JPH07264754A - Conductor support - Google Patents

Abstract

PURPOSE:To obtain a conductor support which can reduce the space required for arranging a conductor without lowering the strength endurable to an electromagnetic force appearing between phases. CONSTITUTION:A pair of embedded metals 5A with female thread are provided at a single side of a single surface of a flat rectangular pole type insulation resin 4 and a pair of embedded metals 5A with female thread are provided to the other side of the other surface of the insulation resin 4 to become symmetrical with the pair of embedded metals 4A with female thread in the single side of the single surface. When a conductor is supported at both surfaces of a conductor support 3A sandwiching the conductor support 3A, the space occupied by the conductor support can be reduced by overlapping a part of the conductor supports 3A at both sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor support for supporting a conductor or the like arranged inside a metal closed switchgear.

[0002]

2. Description of the Related Art Even in a metal closed switchgear (hereinafter simply referred to as a switchgear), due to technological advances such as miniaturization of a vacuum circuit breaker housed inside and electronic protection equipment, a multistage vacuum circuit breaker As the number of products is increasing, the size of the power receiving and transforming equipment is being reduced in combination with the user's request for reduction of the installation floor area.

Among them, in the high-voltage switchgear, a gas-insulated switchgear for accommodating each device (vacuum circuit breaker, disconnecting switch, grounding device, etc.) in a box-shaped pressure container for each line unit is adopted. There are many.

In this gas-insulated switchgear, the inside is generally divided into several gas compartments, and the electric equipment is housed in each of these gas compartments at a high density and the interior is filled with an insulating gas. As a result, the layout of each electric device itself and the conductors of the main circuit have been further miniaturized.

However, in such a gas-insulated switchgear, as described above, the equipment and conductors of the main circuit are housed in a hermetically sealed container, so phase detection of the main circuit and measurement of the insulation resistance of the main circuit are performed. When performing, a method of forming a grounding circuit by a grounding device and drawing a conductor to the air side through a gas air bushing for measurement is generally adopted.

The conductor support for supporting the conductor of the ground circuit has the following features: (1) The conductor of the ground circuit is surely insulated from the supporting portion of the ground potential and the dielectric strength against the voltage applied at the time of measuring the main circuit insulation. Be prepared. (2) Withstand mechanical strength such as electromagnetic force applied between the phases of the conductors. (3) The conductors should be supported compactly so that the density of the main circuit equipment as well as the switchgear body is not compromised. Is required.

In the medium and low pressure switchgear,
Since the number of conductors connecting the vacuum circuit breakers housed in the upper and lower stages increases, and the space occupied by this conductor is large, it is most important to reduce the space for arranging this main circuit conductor in order to miniaturize the switchgear body. It is effective.

To this end, the conductor support that supports the main circuit conductor must have (1) dielectric strength against commercial frequencies and lightning impulse withstand voltage. (2) Tolerate the strength against electromagnetic force applied between the phases of adjacent conductors. Is required.

In the conventional switchgear, for example, a cylindrical conductor support as shown in FIG. 7 is used as shown in FIG. 8 to support the conductor. Note that FIG. 7A is a plan view showing a conventional conductor support, and FIG. 7B is an E- of FIG.
The E sectional view is shown.

In the conductor support 10 shown in the same figure, the embedded metal fittings 14 are symmetrically arranged on the upper and lower sides, respectively, and integrally cast with the insulating resin 4. The insulating resin 4 is provided between the upper and lower embedded metal fittings 14. It is insulated.

FIG. 8A is a plan view showing an example of a state in which the conductor support 10 supports three-phase conductors, and FIG.
Shows a right side view of (a). (Note: Shown by changing the 90 ° direction on the space). As shown in the figure, each conductor 2 is supported and fixed to the ground potential mounting portion 1 of the switchgear body through the conductor support 10 by the bolts 7 to insulate each phase and ground from each other.

[0012]

However, in the conductor support 10 configured as described above, the embedded metal fittings 14 arranged above and below are arranged opposite to each other with the thickness t of the insulating resin 4 interposed therebetween, and The height T4 of 10 is the height t of the embedded metal fitting 14
Since it is determined by a and the thickness t of the insulating resin, the height increases.

Since each conductor 2 is supported by the conductor support 10 as shown in FIG. 8, the interphase dimension T5 and the interground dimension T6 of the conductor 2 shown in FIG. It is necessary to have more than the dimension required for insulation (Note: the height of the conductor support 10 required to obtain the creepage distance required to withstand the interphase voltage).

Further, the adjacent conductor supports 10 via the conductor 2 have a longer dimension for avoiding interference with the bolts 7, and the support dimension W2 at one location is longer. Therefore, in FIG. 8A, the length of the nine conductor supports in the front-rear direction, 2P + W2, is increased.

