Insulating plug with charging function and cable head

Abstract

To provide an insulating plug with a charging function capable of charging with the insulating plug attached, and a cable head.SOLUTION: An insulating plug 3 with a charging function, which is provided in a cable head 1 connected to a main circuit of a power transmission and transformation facility and can seal a conductive connecting portion 2 to which a predetermined power receiving cable 4 is connected without a gap, includes a non-conductive insulating plug body 3p detachably attached to the connecting portion, and a plurality of attachment members 6 and 7 having different functions from each other and detachably attached to the insulating plug body. The plurality of attachment members include a non-conductive insulating attachment member 6 and a conductive electrification attachment member 7, and in a state where the insulating plug main body to which the insulating attachment member is attached is attached to the connection portion, the insulating attachment member is detached and the electrification attachment member is attached to the insulating plug main body, so that electrification can be performed via the electrification attachment member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an insulating plug with a voltage application function and a cable head. [Background technology]

[0002] Known switchgears equipped with cable heads connected to main circuits for receiving and distributing electricity are used as extra-high voltage power receiving and transforming equipment installed in buildings and large facilities. The cable heads have conductive connection parts to which, for example, power receiving cables from electric power companies can be connected. Before connecting the power receiving cables, the connection parts are tightly sealed with insulating plugs. This prevents malfunctions (such as damage or breakage) caused by external loads on the connection parts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-15853 [Patent Document 2] Japanese Patent Application Publication No. 5-191916 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-348574 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in switchgear, a withstand voltage test is performed before connecting the power receiving cable to the cable head (connection part). Assuming a low-voltage phase detection test as an example of the withstand voltage test, in the low-voltage phase detection test, a test AC voltage is applied (i.e., voltage is applied) to the connection part to check the phase sequence of the voltage phase.

[0005] Here, the insulating plug is non-conductive. Therefore, a withstand voltage test (i.e., a low-voltage phase detection test) cannot be performed when the connection is tightly sealed with the insulating plug. The low-voltage phase detection test is performed at the part where the connection tip of the power receiving cable and the connection are electrically connected. In this case, the low-voltage phase detection test can be performed by removing the insulating plug from the connection.

[0006] However, when the insulating plug is removed, the connection is exposed to the outside. This increases the risk of the connection being damaged or destroyed by, for example, an external load. Therefore, there is a need for a method that allows voltage application (i.e., voltage application) while the insulating plug is still attached, so that a withstand voltage (low-voltage phase detection) test can be performed.

[0007] An object of the present invention is to provide an insulating plug and a cable head with a voltage application function that allow voltage application while the insulating plug is attached. [Means for solving the problem]

[0008] According to an embodiment, an insulating plug with a voltage charging function is provided on a cable head connected to the main circuit of a power receiving and transforming equipment, and is capable of sealing without any gaps the conductive connection part to which a specified power receiving cable is connected.The insulating plug has a non-conductive insulating plug main body that can be removably attached to the connection part, and a plurality of mounting members that have different functions and are removably attached to the insulating plug main body.The plurality of mounting members include non-conductive insulating mounting members and conductive voltage charging mounting members.When the insulating plug main body with the insulating mounting members attached is attached to the connection part, the insulating mounting members can be removed and the voltage charging mounting members can be attached to the insulating plug main body, making it possible to charge voltage via the voltage charging mounting members. [Brief explanation of the drawings]

[0009] [Figure 1]1A and 1B are diagrams showing the configuration of a cable head according to one embodiment, in which (a) is an enlarged cross-sectional view of a connection part sealed by an insulating plug with a voltage-charging function, and (b) is a side view showing an enlarged portion of the connection tip of a power company's receiving cable connected to the connection part. [Figure 2] 1A and 1B are diagrams showing the configuration of an insulating plug with a voltage-charging function according to one embodiment, in which (a) is a cross-sectional view of the insulating plug body with an insulating mounting member attached, (b) is a side view of the voltage-charging mounting member attached to the insulating plug body, and (c) is a cross-sectional view of the insulating plug body with the voltage-charging mounting member attached instead of the insulating mounting member. [Figure 3] FIG. 10 is a cross-sectional view showing the configuration of an insulating plug with a voltage-applying function according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] "One embodiment" Fig. 1(a) is a diagram of an arrangement in which the connection portion 2 of a cable head 1 is sealed with an insulating plug 3 with a voltage-feeding function, and Fig. 1(b) is a diagram of the connection end 4t of a power company's receiving cable 4 that is connected to the connection portion 2 of the cable head 1. Figs. 1(a) and 1(b) show an example of the contour shape of the connection portion 2 of the cable head 1 into which the connection end 4t of the receiving cable 4 can be inserted, and the contour shape of the insulating plug 3 with a voltage-feeding function is set to match this contour shape. Although not specifically shown, the cable head 1 is provided in a switchgear (C-GIS) serving as extra-high voltage receiving and transforming equipment, and is electrically connected to a main circuit for receiving and distributing electricity.

[0011] 1(a) and 1(b), the cable head 1 has a cable head main body 1p, a connection portion 2, and an internal electrode 5. The cable head main body 1p is molded from an electrically insulating material (e.g., epoxy resin), and the connection portion 2 and the internal electrode 5 are provided inside the cable head main body 1p.

[0012] The connection part 2 is electrically connected to the power receiving and distributing main circuit of the switchgear. The connection part 2 has an inner contour that matches the outer contour of the connection end 4t of the power receiving cable 4 (in other words, an inner contour that is the inverse of the outer contour). One end 2a of the connection part 2 is closed, and the other end 2b is open.

[0013] The connection tip 4t of the power receiving cable 4 is inserted from the open other end 2b (i.e., connection portion opening 2b) of the connection portion 2, and comes into contact with the closed one end 2a (i.e., connection portion end face 2a) of the connection portion 2. At this time, the connection tip 4t of the power receiving cable 4 is electrically connected to the power receiving and distribution main circuit of the switchgear via the connection portion 2.

[0014] The connecting portion 2 may be made of a conductive material throughout its entirety, or only a portion thereof may be made of a conductive material. As an example, in Figures 1(a) and (b), the connecting portion 2 is made of a conductive material in a portion near the connecting portion end face 2a (side), and the remaining portion is made of an electrically insulating material.

[0015] To achieve this configuration, the connection part 2 is configured by arranging the internal electrode 5 near the connection part end face 2a (side). In other parts, the connection part 2 is configured by a cable head main body 1p molded from an electrically insulating material (e.g., epoxy resin).

[0016] The internal electrode 5 is made of a conductive material (for example, gold, silver, copper, aluminum, iron, chromium, etc.). The internal electrode 5 is electrically connected to the connection tip 4t of the power receiving cable 4 inserted into the connection part 2. As a result, the connection tip 4t of the power receiving cable 4 and the power receiving and distribution main circuit of the switchgear are electrically connected to each other via the internal electrode 5 of the connection part 2.

[0017] Before the power company's power receiving cable 4 is connected, the connection portion 2 of the cable head 1 is kept sealed without any gaps by the insulating plug with voltage charging function 3. The insulating plug with voltage charging function 3 has an insulating plug main body 3p and a plurality of mounting members 6, 7 (see Figure 2 for the mounting member 7).

[0018] As shown in Figures 1(a) and 1(b), the insulating plug body 3p is removably attached to the connection part 2. The insulating plug body 3p has an outer contour that matches the inner contour of the connection part 2 (in other words, an outer contour that is the inverse of the inner contour). The insulating plug body 3p is configured so that a plurality of mounting members 6 and 7, which will be described later, can be removably attached to it. The multiple mounting members 6 and 7 have different functions, as will be described later.

[0019] The insulating plug body 3p has a facing surface 3a, an opposite surface 3b, and a contact surface 3c. When the insulating plug body 3p is attached to the connection part 2, the facing surface 3a faces the connection part 2 (specifically, the connection part end surface 2a formed by the internal electrode 5). The opposite surface 3b is positioned opposite the facing surface 3a and parallel to it. The contact surface 3c extends continuously between the facing surface 3a and the opposite surface 3b, and makes contact with the connection part 2 without any gaps.

[0020] Here, when the insulating plug body 3p is attached to the connection portion 2, the opposing surface 3a may be placed opposite the connection portion 2 (i.e., the connection portion end surface 2a) while being in contact with it, or the opposing surface 3a may be placed opposite the connection portion 2 (connection portion end surface 2a) without being in contact with it.

[0021] In this case, by facing the opposing surface 3a to the connection portion 2 (connection portion end surface 2a) without contacting it, it is possible to prevent malfunctions (e.g., damage or breakage) caused by external loads on the connection portion 2 (connection portion end surface 2a) when attaching the insulating plug main body 3p to the connection portion 2.

[0022] The material of the insulating plug body 3p can be selected appropriately from existing materials such as metal, synthetic resin, rubber, etc., as long as it can maintain a constant contour shape when attaching the insulating plug body 3p to the connection part 2 and can be in contact with the connection part 2 without any gaps.

[0023] In this case, the material of the insulating plug body 3p is preferably configured to be elastically deformable to fit the inner contour of the connection part 2. In this way, when the insulating plug body 3p is attached to the connection part 2, the contact surface 3c elastically deforms to fit the inner contour of the connection part 2. This allows the contact surface 3c of the insulating plug body 3p to adhere tightly to the connection part 2 without any gaps. As a result, the insulating plug 3 with voltage application function can seal the connection part 2 without any gaps.

[0024] In this state, the insulating plug body 3p is fitted with a non-conductive insulating mounting member 6. This allows the connection portion 2 of the cable head 1 to be sealed without any gaps by the insulating plug 3, which provides an insulating function. As a result, problems (such as damage or breakage) caused by external loads on the connection portion 2 are prevented.

[0025] Furthermore, the insulating plug 3 with voltage-applying function is configured so that voltage can be applied while the insulating plug 3 is attached. For this reason, the multiple mounting members 6, 7 include a non-conductive insulating mounting member 6 and a conductive voltage-applying mounting member 7. The insulating mounting member 6 can be made using an existing insulating material as is, while the voltage-applying mounting member 7 can be made using an existing conductive material as is, so there are no particular restrictions on the materials.

[0026] 2(a), (b), and (c) are diagrams showing the components of the insulating plug with voltage application function 3. Figures 2(a) to 2(c) show an example of a plurality of mounting members 6, 7 (non-conductive insulating mounting member 6, conductive voltage application mounting member 7), and each mounting member 6, 7 is set as a bolt 6, 7 (non-conductive insulating bolt 6, conductive voltage application bolt 7) extending straight from the base end Be to the tip end Te.

[0027] As shown in Figure 2(a), the insulating plug body 3p has a single through-hole 3h extending therethrough into which the bolts 6, 7 are removably threaded (mounted) one by one. The through-hole 3h is configured in the center of the insulating plug body 3p, passing straight through between the opposing surface 3a and the opposite surface 3b. For example, by cutting male threads into the bolts 6, 7 and female threads into the through-hole 3h, the bolts 6, 7 can be removably threaded along the through-hole 3h.

[0028] Here, the non-conductive insulating bolt 6 is set to a total length that does not protrude from the insulating plug body 3p when screwed into the insulating plug body 3p. As a result, when the insulating bolt 6 is screwed into the insulating plug body 3p, the base end Be of the insulating bolt 6 is engaged with the opposite surface 3b, and the tip end Te of the insulating bolt 6 is positioned so as not to exceed the opposing surface 3a.

[0029] In Figure 2(a), as an example, the tip Te of the insulating bolt 6 is positioned on the same plane as the opposing surface 3a of the insulating plug main body 3p, but instead, for example, the overall length of the insulating bolt 6 may be shortened so that the tip Te of the insulating bolt 6 is recessed (concave) below the opposing surface 3a of the insulating plug main body 3p.

