Protective device for switch

Abstract

To provide a protective device for a switch capable of protecting a worker from coming into contact with a high-voltage line when performing work near a pole switch (PAS) in a site of a consumer.SOLUTION: A protective device (protective device 100) for a switch of a utility pole (first pole 30) includes an attachment part 110 attached to an arm metal (lower arm metal 34) supporting a lead-in wire 26 pulled down from a switch 40, a pole 170 connected to the attachment part, and a net 180 hung from the pole. The attachment portion includes a U-shaped fitting portion (first fitting portion 120) including a horizontal portion facing an upper surface of the cross arm and a pair of side surface portions 124 and 126 facing side surfaces of the cross arm, a jaw portion (first jaw portion 152) provided at a lower end of an inner surface of the side surface portion on the rod side of the pair of side surface portions and protruding toward the cross arm, and a magnet 160 attached to the horizontal portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a switch protection device mounted on a utility pole. [Background technology]

[0002] For relatively large consumers such as factories, high-voltage lines are pulled from outside the consumer's premises (hereinafter referred to as "outside the consumer") into the consumer's premises (hereinafter referred to as "inside the consumer"), and the voltage is reduced in the consumer's machine room before electricity is used. Previously, high-voltage lines branching off from utility poles outside the consumer's premises were connected to service lines via pole-mounted switches (also called air switches: AS) and pulled into the consumer's premises. For example, Patent Document 1 discloses a pole-mounted switch that is suspended from an arm attached to a utility pole.

[0003] The service line pulled in from a utility pole outside the customer's premises is connected to a pole air switch (PAS, also known as an air load switch) installed on the first utility pole (pole No. 1) within the customer's premises. In many cases, the power goes underground from the pole air switch (PAS) via a drop line, and then is distributed to the customer's premises via an underground line. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-28012 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, previously, the pole switch (AS) outside the customer's premises was connected to the pole switch (PAS) inside the customer's premises by a service line. Therefore, by opening (disconnecting) the pole switch (AS), work could be carried out without charging either the primary or secondary sides of the pole switch (PAS). In contrast, in recent years, the pole switch (AS) has been omitted, and a service line branched off from the high-voltage line is now directly connected to the pole switch (PAS). In such cases, even if the pole switch (PAS) is opened, its primary side remains charged. Therefore, sufficient care must be taken to ensure that workers working near the pole switch (PAS) do not come into contact with the high-voltage line.

[0006] In view of these problems, the present invention aims to provide a protective device for a switch that can protect workers from coming into contact with high-voltage lines when working near a pole-mounted switchgear (PAS) on a customer's premises. [Means for solving the problem]

[0007] In order to solve the above problems, a representative configuration of the switch protection device of the present invention is a switch protection device for a utility pole, comprising an attachment part attached to an arm supporting a drop wire pulled down from a switch, a pole connected to the attachment part, and a net hanging down from the pole, wherein the attachment part has a U-shaped fitting part consisting of a horizontal part facing the top surface of the arm and a pair of side parts facing the side surfaces of the arm, a jaw part provided at the lower end of the inner surface of the side part on the pole side of the pair of side parts and protruding towards the arm, and a magnet attached to the horizontal part.

[0008] The attachment portion may include a second fitting portion on the opposite side of the fitting portion, the second fitting portion having a pair of side surfaces spaced apart from one another.

[0009] Of the pair of side surfaces, the side surface opposite the rod may be provided with a screw for clamping the arm.

[0010] The rod may be rotatably connected to the mounting portion.

[0011] The lower end of the net may be provided with a rope for tying the net to a utility pole. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a switch protection device that can protect a worker from coming into contact with high-voltage lines when working near a pole-mounted switch. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating a work site where work related to a pole-mounted switch is performed. [Figure 2] 1 is a diagram illustrating a switch protection device according to a first embodiment. FIG. [Figure 3] 10A and 10B are diagrams illustrating a mounting portion. [Figure 4] 10A and 10B are diagrams illustrating a method of attaching a protection device to a lower arm. [Figure 5] 10A and 10B are diagrams illustrating a method of attaching a protection device to a lower arm. [Figure 6] 10A and 10B are diagrams illustrating a method for removing the protective device from the lower arm. [Figure 7] 10A and 10B are diagrams illustrating a method for removing the protective device from the lower arm. [Figure 8] FIG. 6 is a diagram illustrating a switch protection device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0015] Fig. 1 is a diagram illustrating a work site 10 where work related to a pole-mounted switch 40 is performed. As shown in Fig. 1, at the work site, an electric power company utility pole 20 is installed outside the customer's premises (outside the customer's premises). Furthermore, a customer utility pole (hereinafter referred to as No. 1 pole 30 to distinguish it from the electric power company utility pole 20) is installed within the customer's premises (inside the customer's premises).

