JP2013030683A - Bushing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bushing the fracture or damage of which is prevented more effectively for earthquake shaking, and which does not vibrate for a force acting externally during normal use.SOLUTION: A bushing 1 interposed between a transmission line 2 and an electrical apparatus 3 while having a conductor internally includes a long transmission line side coating 10 covering the transmission line side of the conductor, a long electrical apparatus side coating 20 covering the electrical apparatus side of the conductor, a flexible part 30 interposed between the transmission line side coating 10 and the electrical apparatus side coating 20, and a coupling part 40 interposed between the transmission line side coating 10 and the electrical apparatus side coating 20 and breaking for a force of a predetermined magnitude acting from the electrical apparatus side coating 20 in a direction orthogonal to the longitudinal direction of the transmission line side coating 10, while coupling the transmission line side coating 10 and the electrical apparatus side coating 20 integrally.

Description

  The present invention relates to a bushing, and more particularly, to a bushing having a conductor inside and interposed between a power transmission line and an electric device.

  Conventionally, bushings are used for electrical devices such as transformers and circuit breakers for the purpose of connecting power transmission lines and electrical devices. The bushing is formed with a predetermined length so as to secure a distance between the power transmission line and the package (exterior) of the electric device and to keep the package insulated from the power transmission line. For example, when connecting a power transmission line to which a high voltage of 200,000 V to 500,000 V is applied to an electrical device, a bushing having a length of 5 to 6 m is used. The bushing is stood in the bushing pocket of the package to secure a distance between the power transmission line and the package.

  Here, a material made of porcelain that is heavy and has a low viscosity is used for the bushing. For this reason, if a force acts in a direction perpendicular to the length direction of the bushing due to an earthquake, the bushing is stressed and the bushing may be broken or damaged. When the bushing breaks or breaks down, it is necessary to prepare a new bushing to restore the electrical equipment. However, since it takes time to newly manufacture a porcelain bushing, it also takes time to restore electrical equipment. In addition, when the bushing is broken or broken, the insulating gas or insulating oil filled in the bushing may leak into the environment.

  Therefore, a bushing with improved earthquake resistance by providing a cylindrical bellows at the base is known (for example, see Patent Document 1). In this bushing, the response acceleration of the soot tube is reduced by reducing the natural frequency of the bushing by a bellows and a spring provided therein. This prevents breakage or breakage of the bushing and prevents leakage of insulating gas or insulating oil.

JP-A-5-47569

  By the way, in the bushing in patent document 1, since the bellows was provided in the base end part, the vibration by an earthquake etc., ie, the amplitude became large in the front-end | tip of a bushing. In order to allow this amplitude and prevent breakage or breakage of the pipe, it is necessary to make a margin between the tip of the bushing and the transmission line. In order to prevent breakage or breakage of the bushing more effectively, it is necessary to suppress the response acceleration acting on the porcelain porcelain tube while suppressing the amplitude of the entire bushing.

  In normal use, it is preferable to prevent vibration or deformation of the bushing against a force acting from the outside. For example, it is preferable to prevent the bushing from vibrating in accordance with the tension of the power transmission line during construction on the power transmission line side.

  In view of such circumstances, the present invention provides a bushing that prevents breakage or breakage of the bushing more effectively against shaking such as an earthquake and that does not vibrate or deform against a force acting from the outside in normal use. The task is to do.

  A bushing according to the present invention is a bushing that has a conductor inside and is interposed between a power transmission line and an electrical device, and has a long transmission line side covering portion that covers the power transmission line side of the conductor; A long electric device side covering portion covering the electric device side of the conductor, and interposed between the power line side covering portion and the electric device side covering portion, and the power line side with respect to the electric device side covering portion It is interposed between the flexible part that connects the transmission line side covering part and the electric equipment side covering part so that the covering part is flexible, and between the transmission line side covering part and the electric equipment side covering part. Breaks against a force of a predetermined magnitude that acts in a direction perpendicular to the longitudinal direction of the transmission line side covering portion from the electric device side covering portion while integrally connecting the electric wire side covering portion and the electric device side covering portion. A connecting portion.

  According to such a configuration, the power transmission line side covering portion and the electric equipment side covering portion are connected by the flexible portion between the power transmission line side covering portion and the electric equipment side covering portion, and the power transmission line side The covering portion and the electric equipment side covering portion are integrally connected by a connecting portion between the transmission line side covering portion and the electric equipment side covering portion. Therefore, in normal use, the power transmission line side covering part and the electric equipment side covering part do not vibrate due to externally acting force, that is, the bushing as a whole does not vibrate. In addition, since the connecting portion does not break until a predetermined amount of force is applied, the transmission line side covering portion and the electric equipment side covering portion are integrally connected, and the transmission line and the electric device are not deformed. Can be interposed between.

