JP5092532B2 - Support - Google Patents

Description

  The present invention relates to a support insulator for an insulated conductor of a mid-low capacity air-insulated switch, and more particularly to a support insulator when a main circuit conductor is an insulated conductor for the purpose of reducing switchgear.

  In recent years, the mid-low capacity air-insulated switchgear has been reduced in size, and the technology relating to the insulation reinforcement method inside the equipment has become extremely important. Since the withstand voltage in the device is proportional to the insulation distance, an increase in the withstand voltage leads to an increase in the insulation distance, that is, an increase in the size of the entire device. As a part that has the greatest influence on miniaturization, there is insulation reinforcement of the main circuit conductor, and the insulation distance is greatly reduced by covering the conductor with a polymer insulating material. The main circuit conductor is fixed with a support insulator inside the device, and the fixing method is generally tightening and fixing with a metal bolt.

  When the insulated conductor is fixed with the support insulator, the metal part 34 of the main circuit conductor 32 is fixed without applying the insulating coating 33 to the main circuit conductor 32 at the position fixed with the support insulator 31 as illustrated in FIG. A method of tightening and fixing with bolts 35 is employed (for example, the prior art of Patent Document 1).

Recently, there has been proposed a support insulator that can fix the main circuit conductor in a state where an insulation coating is applied without using a fixing means such as a bolt like the support insulator 4 illustrated in FIG. 4 (Patent Document 1). . A hole 41 for penetrating and supporting several kinds of the main circuit conductors is formed in the head 40 of the support insulator 4. The peripheral edge of the hole 41 has a shape in which a plurality of arcs 42 and 43 having different curved radii that are fitted to the end face of the main circuit conductor formed in a plate shape are connected. The main circuit conductor is supported by the insulator 4 without using a fixing means such as a bolt by passing the main circuit conductor through the hole 41 so that the end surface of the main circuit conductor fits into the arc 42 (or 43). Can be fixedly supported.
JP2000-322961

  In the conventional method of fixing by providing a portion where the insulating coating is not applied to the conductor fixing portion, it takes time to perform the coating process. Further, since this portion is a weak point in terms of insulation reinforcement, it is impossible to expect a reduction in the insulation distance. Therefore, as a method of fixing the insulator and the insulated conductor, it is necessary to fix the insulator with an insulator provided with a tightening fixing mechanism from above the insulation coating. It becomes an intermediate potential and causes a reduction in withstand voltage.

  Further, since the support insulator 4 that can fix a plurality of main circuit conductors without using fixing means has to form through holes of a plurality of types of main circuit conductors in the head 40, the processing step of the support insulator 4 becomes troublesome.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a support insulator for an insulated conductor that can simplify the coating process of the conductor and reduce the insulation distance without lowering the withstand voltage.

Accordingly, the support insulator according to claim 1 includes a support portion that supports the insulated conductor, a frame that sandwiches the insulated conductor between the support portion, and a fixing unit that fixes the frame to the support portion. Is formed with a groove for disposing the main surface of the insulated conductor in the horizontal direction and a groove for disposing the main surface in the vertical direction, and the frame and the fixing means are made of a resinous material. To do. According to the present invention, it is not necessary to insulate a portion of the insulated conductor sandwiched between the support portion and the frame, so that the insulation coating of the conductor is simplified. In addition, since the conductor is sandwiched and fixed between the support portion and the frame, it is not necessary to form a hole through which the conductor penetrates, and the processing process of the support insulator is simplified. Further, since the frame and the fixing member are made of resin, the withstand voltage is not lowered by the intermediate potential, the withstand voltage is improved, and the insulation distance is reduced.

Moreover, since the attachment direction of an insulated conductor can be changed, a more flexible insulated conductor can be supported.

The support insulator according to claim 2 is the support insulator according to claim 1 , wherein a convex portion having a cross-sectional shape of a reverse trapezoid in the width direction is formed on the upper surface of the support portion, while the convex portion is formed on the lower surface of the frame. And a groove formed in the convex portion and the concave portion. According to the present invention, the fixing strength of the insulated conductor in the vertical direction of the support insulator is enhanced, and more reliable support is possible.

The support insulator according to claim 3 is the support insulator according to claim 1 or 2 , wherein the support portion and the frame are made of biomass-derived resin. According to the present invention, since the support part and the frame are made of a resin derived from biomass, the outflow of environmental hormones is prevented even when discarded, and the increase in carbon dioxide in the ecosystem is suppressed even if incinerated. Examples of the biomass-derived resin include vegetable oil-based resins, specifically resins made of epoxidized linseed oil.

According to the above invention, the conductor coating process can be simplified and the insulation distance can be reduced without lowering the withstand voltage. In addition, the insulated conductor can be supported more flexibly.

In particular, according to the invention of claim 2, the insulated conductor can be supported more reliably. Also, the increase in carbon dioxide in the ecosystem are both incineration outflow is prevented environmental hormones be discarded according to the invention of claim 3 is suppressed.

  Fig.1 (a) is the side view which showed the support insulator based on 1st embodiment of invention. FIG.1 (b) is the side view which showed the said support insulator in the state from which the insulated conductor was removed.

  The support insulator 1 has a mechanism for fixing the insulated conductor 10 in a state where an insulating coating is applied. That is, the support insulator 1 shown in FIG. 1A includes a support portion 11 that supports the insulated conductor 10 and a frame 12 that sandwiches the insulated conductor 10 between the support portion 11. The insulated conductor 10 is entirely covered with an insulating material. The frame 12 is fixed to the support portion 11 by bolts 13 and nuts 14 as fixing means. Note that a plurality of fixing bolt inserts 15 for fixing the support insulator 1 at a predetermined position are appropriately provided at the bottom of the support portion 11.

  As shown in FIG. 1B, grooves 16 and 17 are formed on the upper surface of the head 111 of the support portion 11 and the lower surface of the frame 12 so as to sandwich and hold the insulated conductor 10. That is, the groove 16 for placing the insulated conductor 10 is formed on the upper surface of the head 110 of the support portion 11, while the groove 17 for pressing the insulated conductor 10 installed in the groove 16 is formed on the lower surface of the frame 12. Yes. The grooves 16 and 17 are formed so that the opening width thereof is substantially the same as the width of the insulated conductor 10 and the main surface of the insulated conductor 10 is disposed horizontally. Further, the inner surfaces in the long side direction of the grooves 16 and 17 have the curved surface radius set to be substantially equal to the curved surface radius of the end surface of the insulated conductor 10, so that the airtightness with the insulated conductor 10 is maintained. A groove 18 described later is formed at the bottom of the groove 16.

  The frame 12 and the fixing means (bolt 13 and nut 14) are made of a resin material. The frame 12 may be made of the same material as the support portion 11. Examples of the material include an epoxy resin. The fixing means is made of FRP (fiber reinforced plastic).

  According to the support terminal 1 described above, since it is not necessary to insulate the fixed portion of the insulated conductor 10 as in the prior art, the coating process of the insulated conductor 10 is simplified. In addition, since the insulated conductor 10 is sandwiched and fixed between the support portion 11 and the frame 12, it is not necessary to form a hole through which the insulated conductor 10 passes, and the processing step of the support insulator 1 is simplified. Since the frame 12 and the fixing means are made of a resin material, the withstand voltage is not lowered by the intermediate potential, the withstand voltage is improved, and the insulation distance is reduced.

  Further, when the vertical fixing frame 21 is used like the supporting insulator 2 shown in FIG. 2, the insulating conductor 10 is supported by the supporting portion so that the main surface of the insulating conductor 10 is arranged in either the horizontal direction or the vertical direction. 11 can be attached. In other words, in addition to the groove 16, a groove 18 is formed on the upper surface of the head portion 110 of the support portion 11 so that the main surface of the insulated conductor 10 is arranged in the vertical direction. On the other hand, grooves 22 and 23 are formed on the lower surface of the frame 21. The groove 22 is a groove for arranging the main surface of the insulated conductor 10 in the horizontal direction. The groove 23 is a groove for arranging the main surface of the insulated conductor 10 in the vertical direction. The inner surface in the long side direction of the groove 22 has a curved surface radius that is set substantially equal to the curved surface radius of the end surface of the insulated conductor 10 so that the airtightness with the insulated conductor 10 is maintained. Similarly, the bottom surfaces of the grooves 18 and 23 also have a curved surface radius that is set substantially equal to the curved surface radius of the end surface of the insulated conductor 10, so that the airtightness with the insulated conductor 10 is maintained. According to the support insulator 2 described above, since the arrangement of the main surface of the insulated conductor 10 with respect to the support portion 11 can be changed to either the horizontal direction or the vertical direction, the insulated conductor 10 can be supported more flexibly.

  In the support insulators 1 and 2, when the uneven structure is formed in the connection portion between the head 110 of the support portion 11 and the frames 12 and 21, as shown in FIG. The fixing strength of the insulating conductor 10 in the vertical direction 2 is enhanced.

  That is, in the support insulator 1 shown in FIG. 1B, a convex portion 111 having a reverse trapezoidal cross-sectional shape in the width direction is formed on the upper surface of the head portion 110 of the support portion 11. The grooves 16 and 18 in which the insulated conductor 10 is installed are formed in the convex portion 111. On the other hand, a concave portion 121 that fits with the convex portion 111 is formed on the lower surface of the frame 12. A groove 17 for pressing the insulated conductor 10 is formed in the recess 121. Similarly, in the support insulator 2 as shown in FIG. 2, a recess 211 that fits with the protrusion 111 may be formed on the lower surface of the frame 21. A groove 22 for pressing the insulated conductor 10 is formed in the recess 211.

  A method of attaching the frame 12 to the support portion 11 of the support insulator 1 will be described with reference to FIGS. 1 (a) and 1 (b). The frame 12 is slid along the longitudinal direction of the convex portion 111 in a state where the insulated conductor 10 is installed at a predetermined position (groove 16) in the head portion 110 of the support portion 11, and the bolt hole of the frame 12 and the head portion 110 are Match the bolt holes. And the insulated conductor 10 is fixed to the support part 11 because the volt | bolt 13 penetrated by these both bolt holes is fastened with the nut 14. As shown in FIG. Since the support portion 11 and the frame 12 are tightened by the bolt 13 and the nut 14 in a state where the concave portion 121 of the frame 12 is fitted to the convex portion 111 of the support portion 11, the insulating conductor 10 is fixed in the vertical direction of the support insulator 11. Strength is strengthened and the insulated conductor 10 can be supported more reliably. Note that the attachment of the frame 21 to the support portion 11 of the support insulator 2 may be performed as described above.

  By the way, bisphenol A type epoxy resin is generally used as a constituent material of resin-made supporting insulators, but this has been pointed out as a problem of environmental hormones. Therefore, the constituent material of the support portion 11 and the frames 12 and 21 of the support insulators 1 and 2 is a vegetable oil base exemplified by a resin made of epoxidized linseed oil instead of the conventionally employed bisphenol A type epoxy resin. A resin may be applied. Since the starting material of this resin is vegetable oil, the problem of environmental hormones can be cleared, and even if discarded by incineration, the plant is a raw material, so there is an advantage that it does not generate new carbon dioxide gas. . Therefore, by applying the vegetable oil base resin to the constituent material of the support part 11 and the frames 12 and 21, there is no possibility of the outflow of environmental hormones to the ecosystem, and carbon dioxide gas in the ecosystem is lost even if incinerated. Increase is suppressed.

(A) The side view which showed the support insulator which concerns on 1st embodiment of invention, (b) The side view which showed the said support insulator in the state from which the conductor was removed. The side view which showed the support insulator which concerns on 2nd embodiment of invention. The side view which showed the conventional support insulator for insulated conductors. The side view which showed the other conventional insulator support insulator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Support insulator 10 ... Insulated conductor 11 ... Support part 12, 21 ... Frame 13 ... Bolt, 14 ... Nut 15 ... Fixing bolt insert 16, 17, 18, 22, 23 ... Groove 110 ... Head 111 ... Convex Part 121, 211 ... concave part

Claims (3)

A support for supporting the insulated conductor;
A frame that sandwiches the insulated conductor with the support, and
A fixing means for fixing the frame to the support portion;
The support portion is formed with a groove for disposing the main surface of the insulated conductor in the horizontal direction and a groove for disposing the main surface in the vertical direction.
The support insulator according to claim 1, wherein the frame and the fixing means are made of a resin material . On the upper surface of the support portion, a convex portion having an inverted trapezoidal cross-sectional shape in the width direction is formed, while on the lower surface of the frame, a concave portion that fits the convex portion is formed. The support insulator according to claim 1 , wherein a groove is formed. The support insulator according to claim 1 or 2 , wherein the support portion and the frame are made of biomass-derived resin.

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