[0016] A high-voltage line 24 is strung across cross arm 22 of utility pole 20 of the electric power company. A service line 26 branching off from high-voltage line 24 is connected to a pole-mounted switchgear (PAS) (hereinafter referred to as switch 40) installed on the upper cross arm 32 of pole No. 1 30. A service line 50 is also pulled down from switch 40. Service line 50 is supported on the lower cross arm 34 of pole No. 1 30. Electric power transmitted by high-voltage line 24 is supplied to the customer's equipment via this service line 50.

[0017] In the above-described configuration, the primary side of the switch 40 is the power company's equipment, and the switch 40 and its secondary side are the customer's equipment. In other words, in terms of electrical equipment, the primary side of the switch 40 is outside the customer's facility, and the secondary side is inside the customer's facility. In this configuration, since there is no pole-mounted switch (AS) on the utility pole 20, the primary side of the switch 40 cannot be left uncharged. For this reason, when working near the pole-mounted switch 40, sufficient safety precautions must be taken to ensure that workers do not come into contact with the high-voltage line 24.

[0018] For example, if the bucket 62 of the aerial work platform 60 comes into contact with the drop wire 26, or if various materials and equipment suspended by the crane or the upper arms 32, 34 get caught on the drop wire 26, there is a risk of damaging the drop wire 26 and causing an electric shock accident or a ground fault accident. Therefore, in this embodiment, a protective device for a utility pole switch that can be attached to the No. 1 pole 30 of a customer will be described.

[0019] (First embodiment) 2 is a diagram illustrating a switch protection device according to a first embodiment (hereinafter referred to as a protection device 100). As shown in FIG. 2, the protection device 100 of the first embodiment includes a mounting portion 110, a pole 170, and a net 180.

[0020] The mounting portion 110 is a member attached to the arm that supports the drop wire 50 pulled down from the switch 40, i.e., the lower arm 34. A pole 170 is connected to the mounting portion 110, and a net 180 hangs down from the pole 170.

[0021] 3 is a diagram illustrating the attachment portion 110. As shown in FIG. 3, the attachment portion 110 includes a narrow fitting portion (for convenience, referred to as a first fitting portion 120), a wide second fitting portion 130, a connecting portion 140, jaw portions (a first jaw portion 152 and a second jaw portion 154), and a magnet 160.

[0022] The first fitting portion 120 is U-shaped and includes a horizontal portion 122 and a pair of side portions 124, 126. The horizontal portion 122 extends along the upper surface 34a of the lower arm 34 and is disposed in a position facing the upper surface 34a of the lower arm 34. The pair of side portions 124, 126 extend from the edge of the horizontal portion 122 so as to follow the side plate 36 of the lower arm 34.

[0023] The second fitting portion 130 is U-shaped and includes a horizontal portion 122 shared with the first fitting portion 120, and a pair of side portions 134, 136. The second fitting portion 130 is provided on the opposite side of the first fitting portion 120 with respect to the horizontal portion 122 and facing in the opposite direction.

[0024] A feature of the protective device 100 of the first embodiment is that the distance D2 between the pair of side surfaces 134, 136 of the second fitting portion 130 is different from the distance D1 between the pair of side surfaces 124, 126 of the first fitting portion 120. As an example, in the first embodiment, the distance D2 between the pair of side surfaces 134, 136 of the second fitting portion 130 is wider than the distance D1 between the pair of side surfaces 124, 126 of the first fitting portion 120.

[0025] According to the above configuration, for the lower arm 34 having width W1 as illustrated in Fig. 3, the mounting portion 110 can be attached to the lower arm 34 by using the first fitting portion 120. For a lower arm wider than width W1, the mounting portion 110 can be attached to the lower arm 34 by turning the mounting portion 110 upside down and using the second fitting portion 130. Therefore, one mounting portion 110 can be used for two types of arms with different widths.

