WO2019175983A1 - Parafoudre en polymère - Google Patents

Parafoudre en polymère Download PDF

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Publication number
WO2019175983A1
WO2019175983A1 PCT/JP2018/009787 JP2018009787W WO2019175983A1 WO 2019175983 A1 WO2019175983 A1 WO 2019175983A1 JP 2018009787 W JP2018009787 W JP 2018009787W WO 2019175983 A1 WO2019175983 A1 WO 2019175983A1
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WO
WIPO (PCT)
Prior art keywords
wedge
shaped spacer
insulating rod
hole
lightning arrester
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Application number
PCT/JP2018/009787
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English (en)
Japanese (ja)
Inventor
富和 安食
良昌 阿嘉
純 小林
和長 金谷
水谷　学
Original Assignee
株式会社東芝
東芝エネルギーシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社東芝, 東芝エネルギーシステムズ株式会社 filed Critical 株式会社東芝
Priority to JP2020506000A priority Critical patent/JP7024062B2/ja
Priority to PCT/JP2018/009787 priority patent/WO2019175983A1/fr
Publication of WO2019175983A1 publication Critical patent/WO2019175983A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Definitions

  • the embodiment of the present invention relates to a polymer lightning arrester.
  • a lightning arrester is provided as the main means for protecting power generation equipment, power transformation equipment, power transmission equipment, power distribution equipment, and communication equipment from transient abnormal high voltage.
  • Non-linear resistors are used for the lightning arresters.
  • the non-linear resistor is made of zinc oxide having a non-linear voltage / current characteristic in which the resistance decreases as the voltage increases.
  • lightning arresters are roughly classified into insulator type lightning arresters in which a non-linear resistor is housed in a porcelain container, and polymer lightning arresters having a skin such as silicone rubber.
  • a polymer lightning arrester one in which one or a plurality of disk-shaped non-linear resistors mainly composed of zinc oxide are stacked and electrodes are arranged on the upper and lower ends is known.
  • an insulating rod for clamping is placed around a non-linear resistor sandwiched between electrodes, and the non-linear resistor is moved up and down by connecting the insulating rod and the electrode. Then, the non-linear resistor and the insulating rod are directly molded with silicone rubber or the like.
  • the insulating rod and the electrode are fixed by press-fitting an inclined hole provided in the electrode and a wedge-shaped spacer corresponding thereto, and applying a load to the non-linear resistor using a screw provided in the center of the electrode. Is often given.
  • Conventional polymer lightning arresters are made of a resin such as silicone rubber, so the mechanical strength as a lightning arrester depends on the strength of the insulating rods arranged around the non-linear resistor and the strength of the non-linear resistor itself. Therefore, the mechanical strength is low compared with the insulator type lightning arrester, and constant improvement in strength is required.
  • the strength of the non-linear resistor is limited because the strength is determined by the material characteristics. Therefore, as a measure for improving the strength of the polymer lightning arrester, the fastening force of the electrode and the insulating rod is mainly strengthened, but further strength improvement is required.
  • the problem to be solved by the present invention is to provide a polymer lightning arrester capable of further improving the mechanical strength.
  • the polymer lightning arrester of the embodiment has a non-linear resistor, two electrodes, a plurality of insulating rods, a wedge-shaped spacer, a polytetrafluoroethylene sheet, and a resin coating.
  • the electrodes are respectively disposed on the upper end surface side and the lower end surface side of the non-linear resistor and have a plurality of through holes.
  • Insulating rods extend between the electrodes, are circumferentially spaced around the non-linear resistor, and are inserted into the through holes of the electrodes.
  • the wedge-shaped spacer is inserted between the insulating rod and the inner wall surface of the through hole to fix the insulating rod to the electrode.
  • the polytetrafluoroethylene sheet is inserted between the wedge-shaped spacer and the inner wall surface of the through hole.
  • the resin cover covers the non-linear resistor and the insulating rod.
  • the through hole of the electrode penetrates the electrode along the longitudinal direction of the insulating rod. At least a part of the inner wall surface of the through hole is a tapered portion that gradually decreases the inner diameter of the through hole toward the longitudinal center side of the insulating rod.
  • the wedge-shaped spacer includes a wedge portion having a wedge shape in which the thickness gradually decreases toward the longitudinal center of the insulating rod. The wedge portion is inserted between the tapered portion of the through hole and the insulating rod.
  • the polytetrafluoroethylene sheet is sandwiched between the tapered portion of the through hole and the wedge-shaped spacer.
  • the longitudinal cross-sectional schematic diagram which shows the polymer lightning arrester of embodiment The plane schematic diagram which shows the principal part of the polymer lightning arrester of embodiment.
