JP2019216157A - Oil-immersed stationary induction apparatus - Google Patents

Abstract

To facilitate oil filling work for a structure including a vertically large-sized radiator on a side part of a body tank and a conservator above the body tank.SOLUTION: An oil-immersed stationary induction apparatus of an embodiment comprises: a body tank that stores an induction apparatus body and is filled with insulation oil; a radiator that is disposed on a side part of the body tank, is configured so as to include a plurality of heat dissipation panels between an upper header connected to an upper part of the body tank via an upper oil guide pipe and a lower header connected to a lower part of the body tank via a lower oil guide pipe, and is used for cooling the insulation oil; and a conservator that is disposed above the body tank and is used for absorbing thermal expansion/contraction of the insulation oil. The upper header of the radiator is positioned above the uppermost part of the body tank. The conservator is positioned below the upper header. A bottom of the conservator and the uppermost part of the radiator are connected via a connection pipe.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to an oil-filled stationary induction device.

  Oil-filled stationary induction equipment, such as oil-filled transformers for high-voltage power distribution equipment, house the transformer body together with the insulating oil in the main tank, and at the top of the main tank, to prevent the deterioration of the insulating oil. And a radiator for cooling the insulating oil on the side of the main body tank (for example, see Patent Document 1). FIG. 12 shows an appearance configuration of a conventional transformer 1 of this type in a state where a radiator on one side is removed.

  That is, as shown in FIGS. 13 to 16, the transformer main body 3 is accommodated in the main body tank 2 having a rectangular box shape together with the telephoto oil M, and a conservator 4 is provided on the upper part of the main body tank 2. Can be As shown in FIGS. 13 to 16, the upper part of the main body tank 2 and the bottom part of the conservator 4 are connected by a pipe 5, and as shown in FIG. A Buchholz relay 6 is provided for detecting the decomposition gas and operating the circuit breaker. A radiator 7 is provided on both sides (only one side is shown) of the main body tank 2.

  Although a detailed illustration and description are omitted, the so-called panel-type radiator 7 is configured by arranging a plurality of thin plate-shaped hollow radiator panels between upper and lower headers communicating with the main body tank 2. Radiator 7 is adopted. At this time, in order to increase the heat radiation effect while suppressing the installation area, the heat radiator 7 is increased in size in the height direction. As shown in FIGS. 13 to 16, the main tank 2 and the upper header are connected by an upper oil pipe 8, and the main tank 2 and the lower header are connected by a lower oil pipe 9.

  By the way, when the transformer 1 is installed, an operation of lubricating the insulating oil M is performed so as to fill the inside of the main body tank 2 and the radiator 7 (and the oil reservoir of the conservator 4). The procedure for lubricating the transformer 1 with the insulating oil M will be described with reference to FIGS. First, as shown in FIG. 13, before the start of the lubrication work, with the lubrication port 2 a of the main body tank 2 closed, the breathing port 7 a at the upper end of the radiator 7 and the breather connected to the conservator 4. The ends of the tubes 10 are connected to vacuum pumps, respectively, and are evacuated. Thus, the inside of the main body tank 2, the inside of the conservator 4, and the inside of the radiator 7 are all evacuated by vacuuming.

  Next, as shown in FIG. 14, a lubrication device (lubrication pump) is connected to the lubrication port 2a in a state where the evacuation from the vent port 7a and the breathing tube 10 is continued, and lubrication into the main body tank 2 is started. Is done. As a result, lubrication is gradually performed in the main body tank 2, and at this time, lubrication is advanced so that the inside of the main body tank 2 and the inside of the radiator 7 have the same oil level. After the main tank 2 is filled with the lubrication, the lubrication is also performed into the conservator 4 so that the oil level is the same as that in the radiator 7.

