JP7431619B2 - Section insulator and section insulator cover - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Event date: December 4th to 6th, 2019 Meeting name: 26th Railway Technology Union Symposium (J-RAIL2019) Event location: National Olympic Memorial Youth Center (Center Building), Shibuya-ku, Tokyo Yoyogi Kamizonocho 3-1

The present invention relates to a section insulator that electrically insulates and connects two contact wires installed adjacent to each other in the extension direction of a tramway, and a cover for the section insulator.

For example, as shown in Patent Document 1 below, a section insulator that electrically insulates and connects two contact wires installed adjacent to each other in the extension direction of a tramway is equipped with fiber-reinforced plastic (hereinafter abbreviated as FRP). A rod-shaped body (insulating member 2 in FIG. 1 of Patent Document 1) is sometimes used. Although this FRP itself has high insulating properties, if water droplets are continuously formed on the upper surface in the extending direction due to rain or the like, there is a problem that the insulating properties of the section insulators in the extending direction deteriorate.

Therefore, in the section insulator 1 according to Patent Document 1, a pair of falling-off guiding slopes 7c, 7c are provided in the intermediate portion 7 of the insulating member 2, which slopes downward from the top in the center in the width direction toward both side surfaces 7b, 7b. is forming. In this way, raindrops falling on the falling-off guiding slope 7c of the insulating member 2 are transmitted downward along the falling-off guiding slope 7c and are difficult to remain on the insulating member 2. Therefore, water droplets are less likely to be continuously formed on the upper surface of the insulating member 2, and insulation in the extending direction can be ensured (see paragraph 0009 of Patent Document 1, FIG. 6, etc.).

JP2013-86628A

In the section insulator 1 according to Patent Document 1, although the drop-off guiding slope 7c has the effect of dropping water droplets from the top of the widthwise center of the intermediate portion 7 of the insulating member 2 to both side surfaces 7b, 7b, the length of the section insulator 1 It is not shaped to prevent water droplets from forming continuously in the horizontal direction. For this reason, for example, when there is a large amount of precipitation, water droplets falling from the top may continue in the length direction of the section insulator 1 on the side surface 7b. However, such heavy rains are rare, and there is no particular safety problem as the normal insulation is sufficiently secured. However, in order to further increase this safety, it is necessary to further improve the insulation. It is expected.

Therefore, an object of the present invention is to improve the insulation properties of a section insulator during rainy weather.

In order to solve the above problems, the present invention provides a section insulator that electrically insulates and connects two contact wires installed adjacent to each other in the extending direction of a tramway. a main body portion made of an extending insulator; and a drop-off guiding portion formed on the upper surface of the main body portion to cause water droplets to fall off in both directions in the extending direction so that the water droplets attached to the upper surface do not continue in the extending direction. The section insulator is characterized by having the following.

In this way, water droplets adhering to the upper surface of the main body of the section insulator will fall off smoothly in both directions of extension, thereby reliably preventing the formation of continuous water droplets in the direction of extension. , high insulation properties can be ensured.

In the section insulator, the falling-off guiding portion may be a protrusion or a groove extending in a direction crossing the extension direction.

In this way, the drop guiding portion can be formed in the main body portion of the section insulator by simple processing, and the effect of dropping water droplets due to the protrusions or grooves can be expected.

The section insulator may have a structure in which an inclined portion is formed on the upper surface of the main body portion so that water droplets adhering to the upper surface fall off in both directions orthogonal to the extending direction.

In this way, water droplets adhering to the top surface of the main body can be dropped in both directions of the extension direction by the drop guiding part, and also in both directions orthogonal to the extension direction by the slope part, and the water droplets on the top surface can be dropped in both directions orthogonal to the extension direction. It is possible to reliably prevent the adhesion of particles and ensure higher insulation.

In the section insulator, the falling-off guiding portion may extend from the top surface to the side surface of the main body portion.

In this way, it is possible to reliably prevent water droplets that have fallen from the upper surface of the main body from accumulating on the side surfaces of the main body, thereby preventing the insulation from being impaired.

