JP2017204430A - Conductor support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cheap conductor support device capable of being solidly fixed to a large electromagnetic force between conductors generated by a large current passage such as during system short-circuiting, of making a specific work unnecessary to a conductor or a fixing frame, and of reducing the number of screw holes and fastening positions.SOLUTION: A conductor support device includes a support insulator 1 having an insulation part 2, a first embedding member 3 embedded in the other end of the support insulator 1 and projected partly from the support insulator 1, and a second embedding member 4 embedded in one end of the support insulator 1 and partly projected from the support insulator 1, in which the first embedding member 3 has a screw groove 3c in the circumference of a columnar square column fitting to a square hole formed on the support member 5, and the second embedding member 4 has a square columnar shape fitting to a square hole formed on the conductor 7 and had a screw hole 4d at a center.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conductor support device that insulates and supports a conductor through which a high-voltage current flows, such as a switch gear, from a frame.

In addition to high reliability and downsizing of electrical equipment such as switchgear, it has become a global manufacturing base in recent years, such as higher manufacturing efficiency such as further ease of assembly during manufacturing and quality creation by unskilled workers. There are demands for handling and ease of disassembly and separation at the time of renewal disposal due to aging.
An electrical device such as a switchgear includes a conductor support device that insulates and supports a conductor through which current flows from a frame of a casing or a frame.
The conductor support device normally passes a current of several tens to several thousand A (amperes) at a voltage of several hundreds to several tens of thousands of volts (volts). However, when there is a lightning strike on the electric circuit, When a short circuit accident occurs, a surge voltage more than several times or an abnormal current of several tens of thousands to several hundred thousand A flows through the conductor. A mechanically durable performance is required.
In particular, the electromagnetic force generated between the conductors due to a large current that flows, such as when an electrical circuit short-circuit occurs, can result in a load of several thousand N (Newton) on the conductor support device. In order to prevent the danger of secondary disasters associated with, it is necessary to make it extremely strong.
Conventionally, indoor resin post insulators are commercially available as the conductor support device as described above, and a model corresponding to the required performance is selected and applied to the conductor support of electrical equipment such as switch gears.
With conventional resin post insulators for indoor use, various screw holes may cause troublesome parts management depending on the direction of the screw hole, assembly work management, and insulation deterioration due to corona discharge depending on the usage method. Those having high mechanical strength for securing the electromagnetic strength strength have a problem that the number of screw holes and the number of fastening bolts are large and the number of man-hours for assembly work is large.
In order to solve this problem, the conventional insulation support device shown in Patent Document 1 is provided with a protruding portion separately from the screw hole portion on the conductor and the frame, and provided with a hole that fits into each protruding portion, or an insulating insulator. By providing a protrusion on the conductor and a hole that fits the protrusion on the conductor and frame side, the conductor and insulation insulator, and the insulation insulator and frame are prevented from rotating, reducing the number of screw holes and bolts as a countermeasure against rotation In order to prevent insulation deterioration due to the occurrence of corona discharge in a minute gap between the conductor and the portion of the metal fitting that is not fixed to the conductor, there is no filler metal other than the conductor clamp. It is intended to eliminate.
However, this requires processing to provide a protrusion different from the screw hole on the conductor or frame, or processing of a hole that fits into the protrusion of the insulation insulator, and there are many problems with parts processing. Formed as a detent for preventing the relative rotational movement that occurs when the electromagnetic force applied to the conductor acts as a twist of the insulation when a short-circuit large current is applied, such as from 10 kiloamperes to over 100 kiloamperes. There is a problem that it is difficult to secure shear strength that can withstand the load in the shear direction applied to the protruding structure portion.
Furthermore, when fixing an insulated conductor (a conductor coated with an insulating coating), corona discharge may occur in a minute gap generated between the fixing bolt and the insulating coating. As is known, there is a problem that the work of applying a conductive paint is necessary, particularly when the current carrying capacity is large, and when assembling using a plurality of insulated conductors, the work is further complicated.
In addition, as a method of increasing the mechanical strength while reducing the number of screw holes and the number of fastening bolts, a high-strength material is used for the material of the filling metal fittings and bolts of the screw hole portion. The resin of the metal fitting part, which is a part that requires electrical insulation performance and a part that requires high mechanical strength, is cast integrally with a resin material with high mechanical strength. For this purpose, in addition to the general one-type resin casting equipment, a special casting equipment equipped with a mixing tank and an injection device for multiple types of resin and its management device is necessary. Expenses for capital investment and maintenance of the equipment were necessary, and there were problems in terms of economy such as total production efficiency and equipment utilization efficiency.