Therefore, an object of the present invention is to obtain a conductor support which can reduce the space for disposing the conductor without reducing the mechanical strength against the electromagnetic force acting between the phases.

[0016]

According to a first aspect of the present invention, there is provided a conductor support in which a metal pad is embedded in parallel surfaces of both ends of an insulating layer and a strip plate-shaped conductor is supported on one side or both sides. It is characterized in that one side of one side of the other side is embedded on one side of one side, and the other side of the parallel side is embedded symmetrically on the other side.

Further, according to a second aspect of the present invention, in a conductor support in which a metal screw embedded metal is embedded in parallel surfaces of both ends of an insulating layer to support a strip plate-shaped conductor on one side or both sides,
It is characterized in that one side of the parallel surface is buried in one side of one side, and the other side of the parallel surface is buried in the other side symmetrically with the one side.

According to a third aspect of the present invention, in a conductor support in which a buried metal is embedded in parallel surfaces of both ends of the insulating layer and one or both surfaces support a strip-shaped conductor, the insulating layer is flat. It has a columnar shape, and one side of the parallel surface is buried on one side of the one side, and another side of the parallel surface is buried on the other side symmetrically with the one side.

Further, according to a fourth aspect of the present invention, in a conductor support in which a buried metal is embedded in parallel surfaces of both ends of an insulating layer and a strip plate-shaped conductor is supported on one surface or both surfaces, at least the buried metal is provided. One side has a convex shape, one side of the parallel surface is embedded in one side, and the other side of the parallel surface is embedded in the other side symmetrically with the one side. And

[0020]

In the inventions of claims 1, 2 and 3, when the conductors are supported on both sides of the conductor support,
The conductor supports arranged on both sides of the conductor can partially overlap each other via the conductor.

Further, in the invention described in claim 4,
When the conductor is supported on both sides of the conductor support, the conductor supports facing both sides of the conductor can be arranged on the same axis.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the conductor support of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a conductor support 3A of the present invention, and FIG.
It is a top view corresponding to (a), (b) is an AA sectional view of (a), (c) is a front view of (a).

In FIG. 1, the insulating resin 4 of the conductor support 3A has a pair of internal thread 5A embedded in the rear of the back surface thereof at intervals X, and in front of the front surface of the insulating resin 4 similarly with the internal thread. The embedded metal 5A is embedded symmetrically with the embedded female screw on the rear side at an interval Y in the plan view (Note: the surface of each embedded metal projects about 1 mm beyond the surface of the insulating resin 4).

Here, the arrangement dimensions X and Y of the threaded metal 5A for arrangement on the front and back of the conductor support 3A are determined under the following conditions. (1) The gap X between the left and right female threaded paddles 5A allows tightening work with a tightening tool that tightens bolts inserted into conductors that are fastened to the conductor support 3A via the left and right female threaded paddles 5A. To be. That is, a wrench can be inserted and rotated, and the wrench can be rotated by 30 ° or more. (2) The distance Y between the front and back internal metal pad 5A is the thickness of the insulating resin layer that withstands the interphase voltage applied to the conductors attached to the front and rear internal thread 5A + diameter d of the internal thread 5A. That is all. In addition, a fold (not shown) is formed on the outer periphery of the insulating resin layer for extending the creepage distance, and unevenness is formed on the outer periphery of the female screw embedded metal 5A to increase the pulling force from the insulating resin 4. Therefore, the electric field strength due to the unevenness and the deterioration due to the corona discharge over a long period due to the electric field are also taken into consideration.

Therefore, FIG. 3 of the side view of FIG.
As shown in (b), by supporting the conductor 2 with the conductor support 3A, the interphase dimension T2 and the ground dimension T3 shown in FIG. 3B of the conductor 2 are reduced to the minimum required dimensions (dimensions required for insulation). Can be reduced.

Further, since the conductor supports 3A adjacent to each other with the conductor 2 interposed therebetween are arranged so that the embedded metal piece 5A is displaced,
The dimension for avoiding the interference with the bolt 7 can be shortened, respectively, and the support dimension W1 at one location can be shortened. Therefore, it is possible to reduce the space required for disposing the conductor of the ground circuit of the grounding device and the conductor disposed in the medium- and low-voltage switchgear.

The conductor support has a square shape in the plan view of FIG. 1 (a) because the buried metal is not vertically opposed to each other unlike the conventional conductor support. The four corners of the square are also chamfered from the mold release after molding the molding resin. The same applies to each side of the square.

FIG. 2 is a diagram showing another embodiment of the conductor support of the present invention, in which the arrangement of the embedded metal with female screw is changed from the parallel arrangement shown in FIG. Is a plan view, (b) is a sectional view taken along line BB of (a), and (c) is a front view of (a).

