JPS5949659B2 - Arc-resistant insulating rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the arc resistance of insulating spacers for power transmission line conductors and insulating materials for transmission line towers that are installed between lines of power transmission lines for the purpose of preventing snow damage and preventing shaking. The present invention relates to a method for manufacturing an arc-resistant insulating rod.

Conventionally, insulating rods used for this type of purpose use a reinforced plastic (FRP) pipe made of a combination of glass fiber and thermosetting resin such as polyester or epoxy as a strength support, and the surface of the insulating rod is made of reinforced plastic (FRP) made of a combination of glass fiber and thermosetting resin such as polyester or epoxy. For the purpose of improving properties, a thick arc-resistant layer made of a thermosetting resin such as polyester or epoxy mixed with quartz, charcoal, alumina, aluminum hydroxide, etc. was used.

Figure 1 shows a conventionally used arc-resistant insulating rod. 1 is a reinforced plastic (hereinafter referred to as FRP) pipe made of a combination of thermosetting resin such as epoxy or polyester and glass fiber, which plays the role of strength support. accomplish

Reference numeral 2 denotes an arc-resistant layer having the composition described above, which is thickly formed on the surface of the FRP pipe.

3 is a terminal fitting which is usually connected to ΠΨ by screw connection.

4 is the core material, which is mainly made of hard urethane foam.

This type of conventional insulating rod uses an organic material as a binder in the arc-resistant layer on the surface, so if it is exposed outdoors for a long time, it will deteriorate due to ultraviolet rays, wind, rain, sand and dust, etc., and the surface will gradually become rough and cause flash. Voltage drops.

This trend is particularly pronounced in areas with high levels of air pollution.

The present invention improves the drawbacks of the conventional products and provides an insulating rod with good arc resistance, weather resistance, and stain resistance. 2 and 3 are cross-sectional views of arc-resistant insulating rods obtained by the method of the present invention, in which 5 is an inorganic insulating material such as a quartz tube, a glass tube, a porcelain tube, etc., 6 is an epoxy, polyester, acrylic, Insulating materials such as urethane and rubber, or insulating materials T containing fillers such as quartz powder, charcoal, alumina, and aluminum hydroxide, include glass fibers, vinylon fibers, nylon fibers, aramid fibers, etc. An FRP frugal support member made of a combination of reinforcing fibers and thermosetting resins such as polyester and epoxy.

8 is a thermosetting resin cast product such as epoxy or polyester;
Alternatively, a cast product in which powder of quartz powder, charcoal, alumina, aluminum hydroxide, etc. is filled into these resins is used.

9 is a terminal metal fitting which has a reverse taper and is attached to the FRP strength support member.

The manufacturing method according to the present invention will be described below. An uncured liquid resin composition made by mixing fillers such as quartz powder and aluminum hydroxide powder into a thermosetting resin such as polyester or epoxy is injected into the pipe made of inorganic insulating material in step 5, and both ends are sealed. The liquid resin composition is sealed and slowly rotated using a rotary machine having a rotation mechanism to adhere the liquid resin composition to the inner wall of the pipe to a uniform thickness, and the rotation is continued until the resin is gelled by heating from the outside.

Of course, if the resin composition gels at room temperature, there is no need to heat it. After gelation, take it out of the rotary machine and let the resin harden. According to this method, the thermosetting resin adheres to the inner surface of the inorganic tube with a uniform thickness, and since rotational hardening is performed, the filler with a heavy specific gravity is oriented toward the surface of the inorganic tube due to centrifugal force, and air bubbles are formed on the inner surface of the inorganic tube. A resin layer with good electrical properties can be formed without leaving any residue inside.

In this way, a uniform layer of thermosetting resin is provided on the inner surface of the inorganic tube 6, which completely adheres to the inorganic material, which not only strengthens the inorganic material and makes it tough, but also prevents the inorganic material from being damaged by external force. Because the resin is strongly bonded, the inorganic material will not be damaged and scattered. 8
For this purpose, a cast product made of thermosetting resin such as epoxy 1 or polyester and molded into a cylindrical shape in advance is used.