  • the longitudinal cross-sectional schematic diagram which shows the assembly process of the polymer lightning arrester of embodiment.
  • the longitudinal cross-sectional schematic diagram which shows the assembly process of the polymer lightning arrester of embodiment.
  • the longitudinal cross-sectional schematic diagram which shows the assembly process of the polymer lightning arrester of embodiment.
  • the insulating rod of the polymer lightning arrester is fixed using a through-hole provided in the electrode and a wedge-shaped spacer corresponding to the shape of the through-hole.
  • a wedge-shaped spacer is press-fitted into the through hole of the electrode in which the insulating rod is inserted in order to firmly fix the insulating rod to the electrode.
  • the frictional force between the inner wall surface of the through hole of the electrode and the wedge-shaped spacer may be affected by the surface roughness and vary for each wedge-shaped spacer.
  • the present inventors have examined that a polytetrafluoroethylene sheet for stabilizing friction force between the inner wall surface of the through hole and the wedge-shaped spacer when the wedge-shaped spacer is press-fitted into the through-hole of the electrode. Insertion inserts can stabilize the fastening force of individual insulating rods and prevent resin from entering between the wedge-shaped spacer and the inner wall surface of the through-hole of the electrode, ensuring reliable mechanical strength. We found that we can provide a high polymer lightning arrester.
  • the polymer lightning arrester 1 of this embodiment includes a non-linear resistor 2, two electrodes 3, 4 disposed on the upper and lower ends of the non-linear resistor 2, and two electrodes 3, 4 A plurality of insulating rods 5 extending in between, a wedge-shaped spacer 6 for fastening the electrodes 3, 4 and the insulating rod 5, a polytetrafluoroethylene sheet (not shown), and a resin cover 7 are provided.
  • the polymer lightning arrester 1 further includes metal plates 8 and 9 disposed between the non-linear resistor 2 and the electrodes 3 and 4, and both screw bolts 10 for coupling the electrodes 3 and 4 and the metal plates 8 and 9, respectively. , 11 are provided.
  • a plurality of non-linear resistors 2 are stacked.
  • One non-linear resistor 2 is a disk-shaped sintered body portion containing zinc oxide as a main component.
  • a metal electrode portion such as aluminum (not shown) is provided on the upper and lower flat surfaces of the non-linear resistor 2.
  • an insulating layer (not shown) is provided on the side surface (cylindrical surface).
  • the non-linear resistor 2 is insulative when a normal voltage is applied, and becomes conductive when an abnormal voltage higher than the normal voltage is applied.
  • the non-linear resistor 2 is not limited to a plurality, and only one non-linear resistor 2 may be provided.
  • An insulating plate 12 is inserted at the center in the vertical direction of the laminate composed of a plurality of non-linear resistors 2.
  • the insulating plate 12 is provided with a plurality of through holes (not shown), and the insulating rod 5 is inserted into the through holes. Since the insulating rod 5 penetrates the insulating plate 12, the displacement of the insulating rod 5 is prevented.
  • the metal plates 8 and 9 are installed on each of the upper end surface 2a and the lower end surface 2b of the laminate in which a plurality of non-linear resistors 2 are laminated.
  • the metal plates 8 and 9 have the same outer diameter as the non-linear resistor 2.
  • the metal plate 8 installed on the upper end surface 2a side of the non-linear resistor 2 has a square bar shape and has a second female at its center.
  • a screw hole 8b is provided.
  • a cylindrical shape may be used instead of the square bar shape.
  • a second female screw hole 8b is provided at the center.
  • the 2nd female screw hole 8b is comprised from the opening hole 8a provided in the metal plate 8, and the internal thread formed in the inner surface of the opening hole 8a.
  • the opening hole 8 a of the metal plate 8 penetrates along the lamination direction of the non-linear resistor 2.
  • a second male screw portion 10a is screwed into the second female screw hole 8b in both screw bolts 10 described later.
  • the metal plate 9 installed on the lower end surface 2b side of the non-linear resistor 2 is formed in the same manner as the metal plate 8 installed on the upper end surface 2a side. That is, the metal plate 9 installed on the lower end surface 2b side has a square bar shape, and an opening hole 9a is provided at the center.
  • a female screw is formed on the inner peripheral surface of the opening hole 9 a of the metal plate 9.
  • a second female screw hole 9b is constituted by the opening hole 9a in which the female screw is formed. As shown in FIG. 1, the second male screw portion 11 a of both screw bolts 11 is screwed into the second female screw hole 9 b.
  • the metal plate 9 may have a cylindrical shape instead of a square bar shape.
  • the electrodes 3 and 4 are disposed on the upper end surface 2 a and the lower end surface 2 b of the multilayer body in which a plurality of non-linear resistors 2 are laminated via metal plates 8 and 9, respectively. .
  • the electrodes 3 and 4 have an outer diameter larger than that of the non-linear resistor 2.
  • the electrode 3 installed on the upper end surface 2a side is provided with a first female screw hole 3e at the center thereof.
  • the first female screw hole 3e includes an opening hole 3a provided at the center of the electrode 3 and a female screw provided on the inner surface of the opening hole 3a.
  • a plurality of through holes 3b are arranged at equal intervals around the opening hole 3a.
  • the opening hole 3 a provided in the electrode 3 penetrates along the lamination direction of the non-linear resistor 2.
  • the first male screw portion 10b of both screw bolts 10 is screwed into the first female screw hole 3e formed of the opening hole 3a.
  • the plurality of through holes 3 b provided around the opening hole 3 a in the electrode 3 penetrate along the lamination direction of the non-linear resistor 2 or the extending direction of the insulating rod 5. ing.
  • the end 5a of the insulating rod 5 is inserted into the through hole 3b, and a wedge-shaped spacer 6 is inserted on the outer periphery of the insulating rod 5 inside the through hole 3b.
  • the inner wall surface 3c of the through hole 3b of the electrode 3 is provided with a tapered portion 3d that gradually decreases the inner diameter of the through hole 3b toward the longitudinal center of the insulating rod 5.
  • the tapered portion 3d is oriented so that the non-linear resistor 2 side is a small diameter hole.
  • the other electrode 4 installed on the lower end surface 2b side is formed in the same manner as the electrode 3 installed on the upper end surface 2a side. That is, the electrode 4 is provided with an opening hole 4a at the center thereof, and a plurality of through holes 4b are arranged at equal intervals around the opening hole 4a. A tapered portion 4d that gradually decreases the inner diameter of the through hole 4b toward the center in the longitudinal direction of the insulating rod 5 is provided on the inner wall surface of the plurality of through holes 4b. A female screw is provided on the inner surface of the opening hole 4a.
  • the first female screw hole 4e is constituted by the opening hole 4a and the female screw provided on the inner surface thereof.
  • the material of the electrodes 3 and 4 is not particularly limited, but it is preferable to use an aluminum alloy. More specifically, a JIS 5000 alloy (Al—Mg alloy) or a JIS 6000 alloy (Al—Mg—Si alloy) may be used.
  • Both screw bolts 10 and 11 fasten the metal plates 8 and 9 and the electrodes 3 and 4 as shown in FIG.
  • Both screw bolts 10 and 11 have left screw portions 10a and 11a (first male screw portions) and right screw portions 10b and 11b (second male screw portions) whose fastening directions are opposite to the left screw portions 10a and 11a. ) And a central portion 10c.
  • left screw portions 10 a and 11 a and right screw portions 10 b and 11 b are coaxially arranged along the stacking direction of the non-linear resistor 2 via the central portions 10 c and 11 c. Yes.
  • the left screw portions 10a and 11a are attached to the opening holes 8a and 9a provided at the centers of the metal plates 8 and 9, respectively.
  • the left screw portions 10a and 11a are rotated in the counterclockwise direction, thereby proceeding to the back (in the direction of the non-linear resistor 2 in FIG. 1) inside the opening holes 8a and 9a.
  • the right screw portions 10b and 11b are attached to the opening holes 3a and 4a provided at the centers of the electrodes 3 and 4, respectively.
  • the right screw portions 10b and 11b are rotated in the opposite direction to the left screw portions 10a and 11a, that is, in the clockwise direction, so that the inner side of the opening holes 3a and 4a (in FIG. Direction).
  • the screw bolts 10 and 11 are provided with fastening holes 10d and 11d on the top surface on the side where the right screw portions 10b and 11b are provided.
  • the fastening holes 10d and 11d are hexagonal holes, for example.
  • the insulating rod 5 is a rod-like body and extends along the stacking direction of the non-linear resistor 2 as shown in FIG.
  • the insulating rod 5 has a diameter of, for example, 10 mm or more, and is formed of FRP (Fiber-Reinforced Plastics (fiber reinforced plastic)).
  • the insulating rod 5 is installed on the side surface (outer peripheral surface) of the non-linear resistor 2 and the metal plates 8 and 9.
  • one end 5 a and the other end 5 b are inserted into through holes 3 b and 4 b provided in the electrodes 3 and 4.
  • the insulating rod 5 is inserted into a through hole (not shown) provided in the insulating plate 12.
  • the insulating rods 5 are arranged in a predetermined number around the outer peripheral surface of the laminated body of the non-linear resistor 2 and the metal plates 8 and 9 at equal intervals. Yes.
  • the wedge-shaped spacer 6 is installed inside the through holes 3 b and 4 b provided in the electrodes 3 and 4.
  • the wedge-shaped spacer 6 is interposed between the tapered portions 3d and 4d of the inner wall surfaces 3c and 4c of the through holes 3b and 4b and the outer peripheral surface of the insulating rod 5 inside the through holes 3b and 4b.
  • a polytetrafluoroethylene sheet 13 is inserted between the tapered portions 3d and 4d of the inner wall surfaces 3c and 4c of the through holes 3b and 4b and the wedge-shaped spacer 6.
  • the polytetrafluoroethylene sheet 13 is sandwiched between the tapered portions 3 d and 4 d and the wedge-shaped spacer 6.
  • the thickness of the polytetrafluoroethylene sheet 13 is in the range of 0.1 mm to 0.2 mm.
  • the wedge-shaped spacer 6 has a shape that becomes a hollow cylindrical body when the three wedge-shaped spacers 6 are combined. Also in the through holes 3b and 4b, the arrangement is as shown in FIG.
  • the insulating rod 5 is disposed in the hollow portion of the hollow cylindrical body.
  • Each wedge-shaped spacer 6 has an inner surface 6a that contacts the insulating rod 5, and an outer surface 6b that faces the tapered portions 3d and 4d of the through holes 3b and 4b.
  • the inner surface 6 a is a concave curved surface whose curvature radius does not change along the longitudinal direction of the wedge-shaped spacer 6.
  • the outer surface 6 b is a convex taper surface with a radius of curvature that decreases toward the distal end in the longitudinal direction of the wedge-shaped spacer 6.
  • the wedge-shaped spacer 6 has a wedge portion 6c whose thickness decreases toward the lower side in the drawing when the longitudinal section is viewed along the longitudinal direction. Further, a notch portion 6 d is provided on the base end side in the longitudinal direction of the wedge-shaped spacer 6.
  • the surface roughness Ra of the inner surface 6a in contact with the insulating rod 5 is preferably larger than the surface roughness Ra of the outer surface 6b facing the inner wall surfaces 3c, 4c.
  • the static friction coefficient between the wedge-shaped spacer 6 and the insulating rod 5 is improved.
  • the inner surface 6a may be subjected to a blasting process, and the outer surface 6b may not be subjected to a blasting process.
  • silicone resin may enter between the outer surface 6b and the contact surface of the polytetrafluoroethylene sheet 13 when the lightning arrester is molded with silicone rubber in the manufacturing process. Whether or not a blast surface is applied can be determined by measuring the surface shape of the inner surface 6a of the wedge-shaped spacer 6 with a surface shape measuring machine.
  • the inclination angle ⁇ 2 ( ⁇ 1 ⁇ 2 ) is preferably in the range of 0 to 0.6 °.
  • the material of the wedge-shaped spacer 6 is not particularly limited, but it is preferable to use an aluminum alloy. More specifically, as the aluminum alloy, for example, a JIS 5000 alloy (Al—Mg alloy), a JIS 6000 alloy (Al—Mg—Si alloy), an aluminum die cast product ADC12, or the like can be used.
  • FIG. 5 is a plan view showing a state in which the polytetrafluoroethylene sheet 13 and the wedge-shaped spacer 6 shown in FIG. 4 are inserted into the through holes 3b and 4b.
  • the polytetrafluoroethylene sheet 13 is also present between the wedge-shaped spacers 6 by inserting one polytetrafluoroethylene sheet 13 into the through holes 3 b and 4 b.
  • the polytetrafluoroethylene sheet 13 is in contact with the tapered portions 3 d and 4 d of the through holes 3 b and 4 b and is not in contact with the outer surface 6 b of the wedge-shaped spacer 6.
  • the polytetrafluoroethylene sheet 13 is not limited to the form shown in FIGS.
  • the polytetrafluoroethylene sheet 13 may be interposed only between the tapered portions 3 d and 4 d of the through holes 3 b and 4 b and the outer surface 6 b of the wedge-shaped spacer 6.
  • three polytetrafluoroethylene sheets 13 are inserted into the through holes 3b and 4b.
  • an adhesive layer may be provided between the polytetrafluoroethylene sheet 13 and the wedge-shaped spacer 6. As a result, the polytetrafluoroethylene sheet 13 and the wedge-shaped spacer 6 are bonded to each other.
  • the resin-made covering body 7 covers the outer peripheral surface of the laminated body of the insulating rod 5 and the non-linear resistor 2 on which the insulating rod 5 is disposed.
  • the resin cover 7 is formed by molding an insulating resin such as silicone rubber.
  • the electrode 3 and the metal plate 8 are fastened and integrated with both screw bolts 10.
  • the screw bolt 10 is attached to the electrode 3 by screwing the right screw portion 10 b of the screw bolt 10 into the opening hole 3 a provided in the electrode 3.
  • the screw bolt 10 is attached to the metal plate 8 by screwing the left screw portion 10 a of the screw screw 10 into the opening hole 8 a of the metal plate 8. In this way, a combination of the metal plate 8 and the electrode 3 is formed.
  • FIG. 7 the electrode 3 and the metal plate 8 are fastened and integrated with both screw bolts 10.
  • a plurality of insulating rods 5 are attached to a combination of the metal plate 9 and the electrode 4 installed on the lower end surface 2 b side, and a plurality of insulating rods 5 are installed in a space surrounded by the insulating rods 5.
  • the non-linear resistors 2 are stacked.
  • the insulating plate 12 is appropriately interposed between the plurality of non-linear resistors 2.
  • a combination of the metal plate 8 and the electrode 3 installed on the upper end surface 2 a side is attached to the plurality of insulating rods 5.
  • the attached state is shown in FIG.
  • the end 5 a of the insulating rod 5 is inserted into the through hole 3 b of the electrode 3.
  • the end 5b of the insulating rod 5 is also inserted into the through hole 4b of the electrode 4.
  • the insulating rod 5 is fastened to the electrodes 3 and 4 using the wedge-shaped spacer 6 and the polytetrafluoroethylene sheet 13.
  • the wedge-shaped spacer 6 and the polytetrafluoroethylene sheet 13 are inserted into the through hole 3b of the electrode 3 into which the end 5a of the insulating rod 5 is inserted.
  • the wedge-shaped spacer 6 and the polytetrafluoroethylene sheet 13 are interposed.
  • the wedge portion 6 c When inserting the wedge-shaped spacer 6, the wedge portion 6 c is inserted toward the longitudinal center of the insulating rod 5. Further, in the wedge-shaped spacer 6, the inner surface 6 a may be subjected to a blast process to be a blast surface, while the outer surface 6 b may not be subjected to a blast process. Thereby, the surface roughness Ra of the inner surface 6a in contact with the insulating rod 5 becomes larger than the surface roughness Ra of the outer surface 6b facing the inner wall surfaces 3c, 4c.
  • a polytetrafluoroethylene sheet having an adhesive layer formed on one side is prepared.
  • the surface of the polytetrafluoroethylene sheet on the adhesive layer side is set to the wedge-shaped spacer 6 side.
  • the polytetrafluoroethylene sheet 13 and the wedge-shaped spacer 6 are inserted into the through holes 3b and 4b.
  • the difference between the 2 ( ⁇ 1 - ⁇ 2) is, it is preferable to adjust the range of 0 ⁇ 0.6 °, and more preferably adjusted to the range of 0 ⁇ 0.4 °.
  • the wedge-shaped spacer 6 and the polytetrafluoroethylene sheet 13 are press-fitted into the through hole 3b while the relative position between the insulating rod 5 and the electrode 3 is fixed. More specifically, a jig (not shown) is inserted from the large diameter side of the tapered portion 3d, and the jig is applied to the notch portion 6d of the wedge-shaped spacer 6. Next, the jig is pushed in, and the wedge-shaped spacer 6 is further pushed in.
  • the wedge-shaped spacer 6 when the wedge-shaped spacer 6 is pushed, the polytetrafluoroethylene sheet 13 is compressed in the thickness direction. Thereby, the outer surface 6b of the wedge-shaped spacer 6 and the polytetrafluoroethylene sheet 13 are in close contact with each other without a gap. Similarly, the polytetrafluoroethylene sheet 13 and the tapered portion 3d of the through hole 3b are in close contact with each other without a gap.
  • both the metal plate 8 and the electrode 3 are connected by the both screw bolts 10.
  • a left screw portion 10 a of both screw bolts 10 is attached to the metal plate 8.
  • the right threaded portion 10b of both screw bolts 10 is attached to the electrode 3.
  • the screw bolts 11 are tightened in the same manner as described above for the combination of the metal plate 9 and the electrode 4 installed on the lower end side.
  • the outer peripheral surface of the laminated body of the non-linear resistors 2 on which the insulating rods 5 are arranged is covered with a resin cover 7.
  • the resin cover 7 is provided by molding an insulating resin such as silicone rubber.
  • the end portions 5a and 5b of the insulating rod 5 are inserted into the through holes 3b and 4b of the electrodes 3 and 4 having the tapered portions 3d and 4d, and the insulating rod 5 and the through hole 3b are inserted.
  • the wedge-shaped spacer 6 is disposed between the tapered portions 3d and 4d of 4b, and the polytetrafluoroethylene sheet 13 is further inserted between the wedge-shaped spacer 6 and the tapered portions 3d and 4d. The frictional force between the tapered portions 3d and 4d is reduced, and the wedge-shaped spacer 6 is reliably pushed to a predetermined position.
  • the insulating rod 5 is firmly clamped by the wedge-shaped spacer 6, and the electrodes 3, 4 and the insulating rod 5 can be strongly fastened.
  • the fastening force between the electrodes 3 and 4 and the insulating rod 5 can be made higher than the breaking strength of the insulating rod 5.
  • the fastening force of the insulating rod 5 does not vary between the through holes 3b and 4b. To be constant.
  • a bending stress is applied to the polymer lightning arrester 1
  • a tensile stress is applied to the insulating rod 5 positioned on the outer side in the bending direction
  • a compressive stress is applied to the insulating rod 5 positioned on the inner side in the bending direction.
  • the fastening force of the insulating rod 5 is constant in all the through holes 3b and 4b and the fastening force exceeds the breaking strength of the insulating rod 5, before the breaking of the insulating rod 5, the insulating rod 5 and the electrode There is no fear that the fastening portions with 3 and 4 are broken, and the bending strength of the polymer lightning arrester 1 can be greatly increased.
  • the inner wall surfaces 3c and 4c of the through holes 3b and 4b of the electrodes 3 and 4 are tapered portions 3d and 4d that gradually reduce the inner diameters of the through holes 3b and 4b toward the longitudinal center of the insulating rod 5.
  • the wedge-shaped spacer 6 has a wedge-shaped wedge portion 6c whose thickness is gradually reduced toward the longitudinal center of the insulating rod 5, and the wedge portion 6c is a tapered portion 3d, 4d of the through holes 3b, 4b.
  • the insulating rod 5, the insulating rod 5 can be strongly fastened by the wedge-shaped spacer 6 when a tensile load is applied to the insulating rod 5, and the bending strength of the polymer lightning arrester 1 can be further increased. it can.
  • the polytetrafluoroethylene sheet 13 is compressed in the thickness direction.
  • the polytetrafluoroethylene sheet 13 can be brought into close contact with the tapered portions 3d and 4d of the through holes 3b and 4b and the wedge-shaped spacer 6. Accordingly, there is no possibility that a gap is generated between the wedge-shaped spacer 6 and the tapered portions 3d and 4d of the through holes 3b and 4b.
  • the fastening force of the insulating rod 5 can be further increased.
  • the thickness of the polytetrafluoroethylene sheet 13 is in the range of 0.1 mm to 0.2 mm, the fastening force of the insulating rod 5 can be further increased.
  • the thickness of the polytetrafluoroethylene sheet 13 is set to 0.1 mm or more, the polytetrafluoroethylene sheet 13 can be prevented from being broken and the effect of reducing the frictional force can be sufficiently exhibited.
  • the thickness is set to 0.2 mm or less, excessive deformation of the polytetrafluoroethylene sheet 13 can be prevented, and the insulating rod 5 can be fastened stably.
  • the wedge-shaped spacer 6 is appropriately deformed when the wedge-shaped spacer 6 is press-fitted, the insulating rod 5 and the wedge-shaped spacer 6 are in close contact, and stress concentration on the insulating rod 5 is reduced. While being able to relieve, the penetration
  • the material is hard, so that the shape of the wedge-shaped spacer 6 is not easily deformed during press-fitting, and the two are locally in contact with each other due to a slight difference in dimensions between the insulating rod 5 and the wedge-shaped spacer 6. Become. Thereby, there exists a possibility of becoming an overload compressive force with respect to the insulating rod 5.
  • FIG. In the case of the wedge-shaped spacer 6 made of an aluminum alloy, the wedge-shaped spacer 6 is appropriately deformed at the time of press-fitting, so that the wedge-shaped spacer 6 fits into the insulating rod 5 and ensures a large contact area between the insulating rod 5 and the wedge-shaped spacer 6. And local stress concentration generated between the wedge-shaped spacers 6 can be dispersed. Further, it can be expected that the insulating rod 5 and the wedge-shaped spacer 6 are in close contact with each other to prevent silicone rubber from entering the contact surface.
  • the wedge-shaped spacer 6 and the insulating rod 5 are made to have a surface roughness Ra of the inner surface 6a on the insulating rod 5 side of the wedge-shaped spacer 6 larger than the surface roughness Ra of the outer surface 6b on the inner wall surface 3c, 4c side of the through hole. And the insulating rod 5 can be fastened more stably.
