JPH09270339A - Oil-contained electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an oil-contained electric apparatus superior in cooling performance for cooling connection conductors with preventing insulation oils from mixing in two tanks in which the main body of electric apparatus is housed and connection duct and conductors connecting the tanks are provided; the conductors passing through the duct. SOLUTION: A connection duct 25 is partitioned by a partition 30. Tubular barriers 28a, 28b are disposed at both sides of the partition with leaving spaces 28g, 28h for communicating the inside of the barriers with the outside thereof. Shielding barriers 28c are integrated with the partition 30 to electrically shield the spaces 28g, 28h from the duct 25. The partition 30 prevents insulation oils in tanks from mixing. The temp. risen insulation oils due to the Joule's heat of connection conductors 27 meanderingly flow up zigzag among the spaces 28g, 28h, thus providing a superior cooling performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled electric device such as an oil-filled transformer or an oil-filled reactor. More specifically, the present invention relates to an oil-filled electrical device including a connection conductor that passes through a connection duct that connects two tanks in which the oil-filled electrical device body is housed and that connects the electrical device body.

[0002]

2. Description of the Related Art In general, the electric field strength is high in a connecting conductor which passes through and is connected to a connecting duct connecting tanks accommodating oil-filled electric device bodies of high voltage exceeding 500 kV. Therefore, it is not a good idea to secure the insulation distance between the connection conductor and the ground only with the insulating oil, because it is a large-sized device in terms of the size of the device. Therefore, in the connection conductor in the above high-voltage oil-filled electrical equipment, multiple concentric cylindrical barriers are arranged around the connection conductor to withstand high electric field strength and reduce the insulation distance. A composite insulation structure using a barrier insulator having a cylindrical barrier has been adopted.

This is because: 1) Solid insulators such as pressboards used as barriers have a higher dielectric breakdown voltage than insulating oil. 2) As the oil gap size between barriers becomes smaller, the breakdown voltage in the oil gap becomes higher. 3) The reason is that by arranging multiple cylindrical barriers, it is possible to secure the creepage distance at the connecting conductor supporting part, and it is widely adopted mainly from the viewpoint of improving the insulation strength by subdividing the oil gap. There is.

FIG. 12 is a block diagram showing a connecting device having a composite insulating structure in a conventional split type ultra high voltage oil-filled transformer disclosed in, for example, Japanese Patent Publication No. 3-61323.
In the figure, 1 is an oil-filled transformer, and 1a and 1b are divided tanks of the oil-filled transformer 1. The windings 2a and 2b are housed inside the tanks 1a and 1b, and the windings 2a and 2b are connected by a composite insulating connector 3. Although not shown in the figure, an iron core around which windings 2a and 2b are wound is provided in the tanks 1a and 1b. The composite insulating connector 3 has a composite insulating structure composed of a central connecting conductor 3a and a barrier insulator 3c. Further, the barrier insulator 3c has a cylindrical barrier 3b that concentrically surrounds the connecting conductors 3a in multiple layers.

Reference numeral 4 is a connection duct for passing the composite insulated connection body 3 for connecting the tanks 1a and 1b with a flange or the like not shown so that the tanks 1a and 1b of the transformer 1 can be easily disassembled and assembled. It is connected. A bushing 5 serves as a lead-out terminal of the transformer 1. A connecting device 9 is composed of the composite insulated connector 3 and the connecting duct 4.

FIG. 13 shows, for example, Japanese Examined Patent Publication No. 62-25244.
FIG. 5 is a plan layout view of another conventional connection device of a composite insulating structure in a super-high voltage oil-filled electric device of a split type shown in Japanese Patent Publication No. In the figure, reference numerals 1a and 1b denote tanks of a divided oil-immersed transformer similar to those shown in FIG. 12, and the tanks 1a and 1b contain iron cores 6a and 6b and windings 2a and 2b. There is. Reference numeral 7 denotes a U-shaped connecting duct that connects the tanks 1a and 1b when viewed from above, and has a rectangular cylindrical cross section.

Further, near the center of the cross section of the connecting duct 7, there is arranged a composite insulating connector 3 having a composite insulating structure for electrically connecting the windings 2a and 2b. The composite insulating connector 3 is composed of a connecting conductor 3a similar to that shown in FIG. 12 and a barrier insulator 3c having a plurality of cylindrical barriers 3b. The connection conductor 3a electrically connects the lead-out point A of the winding 2a and the lead-out point B of the winding 2b. Similarly, in the conventional device shown in FIG. 13, the connecting device 9 is composed of the composite insulating connector 3 and the connecting duct 4.

The connecting device in the high-voltage oil-filled electrical equipment constructed as described above generally needs to support the barriers 3b and the connecting conductor 3a itself for the following reasons. 1) The connecting distance between the winding 2a in the tank and the winding 2b in another tank is, for example, 4 to 5 m in a transformer of 500 kV class.
And become longer. 2) Since the barrier insulator 3c has a composite insulating structure using multiple barriers 3b, the weight of the entire connecting device 9 is heavy.

Further, regarding the supporting method of the barriers 3b, the doughnut-shaped solid spacers are arranged at predetermined intervals between the multiple cylindrical barriers 3b, and the rectangular solids are arranged in the longitudinal direction. Generally, a plurality of spacers are radially inserted. 14 and 15 are cross-sectional views and a side view showing a conventional composite insulating lead, for example, disclosed in Japanese Patent Publication No. 3-61323, in which donut-shaped solid spacers are arranged at predetermined intervals between cylindrical barriers. It is a figure. In the figure, 8 is a doughnut-shaped spacer for ensuring a space between the barriers 3b, and a plurality of notches 8a are provided in the circumferential direction so that insulating oil can pass in the longitudinal direction of the barrier 3b. ing. In this case, the composite insulating connector 3, the connecting duct 4, and the spacer 8 constitute a connecting device 9.

For example, Japanese Patent Publication No. 53-118733 discloses a support structure in which solid spacers are radially inserted between barriers including connecting leads. That is,
Multiple barriers are arranged around the connection conductor, and square spacers are radially provided between the barriers to secure the space between the barriers. Further, the spacer ensures a cooling oil flow path for cooling the connection conductor between the barriers in the axial direction of the barrier. The conventional one is
It is configured as described above, and the discharge start voltage of the connection conductor 3a is increased so that the winding 2a and the winding 2b can be electrically connected.

[0011]

The conventional oil-filled electrical equipment such as the oil-filled transformer of the split type to which the connecting device having the composite insulation structure is applied is configured as described above, and the insulating oil is applied between the barriers. Since the traffic flows through the cooling flow path, there are the following problems.

A. Since the insulating oil for cooling the connecting conductor 3a flows axially in each barrier 3b, in the tank of one of the transformers, the breakdown such as the breakdown of the insulating oil or the damage to the insulator, In the event of a serious failure that mixes into the insulating oil as foreign matter, the contaminated insulating oil will flow into the tank of another healthy transformer, and the normal insulating oil will be contaminated.

B. Recently, when a problem such as localized heating occurs in oil-filled electrical equipment, a diagnostic technique has been established to diagnose the presence or absence of abnormality by analyzing a specific flammable gas dissolved in insulating oil. ing. However, since the insulating oil that has been contaminated as described above is mixed with normal insulating oil, it is difficult to identify the tank where the combustible gas is generated and the generation site.

C. If it is an AC oil-filled electrical device,
In-oil bushings and resin partition plates can be used, but it is difficult to apply them to DC electrical equipment from the electrical and dimensional viewpoints. d. In the innermost barrier 3b close to the connection conductor 3a, the temperature rise due to heat generation of the connection conductor 3a is particularly large, and sufficient cooling flow passage cannot be secured and cooled.

The present invention has been made in order to solve the above problems, and it is possible to prevent the insulating oil from flowing between a plurality of tanks, so that the insulating oil of other tanks and the generated gas are mixed. It is an object of the present invention to obtain an oil-filled electrical device that can prevent the occurrence of heat, ensure the insulation performance of the connecting conductor, and have excellent cooling performance of the connecting conductor. Another object of the present invention is to provide an oil-filled electrical device that can perform the above functions with a simple configuration, or can moderate the increase in internal pressure when the pressure in the tank rises due to an internal failure or the like and suppress deformation and damage of the tank. And Another object of the present invention is to obtain an oil-filled electric device capable of improving the cooling performance of the connecting conductor by utilizing the chimney effect in the flow of insulating oil.

[0016]

According to a first aspect of the present invention, there is provided an oil-filled electric device, which has an oil-tight connection duct for connecting two tanks respectively accommodating the electric device main body, and is partitioned between the two tanks. Partitioning device to prevent the circulation of insulating oil in
A cylindrical tubular barrier that is concentric with a connecting conductor that penetrates through the partitioning device and connects the windings to each other, and that connects the inside and the outside of the cylindrical barrier on both sides of the partitioning device. And the second communication part and the first and second communication parts are provided on the connection duct side so as not to hinder the flow of insulating oil, and the first and second communication parts are electrically connected to the connection duct. A barrier insulator having first and second shielding barriers for selectively shielding.

In the oil-filled electrical device according to the first aspect of the present invention, the partitioning device prevents the insulating oil from flowing between the two tanks, so that the insulating oils do not mix with each other. Therefore, even if the insulating oil in one tank is contaminated, it is not mixed with the insulating oil in the other tank, and the spread of contamination can be prevented. Further, since the insulating oil near the connection conductor whose temperature has risen due to the Joule heat of the connection conductor flows from the inside of the tubular barrier to the outside through the first and second communication portions, a partitioning device is provided to penetrate the inside of the connection duct. Even if the insulating oil does not flow, the connection conductor has excellent cooling performance. The shielding barrier electrically shields the communication part from the connection duct, and prevents the low voltage performance from being deteriorated by providing the communication part.

According to a second aspect of the present invention, there is provided an oil-filled electrical device in which the tubular barrier and the partitioning device form predetermined axial gaps so that the tubular barrier forms first and second communicating portions with the partitioning device. And a first and a second barrier provided on both sides of the partitioning device, and the first and the second barriers are cylindrical tubular barriers integrally formed. The lever has a cylindrical shielding barrier having a diameter different from those of the first and second barriers, and a radial gap is provided in the radial direction so that the ends overlap with the ends of the first and second barriers, respectively. It is arranged concentrically with the connecting conductor and through the partition device.

In the oil-filled electric device according to the second aspect of the present invention, the insulating oil in the vicinity of the connection conductor whose temperature has risen flows from the inside of the tubular barrier to the outside through the axial gap and the radial gap. The ends of the tubular shielding barrier overlap with the ends of the first and second barriers, respectively, so that the axial gaps are electrically shielded from the connection duct by the tubular shielding barrier. Therefore, the insulation performance is prevented from being deteriorated by providing the axial gap.

According to a third aspect of the present invention, there is provided an oil-filled electric device in which a partitioning device is provided so that insulating oil does not pass through the partitioning device, and annular members formed on both sides of the partitioning member and corrugated in the circumferential direction. A corrugated assembly having corrugated spacers, wherein the corrugated assembly maintains a predetermined radial spacing between the connecting conductor, the tubular barrier, the shielding barrier and the connecting duct, and It is inserted so as to prevent the flow of insulating oil between them.

In the oil-filled electrical device according to the third aspect of the present invention, the corrugated assembly prevents the flow of insulating oil between the two tanks and connects the connection conductor, the tubular barrier, and the shielding barrier. It has the dual function of keeping the radial distance from each of the ducts, and realizes partitioning and keeping the distance with a simple structure. Further, even if the radial distance is made small, the corrugated spacer can secure the creeping insulation distance in the radial direction.

According to a fourth aspect of the present invention, in the oil-filled electric device, the partition device is configured to be movable in the longitudinal direction of the connection conductor together with the connection conductor, and is slidable in the axial direction with the inner circumference of the connection duct. It was made possible. According to the fourth aspect of the present invention, for example, when the internal pressure of one tank increases due to an internal failure, the partition device moves to the side of the other tank having a low pressure to mitigate the increase in the internal pressure of the one tank.

The oil-filled electrical equipment according to a fifth aspect of the present invention is provided with a restoring device for restoring the partition device to the original position.

According to a sixth aspect of the present invention, there is provided an oil-filled electrical device in which circumferential ends are respectively provided at both ends of the tubular shielding barrier and at ends of the first and second barriers overlapping with the tubular shielding barrier. An electric field relaxation means is provided. According to the sixth aspect of the present invention, the electric field relaxing means increases the contact area of the barrier end with the insulating oil, and the equipotential from the barrier end which is a solid insulator to the insulating oil which is a liquid insulator. The line becomes gentle, partial discharge is suppressed, and the insulation strength at the end of each barrier is increased.

In the oil-filled electric device according to the seventh aspect of the present invention, the first and second communicating portions of the barrier insulator are through holes provided in the tubular barrier. According to the seventh aspect of the present invention, the insulating oil in the vicinity of the connection conductor whose temperature has risen flows from the inside of the cylindrical barrier to the outside through the through hole. Since the through hole serves as a communicating portion and the tubular barrier also serves as a shielding barrier, the structure is simplified.

In the oil-filled electrical device according to the eighth aspect of the present invention, the first and second communicating portions communicate with the outer peripheral portion of the connecting conductor and the inner peripheral portion of the connecting duct. The position where the connecting duct and the tank are connected is made higher than the position where the connecting conductor is connected to the winding in the tank, and the tubular barrier extends to the vicinity of the position where the connecting conductor is connected to the winding. According to the eighth aspect of the present invention, the insulating oil in the vicinity of the connection conductor, the temperature of which has risen due to the Joule heat of the connection conductor, passes through the first and second communication portions to reach the upper inner peripheral portion of the connection duct, Reflux to. Along with this reflux, insulating oil having a low temperature at the position where the connecting conductor is connected flows into the tubular duct. Since the position where the connection duct and the tank are connected is higher than the position where the connection conductor is connected to the winding, the temperature difference of the insulating oil at both positions is large, and the stack effect occurs.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment of the Invention 1 to 6 show a plurality of divided oil-filled electrical equipment according to an embodiment of the present invention, and FIG. 1 is a sectional view conceptually showing a connection state of the oil-filled electrical equipment, FIG. 2 is a sectional view showing the main part of the connecting device. FIG. 3 is a perspective sectional view showing a main part of the connection device, and FIG. 4 is a partially enlarged view of the partition device. FIG. 5 is a perspective view showing the flexible portion of the connecting conductor, and FIG. 6 is an explanatory view showing the flow of insulating oil in the vicinity of the partition device. In this embodiment, the oil-filled electric device is a high-voltage DC reactor of 500 [kV], and is divided into four tanks for storage due to transportation restrictions.

In FIG. 1, 21a to 21d are divided DC reactor tanks. Tanks 21a-21
Magnetic shields 22a to 22d and windings 23a to 23d, each of which is configured in two parallel lines, are housed in d, and insulating oil is filled therein. Reference numeral 24 is a connection device, which is configured as follows. Reference numeral 25 denotes a connection duct, which is composed of tank-side duct portions 25a and 25b and a central duct 25c. The central duct 25c is disposed between the tank-side duct portions 25a and 25b, and the flange 25 is provided at both ends thereof.
d (FIG. 2). The connection duct 25 is provided between each of the plurality of tanks 21a to 21d.

Reference numeral 26 denotes a composite insulating lead, which is a connecting conductor 2.
7 and a barrier insulator 28. The connection conductor 27 includes conductors 27a and 27 connected to the windings 23a to 23d.
b, a central conductor 27c, and a flexible conductor 27d. Flexible conductors 27d are provided on both the left and right sides of the central conductor 27c in FIG. 2, and connect the central conductor 27c to the left and right conductors 27a and 27b. The flexible conductor 27d is formed by stacking a plurality of thin plate conductors, for example, as shown in the perspective view of FIG. 5, and connects the conductors 27a and 27b to the central conductor 27c in a bent state. The flexible conductor 27d enables a central conductor 27c, which is integrated with a partition device 30 described later, to move in the longitudinal direction thereof.

The barrier insulator 28 is composed of conductors 27a and 27a.
b, cylindrical barriers 28a and 28b, which are cylindrical barriers made of pressboard, which are concentrically arranged with respect to the central conductor 27c, respectively, cylindrical barriers 28c which are cylindrical barriers, and each barrier. 28a, 28b, and 28c have electric field relaxation means 28d, 28e, and 28f made of an insulating material and formed of an insulating material in a circular ring shape.

As shown in FIG. 2, the barriers 28a and 28b have the same diameter, and an axial gap is provided on both sides of a corrugated assembly 31, which is a partitioning device described later, with respect to the corrugated assembly 31 described later. The axial gap of the lever is arranged so as to form the communication portions 28g and 28h. The communication portions 28g and 28h communicate the inside and outside of the barriers 28a and 28b. In this embodiment, the communication portions 28g and 28h communicate from the inside of the innermost barrier 28c to the outside of the outermost barrier 28c.

The barrier 28c has a diameter different from that of the barriers 28a and 28b, and is alternately overlapped with the barriers 28a and 28b. The communicating portions 28g and 28h serving as the first and second communicating portions are set to the ground potential. A certain central duct 2
5c is electrically shielded. Communication part 28g, 2
This is for preventing the insulation strength of the connecting conductor from being reduced by 8 h. The axial lengths of the central conductor 27c and the barrier 28c are substantially the same as the central duct 25c. Composite insulating lead 26 configured as described above
Passes through the connecting duct 25 and the windings 23a to 23d
Are connected in series.

The partition device 30 is composed of a plurality of corrugated assemblies 31. The corrugated assembly 31 is composed of a partition plate 32 as a partition member and a corrugated spacer 33. As shown in FIG. 3, the corrugated spacers 33 are formed by pressing a corrugated pressboard into an annular shape, and are fixed to the left and right sides of the partition plate 32 with an adhesive so that no radial gap is generated. . Partition plate 32
In this embodiment, is formed into a hollow disk shape with a press board.

The corrugated assembly 31 as described above is fitted between the barriers 28c and between the outermost barrier 28c and the central duct 25c in the substantially central portion of the central duct 25c as shown in FIG. . Central conductor 27
c and the innermost corrugated assembly 31, and each corrugated assembly 31 and each barrier 28c are fixed to each other with an adhesive agent so as to have oil tightness. Furthermore, the outermost corrugated assembly 31 and the inner circumference of the central duct 25c are
For example, the structure is in contact with a sealing means (not shown) such as an O-ring and is slidable in the longitudinal direction of the central conductor 27c.

In FIG. 2, the portion of the spacer 33 in the vicinity of the barrier 28c, which is painted black, is the cross-sectional portion of the corrugated spacer 33 on the cutting line of the cross section.
The partition device 30 is configured as described above and includes the central duct 2
Between tanks within 5c (for example, tanks 21a, 21b
The insulation oil is blocked from flowing.

Reference numeral 34 is a restoring device, which is a stopper 34a and a bellows spring 34b formed in a bellows shape as shown in FIG.
It is composed of The stopper 34a is the central duct 25.
The bellows-shaped spring 34b is fixed to the inner peripheral portion of c, and is inserted between the corrugated spacer 33 of the outermost layer and the stopper 34a so as to sandwich and press the end portion of the corrugated spacer 33 to the left and right in the drawing. The restoring device 34 is for restoring the position of the partitioning device 30 fixed to the central conductor 27c when the partitioning device 30 moves in the axial direction together with the central conductor 27c, and the reaction force of the bellows spring 34b is supported by the stopper 34a. To be done. The stopper 34a and the bellows-shaped spring 34b are made of an insulating material in order to avoid the electric field concentration phenomenon.

The central duct 25c and the central conductor 27
c, a shielding barrier 28c provided concentrically with the central conductor 27c, a partitioning device 30, and a restoring device 34 are unitized. The connecting device 24 includes the connecting duct 25, the composite insulating lead 26 (the connecting conductor 27, the barrier insulator 28), the partitioning device 30, and the restoring device 34 described above. Reference numeral 35 (FIG. 1) is a bushing that serves as a lead terminal from the windings 23a and 23d.

The corrugated spacer 33 is shown in FIG. 4 of Japanese Utility Model Application Laid-Open No. 58-114024 and in the technical magazine Mitsubishi Electric Technical Report Vol. 69, no. 10, 1995 1st
It is similar to that shown in FIG. 5 on page 6 and is formed in a corrugated shape with a press board which is an insulating paper, and has the following features. 1) Flexible in radial dimension and high support strength. 2) It should be lighter in weight than solid spacers. 3) A structure with high insulation strength can be obtained by combining with a plate-shaped insulating material. 4) The gap between the corrugated corrugations serves as a flow path for insulating oil for cooling. Due to such advantages, it is usually used for the high voltage connecting device as described above.

Next, the flow of insulating oil in the vicinity of the partition device 30 will be described with reference to FIG. Since a current flows through the connection conductor 27 (conductors 27a, 27b, 27c), it is necessary to cool the Joule heat generated by insulating oil.
In the embodiment of the present invention, the communication portions 28g and 28h as described above are provided. Therefore, the insulating oil in the vicinity of the connecting conductor 27 whose temperature has risen becomes flows C and D shown by the dotted lines in FIG. 6 while being blocked by the barrier 28c.
Passes g and 28h in zigzag, and moves upward.

Along with the movement of the insulating oil, insulating oil having a low temperature flows from the inlets of the barriers 28a and 28b of the winding lead-out portions as indicated by arrows E and F, and the conductors 27a, 27b and 27 are formed.
A circulation channel for cooling of c is formed. The insulating oil whose temperature has risen due to the Joule heat generated in the connecting conductor 27 is transmitted axially to the left or right above the inner peripheral portion of the connecting duct 25, respectively.
Return to b).

In the embodiment of the present invention, as described above, the partitioning device 30 is provided on the composite insulating lead 26 in which the cylindrical barriers 28a, 28b, 28c are concentrically arranged with the conductors 27a, 27b and the central conductor 27c. Provided. The partitioning device 30 prevents mixing of the insulating oil in each of the tanks 21a to 21d, and prevents the insulating oil contaminated due to an internal failure of the electric device main body housed in the tank from flowing into a healthy tank side. . Therefore, in the abnormality diagnosis technology that analyzes the combustible gas mixed in the insulating oil to diagnose the presence or absence of an abnormality and the location of the abnormality, it becomes easy to identify the tank in which the abnormality has occurred and the location of the abnormality.

The diameters of the barriers 28a and 28b on the winding side and the diameter of the barrier 28c for shielding are different from each other so that the barriers are overlapped with each other, and a communicating portion is provided between the barriers 28a and 28b and the corrugated assembly 31. 28g and 28h were provided.
Therefore, the insulating oil in the vicinity of the connecting conductor 27 is not connected to the communicating portion 28.
It becomes possible to flow upward through g and 28h,
A circulation passage for cooling is formed by the communication portion and the barrier inlet of the winding portion of the winding, so that the conductor can be cooled efficiently.

The barriers 28a, 28b and 28c are formed at the ends thereof with a circular rod in an annular shape.
e, 28f are provided. Therefore, the contact area of the barrier end with the insulating oil increases, the equipotential lines from the barrier that is a solid insulator to the insulating oil that is a liquid insulator become gentle, partial discharge is suppressed, and the barriers 28a, 28b, 28c are suppressed. It is possible to maintain high insulation strength at the ends of the.

The electric field relaxation means 28d, 28e, 28
In f, a solid round bar of an insulating material is provided at the tip of the barrier, but the barriers 28a, 28b, 28c themselves may be rounded or curled to have the same electric field relaxing effect. Providing the electric field mitigating means 28d, 28e, 28f is an important factor for improving the quality, especially in the oil-filled electrical equipment for direct current as shown in the embodiment of the present invention.

Further, in the partition device 30, the outermost corrugated spacer 33 and the inner circumference of the central duct 25c are in contact with each other,
Moreover, it is slidable in the longitudinal direction of the connection conductor. Therefore, when the internal pressure of the tank 21a or the tank 21b suddenly rises due to a ground fault of the windings 23a, 23b, etc., the partition device 30 causes the central duct 25 to operate.
The pressure in the tank c is moved to a tank having a low pressure and the generated pressure is propagated to the adjacent tank to prevent deformation and damage of the failed tank. When the partition device 30 moves, the flexible conductor 27d bends to facilitate the movement.

Further, since the restoring device 34 for restoring the partitioning device 30 to the original position is provided, when the supporting portion moves due to the above pressure fluctuation, the restoring force of the restoring device 34 can restore the original position. In addition, the central duct 25c, the central conductor 27c,
Since the shielding barrier 28c, the partitioning device 30, and the restoring device 34, which are provided concentrically with the central conductor 27c, are unitized, they can be easily assembled and transported.

Second Embodiment of the Invention FIG. 7 is a cross-sectional view of a main part showing a main part of another embodiment of the present invention. In the figure, reference numeral 40 denotes a partitioning device, which is composed of three corrugated assemblies 41 which are interposed between the barriers 28c and between the barrier 28c and the central duct 25c. Further, the corrugated assembly 41 is composed of a partition member 42 and a corrugated spacer 43.

In the partition member 42, the horizontal portions 42c of a plurality of annular members 42a formed so as to form an annular groove 42b having a U-shaped cross section are fitted to each other as shown in the drawing,
The horizontal portions 42c are formed by adhering each other in an oil-tight manner with an adhesive. A corrugated spacer 43, which is constructed similarly to that shown in FIG. 3 and has a slightly longer length, is inserted into the annular groove 42b of the partition member 42 so as to project, as shown in FIG. Is glued to. The corrugated spacer 43 projects from the annular groove 42b in order to increase the creepage insulation distance in the radial direction.

The innermost corrugated assembly 41 and the central conductor 27c are oil-tightly bonded. The outermost corrugated assembly 41 and the inner circumference of the central duct 25c are in contact with each other via a sealing means such as an O-ring (not shown), and have a structure slidable in the length direction of the conductor 27. ing.
Since other configurations are the same as those shown in FIG. 2, corresponding components are designated by the same reference numerals and description thereof is omitted.
Further, the restoration device 34 (not shown) and other components are the same as those shown in FIG. However, the barriers 28a and 28b have a two-layer structure.

As described above, the partition device 40 is provided on the composite insulating lead 26, and the central duct 25c is installed by the partition device 40.
The insulating oil is prevented from flowing in the axial direction in the inside, and the insulating oil between the divided tanks is prevented from being mixed as in the first embodiment of the invention.

Third Embodiment of the Invention FIG. 8 is a cross-sectional view of an essential part showing an essential part of another embodiment of the present invention.
In the figure, 50 is a partitioning device, and three corrugated assemblies 51 are interposed between the central conductor 27c and the innermost barrier 28c, between each barrier 28c, and between the outermost barrier 28c and the central duct 25c. It is composed by. Further, the corrugated assembly 51 is composed of a partition member 52 and a corrugated spacer 53.

The partition member 52 has two annular members 5 formed so as to form an annular groove 52b having a U-shaped cross section.
2a are placed back to back and their horizontal portions 52c are stacked in two or three stages with a cylindrical insertion insulating tube 54 interposed therebetween as shown in the drawing.
These are formed by oil-tightly adhering each other with an adhesive. A corrugated spacer 53 similar to that shown in FIG. 7 is inserted into the annular groove 52b of the partition member 52 and is partially bonded.

The innermost corrugated assembly 51 and the central conductor 27c are oil-tightly bonded. The outermost corrugated assembly 51 and the inner circumference of the central duct 25c are in contact with each other via a sealing means such as an O-ring (not shown), and have a structure capable of sliding in the length direction of the conductor 27. ing.
Since other configurations are similar to those of the first embodiment of the present invention shown in FIG. 2, corresponding parts are designated by the same reference numerals and description thereof will be omitted. As described above, the composite insulation lead 26
A partitioning device 50 is provided in the above, and the partitioning device 50 blocks the flow of the insulating oil to prevent mixing of the insulating oil between the divided tanks as in the partitioning device 30 shown in FIG.

Since the other structure is the same as that shown in FIG. 2, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted. Further, the restoration device 34 (not shown) and other components are the same as those shown in FIG. However, the barriers 28a and 28b have a two-layer structure. The barriers 28a, 28b, 28c are not limited to the cylindrical shape, and may be a cylindrical shape such as a square shape.

Fourth Embodiment of the Invention FIG. 9 is a sectional view of the essential parts showing the essential parts of another embodiment of the present invention.
In the figure, reference numeral 60 is a connecting device, which is configured as follows. 61 is a composite insulated lead, and is a connecting conductor 62.
And a barrier insulator 63. The composite insulation lead 61 is
The tank 21a is similar to the composite insulation lead 26 in FIG.
The windings 23a to 23d housed in the coils 21a to 21d are electrically connected to each other.

The barrier insulator 63 is composed of a plurality of cylindrical barriers 64 which are concentrically arranged with the connecting conductor 62 and are multiply arranged.
To 67. A shielding barrier 67 having a predetermined length is provided outside the outermost barrier 66 of the long barriers. The through holes 64a to 66a and the through holes 64b to 66 are displaced above the respective barriers 64 to 66 in the axial direction.
b is provided as shown.

That is, through the through holes 64a to 66a and the through holes 64b to 66b, the first and second flow paths 68 of insulating oil which communicate in a stepwise manner in the radial direction from the inside of the inner barrier 64 to the outside of the barrier 66. , 69 are formed. The barriers 65, 66 and 67 electrically shield the through holes 64a to 66a and the through holes 64b to 66b with respect to the connection duct 25 which is at the ground potential, thereby ensuring the insulation strength of the insulated conductor. The through holes 64a to 66a and the through holes 64b to 6
6b is the first and second communication parts in the present invention,
The barrier 67 is a shielding barrier, and the barriers 65 to 66 serve both as a tubular barrier and a shielding barrier.

Reference numeral 70 denotes a partition device, which is the central duct 25c.
Of the connecting conductor 62 and the barrier 6 at approximately the central portion in the axial direction of
4, a plurality of, in this example, five partition insulating plates 71 interposed between the barriers 64 to 67 and between the barrier 67 and the central duct 25c. Partition insulation board 71
Is a hollow disk-shaped one having an annular deep groove provided on the surface (the groove is not shown), and the inner and outer peripheral portions thereof are the connection conductor 62, the barriers 64 to 67, respectively. Also, it is oil-tightly bonded to the central duct 25c with an adhesive material (not shown).

In the connecting device 60 having the above-described structure, the insulating oil in the innermost layer of the barrier 64 whose temperature is raised by the Joule heat generated in the connecting conductor 62 flows through the flow paths 68 and 69 as shown by the alternate long and short dash line in FIG. It flows as shown by arrows G and H.
Further, it returns to the inside of the tank (for example, the tanks 21a and 21b) along the upper side of the inner peripheral portion of the connection duct 25. As described above, the partitioning device 70 is provided on the composite insulating lead 61 to prevent the flow of the insulating oil between the tanks, and the insulating oil between the divided tanks is mixed in the same manner as the partitioning device 30 shown in FIG. To prevent. Further, since the through holes 64a to 66a and the through holes 64b to 66b are used as the first and second communication portions, and the barriers 65 to 66 serve both as a cylindrical barrier and a shielding barrier, the structure is simplified.

In the embodiment shown in FIG. 9,
The same effect can be obtained even with the following configuration. That is,
The innermost partition insulating plate 71 and the connection conductor 62 are oil-tightly bonded and fixed with an adhesive, and an O-ring is inserted between the barrier 64 and the barrier 64 for sealing. Similarly, the inner peripheral portion of the partition insulating plate 71 is oil-tightly adhered and fixed to the inner barrier so that the outer peripheral portion of the partition insulating plate 71 and the outer barrier and the outermost partition insulating plate 71 are separated.
An O-ring is inserted between the central duct 25c and the central duct 25c for sealing.

Further, in FIG. 9, the outermost barrier 67 is provided.
Shows a cylindrical shape, but may have another shape having a function of electrically shielding the through hole 66a or 66b from the connection duct 25, for example, an arc shape. It is not always necessary to provide all of the barriers 64 to 66, and depending on the current flowing through the connection conductor 62, for example, when the current is small, only the barrier 64 may have through holes 64a,
64b may be provided. Further, through holes 64a to 66a
Also, the through holes 64b to 66b are shown to communicate with the inside of the inner barrier 64 from the inside of the barrier 66 to the outside of the barrier 66 in a stepwise manner in the radial direction, but there is no limitation to the stepwise shape, and for example, a communication path communicating in a zigzag manner. May be

Fifth Embodiment of the Invention FIG. 10 and FIG.
FIG. 10 shows another embodiment of the present invention.
Is a cross-sectional view showing the connection device, and FIG. 11 is a cross-sectional view conceptually showing a connection state of the connection device. In these figures,
Reference numeral 84 is a connecting device, and as shown in FIG.
It is arranged in the upper part of a to 21d. Connection device 84
Has a connecting duct 25 and a composite insulating lead 86.

The composite insulation lead 86 passes through the connection duct 25 and connects the windings 23a to 23d to the connection points J, K and J.
2 and K2 are connected in series. Connection duct 25
Is provided at a position higher than the connection points J, K and J2, K2. Further, the composite insulating lead 86 is connected to the connecting conductor 8
7 and a barrier insulator 88. Barrier insulator 88
Are cylindrical barriers 88a, 88b, 28c arranged concentrically with the connecting conductor 87, and the barriers 88.
Although not shown in the drawings at the end portions of a, 88b, 28c, electric field relaxation means similar to the electric field relaxation means 28d, 28e, 28f of the solid round bar shown in FIG. Have

The barriers 88a and 88b are arranged with a predetermined gap in the axial direction with the partitioning device 30 so as to form the communicating portions 28g and 28h on both sides of the partitioning device 30. The barriers 88a and 88b are connection points J, K and J shown in FIG.
2, extended to near K2. Although details of one of the connecting conductors 87 are not shown in the figure, a tank (for example, 21
In c), it is branched and connected to the connection point J and the connection point J2, and the other connection conductor 87 is branched in (for example, 21d) and connected to the connection point K and the connection point K2. The barrier 88a and the barrier 88b have the same diameter, and have a different diameter from the barrier 28c. Further, the barriers 88a and 88b are arranged to overlap the barrier 28c in the axial direction thereof.

In this way, the barrier insulator 88 is
The barriers 88a and 88b having different diameters and the barrier 28c are overlapped with each other, and the communicating portion 28 is provided by the barrier 28c for shielding.
g and 28h are shielded from the connection duct. Other configurations, including those not shown, are the same as those of the embodiment shown in FIG. 2, and the same components as those shown in the figure are designated by the same reference numerals and the description thereof will be omitted.

Composite insulating lead 8 constructed as described above
6, the position of the connection duct 25, as shown in FIG.
Drawing position with respect to the windings 23a to 23d (connection position (J,
Since it is arranged higher than K point or J2, K2 point, the temperature difference of the insulating oil between the communicating portions 28g, 28h and the above-mentioned drawing position becomes large, and the difference in specific gravity due to this temperature difference causes the stack effect. The circulation of the insulating oil flowing in the directions of the arrows M, N, P, and Q in FIG. 10 that flow from the vicinity of the drawing position and pass through the communication portions 28g and 28h is promoted, and the cooling performance of the connection conductor is further improved.

[0067]

As described above, according to the oil-filled electric device according to the first aspect of the present invention, the oil-tight connection duct for connecting the two tanks respectively accommodating the electric device bodies is partitioned. A partition device that blocks the flow of insulating oil between the two tanks, and a tubular barrier and a partition that are concentric with the connecting conductor that penetrates the partition device and connects between the windings and that is arranged in the connection duct. First and second communication portions that communicate the inside and outside of the tubular barrier on both sides of the device and the first and second communication portions, respectively.
First and second shielding barriers that are provided on the connection duct side of the communication portion so as not to hinder the flow of insulating oil and electrically shield the first and second communication portions from the connection duct. Since the barrier insulator having the and is provided, the partitioning device prevents mixing of the insulating oil in the tank, and even if the insulating oil in one tank is contaminated, the insulating oil in the other tank may be contaminated. There is no. In addition, when analyzing the gas present in the insulating oil to diagnose the presence or absence of an abnormality, it is easy to identify the tank in which the abnormality has occurred and the abnormal portion. The insulating oil in the vicinity of the connection conductor, the temperature of which has risen due to the Joule heat of the connection conductor, flows from the inside of the tubular barrier to the outside through the first and second communicating portions, so that the connection conductor has excellent cooling performance. Since the communication part is electrically shielded from the connection duct by the shielding barrier, sufficient insulation performance can be secured.

According to the oil-filled electric device of the second aspect of the present invention, the cylindrical barrier is provided between the first and second cylindrical barriers.
And first and second barriers arranged on both sides of the partition device with a predetermined axial gap between the partition device and the partition device so as to form a communicating portion of the first and second shielding devices. A cylindrical tubular barrier having an integrally formed barrier, the tubular barrier having a diameter different from those of the first and second barriers, and the end portions of the barrier having the first and second barriers, respectively. Since the connecting conductor is arranged concentrically and through the partition device so as to overlap the end portions and with a radial gap in the radial direction, the insulating oil in the vicinity of the connecting conductor whose temperature has risen is It flows from the inside to the outside of the tubular barrier through the directional gap and the radial gap, and is excellent in cooling performance of the connecting conductor. Further, the ends of the tubular shielding barrier overlap with the ends of the first and second barriers in the radial direction, respectively, and the first and second communication portions are electrically connected to the connection duct by the tubular shielding barrier. Since it is shielded, the sufficient insulation performance can be secured.

According to the oil-filled electric device of the third aspect of the present invention, the partitioning device is provided with a partitioning member for preventing insulating oil from passing through and the partitioning device is provided on both sides of the partitioning member and is formed in a corrugated shape in the circumferential direction. A corrugated assembly having an annular corrugated spacer, the corrugated assembly maintaining a predetermined radial spacing between the connecting conductor, the tubular barrier, the shielding barrier, and the connecting duct. Since the corrugated assembly is inserted so as to prevent the flow of the insulating oil between the two tanks, the corrugated assembly prevents the flow of the insulating oil between the two tanks, and the connecting conductor, the tubular barrier, and the shielding barrier. It has both the functions of keeping the radial distance between each of them and the connecting duct, and can realize partitioning and keeping the distance with a simple configuration. In addition, since the corrugated spacers can reduce the radial distance while ensuring the insulation strength, the device can be downsized.

According to the oil-filled electrical device of the fourth aspect of the present invention, the partition device is configured to be movable together with the connecting conductor in the longitudinal direction of the connecting conductor, and is slidable in the axial direction with the inner circumference of the connecting duct. Because it was made to move,
Even if the internal pressure of one tank rises for some reason, the partitioning device moves to the side of the other tank where the pressure is low, so that the internal pressure rise of one tank is moderated and deformation and damage can be suppressed.

According to the fifth aspect of the present invention, the oil-filled electrical equipment is provided with the restoring device for restoring the partitioning device to the original position. Therefore, the partitioning device moves due to the pressure difference between the two tanks. In this case, the restoration device can restore the original position.

According to the oil-filled electrical device of the sixth aspect of the present invention, both ends of the tubular shielding barrier and the ends of the first and second barriers overlapping with the tubular shielding barrier are circumferentially arranged, respectively. Since the electric field alleviating means is provided in the above, the electric field alleviating means alleviates the electric field concentration at the end of each barrier, and the insulation reliability is improved.

According to the oil-filled electrical device of the seventh aspect of the present invention, the first and second communicating portions of the barrier insulator are through holes provided in the tubular barrier. Since the shaped barrier also serves as a shielding barrier, the structure is simplified.

