JP4920537B2 - High voltage electrical equipment - Google Patents

Description

  The present invention relates to a high-voltage electric device having a bushing and a through-type current transformer attached to the bushing, and a current transformer attachment for a high-voltage electric device used for attaching the through-type current transformer to the bushing of the high-voltage electric device. Is.

  In an electrical device to which a high voltage is applied such as a high voltage switch or a transformer, a bushing is attached to a case housing the electrical device body, and the electrical device body and an external circuit are connected through the bushing. . In general, a bushing is provided between a base portion that is inserted into a case through a bushing mounting hole provided in a case of the device, a bushing main portion that is disposed outside the case, a base portion, and a bushing main portion. A bushing main body integrally having a flange portion and a flange portion disposed outside the case, and a central conductor that passes through the bushing main body in the axial direction and is connected to the electric device main body within the case. The collar is fixed to the case by a collar fixing bracket and attached to the case.

  When a through-type current transformer is attached to the bushing of a high-voltage electric device, a resin-molded current transformer in which a coil is molded with a resin is used as the current transformer to ensure the insulation performance of the current transformer. In many cases, however, resin-molded current transformers are expensive, which increases the cost of electrical equipment.

  Therefore, it is conceivable to use a dry-type current transformer in which the coil is not molded with resin. However, since the dry-type current transformer has poor insulation performance, it ensures sufficient dielectric strength for the live part when it is attached to the bushing. It is necessary to consider that. Therefore, as shown in Patent Document 1, it has been proposed to attach a through-type current transformer to the base of the bushing via a current transformer fitting made of an insulating material such as rubber.

  The current transformer attachment shown in Patent Document 1 is provided in a state of passing through the bushing attachment hole together with the base of the bushing body, and is interposed between the outer periphery of the base of the bushing body and the inner periphery of the current transformer. A cylindrical portion, a large-diameter flange formed at one end in the axial direction of the cylindrical portion disposed inside the case of the electric device and abutted against one end in the axial direction of the current transformer, and outside the case A small-diameter flange that is formed at the other end in the axial direction of the disposed cylindrical portion and disposed between the outer surface of the case and the flange portion of the bushing is integrally provided. The insulation between the live parts is secured by the flange.

This current transformer fitting is made of a molded product of an insulating material such as rubber, and the distance between the large diameter flange and the small diameter flange is set sufficiently larger than the axial dimension of the current transformer. ing.
The current transformer is placed between the large diameter flange of the current transformer fitting and the inner surface of the case, but the distance between the large diameter flange and the small diameter flange is larger than the axial dimension of the current transformer. Since it is set to be sufficiently large, the current transformer is mounted in a state that can be displaced to some extent in the axial direction. The current transformer is also held in a state where it can rotate indefinitely in the circumferential direction of the cylindrical portion of the current transformer fitting.

In addition, in the current transformer attachment shown in Patent Document 1, two through holes are provided in the large-diameter flange, and the lead wires drawn from the current transformer are passed through these through holes, whereby the lead wires Is locked to a large-diameter flange.
Japanese Patent Laid-Open No. 9-17647

  As shown in Patent Document 1, when the current transformer is held in a state where it can be displaced in the axial direction and the circumferential direction of the cylindrical portion of the current transformer mounting tool, the current transformer is axially or circumferentially moved. When a vibration or impact is applied, the current transformer is displaced in the axial direction and / or circumferential direction, tension is applied to the lead wire led out from the current transformer, and the lead wire may be disconnected. Further, when the current transformer is displaced in the axial direction, it may collide with the case and receive an impact, resulting in poor characteristics.

  In the current transformer attachment shown in Patent Document 1, two through holes are provided in the large-diameter flange, and the lead wires are drawn by passing the lead wires drawn out from the current transformer through these through holes. If the current transformer is held in a state where it can be displaced in the axial direction and circumferential direction, the current transformer has a large diameter when subjected to vibration or impact. Since the lead wire is displaced relative to the flange, even if the lead wire is locked to the large-diameter flange, it is not possible to prevent the lead wire from being tensioned or the current transformer being subjected to an impact.

  In the current transformer attachment shown in Patent Document 1, the distance between the large-diameter flange and the small-diameter flange is reduced to eliminate the gap between the current transformer and the case. Although it may be possible not to displace the transformer in the axial direction, in such a case, it is difficult to attach the current transformer fixture holding the current transformer to the bushing mounting hole of the case of the electric device. become.

  If the current transformer is not displaced in the axial direction by eliminating the gap between the current transformer and the case, the current transformer is placed in direct contact with the inner surface of the case. When an electric device is subjected to an impact, the impact is directly applied to the current transformer, and the characteristics of the current transformer may change.

  In addition, even if there is no gap between the current transformer and the case, it is not possible to prevent the current transformer from being displaced (rotated) in the circumferential direction. It is impossible to prevent the lead wire from being displaced due to the displacement.

  Furthermore, as shown in Patent Document 1, when a hole for locking the lead wire is provided in the large-diameter flange of the current transformer attachment, the current transformer is Since the creeping insulation distance between the bushing and the central conductor (charged part) is shortened, the insulation performance between the current transformer and the charged part is lowered, and it is inevitable that the reliability is lowered.

  The object of the present invention is derived from a current transformer by attaching it to a bushing in a state where the current transformer is firmly fixed so as not to be displaced in the axial direction and circumferential direction without making it difficult to attach the current transformer. This eliminates the possibility that the lead wire is tensioned and the lead wire is disconnected, or that the current transformer collides with the case of the electrical device and its characteristics change, and that the insulation performance of the current transformer is reduced. An object of the present invention is to provide a high-voltage electrical apparatus that can prevent the above-described problem.

  The object of the present invention is to make it possible to attach the current transformer to the bushing in a state where the current transformer is firmly fixed so as not to be displaced in the axial direction and circumferential direction without making it difficult to attach the current transformer. In addition to eliminating the possibility that the lead wire that is led out from the transformer will be tensioned and the lead wire will break, or that the current transformer will collide with the case of the electrical device and its characteristics will change, and the insulation performance of the current transformer It is an object of the present invention to provide a current transformer attachment for a high-voltage electrical apparatus that can prevent a decrease in current.

