JP2006295017A - Conservator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conservator which makes a moisture absorbent such as silica gel unnecessary to reduce cost and labor arising from the replacement of such a moisture absorbent, and prevents internal dew condensation to prevent the corrosion of steel caused by the dew condensation. <P>SOLUTION: The conservator comprises an oil storage which is arranged in communication with an oil-containing electric device containing insulating oil sealed therein, and stores the insulating oil flowing in/from the oil-containing electric device, and a gas storage which stores gas to isolate the gas hermetically from the fresh air. The gas storage is capable of changing its shape in response to the flow of the gas caused by the inflation/shrinkage of the insulating oil. The gas storage has a bag-like body or a sheet-like body that changes its shape to store the flowing gas. <P>COPYRIGHT: (C)2007,JPO&INPIT

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. 6 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 container 100 and is filled with the insulating oil 102. The main body container 100 is connected to the upper part of the main body container 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 container 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 beside the oil-filled device via a communication pipe 105 extending from the upper part of the conservator 150. The hygroscopic respirator 104 is a device that dehumidifies outside air with a desiccant (silica gel) enclosed therein. An oil pot 134 is attached to the lower surface of the hygroscopic respirator 104. When 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 as described above, dew condensation on the wall surface inside the conservator is prevented, 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 this 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, there is provided an oil storage portion that is installed in communication with an oil-filled electrical device in which insulating oil is sealed, and that stores the insulating oil that has flowed from the oil-filled electrical device; A gas containing portion that is in contact with the oil containing portion and contains gas in a state in which the circulation of air is cut off, and the gas containing portion is adapted to the flow of the gas caused by expansion and contraction of the insulating oil. This is achieved by a conservator characterized by being configured to change its shape.

  As described above, the conservator of the present invention has an oil storage portion and a gas storage portion that is in contact with the oil storage portion and stores gas in a state in which the circulation from the outside air is cut off. The gas storage part may be the remaining part of the conservator internal volume excluding the oil storage part, or may be a part of the remaining part. When the remaining part of the latter is used as a gas storage part, outside air, especially dehumidified outside air (dry air) flows in and out of the part excluding the total volume of this and the oil storage part from the conservator internal volume. It is good also as such a structure. In this case, since the amount of outside air inhaled into the conservator is smaller than that of the conventional one, there is an advantage that at least the replacement period of the hygroscopic agent in the hygroscopic respirator can be extended.

  Moreover, this gas accommodating part is equipped with the structure which changes the form according to the flow of the said gas produced with expansion | swelling and shrinkage | contraction of the said insulating oil in outlines other than the part which contact | connects the oil accommodating part. Therefore, this structure preferably includes a deformable member at least partially. 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.

  It is preferable that a part or all of the deformable member is composed of a sheet-like body. Examples of such a sheet-like body 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.

  The sheet-like body is preferably formed so as to be able to accommodate all or part of the volume of the flowing gas. As such a form, for example, a sheet-like body or a balloon-like body (hereinafter collectively referred to as a bag-like body) may be used. Such a bag-like body can be attached to the upper end of the peripheral wall so as to remove the peripheral wall above the oil storage part of the conservator and cover the oil storage part from above. In addition, the bag-like body can be mounted by providing a through-hole that communicates with the outside on the conservator wall surface surrounding the gas accommodating portion and connecting the mouth in a state where the bag-like body is deflated. In the latter case, one end of the communication pipe may be connected to the through hole, and a bag-like body may be provided at the other end so that gas flows into and out of the bag-like body. By mounting the bag-like body in this manner, the bag-like body is inflated or deflated by gas flowing into and out of the bag-like body as the oil level rises and falls due to the expansion and contraction of the insulating oil. Can do. As a result, the bag-like body accommodates and discharges all or part of the volume of the flowing gas. When the bag-shaped body is made of an elastic material, the bag-shaped body expands and contracts with a change in volume compared to the case of a non-elastic material. There is an advantage that can be used.

  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. You may accommodate these gas in a gas accommodating part by connecting the said bag-shaped body to a conservator in the environment where these gases were filled.

  The gas pressure can be appropriately set, but specifically, it is preferably set to about 0.08 to 0.12 MPa in absolute pressure, more preferably about 0.09 to 0.11 MPa, and substantially large. It is particularly preferable to set the 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. The gas pressure can be confirmed by providing a pressure detector on the conservator wall. 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.

  Oil-filled equipment is often installed outdoors, and deterioration of the deformable member due to ultraviolet rays or the like must be taken into consideration. Even if oil-filled equipment is installed indoors, the influence of ultraviolet rays cannot be ignored. Accordingly, the deformable member such as the bag-like body or the sheet-like body can be covered from the outside using a cover. 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. The cover containing the deformable member can be fixed to the outer surface of the main body of the conservator or oil-filled electrical device.

  The conservator of the present invention can further be provided with a pressure regulator for adjusting the pressure of the gas. This pressure regulator usually consists of a setting regulator and a flow regulating valve controlled thereby, and operates when the gas pressure in the bag rises or falls excessively and breaks the bag. Is to prevent. As a specific operation, when the gas pressure is out of a predetermined allowable range, the flow rate adjustment valve is opened, and the outside air that has passed through the hygroscopic respirator is allowed to flow in and out, so that the gas pressure in the gas storage unit is predetermined. Within the allowable range. With this pressure regulator, the gas pressure can be maintained at an allowable pressure of the bag-like body and the service life of the bag-like body can be extended.

  As described above, according to the present invention, it is possible to prevent the outside air from being newly inhaled, so that a hygroscopic agent such as silica gel is unnecessary, and the cost and labor associated with the replacement of the hygroscopic agent can be reduced. It is possible to prevent dew condensation inside and corrosion of steel caused by this.

[Embodiment 1]
FIG. 1 is a diagram showing an example of an oil-filled device equipped with a conservator in Embodiment 1 of the present invention. Moreover, FIG. 2 is a figure which shows another example of the oil-filled apparatus which mounts the conservator in Embodiment 1. FIG. In FIGS. 1 and 2, the inlet and outlet of the insulating oil 102 in the main body container 100 are omitted. In these drawings, the same reference numerals are used for the same or common portions as those in FIG.

  As shown in FIG. 1, the conservator 150 includes an oil storage portion 151 in which the insulating oil 102 flowing from the tank 100 is stored, and a gas storage portion 152 in contact with the oil storage portion 151. The gas accommodating part 152 is comprised by the sealed space which uses the bag-like body 122 connected through the wall surface of the conservator 150 and the through-hole provided in the upper part as an outer shell. Inside this, dry air 120 is accommodated, and the pressure thereof is approximately atmospheric pressure.

  In FIG. 2, the bag-like body 122 is connected to a through-hole provided on the side wall on the upper side of the conservator 150, and a sealed space constituted by this and the wall surface of the conservator 150 is used as the gas accommodating portion 152. Inside the gas accommodating part 152, the dry air 120 of substantially atmospheric pressure is accommodated similarly to the above. By configuring the bag-like body 122 to be connected to the conservator side wall in this way, not only can the gas in the gas storage unit 152 be sealed, but also the height of the oil-filled device device can be kept low. There is an advantage that you can.

  As the bag-like body 122 shown in FIG. 1 or FIG. 2, a rubber sheet formed in a bag shape is used. It is desirable that the bag-like body 122 is connected so as to be replaceable, and should be able to be replaced periodically if it has deteriorated.

