JPH0564342A - Insulated through conductor structure - Google Patents

Abstract

PURPOSE:To make it cheap insulated through conductor structure by decreasing the thickness of an insulating spacer. CONSTITUTION:This device adopts the constitution of providing an auxiliary metal fitting 4 made of a steel plate, which contacts with the whole face exclusive of the section of the through conductor 1 on the opposite side of the insulated spacer 2 from the sealed container, and attaching this to the sealed container together with the mounting metal fitting 3, whereby when the insulating spacer 2 receives the outward force by the inner pressure of the sealed container, the auxiliary metal fitting 4 receives this force outside the insulating spacer 2, so the force applied to the insulating spacer 2 itself diminishes, and the thickness of the insulating spacer 2 can be thinned, and the quantity of used expensive epoxy resin being the material of the insulating spacer 2 can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating punch-through conductor structure for drawing out a high-voltage conductor in a hermetically sealed container of a gas-insulated electric switch such as a gas-insulated switchgear or a gas-insulated transformer.

[0002]

2. Description of the Related Art FIG. 5 is a plan view of a conventional insulating punch-through conductor structure. In this figure, there are seven penetrating conductors 1 which penetrate through an insulating spacer 2 formed by molding an epoxy resin, which is a thermosetting resin, into a predetermined shape.
The insulating spacer 2 has a substantially disk shape, and a mounting bracket 3 is fitted around the insulating spacer 2. By tightening a bolt through a bolt hole 31 provided in the mounting bracket 3, the insulating spacer 2 is hermetically mounted on a flange portion of a sealed container (not shown). Be done.

FIG. 6 is a sectional view taken along line CC of FIG. In this figure, the insulating spacer 2 through which the through conductor 1 penetrates
Has a structure protruding upward and downward in the drawing, and in particular, the protruding length on the outside air side, which is the lower side of the drawing, is increased to attach the through conductors 1 and the through conductors 1 along the surface of the insulating spacer 2. The structure is such that the distance to the metal fitting 3, that is, the creepage distance is increased. The upper side of the figure is a sealed container, in which a high-pressure insulating gas usually called SF6 is filled, and high insulation strength is secured.

A groove is provided on the inner surface of the mounting bracket 3, and the mounting bracket 3 and the punch-through conductor 1 are also pre-assembled in the molding work in which the insulating spacer 2 is injected into the mold with the liquid resin before curing and is cured by heating. Then, the resin is injected and heat-cured while being attached to the mold. Therefore, since the resin also enters the above-mentioned groove, the cured insulating spacer 2 and the mounting member 3 are mechanically integrated.

In the state where these insulating punch-through conductor structures are attached to a hermetically sealed container and a high-pressure insulating gas is sealed inside, the insulating spacer 2 is projected downward by receiving pressure from the upper part of the figure inside the hermetically sealed container. To be transformed. If the stress due to this deformation exceeds the allowable stress of the material of the insulating spacer 2, the insulating spacer 2 will be destroyed. Therefore, the thickness dimension of the insulating spacer 2 is set to sufficiently withstand such an internal pressure.

On the other hand, as described above, the creepage distance along the surface of the insulating spacer 2 is determined by the voltage of the punch-through conductor 1 and is determined by the dielectric strength of air, so that it is sufficient regardless of the pressure of the insulating gas. The dimension between the punch-through conductors 1 and the projecting length of the projecting portion are determined so as to secure the value.

[0007]

As described above, the thickness of the insulating spacer 2 needs to be increased as the pressure of the insulating gas in the hermetically sealed container is higher. Therefore, the amount of resin required for the insulating spacer 2 is increased. Not only does this increase the cost, but also because the thickness is large, the residual stress that occurs with temperature changes during curing increases and the mechanical strength decreases, so it is necessary to further increase the thickness. Problems arise.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an insulating punch-through conductor structure which has a reduced thickness of the insulating spacer and which is generally inexpensive.

[0009]

In order to solve the above-mentioned problems, according to the present invention, a high-voltage conductor inside a metallic hermetically sealed container in which a high-pressure insulating gas is sealed and a high-voltage conductor outside the hermetically sealed container are electrically connected. In an insulating punch-through structure in which at least one punch-through conductor that is electrically connected penetrates through an insulating spacer that is airtightly mounted in the hermetically sealed container and is formed in a predetermined shape, the insulating punch-out conductor excludes a portion where the punch-through conductor penetrates. An auxiliary metal fitting made of a steel plate is provided in contact with the entire surface of the spacer on the side opposite to the hermetically sealed container, and the auxiliary metal fitting is mounted together with the mounting metal fitting of the insulating spacer.
An elastic plate is interposed between the insulating spacer and the auxiliary metal fitting, and the auxiliary metal fitting is integral with the mounting metal fitting.

[0010]

In the structure of the present invention, by adopting a structure in which an auxiliary metal fitting made of a steel plate is provided which is in contact with the entire surface of the insulating spacer on the side opposite to the hermetically sealed container except for the penetrating conductor, and which is attached to the hermetically sealed container together with the mounting hardware. , When the insulating spacer receives a force toward the outside due to the internal pressure of the sealed container, the auxiliary metal fitting receives this force outside the insulating spacer and the force applied to the insulating spacer itself is reduced. Can be made smaller.

Further, by interposing an elastic plate between the insulating spacer and the auxiliary fitting to make the force transmission between the insulating spacer and the auxiliary fitting uniform, the force transmission to the auxiliary fitting may be insufficient. It is possible to prevent the deviation. In addition, since the auxiliary metal fitting is integrally formed with the mounting metal fitting, the auxiliary metal fitting can be molded together with the insulating spacer, so that no gap is generated between the insulating spacer and the auxiliary metal fitting.

[0012]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a plan view of an insulating punch-through conductor structure showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA, and the same members as those in FIGS. To do. In these drawings, an auxiliary metal fitting 4 having a through hole through which the protruding portion of the through-hole conductor 1 and the insulating spacer 2 in the portion penetrates is attached to the outside air side which is the lower side of FIG. It is mechanically integrated with the insulating spacer 2 and the mounting bracket 3 by inserting a bolt into and tightening.

The auxiliary metal fitting 4 suppresses the insulating spacer 2 from being deformed to be convex downward in FIG. 2 due to the internal pressure of the hermetically sealed container, and the auxiliary metal fitting 4 works to bear the internal pressure. As is well known, the Young's modulus of the epoxy resin, which is the material of the insulating spacer 2, is much larger than that of the steel plate, which is the material of the auxiliary metal fitting 4, so that the auxiliary metal fitting 4 bears much more force due to the same deformation amount. As a result, the insulating spacer 2 is protected from internal pressure.

Since the auxiliary metal fitting 4 bears the force due to the internal pressure of the sealed container, the mechanical strength of the insulating spacer 2 with respect to the internal pressure can be much smaller than the case where the auxiliary metal fitting 4 is not provided. It is not necessary to take it, and the size of the insulating spacer 2 may be determined mainly from the standpoint of insulation strength, and the rational manufacturing of the insulating spacer 2 becomes possible.

The auxiliary metal fitting 4 is an insulating spacer 2 or a mounting metal fitting 3.
Since the insulating punch-through conductor structure, which is manufactured separately from the above, is attached together when it is attached to the sealed container, the contact between the auxiliary metal fitting 4 and the insulating spacer 2 is not always uniform, and a gap may be partially formed. .. When such a gap is generated, the force received by the auxiliary metal fitting 4 becomes uneven, and the stress of the insulating spacer 2 is biased and concentrated to lower the mechanical strength. Therefore, the contact surface between the insulating spacer 2 and the auxiliary metal fitting 4 is reduced. By interposing an elastic plate such as a rubber plate, it is possible to alleviate such stress bias and concentration.

FIG. 3 is a plan view of an insulating punch-through conductor structure showing another embodiment of the present invention, and FIG. 4 is a sectional view taken along line BB thereof. The same members as those in FIGS. 1 and 2 are designated by the same reference numerals. Detailed description is omitted. The difference between these figures and FIG. 1 and FIG. 2 described above is that the mounting metal fitting 3 and the auxiliary metal fitting 4 of FIGS.
Therefore, when the insulating spacer 2 is molded, the mounting bracket 40 with the auxiliary metal fitting is also set and molded in the mold, and the mounting metal fitting 40 with the auxiliary metal fitting and the surface in contact with the insulating spacer 2 are in close contact with each other. Since the clearance is eliminated, the problem that the mechanical strength of the insulating spacer 2 is reduced due to the reliable application of the force by the attachment fitting 40 with the auxiliary fitting does not occur.

[0017]

As described above, according to the present invention, an auxiliary metal fitting made of a steel plate is provided which is in contact with the entire surface of the insulating spacer on the side opposite to the hermetically sealed container except for the portion where the penetrating conductor penetrates. By adopting the mounting configuration, when the insulating spacer receives a force toward the outside due to the internal pressure of the sealed container, the auxiliary metal fitting receives this force outside the insulating spacer and reduces the force applied to the insulating spacer itself. The thickness of the insulating spacer can be reduced. As a result, the resin amount of the insulating spacer is reduced, and the material cost is reduced. Generally, the price of thermosetting resin such as epoxy resin used for the insulating spacer is much more expensive than that of steel material, and thus the effect of contributing to the cost reduction of the insulating punch-through conductor structure can be obtained by reducing the amount of resin used.

Further, by interposing an elastic plate between the insulating spacer and the auxiliary metal fitting to make the force transmission uniform between the insulating spacer and the auxiliary metal fitting, the force transmission may be insufficient or biased. Can be prevented. Also,
The number of parts can be reduced by integrating the auxiliary metal fittings with the mounting metal fittings.

[Brief description of drawings]

FIG. 1 is a plan view of an insulating punch-through conductor structure showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of an insulating punch-through conductor structure showing another embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a plan view of a conventional insulated punch-through conductor structure.

FIG. 6 is a sectional view taken along line CC of FIG.

[Explanation of symbols]

 1 Through conductor 2 Insulating spacer 3 Mounting bracket 4 Auxiliary bracket 40 Mounting bracket with auxiliary bracket

Claims (3)

[Claims] 1. At least one punch-through conductor for electrically connecting a high-voltage conductor inside a metallic hermetically-sealed container in which a high-pressure insulating gas is sealed and a high-voltage conductor outside the hermetically-sealed container hermetically to the hermetically-sealed container. In an insulating punch-through structure formed by punching through an installed insulating spacer formed into a predetermined shape, an auxiliary metal fitting made of a steel plate that is in contact with the entire surface of the insulating spacer on the side opposite to the hermetically sealed container is provided except for a portion where the through conductor penetrates, An insulating punch-through conductor structure characterized in that this auxiliary metal fitting is mounted together with the mounting metal fitting of the insulating spacer. 2. The insulating punch-through conductor structure according to claim 1, wherein an elastic plate is interposed between the insulating spacer and the auxiliary metal fitting. 3. The insulating punch-through conductor structure according to claim 1 or 2, wherein the auxiliary metal fitting is integrally formed with the mounting metal fitting.