[0026] The connecting part 140 is provided on the side surface of the mounting part 110, and rotatably fixes the tip part 172 of the rod 170 with a mounting screw 174. The direction of rotation of the rod 170 is the plane direction of the horizontal part 122, and the rod 170 can rotate horizontally when the mounting part 110 is fixed to the lower bracket 34. Therefore, the rod 170 can be fixed at any angle (within 180°) relative to the orientation of the lower bracket 34.

[0027] 3, the first fitting portion 120 and the second fitting portion 130 are provided with a first jaw portion 152 and a second jaw portion 154, respectively. The first jaw portion 152 is provided near the lower end (near the tip) of the inner surface 126b of the side surface portion 126 on the rod 170 side of the pair of side surface portions 124, 126 of the first fitting portion 120, and protrudes toward the lower bracket 34. The second jaw portion 154 is provided near the lower end (near the tip) of the inner surface 136b of the side surface portion 136 on the rod 170 side of the pair of side surface portions 134, 136 of the second fitting portion 130, and protrudes toward the lower bracket 34.

[0028] The magnets 160 are attached to the upper and lower surfaces of the horizontal portion 122. This allows the mounting portion 110 to be fixed to the lower arm 34 made of iron by magnetic force.

[0029] (Method of installing the protection device 100) 4 and 5 are diagrams illustrating a method of attaching the protection device 100 to the lower arm 34. FIG. In this embodiment, the protective device 100 is attached to the lower bracket 34 using the second fitting portion 130, which is wider, but the attachment method is similar even when the first fitting portion 120, which is narrower, is used.

[0030] When attaching the protective device 100 to the lower arm 34, first, as shown in Figure 4(a), the second jaw 154 of the second fitting part 130 is hooked onto the barb 36a (flange) of the side plate 36. In this way, the jaw (the second jaw 154 in this embodiment) functions as a guide during attachment.

[0031] Next, as shown by arrow A in Figure 4(b), the rod 170 is rotated upward using the second jaw 154 as a fulcrum, and the second fitting part 130 is placed over the lower arm 34. Then, when the mounting part 110 is moved downward as shown by arrow B in Figure 5, the magnet 160 attached to the horizontal part 122 is attracted to the lower arm 34, and the protective device 100 is fixed in place.

[0032] When the protective device 100 is fixed by the lower arm 34, the second jaw 154 is in a state of being stretched against the lower arm 34 as shown by arrow C. As a result, even if the rod 170 tries to tilt downward, the second jaw 154 abuts against the lower arm 34, preventing the tilt. In this way, the jaw (the second jaw 154 in this embodiment) has the function of preventing the rod 170 from tilting and, in turn, the protective device 100 from falling off.

[0033] Here, the net 180 of the protection device 100 of this embodiment has a rope 182 attached to its lower end (see FIG. 2). After the protection device 100 is attached to the lower arm 34 as described above, the rope 182 is tied to the No. 1 pole 30 (electric pole), thereby binding the lower part of the net 180 to the No. 1 pole 30. This makes it possible to prevent the net 180 from being blown away by wind or the like, thereby enhancing the above-mentioned effects.

[0034] According to the protective device 100 described above, by attaching it to the lower arm 34 and hanging a net 180 from the pole 170, the work site near the pole-mounted switchgear 40 can be divided into areas by the net 180. Therefore, as shown in FIG. 1, it is possible to divide the area into an area where work is permitted inside the customer premises (secondary side) and an area where entry is prohibited outside the customer premises (primary side). This allows workers to clearly identify dangerous areas close to high-voltage lines. Therefore, the protective device 100 of this embodiment can reliably prevent workers from coming into contact with the high-voltage lines 24.

[0035] (Method of removing the protective device 100) 6 and 7 are diagrams illustrating how to remove the protection device 100 from the lower arm 34. When removing the protection device 100 attached to the lower arm 34 as shown in Fig. 5, first, lift the pole 170 upward as shown by arrow D in Fig. 6(a). This separates the magnet 160 of the horizontal part 122 from the lower arm 34.

[0036] Next, as shown by arrow E in Figure 6(b), the rod 170 is rotated while twisting. This causes the magnet 160 to move further away from the lower arm 34, thereby weakening the magnetic force. Then, while rotating the rod 170, the second jaw 154 is brought into contact with the barb 36a of the side plate 36.

