Structure of pressurized space of oil-filled device, and oil-filled device

Abstract

To provide a structure of a pressurized space of an oil-filled apparatus and the oil-filled apparatus capable of preventing suction of muddy water without causing a trouble in monitoring and maintenance of a moisture absorption respirator.SOLUTION: A transformer 200 includes a body tank 1 for storing an electric apparatus in an insulating oil 6, a conservator 2 connected to the body tank 1 via a connecting pipe for adjusting a volume change of the insulating oil 6, a moisture absorption respirator 5 for performing a breathing action between air in the conservator 2 and outside air, and a vent pipe 4 between the moisture absorption respirator 5 and the conservator 2. A bypass chamber 31 having an opening / closing mechanism 10 by a float 37 is provided in the middle of the vent pipe 4. The opening / closing mechanism 10 includes an intake pipe 34 provided above the bypass chamber 31, an outside air chamber 35 communicating with the intake pipe 34, and a valve body 38 that opens an opening portion S of the outside air chamber 35 when a float 37 floats.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a space that is pressurized by volumetric changes in insulating oil in oil-filled equipment, i.e., a structure of a pressurized space from a moisture-absorbing respirator used to prevent deterioration of insulating oil to a conservator, and to an oil-filled equipment equipped with said structure. [Background technology]

[0002] Oil-filled equipment (for example, static equipment such as oil-filled transformers) has an air chamber on top of the oil-filled equipment body or in a dedicated container to absorb volume changes in the insulating oil caused by temperature changes.

[0003] The interior of such an air chamber is called a pressure relief space, and a dedicated container for absorbing volume changes of insulating oil, for example, is called a conservator (see Patent Documents 1 and 2). In addition, tanks and conservators for oil-filled equipment are equipped with moisture-absorbing respirators (see Patent Document 3), which remove moisture from the pressurized space to prevent deterioration of the insulating oil or the rubber diaphragm, which will be described later.

[0004] The general device configuration of an oil-immersed transformer 100 (hereinafter referred to as transformer 100) equipped with a conservator will be described with reference to Figure 6. This transformer 100 houses an internal structure 101, i.e., a structure in which a primary coil (N1) and a secondary coil (N2) are wound around a common iron core, in a main tank 1. It is equipped with a conservator 2 connected to the top of this main tank 1 through a connecting pipe 3, a vent pipe 4 extended further above the conservator 2, and a moisture-absorbing respirator 5 installed at the tip of the vent pipe 4.

[0005] The main tank 1 is filled with insulating oil 6, and the conservator 2 is divided by a rubber diaphragm 8 into a space filled with insulating oil 6 and a pressure relief space 7 that is not filled with insulating oil 6. The conservator 2 is equipped with an oil level gauge 9 that moves in conjunction with the movement of the rubber diaphragm 8.

[0006] The amount of expansion and contraction of the insulating oil 6 due to temperature changes is adjusted by the conservator 2. In other words, the insulating oil 6 of the transformer 100 generally becomes hot and expands as the load increases and the outside temperature rises during the day, and becomes colder and contracts in volume at night as the load decreases and the outside temperature drops.

[0007] The expansion and contraction of the insulating oil 6 due to temperature rises and falls caused by changes in the outside air temperature and the transformer load causes changes in the oil level in the main tank 1 and the conservator 2, as well as the volume of the pressure relief space 7. This causes the air in the conservator 2 to move in and out of the outside air through the moisture absorbing respirator 5, i.e., breathing occurs.

[0008] The moisture-absorbing respirator 5 will be explained with reference to Figure 7. This moisture-absorbing respirator 5 has a structure in which a respirator 24 is attached below a moisture absorber 21 that contains a moisture-absorbing material 22. This moisture-absorbing material 22 adsorbs moisture from the outside air that flows in through the ventilation holes.