JP-A-8-287756 (paragraph 0024, FIG. 1) Japanese Utility Model Publication 62-78008 (Page 3, [Action], Fig. 3) JP 58-158810 (Page 3, drawing)

  The conventional insulation support device as described above is a structural support between a conductor and an insulation insulator and between an insulation insulator and a fixed frame, and is fixed by fixing at least one fastening bolt at each end of the insulation insulator. Although work has been simplified and streamlined, in addition to this, when a load in the torsional direction is applied to the conductor, such as electromagnetic force generated when a large current flows through the conductor, the relative rotational movement of each connection is prevented. However, it is necessary to work with a fitting portion for a protrusion and a hole to form a detent structure, and the processing of the conductor and the fixed frame is complicated and expensive. In addition, when fixing the insulated conductor, there is a problem that the application work of the conductive paint is complicated in order to prevent the generation of corona. In either case of the bare conductor or the insulated conductor, the insulation deterioration due to corona discharge or screw The complexity of component management due to the direction of the hole can be eliminated, and it can be firmly fixed against the large electromagnetic force between the conductors generated by energizing a large current when the system is short-circuited, and no special processing is required on the conductors or fixing frame. Thus, it has been a problem to obtain an inexpensive conductor support device that can reduce the number of screw holes and fastening locations.

  The conductor support device according to the present invention includes an insulating support insulator having an insulating portion, a first embedded member embedded in the other end of the insulating support insulator, a part of which protrudes from the insulating support insulator, and the insulating support insulator. A second embedded member that is embedded in one end of the insulating member, and a part of the first embedded member protrudes from the insulating support insulator, and the first embedded member is in the shape of a prism that fits into a square hole formed in the support member. Has a thread groove, and the second embedded member has a prismatic shape that fits into a square hole formed in the conductor and has a threaded hole in the center.

  According to the present invention, an insulating support insulator having an insulating portion, a first embedded member embedded in the other end of the insulating support insulator, a part protruding from the insulating support insulator, and an end of the insulating support insulator A second embedded member embedded and partially projecting from the insulating support insulator; and the first embedded member is a prismatic shape that fits into a square hole formed in the support member, and there is a screw around the prism. Since the second embedded member has a rectangular columnar shape that fits into a square hole formed in the conductor and has a screw hole at the center, the second embedded member has a groove between the conductors generated by energizing a large current when the system is short-circuited. It is possible to obtain an inexpensive conductor support device that can be firmly fixed against a large electromagnetic force, does not require special processing on the conductor and the fixing frame, and can reduce the number of screw holes and fastening points.

Insulation support insulator Right side view of the insulating support insulator shown in FIG. Left side view of the insulating support insulator shown in FIG. Assembly drawing showing a bare conductor insulation supporting device according to the present invention Assembly drawing showing an insulation support device for two bare conductors according to the present invention Assembly drawing showing insulation support device for insulated conductor according to the present invention Assembly drawing showing an insulation support device for two insulated conductors according to the present invention Washer with protrusion of insulation support device for insulated conductor of the present invention Side view of the washer with protrusion shown in FIG. Another form of insulating support insulator according to the present invention. Right side view of the insulating support insulator shown in FIG. Left side view of the insulating support insulator shown in FIG.

Embodiment 1
In FIG. 1, 1 is an insulating support insulator according to the present invention, FIG. 2 is a right side view thereof, and FIG. 3 is a left side view thereof. 2 is an insulating part that constitutes the main body of the insulating support insulator 1, and is generally thermosetting resin such as epoxy resin or polyester resin, or thermoplastic resin, depending on the required electrical insulation performance and mechanical strength, Alternatively, it is made by casting or molding with a material in which a reinforcing material such as glass fiber is mixed with those resins to increase the strength. Reference numeral 3 denotes a component for fixing one side of the insulating support insulator 1 to a frame or the like, in a first embedded member, that is, a frame fixing portion, a portion 3a embedded in the insulating portion 2, and a square hole formed in the support member, that is, the frame. It is comprised by the substantially square column part 3c and the columnar screw part 3b to fit. 4 is a component part for attaching a conductor to the surface opposite to 3 on the other side of the insulation support insulator 1, a second embedded member, ie, a buried metal fitting of the conductor fixing portion, a portion 4 a embedded in the insulating portion 2 and the insulating portion 2 is provided with a substantially prismatic part 4b that fits into a rectangular hole formed in the conductor, and one or more triangular pyramidal protrusions 4c are provided on the surface of the prismatic part 4b, and a screw hole 4d is formed at the center. It is a buried bracket. Since the filling metal 4 does not hinder the energization capacity of the bare conductor 7 to be described later, the square hole formed in the bare conductor 7 is made as small as possible, so a small metal such as iron, brass, aluminum, etc. with high mechanical strength. It is good to make it.