The maximum volume required to accommodate the dry air 120 for the bag-like body 122 can be calculated by the following method. That is, the expansion amounts of the insulating oil 102 and the dry air 120 in the gas storage unit 152 are calculated, and the results may be added. The calculation results are shown below for several oil temperature ranges. As is clear from these results, the required maximum volume of the bag-like body (indicated by V in the following formula) is determined in consideration of the capacity of the transformer, the volume of the conservator, the volume expansion coefficient of the insulating oil and gas, etc. can do.
For example, in the 110 kV, 20 MVA transformer 101, when it is assumed that the temperature change of the insulating oil is the largest (−10 to 80 ° C.), it can be calculated as follows. The above temperature range assumes a case where the transformer is stopped for a long time in winter and the transformer is overloaded in summer.
V = (expansion due to temperature rise of insulating oil) + (expansion due to temperature rise of conservator air)
= (Insulating oil amount x expansion rate x temperature rise value) + (volume of conservator air x expansion rate x temperature rise value)
= (18,000L × 0.0007 × 90K) + (1,400L × 0.00366 × 90K)
= 1,130L + 460L
= 1,590L
(However, the maximum temperature of the insulating oil is the average maximum oil temperature. The same shall apply hereinafter.)

Similarly, when it is assumed that the distribution transformer is operated in an overload state under normal use conditions (15 to 70 ° C.), the following results are obtained.
V = 1,590L × 55/90
= 970L

Further, assuming that the temperature change is in the range of 30 to 70 ° C., the following result is obtained. This temperature range assumes the case of overload operation in summer.
V = (expansion due to temperature rise of insulating oil) + (expansion due to temperature rise of conservator air)
= (Insulating oil amount x expansion rate x temperature rise value) + (volume of conservator air x expansion rate x temperature rise value)
= (18,000L × 0.0007 × 40K) + (1,400L × 0.00366 × 40K)
= 510L + 210L
= 720L

  Further, in both of the conservators shown in FIG. 1 and FIG. 2, a diaphragm 110 that isolates both is interposed at the interface between the insulating oil 102 and the dry air 120. By interposing the diaphragm 110 in this way, contact with the dry air 120 is cut off, and the deterioration of the insulating oil 102 can be prevented more reliably. For the 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. The diaphragm 110 can be fixed by sandwiching the outer peripheral portion thereof with a flange surface that divides the conservator 150 vertically. In the present invention, as described above, the gas containing portion 152 is configured in a state in which the circulation with the outside air is cut off, and the diaphragm 110 is provided, so that it is possible to reliably prevent the occurrence of condensation in the conventional conservator. it can.

  The conservator 150 can be provided with a pressure detector (not shown) on its wall surface. By using this to monitor the pressure fluctuation of the dry air 120 when the bag-like body 122 expands and contracts, it is possible to detect the damaged state of the bag-like body 122. In this monitoring, the pressure of the dry air 120 may be adjusted using a pump or a gas release valve (not shown) to facilitate detection by the pressure detector.

  Further, the bag-like body 122 is covered with a steel plate cover 124 to prevent deterioration due to ultraviolet rays or the like. The cover 124 is formed with a vent so that the air inside can be discharged to the outside when the bag-like body 122 is inflated. By providing the vents in this way, the bag-like body 122 can be smoothly expanded and contracted. 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.

The oil temperature of the insulating oil 102 rises due to the start of operation of the transformer 101 and an increase in load. Along with this, the oil level of the oil container 151 in the conservator 150 rises, causing the diaphragm 110 to expand upward, and the air in the gas container 152 connected thereto flows into the bag-like body 122, The bag-like body 122 is inflated.
On the other hand, when the load on the transformer 101 is reduced, the oil temperature of the insulating oil 102 is lowered, the oil level in the oil containing portion 151 is lowered due to the oil contraction, and the diaphragm 110 is lowered downward. The dry air 122 that has flowed into the shape body 122 flows into the gas accommodating portion 152 again.
Thus, due to the load fluctuation of the transformer 101, the dry air in the gas storage unit 152 repeats the flow between the storage unit 152 and the bag-like body 122 in a state where the circulation with the outside air is blocked, The form of the gas accommodating part 152 is changed by inflating or shrinking the bag-like body 122.

[Embodiment 2]
FIG. 3 is a diagram showing an example of an oil-filled device equipped with the conservator in the second embodiment. In FIG. 3, a through-hole is further provided on the upper wall surface of the conservator 150, and the communication pipe 105 is connected to the through-hole. It is connected. A bag-like body 122 formed of a rubber sheet is attached to the tip of the communication pipe 105. The bag-like body 122 is covered with a steel cover 126. The cover 126 is provided with a vent hole in the lower part thereof, and outside air flows in and out by expansion and contraction of the bag-like body 122. It is preferable that the bag-like body 122 be removed from the tip of the communication pipe 105 and exchanged when the bag-like body 122 deteriorates or periodically. In FIG. 3, as in FIGS. 1 and 2, the inlet and outlet of the insulating oil 102 are omitted.

  Another communication pipe 132 is branched from the middle of the communication pipe 105, a pressure regulator 130 is installed in the middle, and a hygroscopic respirator 104 in which a desiccant (silica gel or the like) is enclosed is installed at the tip. Has been. An oil pot 134 is attached to the lower surface of the hygroscopic respirator 104.

  The pressure regulator 130 includes a setting regulator (not shown) and a flow rate regulating valve (not shown) controlled thereby. The setting controller and the flow rate adjusting valve may be configured as an integral type or may be configured as separate bodies. For example, when the pressure of the dry air 120 in the gas storage unit 152 exceeds a predetermined range, the pressure regulator 130 opens the flow rate adjustment valve (not shown) to release the internal dry air 120, and the pressure When the pressure returns to within a predetermined range (usually approximately atmospheric pressure), the flow regulating valve is closed. On the other hand, when the pressure of the dry air 120 is less than a predetermined range, for example, a negative pressure, a flow rate adjustment valve (not shown) is opened to suck in the outside air dehumidified through the oil pot 134 and the hygroscopic respirator 104, and the pressure When the pressure returns to within a predetermined range (usually approximately atmospheric pressure), the flow regulating valve is closed. In this way, the service life of the bag-like body 122 can be extended by regulating the pressure of the dry air 120 in the gas storage unit 152 to a predetermined range. Further, since the outside air is only temporarily inhaled for a short time, as a result, the replacement cycle of the hygroscopic agent such as silica gel can be extended, and the labor and cost associated with the replacement of the hygroscopic agent can be reduced. Note that this pressure regulator 130 is also provided with a through-hole in the peripheral wall surrounding the gas accommodating portion 152 in the conservator 150 in the first embodiment, and the pressure regulator 130 is installed via a communication pipe connected thereto. Needless to say, the bag-like body can be prevented from being damaged. In this case, the pressure regulator 130 may be provided instead of the pressure detector or may be provided together.

  In the conservator 150 of the second embodiment, the diaphragm 110 shown in the above embodiment is provided between the dry air 120 and the insulating oil 102 in the above embodiment. The conservator 150 may be provided with a pressure detector.

  In consideration of the case where the bag-like body 122 is torn, a hygroscopic respirator in which a hygroscopic agent such as silica gel is sealed may be separately arranged in the connection portion of the bag-like body 122 in the upper part of the conservator 150. . In such a case, for a short period of time until the replacement of the bag-shaped body 122, outside air flows from the damaged portion of the bag-shaped body 122 through this hygroscopic respirator. However, in fact, this is a rare case, so even if the hygroscopic respirator is installed as described above, the replacement cycle of the hygroscopic agent such as silica gel can be extended, and the hygroscopic agent can be replaced. Can reduce the cost and labor involved.

  The second embodiment of the present invention is also suitable for remodeling an existing conservator. That is, there is an advantage that an existing conservator can be easily remodeled to the conservator of the present invention by providing a predetermined through-hole in the gas accommodating portion above the existing conservator and connecting the communication pipe 105 to the opening.

[Embodiment 3]
FIG. 4 is a diagram illustrating an example of an oil-filled device on which the conservator according to Embodiment 3 is mounted. In this figure, the upper part of the conservator 150 is open to the atmosphere, and a substantially rectangular opening is provided upward. A sheet-like body 123 made of a rubber sheet is disposed at a predetermined height on a peripheral wall that stands up to surround the opening. Below the sheet-like body 123, a gas accommodating portion 151 in which dry air 120 is sealed is formed, and the sheet-like body 123 is isolated from the outside air on the upper side. 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. As a result, the insulating oil 102 can be prevented from deteriorating and consequently the insulation performance can be prevented from being lowered. Is possible. Note that the inlet and outlet of the insulating oil 102 are omitted.

  FIG. 5 is a diagram illustrating an example of attachment of the sheet-like body 123. As shown in FIG. 5, the sheet-like body 123 can be fixed by sandwiching the outer periphery thereof with a flange surface that divides the conservator 150 vertically. According to such a fixing method, replacement when the sheet-like body 123 deteriorates or periodic replacement becomes easy.

  As shown in FIG. 4, the conservator 150 in the third 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 to isolate the two. As shown in FIG. 5, the diaphragm 110 can also be fixed by sandwiching its outer peripheral portion with another flange surface that divides the conservator 150 in the same manner as the sheet-like body 123.

  In addition, as shown in FIG. 5, a spacer 127 can be disposed in a sealed space between the diaphragm 110 and the sheet-like body 123. 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 in a box shape in this way, the box can be filled with a hygroscopic material such as silica gel, and as a result, complete dehumidification of the gas sealed under the sheet-like body 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 as in the first embodiment. A through-hole is provided in the peripheral wall of the gas storage unit 152, and a pressure regulator is attached via a communication pipe connected to the through-hole. The pressure regulator can damage the sheet-like body in the same manner as in the second embodiment. It can also be configured to prevent. Furthermore, an oil level gauge (not shown) may be provided on the side wall of the conservator 150 so that an inspector can visually inspect.

  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 according to 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. A deformable member such as the bag-like body 122 or the sheet-like body 123 is deformed. Accordingly, since the breathing action of the oil-filled device can be handled only inside 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. Further, the deformable member such as the bag-like body 122 can be easily replaced.

  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 in Embodiment 1. FIG. It is a figure which shows another example of the oil-filled apparatus which mounts the conservator in Embodiment 1. FIG. It is a figure which shows an example of the oil-filled apparatus carrying the conservator in Embodiment 2. FIG. 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 apparatus which mounts the conservator in Embodiment 3. FIG. It is a figure which shows an example of the conventional oil-filled transformer carrying a conservator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Tank 101 Transformer 102 Insulating oil 104 Hygroscopic respirator 105,132 Communication pipe 107 Connection pipe 108 Air 110 Diaphragm 120 Dry air 122 Bag-like body 123 Sheet-like body 124,125,126 Cover 127 Spacer 130 Pressure regulator 150 Conservator 151 Oil container 152 Gas container 160 Oil-filled transformer

Claims (9)

  An oil-filled electrical device in which insulating oil is sealed, an oil storage portion that is connected to the oil-filled electrical device and that stores the insulating oil that has flowed from the oil-filled electrical device, and is in contact with the oil storage portion. And a gas storage part for storing gas in a state where the circulation is cut off, and the gas storage part changes its form in response to the flow of the gas generated as the insulating oil expands and contracts. A conservator characterized by having a structure.   The conservator according to claim 1, wherein the structure includes a deformable member.   The conservator according to claim 2, wherein a part or all of the deformable member is formed of a sheet-like body.   The conservator according to claim 3, wherein the sheet-like body is formed in a bag shape.   The conservator according to any one of claims 2 to 4, wherein the deformable member is made of an elastic material.   The conservator according to any one of claims 2 to 5, wherein the gas accommodating portion includes a cover that covers the deformable member.   The conservator of any one of Claims 1-6 by which the diaphragm which isolates both is provided in the interface of the said oil accommodating part and the said gas accommodating part.   The conservator according to any one of claims 1 to 7, wherein the gas storage unit includes a pressure adjustment unit capable of adjusting a pressure of the gas to be stored. An oil-filled electrical device comprising the conservator according to any one of claims 1 to 8.

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