[0009] The moisture absorption performance of the moisture absorbent 22 decreases as the amount of moisture absorbed increases, but silica gel or the like is used, which changes color as it absorbs moisture, making it possible to visually check the degree of moisture absorption. This is because, during monitoring and maintenance, this color change can be confirmed through a viewing window 23 provided on the side of the moisture absorber (container) 21, and the moisture absorbent 22 can be replaced as necessary.

[0010] In addition, in order to prevent the moisture absorbent material 22 stored in the moisture absorber 21 from absorbing moisture unrelated to the original breathing action by constantly being in contact with the atmosphere, a respirator 24 containing partition oil 26 is provided below the moisture absorber 21, so that breathing passes through an oil layer.

[0011] This oil layer also contains an absorbent to remove moisture from the partition oil 26. The operating status of the moisture-absorbing respirator 5 is checked visually from the outside by observing the state of bubbles that form in the partition oil 26 placed in a glass oil pan 25. As the partition oil 26 collects dust and other particles floating in the air, the oil may gradually become contaminated. Therefore, during monitoring and maintenance, the oil is checked for contamination and replaced as necessary. In this respect, the moisture-absorbing respirator 5 requires monitoring of the status of the moisture absorbent 22 and the partition oil 26 and maintenance for replacement. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent Publication No. 2014-53278 [Patent Document 2] Patent Publication No. 2019-145720 [Patent Document 3] Patent Publication No. 2023-82655 Summary of the Invention [Problem to be solved by the invention]

[0013] When the area around the installation site of the transformer 100 is flooded, there is a risk that the transformer 100 will inhale muddy water due to the respiration, as indicated by arrow P in FIG.

[0014] More specifically, if the suction volume of the turbid water is larger than the combined volume of the pressurized space leading to the conservator 2, i.e., the ventilation pipe 4 and the hygroscopic respirator 5, the turbid water will infiltrate into the pressure relief space 7 inside the rubber diaphragm 8. In this case, the rubber diaphragm 8 that has been infiltrated by the turbid water, which has a higher specific gravity than the insulating oil, will sink into the insulating oil 6, behaving differently from the infiltration of air, and this may hinder the oil level gauge 9 from displaying the oil level accurately.

[0015] Furthermore, if undetected microcracks or the like occur in the rubber diaphragm 8, turbid water may get mixed into the insulating oil 6, impairing its insulating properties and potentially requiring the complete replacement of the insulating oil 6 and even the internal equipment.

[0016] Furthermore, if the rubber diaphragm 8 is exposed to turbid water for a long period of time, chemical changes such as hydrolysis may accelerate deterioration.

[0017] Therefore, it is possible to adopt a measure to install the moisture absorbing respirator 5 at a position higher than the expected flood height, but this may cause problems in monitoring and replacement maintenance of the moisture absorbent material 22 and partition oil 26.

[0018] The present invention has been made to solve these conventional problems, and its problem is to prevent the inhalation of muddy water during flooding without interfering with the monitoring and maintenance of the hygroscopic respirator. [Means for solving the problem]

[0019] (1) One aspect of the present invention is a structure of a space that is pressurized by a volume change of insulating oil in an oil-filled device, The oil-filled equipment is an equipment container for storing electrical equipment in the insulating oil; a conservator connected to the equipment container via a connecting pipe and configured to adjust a volume change of the insulating oil; a moisture absorbing respirator that performs a respiration action between the air in the conservator and the outside air; a ventilation pipe between the moisture absorbing respirator and the conservator; Equipped with A bypass chamber equipped with an opening and closing mechanism using a float is provided in the middle of the ventilation pipe.