In this case, the distance between the bolts for tightening the conductor 2 is doubled as compared with the conductor support 3A shown in FIG. 1, so that the insulating resin 4 may be used depending on the application (Note: when the conductor width is narrow). It has the advantage that it can be made smaller and the nominal diameter of the bolt can be increased.

4A and 4B are views showing another embodiment of the conductor support of the present invention. FIG. 4A is a plan view, FIG. 4B is a sectional view taken along line CC, and FIG. It is a front view. In FIG. 4, a female screw embedded metal 5A is embedded on one side of the back surface of the insulating resin 4 as in FIG. 1, but the surface of the insulating resin 4 is convex in (b) and (c). A character-shaped screwless metal 5B is embedded by protruding the convex portion 5b. This conductor support 3C can be used as shown in FIG. 6 described later in combination with the conductor support 3D described later in FIG.

5A and 5B are views showing still another embodiment of the conductor support of the present invention. FIG. 5A is a plan view, FIG. 5B is a sectional view taken along the line DD of FIG. 5A, and FIG. It is a front view of a). In FIG. 5, in place of the metal screw embedded metal 5A on the back surface side of the conductor support 3C shown in FIG. 4, a screwless metal embedded 5B embedded in the front surface of FIG. 4 is embedded.

FIG. 6 shows a case where the conductor support 3C shown in FIG. 4 and the conductor support 3D shown in FIG. The figure shows a case in which the conductors 2A for three phases are supported via the support metal 6 in the shape of a letter.

In FIG. 6, (a) is a plan view, (b) is an exploded view showing the assembly process as seen from the side of (a), (c).
[Fig. 7] is a side view of Fig. 9A after assembly is completed. In FIG. 6, in FIG. 6A, the leftmost conductor 2A (see FIG.
In (b) and (c), the rear end conductor 2A) is fixed to the ground potential attachment portion 1 with the two bolts 7 and the conductor support 3C, and then, to the right side of the conductor 2A in FIG. 6 (a), Figure 5
The conductor support 3D shown by is inserted into a not-shown buried metal insertion hole formed in the conductor 2A.

Next, the conductor 2 is placed on the right side of the conductor support 3D, and the screwless metal 5 is projected on the right side of the conductor support 3D.
It is arranged by inserting it into the convex portion of B, and on the right side of this conductor 2A, the screwless metal 5B of the conductor support 3C shown in FIG.
6 is inserted, and an L-shaped support metal 6 shown in FIG. 6 is fixed to the right side of the screwless metal 3C with a bolt 7. Finally, the support metal 6 is pressed against the conductor support 3C, and is fastened to the welding nut welded to the ground potential mounting portion 1 with the bolt 13.

In this case, since the projections 5b of the screwless metal 5B embedded in the conductor support 3C and the conductor support 3D are fitted to the conductors 2A, the conductors 2 shown in FIG. 3 are formed. Although a mounting hole larger than the bolt tightening hole is formed, the bolt tightening work is significantly reduced compared to the conductor arrangement shown in FIG. 3, so the switch gear assembly time should be reduced. There is an advantage that can be.

Further, as shown in FIG. 6 (c), each conductor support 3C and each conductor support 3D are arranged side by side in a line, and the conductor support portions of the prior art shown in FIG. Since the width W2 can be significantly reduced, the space required for arranging the conductor of the ground circuit of the grounding device of the gas-insulated switch gear and the conductor of the medium- and low-voltage switch gear can be significantly reduced.

In the above embodiment, the conductor for the ground circuit of the gas insulated switchgear and the conductor of the medium / low voltage switchgear have been described, but a conductor support for supporting conductors arranged in other low / middle / high voltage switchgears. It can also be applied to applications, and the space occupied by the conductors of these switchgears can be reduced, which contributes to the downsizing of the switchgear's outer shape and the installation floor area. it can.

[0038]

As described above, according to the invention of claim 1,
In a conductor support in which a metal pad is embedded in parallel surfaces of both ends of the insulating layer and supports a strip-shaped conductor on one or both sides, a metal surface of one surface of the parallel surface is embedded on one side of one surface, and a parallel surface is formed. By supporting the conductor on both sides of the conductor support by embedding the conductor on the other side symmetrically with the conductor on one side, part of the conductor supports placed on both sides of the conductor support must be inserted through the conductor. Since they can be overlapped with each other, it is possible to obtain a conductor support that can reduce the space for arranging the conductor without lowering the strength withstanding the electromagnetic force applied between the phases.