Instead of configuring a section insulator as described above, a section insulator that electrically insulates and connects two contact wires installed adjacent to each other in the extension direction of the overhead contact line extends along the extension direction. A cover for a section insulator that is provided on a main body made of an insulator so as to cover it from above, includes a cover main body made of an insulator extending along the extension direction, and a cover main body formed on the upper surface of the cover main body, A cover for a section insulator, characterized in that it has a drop-off guiding part that causes water droplets to fall off in both directions of the extension direction so that the water droplets attached to the upper surface of the cover main body part do not continue in the extension direction on the upper surface. can also be configured.

In this way, by providing the section insulator cover so as to cover the main body of the existing section insulator, it is possible to ensure high insulation properties in the same way as when the falling-off guide part is directly formed on the main body. .

In the section insulator cover, the falling-off guiding portion may be a protrusion or a groove extending in a direction crossing the extension direction.

The section insulator cover may be configured such that an inclined portion is formed on the upper surface of the cover main body portion to cause water droplets adhering to the upper surface to fall off in both directions orthogonal to the extending direction.

In the section insulator cover, the falling-off guiding portion may extend from the top surface to the side surface of the cover main body portion.

In this invention, since the drop-off guiding portion is formed on the upper surface of the main body of the section insulator, water droplets adhering to this upper surface can be smoothly dropped in both directions of extension of the overhead contact line. Therefore, it is possible to reliably prevent water droplets from continuously forming in the extending direction, and it is possible to ensure high insulation during rainy weather. Furthermore, by covering the main body of an existing section insulator with the section insulator cover described above, it is possible to obtain the same water droplet shedding effect as when the shedding guiding portion is directly formed on the main body.

A plan view showing a first embodiment of a section insulator according to the present invention The main body of the section insulator shown in FIG. ), (e) is a cross-sectional view along line ee in (a), (f) is a cross-sectional view along line ff in (e). Diagram showing leakage current measurement results The main body of the section insulator according to the second embodiment is shown, in which (a) is a front view, (b) is a side view, (c) is a sectional view taken along line cc in (a), and (d) is (a) A cross-sectional view taken along line dd in (a), (e) a cross-sectional view taken along line ee in (a), (f) a cross-sectional view taken along line ff in (e). The cover for a section insulator according to the present invention is shown, in which (a) is a front view, (b) is a side view, (c) is a cross-sectional view taken along line cc in (a), and (d) is (a). Cross-sectional view along line dd inside

A first embodiment of a section insulator 10 (hereinafter referred to as insulator 10) according to the present invention is shown in FIG. This insulator 10 uses a main body part 11 made of an insulator to connect the ends of two contact wires T1 and T2 that are installed adjacent to each other in the extension direction of the electric railway (hereinafter referred to as the extension direction). It has the function of electrically insulating and connecting.

As shown in FIG. 2, the main body portion 11 has an inclined portion 12 having an arcuate cross section formed on the upper surface, and an intermediate portion 13 (see FIG. 2(d)) whose side and bottom surfaces are flat. This is a rod-shaped member extending in the extending direction and including fixing portions 14 (see FIG. 2(c)) having a rectangular cross section formed at both ends. This main body portion 11 is made of fiber reinforced plastic (hereinafter abbreviated as FRP). Fall-off guide portions 15 are formed in the intermediate portion 13 at predetermined intervals. Water droplets adhering to the upper surface are caused to fall off in both directions perpendicular to the extension direction by the inclined part 12, and in both directions in the extension direction by the drop guide part 15.

In this embodiment, as the falling-off guiding portion 15, a protrusion 15a that is perpendicular to the extension direction and extends from the upper surface of the intermediate portion 13 to the lower ends of both side surfaces is employed. In this way, by forming the protrusions 15a, water droplets are prevented from continuing in the extending direction of the main body 11 over the entire area from the top surface to the side surfaces of the main body 11, and the high Ensures insulation.

The height of the protrusion 15a from the surface of the intermediate portion 13 is approximately 5 mm. This height is not limited to this, and can be, for example, within a range of 1 mm or more and 20 mm, preferably within a range of 2 mm or more and 15 mm or less, and more preferably within a range of 4 mm or more and 10 mm or less. In this way, the water droplets adhering to the upper surface of the intermediate portion 13 can be prevented from being integrated due to the surface tension of the water, and the water droplets can be reliably separated in the extending direction.

