JPH0549125A - Conductor connector - Google Patents

Abstract

PURPOSE:To get a conductor connector excellent in insulation performance and compact, concerning a conductor connector which connects the mutual main circuits of electric equipment inside the box storing the electric equipment. CONSTITUTION:One side of a metallic ring 18, the surface of which is covered with silicon gel 19, or a gel insulating layer 20 is molded integrally with a contact 15, which connects a connecting conductor 8 with an electrode 11 being the main circuit of electronic equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor connecting device for connecting a main circuit conductor of a gas insulated switchgear.

[0002]

2. Description of the Related Art In FIG. 3, which shows an example of a conventional gas-insulated switchgear to which a gas-insulated spacer is attached, the inside of a box 1 whose outer periphery is airtightly surrounded by a mild steel plate is located near the front side on the left side in the figure. A vertical partition wall 2 divides the circuit breaker chamber 1a in the front and the busbar chamber 1b in the rear, and each chamber is filled with sulfur hexafluoride gas (hereinafter referred to as insulating gas).

Of these, a circuit breaker 3 is housed inside the circuit breaker chamber 1a, an insulating spacer 9 described later is attached to a through hole (not shown) in the partition wall 2, and the front side of the insulating spacer 9 is connected to the circuit breaker 3. It is connected.

A disconnector 4A having a front terminal connected to a rear of an upper insulating spacer 9 through a connecting conductor 8 is attached to the ceiling of the bus room 1b.
The rear terminal portion is connected to a bus bar 5 attached to a rear insulator 6 via a connecting conductor 8.

On the other hand, a disconnector 4B having the same shape as the disconnector 4A, in which the front terminal is connected to the rear of the lower insulating spacer 9 via the connecting conductor 8, is attached to the bottom of the bus chamber 1b. The terminal portion at the rear of the disconnector 4B has a cable bed 7 vertically attached to the rear of the bottom plate via a connecting conductor 8.
Is connected to the upper end of.

FIG. 4 is a vertical sectional view of the gas insulating spacer 9 shown in FIG. In the figure, a through hole 10a is provided in a mounting plate 10 attached to the partition wall 2 by welding. Further, the insulating spacer 9 is fixed to the mounting plate 10 with a bolt 13 at a mounting portion on the outer periphery of an insulating portion 12 formed of an Epokin resin in a substantially disk shape on the outer periphery of the electrode 11. Further, the joint surface with the mounting plate 10 is kept airtight via an O-ring 14. Inside the electrode 11, the connection conductor 8 is provided from both directions.
And the fins of the connecting conductors 8 are inserted into the contact 1
5, etc., are respectively connected to a circuit breaker and a disconnector which are not shown. Here, in the contactor 15, a metal shield ring 16 having a large radius of curvature is fixed to the connecting conductor 8 by a bolt 17 as disclosed in JP-A-60-128807, in order to relieve an electric field at an acute angle portion. Has been done. The shield ring 16 is made of aluminum or the like.

[0007]

In such a conventional conductor connecting device, the shield ring 16 covering the contact 15 thus constructed needs a large radius of curvature in order to suppress the electric field strength on the surface. Yes, and the size increases accordingly. Since the insulating spacers 9 are attached in a horizontal single-row arrangement for the three phases, the shield ring 16 between the shield ring 16 and the box 1 becomes a space between the shield rings 16 and 16 when the shield ring 16 becomes large. Since the insulation distance is maintained at the required withstand voltage value, it is necessary to increase the interval for mounting the insulating spacer 9. Also, the insulation distance from the mounting plate 10 becomes shorter as the shield ring 16 becomes larger, and in order to maintain the required withstand voltage value, the through hole 10a must be widened and the insulation portion 12 must be enlarged accordingly. Disappear. Since the insulating gas is an electrically true gas and the breakdown voltage depends on the electric field strength, the radius of curvature of the shield ring 16 must be increased more and more as the rated voltage of the device increases, and the insulating spacer accordingly. 9 had the drawback of becoming larger. Although the optimum value that can be miniaturized can be obtained from the relationship between the size of the shield ring 16 and the effect of suppressing the electric field strength, there is a drawback that the miniaturization cannot be made larger than the optimum size. An object of the present invention is to provide a conductor connecting device which is excellent in insulation performance and is compact.

[0008]

In order to achieve the above-mentioned object, the present invention provides a conductor connecting device having a connecting portion for connecting a main circuit of an electric equipment housed in a box containing an insulating gas. Since one of the metal ring having the silicone gel layer on the surface or the silicone gel layer is integrally formed with the connection portion, the electric field strength at the connection portion is suppressed to improve the insulation performance and the size can be reduced. Become.

