JPS5843168Y2 - box cutout switch - Google Patents

Description

[Detailed description of the invention] This invention is particularly applicable to 20 to 30 KV class power distribution lines.
This invention relates to a box-shaped cutter I switch that protects transformers and can switch on and off load current.

As the capacity of power distribution lines increases, the voltage increases, and the electrical equipment that protects them inevitably becomes larger.However, there are issues with safety measures, anti-pollution measures, aesthetics on poles, etc., and the development of this type of equipment is required. It had been.

The present invention utilizes the configuration of a box-shaped cut-out switch that has been proven in the past, uses a power fuse with a large breaking capacity as a breaking device, and separately incorporates a load switching device mechanism. The purpose of this invention is to provide a box-shaped cut-out switch that can achieve the objectives of the present invention.

The configuration of the present invention will be specifically explained below with reference to the drawings.

The back side of the main insulator which has the hollow part 2 inside is integrally protruded with a supporting part 3 in the central part thereof, and is closed corresponding to the open surface of the main insulator 1. A lid insulator 4 is pivoted 5 at the rear end of a main insulator 1 so as to be freely openable and closable.

External lead wires 6 and 7 are led out from the front and rear surfaces of the main insulator 1, respectively, and a molded cone 8 is connected to the main insulator 1.
Protect and fix in steps 9 and 9.

The upper lead wire 6 led out from the front side is attached with a bolt 11 on the short piece 10a side of the L-shaped upper electrode fixing plate 10 inside the insulator, and the lower lead wire 7 led out from the rear side is attached with a dowel.
Bolt the lower electrode fixing plate 12 inside the insulator.
3 to electrically connect them.

The direction in which the lead wires are led out is almost perpendicular to the insulator surface at the top, but the lead wires at the bottom are slightly oblique as the main body insulator side is cut out to escape the rear end when the lid insulator is opened. It's in the direction.

A load switching device section M is provided at the front of the cavity of the main insulator.

The specific structure of this load switchgear section M will be explained based on FIG. A fixed electrode 16 is installed inside, and the long piece 10b side of the upper electrode fixing plate 10 is fixed with a bolt 17 at the center position together with a stopper fixing plate 26 described later.
is adhesively fixed to the inner surface recess 18 of the main insulator 1.

A guide tube 19 made of an insulating material is slidably inserted into the outer periphery of the arc extinguishing cylinder 14, and the inner end locking part 20 of the guide tube 19 and the outer end locking part 21 of the arc extinguishing cylinder 14 are connected. between guide tube 1
A coil spring 22 that is compressed by the sliding motion of the arc extinguishing tube 14 is wound around the arc extinguishing tube 14 .

Further, the outer end of the guide tube 19 is provided with a cap-shaped support member 23.
The guide lid 23 is hermetically sealed, and a hole is provided in the center of the guide lid 23 through which a movable electrode rod 24 (described later) is inserted.

The movable electrode rod 24 slides in the center hole 15 of the arc extinguishing cylinder 14 and corresponds to the upper fixed electrode 16 so as to be able to freely approach and separate from it. The opening/closing hook 25, which is integrally provided with a truncated conical enlarged portion 25a at its tip, is fixed to the protruding portion by screws or the like so as to protrude from the end face 23a of the support member 23 toward the open side.

Further, near the end of the long piece 10b of the upper electrode fixing plate 10, two supporting metal fittings 2 are provided in a double-barrel shape relative to the stopper fixing plate 26.
7. Fix 27 by welding, etc.

Two horizontally long elliptical holes 28 and 28' are provided in positions slightly above the support fittings 27 and 27 so as to correspond to each other, and stopper pins 29 and 29' are inserted into the elliptical holes. A stopper pin 29.29' is supported and fixed by a spring 30.30' on the outer side of the support fitting 27.27.

Further, a constricted portion 31 having a cross-sectional shape in a direction perpendicular to the supporting metal fitting is provided.
A holding fitting 31 made of an elastic material having a diameter of 1.a is fixed to the stopper fixing plate by spot welding, screws, etc. so that its constricted portions are located inside the stopper pins.

32 is a lower fixed electrode attached to the substantially L-shaped lower electrode fixing plate 12 on the rear surface.

Next, explaining the lid body side, a stopper pin 28, 28' provided on the body insulator side is provided at the front end of the inner surface of the lid body insulator 4.
A support metal fitting 34 for the power fuse F is fixed to the position corresponding to the movable electrode rod, and contact plates 37 and 37 are fixed to the inner surface of the lid insulator 4 via the support plate 33, respectively.

To explain this part in more detail, the support fitting 34 of the power fuse F has an L-shaped bottom so that it can be bolted to the support plate 33, and an integrally vertical circular portion 34 b
is the cap-shaped electrode 35.3 on both ends of the power fuse in the center.
A circular insertion hole 34a through which the 5' can be inserted is provided, and the front side of the lid body at the inner circumference of the insertion hole 34a is expanded slightly outward for guiding the fuse, and at approximately the center. , a plurality of contact pieces 36 to 36 are fixed in contact with the cap-shaped electrode 35 of the power fuse F.

Further, the distal end of the circular portion 34b of the support fitting is integrally provided with a locking protrusion 34C having a constricted portion 34d that can be inserted and fixed into the stopper pin 29, 29' portion of the main body side. There is.

On the front end side of the support plate 33, two contact plates 37, 37 extending in parallel toward the front surface of the lid body are pivoted at their base ends to a fixed plate, and springs 48, 48 are interposed on both sides to provide contact Board 37
．． The contact plate is designed to have enough room for the tips of the contacts 37 to spread out from each other, and to position the contact plate at a position corresponding to the conductive rod cap 25 of the load switching device M fixed to the main body insulator.

The rear end of the power fuse F is screwed to a fuse fixing fitting 40 that is fixed by screws or caulking to an L-shaped vertical portion 39 that is integrated with a bearing portion 38 that is fixed to the lid insulator. .

In the figure, reference numeral 41 denotes a contact blade fixed to the fuse fixing fitting 40, which is capable of moving toward and away from the lower fixed electrode 32 on the insulator side of the main body.

Reference numeral 42 denotes an arc rod fixed to the tip of the movable electrode rod 24 via an arc-proof metal part 43 with a screw or the like.

Reference numeral 44 denotes a cap-shaped metal fitting that is fixed to the support portion 3 on the back side of the main body insulator by cementing or the like, and is fixed to the arm mounting fitting 45 with bolts 46.

Reference numeral 47.47 denotes insulating ribs integrally provided on the outer circumferential surface of the main insulator in a substantially symmetrical manner with the support portion 3 as the center.

Also, on the front side of the power fuse F, there is a cap-shaped electrode 3.
A rod-shaped support receiving part 49 is provided axially protruding from the support receiving part 49, and a pair of protrusions 50.
50 is provided integrally, and has a structure that can be engaged with a dedicated operating rod when attaching or removing the fuse.

51 is a waterproof plate made of rubber or the like fixed to the rear notch of the main insulator 1, and 52 is a cushioning material against contact with the lid insulator made of a rubber material fixed to the inner peripheral surface of the main insulator with adhesive or the like. It is.

53 is a gas vent hole provided around the arc extinguishing cylinder 14, and 54 is a depressurization hole communicating with the center hole 15 provided in a part of the end surface of the guide tube.

Next, to explain the function and effect of the cut-out switch of the present invention, when opening the cut-out switch from the closed state shown in FIG.
7, 37, the enlarged part 25a of the opening/closing hook 25 is pulled, the support member 23 and the guide tube 19 are connected to the coil spring 2.
2 is stretched while being compressed.

The lid insulator 4 moves in an arc with the shaft 5 as a fulcrum, whereas the opening/closing hook 25 moves in a straight line.As shown in FIG. Leave.

Since the movable electrode rod 24 is naturally connected to the opening/closing hook 25, the conductive rod cap 25 is connected to the contact plate 37.37.
Follows the movement of the lid insulator 4 until the bond is released,
It is separated from the upper fixed electrode 10.

At this time, an arc is generated between the arc-resistant metal part 43 and the upper fixed electrode 10, but it is elongated and extinguished by the gap effect formed by the arc-extinguishing rod 42 and the arc-extinguishing cylinder 14.

Further, the residual gas accompanying the arc extinguishing is released from the gas vent hole 53 around the arc extinguishing tube.

In this case, the fuse support fitting 34 is located inside the movable electrode rod 24 with respect to the fulcrum 5, and is designed to be separated before the movable electrode rod 24 partially separates from the fixed electrode 10.

The completely opened state is as shown in FIG. 1, but when the state shown in FIG. returns to the original state.

The movable electrode rod and the fixed electrode are designed to be completely separated from each other when the conductive rod cap and the contact plate are disengaged from each other.

When charging, first place the ampulla 2 between the contact plates 37 and 37.
5a is in contact, and the springs 48 and 48' provide a margin, so when the tip of the contact plate expands, goes beyond the ampullae, and fits into the neck of the opening/closing hook 25, it is in the normal closing state. .

In addition, the fuse support fitting 34 has a tip locking protrusion 34.
C connects the stopper pin 29, 29' to the spring 30,
It fits by pushing it out against 30'.