  • the metal plates 8 and 9 are separated from the electrodes 3 and 4 by using both screw bolts 10 and 11 used for fastening the electrodes 3 and 4 and the metal plates 8 and 9. While applying a compressive load to the non-linear resistor 2, a tensile load is applied between the insulation rod 5 that has been fastened and the electrodes 3 and 4, thereby further increasing the fastening force of the insulation rod 5 by the wedge-shaped spacer 6. Can be increased.
  • the mechanical strength of the polymer lightning arrester can be further improved by having the polytetrafluoroethylene sheet sandwiched between the wedge-shaped spacer and the tapered portion of the through hole.
  • Comparative Example 1 is a conventional polymer lightning arrester that does not have a polytetrafluoroethylene sheet
  • Example 1 is a polymer lightning arrester that has a polytetrafluoroethylene sheet.
  • the thickness of the polytetrafluoroethylene sheet was 0.13 mm
  • an adhesive layer was interposed between the polytetrafluoroethylene sheet and the wedge-shaped spacer.
  • the material of the electrode and the wedge-shaped spacer was a JIS 5000 series alloy (Al—Mg series alloy) in both Example 1 and Comparative Example 1.
  • Six polymer lightning arresters of Example 1 and Comparative Example 1 were manufactured.
  • the bending destruction test of the lightning arrester was implemented.
  • the lightning arrester as the test object was leveled and firmly supported at one end. Thereafter, a force was applied to the other end at a certain rate in the vertical direction. At the same time, the internal elements of the lightning arrester were observed, and the force when an abnormality such as a crack was observed in any part was taken as the bending fracture moment value.
  • Example 1 The results of the bending fracture test are shown in Table 1.
  • the bending fracture moment value is in the range of 2310 to 4041 Nm, and the variation is large. In Example 1, however, the bending fracture moment value is 3943 Nm or more and a high bending load is maintained. The variation in values was small and good results were obtained.
  • the polytetrafluoroethylene sheet has a constant coefficient of friction during press-fitting between the electrode and the wedge-shaped spacer, resulting in uniform fastening force for each of the plurality of insulating rods, resulting in strength. It is presumed that the variation in the surface was suppressed.
  • Comparative Example 1 the breakage point when the bending load was increased was the fastening point between the insulating rod and the electrode, or the breakage of the rod itself, which was different for each tester.
  • Comparative Example 1 in particular, fracture occurred at the fastening portion between the insulating rod and the electrode when the bending fracture moment was in the range of 2000 to 3000 Nm.
  • the insulating rod is broken. This is because the polytetrafluoroethylene sheet ensures that the wedge-shaped spacer is pushed in and the fastening force for each insulating rod is stabilized, and the silicone rubber intrusion between the electrode and the spacer is eliminated in the molding process. It is presumed that the fastening force of the insulating rod did not change before and after the molding process, and a reliable fastening force was obtained.
  • Example 2 the polymer lightning arrester of Example 2 was manufactured in the same manner as in Example 1 except that the inner surface of the wedge-shaped spacer was blasted to make the inner surface roughness Ra larger than the outer surface roughness. Moreover, the polymer lightning arrester of the comparative example 2 was manufactured like the said Example 1 except having performed the blast process to the inner surface and outer surface of the wedge-shaped spacer, and making both the inner surface and the outer surface into a blast surface.
  • the polymer lightning arrester was cut after molding with silicone rubber, and a single tensile test was performed between the electrode and the insulating rod fastened to the electrode. As test conditions, the insulating rod was pulled at a speed of 5 mm / min, the load was increased until the load decreased, and the displacement and the load were recorded. In this test, if the insulating rod breaks before slippage occurs between the wedge-shaped spacer and the insulating rod, the fastening force is higher than the breaking strength of the insulating rod, and the weakest point of the polymer lightning arrester breaks the insulating rod. Therefore, it can be said that the fastening structure has a sufficient fastening force.
  • the inclination angle theta 1 of the tapered portion with respect to the axial direction of the through hole is 4 °
  • the inclination angle theta 2 of the surface of the inner wall surface of the through hole of the wedge-shaped spacer with respect to the axial direction of the wedge-shaped spacer was 4 °.
  • Table 2 shows the results of unit tensile tests of Example 1, Example 2, and Comparative Example 2.
  • Table 3 shows the results of the single tensile test for the lightning arrester.
  • the conditions for the single tensile test are the same as in Table 2.
