KR200154196Y1 - Housing structure for polymer arrester - Google Patents

Abstract

The present invention relates to a double housing and an improved electrode structure of a polymer lightning arrester. In a polymer lightning arrester made of a composite material, an internal component such as a current-limiting element is housed inside a housing, and a jaw is applied to the electrode to stress-fit the housing. A double housing and an improved electrode structure of a polymer arrester having a double housing structure that is perfectly sealed to protect against shrinkage and expansion.

Description

Dual housing and improved electrode structure of the polymer arrester

1 is a cross-sectional view of the present invention.

Figure 2 is an exploded perspective view showing the internal configuration of the present invention.

3 is a conventional cross-sectional view.

* Explanation of symbols for main parts of the drawings

10, 20: terminal 11, 21: electrode

11a, 21a: Goal 11b: Knurled Surface

11c: Jaw 11d: Stress relief

12, 22: disk 13, 23: disc spring

14, 24: disc spring support disk 15, 25: Korean wave element

16: stress relief housing 26: taping film

17, 27: wound insulating support housing 18, 28: Shed

19, 29: SUS cap

The present invention relates to a double housing and an improved electrode structure of a polymer lightning arrester. In a polymer lightning arrester made of a composite material, an internal component such as a current-limiting element is housed inside a housing, and a jaw is applied to the electrode to stress-fit the housing. A double housing and an improved electrode structure of a polymer arrester, which is completely sealed to protect against shrinkage and expansion.

A lightning arrester for power equipment refers to a kind of protection device that limits overvoltage and blocks the flow current such as switching surge caused by lightning strikes or circuit breakers in high-voltage lines of transmission and distribution and substations. ) And sheds are important to protect internal components such as current-limiting elements from the external natural environment, and to maintain a structure free from shrinkage and expansion cracks and relaxation when the current-limiting elements generate heat due to surge and overvoltage. . The shed is made of rubber material and has a shape that is piled up on the outer surface of the housing, and achieves sufficient surface leakage distance and arc distance, and is exposed to rain, moisture, salting, and pollution. The insulation above the threshold must be maintained. Inside the housing and the shed, the metal oxide Zn0 block, which is a voltage-current nonlinear resistance current limiting element without series gap, is stacked and sealed together with components such as electrodes and shunt springs. Disconnector).

In the related art, the polymer arrester has a disc spring support disk 24, a disc spring 23, and a disc 22 symmetrically about a plurality of central current-limiting elements 25 as shown in FIG. And the electrode 21 is connected in series, the outside of the taping film 26, the winding insulating support housing 27 and the shed 28 is softly surrounded. Both end surfaces of the shed 28 are sealed by the SUS cap 29 and connected to the terminal 20. The upper part of the terminal 20 is mounted with an electric wire, and the lower part is connected with a disconnector.

The polymer arrester has a current-limiting element 25, a disc spring support disk 24, a disc spring 23, and a disc 22 and an electrode 21 against mechanical displacement caused by temperature change. It is responsible for buffering and maintaining electrical contact. However, when the electrical contact is degraded, a gap is generated in the series connection of the Zn0 current-limiting element 25, and thus the function of the arrester is lost. In this case, the ground is grounded. In order to prevent this, a current-limiting element 25 connected in series using a wound insulating support housing 27 which functions as a kind of insulated tube, a disc spring support disc 24, a disc spring 23, and a disc 22 are provided. And the alignment form of the electrode 21 is maintained. The wound insulating support housing 27 has a current-limiting element 25, a dish spring support disk 24, a dish spring 23, and a disk after glass fiber is impregnated with the softenable resin. 22) and the electrode 21 is wound to maintain an angle with respect to the aligned axial direction, and then moved to the curing oven and the resin is cured to become a molded article reinforced with glass fiber. On the other hand, in order to make a molded article of the winding insulating support housing 27 reinforced with glass fiber, the current-limiting element 25, the disc spring support disk 24, the disc spring 23, the disc 22 and the electrode ( 21) is symmetrical in the axial direction and needs to be aligned in a straight line. The tape is wound at right angles to the axial direction using a taping film 26 which is an insulating tape. At this time, if a gap occurs in the layer of the wound taping film 26, the resin penetrates during molding and insulates the current-limiting element 25 and the current-limiting element 25, so that the tape layer should be firm to prevent liquid resin from penetrating. In particular, since the taping operation of the valley 21a portion of the electrode 21 maintains an angle of 45 degrees, it is very difficult to work without a dedicated machine and skilled technology. Even after molding after the taping operation, a gap occurs at the interface between the valley 21a of the electrode 21 and the molded resin layer due to mechanical stress due to temperature change, and the electrode and the housing are detached. Become.

In addition, when switching surge, overvoltage, etc. are drawn over the capacity during use, a large amount of gas is generated while penetrating destruction or creepage flashover occurs, and the internal pressure rapidly rises. In this case, the current-limiting element 25 sometimes generates heat. The housing may be destroyed due to abnormal operation without proper discharge, which may result in personnel accidents, as well as economical damage to nearby power equipment due to scattering of debris and members as well as power failure due to power accidents. When a large surge voltage exceeding the rated voltage such as lightning occurs, the current-limiting element 25 is broken and the housing and cracks are scattered, and the parts and debris are scattered. Thermal stress caused by -40 to +40 degrees) and the winding insulation support housing (27) There is a disadvantage that the gap is generated and detached at the heterojunction interface of the electrode 21 and the insulating supporting housing 27 wound along with the contraction and relaxation due to mechanical displacement transmitted to the pole 21.

In addition, there are inventions in which the insulating cylinders described in Patent Publication No. 95-11344 and International Patent Application Publication No. 95-702329 are interpolated. However, these inventions are different from those of the present invention having a double housing structure.

The present invention was devised to improve the above-mentioned conventional problems. In a polymer lightning arrester made of a composite material, an internal part such as a current-limiting element is housed inside a housing, and a jaw is applied to the electrode to relieve stress. Its purpose is to provide a polymer arrester with a double housing structure that is completely sealed by fitting to protect it from shrinkage and expansion and aims to minimize difficult work processes in its manufacturing process.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. According to the present invention, as shown in FIGS. 1 and 2, the disc spring support disk 14, the disc spring 13 and the disc 12 are symmetrically around a plurality of central current-limiting elements 15. The jaw 11c of the electrode 11, which is accommodated in the stress relief housing 16 and is formed with one step of the jaw 11c smaller than the outer diameter of the knurled surface 11b by the thickness of the stress relief housing 16, is formed. Both ends of the stress relief housing 16 are inserted. The jaw (11c) portion of the electrode 11 has a stress relief treatment (11b) to ensure a perfect sealing when the stress relief housing 16 is fastened to block the penetration of moisture and inside the current-limiting element (15) It prevents the oxidation and corrosion of parts to keep the function of the arrester. In addition, even if abnormality occurs in the heterogeneous bonding of the winding insulation support housing 17 side and the electrode 11 in the valley 11a (the material of the electrode is Al, the material of the winding insulation support housing is soft-curable resin and glass fiber). As the relief housing 16 acts as a buffer and bridge, another barrier is formed to have a more rigid sealing structure. The winding insulation support housing 17 and the shed 18 are softly enclosed to the outside of the electrode 11 and the stress relief housing 16 sealedly connected thereto. Both end surfaces of the shed 18 are sealed by the SUS cap 19 and fixed by the terminal 10.

When the switching surge and the overvoltage are drawn in more than the capacity of the present invention, the stress relief housing 16 containing the internal components such as the current-limiting element 15 may increase pressure due to gas and expansion due to heat. As the primary absorbing and mitigating effect, the wound insulating support housing 17 is less impacted, and even though the pressure caused by the gas increases therein, the pressure drops while passing through the lower part of the stress relief housing 16, thereby assembling the arrester. This probability of destruction is less. That is, another barrier is formed by inserting the stress relief housing 16 therein to have a more rigid sealing structure. In addition, thermal stress generated during normal operation, abnormal operation, or seasonal temperature difference (about -40 to +40 degrees) is transmitted to the winding insulation support housing (17) and the electrode (11) to prevent mechanical displacement. In some cases, the electrode 11 and the insulated support housing 17 wound by the electrode may be detached due to shrinkage and relaxation. In this case, the introduction of the stress relief housing 16 may cause the desorption phenomenon of the electrode by the displacement buffering action of the stress relief layer. You can prevent it.

As described above, the present invention has a dual housing structure as well as the economic effect of the process shortening in the manufacturing process by assembling and using the stress relief housing instead of the process of taping the conventional tape film vacuum compared to the conventional Even if the working environment is not heavy, the internal exposure time of the internal elements is reduced, and the buffering effect of the internal stress relief housing prevents the formation of pinholes between the externally wound insulating support housing and the electrodes. have.

Claims (1)

A spring member and an electrode having a pair of buffering effects symmetrically about a plurality of current-limiting elements therein, a housing of a polymer arrester having an outer shell insulator and an insulating housing, and an electrode structure thereof A stress relief housing 16 for accommodating a pair of well-known plate spring support disks 14, plate springs 13, and disks 12 formed symmetrically with respect to the center; The jaw 11c is made smaller by the thickness of the stress relief housing 16 than the outer diameter of the knurling surface 11b, and the jaw 11c portion is stress-relieved 11d so as to be provided at both ends of the stress relief housing 16. Dual housing and improved electrode structure of a polymer lightning arrester, characterized in that it comprises an electrode 11 is inserted and in close contact.