[0020] (2) Another aspect of the present invention is an equipment container that houses electrical equipment and is filled with insulating oil; a conservator connected to the equipment container via a connecting pipe and configured to adjust a volume change of the insulating oil; a ventilation pipe between the moisture absorbing respirator and the conservator; The oil-filled equipment is configured to include the bypass chamber. [Effects of the Invention]

[0021] According to the present invention, it is possible to prevent the intake of muddy water during flooding without interfering with the monitoring and maintenance of the moisture-absorbing respirator. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is a longitudinal sectional view of an oil-immersed transformer having a bypass chamber according to the first and second embodiments. [Figure 2] FIG. 3 is a longitudinal cross-sectional view of the bypass chamber of the first embodiment. [Figure 3] A longitudinal cross-sectional view of the bypass chamber when flooded. [Figure 4] FIG. 10 is a longitudinal cross-sectional view of a bypass chamber according to a second embodiment. [Figure 5] A longitudinal cross-sectional view of the bypass chamber when flooded. [Figure 6] FIG. 1 is a longitudinal cross-sectional view of a conventional oil-immersed transformer. [Figure 7] A longitudinal cross-sectional view of the same moisture-absorbing respirator. [Figure 8] FIG. 7 is a longitudinal cross-sectional view showing the state of suction of turbid water when the area around the installation location of the oil-immersed transformer in FIG. 6 is flooded. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following describes the structure of a pressurized space in an oil-filled device according to an embodiment of the present invention. This structure is applied to stationary equipment such as an oil-filled transformer. In this case, a bypass chamber is provided in the space that is pressurized due to volumetric changes in the insulating oil in the oil-filled device, i.e., the pressurized space that runs from the moisture absorbing respirator used to prevent deterioration of the insulating oil to the conservator.

[0024] Reference numeral 200 in Fig. 1 denotes an oil-filled transformer equipped with bypass chambers 31 and 51 of Examples 1 and 2. This oil-filled transformer 200 (hereinafter abbreviated as transformer 200) is configured in a manner similar to that of the transformer 100 in Fig. 1. Here, the same components will be described using the same reference numerals.

[0025] That is, the transformer 200 has an internal structure 101 housed in a main tank 1, i.e., a structure in which a primary coil (N1) and a secondary coil (N2) are wound around a common iron core, and is equipped with a conservator 2 connected to the top of the main tank 1 through a connecting pipe 3, a vent pipe 4 extended further above the conservator 2, and a moisture-absorbing respirator 5 installed at the tip of the vent pipe 4, and is similar to the transformer 100 in that the inside of the conservator 2 is divided by a rubber diaphragm 8 into a space filled with insulating oil 6 and a pressure relief space 7.

[0026] However, the transformer 200 differs from the transformer 100 in that the bypass chambers 31, 51 are provided in the middle of the vent pipe 4 that connects the conservator 2 and the moisture-absorbing respirator 5. That is, the vent pipe 4 has vent pipes 4a, bb, the upper part of the conservator 2 and the upper part of the bypass chambers 31, 51 are connected by the vent pipe 4a, and the lower part of the bypass chambers 31, 51 and the upper part of the moisture-absorbing respirator 5 are connected by the vent pipe 4b, and it is preferable that the bypass chambers 31, 51 are provided at a high place. [Example]

[0027] The bypass chamber 31 of the first embodiment will be described with reference to Fig. 2. The bypass chamber 31 includes a substantially cylindrical container body 31a with a bottom, an upper lid 44 that closes the upper end opening of the container body 31a, and an opening / closing mechanism 10 that introduces outside air into the interior.

[0028] The container body 31a has a side wall (peripheral wall) 31b standing on the edge of the bottom wall 31c. Here, a top lid 44 is removably attached to the upper end of the side wall 31b by known means such as screw fastening.

[0029] A connecting pipe seat 33 is attached to the upper part of side wall 31b, and a connecting seat 32 is attached to the lower part of side wall 31b. One end of vent pipe 4a is connected to connecting pipe seat 33, and one end of vent pipe 4b is connected to connecting seat 32. The other end of vent pipe 4a is connected to connecting pipe seat 2a attached to the upper part of conservator 2, and the other end of vent pipe 4b is connected to the upper part of humidifier 21.