  The present invention integrally includes a case having a bushing mounting hole and housing an electric device main body therein, a bushing main portion and a cylindrical base portion aligned in the axial direction, and a flange portion at an end portion on the base side of the bushing main portion. With the base part inserted through the bushing mounting hole and inserted into the case, and the bushing main part and the collar part provided outside the case and the bushing main body provided in the axial direction A bushing having a central conductor connected to the electrical device body in the case and the flange portion of the bushing body fixed to the case by the flange fixing bracket, and one end in the axial direction facing away from the bushing main portion Applied to high-voltage electrical equipment with a through-type current transformer attached to the bushing via a current transformer fitting and arranged to surround the base of the bushing body in the case That.

In the present invention, the current transformer mounting tool is provided in a state of passing through the bushing mounting hole together with the base of the bushing body, and the inner peripheral portion is fitted to the outer peripheral portion of the base portion of the bushing main body and the outer peripheral portion is current-transformed. It is formed at one end in the axial direction of the cylindrical portion that is fitted to the inner peripheral portion of the transformer and holds the current transformer and the cylindrical portion that is disposed inside the case, and is in contact with one end in the axial direction of the current transformer. The first flange and the second flange formed at the other end in the axial direction of the cylindrical portion disposed outside the case and integrally sandwiched between the outer surface of the case and the buttocks of the bushing body are integrally provided. An annular body separate from the fixture body, which is formed so as to surround the cylindrical portion of the current transformer fixture with an insulating material having elasticity such as rubber, and is fitted to the cylindrical portion. it becomes a member, in the axial direction of the current transformer and the other end and cable And a cushioning member disposed in a compressed state between the inner surface. The fixture main body is made of an insulating material having flexibility, and the dimension of the first flange is set so that the outer peripheral edge of the first flange is disposed outside the outer periphery of the current transformer. . The outer diameter of the buffer member is set to be larger than the outer diameter of the current transformer, and the thickness of the buffer member is such that the current transformer is fixed in the axial direction and the circumferential direction by the buffer member arranged in a compressed state. Is set.

As described above, the cylindrical portion provided in a state of passing through the bushing mounting hole together with the base portion of the bushing main body, and the first flange and the second flange respectively formed at one end and the other end in the axial direction of the cylindrical portion. And holding the current transformer on the outer periphery of the cylindrical portion, the first flange is brought into contact with one end in the axial direction of the current transformer inside the case, and the second flange is outside the case and the bushing body. A fixture main body sandwiched between the flange portion of the current transformer, and a fixture main body formed so as to surround the cylindrical portion of the current transformer fixture with an insulating material having elasticity, and fitted into the cylindrical portion; Is composed of a separate annular member, and a buffer member disposed in a compressed state between the other end in the axial direction of the current transformer held on the outer periphery of the cylindrical portion of the fixture body and the case; If the current transformer fixture is configured by Since the current transformer can be fixed so as not to move, it is possible to prevent the current transformer from being displaced in the axial direction and the circumferential direction, and when the vibration is applied from the outside, the current transformer is displaced by the displacement of the current transformer. It is possible to prevent the lead wire led out from the transformer from being disconnected, or the current transformer from hitting the case and applying an impact to the current transformer. In addition, since the vibration and impact transmitted to the current transformer can be absorbed by the buffer member having elasticity, it is possible to prevent the characteristics of the current transformer from being changed by vibration or impact given from the outside.

  In addition, since the buffer member is made of a material having elasticity, the second current so as to reduce the diameter of the second flange of the fixture body after the current transformer is held in the cylindrical portion of the fixture body. The current transformer is deformed by fitting the cylindrical portion of the fixture body into the bushing mounting hole by passing the second flange through the bushing mounting hole of the case while compressing the cushioning member in a state where the flange is deformed. Since it can be attached to the case, it is possible to hold the current transformer so as not to move without making any difficulty in attaching the current transformer.

  Furthermore, in the present invention, the entire first flange of the fixture main body disposed in the case is solidly formed (no hole is provided in the first flange), and the diameter of the first flange is changed. Since it is set to be larger than the outer diameter of the current transformer, the insulation performance of the current transformer can be improved by eliminating the part where the creeping insulation distance between the current transformer and the charged part is shortened, and its reliability is reduced. The risk of doing so can be eliminated.

  In the present invention, the lead wire led out from the current transformer is not locked to the flange of the current transformer fitting, but the current transformer is held so as not to be displaced in the axial direction and the circumferential direction. Even if the lead wire led out from the current transformer is not locked, no trouble is caused.

  The present invention also includes a case having a three-phase bushing mounting hole and housing a three-phase electric device body therein, a bushing main portion and a cylindrical base portion aligned in the axial direction, and a base portion of the bushing main portion. A bushing main body having a flange integrally at the end on the side, a base passing through a bushing mounting hole of each phase and being inserted into the case, and a bushing main portion and a flange disposed outside the case, and the bushing A bushing of each phase provided with a central conductor provided in a state penetrating through the body in the axial direction and connected to the electric device main body within the case, and the buttocks of the bushing main body being fixed to the case by the hook fixing brackets; The bushing of each phase is arranged by surrounding the base of the bushing body in the case with one end in the axial direction facing away from the bushing main part of the bushing of each phase. It can be applied to high voltage electrical equipment and a mounted phases of the feedthrough current transformer.

In this case, the current transformer fittings for the respective phases are provided in a state of passing through the bushing attachment holes for the respective phases together with the bases of the bushing bodies for the respective phase bushings, and the bushings for the bushings for the respective phases are provided on the inner peripheral portion. A cylindrical part that is fitted in the outer peripheral part of the base part of the main body and that holds the current transformer of each phase by fitting the outer peripheral part to the inner peripheral part of the current transformer of each phase, and a cylindrical part arranged inside the case A first flange formed at one end in the axial direction of each phase and abutted against one axial end of the current transformer of each phase, and a case formed at the other axial end of the cylindrical portion disposed outside the case A fitting main body integrally having a second flange sandwiched between an outer surface of the bushing and a flange portion of the bushing main body of each phase bushing, and a cylindrical portion of the current transformer fitting by an insulating material having elasticity. A fitting body formed to surround and fitted to the cylindrical portion Consists consist annular member separate, by a buffer member disposed in a compressed state between the axial other end and the casing of the inner surface of each phase of the current transformer. Also in this case, the attachment body of the current transformer attachment of each phase is made of a flexible insulating material, and the outer peripheral edge of the first flange is arranged outside the outer periphery of the current transformer. The dimension of the first flange is set to

  The present invention also includes a case having a three-phase bushing mounting hole and housing a three-phase electric device body therein, a bushing main portion and a cylindrical base portion aligned in the axial direction, and a base portion of the bushing main portion. A bushing main body having a flange integrally at the end on the side, a base passing through a bushing mounting hole of each phase and being inserted into the case, and a bushing main portion and a flange disposed outside the case, and the bushing A bushing of each phase provided with a central conductor provided in a state penetrating through the body in the axial direction and connected to the electric device main body within the case, and the buttocks of the bushing main body being fixed to the case by the hook fixing brackets; A current transformer fitting is formed so that one end in the axial direction is directed to the opposite side of the bushing main portion of each phase bushing and the base portion of the bushing body of the three-phase bushing is collectively surrounded in the case. Ri can also be applied to a high voltage electrical apparatus having a three-phase attached to the bushing feedthrough zero-phase current transformer.

In this case, the current transformer fitting is provided in a state of passing through the bushing mounting hole of each phase together with the base of the bushing main body of each phase bushing, and the base of the bushing main body of each phase bushing on the inner peripheral portion One end in the axial direction of a cylindrical portion disposed inside the case and a cylindrical portion holding the zero-phase current transformer with the outer peripheral portion inscribed in the inner peripheral portion of the zero-phase current transformer The first flange formed on the axial direction of the zero-phase current transformer and the other end in the axial direction of the cylindrical portion disposed outside the case are formed on the outer surface of the case and each phase. A fitting main body integrally having a second flange sandwiched between a bushing main body of the bushing and a cylindrical portion formed by surrounding the cylindrical portion of the fitting main body with a resilient insulating material. A separate ring from the fixture body fitted to the part It becomes a member, constituted by a cushioning member disposed in a compressed state between the axial other end and the casing of the inner surface of the zero-phase current transformer. Also in this case, the attachment body of the current transformer attachment of each phase is made of a flexible insulating material, and the outer peripheral edge of the first flange is arranged outside the outer periphery of the current transformer. The dimension of the first flange is set to

  In a preferred aspect of the present invention, the first flange of the current transformer fitting is provided to connect the three-phase cylindrical portions to each other.

  In another preferred aspect of the present invention, the first flange of the current transformer fitting projects from the flange body having a plate surface perpendicular to the axial direction of the cylindrical portion and the outer peripheral portion of the flange body to the second flange side. Thus, it is formed in a cup shape integrally having a peripheral wall portion surrounding at least a part of the outer periphery of the current transformer fitted to the outer periphery of the cylindrical portion.

  When the first flange is configured as described above, the creeping insulation distance between the current transformer and the charging unit can be further increased as compared with the case where the first flange is formed in a flat plate shape. The insulation performance of the current transformer can be made higher than when the first flange is formed in a flat plate shape.

The said buffer member can be comprised by the cyclic | annular member which was formed so that the cylindrical part of a current transformer attachment might be surrounded, and this cylindrical part was fitted. In this case, the buffer member and the fixture main body can be made of different materials, or can be made of the same material .

As described above, in the present invention, the cylindrical portion provided in a state of penetrating the bushing mounting hole together with the base portion of the bushing main body, the first flange and the first flange formed on one end and the other end in the axial direction of the cylindrical portion, respectively. 2 and holding the current transformer on the outer periphery of the cylindrical portion, the first flange is brought into contact with one end in the axial direction of the current transformer in the case, and the second flange is outside the case. In addition to the fixture body clamped between the case and the bushing body flange, and the axial direction of the current transformer made of a resilient insulating material and held on the outer periphery of the cylindrical portion of the fixture body Since the current transformer mounting fixture is configured by the buffer member disposed in a compressed state between the end and the case, the current transformer can be fixed by the buffer member so as not to move. Therefore, it is possible to prevent the current transformer from being displaced in the axial direction and the circumferential direction. When vibration is applied from the outside, the lead wire led out from the current transformer is disconnected due to the displacement of the current transformer. It is possible to prevent the current transformer from hitting the case and applying an impact to the current transformer. In addition, since the vibration and impact transmitted to the current transformer can be absorbed by the buffer member having elasticity, it is possible to prevent the characteristics of the current transformer from being changed by vibration or impact given from the outside.

  In the present invention, since the buffer member is made of an elastic material, the diameter of the second flange of the fixture body is reduced after the current transformer is held in the cylindrical portion of the fixture body. With the second flange deformed as described above, the second flange is passed through the bushing mounting hole of the case while compressing the buffer member, and the cylindrical portion of the fixture body is fitted into the bushing mounting hole. Since the current transformer can be attached to the case, the current transformer can be held so as not to move without making it difficult to attach the current transformer.

  Furthermore, in the present invention, the entire first flange of the fixture main body arranged in the case is solid, and the diameter of the first flange is set larger than the outer diameter of the current transformer. It is possible to improve the insulation performance of the current transformer by eliminating the portion where the creeping insulation distance between the current collector and the charging part is shortened, and to eliminate the possibility of reducing the reliability.

