JPS5951103B2 - Tensile insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a central tension insulator that does not separate even when the shell is cut.

As shown in Fig. 1, the conventional central tension insulator is made up of a solid porcelain insulator 1 with retaining fittings 2 glued to both ends with cement 3. Due to the destruction of the solid porcelain insulator 1 and the falling of the electric wire due to the breakage of the body, there was concern that the general public would be at risk of contact electric shock, which was considered a problem in use.

In particular, recently, electric wires have been insulated so that even if they fall, the live parts are not directly exposed, so the protection device does not operate and the battery continues to be charged, which has become a safety issue.

There is also a tension insulator that is made by integrally molding a multi-resin insulator into an FRP core, but if it becomes contaminated, it will cause tracking due to leakage current, making it unsuitable for outdoor use.
The actual situation is that it is not used in Japan.

Additionally, in order to prevent tracking, it is possible to cover the outer periphery of the FRP insulator with a porcelain insulator and attach retaining metal fittings to both ends of the porcelain insulator. Exposure is inevitable.

Therefore, due to heat cycles and the like, adhesive peeling occurs in this portion, leading to internal sparkling due to moisture infiltration from this peeled portion. In addition, if it becomes contaminated, there is a concern that tracking will occur in the partially exposed organic part of this boundary, which will gradually spread to the inside and eventually lead to internal spillover. The present invention prevents electric wires from falling without separating even if the insulator is broken due to lightning or the like, and eliminates any electrically exposed resin parts, which overcomes the drawbacks of resin-based insulators. The present invention provides a porcelain tensile insulator made of FRP fibers that is free from tracking and moisture infiltration from contact parts.

As shown in Figure 2, the FRP shaft is attached to the center 15th shaft of the porcelain central tension insulator, which has retaining fittings each having a porcelain fitting part and an FRP shaft locking part attached to both ends of the porcelain insulator. Both ends are connected to the FRP shaft connecting parts of both retaining fittings, and the gap is completely sealed with an insulating filler.
It has a structure in which the FRP shaft part is embedded and integrated inside a porcelain tensile insulator in which a porcelain part and a retaining metal fitting are bonded together.As shown in Figures 2 and 3, (1)
Porcelain insulator 1, (2) FRP shaft 4, (3
) an insulating filler 5 airtightly filled in the gap between the porcelain insulator 1 and the FRP shaft 4; and (4) a porcelain insulator fitting that fits both ends 12 of the porcelain insulator 1. This is a solid porcelain tension insulator consisting of a pair of bowl-shaped retaining fittings 10, each having an oval-shaped FRP shaft insertion {L9} that becomes wider toward the bottom as it reaches the deeper part 8 and the center of the bottom.

That is, as shown in FIG. 3, an FRP shaft 4 having longitudinal splits 6 at both ends is inserted into a porcelain insulator tube 1 with a hollow central shaft portion, and the porcelain insulator tube 1 and The space is filled with an insulating filler 5 and fixed.

In this case, the insulating filler 5 is preferably soft from the viewpoint of absorbing expansion pressure.

Next, apply the tip of the wedge 7 to the vertical split 6, and
Further, in the center of the bottom of the bowl-shaped porcelain insulator fitting part 8 that fits into the FRP shaft 4, a two-stage FRP shaft insertion hole 9 is formed, which has a circular opening and an oval shape that becomes wider toward the deeper part. The both ends 11 of the FRP shaft 4 are inserted into the FRP shaft insertion hole 9, and the both ends 12 of the porcelain insulator tube 1 are peeled off. They are each inserted into the fitting portion 8 and fixed with adhesive.