Therefore, the lid insulator 4 and the power fuse F are held in the closed state by the engagement between the stopper pin 29, 29' and the locking protrusion 34C of the support fitting 34, and the contact plate 37°37 and the enlarged portion 25a. Since it is maintained by both, there is no risk of spontaneous release due to vibrations, etc.

In addition, the energization path in the closed state is upper lead wire 6 → upper electrode fixing plate 10 → upper fixed electrode 16 → movable electrode rod 24
→ Opening/closing hook 25 → Contact plate 37, 37 → Support plate 33
→ Support metal fitting 34 → Contact piece 36 → Fuse cap-shaped electrode 35 → Fuse element (not shown) → Fuse cap-shaped electrode 35' → Fuse fixing metal fitting 12 → Lower lead wire 7 is the main path, but the upper Electrode fixing plate 10
The path from there to the fuse support fitting 34 via the stopper fixing plate 26 and the stopper pins 29 and 29' also serves as an auxiliary current-carrying path.

Furthermore, one of the features of this invention is that the power fuse can be replaced independently in the power out switch.
In this case, you can simply remove the screw at the rear end from the front side of the lid using a special operating rod and pull it out.

As explained above, the present invention has a load switchgear section separate from the breaker section consisting of a power fuse with a large breaker capacity, so the space in the main body insulator can be used effectively. Since the depth of the main body insulator can be made shallow, the entire device can be made smaller.

In addition, the retention of the lid insulator considering the weight of the power fuse is
Since the locking mechanism is an integrated locking mechanism that combines fuse fixation and electrical contact, the structure is simple, and the spring-based clamping mechanism allows secure locking while also making it easy to separate. It has this feature.

Furthermore, the arc extinguishing device has a new structure in which a guide tube on the outer periphery of the arc extinguishing cylinder, together with a movable electrode, follows the opening of the lid insulator.
It has the advantage of being easy to operate, has a low failure rate, and is extremely easy to operate.

In addition, in load switchgear, especially when closing, contact is made from the tip of the contact plate, so even if there is some damage due to the arc that occurs, the contact part in the closing state will not be affected, and it can be used for many years. It is excellent for practical use because it absorbs water.

In addition, since a power fuse is used, it is safe even when a large current is cut off, with no sound and arc gas is not released to the outside.Furthermore, since the entire structure is housed inside the insulator, there are no exposed live parts, making maintenance and inspection possible. The top is also safe.

In this manner, when the application is opened, the generated arc is reliably extinguished within the load switchgear M, which is sealed by the arc extinguishing tube 14, the guide tube 19, and the support member 23.
There is no risk that the main body insulator will be pulled out, and although the capacity is large, the operator can safely open and close the cutout switch using the same operation as a normal cutout switch.

Of course, there are excellent current-limiting type power fuses that can cut off so-called small currents, so they can also protect against normal overload currents.

Although detailed explanations are omitted, external flash prevention inside the main body insulator, arcing horn of the electrode section, arc-resistant metal equipment, etc. can be designed as appropriate depending on the use of the device.

As described in detail above, the present invention is particularly excellent as a protection device for large-capacity distribution lines, and can be widely used in industry.

[Brief Description of the Drawings] Fig. 1 is a partially cutaway perspective view showing the cutout switch of the present invention in the open state, Fig. 2 is a main sectional view showing the cutout switch in the closed state;
Figure 3 is a main sectional view showing the state in the middle of opening, Figure 4 is
Figure 5 is a sectional view of the main part showing the rear part with the fuse fixed.
6th cross-sectional view of main parts showing the combined state of the holding fitting and the supporting fitting
The figure is a side view showing the appearance in a closed circuit state.

Claims (1)

[Scope of utility model registration request] An upper fixed electrode 16 and an arc-extinguishing cylinder 14 are fixedly installed inside one end of the hollow part of the main insulator, which has an open front face and a supporting part protruding from the back side, and a guide provided on the outer periphery of the arc-extinguishing cylinder 14. A movable electrode rod 24 and an opening/closing hook 25 are fixed to the support member 23 of the tube 19, and a movable electrode rod 24 and a hook 25 for opening and closing are attached to the fixed electrode, and a coil bower 22 is wound between the arc extinguishing tube 14 and the guide tube 19. A load switching device and a lid locking means are provided, and a lower fixed electrode 32 is fixedly installed inside the lower end, and on the inner surface of the lid insulator, which corresponds to the lid insulator so as to be rotatable in opening and closing with respect to the main insulator. a pair of contact plates 37, 37 corresponding to the load switching device; a support fitting 34 also serving as fuse fixing corresponding to the locking means;
A fuse fixing fitting 40 having a protruding contact blade 41 corresponding to the lower fixed electrode 32 is installed inside, and a power fuse is removably attached between the support fitting 34 and the fuse fixing fitting 40. A box-shaped cutout switch that is characterized by: