KR100219729B1 - Outdoor Epoxy Casting Resin Suspension Insulator - Google Patents

Abstract

The present invention is produced by the epoxy resin of the distribution suspension insulator installed on the high-voltage distribution line by epoxy resin to reduce the transport, installation, maintenance / maintenance costs and to minimize the distribution line accidents to obtain a smooth power supply epoxy casting Suspension insulator for resin distribution and its molding method. Conventional distribution suspension insulators are mostly made of magnetic materials, and due to the characteristics of the material, manufacturing difficulties (such as shape constraints, problems of interface bonding between magnetic and metal parts), environmental pollution There are many problems in transportation, installation, maintenance, life, etc. due to weakness, weakness to impact and heavy weight.

In the present invention, the material is very light and durable, Cyclo aliphatic epoxy (CYCLOALIPHATIC EPOXY) using the molding of the insulator but prevents short-circuit phenomenon between the wing and the wing during rainfall or snowfall, increase the fouling resistance and surface leakage The present invention relates to an alternating suspension suspension for epoxy casting resin of alternating type having alternating wings of large and small outer diameters to sufficiently secure a distance, and a molding method thereof.

Description

Suspension insulator for epoxy casting resin distribution and molding method {Outdoor Epoxy Casting Resin Suspension Insulator}

The present invention relates to a suspension insulator for distribution is installed on a high-voltage distribution line, more specifically, produced by the epoxy resin to reduce the transport, installation, maintenance / maintenance costs and smooth power supply through minimizing distribution line accidents The present invention relates to a suspension insulator for distribution of epoxy casting resin, and a molding method thereof.

Conventionally, the distribution suspension insulators used in the past are mostly made of magnetic materials, and due to the characteristics of the material, manufacturing difficulties (constraints on shape, interfacial adhesion problems between the magnetic part and the metal part), weakness to environmental pollution, weak point to impact, and heavy weight There are many problems in transportation, installation, maintenance, and life due to the point.

In order to improve the above problems, the present invention uses a cyclo-epoxy epoxy (CYCLOALIPHATIC EPOXY), which is a very light and durable insulation material, but prevents short circuit between wings and wings during rainfall or snowfall. The purpose of the present invention is to provide an alternating-type suspension insulator for epoxy casting resin with alternating wings having large and small outer diameters in order to increase the fouling resistance and to sufficiently secure the surface leakage distance.

1 is a process chart showing a manufacturing process of the present invention.

Figure 2 shows the shape of the suspension insulator according to the present invention,

(A) is a perspective view and (b) is a sectional view.

3 is a perspective view of a mold body for molding a suspension insulator according to the present invention.

Figure 4 is composed of a plurality of assembling the suspension insulator according to the present invention a is a cross-sectional view showing the internal structure of the mold body, b is a planar internal structure diagram.

5 is a cross-sectional view taken along the line A-A of Figure 4 of the present invention.

* Explanation of symbols for main parts of the drawings

10: suspension hanger 11: wings

12: body 13: insert

14: eye bolt 15: shackle

The characteristics of the present invention for achieving the above object is a raw material pretreatment step of first measuring the resin and the curing agent at room temperature and then preheating each to 60 ° C. and then stirring for 40 minutes in a mixing tank to degassing the vacuum at 3 mbars or less; A preheating step of applying a release agent to the mold inner surface to prevent foreign substances such as oil components from being inserted into the insert surface and preheating the mold and the insert to about 160 ° C; An injection step of installing the preheated mold in an automatic pressure gelation (APG) machine, connecting the mixing tank and the pressure hose, and injecting the raw material under a pressure of 0.3 kg / cm 2 to 2 kg / cm 2; Casting process; Release process; After finishing work process, it is produced by post-curing process at 130 ℃ for 8 hours.

The mold used in the present invention has a multi-stage layered structure of several pieces, and the gap between the layers is 0.1 μm or less, so that only air is degassed through the gap so that there are no bubbles in the molding.

In addition, the mold is mounted on the APG machine during the preheating process of the mold, and then the temperature sensor of the heating plate is adjusted to the upper part 155 ° C, the middle part 153 ° C, and the lower part 150 ° C so that the curing sequence is sequentially cured from the upper part.

The insulator produced by the present invention is an symmetrical overall and an epoxy insulating portion consisting of a wing portion and a body portion integrally; Inserts are inserted into both ends of the epoxy insulation portion, and screwed to the insert, the eye bolt is coupled to one side and the shackle is coupled to the other side, respectively.

Hereinafter, the embodiment of the present invention will be described in detail.

The mold applied to the present invention is formed in a plurality of layered structures as shown in FIGS. 3 and 4 to combine with each other to form a mold.

The pressure casting method using the Automatic Pressure Gelation (APG) machine has the advantage that the density of the resin product is dense.

As a raw material pretreatment process, the resin and hardener are first weighed at room temperature, and then preheated in an oven at 60 ° C., respectively, and then the preheated resin and hardener are poured into the mixing tank, the temperature of the tank is maintained at 60 ° C., and stirred with a sight glass on the tank top cover While observing, stir for about 40 minutes until defoaming is below 3 mbars.

In addition, the mold and the insert are preheated in a post-curing oven so that the temperature is 160 ° C.

When the mold release agent is applied to the inside of the mold before the mold is preheated, a jig for handling the insert is used to prevent foreign substances such as the mold release agent or the oil contained in the compressed air on the insert surface.

After the mold is mounted on the Automatic Pressure Gelation (APG) machine, the temperature sensor of the mold heating plate allows the curing to proceed sequentially from the top to the bottom according to the upper part 155 ℃, the middle part 153 ℃ and the lower part 150 ℃. .

The stirred raw material was released from the mixing tank by vacuuming, connecting the valve at the bottom of the tank and the nozzle of the APG machine with a pressure hose, and firstly observing until the raw material completely filled to the upper end of the mold, 0.3 kg / ㎠ Injection is performed by applying a pressure of ˜2 kg / cm 2.

The length of the pressure resistant hose is shortest to minimize the raw material temperature drop in the hose.

After the first pressure casting has started, harden for a suitable time, close the valve after hardening, and separate the nozzle and the mold.

After removing the mold, remove the insert holder from the workbench, finish finishing work, and then harden it for about 8 hours at a temperature of 130 ℃ in the post-curing oven and then complete the work.

The epoxy suspension insulator 10 of the present invention manufactured by such a process includes an epoxy insulation portion in which the wing portion 11 and the body portion 12 are integrally formed symmetrically; Inserts 13 are inserted into both ends of the epoxy insulation portion, and screwed to the insert 13, the eye bolt 14 is coupled to one side and the shackle 15 to the other side, respectively.

The surface of the epoxy insulation should be free from defects such as pinholes and cracks.

The insert, the insert, is an aluminum alloy material specified in KS D 6763 and shall have a tensile strength of 46kgf / mm2 or more after T4 heat treatment.

The head of the insert should be blasted on the basis of SA 2.5, and all side faces should be knurled.

In addition, the eye bolts 14 and the shackles 15 coupled to the inserts must have a tensile strength of 70 kgf / mm 2 or more, which is equivalent to the mechanical structural carbon steel specified in KS D 3572 or equivalent.

As a result of the long time load test of the epoxy suspension insulator processed by the present invention, the flashover is maintained for 24 hours while applying the specified tensile load value (7,000 × 65% = 4,600kgf) in the absence of vibration or impact. After the test, it was confirmed that there was no abnormality such as breakage of each part.

In addition, after confirming the dry flashover voltage value by applying the commercial frequency voltage (130kV) to the three commercial frequency dry flashover test results, the average voltage value of the three samples was 160kV as a result of comparing the average value with the rated dry flashover voltage value. It was confirmed that it is more than 95% of the voltage value.

In addition, good results were obtained from the aging test, the over-electric failure test, the partial discharge test, the arc-proof test, and the steep wave voltage test.

As described above, the mold applied to the present invention is a multi-layered layer without a separate discharge hole, which eliminates traces due to degassing on the surface of the product, minimizes the possibility of surface damage by making the surface as smooth as possible. This method proved to be excellent through the test of the method, and it can minimize the accident, installation, replacement, and maintenance cost of the distribution suspension insulator, and it is a useful technology that provides great power and economic benefits.

Claims (4)

Raw material pretreatment step of weighing the resin and the curing agent at room temperature and then preheating them to 60 ° C. and stirring them in a mixing tank for about 40 minutes to degas the vacuum below 3 mbars; A preheating step of applying a release agent to the mold inner surface to prevent foreign substances such as oil components from being inserted into the insert surface and preheating the mold and the insert to about 160 ° C; An injection step of attaching the preheated mold to an APG machine, connecting the mixing tank and the pressure hose, and injecting the raw material at a pressure of 0.3 kg / cm 2 to 2 kg / cm 2; Casting process; Release process; Finishing work process; Suspension insulator molding method for the distribution of epoxy casting resin, characterized in that produced by the post-curing process at 130 ℃ for 8 hours. The method of claim 1, The mold has a multi-stage layered structure of several pieces and the gap between each layer is less than 0.1μ so that only air is degassed through the gap so that there are no bubbles in the molding. Way. The method of claim 1, The mold is mounted on the APG machine during the preheating of the mold, and then the temperature sensor of the heating plate is adjusted to 155 ° C., 153 ° C. and 150 ° C. in the lower part so that the curing sequence is sequentially cured from the top. Suspension insulator molding method for epoxy casting resin distribution. An epoxy insulator having a symmetrical shape in which the wing part 11 and the body part 12 are integrally formed; Epoxy casting, characterized in that the insert 13 is inserted into both ends of the epoxy insulation portion and screwed to the insert 13, the eye bolt 14 on one side and the shackle 15 on the other side are respectively coupled Suspension insulator for resin distribution.

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