JPH073764Y2 - Disconnector for lightning arrester - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a surge arrester disconnector used in a gas-insulated closed switchboard.

(Prior Art) In FIG. 5 showing an example of a conventional gas-insulated closed switchboard, sulfur hexafluoride gas (hereinafter referred to as insulating gas) is provided inside.
A high-pressure vacuum circuit breaker 2 is housed in the front part of an airtight box 1 in which is sealed. Then, on the ceiling surface and the floor surface, the operation arm 3b is attached by the operation mechanism 3a attached to the rear operation room 1b.
The disconnectors 3A and 3B which are opened and closed by operating the are attached via the support insulator 8A, and the rear end of the disconnector 3B is connected to the upper end of the cable head 4.

Further, a bushing 6 to which an unillustrated extra-high voltage overhead wire is connected to the upper terminal is vertically and airtightly attached to the rear of the upper surface of the box body 1, and the lower terminal (not shown) of the bushing 6 is disconnected by a copper rod 7. In addition to being connected to the rear terminal of the container 3A, it is branched and connected to the connection terminal 9a attached to the rear partition 1a via the support insulator 8B.

Further, a lightning arrester 5 that protects internal equipment from a lightning impulse from an overhead wire (not shown) is vertically installed behind the floor surface,
As shown in FIG. 6 showing the details, the upper end of the disconnecting rod 5a1 protruding upward from the lightning arrester 5 is pressed by a spring (not shown) in the shield ring 9 attached to the rear partition 1a via the support insulator 8A. This contactor 9b is fitted to the contactor 9b
The upper end of is connected to the upper connection terminal 9a.

In the gas-insulated closed switchboard configured as described above, the lightning arrester 5 must be separated from the internal device when performing a withstand voltage test (especially verification of the insulation class by lightning impulse). Insulation rod for disconnecting rod
Pull 5a2 downward and disconnect the upper disconnect rod 5a1 from the shield ring 9
Pull out from. Then, as shown in FIG. 7, the upper end of the disconnecting rod 5a1 separates from the contact 9b and descends into the upper shield 5b above the lightning arrester 5, but the insulating rod 5a2 below the floor surface of the box 1 is the stroke. Sticks out from below.

[Problems to be solved by the invention]

Then, not only is it necessary to previously provide a deep hole for operating the insulating rod 5a2 on the installation surface of the box body 1, but also this place is poor in operability.

Furthermore, in the lightning arrester 5, a vertically moving disconnecting rod 5a1 and insulating rod 5a2
The structure of the contacting part with and becomes complicated and the outer shape becomes large, and the box 1 also becomes large.

Therefore, an object of the present invention is to provide a lightning arrester disconnector for a gas-insulated closed switchboard that has good operability and does not increase the outer shape of the box.

[Constitution of device]

(Means and Actions for Solving the Problem) The present invention has one pole connected to a lightning arrester provided in a gas-insulated switchboard and the other pole connected to a main circuit in the gas-switched switchboard and inserted inside. In a lightning arrester disconnecting switch that connects / disconnects between the electrodes with a disconnecting rod, a line side terminal with a concave cross-section having an insulating gas flow port on the end face is embedded in one end of a cylindrical insulator, and the intermediate part is It is easy to operate by embedding a cylindrical intermediate electrode that becomes another pole and inserting and disconnecting the line side terminal and the intermediate terminal from the other end through an insulating rod and the operation of the closed switchboard. This is a lightning arrester disconnecting switch that has been downsized.

(Embodiment) Hereinafter, one embodiment of a disconnector for a lightning arrester of a gas insulated closed switchboard according to the present invention will be described with reference to the drawings. However, the part overlapping with the fifth part is omitted.

In FIG. 1, a lightning arrester 11 without a control rod is vertically installed behind the floor surface of the box body 1, and above this lightning arrester 11, a lightning arrester disconnector 12 of the present invention, which will be described later, is attached to a rear partition 1a. Board
The intermediate electrode (not shown) at the lower center of the lightning arrester disconnector 12 is attached via a line 15, and is connected to a line side terminal (not shown) above the lightning arrester 11.

Further, the line side electrode at the left end of the arrester 12 for the lightning arrester is connected to a copper rod 7 connecting the bushing 6 for drawing the overhead wire attached to the upper surface of the box 1 and the disconnector 3A.

FIG. 2 is a half sectional view showing the details of the surge arrester disconnecting switch 12 (however, FIG. 1 has been moved clockwise by 90 °).

In Fig. 2, a cylindrical insulator 12 molded by casting with epoxy resin has a line-side terminal 12a with a concave cross section at one end.
Is projected and embedded at the end, and a U-shaped groove is provided on the concave inner wall of the line-side terminal 12a over the entire circumference. The groove is supported by a holding plate (not shown) and is inwardly moved by a spring (not shown). A plurality of pressed spherical contacts 13 are attached. A gas hole 12f that communicates with the inside is provided at the end protruding outward.

In addition, a cylindrical intermediate electrode 12b is embedded in the middle portion of the insulator 12d, a convex portion provided on the left side of the middle electrode 12b projects from the insulator 12, and a conductor wire connecting to the lightning arrester 11 is provided on the outer surface. , And a plurality of contacts 13 are attached to the inner wall in the same manner as the line side terminals 12a. Then, at the other end of the insulator 12d, four paddings 12c having female threads are embedded. Further, at the other end of the insulator 12d, large and small O-rings 16A and 16B on the insulator 12 side and a small diameter Y-direction packing 16C having a triple seal formed on the inner periphery of the central through hole are mounted. The mounting plate 15 of is attached via the embedded metal 12c.

Further, the other end of the glass fiber-containing insulating rod 12g having one end protruding to the other end of the insulator 12 is inserted inside the insulator 12d, and one end of a cylindrical connection disconnecting rod 12e is embedded in this end. In the disconnected state, the intermediate electrode 12b is in contact with the intermediate electrode 12b via the contact 13 in FIG.

In the gas-insulated closed switchboard having such a configuration, for example, when the lightning arrester 11 is connected to the roadside for operation, an operating mechanism (not shown) provided in the operating room 1b at the rear part of the rear partition 1a of the box 1 is used. Press the insulating rod 12g for the stroke. Then, both ends of the disconnecting rod 12e are connected to the line-side terminal 12a and the intermediate electrode 12b through the contacts 13, and the lightning arrester 11 shown in FIG. 1 connected to the intermediate electrode 12b has the line-side terminal 12a and the copper rod. The lower terminal of the bushing 6 (not shown) and the rear terminal of the disconnector 3A are connected via 7

In the arrester disconnector 12 having such a configuration, the creepage between the line-side terminal 12a and the intermediate electrode 12b is parallel to the direction of the maximum electric field vector between the electrodes, so that the creeping electric field is Furthermore, since the angle of incidence of the equipotential line on the surface of the insulator 12d is right, the equipotential line is not disturbed due to the difference in the dielectric constant between the insulating gas inside and the insulator 12, and there is continuity. Since the electric field is averaged and the maximum electric field on the surface can be reduced, the withstand voltage can be increased.

Further, since the lightning arrester 11 does not require a penetrating rod or a contact portion that is operated in the axial direction, it can be downsized and it is not necessary to provide a hole under the floor. Further, since the operating rod 12g of the disconnector 12 can be operated from the operation room at the rear of the box 1 at a height that is easy to operate, it is easy to perform.

FIG. 3 shows another embodiment of the disconnector 12 for the arrester of the present invention, in which the line-side terminal 12a and the intermediate electrode 12b are provided on the cylindrical insulator 12h.
A lateral hole 12i penetrating therethrough is provided therebetween. In this case, turning on / off of the internal disconnecting rod 12e can be seen by providing a peep hole in the rear part 1a.

FIG. 4 shows another embodiment of the disconnector for a lightning arrester according to the present invention. Inside the insulator 12j, the line side terminal 12a and the intermediate electrode 12 are provided.
A recess 12h is provided along the entire circumference between b. In this case, the internal creepage distance becomes long, so that the withstand voltage between both electrodes can be further increased.

[Effect of device]

As described above, according to the arrester disconnector of the present invention, one end is connected to the line side terminal of the arrester in the gas-insulated closed switchboard, and the disconnector rod inserted inside is inserted / disconnected between the both ends. In the device, an example of a tubular insulator is embedded with a line-side terminal having a concave gas cross-section in the end face, and a cylindrical intermediate electrode connected to a lightning arrester is embedded in the middle part, and the other end of the insulator is formed. The disconnecting rod inserted from the box was operated from the operation room at the rear of the box to insert and cut between the line-side terminal and the intermediate electrode, so the disconnecting operation is easy and the gas-insulated closed switchboard can reduce the size of the box. It is possible to obtain a lightning arrester disconnector used for.

[Brief description of drawings]

FIG. 1 is a side view of a gas insulated closed switchboard showing an application example of the arrester disconnector of the present invention, and FIG. 2 is a half sectional view showing an embodiment of the arrester disconnector of the present invention, FIG. 3 and FIG. FIG. 4 is a half sectional view showing another embodiment of the lightning arrester disconnector of the present invention, FIG. 5 is a side view showing an application example of a conventional arrester disconnector, and FIG. 6 is a conventional arrester disconnector. FIG. 7 is a detailed cross-sectional view of an essential part, showing the operation of a conventional surge arrester disconnector. 11 ...... Lightning arrester 12 ...... Disconnector 12a ...... Line side terminal 12b ...... Intermediate electrode 12o ...... Insulator 12e ...... Disconnecting rod

Claims (1)

[Scope of utility model registration request] 1. A single pole is connected to a lightning arrester in a gas-insulated closed switchboard, the other pole is connected to a main circuit in the gas-insulated closed switchboard, and both poles are inserted by inserting / removing a disconnecting rod inserted inside.・ In a surge arrester disconnector to be cut, a line side terminal with a concave cross-section with an insulating gas flow port on the end face is embedded in one end of a cylindrical insulator, and connected to the arrester in the middle of the insulator A cylindrical intermediate electrode is embedded, and a rear end airtightly projects into an operation chamber provided on the rear wall of the gas closing switchboard in the cylindrical shape of the insulator, and the front end connects the line-side terminal and the intermediate electrode by the insertion / removal. A disconnector for a lightning arrester, which is equipped with a disconnecting rod for turning on and off.