gas accommodating part by fixing the outer peripheral part of the said sheet-like body to the surrounding wall of predetermined height from the oil surface of the insulating oil in the oil accommodating part in a conservator. When an inelastic material is used as the sheet-like body, it is preferable to fix the sheet-like body with a margin so that the central portion of the sheet-like body is lifted upward according to the flow of gas. Moreover, you may give the process of forming the bellows structure which functions so that a sheet-like body may lift upwards with the flow of gas along the outer peripheral wall of a sheet-like body. When the elastic material is used as a sheet-like body, it is possible to reduce the necessity of providing a margin as described above or providing a bellows structure.

  As the gas accommodated in the gas accommodating portion provided with this deformable member, normal air that has not been dehumidified, dry air, nitrogen gas, etc. can be used, but in the unlikely event that the air-impermeable material is damaged, Thus, it is preferable to use dry air or nitrogen gas. In addition, an inert gas (such as argon or xenon) can be used when it is easily available. Among these, for dry air, for example, air that has passed through a hygroscopic agent can be sealed using a pump or the like, and for nitrogen gas and inert gas, the pressure in the cylinder is used from the cylinder filled with each gas. And can be enclosed in the gas container.

Since the oil-filled equipment is often installed outdoors , the cover must take into account the deterioration of the deformable member due to ultraviolet rays, etc. Even if the oil-filled equipment is installed indoors, , such as by the influence ultraviolet since not negligible, is intended to mask the deformable member, such as a pre-carboxymethyl over preparative like body. This cover is particularly preferably weather resistant. As such a cover, a variety of plate-like materials can be used, for example, various light-impermeable plate materials such as a steel plate, an iron plate, a cement plate, and a wooden plate, as well as colorless or plastic plates, glass plates, and the like. Colored transparent plates can also be used. In addition to such a plate material, a sheet material having weather resistance and a certain level of mechanical strength, such as a plastic sheet, can also be used. When a transparent plate is used, it is preferable to use a material that can block ultraviolet rays. In this case, the various plate materials may be used alone or in combination of two or more. Then, these plate materials may be appropriately processed into a box shape or the like that can cover the deformable member. At this time, the size of the cover is preferably designed so as to surround the deformable member at the maximum deformation in consideration of the maximum deformation amount of the deformable member. Cover housing a deformable member, Ru can be fixed to a outer surface of the conservator and the oil-filled electric apparatus unit.

According to the present invention, it is possible to prevent the outside air from being newly inhaled, so that it is not necessary to install a respirator filled with a hygroscopic agent such as silica gel, and the cost and labor associated with the replacement of the hygroscopic agent can be reduced. In addition, it is possible to prevent internal condensation and corrosion of the steel material due to this.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the accompanying drawings.

[Embodiment 1]
Figure 1 is a Ru FIG showing one example of an oil-filled device equipped with conservator in the first embodiment of the present invention. In view of this, conservator 150 is an upper portion thereof opened to the atmosphere, a container substantially rectangular opening is provided upward. A sheet-like body (deformable member) 123 made of a rubber sheet is disposed at a predetermined height on the peripheral wall standing so as to surround the opening. The lower of the sheet product 123, dry air 120 is formed a gas accommodating section 152 which is sealed, is isolated from the ambient air of the upper by the sheet product 123. The pressure of the dry air 120 inside the gas storage unit 152 can be set as appropriate, but is usually about 0.08 to 0.12 MPa in absolute pressure, preferably about 0.09 to 0.11 MPa, more preferably about large. Set to atmospheric pressure. Setting the pressure to an excessively high positive pressure or negative pressure will keep the deformable member in an expanded or contracted state at all times, and will correspond to the gas flow accompanying the expansion and contraction of oil during transformer operation. It is not preferable because the shape cannot be changed. For the purpose of adjusting the gas pressure in the gas storage unit, the above-mentioned pump or a cylinder filled with various gases is permanently installed around the oil-filled electrical device, and when necessary, the gas is pressed into the gas storage unit. A gas release valve may be provided on the wall of the conservator surrounding the gas storage unit. In this way, the sheet-like body 123 blocks the dry air 120 and the outside air, so that the contact between the insulating oil 102 and the outside air can be cut off. Is possible. In FIG. 1 , illustration of the inlet and outlet of the insulating oil 102 is omitted. Further, these figures odors Te, for 3 identical or common portions, using the same reference numerals, and redundant description will be omitted.

The sheet-like body 123 can be fixed by sandwiching its outer peripheral portion with a flange surface that divides the container peripheral wall of the conservator 150 vertically as shown in the example of attaching the diaphragm in FIG. According to such a fixing method, replacement when the sheet-like body 123 deteriorates or periodic replacement becomes easy.

The conservator 150 in the first embodiment is also provided with the diaphragm 110 shown in the above embodiment at the interface between the insulating oil 102 and the dry air 120 as shown in FIG. 1 to isolate the oil storage portion from the gas storage portion. ing. For this diaphragm 110, for example, an elastic material such as a rubber sheet can be used, but it is more preferable to use a material having both heat resistance and oil resistance. As in the case of the sheet-like body 123 of FIG. 2 , the diaphragm 110 can also be fixed by sandwiching its outer peripheral portion with another flange surface that divides the conservator 150 vertically.