According to a second aspect of the present invention, in a conductor support in which a metal-filled metal pad is embedded in parallel surfaces of both ends of an insulating layer, and a strip-shaped conductor is supported on one side or both sides, Support the conductor on both sides of the conductor support by embedding the buried metal on one side of the parallel surface on one side of the one side, and the buried metal on the other side of the parallel surface symmetrically with the one side In this case, since it was possible to overlap a part of the conductor supports arranged on both sides of the conductor via the conductor, it is possible to reduce the space for arranging the conductor without lowering the strength to withstand the electromagnetic force applied between the phases. It is possible to obtain a conductor support capable of

According to the third aspect of the present invention, in the conductor support in which the buried metal is embedded in the parallel surfaces at both ends of the insulating layer and the strip plate-shaped conductor is supported on one side or both sides, the insulating layer is formed. By forming a flat pillar and embedding the parallel metal on one surface on one side and the parallel metal on the other surface on the other surface symmetrically with the one surface metal, When supporting the conductors on both sides, it was possible to overlap a part of the conductor supports arranged on both sides of the conductors via the conductors, so that the conductors can be arranged without decreasing the strength to withstand the electromagnetic force applied between the phases. It is possible to obtain a conductor support that can reduce the installation space.

Further, in the invention according to claim 4, in a conductor support in which a buried metal is buried in parallel surfaces of both ends of the insulating layer and one or both surfaces support a strip-shaped conductor, at least the buried metal is included. By making one side of the convex shape, embedding the one side of the parallel surface embedded in one side, and the other side of the parallel surface embedded in the other side symmetrically with the one side of the embedded metal, When supporting the conductor on both sides of the conductor support, the conductor supports facing both sides of the conductor can be arranged on the same axis,
It is possible to obtain a conductor support that can reduce the space for disposing the conductor without lowering the strength withstanding the electromagnetic force applied between the phases.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a conductor support of the present invention,
(A) is a plan view, (b) is a sectional view taken along the line AA of (a),
(C) is a front view of (a).

2A and 2B are views showing another embodiment of the conductor support of the present invention, FIG. 2A is a plan view, FIG. 2B is a sectional view taken along line BB of FIG.
(C) is a front view of (a).

FIG. 3 is a diagram showing the operation of the conductor support of the present invention,
(A) is a plan view, (b) is a right side view of (a).

4A and 4B are views showing another embodiment of the conductor support of the present invention, wherein FIG. 4A is a plan view, FIG. 4B is a sectional view taken along line CC of FIG. 4A, and FIG. Fig.

5A and 5B are views showing still another embodiment of the conductor support of the present invention, in which FIG. 5A is a plan view and FIG. 5B is DD of FIG.
Sectional drawing, (c) is a front view of (a).

6A and 6B are views showing an operation different from that of FIG. 3 of the conductor support of the present invention, FIG. 6A is a plan view, FIG. 6B is an exploded view seen from the right side of FIG. 6A, and FIG. Right side view.

FIG. 7 is a view showing an example of a conventional conductor support, (a)
Is a plan view, (b) is a cross-sectional view taken along line EE of (a).

FIG. 8 is a view showing the action of a conventional conductor support, (a)
Is a plan view, (b) is a right side view of (a).

[Explanation of symbols]

1 ... Ground potential mounting part, 2, 2A ... Conductor, 3A, 3B, 3
C, 3D ... Conductor support, 4 ... Insulating resin, 5A ... Female screw embedded metal, 5B ... Screwless embedded metal, 6 ... Support metal, 7 ... Bolt.

Claims (4)

[Claims] 1. A conductor support having buried metal embedded in parallel surfaces of both ends of an insulating layer and supporting strip-shaped conductors on one or both surfaces, wherein one surface of the parallel surface is replaced with metal on one side. And a buried metal on the other surface of the parallel surface is symmetrically buried on the other surface. 2. In a conductor support in which a female screw embedded metal is embedded in parallel surfaces of both ends of an insulating layer, and a strip plate-shaped conductor is supported on one side or both sides, the metal embedded on one side of the parallel surface is A conductor support, wherein the conductor support is embedded on one side of one surface and the other surface of the parallel surface is embedded symmetrically with the other surface of the other surface. 3. In a conductor support in which metal is embedded in parallel surfaces of both ends of an insulating layer and which supports a strip-shaped conductor on one side or both sides, the insulating layer is formed into a flat columnar shape, and A conductor support characterized in that one side of the buried metal is buried on one side of the one side, and the other side of the parallel surface is buried symmetrically on the other side. 4. A conductor support having buried metal embedded in parallel surfaces of both ends of an insulating layer and supporting a strip-shaped conductor on one or both sides, wherein at least one surface side of the embedded metal is convex. A conductor characterized in that one side of the parallel surface is embedded in one side of the one side, and another side of the parallel surface is embedded in the other surface symmetrically with the one side. support.