[0030] A notch 31f is formed on the underside of the connecting pipe seat 33 of the side wall 31b, and monitoring window seats 31d are fixed above and below the notch 31f by means of screws, fastening, or the like. A monitoring window 43 is fixed to this monitoring window seat 31d via a gasket 31e. This monitoring window 43 is made of a transparent plate, and when muddy water enters the bypass chamber 31 due to flooding around the installation location of the transformer 200 (hereinafter referred to as flooding of the transformer 200), the amount of water can be confirmed within the range of the monitoring window 46.

[0031] An intake plug 42 for adjusting the air pressure inside the bypass chamber 31 is attached to the top cover 44, and a drain plug 41 for draining water from the bypass chamber 31 is attached to the bottom wall 31c.

[0032] The bypass chamber 31 thus configured is provided with a hanging opening / closing mechanism using a float 37. When the bypass chamber 31 is flooded through the ventilation pipe 4b, the float 37 of this opening / closing mechanism 10 floats up to introduce outside air into the bypass chamber 31, preventing muddy water from flowing into the ventilation pipe 4b.

[0033] (1) Configuration example of opening / closing mechanism 10 The opening / closing mechanism 10 includes an intake pipe 34 formed in a generally inverted U shape attached to the top cover 44, an outside air chamber 35 in the bypass chamber 31 that communicates with the intake pipe 34, and a valve seat 36 for the outside air chamber 35, and has an opening S (see FIG. 3) formed in the valve seat 36, an inverted trapezoidal valve body 38 that can be fitted into the opening S, and a float 37 hanging down from the valve body 38. In this embodiment, the internal space of the bypass chamber 31 excluding the outside air chamber 35 is referred to as space R.

[0034] A filter 40 is provided inside the intake port 39a of the intake pipe 34, while the exhaust port 39b is located inside the outside air chamber 35. The outside air chamber 35 has a U-shaped vertical cross section, an upper end 35a fixed to the inner surface of the top cover 44, and a valve seat 36 whose lower end is bent inward.

[0035] The opening S of the valve seat 36 is formed as a cone-shaped hole, with an inner periphery 36a formed as an inclined surface. On the other hand, the valve element 38 is disposed in the outside air chamber 35, and the inclined surface 38a of the valve element 38 is formed as an inclined surface at the same angle as the inner periphery of the opening S, so that the valve element 38 can be fitted into the opening S as described above.

[0036] The upper end of the rod 11 is fixed to the bottom of the valve body 38, while the upper part of the float 37 is fixed to the lower end of the rod 11. Therefore, when the float 37 rises, the valve body 38 rises, and the valve body 38 is released from the opening S, opening the opening S. As a result, outside air is introduced from the intake pipe 34 through the outside air chamber 35 into the space R of the bypass chamber 31.

[0037] (2) Operation example of the opening and closing mechanism 10 In the normal operation of the transformer 100, as shown in Fig. 2, the rod 11 is pulled by the weight of the float 37, the valve body 38 is fitted into the opening S, and the opening S is closed. In this case, as shown by the arrow P1 in Fig. 2, the breathing action of the moisture absorbing respirator 5 is performed through the space R of the bypass chamber 31.

[0038] On the other hand, if the area around the installation location of the transformer 200 is flooded due to heavy rain or the like, there is a risk of turbid water being sucked in by the breathing action of the moisture absorbing respirator 5. Before the flooding, the insulating oil 6 of the transformer 200 becomes hot and expands due to the increase in load and outside air temperature.

[0039] However, if the area around the installation location of the transformer 200 becomes flooded, the transformer 200 will be disconnected from the electrical circuit, will be unloaded, and the surrounding water will cool the insulating oil 6, causing it to gradually cool and contract. As a result, as the oil level in the main tank 1 and the conservator 2 and the volume of the pressure relief space 7 decrease, suction through the moisture absorbing respirator 5 occurs.