A glass cloth is rolled around the surface of this core material to a required thickness, and the core material is placed in the resin-lined inorganic tube. When manufacturing an insulating rod with metal fittings attached to both ends, fix the metal fittings and the core material, wrap the glass cloth over the metal fittings when rolling it, and secure it by tightening it with glass roping from above. This allows the metal fittings to be embedded inside the FRP. Next, caps are attached to both ends of the inorganic tube, a vacuum is drawn from one end, and a thermosetting resin such as epoxy or polyester is injected from the other end.

After the resin injection is completed, curing is performed. The product molded in this way does not contain any air bubbles, and the resin layer provided on the inner surface of the inorganic tube and the FRP layer molded later are completely bonded and integrated, resulting in extremely excellent electrical and mechanical properties. An insulating rod is obtained.

In particular, the insulating rod manufactured by this method has an inorganic surface and has excellent arc resistance and weather resistance, and can be used outdoors semi-permanently. EXAMPLE A glass tube with an outer diameter of 40 mm and a wall thickness of 2 mm was used as an inorganic tube.

Epoxy resin (EpikOte8l5) as a lining material for glass tubes...
100 hardening agent (Tomide 225)
・・・・・・18 Aluminum hydroxide・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・ 8
A liquid mixture of 0 and 0 was injected into a glass tube in an amount to give a wall thickness of 2 and 3, and was cured by rotational curing.

As the core material, a round bar made of an epoxy cast product with an outer diameter of 25 Twt0 was used.

The following resin composition was used for the core material.

Epoxy resin (EpikOte828)...
100 hardening agent (MNA) ・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・ 90 Accelerator (BDMA) ・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・ 1.0 Glass cloth (EC-181) on the surface of this core material with an outer diameter of 32wr! Roll it up until it becomes NO, place it inside a glass tube lined with the resin mixture, and attach caps to both ends.

A vacuum was drawn from one end of the cap, and a low-viscosity epoxy resin was injected from the other end. Composition of injected resin Epoxy resin (Araldite CY-183)...10
0 hardening agent (HHPA) ・・・・・・・・・・・・
・・・・・・・・・・・・100 Accelerator (BDMA
) ・・・・・・・・・・・・・・・・・・・・・・・・
- After completing the injection of 1.0, it was placed in a constant temperature bath at 120°C and heated for 8 hours to harden it.

The insulating rod thus obtained has excellent performance as described below.

In addition to the above-mentioned manufacturing process, the manufacturing method of this insulating rod includes the core material 8.
The FRP layer T is prepared in advance, and this is installed in the inorganic tube 5, caps are attached to both ends, a vacuum is drawn from one side, and the resin of the resin layer 6 is injected from the other side to harden and integrate. method is also possible.

Note that the resin layer 6 can also have a two-layer structure; in this case, the first layer is formed as a backing layer on the inner surface of the inorganic tube by the rotational hardening, and the second layer is made of pre-formed FRP.
The strength support member is attached to an inorganic tube lined with a resin, and the resin is injected into this space by the above-mentioned force method and hardened and integrated.

[Brief explanation of the drawings] Figure 1 shows a conventionally used arc-resistant insulating rod, in which 1 is reinforced plastic FRP made of a combination of thermosetting resin such as epoxy or polyester and glass fiber, and 2 is polyester. and an arc-resistant layer formed by filling a thermosetting resin such as epoxy with alumina, quartz, aluminum hydroxide, calcium carbonate, clay, etc., 3 is a terminal fitting, and 4 is a core material, which is usually made of hard urethane foam. used.

Claims (1)

[Claims] 1. A liquid resin composition consisting of a thermosetting resin and a filler is injected into the inner surface of a shell-shaped insulating material made of an inorganic insulating material such as a quartz tube, a glass tube, a porcelain tube, etc., and the shell-shaped insulating material is The liquid resin composition is uniformly solidified and integrated in a layer on the inner surface of the shell-shaped insulating material by rotation and heating to form a cylindrical shell, and a cylindrical column made of thermosetting resin is placed inside the cylindrical shell. A reinforcing base material wrapped with glass cloth is inserted into the core material, the gap between the cylindrical shell and the reinforcing base material is evacuated, a thermosetting resin such as polyester or epoxy is injected into the gap, and it is cured and integrated. A method for manufacturing an arc-resistant insulating rod characterized by: