JPS5915445Y2 - Abnormal voltage absorption device - Google Patents

Description

[Detailed explanation of the invention] This invention is an abnormal voltage absorbing device formed by stacking nonlinear resistor elements whose main component is zinc oxide, etc., and more specifically, an abnormal voltage absorbing device formed by stacking nonlinear resistor elements whose main component is zinc oxide, etc. It is related to the structure of

Generally, lightning arresters are made of metal oxide-based nonlinear resistor elements with excellent nonlinearity, such as those made of zinc oxide as a main component.
Those stacked inside an insulator pipe are used.

In such a lightning arrester, it is necessary to prevent the non-linear resistor elements stacked in the insulator tube from misaligning with each other, and to widen the gap between each resistor element and the insulator tube to prevent the generation of corona. .

For this purpose, it is necessary to prevent each non-linear resistor element from shifting its position, and to arrange and fix the stack of non-linear resistor elements in the center of the porcelain tube.

Conventionally, there have been methods shown in FIGS. 1 to 3 as means for fixing and arranging this stack of non-linear resistor elements within an insulator tube.

In the conventional example shown in FIG. 1, several struts 2 are arranged around each non-linear resistor element 1 stacked in an insulator tube, and the upper and lower ends of the struts 2 are inscribed in the insulator tube (not shown). A triangular support plate 3 is attached, and a spring 4 is provided between the uppermost nonlinear resistor element 1 and the upper support plate 3 to press each resistor element 1 downward.

However, in this structure, the gap with the insulator tube is reduced by the volume of the support column 2.

Further, since the dielectric constant of the support column 2 is larger than that of the gap, a large voltage is distributed to the minute gap between the resistor element 1 and the support column 2 and between the column 2 and the porcelain tube, causing corona discharge.

If such corona discharge occurs for a long period of time, the resistor element 1
The insulation properties of the surface will be impaired, eventually leading to surface flashover.

Moreover, such assembly and fixation using the pillars 2 and the support plate 3 takes time and effort, and there is also the problem that the non-linear resistor elements 1 may be misaligned with each other.

In the conventional example shown in FIG. The resistor element 1 is intended to be fixed to the center of the porcelain tube by appropriate supporting means.

However, especially in cases where the surface of the porcelain tube is likely to be contaminated, such as in a contamination-resistant lightning arrester, it is not possible to completely eliminate corona generation due to the potential difference between the resistor element 1 and the porcelain tube.

Further, there is a problem in that tape winding is time-consuming and requires skill to wind evenly.

Furthermore, FIG. 3 shows a non-linear resistor element 1 and a metal connecting plate 6 having a diameter larger than that of the non-linear resistor element 1.
The metal connecting plates 6 are alternately stacked inside the insulating tube 7 and the outer peripheral ends of the metal connecting plates 6 are fixed in close contact with the insulating tube 7.

This stacked structure 8 is attempted to be fixed at the center of the insulator tube using appropriate support means, but in this case as well, the non-linear resistor element 1 is fixed only by frictional resistance, so there is a problem of positional displacement. ing.

Another drawback is that alignment during stacking becomes complicated.

Therefore, in view of the above-mentioned drawbacks, this invention is intended to improve and eliminate this problem, and the illustrated example will be described below.

That is, as shown in FIG. 4, this invention uses an insulating tube 9 made of a material with excellent insulating electrical properties and mechanical strength, for example, a thermosetting resin such as glass fiber reinforced resin.
This is the source in which the nonlinear resistor element 1 is stacked.

In the embodiment shown in FIG. 4, the stacked non-linear resistor elements 1 are directly inscribed in an insulating tube 9 and are stacked, and presser metal fittings 10 are placed at the upper and lower ends of the stack to fix them.

With this structure, there is a void in the center of the insulator tube, and measurements are taken using appropriate means.

With such an assembly structure, there is no mutual displacement of the non-linear resistor elements 1, and therefore, the contact area of each non-linear resistor element 1 can be maintained wide, and the electrical characteristics can be improved.

Furthermore, since the non-linear resistor elements 1 are positioned by the insulating tubes 9, if the insulating tubes 9 are placed at the center of the insulator tube, the distance between each non-linear resistor element 1 and the insulator tube can be kept constant. can.

Therefore, even without enlarging the overall structure, a sufficient gap can be provided between the resistor element 1 and the insulator tube, and the anti-corona characteristics are improved.

Furthermore, since the non-linear resistor element 1 with high hardness is completely fixed within the insulating tube 9, even if external vibrations are applied, the non-linear resistor element will not hit the insulator tube, causing damage to the insulator tube. can be prevented.

Furthermore, this assembly can be accomplished by simply attaching the insulating tube 9 to the stacked nonlinear resistor elements 1, resulting in extremely improved workability.

Next, this application example will be explained.

. In the embodiment shown in FIG. 4, FIG.
0, a compression spring 11 is left open between the two.

By applying a pressing force in the stacking direction in this manner, the contact between the respective nonlinear resistor elements 1 can be improved, and the electrical characteristics can be improved.

In the embodiments shown in FIGS. 4 and 5 above, a gas vent hole 9a may be provided in the insulating cylinder 9 as appropriate, as shown in FIG.

With the gas vent hole 9a, gas or heat generated when the nonlinear resistor element 1 is energized can be dissipated.

In addition, the embodiment shown in FIG. 7 has excellent electrical properties such as insulation, high conductivity, and large elasticity between the nonlinear resistor element 1 and the insulating tube 9, which are laminated inside the insulating tube. Filler with 1
2. The nonlinear resistor element 1 and the insulating tube 9 are integrated by filling with silicone rubber, for example.

With such a configuration, even if an abnormal voltage that exceeds the duty is applied to the abnormal voltage absorbing device, the nonlinear resistor element 1 is destroyed, a short circuit arc is generated, and the internal pressure suddenly increases, Its elastic structure can prevent insulating containers such as porcelain pipes from breaking and scattering.

Furthermore, since the filler 12 completely closes the gap between the nonlinear resistor element 1 and the insulating tube 9, no corona discharge occurs in this area.

Therefore, there is no risk of surface sparkling occurring due to damage to the insulation between the non-linear resistor element 1 and the insulating tube 9.

Moreover, what is shown in FIG. 8 is an embodiment in which a compression spring 11 similar to the embodiment in FIG. 5 is used in the embodiment in FIG.

The compression spring 11 is buried in a filler 12 between the non-linear resistor element 1 on the uppermost stage and the presser fitting 10 on the upper end side.

In this case, displacement of the non-linear resistor elements 1 can be prevented, good contact between the non-linear resistor elements 1 can be achieved, and electrical characteristics can be improved.

Next, a specific embodiment of the abnormal voltage absorbing device of this invention will be described.

FIG. 9 shows an insulator tube 13 that houses the aforementioned insulating tube 9 into which the non-linear resistor element 1 is integrated.

The non-linear resistor element 1 and the like are housed inside the insulator tube 13 as shown in FIG.

That is, in the figure, 1 is a stacked non-linear resistor element, 9 is an insulating tube made of thermosetting resin reinforced with glass fiber, and 14 is a contact inserted between each non-linear resistor element 1. A metal plate for reducing resistance, 12 a filler such as silicone rubber filled between the non-linear resistor element 1 and the insulating cylinder 9, 10 arranged at the upper and lower ends of the stacked non-linear resistor elements 1 10 a is a pin for fixing the presser fitting to the insulating tube 9; 11 is a pin that is compressed and opened between the top of the stacked nonlinear resistor elements 1 and the presser fitting 10; The compression spring 15 is a gap between the insulating tube 9 and the insulator tube 13, and a dry gas such as N2 gas is sealed in the gap.

16 is a compression spring for sealing N2 gas in the gap 15.

In this embodiment, a structure of the type shown in FIG.
0 are electrically connected to connection terminals 17 and 18 of the upper and lower outer conductors, respectively.

As explained above, this invention has a nonlinear resistor element that has high electrical insulation, high thermal conductivity, and large elasticity like silicone rubber in an insulating cylinder made of thermoset resin reinforced with glass fiber. They are stacked so that they are in contact with each other through a filler made of materials, and presser fittings that serve as electrodes are placed and fixed at the upper and lower ends of the insulating tube, and using the presser fittings at both ends of the insulating tube, the insulating tube is The insulating tube has excellent heat resistance and mechanical strength because it is fixed with an annular gap in the center of the insulating container, and the annular gap is filled with insulating gas. Since the non-linear resistor element is elastically protected, even if an abnormal voltage that exceeds the duty of the non-linear resistor element is applied and rupture occurs due to dielectric breakdown, the silicon and insulating tube absorb and alleviate this. It is extremely safe as it protects insulating containers such as hard pipes from breaking and scattering.

Further, all the gaps between the non-linear resistor element and the insulating cylinder are filled with a filler such as silicone rubber, thereby preventing corona discharge and surface sparkling in this area.

Furthermore, since the presser metal fittings serving as electrodes are provided at both the upper and lower ends, heat conduction and heat capacity are large, and heat is radiated to the outside through the presser metal fittings, thereby preventing burnout of the insulating container such as the porcelain tube.

Moreover, since the insulating tube is supported by an insulating container such as an insulating tube with holding metal fittings at both ends, an even and wide annular gap is formed over the entire length between the insulating container and the insulating tube, and within this gap. By filling in an insulating gas, it is possible to reliably prevent the occurrence of corona discharge.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional stacked structure of non-linear resistor elements, Figs. 2 and 3 are also sectional views showing the conventional structure, and Fig. 4 is a sectional view showing an example of the basic structure of this invention. , FIGS. 5 to 8 are sectional views showing examples of its application, FIG. 9 is a front view showing the external appearance of a specific embodiment of this invention, and FIG. 10 is a half sectional view showing its internal structure. . DESCRIPTION OF SYMBOLS 1...Non-linear resistor element, 9...Insulating cylinder, 10...Pressing metal fitting, 11...Compression spring, 12... Filler (silicone rubber)
, 13...Insulator tube, 14...Metal plate, 1
5...Gap.

Claims (1)

[Scope of utility model registration request] A nonlinear resistor element is placed inside an insulating tube made of thermosetting resin reinforced with glass fiber, and is made of high electrical insulation material such as silicone rubber.
They are stacked so that they are in contact with each other through a filler made of a material with high thermal conductivity and high elasticity, and presser metal fittings that serve as electrodes are placed and fixed at the upper and lower ends of the insulating cylinder, and the presser metal fittings at both ends of this insulating cylinder are fixed. An abnormal voltage absorbing device characterized in that the insulating tube is fixed to an insulating container such as a porcelain tube with an annular gap at the center thereof, and an insulating gas is filled in the annular gap.