JPH03208214A - Manufacture of lightning arrester container - Google Patents

Abstract

PURPOSE:To facilitate to cope with the polluted specifications by making a process to change an outer diameter on the cylinder side corresponding to a pollution degree of the specifications before a thermal contraction process of a tube. CONSTITUTION:A fold angle theta, when an FRP cylinder 2 having an outer diameter Dis is coated with a thermal contraction tube 1 with folds, is set at a small value of the spoiling degree of the specifications. Next, an FRP cylinder 2', having the wall thickness so as to have a larger outer diameter Dil than an outer diameter Dis, is used, or the FRO cylinder 2, having the outer diameter Dis, is coated with an auxiliary contraction tube 3 for adjusting an outer diameter. When in this way, the cylinder 2' or tube 3 is coated with tube 1 after a diameter on the side of an object to be coated is adjusted to Dil, the fold angle theta is enlarged. Provided that the angle theta is 20 deg., a lightning arrester container can resist a pollution degree of 0.12mg/cm<2>.

Description

[Detailed Description of the Invention] A. Industrial Application Field The present invention relates to containers for lightning arresters installed on top of power transmission towers to protect power transmission lines, especially glass fiber reinforced plastic (FR) containers.
This invention relates to a method for manufacturing a lightning arrester container that combines a cylinder such as P) and a pleated heat-shrinkable tube.

B. Summary of the Invention The present invention provides a method for manufacturing a lightning arrester container that combines a cylinder such as FRP and a pleated heat shrinkable tube, by providing a step of changing the outer diameter of the cylinder such as FRP according to the degree of contamination in the specification. By keeping the outer diameter and overall length constant and changing the pleat angle, it is possible to correspond to the degree of contamination specified.

C. Conventional technology Surge arresters for power transmission lines are installed at high places such as on power transmission towers, so it is required to limit the mass and limit the amount of flying objects during pressure release. Based on this idea, containers for lightning arresters for power transmission lines can be made by molding folds of rubber or plastic onto FRP insulation strips (molded containers), or by covering FRP insulation strips with pleated heat-shrinkable tubes (heat-shrinkable). type) or used.

Figure 4 shows the external appearance of a lightning arrester for power transmission lines, in which a ground terminal Bl is provided at the upper end of the container A, a line side terminal B2 is provided at the lower end, and arc guides CI and C2 are provided at both ends.
Has been installed.

By the way, since the contamination specifications of lightning arresters for power transmission lines differ depending on the area where they are installed, it is necessary to take this into consideration when manufacturing containers, and the following countermeasures have been taken.

(1) Increase in the degree of contamination of the mold container (for example, salt adhesion is 0.06u/cx”
From 0. 1 2 my/c+v2), a mold with an increased number of pleats or the overhanging dimension of the pleats is made. In this case, if compactness and light weight are important, molds for each degree of contamination are manufactured, and if commonality is desired, molds with heavy contamination are used.

However, increasing the overhang of the pleats is due to the manufacturing technology (if the pleats cannot be made thin, the overall length will increase as a result) and the need to prevent the gas from hitting the pleats during pressure release. Since the size of the release cap is unavoidable,
Generally, this is countered by increasing the number of pleats.

(2) Heat-shrinkable type A pleated heat-shrinkable tube with a certain pleat shape is shrink-fixed to an FRP cylinder that is compact and lightweight, and increases in the degree of contamination can be accommodated by increasing the number of pleats.

D Invention or Problem to be Solved However, in either case, the length of the container increases due to the increase in the degree of contamination, which prevents the standardization of parts, including the series gap, or in some cases is too long There are problems in that it is impossible to attach to a steel tower and the installation cost is high.

Therefore, the present inventor focused on the property of the pleated heat-shrinkable tube that when the outer diameter of the object to be adhered changes, the outer diameter of the pleated portion remains constant but the pleat angle changes. We thought of using it as a means to adapt to the

That is, as shown in FIGS. 5(a) and 5(b), when the outer diameter of the object to be adhered to, for example, the FRP cylinder y increases from Di+ to D i 2, the pleat angle θ of the pleated heat-shrinkable tube X changes. growing.

Further, as shown in FIG. 6, the relationship between the amount of salt adhesion (degree of contamination) and the required leakage distance changes depending on the dip angle θ.

The main purpose of the present invention is to provide a method for manufacturing a lightning arrester container that can easily meet contamination specifications and can be expected to significantly reduce costs through mass production.

E. Means and Effects for Solving the Problems The present invention provides a method for manufacturing a lightning arrester container consisting of a combination of a cylinder made of FRP or the like with a constant inner diameter and a pleated heat-shrinkable tube. The feature is that the process of changing the outer diameter is added before the heat shrinking process of the pleated heat shrink tube, and the outer diameter of the cylinder side can be changed by adjusting the wall thickness of the FRP cylinder or by attaching the ura support heat shrink tube. While keeping the outer diameter and overall length of the entire container constant, set the pleat angle to the required value.