  The frame fixing part 3 is firmly fixed to the resin of the insulating part 2 by a method such as adhesion at the time of casting or molding of the insulating part 2 at the embedded part 3a, and a part 4a in which the buried metal fitting 4 of the conductor fixing component part is also embedded. The insulating portion 2 is also firmly fixed by a method such as adhesion to the resin of the insulating portion 2 at the time of casting or molding, and a predetermined mechanical strength is secured with respect to the external force in each drawing direction and twisting direction. ing.

FIG. 4 is a view showing an insulating support device according to the present invention, and shows a state in which an insulating support insulator 1 is fixed to a frame 5 with a nut 6 and a bare conductor 7 is fixed. Although not shown, the frame 5 is formed with a square hole that fits into a substantially prismatic part 3c formed by protruding from the insulating part 2 in the frame fixing portion 3 of the insulating support insulator 1, and the square hole is formed into a substantially rectangular pillar. The portion 3 c is fitted, and the screw groove, that is, the columnar screw portion 3 b is fastened with the nut 6, so that it is firmly fixed.
The insulating part 2 is mainly selected from resin materials with excellent electrical insulation characteristics including tracking resistance and arc resistance, and the frame fixing part 3 is sized according to the required mechanical strength (the mechanical strength is (In particular, the thread diameter of the columnar thread part dominates) and metal processed products such as iron, aluminum, brass, etc., thermosetting resin, molded products of thermoplastic resin, and cast products can be selected. Insulation support insulators that are optimal in terms of quality can be obtained.
In the conductor 7, a square hole (not shown) is formed in the metal fitting 4 of the conductor fixing portion of the insulating support insulator 1 to be fitted into the substantially prismatic part 4 b formed protruding from the insulating portion 2. The conductor 7 can be firmly fixed to the insulating support insulator 1 in a non-rotatable manner by fitting the substantially prismatic part 4 b and fastening with the fastening bolt 8. 9 is a washer. At this time, one or more triangular pyramidal projections 4 c formed on the plane of the substantially prismatic part 4 b of the conductor fixing part 4 of the insulating support insulator 1 bite into the surface of the square hole of the conductor 7, thereby further strengthening. Although there is an effect of preventing the rotation deviation of the conductor, the protrusion 4c exhibits its original purpose effect when an insulated conductor described later is fixed. Details will be described later.

  Since this conductor support device is configured as described above, the conductor and the insulation support insulator are one bolt, the insulation support insulator is one nut on the frame, and the conductor is short-circuited with a large current. Even when a large bending force or a force that rotates the conductor is applied to the insulating support insulator, an electromagnetic force is generated, and the rotation of the conductor and the loosening of the fastening portion are firmly prevented. The optimum material for the insulating portion 2 and the material for the frame fixing portion 3 and the combination thereof are selected in accordance with the required electrical and mechanical performance of the insulating support insulator 1. Can be obtained economically and inexpensively.

  FIG. 5 is a view showing a conductor support device showing a state in which the spacer 10 is fixed between the two conductors 7. The conductor is a bare conductor. What is shown with the same number is the same or equivalent member. The fastening bolt 11 is longer than the fastening bolt 8 by the thickness of the conductor 7 and the spacer 10.

FIG. 6 is a diagram showing a conductor support device in the case of an insulated conductor, 12 is an insulated conductor, and 12a is an insulation coating. The insulating coating 12a covers a portion other than the conductive connection portion of the conductor with an insulating tube or an insulating resin. In this portion, since the insulating coating 12a is interposed between the metal of the conductor fixing portion 4 of the insulating support insulator 1 and the metal of the conductor 12, the conductor 12 and the bolt 8 are provided between the insulating coating and the metal portion of the conductor fixing portion 4. The triangular pyramidal projection 4c formed on the conductor fixing portion 4 cuts into the metal portion of the insulating conductor 12 so that a minute metal space is not generated between them. The metal part of the part is set to the same potential. Thereby, deterioration of the insulating support insulator 1 and the insulating coating 12a can be prevented.
The protrusion is not limited to a triangular pyramid shape, and may be a polygonal pyramid shape such as a quadrangular pyramid or a conical shape.