According to the oil-filled electrical device of the eighth aspect of the present invention, the first and second communicating portions communicate with the outer peripheral portion of the connecting conductor and the inner peripheral portion of the connecting duct. The position where the connecting duct and the tank are connected is made higher than the position where the connecting conductor is connected to the winding in the tank, and the tubular barrier extends to the vicinity of the position where the connecting conductor is connected to the winding. Since the position where the connecting duct and the tank are connected is higher than the position where the connecting conductor is connected to the winding, the temperature difference of the insulating oil at both positions is large, a chimney effect is generated, and the circulation of the insulating oil is promoted. The cooling performance of the conductor is improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a sectional view conceptually showing a connected state of an oil-filled electrical device.

FIG. 2 is a sectional view showing a main part of the connection device in FIG.

3 is a perspective view showing a main part of the connection device in FIG. 1. FIG.

FIG. 4 is a partially enlarged view of the partition device in FIG.

5 is a perspective view showing a flexible portion of the connection conductor in FIG.

FIG. 6 is an explanatory diagram showing a flow of insulating oil in the vicinity of the partition device in FIG.

FIG. 7 is a cross-sectional view of a main part showing a main part of another embodiment of the present invention.

FIG. 8 is a cross-sectional view of an essential part showing an essential part of another embodiment of the present invention.

FIG. 9 is a cross-sectional view of an essential part showing an essential part of another embodiment of the present invention.

FIG. 10 is a sectional view of a connection device showing another embodiment of the present invention.

11 is a sectional view conceptually showing a connection state of the connection device in FIG.

FIG. 12 is a configuration diagram showing a connection device in a conventional split type ultrahigh voltage oil-filled transformer.

FIG. 13 is a plan layout view showing a connection device in another conventional split type ultra high voltage oil-filled electrical device.

FIG. 14 is a sectional view showing a conventional composite insulated lead.

15 is a side view of the conventional composite insulated lead shown in FIG.

[Explanation of symbols]

 21a-21d: Tank 23a-23d: Winding 24: Connection device 25: Connection duct 25c: Central duct 26: Composite insulating lead 27: Connection conductors 27a, 27b, 27c: Conductor, central conductor 28: Barrier insulators 28a, 28b , 28c: Barriers 28d, 28e, 28f: Electric field relaxing means 28g, 28h: Communication part 30: Partition device 31: Corrugated assembly 32: Partition plate 33: Corrugated spacer 34: Restoration device 40: Partition device 41: Corrugated assembly 42: Partition member 43: Corrugated spacer 50: Partition device 51: Corrugated assembly 52: Partition member 53: Corrugated spacer 61: Composite insulating lead 62: Connection conductor 63: Barrier insulator 64-67: Barrier 64a-66a: Through holes 64b to 66b: Through holes 68, 6 : Passage 70: partition 71: partition insulating plate 86: composite insulated lead 87: connection conductor 88: barrier insulators 88a, 88b: barrier

Claims (8)

[Claims] 1. Two tanks each containing an electric device body having a winding and containing insulating oil, an oil-tight connecting duct for connecting the two tanks, and the connecting duct for partitioning A partitioning device that blocks the flow of insulating oil between the two tanks, a connection conductor that passes through the partitioning device and passes through the partitioning device to connect between the windings, and the connection duct that is concentric with the connection conductor. The first and second communication portions that communicate with each other so that the insulating oil can flow between the inside and the outside of the tubular barrier on both sides of the tubular barrier disposed inside and the partition device. And a second communication part that is located closer to the connection duct than the second communication part so as not to hinder the flow of the insulating oil, and electrically shields the first and second communication parts from the connection duct. A first and a second shielding barrier An oil-filled electric device comprising: 2. The barrier insulator is provided with a predetermined axial gap between the partition device and the partition device such that the tubular barrier forms first and second communicating portions with the partition device. The first and second barriers are provided on both sides of the partition device so as to form the first and second communication parts, and the first and second shielding barriers are integrally formed. A tubular shielding barrier having a diameter different from those of the first and second barriers, and end portions thereof overlap with the respective end portions of the first and second barriers. The oil-filled electric machine according to claim 1, wherein the oil-filled electric machine is arranged concentrically with the connection conductor and through the partitioning device with a radial gap provided therebetween. 3. A partitioning device is a corrugated assembly comprising a partitioning member for preventing insulating oil from passing and annular corrugated spacers formed on both sides of the partitioning member and corrugated in a circumferential direction. , So that the corrugated assembly maintains a predetermined radial distance between the connecting conductor, the tubular barrier, the shielding barrier, and the connecting duct, and prevents the flow of insulating oil between the two tanks. The oil-filled electrical device according to claim 2, which is inserted. 4. The partition device is configured to be movable in the longitudinal direction of the connection conductor together with the connection conductor and to be slidable in the axial direction with the inner circumference of the connection duct. The oil-filled electric device according to claim 3. 5. The oil-filled electrical device according to claim 4, further comprising a restoring device for restoring the partition device to the original position. 6. An electric field mitigating means is provided at both ends of the tubular shielding barrier and at ends of the first and second barriers overlapping with the tubular shielding barrier, respectively. Item 2. The oil-filled electrical device according to Item 2. 7. The oil-filled electrical device according to claim 1, wherein the first and second communicating portions of the barrier insulator are through holes provided in the tubular barrier. 8. The first and second communicating portions are adapted to communicate the outer peripheral portion of the connecting conductor with the inner peripheral portion of the connecting duct, and the position where the connecting duct and the tank are connected is within the tank. 2. The oil-filled electricity according to claim 1, wherein the cylindrical barrier is made higher than the position at which the connection conductor is connected to the winding, and the cylindrical barrier extends to the vicinity of the position at which the connection conductor is connected to the winding. machine.