[0037] 7, the rod 170 is rotated downward using the second jaw portion 154 as a fulcrum, and the second fitting portion 130 is removed from the lower arm 34. This allows the protective device 100 to be removed from the lower arm 34. In this way, the second jaw portion 154, which serves as a fulcrum, is in contact with the lower arm 34 when removing the protective device 100, so it is possible to prevent the protective device 100 from accidentally falling off.

[0038] (Second embodiment) Fig. 8 is a diagram illustrating a switch protection device according to a second embodiment (hereinafter referred to as a protection device 200). In the protection device 200 shown in Fig. 8, components common to the protection device 100 of the first embodiment shown in Fig. 2 are denoted by the same reference numerals, and description thereof will be omitted.

[0039] 2 has two fitting portions (first fitting portion 120 and second fitting portion 130), whereas in the protective device 200 of the second embodiment shown in FIG. 8, the mounting portion 210 has only one fitting portion 220. That is, the mounting portion 210 of the protective device 200 is configured to include the fitting portion 220, the connecting portion 140, the jaw portion 252, and the magnet 160.

[0040] The fitting portion 220 is U-shaped and includes a horizontal portion 222 and a pair of side portions 224, 226. Of the pair of side portions 224, 226 of the fitting portion 220, a jaw portion 252 is provided at the lower end of an inner surface 226b of the side portion 226 on the rod 170 side.

[0041] A feature of the protective device 200 of the second embodiment is that, of the pair of side surface portions 224, 226, the side surface portion 224 on the opposite side of the rod is provided with a clamping screw 230 that is a screw for clamping the second cross arm 22.

[0042] According to the above configuration, if the width W2 of the lower arm 34 is within the range of the clampable distance D3, the protective device 200 can be attached to the lower arm 34 by adjusting the tightening of the clamping screw 230. Therefore, one fitting portion 220 can be used for multiple types of arms with different widths, and it is possible to obtain the same effects as the protective device 100 of the first embodiment.

[0043] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0044] The present invention can be used in a switch protection device attached to a utility pole. [Explanation of symbols]

[0045] D1...spacing, W1...width, D2...spacing, 10...work site, 20...utility pole, 22...cross arm, 24...high voltage line, 26...service line, 30...pole No. 1, 32...upper cross arm, 34...lower cross arm, 34a...top surface, 36...side plate, 36a...return, 40...switch, 50...service line, 60...aerial work vehicle, 62...bucket, 100...protective device, 110...mounting portion, 120...first fitting portion, 122...horizontal portion, 124...side portion, 126...side portion, 126a...outer surface , 126b...inner surface, 130...second fitting portion, 134...side portion, 136...side portion, 136b...inner surface, 140...connecting portion, 142...wall, 144...wall, 152...first jaw portion, 154...second jaw portion, 160...magnet, 170...rod, 172...tip portion, 174...mounting screw, 180...net, 182...rope, 200...protective device, 210...mounting portion, 220...fitting portion, 224...side portion, 226...side portion, 230...clamping screw, 252...jaw portion

Claims

1. A protective device for a switch on a utility pole, a mounting portion attached to an arm supporting the drop line pulled down from the switch; a rod connected to the mounting portion; A net suspended from the pole; Equipped with The mounting portion is a U-shaped fitting portion consisting of a horizontal portion facing an upper surface of the arm and a pair of side portions facing side surfaces of the arm; a jaw portion provided at a lower end of an inner surface of the side surface portion of the pair of side surfaces that is on the rod side and that protrudes toward the arm; a magnet attached to the horizontal portion; A switchgear protection device comprising:

2. 2. The switch protection device according to claim 1, wherein the mounting portion has a second fitting portion on the opposite side of the fitting portion, the second fitting portion having a pair of side portions spaced apart from each other by a different distance.

3. 2. The switch protection device according to claim 1, wherein a screw for clamping the arm is provided on the side surface of the pair of side surfaces opposite to the rod.

4. 4. The switch protection device according to claim 1, wherein the rod is rotatably connected to the mounting portion.

5. 4. The switch protection device according to claim 1, further comprising a rope attached to a lower end of the net for tying the net to the utility pole.

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