JP2003059376A - Air circuit breaker with protective frame for electric work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breaker electric work having small size, light weight and good workability, and capable of being used in uninterrupting electric work. SOLUTION: This air breaker for electric work is composed of a switch case 3 formed of an insulating synthetic resin and having an opening part. The breaker is provided with an attaching part 47 being enabled to b e directly installed on a pole, a protective frame 40 mounted on the outer circumference of the breaker so as to surround the main body 2 of the breaker, and a protector 60 provided with a discharging guide part covering the opening part of the main body and discharging the raised pressure of the main body outside in internal short-circuiting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for aerial construction work with a protective frame, and more particularly to a switch main body made of an electrically insulating resin and surrounding the switch main body with the switch. The present invention relates to a switch for aerial work with a protective frame, in which a protective frame is attached.

[0002]

2. Description of the Related Art In a high-voltage power distribution line, when work such as redistribution of distribution lines or lifting of switches and transformers is performed, uninterruptible work is generally performed at present.
This uninterruptible construction work is performed without stopping the power transmission to the customers located on the construction section and its load side even during the construction work, and a bypass circuit is formed by using a cable, a switch for construction, etc. This bypass circuit is designed to continue power transmission.

Equipment such as a work switch used to form the bypass circuit is usually placed in a case such as a protector at a business office of a power company or a business office of a construction company outsourced by the power company. It is always stocked in the state of being housed in the construction site, loaded into a construction vehicle and transported to the work site in the state of being housed during the above construction, taken out from the storage case such as a protector, and temporarily installed on a utility pole at the construction site. It is used.

The construction switch to be used has various performances specified by JIS and the like, and the switch body case is a hermetically sealed box made of ordinary steel plate or stainless steel plate. It is generally a structured container.

[0005]

An insulating (spatial) distance for satisfying a predetermined withstand voltage value is required between the charging part (electrode etc.) and the ground part (main body case etc.) of the switch,
There is a problem that the switch cannot be downsized.

Further, when a short circuit accident occurs inside the switch for some reason while the device is being used, it is necessary to prevent the switch main body from scattering so as not to cause a public disaster.
Therefore, it is necessary to have strength (case plate thickness, etc.) to withstand an increase in internal pressure caused by a short-circuit fault current, and there is also a problem that weight cannot be reduced.

As a construction switch used for uninterruptible construction, a compact and lightweight construction switch is desired, which does not take up space for storage and transportation and is easy to mount or remove on a utility pole. There is.

[0008]

In order to solve the above-mentioned problems, the invention of claim 1 is a switch formed of an insulating synthetic resin having an opening, and a switch surrounding the switch. In the air with a protective frame, which is equipped with a protective frame that is attached to the main body and that has a mounting column that can be directly mounted on a utility pole, and a protective tool that covers the opening of the switch and has a pressure release guide. It is a switch for shape work.

According to a second aspect of the present invention, in the first aspect of the present invention, a perforated plate such as a punching plate having an opening portion or a net body is used for the protection tool, and the protection tool is provided through the opening portion. It is a switch for aerial construction work with a protective frame, which is characterized by releasing the increased internal pressure to the outside.

According to a third aspect of the present invention, in the first aspect of the invention, the protector is provided with a mechanical weak point such as a groove shape, and the internal weak point is opened by the internal pressure to release the internal pressure to the outside. It is a switch for aerial construction work with a protective frame that is characterized by being pressed.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the protective frame is provided with a structure in which the upper surface and the lower surface of the protective frame can be fitted to each other. This is a switch for aerial construction with a protective frame, which has a protective frame structure in which the bottom is fitted.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows a sectional view of the embodiment of claim 1.
3 is a molding such as a vacuum casting method or a pressure gelation method using a material such as an epoxy resin having excellent characteristics such as ultraviolet resistance, mechanical characteristics, tracking resistance, arc resistance, and environmental resistance. It is a main body case that is manufactured so that internal distortion and voids do not easily occur depending on the method, and has a box shape with an open bottom surface. Although the opening is the bottom in the embodiment, the invention is not limited to this, and the opening may be provided on the side and the top.