  And if a response acceleration acts on a bushing from an electric equipment by an earthquake etc., a connection part will break according to the magnitude | size of a response acceleration. Thereby, the flexible part between the power transmission line side covering part and the electric equipment side covering part is released from the restriction of the connecting part between the power transmission line side covering part and the electric equipment side covering part, and can be made flexible. Become. Since the length of the transmission line side covering portion is shorter than the length of the entire bushing, the amplitude of the end portion on the connection side of the transmission line side covering portion with the transmission line is larger than that when the entire bushing is fixed. Get smaller. Further, since the response acceleration applied to the power transmission line side covering portion and the electric equipment side covering portion is attenuated by the flexible movement of the flexible portion, the bushing can be prevented from being broken or broken.

  Here, in the bushing according to the present invention, the power transmission line side covering portion has a first flange protruding outward at a connection position with the flexible portion, and the electric equipment side covering portion is formed with the flexible portion. A second flange that protrudes outward at the connection position, and the flexible portion includes a third flange that protrudes outward at a position to connect the power transmission line side covering portion and the electric equipment side covering portion, and It has a 4th flange, and a connecting part fixes a 1st flange, a 2nd flange, a 3rd flange, and a 4th flange, and integrates a power transmission line side covering part, an electric equipment side covering part, and a flexible part. You may connect to.

  According to such a configuration, the first flange and the third flange are fixed, and the second flange and the fourth flange are fixed, so that the power transmission line side covering portion and the electric equipment side covering portion are flexible portions. Connected through. And a power transmission line side coating | coated part and an electric equipment side coating | coated part are connected via a connection part by fixing a 1st flange, a 2nd flange, a 3rd flange, and a 4th flange. Thereby, since a connection part regulates the position of the 1st flange and the 3rd flange to the 2nd flange and the 4th flange, in normal use, a power transmission line side covering part and an electric equipment side covering part act from the outside. A structure that does not vibrate by force, that is, does not vibrate the entire bushing can be obtained.

  Furthermore, in the bushing according to the present invention, the connecting portion has a fastener, and the shaft body of the fastener is inserted into insertion holes formed in the first flange, the second flange, the third flange, and the fourth flange, respectively. The first flange, the second flange, the third flange, and the fourth flange may be fixed by being fastened in this state.

  According to such a configuration, since the first flange, the second flange, the third flange, and the fourth flange are fixed using the fastener, even if the shaft portion of the fastener is broken due to an earthquake or the like, it is replaced. Just restore the electrical equipment.

  Further, in the bushing according to the present invention, the weakened portion is formed in the shaft body, so that the connecting portion acts from the electrical device side covering portion in a direction orthogonal to the longitudinal direction of the power transmission line side covering portion. You may make it break with respect to this force.

  According to such a configuration, when a predetermined force acts in a direction orthogonal to the longitudinal direction of the transmission line side covering portion from the electric equipment side covering portion due to an earthquake or the like, the direction orthogonal to the axial length direction of the shaft body of the connecting portion Also, a predetermined force acts. And since the weak part of a shaft body is weak with respect to predetermined force compared with other positions of a transmission line side covering part, an electric equipment side covering part, and this shaft body, a connection part breaks in a position of a weak part . As a result, even if a force that breaks or breaks the bushing, the connecting portion breaks before the bushing breaks or breaks. Accordingly, it is possible to more effectively prevent the bushing from being broken or damaged.

  The bushing according to the present invention is interposed between the electric equipment side covering portion and the electric equipment package, and the electric equipment side covering portion is flexible with respect to the electric equipment package. A flexible part that connects the covering part and the package, and an electric equipment side covering part and the package that are interposed between the electric equipment side covering part and the package, and integrally connecting the electric equipment side covering part and the package. You may further provide the connection part broken with respect to the force of the predetermined magnitude | size which acts on the direction orthogonal to the longitudinal direction of a part.

  According to such a configuration, the flexible part is also provided between the electric device side covering portion and the package, and the electric device side covering portion and the package are connected via the breakable connecting portion. Therefore, in normal use, the bushing does not vibrate due to an external force.

  When a force acts on the bushing from the package due to an earthquake or the like, the connecting part between the electrical equipment side covering part and the package breaks down as well as the connecting part between the transmission line side covering part and the electrical equipment side covering part. To do. Thereby, the flexible part between the electric equipment side coating | coated part and a package is also open | released from regulation of the connection part between the electric equipment side coating | coated part and a package. Thereby, the amplitude of the edge part of the connection side with the power transmission line of a power transmission line side coating | coated part can be made smaller. Further, since the response acceleration applied to the electric equipment side covering portion and the package is attenuated by the flexible movement of the flexible portion between the electric equipment side covering portion and the package, it is possible to prevent the bushing from being broken or damaged.

  In this bushing, the connecting portion between the electric device side covering portion and the package has a force larger than a force of a predetermined magnitude acting on the connecting portion between the power transmission line side covering portion and the electric device side covering portion. It may be broken by the action of.

  According to such a configuration, after the connecting portion between the power transmission line side covering portion and the electric equipment side covering portion is broken, the connecting portion between the electric device side covering portion and the package is broken. Thereby, even if a larger force is applied to the bushing, it is possible to prevent the bushing from being broken or damaged while suppressing the amplitude of the end of the transmission line side covering portion on the connection side with the transmission line.

  As described above, according to the bushing according to the present invention, the bushing can be more effectively prevented from breaking or damaging against a shake such as an earthquake, and the vibration that does not vibrate against an external force in normal use is excellent. Has an effect.

The side view of the bushing concerning one embodiment of the present invention is shown. The principal part side view of the connection part which concerns on the embodiment is shown. The AA sectional view in the connecting part of Drawing 2 concerning the embodiment is shown.

  Hereinafter, an embodiment of a bushing according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the bushing 1 is formed in a circular tube shape as a whole, and has a conductor (center conductor) 80 inside (inserted) between the power transmission line 2 and the electric device 3. And is used for high-voltage power transmission between the power transmission line 2 and the electrical equipment 3. The bushing 1 is erected between the power transmission line 2 and the electric device 3 with the opening direction directed toward the power transmission line 2 side and the electric device 3 side. The bushing 1 is erected on the package 3a of the electric device 3, thereby ensuring a distance between the power transmission line 2 and the package 3a and insulating the power transmission line 2 and the package 3a. The conductor 80 is inserted into the bushing 1 and filled with insulating oil or insulating gas (not shown). In this embodiment, the case where the bushing 1 is filled with insulating oil will be described.

  The bushing 1 includes a power transmission line side covering portion 10 that covers the power transmission line 2 side of the conductor 80, an electric device side covering portion 20 that covers the electric device 3 side of the conductor 80, and the power transmission line side covering portion 10 and the electric device side. The power transmission line side covering portion 10 and the electric equipment side covering portion 20 are connected so that the power transmission line side covering portion is flexible with respect to the electric equipment side covering portion 20. The flexible portion 30 is interposed between the power transmission line side covering portion 10 and the electric equipment side covering portion 20, and electrically connects the power transmission line side covering portion 10 and the electric equipment side covering portion 20 together. A connecting portion 40 that breaks against a force of a predetermined magnitude that acts in a direction orthogonal to the longitudinal direction of the transmission line side covering portion 10 from the device side covering portion 20 and a cover 50 that covers the flexible portion 30 are provided.

  The power transmission line side covering portion 10 is connected to the insulating oil expansion chamber 11 connected to the power transmission line 2, the soot tube 12 provided between the insulating oil expansion chamber 11 and the flexible portion 30, and the flexible portion 30 of the soot tube 12. And a first flange 13 provided at the connection position.

  The insulating oil expansion chamber 11 is provided to adjust the pressure of the insulating oil filled in the bushing 1. When the volume of the insulating oil expands due to heat generated by the conductor 80 inserted into the bushing 1, excess insulating oil flows into the insulating oil expansion chamber 11. A conductor 80 is inserted into the insulating oil expansion chamber 11 from the power transmission line 2 toward the package 3a.

  The soot tube 12 is formed in a long shape, and is connected to the insulating oil expansion chamber 11 and the first flange 13 at each of its longitudinal ends. The soot tube 12 is made of porcelain, filled with insulating oil, and an electric wire (center conductor) 80 is inserted therethrough.

  The first flange 13 is made of metal, is provided at the end of the soot tube 12 connected to the flexible portion 30, and is provided so as to protrude in a direction orthogonal to the longitudinal direction of the soot tube 12. That is, the first flange 13 is provided so as to protrude in the radially outward direction of the soot tube 12. For example, the first flange 13 is provided by being connected to the end of the soot tube 12 with cement. The first flange 13 is connected to one end of the flexible portion 30 by welding or the like so that the insulating oil does not leak from the connection portion between the first flange 13 and the flexible portion 30.

  The first flange 13 has an insertion hole (not shown) through which the connecting portion 40 can be inserted. The insertion hole is provided through the first flange 13 in the longitudinal direction of the soot tube 12.

  The electric equipment side covering portion 20 includes a soot tube 21 provided between the flexible portion 30 and the package 3a, and a second flange 22 provided at a connection position of the soot tube 21 to the flexible portion 30.

  The soot tube 21 is formed in a long shape, and is connected to the flexible portion 30 and the package 3a at each of its longitudinal ends. The soot tube 21 is made of porcelain, filled with insulating oil, and a conductor 80 is inserted therethrough.

  The second flange 22 is made of metal, provided at the end of the soot tube 21 connected to the flexible portion 30, and provided so as to protrude in a direction orthogonal to the longitudinal direction of the soot tube 21. That is, the second flange 22 is provided so as to protrude in the radially outward direction of the soot tube 21. For example, like the first flange 13, the second flange 22 is provided by being connected to the end portion of the soot pipe 21 with cement. The second flange 22 is connected to the other end of the flexible portion 30 by welding or the like so that the insulating oil does not leak from the connection portion between the second flange 22 and the flexible portion 30.

  Similar to the first flange 13, the second flange 22 has an insertion hole (not shown) through which the connecting portion 40 can be inserted. The insertion hole of the second flange 22 is provided through the second flange 22 in the longitudinal direction of the soot tube 21. The axial length direction of the insertion hole of the second flange 22 is provided to coincide with the longitudinal direction of the soot tube 21. The insertion hole of the second flange 22 is provided at a position that coincides with the insertion hole of the first flange 13 in the axial length direction.

  As shown in FIG. 2, the flexible portion 30 includes a bellows 31 having flexibility with respect to the longitudinal direction of the electric equipment side covering portion 20, a third flange 32 provided at one end of the bellows 31, and the bellows 31. And a fourth flange 33 provided at the other end.

  The bellows 31 is formed in a cylindrical shape with metal, for example. The bellows 31 is connected to the power transmission line side covering portion 10 and the electric equipment side covering portion 20 with the openings facing the longitudinal end portion of the soot tube 12 and the longitudinal end portion of the soot tube 21. The bellows 31 is provided so as to be flexible with respect to the longitudinal direction of the soot tube 21.

  The third flange 32 is made of metal and is welded to one end of the bellows 31 connected to the soot tube 12. The third flange 32 protrudes in a direction orthogonal to the longitudinal direction of the connected soot tube 12. That is, the third flange 32 is provided so as to protrude in the radially outward direction of the bellows 31. The third flange 32 is connected to the flange surface of the first flange 13 by welding or the like. Specifically, the third flange 32 is brought into contact with the flange surface of the first flange 13 at its flange surface, and the entire periphery thereof is welded and connected integrally with the periphery of the first flange 13. As a result, the insulating oil is prevented from leaking from the connecting portion between the first flange 13 and the third flange 32.

  Similar to the first flange 13 and the second flange 22, the third flange 32 has an insertion hole (not shown) through which the connecting portion 40 can be inserted. The insertion hole of the third flange 32 is provided through the third flange 32 in the longitudinal direction of the soot tube 12. The axial length direction of the insertion hole of the third flange 32 is provided so as to coincide with the longitudinal direction of the soot tube 12. The insertion hole of the third flange 32 is provided at a position that coincides with the insertion hole of the first flange 13 and the insertion hole of the second flange 22 in the axial length direction.

  The fourth flange 33 is made of metal and is welded to the other end of the bellows 31 connected to the soot tube 21. The fourth flange 33 is provided so as to protrude in a direction orthogonal to the longitudinal direction of the connected soot tube 21. That is, the fourth flange 33 is provided so as to protrude in the radially outward direction of the bellows 31. The fourth flange 33 is connected to the flange surface of the second flange 22 by welding or the like. Specifically, the fourth flange 33 is in contact with the flange surface of the second flange 22 at its flange surface, and the entire periphery thereof is welded and connected integrally with the periphery of the second flange 13. As a result, the insulating oil is prevented from leaking from the connecting portion between the first flange 13 and the third flange 32.

  Similar to the first flange 13, the second flange 22, and the third flange 32, the fourth flange 33 has an insertion hole (not shown) through which the connecting portion 40 can be inserted. The insertion hole of the fourth flange 33 is provided through the fourth flange 33 in the longitudinal direction of the soot tube 21. The axial length direction of the insertion hole of the fourth flange 33 is provided to coincide with the longitudinal direction of the soot tube 21. Further, the insertion hole of the fourth flange 33 is provided at a position that coincides with the insertion hole of the first flange 13, the insertion hole of the second flange 22, and the insertion hole of the third flange 32 in the axial length direction.

  For example, the connecting portion 40 is formed of metal as a whole, and by fixing the first flange 13, the second flange 22, the third flange 32, and the fourth flange 33, the transmission line side covering portion 10, the electric equipment side covering The positions of the portion 20 and the flexible portion 30 are regulated. In other words, the connecting portion 40 regulates the position of the transmission line side covering portion 10 by matching the axial length direction of the power transmission line side covering portion 10, the axial length direction of the electric equipment side covering portion 20, and the axial length direction of the flexible portion 30. To do.

  The connecting portion 40 is fastened to both ends of the bolt 41 inserted as a shaft 41 inserted into the insertion holes of the first flange 13, the second flange 22, the third flange 32, and the fourth flange 33. And a nut 42.

  One end of the bolt 41 is inserted through the insertion hole of the first flange 13 and the insertion hole of the third flange 32, and the other end is inserted through the insertion hole of the second flange 22 and the insertion hole of the fourth flange 33. The bolt 41 has a thread part at least at both ends, and a nut 42 can be screwed into both ends. The bolt 41 has a notch (not shown) in order to provide a weakened portion at an intermediate portion in the longitudinal direction and cause stress concentration therein. The bolt 41 functions as a weak pin by breaking due to stress concentration at the bottom of the notch.

  Here, a plurality of bolts 41 are preferably provided. In this embodiment, as shown in FIG. 3, the power transmission line side covering portion 10, the electric equipment side covering portion 20, and the flexible portion 30 are fastened by six bolts 41a, 41b, 41c, 41d, 41e, and 41f. The case will be explained.