A spacer 127 is disposed in the sealed space between the diaphragm 110 and the sheet-like body 123 as shown in FIG . The spacer 127 may be fixed using an appropriate method so as to be in contact with the diaphragm 110 or the sheet-like body 123 in the space, or may simply be placed on the diaphragm 110. By disposing the spacer 127 in this way, the adhesion between the diaphragm 110 and the sheet-like body 123 can be prevented, and the distance between them can be secured. The spacer 127 can be a piece of a plate that is appropriately selected from the plate materials used for the cover and cut to an appropriate weight. The sheet material that can be used for the cover is processed into a box shape having an opening upward. Can also be used. By forming the box like this, the box can be filled with a hygroscopic material such as silica gel, and as a result, complete dehumidification of the gas sealed in the gas storage unit 152 can be ensured.

  A cover 125 is disposed above the sheet-like body 123 to prevent the diaphragm 123 from being deteriorated by ultraviolet rays and preventing dust and dirt from entering from the outside. The cover 125 is provided with a vent hole through which outside air can flow in and out so as to smoothly expand and contract the sheet-like body 123.

The conservator 150 is provided with a pressure detector for the purpose of monitoring the pressure of the dry air 120 and can be utilized for detecting breakage of the sheet-like body 123. An oil level gauge may be provided on the side wall of the conservator 150 to monitor the oil level of the insulating oil 102 so that an inspector can visually check it.

  In this conservator 150, the volume expansion of the insulating oil 102 caused by the operation of the transformer 101 causes the diaphragm 110 to expand upward. Conversely, when the oil temperature decreases, the oil 102 contracts, and as a result, the diaphragm 110 is deflated. Thus, the diaphragm 110 moves up and down by the load fluctuation of the transformer 101. Along with the vertical movement of the diaphragm 110, the dry air 120 sealed with this and the sheet-like body 123 flows up and down, and as a result, the sheet-like body 123 swells upward and deflates downward.

  As described above, the conservator 150 of the present invention causes the dry air 120 in the gas storage portion 152 to flow in a sealed state in response to the rising and lowering of the oil level accompanying the expansion and contraction of the insulating oil 102 therein, thereby The deformable member made of the sheet-like body 123 is deformed. Accordingly, since the expansion and contraction of the insulating oil 102 can be dealt with only inside the container of the conservator 150, the installation of the hygroscopic respirator 104 can be made unnecessary. As a result, the problem of condensation in the conservator can also be solved. Even if the hygroscopic respirator 104 is provided as necessary, the hygroscopic agent replacement cycle can be set longer, and labor and cost can be reduced. In addition, by sealing the gas accommodating portion, it is possible to easily monitor breakage of the deformable member, and it is possible to extend its useful life.

  In addition, any oil-filled equipment or conservator that includes the elements of the present invention and can be appropriately modified by those skilled in the art is included in the scope of the present invention.

  Moreover, although the structure of an oil-filled apparatus etc. is abbreviate | omitted for the simplification of description, it cannot be overemphasized that those structures are included.

  As described above, the conservator of the present invention absorbs the breathing action of the oil-filled equipment by the flow of the air sealed inside, and eliminates the need for installing a hygroscopic respirator or replacing the hygroscopic agent. Can greatly contribute to the maintenance-free operation of oil-filled equipment. It is also easy to apply the present invention to a conservator for existing oil-filled equipment.

It is a figure which shows an example of the oil-filled apparatus carrying the conservator of this invention. It is a figure which shows the example of attachment of the diaphragm 123. FIG. It is a figure which shows an example of the oil-filled transformer carrying the conventional conservator.

100 Tank 101 Transformer 102 Insulating oil
1 07 connection pipe 108 air 110 diaphragm 120 dry air
1 23 Sheet
1 2 5 Cover 127 Spacer 130 Pressure regulator 150 Conservator 151 Oil container 152 Gas container 160 Oil-filled transformer

Claims (5)

The insulating oil, which is installed in communication with an oil-filled electrical device in which insulating oil is sealed and has a cover and a vent above the peripheral wall , flows into the container from the oil-filled electrical device. It is made of a sheet-like body that is isolated from the oil storage portion by an oil storage portion to be stored and a diaphragm whose outer periphery is fixed to the peripheral wall, and whose outer periphery is fixed to the peripheral wall at a position higher than the diaphragm in the peripheral wall. has a gas storage portion for storing gas in a state in which broke off communication with the outside air by the deformable member, interposed between said deformable member and said diaphragm, and a spacer so as not to contact the two, the gas The accommodating portion is configured to transmit the movement of the diaphragm caused by the expansion and contraction of the insulating oil to the deformable member via the gas flow in the gas accommodating portion, and to deform the deformable member. When That conservator. The conservator according to claim 1 , wherein the deformable member is made of an elastic material. The conservator according to claim 1 or 2, wherein the spacer is processed into a box shape, and a hygroscopic material is filled therein. The conservator of any one of Claims 1-3 provided with the pressure detector which monitors the gas pressure in the said gas accommodating part . An oil-filled electrical device comprising the conservator according to any one of claims 1 to 4.

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