[0030] 2(b) shows a conductive charging bolt 7 that is removably screwed into the through-hole 3h of the insulating plug main body 3p. The charging bolt 7 is provided with a contact part 8 (described later) at its tip Te, which makes it longer than the insulating bolt 6.

[0031] 2(c), the conductive charging bolt 7 is set to a total length that protrudes from the insulating plug body 3p when it is screwed into the insulating plug body 3p. As a result, when the charging bolt 7 is screwed into the insulating plug body 3p, the base end Be of the charging bolt 7 is engaged with the opposite surface 3b, and the tip end Te of the charging bolt 7 is positioned beyond the opposing surface 3a.

[0032] As shown in Figures 1 and 2(c), a conductive contact part 8 that can come into contact with the connection part 2 (connection part end surface 2a) is provided at the tip Te of the charging bolt 7. The contact part 8 is configured to be elastically deformable as a whole. The contact part 8 has, for example, a mesh structure in which conductive linear members (not shown) are alternately crossed.

[0033] As described above, according to this embodiment, by attaching the insulating plug main body 3p with the insulating bolt 6 threaded thereon to the connection portion 2 before connecting the power receiving cable 4 from the electric power company to the cable head 1 (connection portion 2), it is possible to prevent malfunctions (e.g., damage, breakdown) caused by external loads on the connection portion 2. Here, with the insulating plug main body 3p with the insulating bolt 6 threaded thereon attached to the connection portion 2, the insulating bolt 6 is removed and the voltage-charging bolt 7 is threaded into the insulating plug main body 3p. At this time, the contact portion 8 of the voltage-charging bolt 7 elastically contacts the connection portion 2 (connection portion end surface 2a), thereby electrically connecting the voltage-charging bolt 7 and the internal electrode 5 without causing malfunctions (e.g., damage, breakdown) caused by external loads on the connection portion 2 (connection portion end surface 2a). This allows voltage to be applied (i.e., a voltage to be applied) via the voltage-charging bolt 7 while the insulating plug main body 3p remains attached to the connection portion 2. As a result, a withstand voltage test (for example, a low-voltage phase detection test) can be performed on the portion where the connection tip 4t of the power receiving cable 4 and the connection portion 2 (connection portion end surface 2a) are electrically connected.

[0034] According to this embodiment, the insulating plug 3 with a voltage-applying function is composed of a three-piece set consisting of the insulating plug body 3p, the insulating bolt 6, and the voltage-applying bolt 7, and each part can be managed individually. This allows each part to be recycled and reused. As a result, an environmentally friendly insulating plug 3 with a voltage-applying function can be realized.

[0035] "Variations" Figure 3 is a diagram of a double insulation structure applied to an insulating plug 3 with a charging function. As an example, Figure 3 shows a double insulation structure that applies a non-conductive insulating cover 9. Note that the insulating cover 9 can be made using existing insulating materials as is, so there are no particular restrictions on the material.

[0036] As shown in Figure 3, the non-conductive insulating cover 9 is removably attached to the opposite surface 3b of the insulating plug body 3p so as to cover the base end Be of the insulating bolt 6 engaged with the opposite surface 3b when the insulating bolt 6 is screwed into the insulating plug body 3p.

[0037] In this case, the method of attaching the insulating cover 9 to the opposite surface 3b may be, for example, to prepare an elastically deformable insulating cover 9 and attach it by pushing it open and fitting it onto the opposite surface 3b, or to prepare a hard insulating cover 9 and attach it to the opposite surface 3b by screwing or gluing it.

[0038] As described above, according to this modification, by providing a double seal with the insulating bolt 6 and the insulating cover 9, it is possible to dramatically improve the dielectric strength when the insulating plug body 3p, to which the insulating bolt 6 is threaded, is attached to the connection part 2. The other configurations and effects are the same as those of the above-described embodiment, and therefore a description thereof will be omitted.

[0039] "Other Modifications" In the above-described embodiment and its modified examples, bolts 6, 7 have been described as an example of the mounting members 6, 7. However, instead of this, rod-shaped members (not shown), such as cylindrical, triangular prism-shaped, square prism-shaped, or polygonal prism-shaped members, may also be used as the mounting members 6, 7.

[0040] In this case, the inner contour of the through hole 3h that penetrates straight between the opposing surface 3a and the opposite surface 3b in the central portion of the insulating plug body 3p is also configured to be, for example, a cylindrical, triangular prism, a square prism, or a polygonal prism. This allows these rod-shaped members to be removably press-fitted into the through hole 3h. Note that other configurations and effects are the same as those of the above-mentioned embodiment, so a description thereof will be omitted.

[0041] Although one embodiment of the present invention and several modifications thereof have been described above, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments and modifications may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0042] Be...base end, Te...tip, 1...cable head, 1p...cable head main body, 2...connection part, 2a...one end (connection part end face), 2b...other end (connection part opening), 3...insulating plug with voltage charging function, 3p...insulating plug main body, 3a...opposite surface, 3b...opposite surface, 3c...contact surface, 3h...through hole, 4...receiving cable, 4t...connection tip, 5...internal electrode, 6...non-conductive insulating mounting member (insulating bolt), 7...conductive energized mounting member (energized bolt), 8...contact part, 9...insulating cover.

Claims

1. An insulating plug with a voltage charging function is provided on a cable head connected to a main circuit of a power receiving and transforming facility, and is capable of sealing a conductive connection part to which a predetermined power receiving cable is connected without any gaps, a non-conductive insulating plug body removably attached to the connecting portion; a plurality of mounting members each having a different function and removably mounted on the insulating plug body; The plurality of mounting members include a non-conductive insulating mounting member and a conductive charged mounting member, When the insulating plug body with the insulating mounting member attached is attached to the connection portion, the insulating mounting member can be removed and the charging mounting member can be attached to the insulating plug body, thereby enabling charging via the charging mounting member.

2. The insulating plug body is an opposing surface that faces the connection portion when attached to the connection portion; an opposite surface positioned opposite the facing surface; 2. The insulating plug with voltage application function according to claim 1, further comprising a contact surface that extends continuously between the opposing surface and the opposite surface and makes contact without gaps along the contour of the connecting portion.

3. The insulating mounting member extends from a proximal end to a distal end, An insulating plug with a voltage application function as described in claim 2, wherein when the insulating mounting member is attached to the insulating plug body, the base end of the insulating mounting member is engaged with the opposite surface, and the tip of the insulating mounting member is positioned so as not to extend beyond the opposing surface.

4. The insulating plug with voltage application function as described in claim 3 has a non-conductive insulating cover that is removably attached to the opposite surface of the insulating plug body so as to cover the base end of the insulating mounting member engaged with the opposite surface when the insulating mounting member is attached to the insulating plug body.

5. The voltage application member extends from a base end to a tip end, An insulating plug with a charging function as described in claim 2, wherein when the charging attachment member is attached to the insulating plug body, the base end of the charging attachment member is engaged with the opposite surface, and the tip of the charging attachment member is positioned beyond the opposing surface.

6. 6. The insulating plug with a voltage-applying function according to claim 5, wherein the tip of the voltage-applying attachment member is provided with a conductive contact portion that can come into contact with the connecting portion.

7. 7. The insulating plug with a voltage application function according to claim 6, wherein the contact portion is configured to be elastically deformable as a whole.

8. 8. The insulating plug with a voltage application function according to claim 7, wherein the contact portion has a mesh structure in which conductive linear members are alternately crossed.

9. The insulating plug with a voltage-applying function according to any one of claims 1 to 8 is applied to the cable head connected to the main circuit of the power receiving and transforming equipment, a cable head body having electrical insulation properties; the connecting portion is provided on the cable head body and is electrically conductive and to which the power receiving cable is connected; an internal electrode provided at the connection portion and electrically connected to the power receiving cable, When the insulating plug body with the insulating mounting member attached is attached to the connection portion, the insulating mounting member can be removed and the charging mounting member can be attached to the insulating plug body, whereby the charging mounting member is electrically connected to the internal electrode, thereby making it possible to charge a voltage via the charging mounting member.

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