  FIG. 7 is a view showing a conductor support device showing a state in which an insulating spacer 13 is fixed between two insulating conductors 12. In this case, the insulated conductor 12, the fastening bolt 11, and the conductor fixing portion 4 of the insulating support insulator 1 are set to the same potential by the washer 14 with the triangular pyramid projection. 8 and 9 show examples of the washer 14 with the triangular pyramid protrusion. 14a is a seat surface portion that protects the bolt head and the seat surface of the insulated conductor, 14b is a rectangular column portion that fits into a bolt hole (not shown) formed in the insulated conductor 12, and 14c is when the tightening bolt is tightened. Triangular pyramidal protrusions 14d formed by cutting the insulation coating 12a of the insulated conductor 12 and biting into the metal part of the insulated conductor are bolt through holes. The portion 14b of the washer 14 with triangular pyramid-shaped protrusions that fits with the insulated conductor 12 is shown as a prismatic shape, but the portion 14d may be cylindrical.

Embodiment 2
The insulating support insulator 15 shown in FIGS. 10, 11, and 12 can further enhance the load resistance in the rotational direction and the bending direction.
In FIG. 10, reference numeral 15 denotes a reinforced insulating support, 16 denotes an insulating portion thereof, and 17 denotes a frame fixing portion that enhances load resistance in the rotation direction and the bending direction. A groove is provided in the portion 17a embedded in the insulating portion 16 to strengthen the insulating portion and the pulling load resistance. Furthermore, the prismatic part fitted to the frame is increased to the required strength. By doing so, even if the frame fixing portion 17 is made of a thermosetting or thermoplastic resin material, a mechanically strong insulating support insulator can be obtained.
Furthermore, by using a dielectric material (insulator) such as a thermosetting or thermoplastic resin material for the frame fixing portion 17, without extending the overall length of the insulating support insulator 15 (distance from the frame fixing surface to the conductor mounting surface) Since the length of the internal embedding part 17a can be extended and the number of the grooves 17e can be increased, a stronger one can be obtained.
Further, a groove 18e is provided in a portion 18a embedded in the insulating portion 16 of the filling metal fitting 18 of the conductor fixing portion, and this also strengthens the insulating portion and the pulling load resistance.

DESCRIPTION OF SYMBOLS 1 Insulation support insulator 2 Insulation part 3 Frame fixing | fixed part, 3a Embedding part of frame fixing | fixed part, 3b Substantial prismatic part 3c Column-shaped screw part 4 Filling metal fitting of conductor fixing | fixed part, 4a Embedding part, 4b Square pillar part, 4c Projection part 4d Screw hole 5 Frame 6 Nut 7 Conductor (bare conductor)
8 Bolt 9 Washer 10 Spacer 11 Bolt 12 Insulated conductor, 12a Insulation coating 13 Spacer 14 Protruding washer, 14a Washer seat surface part, 14b Square pillar part, 14c Protrusion,
14d Bolt through hole 15 Reinforced insulation support insulator 16 Insulating part 17 Frame fixing part, 17a Embeding part of frame fixing part, 17b Square pillar part 17c Columnar screw part, 17d Cavity part, 17e Groove 18 Filling metal fitting for conductor fixing part, 18a Embedding Part, 18b prismatic part 18c protrusion, 18d screw hole, 18e groove

Claims (6)

An insulating support insulator having an insulating portion;
A first embedded member embedded in the other end of the insulating support insulator, a part of which protrudes from the insulating support insulator;
A second embedded member embedded in one end of the insulating support insulator, a part of which protrudes from the insulating support insulator;
The first embedding member has a prism shape that fits into a square hole formed in the support member, and has a screw groove around the prism.
The conductor support device according to claim 1, wherein the second embedded member has a prismatic shape that fits into a square hole formed in the conductor and has a screw hole at the center. 2. The conductor support device according to claim 1, wherein the second embedding member has a polygonal or conical protrusion on the prism. 3. The conductor support device according to claim 1, wherein the first embedded member is provided with a groove in a portion embedded in the insulating support insulator. 4. 4. The conductor support device according to claim 1, wherein the second embedded member is provided with a groove in a portion embedded in the insulating support insulator. 5. 5. The conductor support device according to claim 1, wherein the first embedded member is made of metal. The conductor support device according to claim 1, wherein the first embedded member is formed of an insulator.

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