JP2009246080A - Stationary induction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stationary induction machine which is made compact and lightweight while securing an insulation distance between lead wires, and improves the yield of a silicon steel plate used for an iron core. <P>SOLUTION: A main body 2 which uses a three-phase three-leg iron core 3 formed of iron core leg portions 3a to 3c, and an upper yoke portion 4 and a lower yoke portion 5 and has wirings 6 wound around the iron core leg portions 3a to 3c is stored in a tank 1. A bushing 7 is fitted to a pocket 1A provided on a lengthwise side surface of the tank 1, and lead wires 8 led out of the respective wirings 6 are led around in the space between the main body 2 and tank 1 to be connected to the bushing 7. The three-phase three-leg iron core 3 when having a silicon steel plate, forming the iron core leg portions 3a to 3c, and a silicon steel plate, forming the upper yoke portion 4 and lower yoke portion 5, arranged in combination to be stacked does not have any projection portion at all by making the iron core leg portion 3c near a butt joining portion or a stack end surface of the upper yoke portion 4 parallel to an opposed lead wire. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a static induction device such as a transformer or a reactor, and more particularly to a static induction device in which a bushing is attached to a side surface in a longitudinal direction of a tank and connected to a lead wire from a winding.

  A static induction machine, for example, a transformer, has a transformer body consisting of an iron core and a winding disposed in a tank filled with an insulating medium, and the winding is a bushing attached to the side of the tank by a lead wire drawn out from the tank. And connected.

  In general, a transformer is composed mainly of a silicon steel plate and a steel material as an iron core, and a winding material is composed mainly of a copper material as a heavy material. By the way, the soaring prices of various materials as in recent years must be considered in order to economically manufacture transformers, and in particular, it is required to reduce the materials used and reduce the size and weight of the transformer body. .

  In order to reduce the size and weight of the transformer body, in the case of windings, the insulation distance is reduced and the insulation coating thickness is reduced, and a shield is attached to the tank inner surface and internal structure, thereby reducing loss and heating locally. We are taking measures to prevent and reduce the dimensions.

  On the other hand, in the case of a three-phase tripod iron core that is the main body of the transformer, both ends of the silicon steel plate at the center leg are cut at a 45 degree angle into a V shape, and the upper and lower yokes combined therewith Part of the silicon steel plate is cut into a V shape to form a T-shaped joint. In addition, the magnetic joining of the silicon steel plates of the other legs and the silicon steel plates of the upper and lower yokes is a frame-like butt joint obtained by cutting the silicon steel plates at 45 degrees, and ends the upper and lower yokes. It is made to project to the side from the left and right leg parts joining the parts. In the three-phase tripod core of this structure, the iron loss of the silicon steel plate of the central leg and the upper and lower yokes is made smaller than the iron loss of the silicon steel plate of the other legs and the upper and lower yokes. Thus, it is possible to have an appropriate temperature distribution without being heated economically and locally. (See Patent Document 1).

  Moreover, although it is a frame type iron core of the joint type similar to patent document 1, the edge part of a right-and-left leg part protrudes up and down of an upper part and a lower yoke part, or protrudes up and down of each yoke part. In order to prevent this, it has also been proposed to cut and configure the ends of the legs (see Patent Document 2).

  Furthermore, as an example of improving the magnetic properties of the iron core of the transformer, the joint type is similar to that of Patent Document 1, but the transformer iron core is formed by laminating the silicon steel plates of the yoke portion in a direction perpendicular to the longitudinal direction. It has also been proposed to eliminate a missing portion in the window portion and to eliminate a protruding portion at the joining corner portion of the silicon steel plate of the central leg portion and the silicon steel plate of the upper and lower yoke portions (see Patent Document 3).

JP-A-6-181129 JP 59-126619 A JP-A-55-156313

  As described above, the transformer uses the space between the tank and the main body of the transformer to draw out the lead wire drawn out from the winding wound around each leg of the iron core. Connected to the bushing provided in

  For this reason, when using an iron core like patent documents 1 and 2, the ends of the upper and lower yoke parts protrude laterally from the left and right leg parts, or the ends of the left and right leg parts are upper and lower yokes. Because the lead wire is projected above and below the part, the insulation distance of the lead wire routed to the bushing side and the part facing the projecting part on the side of the iron core and the upper part may be reduced and the insulation performance may be significantly reduced. . On the contrary, if the insulation distance of the lead wire is sufficiently secured, there is a problem that the overall size including the tank is increased correspondingly, and the transformer cannot be manufactured economically.

  In order to reduce the number of protrusions of the core leg and the yoke part, it is conceivable to reduce the size of the overlapping portion of the silicon steel plates to be laminated. The tightening force due to is insufficient, and there is a disadvantage that the reliability of the coupling of the iron core is lowered. Moreover, when cutting and using a part of silicon steel plate in order to eliminate the protrusion part of a leg part or a yoke part, not only the yield of iron core material will fall but a cutting man-hour will increase.

  Furthermore, when the iron core of the transformer as in Patent Document 3 is used, the silicon steel plate of the yoke part is displaced up and down, so when the lead wire is routed upward so as to face the yoke part, the insulation distance Since the silicon steel plate of the yoke part is displaced, the magnetic flux shifts in the stacking direction of the iron core to increase the loss, and the silicon steel plate of the yoke part that is displaced by the clamp is strengthened. In order to tighten, there was a problem that a gap material to be a metal fitting had to be inserted.

  The object of the present invention is to eliminate the protrusion facing the lead wire in the vicinity of the butt joint between the core leg and the upper yoke, thereby ensuring an insulation distance and reducing the size and weight, as well as silicon used for the iron core. An object of the present invention is to provide a static induction device capable of improving the yield of steel sheets.

  The static induction electric machine of the present invention accommodates in a tank a main body having at least two iron core legs and an iron core composed of an upper part and a lower yoke part, and a winding wound around each of the iron core legs, When the bushing is attached to the side surface in the longitudinal direction of the tank and the lead wire drawn from the winding is connected to the bushing by routing the space between the main body and the tank, the iron core forms the core leg. The silicon steel plate to be formed and the silicon steel plate forming the upper and lower yoke portions are laminated and formed in a core circle determined by magnetically joining the frame-shaped butt joint portions, and at least the most in the core circle. A substantial silicon steel sheet is characterized in that the laminated end face of the butt joint is configured to be parallel to the opposing lead wire.

  Preferably, the lead wire is routed to the bushing side through a space between the main body and the tank, and the laminated end surface of the iron core leg portion in the butt joint portion is configured to be parallel to the opposing lead wire. It is said.

  Preferably, the lead wire is routed from above the main body to the bushing side, and the laminated end surface of the upper yoke portion in the butt joint portion is configured to be parallel to the opposing lead wire.

  If configured as in the present invention, even if the space between the main body of the static induction electric appliance and the tank is utilized and the lead wire from the winding is routed to the bushing side, Because the joint end of the corner of the yoke part is parallel to the opposing lead wire and has no protrusion, it is possible to secure a sufficient insulation distance when connecting the lead wire and the bushing, The static induction device can be made economically by reducing the size and weight. Also, the silicon steel plates of the legs and yokes constituting the iron core are easy to manufacture because they do not increase the types, and the end of the silicon steel plate to be used does not need to be cut, so the yield of the iron core material There is an advantage that can be improved.

  In the static induction electric machine of the present invention, a main body having at least two core legs and an iron core composed of an upper part and a lower yoke part, and a winding wound around each core leg part is housed in a tank. A bushing is attached to the side surface in the longitudinal direction of the tank, and a lead wire drawn from the winding is connected to the bushing by drawing around a space between the main body and the tank. This iron core is formed by laminating a silicon steel plate that forms the iron core legs and a silicon steel plate that forms the upper and lower yoke portions in a core circle that is defined by magnetically joining the frame-shaped butt joints. Moreover, the silicon steel plate having at least the maximum width in the core circle is configured so that the laminated end face of the butt joint portion is parallel to the opposing lead wire.

  Hereinafter, the static induction electric machine of this invention is demonstrated using the example of the transformer shown in FIGS. FIGS. 1 to 3 show a three-phase transformer using a three-phase tripod iron core. A three-phase tripod iron core 3 and windings 6 for each phase are placed in a tank 1 filled with an insulating medium such as insulating oil. The main body 2 of the transformer which has is accommodated.

  The tank 1 is provided with a pocket 1A on the side surface in the longitudinal direction, and a bushing 7 for each phase is attached. The three-phase tripod iron core 3 which is a part of the transformer body 2 includes three-phase iron core legs 3a to 3c formed by laminating silicon steel plates in a predetermined core circle, and upper and lower yoke parts. It consists of four and five.

  Lead wires 8 are drawn out from the respective windings 6 wound around the iron core legs 3a to 3c. In addition, each lead wire 8 in the example shown in FIG. 1 includes an insulating space between the tank 1 and the contents 2, more specifically, an upper yoke 4 and a tank above the winding 6 that can secure a sufficient insulating distance. As shown in FIGS. 2 and 3, the right side surface of the iron core leg portion 3 c is raised to connect the lead wire 8 and the bushing 7.

  As is well known, the three-phase tripod iron core 3 is a so-called frame-shaped butt having good magnetic coupling between the silicon steel plate forming the iron core legs 3a to 3c and the silicon steel plate forming the upper and lower yoke portions 4, 5. Both ends in the longitudinal direction are formed at an angle of 45 degrees so that the joint portion can be configured. And in order to laminate and form in the defined core circle, several types of silicon steel plates with different widths are used.

  In the three-phase tripod iron core 3 of the present invention in which the silicon steel plate is magnetically coupled at the butt joint portion, at least the maximum width in the core circle among the silicon steel plates in the butt joint portion of the iron core leg portion 3c and the upper yoke portion 4 is obtained. The arrangement of silicon steel plates is devised. As described above, each lead wire 8 is routed rightward in the drawing to connect to the bushing 7 and rises on the right side surface of the core leg 3c. A large silicon steel plate is closest to the lead wire 8 and affects the securing of the insulation distance.

  For this reason, the laminated end surface of the core leg 3c at the upper right butt joint in the figure to which the present invention is applied is arranged by combining silicon steel plates so as to be parallel to the opposing lead wires 8, and the silicon of the core leg 3c is arranged. The upper end of the steel plate protrudes upward from the upper yoke 4 and the lamination end face facing the lead wire 8 is laminated so that no acute angle protrusion is generated.

  The arrangement of the silicon steel plates will be described more specifically with reference to FIG. The arrangement of the silicon steel plates of the iron core legs 3b is the same arrangement as known. However, the wide silicon steel plate in the vicinity of the center in the core circle of the iron core leg portion 3c is shifted upward so as to be partly protruded at the upper right portion and is butt-arranged with the silicon steel plate of the upper yoke 4. In the lower right part, the silicon steel plate of the lower yoke 5 is butt-arranged in a state where the silicon steel sheet of the lower yoke 5 partially protrudes to the right side. Further, the silicon steel plate of the iron core leg portion 3a is arranged upside down on the iron core leg portion 3c side. And the combination of these steel plate arrangements is rotated 180 degrees and laminated, and the overlapping width dimension T1 is secured at the butt joint.

  As it goes to both ends of the core circle, the laminated end surface of the iron core leg portion 3c laminating the narrow silicon steel plates is separated from the opposing lead wire 8 and the insulation distance is sufficiently secured. Can be. For this reason, as shown in FIG. 3, in the core leg portions 3a and 3c and the upper yoke 4 and the lower yoke 5 on both sides of the core circle, the narrow silicon steel plates used for these are arranged in a butt joint manner in the same manner as known. .

  Thereby, the silicon steel plates are arranged and laminated alternately so that the side surfaces of the iron core legs 3a and 3c, the upper surface of the upper yoke 4 and the lower yoke 5 lower surface-like projecting portions are produced, and in these butt joints, As the overlapping width dimension T2 larger than that in FIG. 2, a sufficient tightening force due to friction can be secured.

  When the transformer is configured using the three-phase tripod iron core 3 as described above, the laminated end face of the iron core leg portion 3c facing the lead wire 8 in the butt joint arrangement of the silicon steel plate with little increase in loss due to the magnetic flux is the protrusion portion. Since they can be formed in parallel without any influence, the insulation of the lead wires 8 is not adversely affected. Therefore, since the insulation distance of the lead wire 8 can be sufficiently secured without increasing the longitudinal dimension of the tank 1, the entire transformer can be saved without being enlarged, and can be reduced in size and weight and manufactured economically. Can do. Moreover, since the silicon steel plate of the leg part and the yoke part which comprise an iron core does not need to cut | disconnect these edge parts, it can reduce a cutting man-hour and can improve the yield of iron core material.

  The three-phase transformer using the three-phase tripod core shown in FIGS. 4 to 6 is configured to route the lead wire 8 from the winding 6 through the upper portion of the main body 2, that is, above the upper yoke 4. The bushing 7 is connected. For this reason, in the three-phase tripod iron core of the present embodiment, as shown in FIG. 5, the laminated end surface of the upper yoke portion 4 in the upper right butt joint portion in the drawing faces the lead wire 8. The arrangement of silicon steel plates is different from that in Example 1.

  The wide steel plate near the center in the core circle of the upper yoke part 4 is in a state of protruding partly toward the bushing 8 at the upper right part, and the laminated end faces of the upper yoke part 4 face each other. It is parallel to the lead wire so that no protrusion is generated.

  That is, the silicon steel plate of the upper yoke part 4 is shifted in the lateral direction and is arranged to abut against the silicon steel plate of the iron core leg part 3c, and in the lower right part, the silicon steel plate of the iron core leg part 3c is shifted by that amount. 5 is arranged in a butt connection projecting downward from the silicon steel plate, and on the left side, the iron core legs 3a and the silicon steel plates of the yokes 4, 5 are arranged upside down on the right side, and this arrangement is similar to the above. And are laminated by rotating 180 degrees. Further, the narrow silicon steel plates at both ends in the core circle are arranged and laminated in the same manner as in the above-described embodiment as shown in FIG.

  When the lead wire 8 from the winding 6 is routed above the main body 2 when the transformer is constructed, the use of such a three-phase tripod core 3 makes it possible to use the first embodiment described above. The same effect can be achieved.

  In each of the above-described embodiments, when the laminated end surface of the core leg portion 3c or the upper yoke portion 4 in the butt joint portion is parallel to the opposing lead wire 8, the silicon steel plate having the widest width in the core circle is provided. In the example below, the securing of the insulation distance of the lead wire 8 was examined, and in addition to the change of the silicon steel plate having the widest width in the core circle according to this result, the following width Silicon steel plates can also be stacked with different arrangements.

  In each of the above-described embodiments, the present invention has been described with reference to an example in which the present invention is applied to a transformer using a three-phase tripod iron core, but a transformer configured using a single-phase iron core or a three-phase five-leg iron core, and further, It is clear that the present invention can be applied to the reactor, and in this case, the same effect can be achieved.

It is a schematic cross-sectional view showing a three-phase transformer which is an embodiment of the present invention. It is a schematic longitudinal cross-sectional view shown by the AA line of FIG. It is a schematic longitudinal cross-sectional view shown by the BB line of FIG. It is a schematic cross-sectional view showing a three-phase transformer which is an embodiment of the present invention. It is a schematic longitudinal cross-sectional view shown by the AA line of FIG. It is a schematic longitudinal cross-sectional view shown by the BB line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tank, 2 ... Main body, 3 ... Three-phase tripod iron core, 3a, 3b, 3c ... Iron core leg part, 4 ... Upper yoke part, 5 ... Lower yoke part, 6 ... Winding, 7 ... Bushing, 8 ... Lead.

Claims (3)

  A main body having at least two core legs and an iron core composed of an upper part and a lower yoke part, and a winding wound around each of the iron core legs is housed in a tank, and a bushing is formed on a side surface in the longitudinal direction of the tank. In a static induction electric machine in which a lead wire drawn from the winding is routed through a space between a main body and a tank and connected to the bushing, the iron core is composed of a silicon steel plate forming an iron leg and upper and lower yokes. And a silicon steel plate forming a portion are laminated and formed in a core circle determined by magnetically coupling at a frame-shaped butt joint portion, and at least the maximum width silicon steel plate in the core circle is butt-joined. A stationary induction device characterized in that the laminated end face of the portion is configured to be parallel to the opposing lead wire.   2. The lead wire according to claim 1, wherein the lead wire is routed to the bushing side through a space between the main body and the tank, and the laminated end surface of the core leg portion in the butt joint portion is configured to be parallel to the opposing lead wire. Static induction electric machine characterized by.   2. The lead wire according to claim 1, wherein the lead wire is routed from above the main body to the bushing side so that the laminated end surface of the upper yoke portion in the butt joint portion is parallel to the opposing lead wire. Static induction machine.

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