  Then, as shown in FIG. 15, when lubrication is performed to a required oil level in the conservator 4, lubrication stops, the lubrication port 2 a is closed, and the vent port 7 a and the distal end of the breathing tube 10. Is closed. In this state, the upper space S in the radiator 7 and the conservator 4 is in a vacuum state. Thereafter, as shown in FIG. 16, by opening the tip of the breathing tube 10, the atmosphere is introduced into the conservator 4, the oil level in the conservator 4 is lowered, and the insulating oil M is reduced accordingly. The insulating oil M is filled up to the upper end in the radiator 7 by being pushed back. By performing the lubrication operation in a state where the inside is evacuated, lubrication can be performed even if the height of the upper end of the radiator 7 is higher than the conservator 4.

JP-A-62-44420

  However, the transformer 1 having the above-described conventional configuration has a problem that the lubrication operation takes time and effort. Specifically, when the inside is evacuated, it is necessary to evacuate the air at two locations: the vent port 7a of the radiator 7 and the respiratory tube 10 of the conservator 4, which complicates the work process. And the lubrication work became troublesome. Further, after lubricating to a predetermined oil level in the conservator 4, the insulating oil M is pushed back so as to fill the upper space S in the radiator 7, so that it takes time and reliability. Was inferior.

  Therefore, there is provided an oil-filled stationary induction device which has a large radiator in the height direction on the side of the main body tank and a conservator above the main body tank, and can easily perform lubrication work. .

  The oil-filled stationary induction device according to the embodiment is disposed on a side portion of the main body tank in which the main body of the induction device is housed and filled with insulating oil, and is connected to an upper portion of the main body tank by an upper oil pipe. And a radiator configured to have a plurality of heat radiating panels between a lower header connected to the lower part of the main body tank and a lower oil guide pipe, and to cool the insulating oil, A conservator disposed above the main body tank for absorbing thermal expansion and contraction of the insulating oil, wherein the upper header of the radiator is located above the top of the main body tank, Is located below the upper header, and the bottom of the conservator and the top of the radiator are connected by a connection pipe.

1 is a perspective view showing the first embodiment and showing an entire configuration of a transformer before lubrication. Perspective view of transformer with one side radiator removed Side view of transformer with one side radiator removed Front view of one unit of radiator Perspective view of one unit of radiator Front view schematically showing the overall configuration of the transformer before lubrication Front view schematically showing the overall configuration of a transformer during lubrication (part 1) Front view schematically showing the overall configuration of a transformer during lubrication (part 2) FIG. 2 is a front view schematically showing the entire configuration of a transformer in a state where lubrication is completed. FIG. 4 shows the second embodiment, and is a front view schematically showing the overall configuration of a transformer before lubrication. FIG. 2 is a front view schematically showing the entire configuration of a transformer in a state where lubrication is completed. FIG. 2 is a perspective view schematically showing the entire configuration of a transformer, showing a conventional example. Front view schematically showing the overall configuration of the transformer before lubrication Front view schematically showing the overall configuration of a transformer during lubrication (part 1) Front view schematically showing the overall configuration of a transformer during lubrication (part 2) FIG. 2 is a front view schematically showing the entire configuration of a transformer in a state where lubrication is completed.

<First embodiment>
Hereinafter, a first embodiment applied to an oil-filled insulating transformer for high-voltage power distribution equipment will be described with reference to FIGS. 1 to 9. 1 to 3 show an overall configuration of an oil-filled insulating transformer 11 (hereinafter simply referred to as “transformer 11”) as an oil-filled stationary induction device according to the present embodiment. 4 and 5 show the configuration of one unit of the radiator. When the direction is referred to in the description of the present embodiment, the longitudinal direction of the main body tank is the front-back direction, and the side where the terminal box is attached to the radiator is the front side.

  As shown in FIGS. 1 to 3, a transformer 11 includes a main body tank 13 that houses a transformer main body 12 (see FIGS. 6 to 9) as an induction equipment main body, and left and right sides of the main body tank 13 in the drawing. A plurality of unit-shaped radiators 14 connected to the unit and a conservator 15 provided on an upper part of the main body tank 13 are provided. Although not shown in detail, the transformer main body 12 has a well-known configuration including an iron core and a coil mounted on the iron core. The main body tank 13 has a rectangular box shape that is long in the front-rear direction in the figure, and has an insulating oil M made of, for example, mineral oil therein (see FIGS. 7 to 9) so that the entire transformer main body 12 is immersed therein. Is filled. A plurality of bushings 16 for connecting the transformer body 12 (coil) to the outside are provided on the front surface of the body tank 13.

