JP4104882B2 - Dangling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension insulator used as an insulator such as a power transmission line.
[0002]
[Prior art]
Conventionally, an insulator body having a head portion having a bottomed cylindrical shape integrally projecting from a cap portion and a central upper portion of the cap portion, a cap fitting provided on the outer periphery of the head portion via cement, and a head portion There is known a suspension insulator comprising a pin fitting provided inside with a cement.
[0003]
FIG. 3 is a view showing a configuration of an example of a conventional suspension insulator. In the suspension insulator 51 shown in FIG. 3, 52 is a cap portion composed of a plurality of ribs 53, 54 is a bottomed cylindrical head integrally projecting at the center upper portion of the cap portion 52, 55 is a cap portion 52 and A porcelain (insulator body) having a head 54, 56 a cap fitting provided outside the head 54, 57 a pin fitting provided inside the head 54, and 58 an outer peripheral surface of the head 54 and a cap fitting. 56, a cement for fixing the cap fitting 56, and 59, a cement for fixing the pin fitting 57 provided between the inner peripheral surface of the head 54 and the pin fitting 57, Reference numeral 60 denotes sand provided on the outer peripheral surface and inner peripheral surface of the head 54 at portions where the cements 58 and 59 are in contact with each other.
[0004]
In the conventional suspension insulator 51 described above, as shown in FIG. 4 as an example of an equipotential line in the conventional suspension insulator 51 as a simulation result, on the surface 61 of the cement 59 on the pin bracket 57 side and on the cap bracket 56 side. It has been found that partial discharge (corona) is likely to occur on the surface 62 of the cement 58 when used in an applied state. When corona occurs, it causes radio noise. In order to obtain such a suspension that does not generate corona, that is, does not generate radio noise, ANSI (American National Standard for Insulators) has defined a Radio-Influence Voltage test (RIV), There is a need to improve this RIV characteristic.
[0005]
As one measure for improving this RIV characteristic, the present applicant discloses a technique for expanding the cement cost on the side of the pin fitting 57 in JP-A-7-262845. In this example, a diameter-expanded surface that is enlarged toward the cap portion 52 side is formed at the opening end portion of the head 54 on the pin fitting 57 side, and a surface boundary portion of the pin-side cement 58 is formed on this diameter-expanded surface. ing. Further, as another measure, a conductive rod is provided on the entire surface or part of the insulator body 55.
[0006]
[Problems to be solved by the invention]
In the example disclosed in Japanese Patent Application Laid-Open No. 7-262845, the RIV characteristic can be improved to some extent, but the characteristic cannot be significantly improved, and the high RIV characteristic required in recent years cannot be satisfied. there were. Further, in the example in which the whole surface conductive or partially conductive surface is applied, the production cost is increased and the glaze life is limited.
[0007]
An object of the present invention is to solve the above-described problems and to provide a suspension that can improve the RIV characteristics by several steps compared to the conventional art and can be produced at low cost.
[0008]
[Means for Solving the Problems]
The suspension insulator according to the present invention includes a cap body having a head portion having a bottomed cylindrical shape integrally projecting from a cap portion and a central upper portion of the cap portion, and a cap fitting provided on the outer periphery of the head portion via cement. And a pin bracket provided on the inner side of the head via cement, exposed to the outside, exposed to the entire surface of the cement end on the pin bracket side, or exposed to the outside on the pin bracket side. The entire surface of the cement end and the entire surface of the cement end on the side of the cap bracket are suspended and assembled, and the sand is immersed in a 10 to 40% aqueous solution of calcium chloride on the surface of the cement end. A layer containing a deliquescent substance formed by coating and curing is provided.
The suspension insulator according to the present invention is provided with an insulator body having a head portion having a bottomed cylindrical shape integrally projecting from a cap portion and a central upper portion of the cap portion, and provided on the outer periphery of the head portion via cement. Pin brackets that are exposed to the outside, the entire surface of the cement end on the side of the pin bracket, or exposed to the outside, in a suspension made up of a cap bracket and a pin bracket provided inside the head via cement. When the entire cement end surface on the side and the entire cement end surface on the cap bracket side are suspended and assembled, and applied to the cement end surface and the cement end surface on the pin bracket side, the concentration is 10 to 40%. When applying a calcium chloride aqueous solution and applying it to the cement end surface on the cap fitting side as required, a layer containing a deliquescent substance formed by applying a calcium chloride aqueous solution with a concentration of 1 to 9% is provided. It is characterized in that the.
[0009]
In the present invention, in the conventional suspension insulator, the cement starts to dry when the relative humidity of the air decreases from 100%, and the volume resistivity increases by the drying, so that the air layer of the cement-porcelain (insulator body) interface By examining the fact that the electric field is high and discharge is likely to occur, and the RIV characteristics are reduced accordingly, and providing a layer containing a deliquescent material on the cement surface, drying of the cement can be prevented by its deliquescence, It has been found that stable RIV characteristics can be maintained over a long period of time. In addition, since it is easy to provide a layer containing a deliquescent material on the cement surface, the production cost of the suspension can be reduced.
[0010]
In a preferred embodiment of the invention, the deliquescent material is calcium chloride. In addition, the layer containing the deliquescent material is a layer formed by applying and curing a suspension of the deliquescent material, dipping the sand in an aqueous solution of the deliquescent material on the surface of the cement end when suspended and assembled. The aqueous solution of the deliquescent material is an aqueous calcium chloride solution having a concentration of 10 to 40%. Further, the layer containing the deliquescent material is a layer formed by applying an aqueous solution of the deliquescent material to the surface of the cement end after hanging and assembling, and the aqueous solution of the deliquescent material is applied to the cement end on the pin fitting side. When it is applied to the surface of this, it is a calcium chloride aqueous solution with a concentration of 10 to 40%. When it is applied to the surface of the cement end on the side of the cap metal fitting, it is a calcium chloride aqueous solution with a concentration of 1 to 9%. In either case, the RIV characteristics can be further improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a configuration of an example of a suspension insulator according to the present invention. In the example shown in FIG. 1, a suspension insulator 1 according to the present invention has a cap portion 3 made up of a plurality of cap ribs 2 and a bottomed cylindrical head portion 4 that protrudes integrally from the center upper portion of the cap portion 3. The main body 5 includes a cap metal fitting 7 provided on the outer periphery of the head 4 via cement 6 and a pin metal fitting 9 provided on the inner side of the head 4 via cement 8. Reference numeral 10 denotes sand provided on the outer peripheral surface and the inner peripheral surface of the head 4 at portions where the cements 6 and 8 are in contact with each other. The above configuration is the same as a conventional suspension insulator.
[0012]
The feature of the suspension insulator 1 of the present invention is that the surface 11 at the end of the cement 8 on the side of the pin fitting 9 and the surface 12 at the end of the cement 6 on the side of the cap fitting 7 are exposed to the outside. This is a point in which a layer 13 containing a substance is provided. Here, since the electric field concentration is larger on the pin fitting 9 side than on the cap fitting 7 side, even if the layer 13 containing a deliquescent substance is provided only on the surface 11 at the end of the cement 8 on the pin fitting 9 side, the present invention. Can be achieved. Here, the “deliquescent substance” refers to a solid substance that forms an aqueous solution by water vapor in the atmosphere by being exposed to an atmosphere such as air.
[0013]
As the deliquescent material forming the layer 13, calcium chloride can be suitably used. Further, the layer 13 containing the deliquescent material can be formed by various methods. As an example, the layer 13 containing the deliquescent material is applied to the surfaces 11 and 12 of the ends of the cements 8 and 6 at the time of assembling the suspension 1 by immersing sand in an aqueous solution of the deliquescent material, drying it and grinding it. It can be formed by curing. At this time, the deliquescent substance aqueous solution is preferably a calcium chloride aqueous solution having a concentration of 10 to 40%. In order to apply a pulverized product mixed with an adhesive or the like, a slurry obtained by immersing sand in an aqueous solution of a deliquescent substance and then drying and pulverizing it can be applied. In addition to this, a mixture obtained by mixing a pulverized product with an adhesive can be formed in advance, and then adhered to the surface.
[0014]
As another example, the layer 13 containing the deliquescent material can be formed by applying an aqueous solution of the deliquescent material to the surfaces 11 and 12 at the ends of the cements 8 and 6 after the suspension 1 is assembled. At this time, when the aqueous solution of the deliquescent material is applied to the surface 11 of the cement end 8 on the pin fitting 9 side, it is a calcium chloride aqueous solution having a concentration of 10 to 40%, and if necessary, the cement 6 on the cap fitting 7 side. When applying to the end surface 12, it is preferably a calcium chloride aqueous solution having a concentration of 1 to 9%. As described above, the concentration of the calcium chloride aqueous solution is changed between the pin metal fitting 9 side and the cap metal fitting 7 side, even if the same voltage is applied to both the pin metal fitting 9 side and the cap metal fitting 7 side. This is because it is necessary to apply a solution containing more deliquescent material to the pin fitting 9 side where the electrode is small to stabilize the surface state.
[0015]
In the hanging insulator 1 of the present invention having the above-described configuration, the deterioration of the RIV characteristics caused by drying and wetting of the cement surface of the insulator (fluctuation of the resistance value of the cement surface) is used to reduce the deliquescent of the introduction material. It is thought that it can be improved by preventing the surface from drying and maintaining the resistance of the cement surface within a certain level for a long time.
[0016]
Hereinafter, an actual example will be described.
The present invention is such that a layer 13 containing a deliquescent substance is provided on the entire surface 11 at the end of the cement 8 on the pin metal fitting 9 side and the surface 12 at the end of the cement 6 on the cap metal fitting 7 side exposed to the outside. A product suspension 1 and a conventional product suspension with no deliquescent material layer 13 were prepared.
[0017]
In the suspension insulator 1 of the present invention, when the sand is immersed in a 40% aqueous solution of calcium chloride on the surface 11 of the cement end 8 on the side of the pin fitting 9 and dried, and then pulverized, the cement 8 is assembled. A layer 13 containing a deliquescent substance was formed by uniformly applying and curing the entire surface 11 at the end of the layer. Further, the suspension 1 is assembled and cured on the surface 12 of the cement end 6 on the cap metal fitting 7 side, and then a 5% aqueous solution of calcium chloride is uniformly applied to the surface 12 at the end of the cement 6 with a brush and allowed to dry naturally. Thus, a layer 13 containing a deliquescent material was formed.
[0018]
RIV characteristics of the prepared suspensions of the present invention and the conventional products by leaving them in the air for 3 days, 1 week, 2 weeks, 1 month, 2 months, 3 months after assembly and curing in an applied state of 30 kV. Compared. The RIV characteristics were compared in accordance with ANSI by determining the radio noise level as an average value of 5 each, and comparing the two and comparing with the use level of 52 dB. The results are shown in FIG. From the results of FIG. 2, it can be seen that the radio noise level of the product of the present invention is lower in any state than the conventional product. In addition, it can be seen that the product of the present invention is lower than the use level of the radio noise level of 52 dB in any state, whereas the conventional product cannot clear 52 dB.
[0019]
【The invention's effect】
As is apparent from the above description, according to the present invention, since a layer containing a deliquescent substance is provided on the cement surface, it is possible to prevent drying of the cement due to the deliquescent property, and stable RIV characteristics over a long period of time. Can be maintained. In addition, since it is easy to provide a layer containing a deliquescent material on the cement surface, the production cost of the suspension can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an example of a suspension insulator according to the present invention.
FIG. 2 is a graph showing the relationship between the number of days left in the air after assembly and curing and the radio noise level in the examples.
FIG. 3 is a diagram showing a configuration of an example of a conventional suspension insulator.
FIG. 4 is a diagram showing an example of an equipotential line in a conventional suspension insulator.
[Explanation of symbols]
1 Suspension, 2 ribs, 3 caps, 4 heads, 5 insulator body, 6, 8 cement, 7 cap fitting, 9 pin fitting, 10 sand, 11, 12 surface, 13 layer containing deliquescent material

Claims (2)

A head body having a cylindrical head with a bottom that is integrally projected at the top of the cap and the central portion of the cap, a cap fitting provided on the outer periphery of the head via cement, and an inner side of the head In a suspension insulator comprising a pin fitting provided through cement, the entire surface of the cement end on the pin fitting side exposed to the outside, or the entire surface of the cement end on the pin fitting side exposed to the outside, and the cap At the time of assembling and suspending the entire cement end surface on the metal fitting side , sand was immersed in a calcium chloride aqueous solution with a concentration of 10 to 40% on the surface of the cement end, dried and pulverized and then applied and cured. Suspension insulator characterized by providing a layer containing deliquescent material. A head body having a cylindrical head with a bottom that is integrally projected at the top of the cap and the central portion of the cap, a cap fitting provided on the outer periphery of the head via cement, and an inner side of the head In a suspension insulator comprising a pin fitting provided through cement, the entire surface of the cement end on the pin fitting side exposed to the outside, or the entire surface of the cement end on the pin fitting side exposed to the outside, and the cap After hanging and assembling the entire cement end surface on the metal fitting side, apply it to the cement end surface on the pin metal fitting side, and apply a 10-40% calcium chloride aqueous solution to the cement end surface. when applied to the surface of the cement end of the cap fitting side according the There are suspended, characterized in that a layer containing a deliquescent material formed by coating a concentration 1-9% calcium chloride aqueous solution .

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