[0040] At this time, in the transformer 100, if the suction volume exceeds the air volume in the moisture absorbing respirator 5, there is a risk that the surrounding muddy water will infiltrate into the conservator 2.

[0041] In contrast, in the transformer 200, as shown by the arrow P2 in FIG. 1, muddy water enters the space R via the vent pipe 4b, but the opening and closing mechanism 10 prevents the muddy water from entering the conservator 2.

[0042] Explaining this based on Figure 3, W in Figure 3 indicates muddy water that has flooded the space R, and the float 37 rises due to this muddy water W. This pushes up the valve body 38, releasing it from the opening S, and opening S is opened.

[0043] As a result, as shown by arrow P3, outside air is introduced into space R from intake pipe 34 via outside air chamber 35, and the introduced outside air is supplied to conservator 2 via vent pipe 4a. At this time, the air pressure of the introduced outside air prevents turbid water W from flowing into vent pipe 4a, and the turbid water is sucked into breathing apparatus 5 due to volume fluctuations in insulating oil 6, preventing the intrusion of turbid water or foreign matter into rubber diaphragm 8 of conservator 2.

[0044] Therefore, there is no need to adopt measures to position the hygroscopic respirator 5 above the expected flood height, which prevents the intake of turbid water during flooding without interfering with maintenance of the hygroscopic respirator. Furthermore, this embodiment enables the transformer 200 to resume operation more quickly after being flooded. In other words, if turbid water enters the conservator 2 and mixes with the insulating oil 7, the insulating properties may be impaired, requiring the complete replacement of the insulating oil 6 and even the replacement of the internal equipment. This would prolong the period during which the transformer 200 would be unavailable. However, this embodiment prevents the intrusion of turbid water during flooding, thereby preventing such a situation from occurring.

[0045] One possible measure to prevent this type of turbid water from being sucked in is to install a sealed container as a spare air chamber to accommodate the anticipated amount of turbid water that will get in. This method is effective when the amount of insulating oil 6 is small, but if the conservator 2 is large, the suction volume will increase, so the spare air chamber must be made larger.

[0046] In contrast, the bypass chamber 31 of this embodiment prevents the intrusion of muddy water by opening the outside air chamber 35, which draws in outside air instead of sucking in muddy water in the early stages of flooding, and is particularly effective in areas where the amount of insulating oil 6 is large.

[0047] In this way, the spare air chamber with a simple structure can be used as a conservator for the cut switch chamber with a small amount of oil, while the bypass chamber 31 of this embodiment can also be used as the conservator 2 for the main tank 1 with a large amount of oil, making it possible to implement thorough measures against flooding. Note that with the bypass chamber 31 of this embodiment, outside air is introduced without passing through the moisture absorbing respirator 5, so there is a risk that the dry state inside the conservator 2 cannot be maintained, but the damage is less than that of the transformer 100 because the intrusion of muddy water can be prevented. In this respect, damage can be minimized and the effort required to restore (restart) operation is reduced.

[0048] Furthermore, when restarting operation, it is necessary to check that the turbid water in the space R of the bypass chamber 31 has been discharged. However, according to this embodiment, the amount of turbid water can be checked through the monitoring window 46, which reduces the effort required to check the discharge and shortens the time required to restart operation.

[0049] In this case, the turbid water remaining in the space R can be drained directly from the drain plug 41, allowing the turbid water to be drained quickly, which also shortens the time until operation can be resumed. The provision of the air intake plug 42 makes it possible to prevent a decrease in the drainage speed and a drop in air pressure within the bypass chamber 31. The drain plug 41 is set directly below the float 37, so that the plug 41 can be opened and the float 37 can be moved up and down with a test rod (not shown) or the like, which also makes it possible to check the operation of the opening and closing mechanism 10 through the monitoring window 43.