  A lubrication port 17 is provided at a lower portion of the front surface of the main body tank 13. The lubrication port 17 is configured to be openable and closable, and is configured to be connectable to a lubrication device (lubrication pump). Although not shown in detail, the conservator 15 has a tank shape that is slightly flat on the upper and lower sides with a storage portion for the rim oil M inside, and absorbs expansion and contraction of the insulating oil M due to a temperature change. It is configured. As described later, in the present embodiment, the conservator 15 is connected (communicated) to the radiator 14. As shown in FIGS. 6 to 9, a breathing tube 18 is connected to an upper part of the conservator 15.

  Here, the radiator 14 will be described with reference to FIGS. The radiator 14 is for cooling the insulating oil in the main body tank 13, and as shown in FIG. 1, a unit-shaped radiator 14 is provided on the left and right sides of the main body tank 13 in the drawing. A plurality (eight in the figure) are provided side by side in the front-rear direction. In the present embodiment, a so-called panel-type radiator is employed as the radiator 14. Specifically, as shown in FIGS. 4 and 5, each radiator 14 is made of a metal having good heat conductivity, and includes an upper header 19, a lower header 20, and a plurality of radiator panels connecting between them. 21 as a whole, and is configured in a vertically long rectangular block shape.

  Among them, the upper header 19 has a cylindrical pipe shape extending in the left-right direction in the figure, and has a front end closed and a base end connected to communicate with an upper oil guide pipe 22 described later. Although not shown in detail, cutouts into which the upper ends of the heat radiating panels 21 are inserted are provided at predetermined intervals in the left-right direction in the lower half of the outer peripheral surface of the upper header 19. The lower header 10 is also formed in a cylindrical pipe shape extending in the left-right direction in the figure, and has a distal end side closed and a base end side connected to communicate with a lower oil guide pipe 23 described later. Although not shown in detail, cutouts into which the lower ends of the heat radiating panels 11 are inserted are provided at predetermined intervals in the left-right direction in the upper half of the outer peripheral surface of the lower header 10.

  The heat dissipating panel 21 is vertically long in the figure, narrow in the front and rear direction, thin in the left and right direction, and has a thin plate shape in the inside thereof. An insulating oil flow hole (not shown) is provided. The plurality of heat dissipating panels 21 are arranged in parallel at regular intervals such that the plate surfaces (flat surfaces) face the left and right directions. At this time, the upper end of each of the heat radiating panels 21 is hermetically connected by welding or the like so that the insulating oil does not leak while being inserted into the cut portion of the upper header 19. At the same time, the lower end portion of each heat radiation panel 21 is connected in a sealed state so that insulating oil does not leak by welding or the like in a state of being inserted into the cut portion of the lower header 20.

  The main tank 13 and each radiator 14 are connected by an upper oil pipe 22 and a lower oil pipe 23, respectively. As shown in FIGS. 4 and 5, each of the upper oil guide pipes 22 extends laterally from an upper connection port 13 a (see FIGS. 2 and 3) at the upper end of the side surface of the main body tank 13 and then bends upward. And the upper end is connected to the base end of each upper header 19. Each of the lower oil guide pipes 23 extends laterally from a lower connection port 13 b (see FIGS. 2 and 3) at the lower end of the side surface of the main body tank 13 and is connected to the base end of each lower header 20.

  Thus, the insulating oil M heated by the heat of the transformer main body 12 in the main body tank 13 flows into each radiator 14 from each upper oil pipe 22 through the upper header 19 by convection. Then, in the radiator 14, the heat flows from the upper header 19 into each of the heat radiating panels 21, and is cooled by being exchanged with the outside while descending inside the heat radiating panel 21. Thereafter, circulation is performed such that the heat flows from the heat radiating panel 21 to the lower header 20, passes through the lower oil guide pipe 23, and returns to the main body tank 13. By circulating the insulating oil M in this manner, the insulating oil in the main tank 13 is cooled.