F Example Hereinafter, the present invention will be explained in detail with reference to the drawings.

First, a pleated heat-shrinkable tube and an insulating cylinder, such as an FRP cylinder, which will become the container body are prepared. Is the outer diameter Do of the pleated part of the sapped heat shrinkable tube the outer diameter of the PRP strip that is the object to be applied? It is constant regardless of this, and the outer diameter of the FRP circle is set to Dis, which emphasizes size and weight reduction (see Fig. 1). The fold angle θ when the folded heat-shrinkable tube 1 is attached to the FRP cylinder 2 having an outer diameter Dis by heat shrinking is set to a value with a small specification contamination degree, for example, 0. Set at 5°, which corresponds to 0 6 mg 7 cm'.

Note that the lengths of both and the inner diameter of the FRP circle are determined based on the rating of the lightning arrester.

Next, when manufacturing lightning arrester containers with different specifications for contamination degrees, as shown in FIG. 2, PR. P cylinder 2
', or as shown in Figure 3, the outer diameter Dis
An auxiliary heat shrinkable tube 3 for adjusting the outer diameter is attached to the FRP strip 1 by heat shrinking.

After adjusting the outer diameter of the side to be adhered to Di (in this way), when the sagging heat-shrinkable tube I is affixed to the F'RP circle 2' or the auxiliary heat-shrinkable tube 3, the sagging angle θ becomes large as shown in Figures 2 and 3. If this angle θ is 20 degrees, the arrester container will have a contamination degree of 01'21f//cm' by adjusting the outer diameter of the object to be adhered. (See Figure 6).

In this way, by providing the process of adjusting the outer diameter of the object to be adhered before the heat shrinking process of the pleated heat shrink tube 1, the same pleated heat shrink tube can easily meet even stricter staining specifications. I can do it.

As a result, the same number of pleats, that is, the same overall length of the container, can cope with an increase in the degree of contamination according to the specifications, and the components including the pleated heat-shrinkable tube can be made common.

Note that the pleat angle should be adjusted to 15° or more. Further, as a pleated heat-shrinkable tube, for example, there is an HVTM pleated tube manufactured by Raychem Co., Ltd., and as a heat-shrinkable tube used for adjusting the outer diameter, there is an HVTM tube manufactured by the same company.

G. Effects of the Invention As described above, according to the present invention, when attaching a soaked heat-shrinkable tube to a container body, the main body side (
By adding a step of adjusting the outer diameter of the material (on the side to be adhered) by adjusting the wall thickness of the main body or adding a heat shrink tube for adjustment, the following effects are produced.

(1) A wide range of staining characteristics can be achieved by simply changing the container body, such as an FRP container, or adding a heat shrink tube, so most parts can be made common to several types of staining specifications. Therefore, parts management costs can be reduced.

(2) Since the length of the container can be made constant for several different specifications, it is possible to standardize other parts such as the external cap.

(3) By manufacturing containers in advance for several types of contamination specifications, they can be assembled in the same process, making it possible to automate assembly.

(4) The degree of freedom in design increases, making it easier to respond to mass and overall length specifications.

(5) The overall length of the arrester can be shortened by standardizing it at the most effective angle.

(6) Mass production effects will be demonstrated, and significant cost reductions can be expected.

[Brief explanation of drawings]

1 to 3 are cross-sectional views for explaining the manufacturing process of a lightning arrester container according to the method of the present invention, FIG. 4 is a front view showing the external appearance of the lightning arrester, and FIG. 5(a). (b) is a sectional view for explaining the relationship between the pleat angle of the pleated heat-shrinkable tube and the outer diameter of the object to be adhered, and FIG. 6 is a stain characteristic diagram of the lightning arrester container. 1... Heat shrink tube with pleats, 2.2'...FR
P circle, 3... Heat shrink tube for outer diameter adjustment, Do...
・Outer diameter of the folds, Dis... Outer diameter of the FRP cylinder with the utmost emphasis on miniaturization and weight reduction, Did... Outer diameter of the FRP cylinder after adjustment. Figure 1 Natsushi IflLvLYfAi5 餠ffitD Enkei L Cheng and 5 Bait interview

Claims (1)

[Claims] (1) In a method for manufacturing a lightning arrester container that is made of a combination of a cylinder such as FRP with a constant inner diameter and a pleated heat-shrinkable tube, the process of changing the outer diameter of the cylinder side according to the degree of contamination of the specifications is performed using the pleated heat-shrinkable tube. A method for manufacturing a lightning arrester container, characterized in that it is added before a heat shrinking process.