In this first embodiment, the number of protrusions 15a formed in the intermediate portion 13 is set to 5 or 9, but the number can be increased or decreased as appropriate. Furthermore, in this embodiment, a water-repellent silicone varnish paint is applied to the surfaces of the intermediate portion 13 and the protrusions 15a in order to promote the falling off of water droplets, but the type of water-repellent agent may be changed as appropriate. Can be done. Alternatively, a configuration may be adopted in which no water repellent is applied.

A bolt hole 16 is formed in the fixing part 14, and a retaining part 17 for retaining the ends of the contact wires T1 and T2 is fixed thereto. The ends of the contact wires T1 and T2 are inserted into the retaining portions 17 and then fixed with bolts 18.

The main body part 11 (embodiment of the present application) in which the falling-off guide part 15 (projection ridge 15a) shown in FIG. A voltage test was conducted on the specimen that simulated rain conditions. This voltage test involves forming electrodes on both ends of a rod-shaped specimen by wrapping aluminum foil and further wrapping copper wire (the distance between the two electrodes is 1270 mm), and applying an AC commercial frequency voltage between the two electrodes. This was done by adding The voltage range was from 10 kV to 100 kV, and the leakage current was measured every 10 kV. At 100 kV, the voltage was held for 5 minutes.

Water injection into the specimen was performed based on JISC3801-1 (Insulator Test Methods Part 1), Section 7.3 (Commercial Frequency Water Injection Flashover Voltage Test). Prior to water injection, when the leakage current was measured in the above voltage range in a dry state of the specimen, it was 20 μA or less in both the example of the present application and the comparative example, indicating that there is no problem with the insulation of the specimen itself. It could be confirmed.

The results of the voltage test are shown in Figure 3. Compared to the comparative example in which no protrusions 15a were formed, in Example 1 in which five protrusions 15a were formed on the main body 11, leakage current was reduced by forming protrusions 15a in a voltage range of 90 kV or higher. I was able to confirm the effect. Furthermore, by increasing the number of protrusions 15a formed on the main body portion 11 to nine as in Example 2, it was confirmed that the leakage current was further reduced in a voltage range of 60 kV or higher. In this way, it has been experimentally revealed that as the number of protrusions 15a increases, the insulation of the insulator 10 increases, and the effect of reducing leakage current can be improved.

FIG. 4 shows a main body portion 11 of an insulator 10 according to a second embodiment of the invention. This main body part 11 is common to the main body part 11 according to the first embodiment in that drop-off guide parts 15 are formed at predetermined intervals in the intermediate part 13 to cause water droplets to fall off in both directions of extension. The difference is that the falling-off guide portion 15 is a groove portion 15b that is perpendicular to the extending direction and extends from the upper surface of the intermediate portion 13 to the lower ends of both side surfaces.

By forming the grooves 15b in this manner, water droplets are prevented from continuing in the extending direction of the main body 11 over the entire area from the top surface to the side surfaces of the main body 11, similar to when the protrusions 15a are formed. can be expected to have the effect of preventing Further, by increasing the number of grooves 15b, it is possible to expect the effect to be improved in the same way as when the protrusions 15a are formed. Also in this embodiment, a water-repellent silicone varnish paint is applied to the surfaces of the intermediate portion 13 and the groove portion 15b in order to promote the falling off of water droplets.

An embodiment of a section insulator cover 19 (hereinafter referred to as cover 19) according to the present invention is shown in FIG. This cover 19 has a cover main body part 20 and a fall guide part 15.

The cover body part 20 covers the body part 11 made of an insulator that electrically insulates and connects the ends of the two contact wires T1 and T2 installed adjacently in the extension direction. This is a member made of an insulator, which is fixed to the main body part 11 with a bolt 21, and has an inclined part 12 having an arcuate cross section on its upper surface.

This cover main body part 20 is formed with drop-off guide parts 15 at predetermined intervals for causing water droplets to fall off in both directions of the extension direction. The falling-off guide portion 15 is a protrusion 15a that extends perpendicularly to the extending direction and extends from the top surface of the cover main body portion 20 to the lower ends of both side surfaces. By forming the protrusions 15a in this manner, water droplets are prevented from continuing in the extending direction of the cover main body 20 over the entire cover main body 20 from the top surface to the side surfaces. 20 ensures high insulation properties. The number of protrusions 15a can be determined as appropriate, taking into consideration the required insulation properties.

