JPH0646162Y2 - Electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to improvement of electric equipment useful when a bare overhead wire is directly drawn into a gas-insulated switchgear or the like via a bushing.

(Prior Art) In general, a high-voltage bare overhead wire is provided inside a device case 4 through a conductor pull-out rod 3 of a bushing 2 directly connected to a gas-insulated switchgear 1, as shown in FIGS. 3 and 4. It is directly connected and drawn into the electric device body (not shown) housed in.

The bushing 2 is provided so as to seal the opening 5 of the device case 4, and the upper part of the conductor pull-out rod 3 arranged at the center of the bushing 2 is an overhead wire (not shown), and the lower part is the lower part. It is electrically connected to the charging unit 6 of the electric device body.

On the other hand, in the device case 4 and the bushing 2 described above, the insulation distance between the charging part and the device case (between different phases in the case of three phases) is shortened to reduce the size of the entire device case.
SF ₆ gas 7 is pre-filled at the factory.

In the figure, reference numeral 8 is a conductive disc electrically connected to the overhead wire, 9 is a connecting portion between the conductor pull-out rod 3 and the disc 8, and 10 is a conductor pull-out rod 3 and a charging portion 6 of the electric device body. And 11 indicates a shield.

(Problems to be solved by the invention) However, in the gas-insulated switchgear 1 having such a configuration, SF ₆ gas 7 is contained in the equipment case 4 and the bushing 2.
Since the gas-insulated switchgear 1 is carried into the site in a state where the bushing 2 is enclosed, that is, in a state where the bushing 2 is directly connected to the upper part of the equipment case 4, there is a drawback that the bushing 2 becomes an obstacle in transportation.

Therefore, as shown in FIG. 5, the electrical equipment body (not shown) is electrically connected to the electrical equipment body on the outer surface of the equipment case 4'which encloses the insulating fluid 7 therein. It is proposed that the female connector 12 is exposed in an airtight manner, and a conductor lead-out rod 14 of a bushing 13 that is detachably directly connected to the equipment case 4'is plug-in connected to the female connector 12.

(Problems to be solved by the invention) However, in the gas-insulated switchgear having such a configuration, the dimension W in FIG. 5, that is, the insulation distance between the conductor lead-out rod 14 and the equipment case 4'which is the ground potential is sufficiently secured. Therefore, there is a problem that the outer diameter of the bushing 13 becomes larger than necessary as the voltage becomes higher.

The present invention has been made to solve the above-mentioned conventional drawbacks, and it is possible to carry electrical equipment such as a gas-insulated switchgear to the site without directly connecting the bushing. An object is to provide an electric device that can be directly connected to a device case easily.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention is directed to an outer surface of a device case that encloses an electric device body and encloses an insulating fluid inside the device case.
In an electric device in which a female connector electrically connected to the electric device main body is exposed in an airtight manner, and a conductor withdrawing rod of a bushing that is removably directly connected to the device case is plug-in connected to the female connector. A spindle-shaped insulating unit having a conductive treatment layer on the outer periphery of its central portion is mold-deposited on the outer periphery of the lower portion of the conductor extraction rod, and electric field relaxation treatment is applied to the upper and lower ends of the conductive treatment layer. It is characterized in that a section is provided.

(Operation) In the present invention, as described above, the female connector electrically connected to the main body of the electric device is airtightly exposed on the outer surface of the device case, and the female connector with the insulating unit forming the bushing is provided. Since the lower end of the conductor pull-out rod can be attached by a plug-in method, it is possible to seal gas etc. on the equipment case side without directly connecting the bushing, which in turn eliminates transportation obstacles such as gas insulated switchgear. .

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a gas insulated switchgear 15 according to an embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of an essential part of an electric device such as the above.

In the figure, for example, three openings 17 are provided in the upper part of a device case 16 that encloses an electric device body (not shown) such as a circuit breaker or a disconnector, and the openings 17 are recessed portions 18 It is hermetically sealed with a sealing body 19 having.

The sealing body 19 has a small bushing 21 such as an epoxy sleeve having a flange 20 on the large diameter side, and an opening on the small diameter side of the small bushing so as to hermetically seal the opening with an epoxy mold or the like. The charging section 22 provided on the
And a female connector 24 in which one shoulder portion of the charging portion 22 is held in contact with the boss 23.

The female connector 24 is composed of, for example, a plurality of contacts 25 having a concave cross section, and a garter spring 26 wound around the outer periphery of a cylindrical arrangement of these connectors, and the inner diameter of itself is a diameter. It is designed to expand and contract in the direction.

The above sealing body 19 is attached to the device case 16 as follows. That is, the flange 20 of the small bushing 21 is brought into contact with the inner wall of the peripheral edge of the opening 17 of the device case 16 via the packing 27, and the flange 20 and the inner wall of the device case 16 are integrated with each other by bolts (not shown) equally arranged in the circumferential direction. Turn into.

The opening 17 of the device case 16 is hermetically sealed as described above.

Then, in the factory, after the insulating fluid 28 such as SF ₆ gas is sealed in the equipment case 16 and the opening 17 is closed by the blind plate 29, in this state, that is, in the state where the bushing described later is not directly connected to the opening 17. Bring in electrical equipment such as gas insulated switchgear 15 to the site.

Next, a method of directly connecting the bushing to the gas-insulated switchgear 15 and the like brought into the field will be described.