  • SYMBOLS 1 Polymer lightning arrester, 2 ... Nonlinear resistor, 2a ... Upper end surface, 2b ... Lower end surface, 3, 4 ... Electrode, 3b, 4b ... Through-hole, 3c, 4c ... Inner wall surface, 3d, 4d ... Tapered part, 3e 4e ... 1st female screw hole, 5 ... Insulating rod, 6 ... Wedge-shaped spacer, 6c ... Wedge part, 7 ... Resin covering, 8, 9 ... Metal plate, 8b, 9b ... 2nd female screw hole, 10, DESCRIPTION OF SYMBOLS 11 ... Both screw bolt, 10a, 11a ... 1st male thread part (left-hand thread part), 10b, 11b ... 2nd male thread part (right-hand thread part), 13 ... Polytetrafluoroethylene sheet

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Insulators (AREA)

Abstract

Le parafoudre en polymère selon un mode de réalisation de la présente invention comporte une résistance non linéaire, deux électrodes, une pluralité de tiges isolées, des entretoises en forme de coin, des feuilles de polytétrafluoroéthylène et un revêtement de résine. Les électrodes sont respectivement disposées sur le côté surface d'extrémité supérieure et le côté surface d'extrémité inférieure de la résistance non linéaire et ont une pluralité de trous traversants. Les tiges isolées s'étendent entre les électrodes, sont disposées autour de la résistance non linéaire à des intervalles dans la direction périphérique, et sont insérées dans les trous traversants des électrodes. Les entretoises en forme de coin sont insérées entre les tiges isolées et les surfaces de paroi interne des trous traversants, et fixent les tiges isolées aux électrodes. Les feuilles de polytétrafluoroéthylène sont insérées entre les entretoises en forme de coin et les surfaces de paroi interne des trous traversants. Le revêtement de résine recouvre la résistance non linéaire et les tiges isolées. Les trous traversants dans les électrodes pénètrent à travers les électrodes dans la direction longitudinale des tiges isolées. Au moins une partie des surfaces de paroi interne des trous traversants est formée sous la forme d'une partie effilée dans laquelle le diamètre intérieur des trous traversants diminue progressivement vers le côté central longitudinal des tiges isolées. Les entretoises en forme de coin ont une partie de coin ayant une section transversale en forme de coin dans laquelle l'épaisseur de paroi diminue progressivement vers le côté du centre longitudinal des tiges isolées. Les parties de coin sont insérées entre les parties effilées des trous traversants et les tiges isolées. Les feuilles de polytétrafluoroéthylène sont intercalées entre les parties effilées des trous traversants et les entretoises en forme de coin.
PCT/JP2018/009787 2018-03-13 2018-03-13 Parafoudre en polymère WO2019175983A1 (fr)

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JP2020506000A JP7024062B2 (ja) 2018-03-13 2018-03-13 ポリマー避雷器
PCT/JP2018/009787 WO2019175983A1 (fr) 2018-03-13 2018-03-13 Parafoudre en polymère

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PCT/JP2018/009787 WO2019175983A1 (fr) 2018-03-13 2018-03-13 Parafoudre en polymère

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535292A (en) * 1978-08-31 1980-03-12 Instron Corp Material tester
JPH0913672A (ja) * 1995-07-04 1997-01-14 P S Co Ltd Ｆｒｐ緊張材、その定着方法及び定着具
JP2009515104A (ja) * 2005-11-02 2009-04-09 エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング テーパボルト接続装置及びその使用方法
JP2013115251A (ja) * 2011-11-29 2013-06-10 Mitsubishi Electric Corp 避雷器
WO2018002966A1 (fr) * 2016-06-30 2018-01-04 株式会社 東芝 Parafoudre en polymère et procédé de fabrication de celui-ci
JP2018056564A (ja) * 2016-09-27 2018-04-05 シーメンス アクチエンゲゼルシヤフトＳｉｅｍｅｎｓ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ サージアレスタ用連結装置、サージアレスタの製造方法およびサージアレスタ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535292A (en) * 1978-08-31 1980-03-12 Instron Corp Material tester
JPH0913672A (ja) * 1995-07-04 1997-01-14 P S Co Ltd Ｆｒｐ緊張材、その定着方法及び定着具
JP2009515104A (ja) * 2005-11-02 2009-04-09 エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング テーパボルト接続装置及びその使用方法
JP2013115251A (ja) * 2011-11-29 2013-06-10 Mitsubishi Electric Corp 避雷器
WO2018002966A1 (fr) * 2016-06-30 2018-01-04 株式会社 東芝 Parafoudre en polymère et procédé de fabrication de celui-ci
JP2018056564A (ja) * 2016-09-27 2018-04-05 シーメンス アクチエンゲゼルシヤフトＳｉｅｍｅｎｓ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ サージアレスタ用連結装置、サージアレスタの製造方法およびサージアレスタ

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