  In the present invention, the first flange of the current transformer fitting is protruded toward the second flange side from the outer peripheral portion of the flange main body and the flange main body having a plate surface orthogonal to the axial direction of the cylindrical main portion. When a cup-like shape is integrally formed with a peripheral wall portion that surrounds at least a part of the outer periphery of the current transformer that is fitted to the current transformer, the current flow is changed as compared with the case where the first flange is formed in a flat plate shape. Since the creeping insulation distance between the battery and the charging part can be further increased, the insulation performance of the current transformer can be made higher than when the first flange is formed in a flat plate shape.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show the main part of the first embodiment of the high-voltage electrical apparatus according to the present invention, FIG. 1 is a front view of the main part, and FIG. 2 (A) is a one-phase of the same embodiment. FIG. 4B is a sectional view taken along the line IIB-IIB in FIG. 1, FIG. 3 is a perspective view of the fixture body used in this embodiment, and FIG. It is the perspective view which showed the shock absorbing member which comprises a current transformer attachment with an attachment part main body in embodiment.

  1 to 4, reference numeral 1 denotes a case of an electric device configured in a box shape with a metal plate, and a high-voltage electric device main body for three-phase alternating current is accommodated in the case. High-voltage electrical equipment is electrical equipment to which a high voltage is applied, such as a load switch or a transformer.

  A bushing mounting hole 101 (see FIG. 2B) is formed for three phases through one side wall portion 100 of the case 1. Three-phase bushings 2u to 2w are attached to the case 1 through these three-phase bushing mounting holes, respectively, and three-phase current transformers 4u to 4w are connected to the bushings 2u to 2w via current transformer attachments 3, respectively. Is attached.

  Each bushing is made of an insulating material such as porcelain and has a bushing main portion 201a and a cylindrical base portion 201b arranged in a direction along a common axis, and a radial direction from an end portion on the base portion 201b side of the bushing main portion 201a. A bushing body 201 integrally having an annular flange 201c protruding outward, and a central conductor 202 provided in a state of passing through the bushing body 201 in the axial direction and connected to the electrical device body in the case It is a well-known one provided. The outer peripheral part of the bushing main part 201a is formed in a shape in which annular convex parts 201a1 and concave parts 201a2 are alternately arranged, and the base part of the terminal fitting 203 connected to the central conductor 202 is embedded in the tip part 201a3 of the bushing main part 201a. Has been. A bolt 204 and a nut 205 used for connecting a terminal attached to an end of an electric wire connected to an external circuit to the terminal fitting are attached to the terminal fitting 203.

  The bushing of each phase is arranged in a state where the base portion 201b is inserted into the case through the bushing mounting hole 101 of each phase, and the bushing main portion 201a and the flange portion 201c are positioned outside the case. The flange 201c is fixed to the case 1 by being pressed against the case 1 by the flange fixing bracket 5 fastened to the casing 1.

  In the present embodiment, three-phase through-type current transformers (bushing CT) 4u to 4w are attached to the bases of the three-phase bushings 2u to 2w. Each phase current transformer is a through-type current transformer that uses a bushing center conductor 202 as a primary conductor, and includes a secondary coil wound in a toroidal shape around an annular iron core that surrounds the circumference of the primary conductor. . As the through-type current transformer, there are a mold type in which the secondary coil is molded with resin and a dry type using insulating paper as an insulating member for insulating the secondary coil. A dry type current transformer is used. Each of the three-phase current transformers 4u to 4w is formed so as to form an annular shape, and each of the three-phase current transformers 4u to 4w annularly forms the base portion 201b of the bushing body 201 of the three-phase bushings 2u to 2w. Each inner diameter is set so that it can be concentrically surrounded through the gap. A lead wire 400 for extracting the output from each current transformer is derived.

  The three-phase current transformers 4u to 4w have bushings 2u to 2w in the case 1 facing one end in the axial direction toward the opposite side of the bushing main portion 201a of the bushing body 201 of the three-phase bushings 2u to 2w. It arrange | positions so that the base 201b of the bushing main body 201 may be surrounded, and is attached to the three-phase bushings 2u-2w by the current transformer attachment 3. FIG.

  In the present embodiment, a current transformer fitting 3 is provided for each phase bushing. As shown in FIG. 2 (B), each current transformer attachment 3 is provided in a state of passing through the bushing attachment hole 101 of each phase together with the base 201b of the bushing body 201 of the bushing of each phase, The inner peripheral portion is fitted to the outer peripheral portion of the base portion 201b of the bushing body 201 of each phase bushing, and the outer peripheral portion is fitted to the inner peripheral portion of each phase current transformer to hold the current transformer of each phase. The first flange 301b formed at one end in the axial direction of the cylindrical portion 301a disposed inside the case 1 and in contact with one end in the axial direction of the current transformer of each phase, and the case 1 And a second flange 301c formed at the other end in the axial direction of the cylindrical portion 301a arranged outside and sandwiched between the outer surface of the case 1 and the flange portion 201c of the bushing body of each phase bushing. Mounting tool body 3 1 (see FIG. 3) and an insulating member having elasticity such as rubber, and arranged in a compressed state between the other end in the axial direction of each phase current transformer and the inner surface of the case 1 It consists of a buffer member 302 (see FIG. 4).

  The mounting body 301 of the current transformer mounting 3 shown in FIG. 3 is made of an insulating material having flexibility and elasticity such as rubber, and the entire first flange 301b is solid (having holes. The outer peripheral edge of the first flange 301b of the mounting body 301 of the current transformer mounting fixture that is formed and attached to each phase current transformer is further outside the outer periphery of the current transformer of each phase. The outer diameter of the first flange 301b is set so that the first flange 301b protrudes radially outward from the outer periphery of the corresponding phase current transformer.

  The shock-absorbing member 302 shown in FIG. 4 is formed of an annular plate member that is formed so as to surround the cylindrical portion 301a of the current transformer fitting 3 and is fitted to the outer periphery of the cylindrical portion 301a. The inner diameter of the buffer member 302 is set to be approximately equal to or slightly larger than the outer diameter of the cylindrical portion 301a, and the outer diameter is larger than the outer diameter of the current transformers 4u to 4w, but the outer diameter of the first flange 301b. It is set smaller than. The fixture main body 301 and the buffer member 302 may be made of the same material, or may be made of different materials.

  Three or more bosses 6 arranged at equiangular intervals are welded to the outer surface of the side wall portion 100 of the case 1 around the opening portion of each mounting hole 101, and the center of the bushing is attached to the axial center portion of each boss 6. A stud bolt 7 extending in parallel with the axis is welded.

  The flange fixing bracket 5 is formed so as to surround the flange 201c of the bushing body 201 of each phase bushing, the second flange 301c of the attachment body 301 of the current transformer attachment, and the boss 6 from the outside. A circumferential wall portion 501 is arranged with one end in the direction facing the outer surface of the side wall portion 100 of the case via a gap, and the other end in the axial direction of the circumferential wall portion 501 is opposite to the base portion 201b of the bushing main body 201. It consists of the member which has integrally the inner collar part 502 contact | abutted to the end surface of the side collar part 201c. A hole having an inner diameter that allows the bushing main portion 201 to pass therethrough is formed inside the inner flange portion 502. Bolt insertion holes that allow the bolts 7 to pass therethrough are formed in the inner flange portion 502 of the flange fixing bracket 5, and nuts 8 are screwed into the bolts 7 that penetrate the inner flange portion 502. By tightening each nut 8, the flange portion 201 c of the bushing body is tightened against the side wall portion 100 of the case 1 via the second flange 301 c of the attachment body of the current transformer attachment 3, and the buffer member 302 is These are arranged in a compressed state between the other end in the axial direction of the current transformer of each phase and the inner surface of the case 1.

  When attaching each of the bushings 2u to 2w and the current transformers 4u to 4w to the case 1, the outer peripheral part of the cylindrical part 301a of the attachment body 301 for each phase is fitted to the inner peripheral part of the current transformer for each phase. One end of the current transformer in the axial direction is brought into contact with the first flange 301b of the fixture main body 301, and the buffer member 302 is fitted to the outer periphery of the cylindrical portion 301a of the fixture main body. 302 is brought into contact with the other end in the axial direction of the current transformer. Next, the diameter of the second flange 301c of the fixture body is reduced, the second flange 301c is engaged with the attachment hole 101, and the second attachment member 101 is passed through the attachment hole 101 while compressing the buffer member 302. The flange 301 c is brought into contact with the outer surface of the case around the opening of the mounting hole 101. Thereby, the current transformer of each phase is held in the case 1 via the current transformer attachment 3. Next, the base portion 201b of the bushing body of the bushing of each phase is press-fitted into the inner periphery of the cylindrical portion 301a of the fixture body of the current transformer attachment holding the current transformer of each phase, and the cylindrical portion 301a of the fixture body is pressed. The base portion 201b of the bushing body of each phase bushing is fitted to the inner periphery. Thereafter, the stud bolt 7 is fitted into the bolt insertion hole provided in the inner flange portion 502 of the flange fixing bracket 5, the nut 8 is screwed into the stud bolt 7 penetrating the inner flange portion 502, and the nut is attached. The bushing flange 201c is tightened to the case 1 by tightening.

  As described above, the cylindrical portion 301a provided in a state of passing through the bushing mounting hole 101 together with the base portion 201b of the bushing main body 201, the first flange 301b formed at one end and the other end in the axial direction of the cylindrical portion, Current is transferred by a fixture main body 301 having a second flange 301c and a buffer member 302 made of an insulating material having elasticity such as rubber and surrounding the cylindrical portion 301a of the fixture main body 301. One end of the current transformers 4u to 4w in the axial direction of the current transformers 4u to 4w held on the outer periphery of the cylindrical portion 301a of the fixture main body is brought into contact with the first flange 301b in the case, and the second The flange 301c is sandwiched between the case 1 and the flange 201c of the bushing body of the bushings 2u to 2w outside the case 1, and the buffer member 302 is removed. If it arrange | positions in the compressed state between the other end of the axial direction of the current transformer currently hold | maintained on the outer periphery of the cylindrical part 301a of the instrument main body 301, and the case, the thickness of the buffer member 302 will be an appropriate magnitude | size. Since the current transformers 4u to 4w can be fixed so as not to move, the current transformer can be reliably prevented from being displaced in the axial direction and the circumferential direction. Accordingly, when vibration is applied from the outside, the lead wire 400 led out from each current transformer is disconnected due to the displacement of the current transformers 4u to 4w, or the current transformer hits the case 1 to cause the current transformer. It is possible to prevent the shock from being applied to the. In addition, since the vibration and impact transmitted to the current transformer can be absorbed by both the fixture body 301 and the buffer member 302 having elasticity, the characteristics of the current transformers 4u to 4w are caused by vibration and impact given from the outside. Can be prevented from changing.

  Further, since the buffer member 302 is made of a material having elasticity such as rubber, after the current transformer of each phase is held in the cylindrical portion 301a of the fixture main body 301, the second flange 301c of the fixture main body. In a state where the second flange is deformed so as to reduce the diameter, the second flange 301c is engaged with the bushing mounting hole 101 of the case while compressing the buffer member 302 in the axial direction (thickness direction). The second flange 301c through which the bushing mounting hole is passed is brought into contact with the outer surface of the case, and the cylindrical portion 301a is fitted to the inner periphery of the bushing mounting hole so that the current transformer can be easily attached to the case. Can do.

  Further, as described above, the entire first flange 301b of the fixture main body 301 disposed in the case is solidly formed (without forming a hole), and the diameter of the first flange is set outside the current transformer. By setting it larger than the diameter, it is possible to prevent the occurrence of a portion where the creeping insulation distance between the current transformer and the charged part is shortened, and to improve the insulation performance of the current transformer. The risk of lowering can be eliminated.

  The outer diameter of the first flange 301b of the fixture main body 301 is between the one end in the axial direction of the current transformers 4u to 4w and the portion exposed from the base 201b of the bushing main body of the center conductor 202 (charging part). The creepage distance is set to a size necessary to obtain a sufficient length necessary for obtaining the required dielectric strength.

  In the present embodiment, a portion for locking the lead wire 400 led out from the current transformer is not provided on the flange of the current transformer fitting 3, but the current transformers 4 u to 4 w are provided by the current transformer fitting 3. Since it is held so as not to be displaced in the axial direction and the circumferential direction, it does not cause any trouble even if the lead wires led out from the current transformers 4u to 4w are not locked. When the lead wire 400 led out from the current transformer is locked to the locking portion provided on the flange of the current transformer mounting tool 3, the current transformers 4u to 4w should be displaced in the circumferential direction. In this case, it is preferable that the lead wire 400 of the current transformer is not locked to the flange 301b because tension may be applied to the lead wire 400.

5A, 5B, and 6 show an example of a reference configuration of the present invention. In the first embodiment shown in FIG. 1 to FIG. 4, the buffer member 302 is configured separately from the fixture main body 301. However, in this reference configuration example , the buffer member 302 is a fixture for a current transformer fixture. It is formed so as to surround the cylindrical portion 301a of the main body, and is formed integrally with the cylindrical portion 301a. The other points are the same as in the first embodiment. In this case, it is preferable to integrally mold the fixture main body 301 and the buffer member 302 with the same rubber material, but they can be molded with separate members. When the fixture main body 301 and the buffer member 302 are integrally formed, the distance between the first flange 301b and the buffer member 302 is suitable for holding the current transformers 4u to 4w so as not to move therebetween. (The size smaller than the dimension of the current transformer in the axial direction by the compression allowance of the buffer member). The distance between the buffer member 302 and the second flange 301c is set to be approximately equal to the thickness of the side wall portion 100 of the case or slightly smaller than the thickness of the side wall portion 100 of the case. The peripheral part of the bushing mounting hole 101 of the case can be inserted between the first flange 301c and the second flange 301c.

  As described above, when the buffer member 302 is formed integrally with the fixture main body 301, the current transformer fixture can be manufactured by one molding, and thus the manufacture of the current transformer fixture is simplified. be able to. Further, since the number of parts is reduced, it is possible to easily manage the parts in the assembly process of the high-voltage electrical equipment.

7A, 7B, and 8 show a second embodiment of the present invention. In the present embodiment, as shown in FIG. 6, the first flange 301b of the fixture main body 301 includes a flange main body 301b1 having a plate surface perpendicular to the axial direction of the cylindrical portion 301a and an outer peripheral portion of the flange main body. 2 is formed in a cup shape integrally projecting to the flange 301c side and a peripheral wall portion 301b2 surrounding at least a part of the outer periphery of the current transformer fitted to the outer periphery of the cylindrical portion 301a. A current transformer attachment is constituted by the attachment main body 301 and an annular cushioning member similar to that shown in FIG. Other points are the same as those of the first embodiment shown in FIGS.

  Thus, if the surrounding wall part 301b2 is provided in the 1st flange 301b of the fixture main body 301, the creeping insulation distance between a current transformer and a charging part can be made longer than 1st Embodiment. Therefore, the insulation performance of the current transformer can be improved.

FIG. 9 is a perspective view showing an attachment main body of a current transformer attachment used in the third embodiment of the present invention. In this embodiment, the 1st flange 301b of the fixture main body 301 of the current transformer fixture 3 is provided so that the three-phase cylindrical part 301a may be mutually connected, The outline shape is an ellipse shape. It is formed to present. As in the first embodiment, the fixture main body 301 is made of a flexible insulating material, and the entire first flange 301b is formed solid, and the outer periphery of the first flange 301b is a current-transformation. The dimension of the first flange 301b is set so as to be disposed outside the outer periphery of the vessel. As shown in FIG. 4, the buffer member 302 formed in an annular shape as shown in FIG. 4 is fitted into the cylindrical portion 301 a of each phase, and the current transformer mounting tool is configured by the mounting tool body 301 and the buffer member 302.

  Also when the fixture main body 301 is configured as shown in FIG. 9, the buffer member 302 can be formed integrally with the cylindrical portion 301a of each phase. Similarly to the one shown in FIG. 8, the first flange 301b of the fixture main body 301 is separated from the flange main body having a plate surface orthogonal to the axial direction of the cylindrical portion 301a of each phase and the outer peripheral portion of the flange main body. It is possible to form a cup-like shape integrally including a peripheral wall portion that protrudes toward the flange side of 2 and surrounds at least a part of the outer periphery of the current transformer that is fitted to the outer periphery of the cylindrical portion.

10 to 12 show a fourth embodiment of the present invention. In this embodiment, the present invention is applied to a high-voltage electric device in which a through-type zero-phase current transformer 10 is attached to three-phase bushings 2u to 2w. The through-type zero-phase current transformer 10 is formed so as to collectively surround the base portion 201b of the bushing body 201 of the three-phase bushings 2u to 2w, and detects the zero-phase portion of the three-phase alternating current. In the present embodiment, since the three-phase bushings are arranged side by side in the horizontal direction, the through-type zero-phase current transformer 10 is formed to have an oval contour as shown in FIG. From the zero-phase current transformer 10, a lead wire 11 is drawn out for taking out its output.

  The zero-phase current transformer 10 has a base portion 201b of the bushing body of the three-phase bushings 2u to 2w in the case 1 in a lump with one end in the axial direction facing away from the bushing main portion 201a of each phase bushing. It arrange | positions so that it may surround, and is attached to bushings 2u-2w via the current transformer attachment 3. FIG.

  The current transformer attachment 3 includes an attachment main body 301 and a buffer member 302 fitted to each of the three-phase cylindrical portions of the attachment main body 301. The fitting body 301 is provided in a state of passing through the bushing attachment hole 101 of each phase together with the base portion 201b of the bushing body 201 of each phase bushing, and the inner peripheral portion is arranged on the outer periphery of the base portion 201b of the bushing body of each phase bushing. A cylindrical part 301a that holds the zero-phase current transformer 10 with the outer peripheral part inscribed in the inner peripheral part of the zero-phase current transformer 10 and the axis of the cylindrical part 301a disposed inside the case 1 A first flange 301b formed at one end in the direction and in contact with one end in the axial direction of the zero-phase current transformer 10, and formed at the other end in the axial direction of the cylindrical portion 301a disposed outside the case 1. And a second flange 301c sandwiched between the outer surface of the case 1 and the flange portion 201c of the bushing body 201 of the bushing of each phase. Similarly to the one shown in FIG. 9, the first flange 301b is provided so as to connect the three-phase cylindrical portions 301a respectively fitted to the base portions 201b of the bushing main bodies of the three-phase bushings 2u to 2w. It has been. The fixture body 301 is made of a flexible insulating material such as rubber, and the entire first flange 301b is solid, and the outer periphery of the first flange is outside the outer periphery of the current transformer 10. The dimension of the first flange 301b is set so as to be disposed at the same position. The buffer member 302 is made of an insulating material having elasticity like the one shown in FIG. 4 and is compressed between the other end in the axial direction of the zero-phase current transformer 10 and the inner surface of the case 1. Is arranged in. The configuration of the bushing of each phase and the method of attaching the bushing are the same as in the other embodiments.

Also in the present embodiment , similarly to the one shown in FIG. 8, the first flange 301b of the fixture main body 301 includes a flange main body having a plate surface orthogonal to the axial direction of the cylindrical portion 301a of each phase, and the flange main body. It is possible to form a cup-like shape integrally including a peripheral wall portion that protrudes from the outer peripheral portion of the current transformer to the second flange side and surrounds at least a part of the outer periphery of the current transformer fitted to the outer periphery of the cylindrical portion.

  In the embodiment shown in FIG. 10 to FIG. 12, the first flange formed to connect the three-phase cylindrical portions as the fixture main body of the current transformer fixture as shown in FIG. However, as in the first embodiment, the first flange 301b of the fixture body 301 may be provided for each phase.

  In each of the above embodiments, the three-phase bushings are arranged so as to be aligned in a row in the horizontal direction, but the present invention can also be applied to a case where the three-phase bushings are arranged in a triangle. When the three-phase bushings are arranged in a triangle, the first flange of the fixture main body shown in FIG. 9 is formed so that the contour shape is substantially triangular.

  In each of the above-described embodiments, the present invention is applied to a three-phase high-voltage electric device, but the present invention can of course be applied to a single-phase high-voltage electric device.

It is the front view which showed the principal part of 1st Embodiment of the high voltage | pressure electric equipment concerning this invention. (A) is the side view which showed the case of the 1-phase bushing vicinity of the same embodiment in the cross section of the case. FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG. It is a perspective view of the fixture main body used by this embodiment. It is the perspective view which showed the shock absorbing member which comprises a current transformer attachment with an attachment part main body in this embodiment. (A) is the side view and sectional drawing which showed the case of the cross section of the case of the 1-phase bushing vicinity of the reference structural example of the high voltage | pressure electrical equipment concerning this invention. (B) is a cross-sectional view of FIG. (A) taken along the plane including the central axis of the bushing. It is a perspective view of the fixture main body used by the reference structural example of FIG. (A) is the side view and sectional drawing which showed the case of the cross section of the case of the 1 phase bushing vicinity of 2nd Embodiment of the high voltage | pressure electrical appliance concerning this invention. (B) is a cross-sectional view of FIG. (A) taken along a plane including the central axis of the bushing. It is a perspective view of the fixture main body used in 3rd Embodiment of the high voltage | pressure electrical equipment concerning this invention. It is a perspective view of the fixture main body used in 4th Embodiment of the high voltage | pressure electric equipment concerning this invention. It is the front view which showed the principal part of 5th Embodiment of the high voltage | pressure electric equipment concerning this invention. FIG. 3 is a front view schematically showing the shape of a zero-phase current transformer attached to a bushing in the present embodiment. FIG. 3 is a cross-sectional view of a single-phase bushing of the present embodiment and a zero-phase current transformer attached to the bushing via a current transformer attachment along a plane including the central axis of the bushing.

DESCRIPTION OF SYMBOLS 1 Case of electrical equipment 100 Side wall part 101 Bushing attachment hole 2u-2w Current transformer 201 Bushing main body 201a Bushing main part 201b Bushing base 201c Bushing collar 202 Central conductor 3 Current transformer attachment 301 Attachment tool main body 301a Cylindrical part 301b 1st flange 301c 2nd flange 302 Buffer member 4u-4w Current transformer 10 Zero phase current transformer

Claims (5)

A case having a bushing mounting hole and containing an electric device main body therein, a bushing main portion and a cylindrical base portion aligned in the axial direction are integrally formed, and a flange portion is integrally formed at an end portion on the base portion side of the bushing main portion. The base portion is inserted into the case through the bushing mounting hole, and the bushing main portion and the flange portion are disposed outside the case, and the bushing main body extends in the axial direction. A bushing provided in a state and having a central conductor connected to an electric device main body in the case, the flange portion of the bushing body being fixed to the case by a flange fixing bracket, and one end in an axial direction of the bushing It was arranged to surround the base of the bushing body in the case toward the opposite side to the main part, and was attached to the bushing by a current transformer fitting In high voltage electrical apparatus having a through-type current transformer,
The current transformer fitting is
It is provided in a state of passing through the bushing mounting hole together with the base part of the bushing body, and the outer peripheral part of the base part of the bushing body is fitted to the inner peripheral part and the outer peripheral part is fitted to the inner peripheral part of the current transformer. A first flange formed at one end in the axial direction of the cylindrical portion disposed inside the case and the cylindrical portion disposed inside the case, and abutted against one end in the axial direction of the current transformer And a second flange formed integrally at the other end in the axial direction of the cylindrical portion disposed outside the case and sandwiched between the outer surface of the case and the flange portion of the bushing body The tool body,
The insulating material having elasticity is formed so as to surround the cylindrical portion of the current transformer fitting, and is fitted to the cylindrical portion, and is composed of an annular member separate from the fitting main body, A buffer member disposed in a compressed state between the other end in the axial direction of the current transformer and the inner surface of the case;
With
The fixture body is made of a flexible insulating material, and the entire first flange is solidly formed,
The dimension of the first flange is set so that the outer peripheral edge of the first flange is disposed outside the outer periphery of the current transformer,
The outer diameter of the buffer member is set larger than the outer diameter of the current transformer,
The thickness of the buffer member is set so that the current transformer is fixed in the axial direction and the circumferential direction by the buffer member arranged in a compressed state,
High-voltage electrical equipment characterized by A case that has a three-phase bushing mounting hole and accommodates a three-phase electrical device main body, and a bushing main portion and a cylindrical base portion that are aligned in the axial direction, and an end portion on the base side of the bushing main portion A bushing main body having a flange portion integrally formed therein, the base portion penetrating through the bushing mounting hole of each phase and being inserted into the case, and the bushing main portion and the flange portion being disposed outside the case, and the bushing A center conductor provided in a state of passing through the body in the axial direction and connected to the electric device main body in the case, and a flange portion of the bushing main body fixed to the case by a hook fixing bracket The bushing and one end in the axial direction are arranged to surround the base of the bushing body in the case with the bushing of each phase facing the bushing main part of the bushing body. In that and high voltage electrical apparatus having a through-type current transformer of each phase mounted to the phases of the bushing by each phase current transformer fitting,
The current transformer fitting is
The bushing body of each phase is provided in a state of passing through the bushing mounting hole of each phase together with the base of the bushing body of each phase, and the inner periphery is fitted to the outer periphery of the base of the bushing body of each phase bushing and the outer periphery is A cylindrical portion that is fitted to the inner periphery of a phase current transformer and holds the current transformer of each phase, and is formed at one end in the axial direction of the cylindrical portion that is disposed inside the case. A first flange abutted on one end of the current transformer in the axial direction and an outer surface of the case and the bushing of each phase formed at the other end in the axial direction of the cylindrical portion disposed outside the case A fixture body integrally having a second flange sandwiched between the bushing body of the bushing body;
It is formed of a resilient insulating material so as to surround the cylindrical portion of the current transformer fitting, and is made of an annular member separate from the fitting main body fitted to the cylindrical portion. A buffer member disposed in a compressed state between the other end in the axial direction of the flow device and the inner surface of the case;
With
The fixture body of the current transformer fixture is made of a flexible insulating material, and the entire first flange is solidly formed,
The dimension of the first flange is set so that the outer peripheral edge of the first flange is disposed outside the outer periphery of the current transformer,
The outer diameter of the buffer member is set larger than the outer diameter of the current transformer,
The thickness of the buffer member is set so that the current transformer is fixed in the axial direction and the circumferential direction by the buffer member arranged in a compressed state,
High-voltage electrical equipment characterized by A case that has a three-phase bushing mounting hole and accommodates a three-phase electrical device main body, and a bushing main portion and a cylindrical base portion that are aligned in the axial direction, and an end portion on the base side of the bushing main portion A bushing main body having a flange portion integrally formed therein, the base portion penetrating through the bushing mounting hole of each phase and being inserted into the case, and the bushing main portion and the flange portion being disposed outside the case, and the bushing A center conductor provided in a state of passing through the body in the axial direction and connected to the electric device main body in the case, and a flange portion of the bushing main body fixed to the case by a hook fixing bracket The bushing and the base of the bushing body of the three-phase bushing are collectively enclosed in the case with one end in the axial direction facing away from the bushing main part of the bushing of each phase. In high voltage electrical apparatus having a current transformer fitting the three-phase bushing was transmembrane zero-phase current transformer attached to being,
The current transformer fitting is
The bushing body of each phase is provided in a state of passing through the bushing mounting hole of each phase together with the base of the bushing body, and the inner periphery is fitted to the outer periphery of the base of the bushing body of each phase bushing, and the outer periphery is the zero phase. The zero-phase current transformer is formed at one end in the axial direction of the cylindrical portion that is inscribed in the inner peripheral portion of the current transformer and holds the zero-phase current transformer and the cylindrical portion that is disposed inside the case. A first flange that is in contact with one end in the axial direction of the cylindrical portion and the other end in the axial direction of the cylindrical portion that is disposed outside the case. A fixture main body integrally having a second flange sandwiched between the flange portion;
The zero-phase change is formed of an annular member that is formed so as to surround the cylindrical portion of the fixture main body by an insulating material having elasticity and is separated from the fixture main body fitted into the cylindrical portion. A buffer member disposed in a compressed state between the other end in the axial direction of the flow device and the inner surface of the case;
With
The fixture body of the current transformer fixture is made of a flexible insulating material, and the entire first flange is solidly formed,
The dimension of the first flange is set so that the outer peripheral edge of the first flange is disposed outside the outer periphery of the current transformer ,
The thickness of the buffer member is set so that the current transformer is fixed in the axial direction and the circumferential direction by the buffer member arranged in a compressed state,
High-voltage electrical equipment characterized by   4. The high-voltage electrical apparatus according to claim 2, wherein the first flange of the attachment body of the current transformer attachment is provided so as to connect the three-phase cylindrical portions to each other. The first flange of the current transformer fixture includes a flange main body having a plate surface orthogonal to the axial direction of the cylindrical portion, and an outer periphery of the cylindrical portion protruding from the outer peripheral portion of the flange main body toward the second flange. Is formed in a cup-like shape integrally having a peripheral wall portion surrounding at least a part of the outer periphery of the current transformer fitted to
The high-voltage electrical apparatus according to claim 1, 2, 3, or 4.

Images