First, as shown in FIG. 2, a spindle-shaped insulation unit 32, which is a solid insulation having a higher dielectric strength than gas insulation, is mold-deposited on the outer periphery of the rod-shaped conductor extraction rod 30 at a slightly lower position.
A peripheral groove 31 is formed on the outer periphery of the central portion of the insulating unit 32, and a conductive treatment layer 33 is formed on the outer surface of the peripheral groove 31 by applying a conductive paint or the like. here,
The reason why the peripheral groove 31 is formed on the outer periphery of the central portion of the insulating unit 32 and the conductive treatment layer 33 is formed on the outer surface of the peripheral groove 31 will be described. First, in order to alleviate the concentration of the electric field generated in the equipment case 16 which is the earth potential, a conductive treatment layer 33 is provided on the outer surface of the insulating unit 32 arranged in the vicinity of the equipment case 16 to apparently extend the earth portion. There is a need. Then, when the conductive processing layer 33 is formed on the outer periphery of the insulating unit 32, the electric field concentrates on the upper and lower ends of the conductive processing layer 33. It is necessary to bend them so as to face each other to form a stress cone, that is, an electric field relaxation treatment section. As described above, when the conductive treatment layer 33 is formed on the outer periphery of the central portion of the insulating unit 32, it is necessary to form the electric field relaxation treatment portion on the upper and lower end portions thereof, and as a result, the central portion of the insulating unit 32 is formed. A circumferential groove 31 is inevitably formed on the outer circumference. The insulating unit 32 can be formed of a molding material such as epoxy resin or ethylene propylene rubber.

Next, the blind plate 29 is removed to expose the female connector 24, and the female connector 24 is plugged in with the plug 34 attached to the lower end of the conductor pull-out rod 30 by crimping or the like, and the bushing 35 is configured. An annular bottom plate 37 fixed to the bottom of the porcelain insulator 36 is brought into contact with the outer wall of the peripheral edge of the opening 17 via a packing 38, and the annular bottom plate 37 is fixed to the outer wall of the equipment case 16 by bolts (not shown) equidistantly arranged in the circumferential direction. To do.

Then, the upper end of the conductor lead-out rod 30 which is inserted into the insertion hole 39 of the upper metal fitting 38 provided on the top of the porcelain bushing 36 and temporarily fixed is fixed with the clamp 40, and the conductive treatment layer 33 of the insulating unit 32 is fixed. The outer periphery is supported by a ring-shaped support metal fitting 42 which is attached to the equipment case 16 and has a split structure. As a result, the equipment case 16 that is the ground potential and the conductive processing layer 33 of the insulating unit 32 are
And are held at the same potential. Next, for example, an insulating fluid 28 'such as SF ₆ gas is sealed in the bushing 35 through the connector 41 provided on the upper fitting 38.

In the figure, reference numeral 43 is a rain cover, 44 is an embedded metal fitting, and 45 is packing.

In addition, in the above-mentioned embodiment, the case where the concave portion 18 is provided in the upper portion of the device case 16 is described, but the present invention is not limited to this, and for example, the outer surface of the device case 16 having no concave portion. The female connector 24 may be airtightly exposed to
In addition, SF enclosed in the equipment case and / or bushing
₆ Insulating oil may be filled instead of the gas. Further, in the present invention, an electric device such as a transformer may be housed instead of the switch housed in the device case.

[Effects of the Invention] As described above, according to the present invention, the gas case switchgear can be sealed without directly connecting the bushing to the electric device such as the gas-insulated switchgear. Obstacles when transporting electric devices can be eliminated.

Further, in the present invention, a spindle-shaped insulating unit 32 having a conductive treatment layer 33 on the outer periphery of its central portion is mold-deposited on the outer periphery of the lower position of the conductor drawing rod, and the upper and lower end portions of the conductive treatment layer 33 are attached to the upper and lower ends thereof. Since the electric field relaxation processing section is provided, there is an advantage that the insulation distance between the equipment case, which is the earth potential, and the conductor pull-out rod can be shortened as compared with the gas insulated switchgear of FIG. Further, compared with the gas-insulated switchgear shown in FIG. 5 in which the entire voltage is shared only by the insulating fluid, there is an advantage that the insulation performance is more stable and the reliability is further improved.

[Brief description of drawings]

1 is a main longitudinal sectional view of an electric device such as a gas-insulated switchgear according to the present invention, FIG. 2 is a longitudinal sectional view of an essential part showing a state in which a bushing is directly connected to the device case of FIG. 1, and FIG. And FIG. 5 is a schematic explanatory view of a conventional gas-insulated switchgear, and FIG. 4 is an enlarged cross-sectional view of a direct connection portion of the bushing of FIG. 15 …… Gas insulated switchgear 16 …… Equipment case 17 …… Opening 18 …… Recess 19… Sealing body 24 …… Female connector 28, 28 ′ …… Insulating fluid 29 …… Blind plate 30 …… Conductor lead-out rod 31 …… Circumferential groove 32 …… Insulation unit 33 …… Conductive treatment layer 35 …… Bushing 36 …… Insulator

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hideo Yoshikawa 2-1 1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Showa Cable Denki Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A female connector electrically connected to the electric device body is airtightly exposed on an outer surface of a device case that encloses the electric device body and encloses an insulating fluid therein, and the female connector is electrically connected to the electric device body. In an electric device in which a conductor pull-out rod of a bushing that is detachably directly connected to the device case is plugged in, an outer periphery of a lower position of the conductor pull-out rod is provided with a conductive treatment layer on the outer periphery of its own central portion. A spindle-shaped insulating unit having is mold-deposited, and the upper and lower ends of this conductive treatment layer are
An electric device comprising an electric field relaxation processing section. 2. An opening provided in an upper part of a device case,
The electric device according to claim 1, characterized in that the electric device is sealed with a sealing body having a recess, and a female connector is arranged at the bottom of the recess of the sealing body.