  At this time, in the present embodiment, as shown in FIGS. 1 to 3, the upper header 19 of the radiator 14 is located above the top of the main body tank 13, and the conservator 15 is It is located below the header 19. As shown in FIG. 1 and the like, a terminal box 24 is provided at a lower part of the front of the radiator 14, which is located at the forefront of the right side of the main tank. Although not shown, the conservator 15 is provided with a confirmation window for visually checking the height of the oil level inside. Alternatively, an oil level gauge for detecting the oil level may be provided.

  Now, in the oil-filled transformer 11 of the present embodiment, as shown in FIGS. 2 and 3, the conservator 15 and the main body tank 13 are not directly connected to each other. The bottom and the top of each radiator 14 are connected by a connection pipe 25. At this time, as shown in FIGS. 4 and 5, a connection port 19 a is provided above the base end portion (connection portion with the upper oil guide pipe 22) of the upper header 19 of each radiator 14.

  2 and 3, the connection pipe 25 extends rearward from the bottom of the conservator 15, bends at the rear end of the main body tank 13, and extends upward. It extends forward along the sides. At this time, the uppermost portion of the connection pipe 25 extending in the front-rear direction is connected to the connection port 19a of each radiator 14. Although not shown, the connection pipes 25 are similarly connected to the connection ports 19a of the radiators 14 on the left side of the main body tank 13, respectively.

  Further, in the present embodiment, as shown in FIGS. 2 and 3, a protective relay is provided at an intermediate portion of the connection pipe 25, in this case, at the rear end side of the uppermost portion, above the radiator 14. Buchholz relay 26 is provided. As is well known, the Buchholz relay 26 operates the circuit breaker based on detection of the decomposition gas generated from the insulating oil M when an abnormality occurs in the main body tank 13 to stop the power supply to the transformer main body 2 and the like. Things.

  In the transformer 11 configured as described above, the insulating oil M is filled so as to fill the inside of the main body tank 13, the radiators 14, and the storage sections of the conservator 15. The work of lubricating the insulating oil M is performed from the lubrication port 17 when the transformer 11 is assembled (installed). In this case, since the height of each radiator 14 is higher than that of the main body tank 13, lubrication is performed while the inside is evacuated in order to fill the insulating oil M to the upper part of the radiator 14. Here, the procedure of lubricating the transformer 11 with the insulating oil M will be described with reference to FIGS.

  That is, as shown in FIG. 6, first, before the lubrication operation for the transformer 11 is started, the breathing pipe 18 is connected to a vacuum pump and evacuated while the lubrication port 17 is closed. Thus, the inside of the main body tank 13, the inside of each radiator 14, and the inside of the conservator 15 are all evacuated by vacuuming. Next, as shown in FIG. 7, the lubrication operation is started, a lubrication device (lubrication pump) is connected to the lubrication port 17, and lubrication into the main body tank 13 is performed. At this time, the evacuation from the breathing tube 18 is continued, and the internal reduced pressure state is maintained.

  As a result, the inside of the main body tank 13 and the inside of the radiator 14 connected to the main body tank 13 by the lower oil pipe 23 are gradually filled with oil so as to have the same oil level. When the insulating oil M fills the entire inside of the main body tank 13, as shown in FIG. 8, the oil is further injected into the radiator 14 from the inside of the main body tank 13 through the lower oil guide pipe 23 and the upper oil guide pipe 22. At this time, since the inside of the radiator 14 is in a depressurized state, the radiator 14 is filled with oil beyond the height of the main body tank 13.

  As the lubrication further proceeds, as shown in FIG. 8, the inside of the radiator 14 also becomes filled with the insulating oil M, and the insulating oil M is injected into the conservator 15 through the connection pipe 25. . The operator checks the oil level in the conservator 15 through the confirmation window, and stops oiling from the oil inlet 17 when the oil level reaches a predetermined height. As shown in FIG. 9, the lubrication operation is completed by closing the lubrication port 17 and opening the breathing tube 18.