[0050] Furthermore, there is a risk that mud and other substances that could not be discharged along with the muddy water may remain in the space R of the bypass chamber 31. In this case, the removable top cover 44 facilitates cleaning work to remove the mud and other substances. Therefore, if mud and other substances have adhered, the time required to remove the mud and other substances before restarting operation can be shortened. [Example]

[0051] The bypass chamber 51 of the second embodiment will be described with reference to Fig. 4. This bypass chamber 51 differs from the bypass chamber 31 in that it is provided with an opening and closing mechanism 20 instead of the opening and closing mechanism 10. The other configurations are the same as those of the bypass chamber 31.

[0052] The opening / closing mechanism 20 includes an inverted U-shaped intake pipe 55 provided at the top of the side wall 31b (above the connecting seat 32), an outside air chamber 56 on the bypass chamber side of the intake pipe 55, a valve seat 57 in the outside air chamber 56, a trapezoidal valve body 58 that fits into an opening S (see FIG. 5) of the valve seat 57, and a link part 61 and an arm 59 that release the valve body 58 from fitting into the opening S when the float 54 rises. In this embodiment, the internal space of the bypass chamber 31 excluding the outside air chamber 35 is also called space R.

[0053] The intake port 65a of the intake pipe 55 is located outside the bypass chamber 51. The exhaust port 65 is provided with a filter 66, while the valve seat 57 is fixed to the exhaust port 65b side of the outside air chamber 56. The opening S (see FIG. 5) of the valve seat 57 is formed in an inverted cone shape and communicates with the outside air chamber 56 through a communication hole C, with the inner periphery 57a formed as an inclined surface. On the other hand, the valve body 58 is located outside the outside air chamber 56, and the inclined surface 58a of the valve body 58 is formed as an inclined surface at the same angle as the inner periphery of the opening S, so that the valve body 58 can be fitted into the opening S as described above.

[0054] A support portion 60a is provided on the bottom wall 31c, and an arm 59 is rotatably supported on a central shaft 60 at the tip of the support portion 60a. One end of the arm 59 is rotatably connected to the valve body 58 via a link portion 61, and the other end of the arm 59 is connected to the float 54.

[0055] According to this embodiment, when the transformer 100 is in normal operation, the weight of the float 54 causes the arm 59 to rotate in the Y direction, so that the valve body 58 is lifted in the B direction and fitted into the opening S, which is then closed. In this case, as shown by the arrow P4 in Figure 4, the respiration action of the moisture absorbing respirator 5 is performed through the space R of the bypass chamber 51.

[0056] On the other hand, if the area around the installation location of the transformer 200 is flooded due to heavy rain or the like, and turbid water enters the space R through the ventilation pipe 4b due to the breathing action of the moisture-absorbing respirator 5, as shown by arrow P2 in Figure 1, the opening and closing mechanism 20 will prevent the turbid water from entering the conservator 2.

[0057] 5 indicates muddy water that has entered the space R, and the muddy water W causes the float 54 to rise. This causes the arm 59 to rotate in the X direction, and the valve body 58 is pulled in the direction of the arrow B, releasing it from the opening S.

[0058] As a result, as shown by arrow P5, outside air is introduced into the space R from the intake pipe 55 through the outside air chamber 56 and the communication hole C. At this time, the air pressure of the introduced outside air prevents the muddy water W from flowing into the ventilation pipe 4a, and the muddy water is sucked into the breathing apparatus 5 due to the volume fluctuation of the insulating oil 6, preventing the entry of muddy water and foreign matter into the rubber diaphragm 8 of the conservator 2.

[0059] Therefore, according to this embodiment, there is no need to adopt a measure to set the installation position of the hygroscopic respirator 16 above the expected flood height, as in the case of embodiment 1, and in this respect, it is possible to prevent the intake of muddy water in the event of flooding without causing any problems in the maintenance of the hygroscopic respirator. In this case, by also using the spare air chamber as a conservator for the cut switch room with little oil, it is possible to implement thorough flooding countermeasures as in embodiment 1.