Reference numerals 3a and 3b denote a load side bushing portion and a power source side bushing portion, which are simultaneously formed at opposing positions when the case 3 is formed, and a female member to which a contact auxiliary piece 7 is attached is attached to the bushing portions 3a and 3b. The central conductors 5, 6 made of copper with the mold contacts 5a, 6a are inserted.

One end 5b of the central conductor 5 located inside the case 3 is connected to a fixed electrode 11 via a conductive member 10. One end 6 of the central conductor 6 located inside the case 3
b is electrically and mechanically axially connected to one end 12b of the blade-shaped movable electrode 12 by axially attaching means such as a pin 30.

The fixed electrode 11 and the movable electrode 12 are male contacts 8a and 9a provided on the cable attachments 8 and 9 via the center conductors 5 and 6 and the contact auxiliary piece 7, respectively.
And can maintain a good contact state.

FIG. 2 shows a bottom view of the switch body 2. The operation of the handle 14 provided outside the case 3 is transmitted to the movable electrode 12 via the operation mechanism 59 and the link mechanism 13, and the movable electrode 12 contacts or separates from the fixed electrode 11 in conjunction with the movement of the handle 14. By doing so, the electric path is turned on or off.

4 and 5 show a left side view and a right side view of the switch body 2. Reference numerals 24 and 25 denote mounting plates made of aluminum, stainless steel, steel, etc., and three-phase (three) insertion holes 24au, 24av, 2 arranged in parallel on the upper portions of the mounting plates 24, 25.
4aw, 25au, 25av, 25aw are U phase bushing parts 3au, 3bu, V phase bushing parts 3av, 3b
The v- and W-phase bushing portions 3aw, 3bw are fitted and fixed to a mounting nut (not shown) inserted in the case 3 by a screw 26.

FIG. 6 shows an embodiment of the protective frame. Protection frame 40
Is assembled in a square frame shape by appropriately using a plate material, a bar material, or a pipe material made of a metal such as aluminum, stainless steel, or steel, or a thermosetting resin such as an epoxy resin, in whole or in part. Then, a column part 47 including two (one pair) guard parts 41 formed by bending a pipe member in a U shape and a side part 44 provided with a hook 45 and a receiving piece 46.
It consists of and. The columnar portion 47 and the guard portion 41 are fixed by screwing the side surface portion 44 and the opening end portion of the guard portion 41 with a screw 43. Between the two (one pair) guard parts 41,
It is fixedly connected by an upper connecting plate 56, a lower connecting plate 28, and a connecting pipe 42 which are suspended at two places at appropriate intervals.

The switch body 2 and the protective frame 40 are fixed by fixing the upper connecting plate 56 and the upper mounting holes 24c, 2 of the mounting plates 24, 25.
5c with the screw 48, the lower connecting plate 28 and the mounting plate 24,
The lower mounting holes 24d and 25d of 25 are respectively screwed with screws 29 to fix the guard portion 41 to the switch body 2.
In this state, the switch main body 2 and the protective frame 40 are integrated by screwing the side surface portion 44 of the pillar portion 47 to the open end portion of the guard portion 41 with a screw 43 to fix the side surface portion 44.

A protective member 60 made of a metal such as aluminum, stainless steel, or steel, a thermosetting resin such as an epoxy resin, or a synthetic rubber such as ethylene-propylene rubber is provided so as to cover the opening of the switch body 2. It is fastened to the lower connecting plate 28 by spanning between the connecting plates 28.

An embodiment of the protector 60 is shown in FIGS. FIG. 12 shows an embodiment in which a punching plate is used. In addition to the above, the protection tool can be fixed to the switch body. FIG. 13 shows an embodiment in which an X-shaped groove is provided as a mechanical weak point. As the structure of the pressure relief guide,
In addition to the above, as shown in FIG. 11 and the like, it is only necessary to regulate the pressure release direction when releasing the pressure increase due to an internal short circuit to the outside.

FIG. 10 is a view showing the state of the mounting columns of the switch 1 for aerial construction with a protective frame having the above construction. The aerial work switch 1 stored in the sales office is loaded on a construction vehicle and transported to the construction site. Of course, when the construction is completed, the switch 1 for aerial construction is removed from the utility pole, transported, and brought back.