  According to this embodiment, the following operation and effect can be obtained. That is, in the transformer 11 of the present embodiment, the upper header 19 of the radiator 14 is located above the uppermost part of the main tank 13, and the conservator 15 is located below the upper header 19. Therefore, the size of the radiator 14 can be increased in the vertical direction, and the heat radiation effect can be enhanced while the installation area is suppressed. Since the conservator 15 is located at a position lower than the radiator 14, the transformer 11 does not become unnecessarily large in the vertical direction.

  At this time, unlike the case where the bottom of the conservator 4 and the top of the main body tank 2 are connected by the pipe 5 as described in the conventional example, the bottom of the conservator 15 and the top of the radiator 14 are connected. They are connected by a tube 25. Therefore, the flow of the insulating oil M during operation is from the inside of the main body tank 13 to the conservator 15 via the radiator 14. The insulating oil M flows into the conservator 15 through the connecting pipe 25, and when the insulating oil M thermally contracts, the insulating oil M flows out of the conservator 15 to the radiator 14 through the connecting pipe 25 by the contracted amount. Thus, even if the connection form is changed, the necessary functions as the conservator 15 can be secured.

  Then, in the lubrication work for the transformer 11, as described above, it is only necessary to evacuate the breathing tube 18 of the conservator 15, and only one place is evacuated. Further, when lubrication is completed to a predetermined oil level in the conservator 15, the lubrication operation is completed. Therefore, it is not necessary to push back the insulating oil M after lubrication, and a required amount of lubrication can be surely performed. As a result, according to the present embodiment, a large radiator 14 is provided on the side of the main body tank 13 in the height direction and the conservator 15 is provided above the main body tank 13. The lubrication operation can be easily performed, unlike the related art, which has to be pulled, requires time for the lubrication operation, and is inferior in reliability.

  In the present embodiment, a protective Buchholz relay 26 is provided in the middle of the connection pipe 25 at a position higher than the radiator 14. According to this configuration, the decomposition gas generated from the insulating oil M when an abnormality occurs in the main body tank 13 rises in the main body tank 13, enters the radiator 14 through the upper oil guide pipe 22, and further enters the radiator 14. The gas reaches the connection pipe 25 from the inside, and the gas is detected by the Buchholz relay 26. Therefore, the generated gas is always collected in the connection pipe 25, so that the generation of gas can be reliably detected by the Buchholz relay 26 without any omission of detection.

<Second embodiment, other embodiments>
FIGS. 10 and 11 show a transformer 31 according to the second embodiment. The second embodiment differs from the first embodiment in the following points. That is, the transformer 31 also includes the main body tank 13 accommodating the transformer main body 12, the radiator 14, and the conservator 15, and the upper header 19 of the radiator 14 is located above the top of the main body tank 13. The conservator 15 is located below the upper header 19.

  In the second embodiment, the top of the radiator 14 (connection port 19a) and the bottom of the conservator 15 are connected by a first connection pipe 32 as a connection pipe, and A second connection pipe 33 that connects between the upper part and the bottom part of the conservator 15 is provided. At this time, the lower end side of the first connection pipe 32 is connected to an intermediate part of the second connection pipe 33. A first opening / closing valve 34 is provided in the middle of the first connection pipe 32, and is provided below the middle of the second connection pipe 33, in this case, below the connection of the first connection pipe 32 (the main tank 13). Side) is provided with a second on-off valve 35. Further, a Buchholz relay 36 as a protective relay is provided in the middle of the second connecting pipe 33, in this case, above the connecting part of the first connecting pipe 32 (on the side of the conservator 15).

  In this configuration, when performing the lubrication work on the transformer 31, as shown in FIG. 10, the first on-off valve 34 of the first connection pipe 32 is opened, and the second on-off valve 35 of the second connection pipe 33 is closed. In this state, the breathing tube 18 is connected to a vacuum pump and evacuated. In this state, the insulating oil M is supplied from the oil supply port 17 of the main body tank 13. Then, similarly to the first embodiment, the oil level rises while maintaining the same oil level in the main body tank 13 and the radiator 14, and after the main body tank 13 is filled, the oil is further injected into the radiator 14. Then, the oil reaches the upper end of the radiator 14, and then the conservator 15 is lubricated through the first connection pipe 32. When lubrication is performed up to a predetermined oil level in the conservator 15, the lubrication operation ends.

  Thereafter, when operating as the transformer 31, the first on-off valve 34 of the first connection pipe 32 is closed and the second on-off valve 35 of the second connection pipe 33 is opened as shown in FIG. . By such proper use, the thermal expansion and thermal contraction of the insulating oil M in the main body tank 13 are absorbed by flowing between the insulating oil M and the conservator 15 through the second connection pipe 33. Further, the function as the radiator 14 is performed. Then, the decomposition gas generated at the time of occurrence of the abnormality passes through the second connection pipe 23 from above the main body tank 13 and is detected by the Buchholz relay 36.

  According to the second embodiment, a large radiator 14 is provided on the side of the main body tank 13 in the height direction and a conservator 15 is provided above the main body tank 13. By switching the opening and closing of the valve 34 and the second on-off valve 35, the same operation as in the first embodiment can be performed at the time of lubrication work, so that the lubrication work can be easily performed. When the transformer 31 is operated, the main tank 13 and the conservator 15 can be directly connected by switching between opening and closing of the first on-off valve 34 and the second on-off valve 35. The thermal expansion and contraction of the insulating oil M can be absorbed without passing through. Further, the gas that has passed through the second connection pipe 33 from the upper part of the main body tank 13 can be detected by the Buchholz relay 36, so that a quicker response is possible.

  In the above embodiment, the Buchholz relay is used as the protection relay. However, for example, another hydraulic relay, a gas detection relay, or the like may be used. Various changes can also be made to the position where the protective relay is provided. Further, in the above embodiment, the mineral oil M is exemplified by the mineral oil, but may be a general insulating oil other than the mineral oil, liquid silicone, or the like. Various changes may be made to the overall configuration of the transformer, including, for example, a circulating pump for forcedly circulating the insulating oil M to the radiator and a fan device for forced cooling. It is possible. The conservator may be of the diaphragm sealing type. Various changes can be made to the configuration of the radiator. In addition, the stationary induction device is not limited to a transformer, and can be applied to, for example, a reactor.

  As described above, the embodiments of the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 11 and 31 are oil-filled transformers (oil-filled stationary induction equipment), 12 is a transformer main body (induction equipment main body), 13 is a main body tank, 14 is a radiator, 15 is a conservator, 17 is a lubrication port, 18 is a breathing pipe, 19 is an upper header, 20 is a lower header, 21 is a heat dissipation panel, 22 is an upper oil pipe, 23 is a lower oil pipe, 25 is a connection pipe, 26 and 36 are Buchholz relays (protection relays), 32 Denotes a first connection pipe (connection pipe), 33 denotes a second connection pipe, 34 denotes a first opening / closing valve, 35 denotes a second opening / closing valve, and M denotes insulating oil.

Claims (4)

A main body tank in which the induction machine main body is housed and filled with insulating oil,
A plurality of heat radiators are disposed between the upper header disposed on the side of the main tank and connected to the upper part of the main tank by an upper oil pipe, and the lower header connected to the lower part of the main tank and the lower oil pipe. A radiator configured to have a panel, and for cooling the insulating oil,
A conservator disposed above the main body tank for absorbing thermal expansion and contraction of the insulating oil,
The upper header of the radiator is located above the top of the main tank, and the conservator is located below the upper header,
An oil-filled stationary induction device in which a bottom of the conservator and a top of the radiator are connected by a connection pipe.   2. The oil-filled stationary induction device according to claim 1, wherein a protective relay is provided at an intermediate portion of the connection pipe, which is located above the radiator. 3. A second connection pipe connecting the upper part of the main body tank and the conservator,
The oil-filled stationary induction device according to claim 1, wherein the connection pipe and the second connection pipe are each provided with an on-off valve.   The oil-filled stationary induction device according to claim 3, wherein a protection relay is provided at an intermediate portion of the second connection pipe.

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