JPH01311812A - Three-phase batch type insulating spacer - Google Patents

Abstract

PURPOSE:To simplify and compact a device further by projecting the whole to a protruding shape from a peripheral support section, forming a flat section to the upper section of the protuberance and supporting the flat section by a conductor. CONSTITUTION:The outer circumferential section of the protruding section 13 of an insulating spacer is supported to the flange section 12 of a tank 11 grounded. A flat section 17 is shaped to the upper section of the protruding section 13 while being connected to the protruding section 13, and conductors 14-16 are supported to the flat section 17. Since the protruding section 13 is formed, stress at a central section is reduced. Since the flat section 17 is shaped without forming a cone section as seen in conventional devices, the trouble of stress concentration is not caused.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a three-phase bulk type insulating spacer, and more specifically, a three-phase bulk type insulating spacer applied to insulating support of high voltage conductors or gas division in gas insulated switchgear. The present invention relates to a bulk type insulating spacer.

[Conventional technology]

In general, gas-insulated substations tend to have more compact equipment, and from this point of view it is considered possible to apply higher gas pressure. Spacers are required to have mechanical strength that can guarantee long-term reliability against higher stress.

On the other hand, in terms of electrical performance, contrary to the above, in general, the thinner the insulating spacer, the better. A compact and simple structure is required.

Therefore, in the future, insulating spacers will be required to have a structure that has higher mechanical strength without impairing electrical performance and workability.

9 and 10 show a conventional three-phase all-in-one insulating spacer described in, for example, Japanese Patent Publication No. 55-18824. A base portion (43) is supported by the base portion (43). There are four cone parts (44) on the convex side of this base part (43).
, (45'l, (4i, (5o)) are formed protrudingly, and rod-shaped conductors (47), (48'), (49 ) is supported.

As described above, the conventional three-phase conical insulating spacer reduces the stress in the central part by raising the substrate part (43), and the four cones (44) to ( 46
) and (50) are evenly distributed in order to equalize and increase the rigidity.

[Problem to be solved by the invention]

Since the conventional three-phase/channel type insulating spacer is constructed as described above, it has a complicated shape, poor workability in casting, high manufacturing cost, and a convex base (4
3), four more cone parts (44) to (46), (5
0), the pitch between each conductor is increased more than necessary, leading to an increase in size. moreover,
The volume occupied by the conductor in the longitudinal direction is large, and the workability is quick when assembling and disassembling the busbar, for example. (marked with X in Figure 4), the insulator has a small radius of bending, making it easy to concentrate stress, and in order to equalize the rigidity, a fourth cone part (50) is added. There were many problems, such as the need for extra equipment.

This invention was made in order to solve the above-mentioned problems, and it simplifies the shape of the spacer, reduces the occupied volume, has almost symmetrical structure, and makes the rigidity uniform. It is an object of the present invention to obtain a three-phase-cone-shaped insulating spacer in which the problem is substantially solved without adding any additional structure, and furthermore, the stress near the center can be reduced.

[Means to solve the problem]

The three-phase, conical insulating spacer according to the present invention is made of an insulator that has a flat part on the top of a convex part that is raised from the vicinity of the support part in the flange part of the tank, and the conductor is connected to the flat part at the part of the flat part. is supported.

[For production]

In this invention, the structure is simplified by the flat part,
There is no structural non-uniformity or stress concentration in the conventional cone part.

〔Example〕

1 and 2 show embodiments of this invention, and the figures (
and the flange part (12) of the tank (11) which is grounded.
') The outer periphery of the raised portion (13) of the K insulator is supported. A flat part (17) is formed in the L part of the raised part in connection with the raised part (13), and the conductors (14) to (16) are supported on the flat part (17).

In general, from the knowledge of material mechanics, it is known that a disk (D) with a fixed circumference as shown in Fig. 3 will receive a uniformly distributed load (P) from the disk (
It is known that the stress distribution when the pressure is applied in the direction -\ perpendicular to the horizontal plane of D) is the distributed pressure shown in Figure 4, where the stress in the radial direction is (σr) and the stress in the direction perpendicular to this is (σt). Therefore, in the disk-shaped swazer, stress increases at the central portion or the peripheral support portions, and the mechanical strength at these portions becomes a problem. Furthermore, it is difficult to increase the plate thickness, especially in the central part, due to restrictions on electrical performance, and there is a need to take measures to relieve stress in the central part by other means without increasing the plate thickness.

First of all, in Figures 9 and 10, there are 1 to 1 K, like the conventional ones.
The structure in which the base part (43) is raised in a convex shape is effective in reducing the stress in the central part, and in the above embodiment, by forming the raised part (13),
Compared to disk-shaped spacers, it makes it possible to reduce stress in the center. In addition, regarding the non-uniformity of the stress distribution in the surrounding support parts, the conventional model
43) The structural non-uniformity caused by providing the cone parts (44) to (46) formed above is eliminated by forming the fourth cone part (50), but the above embodiment In this case, a flat part (17) is provided, and a cone part that causes structural non-uniformity is not provided, so that the stress distribution is inevitably made uniform.

In addition, as mentioned above, in the conventional structure, the radius of curvature of the insulator is small, especially in the valley between the cone parts (X mark in Figure 9), and stress concentration tends to occur in that part. However, in the above embodiment, since the cone portion was not provided and a flat portion (17) was provided, the stress concentration did not occur.

Furthermore, in the above embodiment, in addition to the above-mentioned stress problem, by providing the flat part (17), the following specific problems can be solved with respect to the complexity of the shape, which is one of the problems of the conventional structure. effective. First, in the past, since the cone parts (44) to (46), (50) were formed on the base part (43), the dimension (Lx) (Fig. 10) was required to be larger than necessary electrically. In the structure of the embodiment, this dimension (L2) can be reduced compared to the conventional structure [Figure 2 dimension (Ll)"l,
It becomes possible to improve assembly and disassembly workability.

Moreover, in the conventional one, four cone parts (44) to (4
6') and (50), a certain correlation distance 82 (Fig. 9) was required to form this cone part due to the structure. Providing a section necessarily leads to an increase in size in the radial direction. In this respect, in the above embodiment, since the cone part was not provided and the flat part (17) was used, Sl<S2
This allows for a more compact design.

Furthermore, as described above, the compact and simple shape has great effects in terms of manufacturing, assembly and disassembly work, and manufacturing costs.

In the above embodiment, the flat part (17) is provided in order to realize practical advantages such as manufacturing, assembly, disassembly, and cost. The length is short, and unlike the conventional device, the entire base portion (43) is not convex, but in the above embodiment, a flat portion (17) is provided above the raised portion (13). , there are differences such as the fact that the flat part (17"lK) cannot be expected to have a stress reduction effect in the central part.

FIGS. 5 and 6 show other embodiments to further alleviate the above problem, in which a flat part (23) following a raised part (23) is shown.
7) K, barriers (28a'>, (29a) + (30a) projecting on both sides of this flat part (27), respectively
), (28b), (29b), and (30b) are formed.

With the above configuration, the creepage length of the related insulator is
28a) to (30b) can be made longer, improve electrical performance, and also serve as reinforcement for the flat portion (27). Furthermore, a barrier effect against the progress of the streamer in the correlation direction can be expected.

FIGS. 7 and 8 show still another embodiment, which includes a raised part (33) and a flat part (37), and has a raised part (33) and a flat part (37).
3), a convex barrier (38a) and a concave barrier (38b) are integrally formed near the peripheral support portion.

With the above configuration, the barriers (38a) and (38b) act in the same manner as the barriers provided in relation to each other, and further effects such as suppressing the floating of foreign matter on the bottom of the tank (11) during actual machine operation can be expected.

Naturally, the barrier (28a'
) to (30a), (28b) to (30b) and the barriers (38a) and (38b) in FIGS. 7 and 8, the electrical and mechanical performance is further improved. be able to.

〔Effect of the invention〕

As described above, according to the present invention, the entire area is raised in a convex shape from the peripheral support part, and a flat part is provided on the upper part, and the conductor is supported by the flat part, so that the device is simpler and more compact. This makes manufacturing, assembly, and disassembly operations easier, reduces manufacturing costs, and increases strength without increasing the thickness of the plate.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal and cross-sectional views, respectively, of an embodiment of the present invention, and Figures 3 (al and 3) are plan views and side sectional views showing a disk to which a uniformly distributed load l is applied. , FIG. 4 is a stone stress distribution diagram in FIG. 3, FIGS. 5 and 6 are longitudinal sectional views and cross-sectional views of other embodiments, respectively, and FIGS. 7 and 8 are diagrams of still other embodiments. FIGS. 9 and 10 are longitudinal and cross-sectional views, respectively, of a conventional three-phase wire-shaped insulating spacer. (11) Φ tank, (12) ...Flange part, (14
), (15), (16)...conductor, (13), (23
). (33)・φ raised part, (17), (2'l, (3
7) Fist/flat part, (28a) to (30a), (28b)
~(30b). (38a), (38b)... Barrier. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Zeng Wa Dao Teru1':'l:j1. :1+4
．． 15.16 Sutakuyu 4 drawing procedure amendment document December 12, 1988

Claims (1)

[Claims] In a three-phase bulk type insulating spacer made of an insulator and used to hold a high voltage conductor in a grounded tank, a raised part that is raised in a convex shape from the vicinity of a peripheral part supported by a flange part of the tank; A three-phase all-in-one insulating spacer comprising: a flat portion that supports the three-phase conductors formed continuously on the raised portion;