In this embodiment, a water-repellent fluorine-based paint is applied to the surfaces of the cover main body 20 and the protrusions 15a in order to promote the falling off of water droplets. Similarly to the second embodiment, a silicone varnish paint can also be applied.

Regardless of the cross-sectional shape of the main body 11 of the existing insulator 10, this cover 19 can ensure the insulation of the main body 11 by just providing it to cover the main body 11 from above, and is versatile. Very expensive. In addition, although the aspect in which the protrusion 15a was formed in the cover main body part 20 was demonstrated above, it could also be set as the aspect in which the groove part 15b shown in said 2nd embodiment was formed.

The insulator 10 and cover 19 described above are illustrative in all respects, and modifications may be made to the above embodiment as appropriate as long as the problem of the present invention, which is to improve the insulation properties of the insulator 10 during rain, can be solved. can be added.

For example, although the insulator 10 and cover 19 described above have the sloped portion 12 having an arcuate cross section on the upper surface thereof, the sloped portion 12 may have a triangular cross section or the drop guiding portion 15 may be used to sufficiently cause water droplets to fall off. In some cases, the inclined portion 12 may not be formed and a flat surface may be formed. Further, in each of the above embodiments, the falling-off guiding portion 15 (projection 15a, groove portion 15b) is configured to be perpendicular to the extending direction, but the falling-off guiding portion 15 is It is also possible to have a configuration in which they intersect while being inclined at a predetermined angle. Further, in each of the above embodiments, a configuration is shown in which either the protrusion 15a or the groove 15b is adopted as the falling-off guiding portion 15, but a configuration in which both the protrusion 15a and the groove 15b are adopted in combination is also possible. You can also.

10 Section insulator (insulator)
11 Main body part 12 Inclined part 13 Intermediate part 14 Fixing part 15 Falling guide part 15a Projection 15b Groove part 16 Bolt hole 17 Retaining part 18 Bolt 19 Section insulator cover (cover)
20 Cover body part 21 Bolts T1, T2 Contact wire

Claims (4)

In a section insulator (10) that electrically insulates and connects two contact wires (T1, T2) installed adjacent to each other in the extension direction of the electric railway line,
a main body portion (11) made of an insulator extending along the extension direction;
A drop-off guide formed on the upper surface of the main body (11) and having a symmetrical shape in the extending direction to cause water droplets to fall off in both directions of the extending direction so that the water droplets attached to the upper surface do not continue in the extending direction. Part (15) and
has
An inclined part (12) having no slope in the extending direction is formed on the upper surface of the main body part (11) to cause water droplets attached to the upper surface to fall off in both directions perpendicular to the extending direction. ,
The main body part (11) has an intermediate part (13) whose side and bottom surfaces are planar, and the intermediate part (13) has the falling guide part (13) with the inclined part (12) therebetween. 15) are formed at predetermined intervals . The section insulator according to claim 1, wherein the falling-off guiding portion (15) is a protrusion (15a) or a groove portion (15b) extending in a direction crossing the extension direction. The section insulator according to claim 1 or 2 , wherein the falling-off guide portion (15) extends from the top surface to the side surface of the main body portion (11). Consisting of an insulator extending along the extension direction of a section insulator (10) that electrically insulates and connects two contact wires (T1, T2) installed adjacent to each other in the extension direction of the overhead contact line. In the section insulator cover (19) provided on the main body (11) so as to cover it from above,
a cover main body (20) made of an insulator and extending along the extension direction;
A water droplet is formed on the upper surface of the cover main body (20) so that water droplets attached to the upper surface of the cover main body (20) do not continue in the extending direction on this upper surface, so that water droplets fall off in both directions of the extending direction. a falling-off guiding portion (15) having a symmetrical shape in the extending direction ;
has
An inclined portion (12) having no slope in the extending direction is formed on the upper surface of the cover main body portion (20) to cause water droplets attached to the upper surface to fall off in both directions perpendicular to the extending direction. Ori,
A cover for a section insulator , characterized in that the fall guide portions (15) are formed at predetermined intervals on the cover body portion (20) with the slope portion (12) in between .

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