In this case, the adhesive 13 is attached to the retaining metal fitting 10 shown in FIG.
If the end 11 of the FRP shaft 4 with the wedge 7 applied is press-fitted into the FRP shaft insertion hole 9, the wedge 7 will be inserted into the FRP shaft 4 by pressing the FRP shaft 4 upward. Cut into the vertical split 6 and push it out as shown in Figure 2.
It is integrally molded in close contact with the inside of the RP shaft insertion hole 9. At the same time, the end 12 of the porcelain insulator 1 is inserted into the insulator fitting part 8 of the retaining fitting 10, the gap between the fitting part 8 and the end 12 is filled with adhesive 13, and the porcelain insulator is 1 and the retaining metal fitting 10 are glued together. In this case, the end portion 12 of the porcelain insulator tube 1 is sanded, and a retainer is provided in the insulator fitting portion 8 of the retaining fitting 10 in a ring shape as shown in FIG. By forming the mouth part into a constricted shape, the adhesion between the end part 12 and the insulator fitting part 8 is strong, the adhesion area is wide, it can withstand heat cycles etc. well, and peeling does not occur. In this case, F
If the packing 14 is fitted to the base of the end 11 of the RP shaft 4, it will act as a buffer between the end 12 of the porcelain insulator tube 1 and the bottom of the insulator fitting part 8 of the retaining fitting 10 during press-fitting. , it is possible to improve the airtightness. Similarly, a retaining fitting 10 is attached to the opposite side of the porcelain insulator 1.

As described above, the porcelain insulator tube 1 and the retaining fitting 10 are bonded together using the adhesive 13.

Note that it is easy to provide the adhesive with the required tensile strength by mixing a required amount of aggregate such as alumina into the epoxy resin or the like, if necessary. In this way, it not only has the same electrical properties as a conventional solid porcelain tension insulator, but also has electrical properties that could not be expected from a conventional solid porcelain tension insulator. In addition to providing excellent mechanical properties, resin tension insulators have strong mechanical strength, but they also have the disadvantage of not being able to be used outdoors due to tracking, and moisture from the interface between the porcelain and retaining metal fittings of resin-based porcelain insulators. Infiltration of resin parts such as FRP, the occurrence and progress of tracking from contact areas, etc.
This is a tension-resistant FRP porcelain insulator that completely prevents electrical exposure by eliminating electrical exposure, and combines the anti-tracking characteristics of a porcelain insulator with the mechanical strength characteristics of a resin insulator.

That is, in the present invention, the central axis of the porcelain insulator tube 1 has F.
An FRP shaft insertion hole 9 into which the RP shaft 4 is inserted, each end 11 of which has an oval-shaped hole that widens toward the end of a retaining fitting 10.
The end portion 12 of the porcelain insulator 1 is fixed in the insulator fitting part 8 of the retaining fitting 10, and the retaining fitting 10 is attached to the porcelain insulator 1. Since it is firmly connected by both the FRP shaft 4 and the FRP shaft 4, and the tensile strength is borne by both, the strength is greatly increased.

The resin parts such as the FRP shaft 4 and the insulating filler 5 are completely contained within the porcelain insulator 1 and the retaining fitting 10, and there are no exposed parts such as joints, unlike the conventional solid porcelain resistant material. It has exactly the same functions as the insulator in terms of appearance and electrical properties, and there is no tracking caused by dirt or the like. In addition, the fitting part 8 is deeply fitted into the end part 12 of the porcelain insulator tube 1 by the adhesive 13, and is further made double and triple airtight with the insulating filler 5 and the packing 14, so that the inside is sealed. It has the same electrical functions as solid porcelain insulators without worrying about moisture infiltration. It is. Furthermore, even if the porcelain insulator tube 1 is damaged by lightning or the like, the retaining fittings 10 at both ends are firmly connected by the FRP shaft 4 and will never separate. Furthermore, since the FRP shaft 4 alone maintains the required withstand voltage, power can be transmitted as is. That is, even if an arc discharges due to lightning or the like, the opening 15 of the insulator fitting part 8 of the retaining fitting 10 is large and only a part of it melts, and the FRP shaft insertion hole 9 generates little heat, and the FRP
The strength of the shaft 4 does not decrease due to heat. Next, in the experimental results, the tensile strength test was performed on the retaining metal fitting 10.
When used in conjunction with the P shaft 16φ, the tensile strength is about 10 tons, and it has enough strength to damage the Kotsu turbine, retaining metal fitting 10, etc. before the FRP shaft 4 breaks or comes off. Therefore, it is very effective when used as a tensile insulator.

Next, the arc resistance test results show that the structure shown in Fig. 2 has a tension of about 1t0n when the porcelain insulator tube 1 has a diameter of about 75mm, a length of about 160mm, and a center FRP shaft 4 with a diameter of 16φ. In this state, a test voltage of 6.9 kV, a test current of 8,000 A, and a conduction time of 30 cycles were applied to short-circuit discharge, but the folds of the porcelain insulator 1 were destroyed and scattered due to the arc, leaving almost only the body. , retaining metal fittings 10 on both sides, fitting portion 8 of porcelain insulator tube 1
Although the area around the mouth 15 of the fuselage was partially eroded, there was no breakage or separation, and there was no abnormality in holding the wire, and the power was retransmitted at 6.9 kV without any abnormality. .

Furthermore, a dry flashover test was conducted on the specimen with damaged pleats after the arc resistance test, and the results showed that the flashover voltage was 80kV compared to 90kV for the normal product before the test, and in the water injection flashlight test, Compared to 60 kV of the normal product, the sample product after the test had a flash voltage of 35 to 50 kV, and was in a sufficiently usable state even in the state where the folds were damaged after the arc resistance test.

Therefore, the tension insulator of the present invention is able to withstand damage caused by lightning, etc., which is at risk in conventional solid porcelain tension insulators.
This ensures that there will be no falling of electric wires due to insulator shell breakage, and is very effective in terms of preventing electric shocks.

Furthermore, even after lightning damage, power can be transmitted as is until the insulators are replaced, which is preferable from the standpoint of stable power supply.

Conventionally, there are resin tension insulators based on FRP, but since the parts equivalent to porcelain insulators are also made of resin, there is a concern that tracking may occur during use, leading to flashovers, so currently outdoor use is not possible. Not used as high voltage distribution insulators.

Furthermore, even in insulators in which the outer periphery of the FRP core is covered with porcelain insulators, some resin parts are unavoidably exposed in the leakage current path, so there is a concern that tracking may occur from this part.

On the other hand, in the case of the present invention, the resin part such as FRP is
Due to the crowning of the porcelain insulator and the retaining metal fitting, it is built deep inside the porcelain insulator and does not appear in the leakage current path either electrically or in shape, and the fitting part 8 of the retaining metal fitting 10 and the porcelain insulator are not exposed to the leakage current path. The end portion 12 of the insulator tube 1 is firmly bonded by polymerization due to a wide bonding area, sanding, and a shape to prevent it from coming off.The bond is extremely strong, and in terms of electrical characteristics and shape, it is completely made of porcelain. It is a real tension insulator, and has excellent features such as no worries about tracking and no shell breakage.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of a conventional solid tension insulator. FIG. 2 is an explanatory sectional view of the solid tension insulator of the present invention. Third
The figure is an explanatory diagram for assembling the solid tension insulator of the present invention. 1 is a porcelain insulator/porcelain insulator pipe, 2 is a stopper, 3 is cement, 4
is the FRP shaft, 5 is the insulating filler, 6 is the vertical split of the FRP shaft, 7 is the wedge, 8 is the fitting part, 9 is the FRP shaft insertion hole, 10 is the bowl-shaped retaining metal fitting, 11 is the FRP shaft 4 12 is the end of the porcelain insulator J tube 1, 13 is an adhesive, 14 is a packing,
15 is an end of the fitting part 8.

Claims (1)

[Claims] 1 (1) A porcelain insulator tube, (2) an FRP shaft inserted into the porcelain insulator tube and protruding from both ends of the porcelain insulator tube, (
3) an insulating filler airtightly filled in the gap between the porcelain insulator and the FRP shaft, and (4) a porcelain insulator fitting part into which both ends of the porcelain insulator are fitted, and the center of the bottom. Oval-shaped FRP that widens as it goes deeper.
A solid porcelain tension insulator consisting of a pair of bowl-shaped retaining fittings each having a shaft insertion hole.