[0060] The present invention is not limited to the above-described embodiments, and can be modified and implemented within the scope of the claims. For example, the present invention can be used not only for the transformer 200, but also for shunt reactors for distribution boards, voltage regulators, DC reactors, and other oil-filled devices that are subject to temperature changes from the standpoint of insulation and cooling. Furthermore, the transformer 200 incorporating the first and second embodiments also constitutes the present invention. [Explanation of symbols]

[0061] 1...Main tank (equipment container) 2...Conservator 4(4a, 4b)...Ventilation pipe 5…Hygroscopic respirator 6...Insulating oil 10, 20...Opening and closing mechanism 31,51...Bypass chamber 40,55...intake pipe 43...Observation window 44...Top lid 35,56...Outdoor air chamber 38,58...Valve body 41...Drain plug (drain part) 37,54...Float 59...Arm 60…Central axis 60a...Support part 61...Link 200...Oil-filled transformer (oil-filled equipment)

Claims

1. A structure of a space that is pressurized by a change in the volume of insulating oil in an oil-filled device, The oil-filled equipment is an equipment container for storing electrical equipment in the insulating oil; a conservator connected to the equipment container via a connecting pipe and configured to adjust a volume change of the insulating oil; a moisture absorbing respirator that performs a respiration action between the air in the conservator and the outside air; a ventilation pipe between the moisture absorbing respirator and the conservator; Equipped with A structure of a pressurized space in an oil-filled device, characterized in that a bypass chamber equipped with an opening and closing mechanism using a float is provided in the middle of the ventilation pipe.

2. The ventilation pipe is a first ventilation pipe connecting an upper portion of the bypass chamber and an upper portion of the conservator; a second ventilation pipe connecting an upper portion of the moisture absorbing respirator and a lower portion of the bypass chamber; Equipped with The structure of the pressurized space of the oil-filled equipment according to claim 1.

3. The opening and closing mechanism includes: When the bypass chamber is flooded through the second ventilation pipe, 3. The structure of the pressurized space of the oil-filled equipment according to claim 2, wherein the float rises and introduces outside air into the bypass chamber.

4. The opening and closing mechanism includes: an intake pipe provided at an upper portion of the bypass chamber; an outside air chamber communicating with the intake pipe; a valve body that opens the opening of the external air chamber when the float rises; Equipped with 4. The structure of the pressurized space of the oil-filled equipment according to claim 3.

5. The opening and closing mechanism includes: an intake pipe provided at an upper portion of the switchgear chamber; an outside air chamber provided on the bypass chamber side of the intake pipe; a valve body that fits into the opening of the outside air chamber; 4. The structure of the pressurized space of the oil-filled equipment according to claim 3, wherein the fitting of the valve body is released when the float rises.

6. The opening and closing mechanism includes: a link attached to the valve body; an arm between the float and the link; a support portion that pivotally supports the arm; Equipped with 6. The structure of the pressurized space of the oil-filled equipment according to claim 5, wherein the arm rotates to release the fitted position of the valve body when the float rises.

7. The side of the bypass chamber is There is a monitoring window that allows the interior to be seen.

4. The structure of the pressurized space of the oil-filled equipment according to claim 3.

8. At the bottom of the bypass chamber, 4. The structure of the pressurized space of the oil-filled equipment according to claim 3, further comprising a drainage section.

9. The upper cover of the air chamber is 4. The structure of the pressurized space of oil-filled equipment according to claim 3, characterized in that it is removable.

10. an equipment container that houses electrical equipment and is filled with insulating oil; a conservator connected to the equipment container via a connecting pipe and configured to adjust a volume change of the insulating oil; a ventilation pipe between the moisture absorbing respirator and the conservator; A bypass chamber according to any one of claims 1 to 9; An oil-filled device comprising:

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