[0009]

Embodiments of the conductor connecting device according to the present invention will be described below with reference to the drawings. However, the same parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is an enlarged sectional view of the conductor connecting device of the present invention. In the figure, the insulating part 12 is formed integrally with the electrode 11 by casting, and the insulating part 1 is formed in the through hole 10 a of the mounting plate 10.
2 is penetrated and is fixed with a bolt 13 via an O-ring 14. Further, the connection conductor 8 is inserted into the electrode 11, and the fin is electrically connected by the contactor 15 to be connected to the circuit breaker 3 as in the conventional configuration.

Here, the metal ring 18 made of aluminum or the like is attached to the fin around the acute angle portion of the contactor 15. A silicone gel 19 having an insulating thickness of several mm is formed on the metal ring 18 and the connecting conductor 8 by brush coating, for example. Further, the metal ring 18 has an inner diameter slightly larger than the outer diameter of the contact 15 so as to cover the contact 15 with a minimum size, and does not easily move after mounting. Furthermore, the silicone gel 19 wraps and covers the connection conductor 8.

In these configurations, the metal ring 18
Is formed to have the smallest diameter, the through hole 10a
Does not significantly reduce the insulation distance. However, since the radius of curvature is small, an increase in the electric field strength on the surface can be seen. However, since the silicone gel 19 having a higher dielectric constant than that of the insulating gas is coated, the electric field strength on the surface of the silicone gel 19 decreases almost in inverse proportion to the magnitude of the dielectric constant. The silicone gel 19 is formed by mixing silicone oil and a curing agent to form a gel. For example, if the mixing ratio of these is 1: 1, the dielectric constant is about 2.7. As a result, the electric field strength on the surface of the silicone gel 19 decreases with the unequal electric field coefficient obtained from the electrode arrangement, so that the insulation characteristics can be improved. Further, the breakdown voltage when gelled at the above mixing ratio is about 45 kg / mm, and if there is an insulation thickness of several mm, it can be applied to, for example, a device with a rated voltage of 77 kg, and excellent dielectric strength can be expected. ..

The silicone gel 19 has a sugar-adhesive property and can fix the metal ring 18 and the connection conductor 8 to each other. When the circuit breaker 3 is pulled out at the time of inspection or the like, the elastic modulus is small and therefore the impact force is well absorbed, the occurrence of cracks can be prevented, and the metal ring 18 can be stably fixed. Further, since it is gel-like, the electrode 1 due to the eccentricity of the metal ring 18
Even when attaching and detaching 1, the error size is absorbed. As a result, a small-sized connection portion of the contactor 15 in which the electric field strength is suppressed can be formed, so that the device including the insulating spacer 9 can be downsized.

As another embodiment, as shown in FIG. 2, for example, if a glass tape is impregnated with a gel insulating layer 20 impregnated with silicone gel in a 1/2 wrap and is wound around the contactor 15, the contactor 15 is formed. Due to the relaxation of the electric field at the acute angle and the excellent dielectric strength of the silicone gel, it is possible to make a compact connection part with improved insulation characteristics. However, since the gel insulating layer 20 is peeled off when the contactor 15 is attached and detached, it is necessary to wind the gel insulating layer 20 every time when the contactor 15 is attached.

[0015]

As described above, according to the present invention, in the conductor connecting device having the connecting portion for connecting the main circuits of the electric devices housed in the box containing the insulating gas, the silicone gel layer is provided on the surface. Since one of the metal ring and the silicone gel layer is formed integrally with the connecting portion, it is possible to obtain a compact conductor connecting device while suppressing the electric field strength at the acute angle portion of the connecting portion and maintaining excellent insulation performance.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a conductor connecting device of the present invention.

FIG. 2 is an enlarged cross-sectional view showing another embodiment of the conductor connecting device of the present invention.

FIG. 3 is a configuration diagram of a typical gas-insulated switchgear.

FIG. 4 is an enlarged cross-sectional view of a conventional conductor connecting device.

[Explanation of symbols]

8 ... Connection conductor, 15 ... Contact, 18 ... Metal ring, 19 ... Silicon gel, 20 ... Gel insulating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiji Waku, 1-1 1-1 Shibaura, Minato-ku, Tokyo Inside the headquarters office of Toshiba Corporation (72) Kyofumi Nagata 1-1-1 Shibaura, Minato-ku, Tokyo Toshiba Corporation Head Office

Claims (1)

[Claims] 1. A conductor connecting device having a connecting portion for connecting main circuits of electric devices housed in a box in which an insulating gas is sealed, wherein one of a metal ring and a silicone gel layer having a silicone gel layer on a surface thereof. Is formed integrally with the connecting portion.