At the construction site, the aerial-type construction switch 1 which has been mounted and transported in advance to a predetermined position of the electric pole 50 by a mounting device 54 having a hanging portion 51, a receiving portion 52 and a retaining pin 53.
Is hung by a crane or the like via a rope (not shown) on the hook 55, and the hook 45 and the receiving piece 46 attached to the side surface portion 44 of the protective frame 40 are hooked on the hook portion 51 and the receiving portion 52, respectively. By inserting the stop pin 53, the aerial work switch 1 can be easily fixedly supported on the electric pole.

In the above state, when an internal short-circuit accident occurs in the switch for some reason when the bypass circuit is formed and power is transmitted, and the switch internal pressure rises due to the arc current due to the short-circuit accident, The switch 1 for aerial work is designed to open the internal pressure from the opening bottom of the switch main body to the outside from the initial point of the internal pressure rise through the opening of the protector or the groove opened by the internal pressure. It can be discharged to suppress an increase in internal pressure and prevent breakage of the switch body.

Further, since the switch frame body can be protected from the collision of other equipment by the surrounding protection frame, the mechanical strength of the switch body, that is, the wall thickness of the switch case 3 can be reduced, The weight of the switch body can be reduced.

By using an insulating synthetic resin or synthetic rubber as the material of the protector, the insulating distance between the charging part and the protector can be made smaller than that of the conventional metal case.

FIG. 11 shows another embodiment using a synthetic rubber such as ethylene-propylene rubber. Reference numeral 60 denotes a protector which is attached to the side surface of the opening of the switch body 2 by the elastic force of the rubber body so as to cover and close the opening of the switch body 2.

The structure in which the opening of the switch main body 2 is covered with the protector 60 is different from that of the above-described embodiment, and a substantially groove-shaped portion is provided on the bottom surface of the opening side wall plate of the switch main body 2 to protect the switch. A structure in which the tip end portion is inserted may be used, and dust or the like can be prevented from entering the inside of the switch by covering and closing the opening of the switch main body 2.

In the event of an internal short-circuit accident, the protector 60 is deformed by the internal pressure and the portion inserted into the side surface of the switch body 2 is opened, so that the increased internal pressure can be promptly increased. The pressure can be released to the outside of the main body, and damage to the switch main body can be prevented. Since the protector 60 is fixed to the protective frame 40, it does not scatter. Further, it is also possible to adopt a structure in which the pressure relief guide portion of claim 3 is provided on the bottom surface of the protector.

The groove shape of claim 3 is the same as that of the embodiment of FIG.
It may be in any shape such as a V shape. Further, in order to open the mechanical weak point portion of the protector more quickly, a plate provided with a hole having substantially the same shape as the shape of the mechanical weak point portion of the protector may be attached to the lower side of the protector. .

The embodiment of claim 4 is shown in FIGS. 14 (a) and 14 (b).
Shown in. 14A and 14B are a front view and a right side view of the embodiment, and 61 is a substantially L-shaped cross-sectional shape made of aluminum, stainless steel, and steel fixed to the bottom surface of the guard portion 41. It is a metal fitting provided with a recess notch hole.

The stacked state is shown in FIGS. 15 (a) and 15 (b). During stacking, the recessed notch hole of the metal fitting 61 of the upper stacking switch is fitted with the side surface portion 44 of the lower stacking switch to restrict movement in the front-rear direction, and the side wall surface of the upper stacking switch metal fitting 61 is a guard part of the lower stacking switch. By covering the outside of the upper part of 41, the movement in the left-right direction is regulated, and the structure is such that stacking can be performed without lateral displacement.

[0034]

The present invention has the following effects. By forming the switch body with insulating synthetic resin,
The insulation distance between the charging part and the ground can be made smaller than that of the conventional metal case, and the switch body can be made compact. Further, when the switch main body is formed and manufactured, the parts such as the bushing center conductor and the mounting nut can be formed at the same time with high dimensional accuracy, so that the number of assembling steps can be reduced and the assembling time can be reduced.

When the switch is internally short-circuited, since the switch main body is opened, the internal pressure raised from the switch opening can be promptly released to the outside through the pressure release guide portion of the protector. The pressure rise value is kept low, and even synthetic resin will not explode.

By opening the switch body, the weight can be reduced. Since the opening of the switch body is covered with protective equipment, it is prevented from contacting the charging part inside the switch from the outside. There is no electric shock and it is safe.

Since the switch main body can be protected from collision with other equipment by surrounding it with the protective frame, the mechanical strength of the switch main body, that is, the wall thickness of the switch main body case can be reduced. Further, the weight of the switch can be reduced. Workability is good because the pillar can be installed without removing the protective frame of the switch.

By using an insulating synthetic resin or synthetic rubber as the material of the protective equipment, the insulation distance between the live part and the protective equipment can be made smaller than that of the conventional metal case.
Further miniaturization can be achieved.

According to the invention of claim 2, in addition to the above effect, there is an advantage that the discoloration and contact condition of the movable electrode and the fixed electrode can be visually confirmed from the opening portion, and the maintenance work of the switch can be facilitated.

In addition to the above effects according to the third aspect of the present invention, by covering the switch opening with a protector made of synthetic rubber, it is possible to prevent dust from entering the switch, and to prevent electrode contact during storage or use. Current carrying performance due to dust adhesion to parts, etc.
There is an advantage that performance deterioration such as operation performance can be prevented.

According to the fourth aspect of the invention, when a plurality of units are stored, the storage space for one unit is sufficient, so that the storage space can be easily secured and the storage cost can be reduced. Since it is possible to transport with one construction vehicle even for construction that uses multiple vehicles, it is sufficient to have only one parking space for the construction vehicle and the construction vehicle at the construction site, which can reduce transportation costs. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an aerial work switch with a protective frame according to the present invention.

FIG. 2 is a bottom view of the switch shown in FIG.

3 is a front view of the switch shown in FIG. 1. FIG.

FIG. 4 is a left side view of the switch shown in FIG.

5 is a right side view of the switch shown in FIG.

FIG. 6 is a left side view of the protective frame shown in FIG.

FIG. 7 is a front view of the airborne work switch with a protective frame shown in FIG. 1.

8 is a rear view of the switch for aerial construction with a protective frame shown in FIG.

9 is a left side view of the switch for aerial construction with a protective frame shown in FIG. 1. FIG.

FIG. 10 is a view showing a mounting state of the switch for aerial work with a protective frame shown in FIG.

FIG. 11 is a cross-sectional view showing another embodiment of the switch for aerial construction with a protective frame.

FIG. 12 is an external view of a protector according to an embodiment of claim 2.

FIG. 13 is an external view of a protector according to an embodiment of claim 3.

14 (a) is a front view and FIG. 14 (b) is a right side view of a switch for aerial work with a protective frame, which is an embodiment of claim 4. FIG.

15 (a) is a front view of the stacked state, and FIG. 15 (b) is a right side view of the stacked state.

[Explanation of symbols]

1 Airborne switch for construction 2 Switch body 3 cases 40 protection frame 41 Guard 47 Pillar part 50 utility poles 54 Mounting device 58 Phase separation wall plate 60 protective equipment 61 metal fittings

Claims (4)

[Claims] 1. A switch comprising an insulating synthetic resin having an opening, and a pole part attached to the switch main body so as to surround the switch and capable of being directly mounted on a utility pole. A switch for aerial work with a protective frame, which includes a protective frame and a protective tool that covers the opening of the switch and has a pressure release guide. 2. The protective tool is a perforated plate such as a punching plate having an opening or a net, and the internal pressure increased through the opening of the protective tool is released. An aerial work switch with a protective frame according to claim 1. 3. The protective member is provided with a mechanical weak point portion such as a groove shape, and the internal pressure raised by the opening of the mechanical weak point portion by the internal pressure is released. Switch for aerial construction with protective frame 4. A protective frame structure is provided in which the upper and lower surfaces of the protective frame can be fitted to the protective frame, and when the switches are stacked, the upper and lower surfaces of the opposing protective frames are fitted to each other. A switch for aerial construction with a protective frame according to claim 1, 2 or 3.