  Each of the six bolts 41a, 41b, 41c, 41d, 41e, and 41f has a notch (not shown) at an intermediate portion in the longitudinal direction. Then, the six bolts 41 a, 41 b, 41 c, 41 d, 41 e, 41 f are arranged at equal intervals along the circumferential direction of the bellows 31. Each of the notches provided in the six bolts 41a, 41b, 41c, 41d, 41e, and 41f preferably has a bottom having a different shape. In other words, each of the notches provided in the six bolts 41a, 41b, 41c, 41d, 41e, and 41f preferably has a bottom portion having a different curvature.

  Each of the six bolts 41a, 41b, 41c, 41d, 41e, and 41f is preferably arranged in the order of the curvature at the bottom of the notch. For example, it is assumed that the magnitude of the curvature of the notch is bolt 41a> bolt 41b = bolt 41c> bolt 41d = bolt 41e> bolt 41f. In this case, the bolt 41b and the bolt 41c are arranged adjacent to the bolt 41a. A bolt 41d is disposed adjacent to the bolt 41b. A bolt 41e is disposed adjacent to the bolt 41c. A bolt 41f is disposed adjacent to the bolt 41d and the bolt 41e.

  As a result, the bolt 41 a and the bolt 41 f are arranged at positions that are symmetric with respect to the axis of the conductor 80. The bolt 41 b and the bolt 41 e are disposed at positions that are symmetric with respect to the axis of the conductor 80. The bolt 41 c and the bolt 41 d are disposed at target positions with respect to the axis of the conductor 80.

  Thus, by arranging the six bolts 41a, 41b, 41c, 41d, 41e, and 41f, the initial breakage position of the bolt 41 can be defined in the bolt 41a. Then, after the bolt 41a breaks due to shaking due to an earthquake or the like, the bolt 41b and the bolt 41c break, then the bolt 41d and the bolt 41e break, and finally the bolt 41f breaks. In this way, the bolt 41 can be broken smoothly. Moreover, the first flexible movement direction of the soot tube 12 when the bolt 41 breaks can be defined. Thereby, when the bushings 1 are arranged adjacent to each other, the first flexible movement direction of the respective bushings 1 can be determined. Can be prevented.

  The nut 42 is made of metal and fastened to the bolt 41 to fix the first flange 13, the second flange 22, the third flange 32, and the fourth flange 33. A pair of nuts 42 is prepared for the bolt 41. The nut 42 is inserted into the third flange 13 from the first flange 13 and the second flange 22 side in a state where the bolt 41 is inserted through the first flange 13, the second flange 22, the third flange 32 and the fourth flange 33. The first flange 13, the second flange 22, the third flange 32, and the fourth flange 33 are fixed by being fastened to the bolt 41 toward the flange 32 and the fourth flange 33 side.

  The cover 50 is formed of a conductive material, and in particular, in the configuration of the first flange 13, the second flange 22, the flexible portion 30, or the connecting portion 40, for the purpose of preventing corona discharge from a portion that becomes a protrusion. Provided. In the present embodiment, the cover 50 has a structure in which the soot tube 12 and the soot tube 21 are inserted, and has a structure that covers the first flange 13, the second flange 22, the flexible portion 30, and the connecting portion 40. Note that the cover 50 may have any configuration as long as it covers the first flange 13, the second flange 22, the flexible portion 30, and the portions that serve as the protrusions of the connecting portion 40.

  The configuration of the bushing 1 according to the present embodiment is as described above. Next, the operation of the bushing 1 according to the present embodiment will be described.

  First, in a normal time, the electric equipment side covering portion 20 is fixed to the package 3a. And the power transmission line side coating | coated part 10 is being fixed to the electric equipment side coating | coated part 20 via the connection part 40. FIG. The connecting portion 40 prevents the flexible portion 30 from being flexible while fixing the gap between the first flange 13 of the power transmission line side covering portion 10 and the second flange 22 of the electric equipment side covering portion 20. ing.

  Therefore, even if a force acts in the direction orthogonal to the longitudinal direction of the bushing 1 from the power transmission line 2, the bushing 1 does not vibrate or deform. That is, even if a force acts from the power transmission line 2 in a direction orthogonal to the longitudinal direction of the bushing 1, the power transmission line side covering portion 10, the electric equipment side covering portion 20 and the flexible portion 30 are fixed to the package 3a. The bushing 1 does not vibrate or deform.

  On the other hand, when a predetermined force or more acts on the bushing 1 due to an earthquake or the like, the bolt 41 breaks. Specifically, the force transmitted from the package 3 a to the bushing 1 in the direction orthogonal to the longitudinal direction of the bushing 1 is transmitted to the connecting portion 40 via the electric device side covering portion 20. And stress concentration arises in the bottom part of the notch provided in the volt | bolt 41 of the connection part 40. FIG.

  Since stress concentration occurs in the notch of the bolt 41, the six bolts 41a, 41b, 41c, 41d, 41e, and 41f are sequentially broken from the bolt 41a that is most easily broken to the bolt 41f. As a result, the bellows 31 is first flexible from the longitudinal direction of the soot tube 21 in the direction of the bolt 41a. Since the bellows 31 becomes flexible in the direction of the bolt 41a, the soot tube 12 becomes flexible in the direction of the bolt 41a from the longitudinal direction. The bellows 31 is released from the fixing of the bolt 41 by breaking all six bolts 41a, 41b, 41c, 41d, 41e, and 41f. As a result, the bellows 31 can be flexed freely from the longitudinal direction of the soot tube 21.

  Thereby, the power transmission line side coating | coated part 10 can be freely flexible now with respect to the longitudinal direction by making the bellows 31 into a base end. Since the length of the power transmission line side covering portion 10 is shorter than the length of the bushing 1, the power transmission line side covering portion 10 alone is used with respect to the amplitude of the power transmission line side covering portion 10 when the entire bushing 1 vibrates. The amplitude when vibrating is smaller. Therefore, the response acceleration applied to the soot tube 12 is reduced. Moreover, since the bellows 31 is flexible, the response acceleration applied to the soot tube 21 is also reduced.

  As mentioned above, the bushing which concerns on this embodiment can reduce the amplitude of a soot pipe because a bolt breaks with respect to shaking, such as an earthquake. Thereby, it can prevent that a soot pipe breaks or breaks. When restoring the bushing, it can be easily restored by replacing the broken bolt and fastening with a nut. Therefore, it is possible to shorten the time until the electric device is restored and to reduce the cost as compared with the case where the bushing is manufactured again. Furthermore, since the soot tube does not break or break, the insulating oil does not leak into the environment. Therefore, a safer electrical device can be provided.

  Further, in the bushing according to the present embodiment, the connecting portion integrally connects the power transmission line side covering portion, the electric equipment side covering portion, and the flexible portion in the normal state. Even if it is installed, it can be installed without bending the bushing. Furthermore, the standing bushing does not sway due to the tension of the transmission line or the wind, and the bushing can be stably installed.

  In addition, the bushing which concerns on this invention is not limited to above-described embodiment, Of course, various changes can be added in the range which does not deviate from the summary of this invention. Moreover, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.

  For example, in the bushing according to the present invention, a plurality of flexible portions 30 and connecting portions 40 may be provided in the bushing 1. For example, as shown in FIG. 1, the flexible part 60 and the connection part 70 may be provided in the base part of the electric equipment side coating | coated part 20 to which the bushing 1 and the package 3a are connected. In this case, the soot tube 21 further has a fifth flange 23 connected to one end of the flexible portion 60 at the end opposite to the end where the second flange 22 is provided. In addition, a sixth flange 3 b connected to the other end of the flexible portion 60 is provided at a contact portion of the electric device 3 with the bushing 1, that is, at an end portion of the bushing pocket.

  The fifth flange 23 is made of metal, and is connected to one end of the flexible portion 60 by welding or the like so that the insulating oil does not leak from the connection portion between the fifth flange 23 and the flexible portion 60. Since the structure of the other 5th flange 23 is the same as that of the 1st flange 13, description here is abbreviate | omitted.

  The fifth flange 23 has an insertion hole (not shown) through which the connecting portion 70 can be inserted. Since the structure and function of the insertion hole are the same as the function of the insertion hole provided in the first flange 13 to the fourth flange 33, description thereof is omitted here.

  The sixth flange 3b is made of metal, and is welded to, for example, the end of the bushing pocket. The sixth flange 3b is connected to the other end of the flexible portion 60 by welding or the like so that the insulating oil does not leak from the connection portion between the sixth flange 3b and the flexible portion 60.

  Similar to the fifth flange 23, the sixth flange 3b has an insertion hole (not shown) through which the connecting portion 70 can be inserted. Since the structure and function of the insertion hole are the same as the function of the insertion hole provided in the first flange 13 to the fourth flange 33, description thereof is omitted here.

  Similar to the flexible portion 30, the flexible portion 60 includes a bellows 61, a seventh flange 62 provided at one end of the bellows 61, and an eighth flange 63 provided at the other end of the bellows 61. Since the bellows 61 has the same function as the bellows 31 of the flexible part 30, description here is abbreviate | omitted.

  The seventh flange 62 is made of metal and is welded to one end of the bellows 61 connected to the soot tube 21. The seventh flange 62 is provided to project in a direction orthogonal to the longitudinal direction of the connected soot tube 21. That is, the seventh flange 62 is provided so as to protrude in the radially outward direction of the bellows 61. The seventh flange 62 is connected to the flange surface of the fifth flange 23 by welding or the like. Specifically, the seventh flange 62 is in contact with the flange surface of the fifth flange 23 at its flange surface, and the entire periphery thereof is welded and connected integrally with the periphery of the fifth flange 23. As a result, the insulating oil is prevented from leaking from the connecting portion of the fifth flange 23 and the seventh flange 62.

  The seventh flange 62 has an insertion hole (not shown) through which the connecting portion 70 can be inserted, similarly to the fifth flange 23 and the sixth flange 3b. Since the structure and function of the insertion hole are the same as the function of the insertion hole provided in the first flange 13 to the fourth flange 33, description thereof is omitted here.

  The eighth flange 63 is made of metal and is welded to the other end of the bellows 61 connected to the package 3a. The eighth flange 63 is provided to project in a direction orthogonal to the longitudinal direction of the soot tube 21 connected to the seventh flange 62. That is, the eighth flange 63 is provided so as to protrude in the radially outward direction of the bellows 61. The eighth flange 63 is connected to the flange surface of the sixth flange 3b by welding. Specifically, the eighth flange 63 is in contact with the flange surface of the sixth flange 3b at its flange surface, and its entire periphery is welded and connected to the periphery of the sixth flange 3b. As a result, the insulating oil is prevented from leaking from the connecting portion of the sixth flange 3b and the eighth flange 63.

  Similarly to the fifth flange 23 to the seventh flange 62, the eighth flange 63 also has an insertion hole (not shown) through which the connecting portion 70 can be inserted. Since the structure and function of the insertion hole are the same as the function of the insertion hole provided in the first flange 13 to the fourth flange 33, description thereof is omitted here.

  The connection part 70 has a bolt and a nut similarly to the connection part 40. The bolt is inserted into the insertion hole of the fifth flange 23, the insertion hole of the sixth flange 3b, the insertion hole of the seventh flange 62, and the insertion hole of the eighth flange 63, and fastened with a nut. Thereby, the connection part 70 regulates the flexible movement of the flexible part 60. That is, the connecting part 70 restricts the flexible part 60 from being flexible from the longitudinal direction of the electric equipment side covering part 20. The other configuration of the connecting portion 70 and the arrangement relationship of the bolts are the same as the configuration of the connecting portion 40 and the arrangement relationship of the bolts 41, and thus description thereof is omitted here.

  In addition, it is preferable that the bolt of the connection part 70 has a notch which is less likely to cause stress concentration than the bolt 41 of the connection part 40. That is, it is preferable that the bolt of the connecting portion 70 be broken by the action of a larger force with respect to the bolt 41 of the connecting portion 40. Specifically, the notch provided in the bolt of the connecting portion 70 preferably has a bottom portion with a smaller curvature than the six bolts 41a, 41b, 41c, 41d, 41e, and 41f.

  With such a configuration, the flexible part 30 is released from the regulation by first breaking the bolt 41 of the connecting part 40 against a shake caused by an earthquake or the like. Thereby, the response acceleration applied from the electric equipment side covering portion 20 to the power transmission line side covering portion 10 can be reduced, and the amplitude of the power transmission line side covering portion 10 can be reduced as compared with the case where the entire bushing 1 vibrates. Therefore, it is possible to prevent the broken pipe 12 of the power transmission line side covering portion 10 from being broken or damaged.

  And if force acts on the electric equipment side coating | coated part 20 from the package 3a by the influence of a stronger shaking, the volt | bolt of the connection part 70 will break. Moreover, since the arrangement | positioning relationship of a volt | bolt is the same as the arrangement | positioning relationship of the volt | bolt 41, the electric equipment side coating | coated part 20 can be flexed in the same direction as the case where the volt | bolt 41 breaks. Thereby, the response acceleration applied to the electric equipment side coating | coated part 20 from the package 3a can be reduced. Accordingly, it is possible to more effectively prevent the broken tube 21 of the electric equipment side covering portion 20 from being broken or damaged.

  Moreover, the bushing which concerns on this invention may provide the some flexible part 30 and the connection part 40 in the middle part. That is, the bushing according to the present invention may be provided with a plurality of flexible portions 30 and connecting portions 40 with appropriate intervals in the longitudinal direction. Thereby, since the amplitude of the part demarcated by the flexible part 30 is reduced, the breakage or breakage of the bushing 1 can be more effectively prevented.

  In the bushing according to the present invention, the weakened portion in the connecting portion 40 is not limited to the notch as long as the bolt 41 is broken or a manufacturing method, and any structure or manufacturing method may be adopted. Good. For example, the diameter of the middle part of the bolt 41 may be made smaller than the other parts (regardless of whether it is coaxial or eccentric shaft). Further, the change in the strength of the bolts 41a, 41b, 41c, 41d, 41e, and 41f can be realized by various structures or manufacturing methods. For example, when the bolt 41 is manufactured by sintering, the bolts 41a, 41b, 41c, 41d, 41e, 41f are changed by changing the degree of sintering of the bolts 41a, 41b, 41c, 41d, 41e, 41f. Changes in strength can be achieved.

  Further, the strength can be changed by changing the thicknesses of the positions where the notches of the bolts 41a, 41b, 41c, 41d, 41e, and 41f are formed. Further, a resin having rigidity lower than that of the metal portion of the bolt 41 may be adopted for the notch portion of the bolt 41 to further change the strength of the resin.

  Alternatively, the bolt 41 and the nut 42 may be molded with two resins, and one resin may be engaged with the other resin. In this case, when stress is applied to the bolt 41 due to shaking such as an earthquake, the restriction of the flexible portion 30 may be released by releasing the engagement between one resin and the other resin.

  Note that the bolts 41 a, 41 b, 41 c, 41 d, 41 e, 41 f in the above embodiment may be arranged so as to gradually change along the circumferential direction of the bellows 31. For example, the ease of breakage of the bolt 41 is set as bolt 41a> bolt 41b> bolt 41c> bolt 41d> bolt 41e> bolt 41f. And you may arrange | position from the bolt 41a to the bolt 41f along the circumferential direction of the bellows 31 in order. The first flexible movement direction of the power transmission line side covering portion 10 can also be defined by arranging the bolts 41 in this way.

  Moreover, in the said embodiment, although demonstrated when the six volt | bolts 41a, 41b, 41c, 41d, 41e, and 41f were provided, the number of the volt | bolts 41 is not restrict | limited to this number. Further, by increasing the number of bolts of the connecting portion 70 relative to the number of bolts 41 of the connecting portion 40, the connecting portion 70 may be broken by the action of a force larger than the force acting on the connecting portion 40. Good.

  Moreover, in the said embodiment, although the bushing 1 with which insulating oil is filled was demonstrated, insulating gas may be filled inside.

  Moreover, in the said embodiment, although the bellows 31 and 61 were metal, they may be formed with resin and may be formed with elastic bodies, such as rubber | gum.

  DESCRIPTION OF SYMBOLS 1 ... Bushing, 2 ... Power transmission line, 3 ... Electric equipment (bushing pocket), 3a ... Package, 3b ... 6th flange, 10 ... Power transmission line side coating | coated part, 11 ... Insulation oil expansion chamber, 12 ... Saddle pipe, 13 ... 1st DESCRIPTION OF SYMBOLS 1 flange, 20 ... Electrical equipment side coating | coated part, 21 ... Saddle pipe, 22 ... 2nd flange, 23 ... 5th flange, 30 ... Flexible part, 31 ... Bellows, 32 ... 3rd flange, 33 ... 4th flange, 40 ... Connection part, 41 ... Bolt, 42 ... Nut, 50 ... Cover, 60 ... Flexible part, 61 ... Bellows, 62 ... Seventh flange, 63 ... Eighth flange, 70 ... Connection part, 80 ... Conductor

Claims (6)

A bushing having a conductor inside and interposed between a power transmission line and an electric device,
A long transmission line side covering portion covering the power transmission line side of the conductor, a long electric device side covering portion covering the electric equipment side of the conductor, a transmission line side covering portion, and an electric equipment side covering portion A flexible portion connecting the power transmission line side covering portion and the electric equipment side covering portion so as to be flexible with respect to the electric device side covering portion, The length of the transmission line side covering portion from the electric device side covering portion is interposed between the side covering portion and the electric device side covering portion, and integrally connecting the transmission line side covering portion and the electric device side covering portion. A bushing comprising: a connecting portion that breaks against a force of a predetermined magnitude acting in a direction orthogonal to the direction.   The power transmission line side covering portion has a first flange protruding outward at the connection position with the flexible portion, and the electric equipment side covering portion is protruded outward at the connection position with the flexible portion. The flexible portion has a third flange and a fourth flange projecting outward at positions where the power line side covering portion and the electric equipment side covering portion are connected to each other. The power line side covering portion, the electric equipment side covering portion, and the flexible portion are integrally connected by fixing the first flange, the second flange, the third flange, and the fourth flange. Bushing as described in.   The coupling portion has a fastener, and the shaft body of the fastener is fastened in a state of being inserted into insertion holes formed in the first flange, the second flange, the third flange, and the fourth flange, The bushing according to claim 2, wherein the first flange, the second flange, the third flange, and the fourth flange are fixed.   By forming the fragile part in the shaft body, the connecting part breaks against a force of a predetermined magnitude acting in a direction perpendicular to the longitudinal direction of the transmission line side covering part from the electric equipment side covering part. The bushing according to claim 3, wherein the bushing is characterized.   It is interposed between the electric device side covering portion and the electric device package, and the electric device side covering portion and the package can be connected so that the electric device side covering portion is flexible with respect to the electric device package. The bending portion is interposed between the electric device side covering portion and the package, and integrally connects the electric device side covering portion and the package, and in a direction orthogonal to the longitudinal direction of the electric device side covering portion. The bushing according to any one of claims 1 to 4, further comprising a connecting portion that breaks against a predetermined magnitude of force that acts.   The connecting part between the electric equipment side covering part and the package is broken by the action of a force larger than a predetermined force acting on the connecting part between the transmission line side covering part and the electric equipment side covering part. The bushing according to claim 5, wherein:

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