CN114512377B - Fuse for high voltage fuse - Google Patents
Fuse for high voltage fuse Download PDFInfo
- Publication number
- CN114512377B CN114512377B CN202110319932.2A CN202110319932A CN114512377B CN 114512377 B CN114512377 B CN 114512377B CN 202110319932 A CN202110319932 A CN 202110319932A CN 114512377 B CN114512377 B CN 114512377B
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- China
- Prior art keywords
- fuse
- head
- diameter portion
- arc
- arc extinguishing
- Prior art date
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 95
- 239000002184 metal Substances 0.000 claims abstract description 95
- 230000002093 peripheral effect Effects 0.000 claims description 60
- 230000001629 suppression Effects 0.000 claims description 55
- 238000007789 sealing Methods 0.000 description 22
- 239000012212 insulator Substances 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 description 1
- PQIJHIWFHSVPMH-UHFFFAOYSA-N [Cu].[Ag].[Sn] Chemical compound [Cu].[Ag].[Sn] PQIJHIWFHSVPMH-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- XRBURMNBUVEAKD-UHFFFAOYSA-N chromium copper nickel Chemical compound [Cr].[Ni].[Cu] XRBURMNBUVEAKD-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- CLDVQCMGOSGNIW-UHFFFAOYSA-N nickel tin Chemical compound [Ni].[Sn] CLDVQCMGOSGNIW-UHFFFAOYSA-N 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229910000969 tin-silver-copper Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/042—General constructions or structure of high voltage fuses, i.e. above 1000 V
Landscapes
- Fuses (AREA)
Abstract
The invention provides a novel fuse for a high voltage fuse. The fuse for a high voltage fuse includes: the arc extinguishing pipe comprises a head metal piece, a lower connecting wire, a fusible connecting wire connected between the head metal piece and the lower connecting wire and a cylindrical arc extinguishing pipe surrounding the fusible connecting wire. The head metal piece has a head portion and a columnar portion. The top of the head is positioned outside the arc extinguishing pipe. The columnar portion extends from the head top toward the inside of the arc extinguishing pipe. An annular internal pressure adjusting member is fixed to the columnar portion in the arc extinguishing pipe, and the arc extinguishing pipe is fixed to the head metal fitting by the internal pressure adjusting member.
Description
Technical Field
The present specification discloses a technique related to a fuse for a high voltage fuse.
Background
In order to prevent overcurrent from flowing through high-voltage devices such as transformers, high-voltage fuses are disposed between distribution lines and the high-voltage devices. Patent document 1 discloses a high voltage fuse (cylindrical breaker) including: an upper electrode connected to the distribution line, a lower electrode connected to the wiring on the high-voltage device side, and a fuse for a high-voltage fuse disposed between the upper electrode and the lower electrode. The high voltage fuse of patent document 1 includes: the arc suppression device comprises a head metal part connected to an upper electrode, a lower connecting wire connected to a lower electrode, a fusible connecting wire connected between the head metal part and the lower connecting wire, and a cylindrical arc suppression tube surrounding the fusible connecting wire. The sealing space is formed by surrounding the support pin (sealing member) on the head metal piece side, the support pin (sealing member) on the lower connecting wire (connecting member connecting the lower connecting wire to the fusible connecting wire), and the arc suppression pipe, and the fusible connecting wire is located in the sealing space. When the fusible link is fused to generate an arc, the arc extinguishing pipe generates an arc extinguishing gas in the closed space to extinguish the arc. According to patent document 1, the arc suppression pipe is fixed to the head fitting by adhesion.
Patent literature
Patent document 1: japanese patent laid-open No. 2020-61334
As described above, the arc generated by the fusing of the fusible link is extinguished by the arc extinguishing gas generated in the closed space. In this case, when the pressure of the arc extinguishing gas in the closed space is insufficient, it is difficult to extinguish the arc. On the other hand, if the pressure of the arc extinguishing gas in the closed space is too high, the arc can be extinguished, but the arc extinguishing pipe may be broken by the pressure of the arc extinguishing gas, and the fuse tube housing the arc extinguishing pipe may be broken. As long as it is configured as: when the pressure of the arc extinguishing gas in the closed space reaches a predetermined value, the volume in the closed space increases, and the arc extinguishing pipe is separated from the head metal piece, so that the damage of the arc extinguishing pipe can be prevented. However, since the fuse for the high voltage fuse of patent document 1 fixes the arc suppression pipe to the head metal member by bonding, it is difficult to: the pressure of the arc extinguishing pipe separated from the head metal piece is set and controlled. The purpose of the present specification is to provide a novel high-voltage fuse that can control the pressure at which an arc suppression pipe is detached from a head metal member by setting.
Disclosure of Invention
The fuse for a high voltage fuse disclosed in the present specification is configured between an upper electrode and a lower electrode in a high voltage fuse having the upper electrode connected to a distribution line and the lower electrode connected to a wiring on a high voltage device side. The fuse for a high voltage fuse includes: the arc suppression device comprises a head metal piece connected to an upper electrode, a lower connecting wire connected to a lower electrode, a fusible connecting wire connected between the head metal piece and the lower connecting wire, and a cylindrical arc suppression tube surrounding the fusible connecting wire. The head metal piece has a head portion and a columnar portion. The top of the head is positioned outside the arc extinguishing pipe. The columnar portion extends from the head top toward the inside of the arc extinguishing pipe. According to the high-voltage fuse, the internal pressure adjusting member is fixed to the columnar portion in the arc suppression pipe. In addition, according to the high-voltage fuse, the arc suppression pipe is fixed to the head fitting by the internal pressure adjusting member.
Drawings
Fig. 1 shows a cross-sectional view of a high voltage fuse.
Fig. 2 shows a half sectional view of the fuse of embodiment 1.
Fig. 3 shows a cross-sectional view of the main construction of the fuse.
Fig. 4 shows a sectional view of the head metal part and the arc tube.
Fig. 5 is an enlarged sectional view showing a fixing portion of the head metal piece and the arc tube.
Fig. 6 is a plan view of an internal pressure adjusting member for fixing the head metal fitting and the arc tube.
Fig. 7 is a sectional view showing both of the states in which the arc suppression pipe is detached from the head metal fitting.
Fig. 8 is an enlarged cross-sectional view of the fixed portion of the two arc suppression pipes in a state of being detached from the head fitting.
Fig. 9 is a sectional view of a head metal part and an arc tube of the fuse of embodiment 2.
Fig. 10 is a sectional view of a head metal member and an arc tube of the fuse of embodiment 3.
Description of the reference numerals
12: fuse (fuse for high voltage fuse) 46: lower electrode
56: upper electrode 70: head metal piece
70a: top of head 70b: columnar portion
76: internal pressure adjusting member (gasket) 80: fusible link
85: arc extinction tube 85a: small diameter portion
85b: large diameter portion 92: lower connecting wire
100: high-voltage fuse
Detailed Description
(high-voltage fuse)
The high voltage fuse is connected between a distribution line and a high voltage device such as a transformer by an external wire. The high-voltage fuse includes: a cylindrical main body insulator made of porcelain, an upper electrode connected to the distribution line, a lower electrode connected to the wiring on the high voltage device side, and a fuse for a high voltage fuse arranged between the upper electrode and the lower electrode. The upper electrode, the lower electrode, and the fuse for the high-voltage fuse are disposed in the main body insulator. When an excessive current (a current equal to or higher than a predetermined value) flows through the high-voltage fuse (high-voltage fuse), a member (fusible link) of the high-voltage fuse blows, and a distribution line between the distribution line and the high-voltage device is disconnected. In addition, when the member of the high-voltage fuse blows, the distribution line and the device can be reconnected by replacing the high-voltage fuse.
(fuse for high-Voltage fuse)
A fuse for a high voltage fuse is provided with: the device comprises a head metal piece, a lower connecting wire, a fusible connecting wire and an arc suppression tube. The upper contact made of metal is fixed to the upper part of the fuse tube, and the lower contact made of metal is mounted on the lower part of the fuse tube. The fuse tube is formed by a cylindrical insulating material. Thereby, the upper contact and the lower contact are insulated by the fuse tube. The head metal piece, the lower connecting wire, the fusible connecting wire and the arc suppression tube are arranged in the fuse tube. The head metal is connected to the upper electrode by means of an upper contact. The lower connection line is connected to the lower electrode via a lower contact. The fusible link is surrounded by the arc suppression tube and connected between the head metal piece and the lower link. The head metal piece is not in direct communication with the lower connection line (upper contact and lower contact), but rather is in communication via a fusible connection line. The fusible link is formed of a low melting point metal. As a material of the fusible link, a tin monomer, an alloy mainly composed of tin (nickel-tin alloy, tin-silver alloy, copper-tin alloy, tin-silver-copper alloy, or the like) can be used. In addition, the fusible link is preferably formed of a metal that does not contain lead.
The head metal piece has: a head top part with external dimension larger than the inner diameter of the arc-extinguishing pipe, and a columnar part extending from the head top part into the arc-extinguishing pipe and having external diameter smaller than the inner diameter of the arc-extinguishing pipe. The columnar portion is inserted into the arc tube and fitted into the arc tube with play. That is, the arc extinguishing pipe is inserted into the columnar portion. When the columnar portion is inserted into the arc extinguishing pipe, the following posture is assumed: the head top is located outside the arc suppression pipe, and the columnar portion extends inside the arc suppression pipe. The head metal piece may also be configured to: the head portion and the columnar portion may be formed as a single body (inseparable member), or may be formed by fixing the head portion and the columnar portion, which are separate members. The shape of the head top is not particularly limited as long as it is not insertable into the arc tube, and may be, for example, circular, polygonal, or the like.
The arc extinguishing pipe may be formed by winding a wrapping paper or the like. By adjusting the number of windings of the wrapping paper, the inner diameter and the outer diameter of the arc tube can be adjusted. The arc extinguishing pipe comprises: a small diameter portion having an inner diameter smaller than that of the other portion, and a large diameter portion having an inner diameter larger than that of the small diameter portion. The small diameter portion is provided at the head top side end portion. The columnar portion of the head metal member extends to the large-diameter portion through the small-diameter portion. Further, a notch may be provided in an inner peripheral surface of the small diameter portion at a boundary portion between the small diameter portion and the large diameter portion of the arc suppression pipe. That is, the small diameter portion may be provided at the large diameter portion side end portion: the lacking part of the inner diameter of the small diameter part is substantially enlarged. The defect may be: the taper shape in which the shortage continuously increases (the substantial inner diameter increases) toward the large diameter portion may be a step shape (step) in which the shortage discontinuously increases. The arc extinguishing pipe (small diameter portion and large diameter portion) may be formed of one member. Alternatively, the small diameter portion may be formed by fixing a cylindrical body separate from the arc extinguishing pipe (large diameter portion) to the inner peripheral surface of the arc extinguishing pipe having a uniform inner diameter (i.e., arc extinguishing pipe having a large diameter portion from one end to the other end). By forming the arc tube using the cylinders of different diameters, the inner diameter of the arc tube can be easily changed (small diameter portion and large diameter portion are formed).
The arc suppression pipe is positioned (mounted) on the head fitting by the small diameter portion. Specifically, an annular internal pressure adjusting member is fixed to a columnar portion of the head metal fitting in the arc suppression pipe. The internal pressure adjusting member may be annular, and the external dimension is larger than the inner diameter of the small diameter portion and smaller than the inner diameter of the large diameter portion. In a state where the columnar portion of the head metal is inserted into the arc tube (a state where the columnar portion passes through the small diameter portion), the internal pressure adjusting member is press-fitted and fixed to the columnar portion. When the internal pressure adjusting member is fixed to the columnar portion, the small diameter portion is disposed between the head portion of the head metal and the internal pressure adjusting member. By fixing the internal pressure adjusting member to the columnar portion, the movement of the arc extinguishing pipe in the axial direction can be restricted by the head portion and the internal pressure adjusting member, and the arc extinguishing pipe can be positioned with respect to the head metal. That is, the arc suppression pipe is attached to the head metal fitting, not to the head metal fitting by bonding. The inner peripheral portion of the internal pressure adjusting member may be in contact with the entire periphery of the columnar portion, or may be in contact with a part of the columnar portion in the circumferential direction (e.g., intermittently in the circumferential direction).
When the internal pressure adjusting member is press-fitted and fixed to the columnar portion, the internal peripheral portion of the internal pressure adjusting member is deformed, and the internal pressure adjusting member is fixed to the columnar portion in a state in which the internal peripheral portion is bent in a direction away from the head top. When the inner peripheral portion of the inner pressure adjusting member is fixed to the columnar portion in a state where the inner peripheral portion is bent in a direction away from the head top portion, the position of the inner pressure adjusting member with respect to the columnar portion does not change even if the small diameter portion of the arc suppression pipe is in contact with the inner pressure adjusting member (even if the arc suppression pipe is intended to move in a direction away from the head top portion of the head metal member) in a normal state (a state where no overcurrent flows in the high-voltage fuse). That is, the arc suppression pipe is not separated from the head metal piece. The internal pressure adjusting member may be made of metal. When the metal internal pressure adjusting member is press-fitted and fixed to the columnar portion, the inner peripheral portion is easily deformed (plastically deformed), and the inner peripheral portion can be easily bent in a direction away from the head top portion. An example of the metal internal pressure adjusting member includes a metal gasket.
As will be described in detail later, in the high-voltage fuse disclosed in the present specification, when an overcurrent is applied to the high-voltage fuse, the arc suppression pipe may move downward relatively to the head metal. When the arc tube moves downward (actually, the arc tube moves away from the top of the head), the inner peripheral portion of the internal pressure adjusting member changes from a state of being bent in a direction away from the top of the head to a state of being bent: bending toward the top of the head. In particular, if the internal pressure adjusting member is a metal gasket, the direction in which the inner peripheral portion is bent is easily changed from the direction away from the head top portion to the direction toward the head top portion (plastic deformation). By adjusting the contact area of the inner peripheral portion of the inner pressure adjusting member with the columnar portion and/or the thickness of the inner pressure adjusting member, the force in which the direction in which the inner peripheral portion is bent starts to change can be adjusted. The inner peripheral portion of the internal pressure adjusting member may be provided with: a projection projecting toward the radial center. In this case, a plurality of protruding portions may be provided at equal intervals in the circumferential direction. By adjusting the number of the protruding portions and the gap between the protruding portions, the force with which the direction in which the inner peripheral portion is bent starts to change can be adjusted.
As described above, the fusible link is connected between the head metal piece and the lower link. That is, the fusible link is fixed to both the head metal piece and the lower link. Specifically, one end of the fusible link is directly fixed to the head metal piece, and the other end of the fusible link is fixed to the lower link by means of the fastening metal piece. In addition, in the fuse for the high voltage fuse, a tensile wire is fixed to the head metal member and the fastening metal member in addition to the fusible link. The tensile wire functions as a resistor. As the material for the tensile wire, stainless steel, silver alone, copper alloy (copper-nickel alloy, copper-nickel-chromium alloy) mainly composed of copper, or the like can be used. In a fuse for a high voltage fuse, a columnar portion of a head metal member is provided with: an upper sealing member for sealing the gap between the columnar portion and the arc suppression pipe, and a lower sealing member for sealing the gap between the fastening metal piece and the arc suppression pipe. As a result, the fusible link is disposed: the upper sealing member, the lower sealing member and the arc extinguishing pipe (large diameter portion) are arranged in a sealed space surrounded by the upper sealing member and the lower sealing member.
When overcurrent (current equal to or higher than a predetermined value) flows through the fusible link, the fusible link is blown, and the tensile wire is broken. When the fusible link is fused, arc extinguishing gas is generated from the inner surface of the arc extinguishing pipe due to heat generated during the fusing. The arc extinguishing gas generated from the arc extinguishing pipe fills the sealed space, and the pressure in the sealed space rises, so that the arc generated during fusing is extinguished. When the fusible link is fused, the lower sealing member moves downward due to a pressure rise in the sealed space, and protrudes from the lower end of the fuse tube together with the lower link.
When the pressure in the enclosed space excessively increases, a sharp increase in volume in the enclosed space is applied: and a force for moving the lower sealing member downward and also downward with respect to the arc suppression pipe. In the fuse for a high-voltage fuse disclosed in the present specification, when the pressure in the closed space rises to a predetermined value or more, the arc tube moves downward slightly with respect to the head metal, and the small diameter portion of the arc tube moves the internal pressure adjusting member downward. As a result, the force of the arc suppression pipe to move the internal pressure adjusting member downward is applied to the outer peripheral portion of the internal pressure adjusting member, and the inner peripheral portion of the internal pressure adjusting member is bent in the direction toward the head portion of the head metal. When the inner peripheral portion of the internal pressure adjusting member is bent in the direction of the head portion, the arc suppression pipe can move downward with respect to the head metal even with a relatively weak force (the pressure in the closed space is smaller than the predetermined value). The arc suppression pipe is easily moved downward with respect to the head metal, and the volume in the closed space increases in the initial stage, so that the pressure in the closed space decreases. That is, the internal pressure of the sealed space can be adjusted by the internal pressure adjusting member. When the pressure in the closed space moves the arc suppression pipe further downward with respect to the head metal member, the arc suppression pipe is separated from the head metal member, and the pressure in the closed space is equal to the pressure outside the closed space. That is, the sealed space is no longer sealed, and the pressure in the sealed space is reduced to be the same as the pressure in the fuse tube. As a result, the fuse tube is not broken. Further, the force (pressure) that changes the state of being bent downward (in the direction away from the head top) from the inner peripheral surface of the internal pressure adjusting member to the state of being bent upward (in the direction toward the head top) is known in advance through experiments.
As described above, the arc suppression pipe may be provided with a large diameter portion side end portion of the small diameter portion: a defect portion which substantially increases the inner diameter of the small diameter portion. If the small diameter portion is provided with a cutout portion, the bent portion can be positioned in the cutout portion when the inner peripheral portion of the internal pressure adjusting member is bent upward. That is, the curved portion of the internal pressure adjusting member can be prevented from contacting the arc extinguishing pipe (small diameter portion). By preventing the bent portion from contacting the arc suppression pipe, it is possible to suppress: the change of the orientation of the bent portion is hindered by the arc tube. When the pressure in the closed space exceeds a predetermined value, the orientation of the bent portion can be reliably changed, the volume in the closed space can be increased, the pressure in the closed space can be reliably reduced, and further, the arc suppression pipe can be reliably detached from the head metal piece.
[ example ]
(high-voltage fuse)
Referring to fig. 1, a high voltage fuse 100 is illustrated. The high voltage fuse 100 is provided on a distribution line and is used for protecting high voltage equipment such as a transformer. The high-voltage fuse 100 includes: the main body insulator 8 made of porcelain, the upper electrode 56 connected to the distribution wire side, the arc extinguishing rod 54 arranged inside the upper electrode 56, the lower electrode 46 connected to the equipment side, and the fuse 12 connecting the upper electrode 56 and the lower electrode 46. The main insulator 8 has a cylindrical shape, and a plurality of insulating skirts 14 are provided on the outer peripheral surface. Formed within the main body insulator 8 are: a 1 st cylindrical chamber 4, and a 2 nd cylindrical chamber 20 having a larger diameter than the 1 st chamber 4. A cylindrical arc extinguishing cylinder 6 is disposed in the 1 st chamber 4. The fuse 12 is disposed inside the arc extinguishing cylinder 6. The high voltage fuse 100 is provided with: in the gravity direction, the 1 st chamber 4 is the upper side, and the 2 nd chamber 20 is the lower side. The upper electrode 56 is disposed in the 1 st chamber 4, and the lower electrode 46 is disposed in the 2 nd chamber 20.
The cone-shaped upper die 2 is fixed to the upper portion of the main body insulator 8 by an adhesive. The leads of the upper die cone 2 are connected to distribution wires. The cone-shaped lower die cone 28 is fixed to the lower side wall 24 of the main body insulator 8 by an adhesive. The leads of the lower die 28 are connected to a transformer or the like.
The fuse 12 extends from chamber 1, 4, to chamber 2, 20, connecting the upper electrode 56 with the lower electrode 46. The fuse 12 includes: an insulating fuse tube 50, an upper contact 52 provided at an upper portion of the fuse tube 50, a lower contact 48 provided at a lower portion of the fuse tube 50, and a display tube 58 provided below the lower contact 48. The upper contact 52 is connected to the upper electrode 56 and the lower contact 48 is connected to the lower electrode 46. The cushioning member 18 is disposed between the lower contact 48 and the upper surface of the 2 nd chamber. The display tube 58 is fixed to the fuse tube 50. On the other hand, the lower contact 48 is movable in the up-down direction with respect to the fuse tube 50 and the display tube 58. The display tube 58 constitutes the lower end of the fuse 12.
As will be described in detail later, the fuse tube 50 accommodates therein: a head metal piece 70, a fusible link 80, and a lower link 90. The lower connecting wire 90 is taken out of the fuse tube 50 from the lower end of the display tube 58, folded upward at the lower end portion of the display tube 58, and tightly fixed to the fastening screw 60 attached to the lower contact 48. The spring 44 is disposed in a compressed state between the lower contact 48 and the display tube 58. Accordingly, the lower connection line 90 is applied with a tensile force. In other words, by tightly fixing the lower connecting wire 90 to the fastening screw 60, the spring 44 is compressed.
An opening 38 is provided at the lower end of the main insulator 8 (the lower end of the 2 nd chamber 20). The opening 38 is closed by the cover member 34. The cover member 34 is adhered to the inner wall 30 of the 2 nd chamber 20 by an adhesive 36. The cover member 34 is a bottomed cylinder, and includes: a shaft portion 34a, a flange portion 34b provided on the outer peripheral surface of the shaft portion 34a, and an opening/closing portion (bottom portion) 32 provided on the inner peripheral surface of the shaft portion 34 a. The flange portion 34b is provided at an intermediate portion in the up-down direction of the shaft portion 34a, protrudes outward in the radial direction, and surrounds the outer periphery 1 of the shaft portion 34 a. The opening/closing unit 32 is provided with: a position below the flange 34b and above the lower end of the shaft 34 a. Thus, the lower end of the shaft portion 34a is configured: a protrusion 34c protruding downward with respect to the opening/closing portion 32. The opening/closing portion 32 is protected by the projection 34c. The cover member 34 (including the opening/closing portion 32) is formed of an elastic material such as nonflammable rubber or soft synthetic resin.
The opening/closing portion 32 is provided with radial slits 32a. This makes it possible to easily pass the fuse 12 and the like through the opening/closing portion 32. That is, when the fuse 12 or the like passes through the opening/closing portion 32, the opening/closing portion 32 deforms, so that the opening/closing portion 32 is opened, and after the fuse 12 or the like passes through, the fuse returns to its original shape, and the opening/closing portion 32 is closed. As described above, since the opening/closing portion 32 (the lid member 34) is formed of an elastic material, the lid member 34 can be easily opened and closed by providing the slit 32a and deforming (elastically deforming).
According to the high voltage fuse 100, when a current equal to or greater than a predetermined value flows through the fuse 12, the fusible link 80 in the fuse 12 is blown. As a result, the spring 44 expands, and the fuse 12 (a member other than the lower contact 48) including the fuse tube 50 moves downward in a state where the lower contact 48 is connected to the lower electrode 46. After the fuse tube 50 (fuse 12) moves downward due to the elastic force and gravity of the spring 44, a step portion 50a formed in the fuse tube 50 contacts: a spring 45 (see fig. 2) disposed on the upper contact 52 side of the lower contact 48. The downward movement of the fuse tube 50 is buffered, and the movement of the fuse tube 50 is stopped. When the fuse 12 moves downward, the display tube 58 is exposed from the cover member 34 (the opening/closing portion 32) to the lower portion of the high-voltage fuse 100. That is, by checking whether the display tube 58 is exposed to the lower portion of the high-voltage fuse 100, it is possible to determine whether the fusible link 80 is blown (whether the fuse 12 needs to be replaced). In addition, even if the fusible link 80 is blown, the lower contact 48 continues to be connected (fixed) to the lower electrode 46. This prevents the fuse 12 (the display tube 58) from falling from the high-voltage fuse 100.
(fuse: example 1)
Referring to fig. 2-6, fuse 12 is illustrated. As shown in fig. 2, the upper contact 52 is fixed to the upper portion of the fuse cartridge 50. The upper contact 52 is screwed to the fuse tube 50. A concave-convex surface 52a is formed on a part of the surface of the upper contact 52. By providing the concave-convex surface 52a, the sliding of the upper contact 52 can be suppressed when the upper contact 52 is screwed into the fuse tube 50, and the upper contact 52 can be reliably fixed to the fuse tube 50. The lower portion of the fuse cartridge 50 extends into the lower contact 48. An arc extinguishing pipe 85 is disposed in the fuse tube 50. A head top 70a of the head metal 70 is provided at the upper end of the arc tube 85 and outside the arc tube 85. The overhead portion 70a is in contact with the upper contact 52. That is, the head metal 70 is connected to the upper electrode 56 via the upper contact 52 (see fig. 1).
The lower connection line 90 is exposed to the outside of the arc tube 85 from the lower end of the arc tube 85, and is exposed to the outside of the fuse 12 from the lower end of the display tube 58. A connection terminal 90a is fixed to an end of the lower connection wire 90, and the connection terminal 90a is fixed to the fastening screw 60 (lower contact 48). That is, the lower connection line 90 is connected to the lower electrode 46 via the lower contact 48 (see fig. 1).
Fig. 3 shows the internal structure of the arc suppression pipe 85. As shown in fig. 3, the head metal 70 includes a head portion 70a and a columnar portion 70b. The head portion 70a is provided at one end (upper end) of the columnar portion 70b. In other words, the columnar portion 70b extends from the head portion 70a toward one direction. The head top 70a has a disk shape, and an outer diameter thereof is larger than an outer diameter of the arc extinguishing pipe 85. Since the outer diameter of the head top 70a is larger than the inner diameter of the arc tube 85, the head top 70a is located outside the arc tube 85 on the upper side of the arc tube 85. The columnar portion 70b extends from the head top portion 70a downward in the arc suppression pipe 85. The upper sealing member 74 is adhesively fixed to the lower end of the columnar portion 70b. The upper sealing member 74 may be fitted to the columnar portion 70b so as to cover the lower end of the columnar portion 70b, so that the upper sealing member 74 and the columnar portion 70b are fixed. The upper seal member 74 has a disk shape, and an outer peripheral surface thereof contacts an inner peripheral surface of the arc extinguishing pipe 85. The upper sealing member 74 seals the gap between the columnar portion 70b and the arc suppression pipe 85.
Fusible link 80 and tensile wire 82 are secured to the lower portion of columnar portion 70b. Thus, the fusible link 80 and the tensile wire 82 are surrounded laterally by the arc suppression pipe 85. In addition, fusible link 80 and tensile wire 82 are also secured to fastening hardware 92. In other words, one end of fusible link 80 and tensile wire 82 is fixed to columnar portion 70b (head metal member 70), and the other end is fixed to fastening metal member 92. Also secured to the fastening hardware 92 is: a lower connecting wire 90 having a connecting terminal 90 a. Fusible link 80 and tensile wire 82 are connected to both pillar portion 70b (head metal piece 70) and lower link 90 by means of fastening metal piece 92.
A lower sealing member 94 is adhesively secured to the upper end of the fastening metal 92. The lower seal member 94 has a disk shape, and its outer peripheral surface contacts the inner peripheral surface of the arc tube 85. The lower sealing member 94 seals the gap between the fastening metal 92 and the arc suppression pipe 85. In the up-down direction, the lower sealing member 94 is provided at a position apart from the upper sealing member 74. Thus, fusible link 80 and tensile wire 82 are present in: the upper seal member 74, the lower seal member 94, and the arc extinguishing pipe 85 surround the closed space 84.
Further, a spring washer 72 is attached to the upper end (outer periphery of the upper end portion) of the arc extinguishing pipe 85. The spring washer 72 is an example of a washer (internal pressure adjusting member) made of metal. The spring washer 72 is fitted into a recess (not shown) provided in the outer peripheral surface of the upper end portion of the arc tube 85, and is positioned with respect to the arc tube 85. The spring washer 72 is in contact with the lower surface of the crown 70a of the head metal piece 70. Therefore, as shown in fig. 2, when the arc suppression pipe 85 is attached to the fuse tube 50, the spring washer 72 presses the head portion 70a against the upper contact 52, and the head portion 70a and the upper contact 52 are reliably conducted, so that the upper electrode 56 and the lower electrode 46 are reliably conducted (see fig. 1).
Fig. 4 shows an enlarged view of the upper end portion of the arc suppression pipe 85. As shown in fig. 4, the arc suppression pipe 85 includes a small diameter portion 85a and a large diameter portion 85b. The small diameter portion 85a is provided at an end portion (upper end portion) on the head top portion 70a side. The inner diameter of the small diameter portion 85a is smaller from one end to the other end of the arc extinguishing pipe 85 than the other portion (see fig. 3). In the arc extinguishing pipe 85, a portion other than the small diameter portion 85a is formed as: all inner diameters are equal (inner diameter is larger than the small diameter portion 85 a). That is, in the arc suppression pipe 85, the portions other than the small diameter portion 85a are the large diameter portion 85b. The columnar portion 70b of the head metal 70 is inserted from the upper end of the small diameter portion 85a of the arc suppression pipe 85, and the gasket 76 is press-fitted and fixed to the columnar portion 70b at the step portion of the boundary portion between the small diameter portion 85a and the large diameter portion 85b. Further, since the columnar portion 70b is inserted through the small diameter portion 85a and the gasket 76 is fixed to the columnar portion 70b, the arc extinguishing pipe 85 is rotatable with respect to the head metal fitting 70. The outer peripheral surface of the columnar portion 70b and the inner peripheral surface of the small diameter portion 85a may be fixed by adhesion or the like. The gasket 76 is annular and has a circular outer periphery. The outer diameter of washer 76 is greater than the inner diameter of small diameter portion 85a, but less than the inner diameter of large diameter portion 85b. Therefore, the surface (upper surface) of the washer 76 is opposed to the surface (lower surface) of the small diameter portion 85a.
As described above, the head top 70a is located outside the arc tube 85 (outside the small diameter portion 85 a) on the upper side of the arc tube 85. The upper surface of the washer 76 faces the lower surface of the small diameter portion 85a. More specifically, the upper surface of the washer 76 contacts the lower surface of the small diameter portion 85a. Therefore, the small diameter portion 85a is disposed between the head portion 70a and the gasket 76 in the up-down direction. The arc suppression pipe 85 is positioned (fixed) to the head metal 70 by the small diameter portion 85a being disposed between the head portion 70a and the gasket 76.
Fig. 5 shows an enlarged view of the boundary portion between the small diameter portion 85a and the large diameter portion 85b. As shown in fig. 5, a cutout 85c is formed at a boundary portion between the small diameter portion 85a and the large diameter portion 85b, and at a corner portion (a corner between the inner peripheral surface and the lower surface) of the small diameter portion 85a. The missing portion 85c surrounds 1 week in the circumferential direction of the small diameter portion 85a, and the missing amount continuously increases as it goes toward the large diameter portion 85b side (lower portion side). In other words, the tapered lacking portion 85c is provided at the lower end of the small diameter portion 85a so as to surround 1 circumference. The lacking portion 85c is formed as: even if the inner peripheral portion 76a of the grommet 76, which will be described later, is bent upward, the inner peripheral portion 76a does not come into contact with the cutout portion 85c.
The inner peripheral portion 76a of the washer 76 is bent downward (in a direction away from the top portion 70 a). As described above, the washer 76 is press-fitted and fixed to the columnar portion 70b. Specifically, the washer 76 is pushed in upward (toward the crown portion 70 a) from the lower end of the columnar portion 70b. Thereby, the inner peripheral portion 76a of the washer 76 is bent downward due to friction with the columnar portion 70b. By bending the inner peripheral portion 76a downward, the small diameter portion 85a can be reliably supported, and the position of the arc suppression pipe 85 with respect to the head metal fitting 70 can be suppressed from being changed. That is, the arc suppression pipe 85 is firmly fixed to the head metal 70.
As shown in fig. 6, an inner peripheral portion 76a of the gasket 76 is provided with: a plurality of protruding portions 78 protruding toward the center 76 c. The protrusions 78 are provided at equal intervals in the circumferential direction of the gasket 76. When the washer 76 is press-fitted and fixed to the columnar portion 70b, all the protruding portions 78 are bent downward.
Referring to fig. 7 and 8, the advantages of fuse 12 are described. As described above, when a current of a predetermined value or more flows through the fuse 12, the fusible link 80 is blown. When the fusible link 80 is fused, an arc extinguishing gas is generated from the inner surface of the arc extinguishing pipe 85, and the sealed space 84 is filled with the arc extinguishing gas, so that an arc generated during the fusing is extinguished. When the closed space 84 is filled with the arc extinguishing gas, the pressure in the closed space 84 rises. As described above, since the inner peripheral portion 76a of the gasket 76 is bent downward, the head metal 70 and the arc extinguishing pipe 85 are firmly fixed. Thus, even if the pressure in the closed space 84 increases to a predetermined pressure, the position of the arc suppression pipe 85 with respect to the head metal fitting 70 does not change. Since the volume in the sealed space 84 does not change, the pressure in the sealed space 84 is liable to rise, and the arc generated at the time of fusing can be reliably extinguished.
When the pressure in the closed space 84 increases excessively (equal to or higher than a predetermined pressure), the volume in the closed space 84 increases, and the arc suppression pipe 85 moves downward with respect to the head metal fitting 70 (fig. 7). When the arc extinguishing pipe 85 moves downward, the lower surface of the small diameter portion 85a contacts the gasket 76, and therefore, the gasket 76 moves downward. At this time, a force of downward movement of the arc extinguishing pipe 85 is applied to the outer peripheral portion of the gasket 76, and the outer peripheral portion of the gasket 76 is pressed downward. Accordingly, the inner peripheral portion 76a of the washer 76 changes from a state of being bent downward (fig. 5) to a state of being bent upward (fig. 8). Even with a relatively weak pressure (a pressure smaller than a predetermined pressure), the inner peripheral portion 76a of the gasket 76 can move the gasket 76 downward in a state of being bent upward. That is, when the pressure in the closed space 84 rises to a predetermined pressure or higher and the inner peripheral portion 76a of the gasket 76 is bent upward, the arc suppression pipe 85 is likely to move downward. When the arc extinguishing pipe 85 moves downward under the relatively weak pressure, the volume in the closed space 84 increases initially, and the pressure in the closed space 84 can be reduced. When the pressure in the closed space 84 moves the arc tube 85 further downward with respect to the head metal 70, the arc tube 85 is separated from the head metal 70, and the pressure in the closed space 84 is the same as the pressure outside the closed space 84 (outside the arc tube 85). That is, the sealed space 84 is no longer sealed, and the pressure in the sealed space 84 drops to the same pressure as the pressure in the fuse tube 50 (see fig. 2). The pressure in the sealed space 84 can be suppressed from further rising beyond a predetermined pressure, and the fuse tube 50 is not broken.
Since the fuse 12 is a phenomenon in which the direction in which the inner peripheral portion 76a of the gasket 76 is bent is changed, and when an overcurrent flows through the fuse 12, the arc tube 85 is easily moved downward, the volume in the closed space 84 can be increased in the initial stage, and the pressure in the closed space 84 can be reduced. Further, since the small diameter portion 85a is formed with the cutout portion 85c, the inner peripheral portion 76a of the gasket 76 is not in contact with the small diameter portion 85a. By providing the small diameter portion 85a with the lacking portion 85c, it is possible to suppress the upward bending of the inner peripheral portion 76a from being hindered.
(example 2)
Referring to fig. 9, the fuse 112 is illustrated. The fuse 112 is a modification of the fuse 12, and the arc extinguishing pipe 185 has a structure different from that of the first embodiment: the arc extinguishing pipe 85 used for the fuse 12 is structured. The same reference numerals as those given to the fuse 12 are given to the same components as the fuse 12, and the description thereof is omitted.
The arc extinguishing pipe 185 includes a small diameter portion 185a and a large diameter portion 185b. The small diameter portion 185a is provided at an end portion of the crown portion 70a side. The small diameter portion 185a is formed by inserting and fixing a metal cylinder 186 at an end (upper end) of the large diameter portion 185b. That is, the arc suppression pipe 185 is formed by a 1 st cylindrical body (large diameter portion 185 b) having a constant inner diameter from one end to the other end, and a 2 nd cylindrical body (cylindrical body 186) having a length in the axial direction shorter than that of the 1 st cylindrical body and a diameter smaller than that of the 1 st cylindrical body. Specifically, the columnar portion 70b of the head metal 70 is inserted from the upper end of the cylinder 186, and the washer 76 is press-fitted and fixed to the columnar portion 70b. The cylindrical portion 70b of the head metal 70 and the cylindrical body 186 are inserted from the upper end of the large diameter portion 185b of the arc extinguishing pipe 185, and the outer peripheral surface of the cylindrical body 186 and the inner peripheral surface of the upper end side of the large diameter portion 185b are bonded and fixed. Even in the fuse 112, the columnar portion 70b is inserted into the cylinder 186, and the gasket 76 is fixed to the columnar portion 70b, so that the arc extinguishing pipe 185 can rotate with respect to the head metal 70. The outer peripheral surface of the columnar portion 70b and the inner peripheral surface of the tubular body 186 may be fixed by adhesion or the like.
(example 3)
Referring to fig. 10, the fuse 212 is illustrated. Fuse 212 is a modification of fuses 12 and 112, and arc tube 285 has a shape different from that of the other: the shape of the arc tube 85, 185 used in the fuse 12, 112. The fuse 212 is assigned the same reference numerals as those assigned to the fuses 12 and 112, and the description thereof is omitted.
Arc extinguishing pipe 285 includes small diameter portion 285a and large diameter portion 285b. The small diameter portion 285a is provided at the end of the crown portion 70a side. The small diameter portion 285a is formed by inserting and fixing a metal cylindrical body 186 at an end (upper end) of the large diameter portion 285b. That is, the arc extinguishing pipe 285 is formed by the 1 st cylindrical body (large diameter portion 285 b) and the 2 nd cylindrical body (cylindrical body 186) having a smaller axial length than the 1 st cylindrical body and a smaller diameter than the 1 st cylindrical body. Further, a tapered inclined portion 285c is provided on the inner side surface of the upper portion side (the crown portion 70a side) of the large diameter portion 285b so as to surround 1 circumference. The inclined portion 285c is adjusted to a length of 1/2 to 2/3 of the length of the tubular body 186. The inner diameter (maximum diameter) of the inclined portion 285c is formed so as to be 1.1 to 1.2 times the inner diameter of the large diameter portion 285b of the portion where the inclined portion 285c is not provided, so that the inner diameter of the inclined portion 285c tends to increase toward the crown portion 70a of the head metal member 70. Accordingly, a tapered inclined portion 285c is provided on the inner peripheral surface of the large-diameter portion 285b at a part (the crown 70a side) of the outer peripheral surface of the tubular body 186 facing the inner surface of the large-diameter portion 285b.
In the arc extinguishing pipe 285, the columnar portion 70b of the head metal 70 is inserted from the upper end of the tubular body 186, and the gasket 76 is press-fitted and fixed to the columnar portion 70b. The cylindrical portion 70b of the head metal 70 and the cylindrical body 186 are inserted from the upper end of the large-diameter portion 285b of the arc extinguishing pipe 285, and the outer peripheral surface of the cylindrical body 186 and the inner peripheral surface of the large-diameter portion 285b (including the inner peripheral surface of the inclined portion 285 c) are bonded and fixed. In addition, when the lower end of the tubular body 186 is inserted from the upper end of the large-diameter portion 285b, the inclined portion 285c prevents the adhesive from being scraped off, contributing to the reinforcement of the adhesive force between the tubular body 186 and the large-diameter portion 285b.
Although specific examples of the present invention have been described in detail above, these are merely illustrative, and do not limit the claims. The technology described in the claims includes various modifications and changes to the specific examples described above. The technical elements described in the present specification and the drawings can be used singly or in various combinations to achieve technical usefulness, and are not limited to the combinations described in the claims at the time of application. The technology illustrated in the present specification or the drawings can achieve a plurality of objects at the same time, and one of them is useful in technical aspects.
Claims (5)
1. A fuse for a high voltage fuse, which is provided between an upper electrode and a lower electrode in a high voltage fuse having the upper electrode connected to a distribution line and the lower electrode connected to a wiring on a high voltage device side,
the fuse for a high voltage fuse includes: a head metal member connected to the upper electrode and having a head portion and a columnar portion, a lower connecting wire connected to the lower electrode, a fusible connecting wire connected between the head metal member and the lower connecting wire, and a cylindrical arc suppression tube surrounding the fusible connecting wire,
the top part of the head is positioned outside the arc extinguishing pipe,
the columnar part extends from the top of the head towards the inside of the arc extinguishing pipe,
an internal pressure adjusting member is fixed to a columnar portion in the arc extinguishing pipe,
the arc extinguishing pipe comprises: a small diameter portion through which the columnar portion is inserted and which is located at the head top side end portion of the columnar portion, and a large diameter portion having an inner diameter larger than that of the small diameter portion,
the internal pressure adjusting member is an annular gasket having an external dimension larger than the inner diameter of the small diameter portion and smaller than the inner diameter of the large diameter portion,
the internal pressure adjusting member is fixed to the columnar portion in the large diameter portion in a state in which the inner peripheral portion is bent in a direction away from the head top portion,
the arc suppression pipe is fixed to the head fitting by the internal pressure adjusting member.
2. A fuse for a high voltage fuse according to claim 1, wherein,
a notch is provided on the inner peripheral surface of the small diameter portion at the boundary portion between the small diameter portion and the large diameter portion of the arc extinguishing pipe.
3. A fuse for a high voltage fuse according to claim 1 or 2, wherein,
the internal pressure adjusting member is made of metal.
4. A fuse for a high voltage fuse according to claim 1, wherein,
the small diameter portion is formed by fixing the cylindrical body of the large diameter portion body to the inner peripheral surface of the large diameter portion.
5. A fuse for a high voltage fuse as claimed in claim 4, wherein,
the outer peripheral surface of the cylinder body is provided with an inclined portion at a portion facing the inner peripheral surface of the large-diameter portion.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-190326 | 2020-11-16 | ||
| JP2020190326 | 2020-11-16 | ||
| JP2021031931A JP7383658B2 (en) | 2020-11-16 | 2021-03-01 | Fuse for high pressure blower |
| JP2021-031931 | 2021-03-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114512377A CN114512377A (en) | 2022-05-17 |
| CN114512377B true CN114512377B (en) | 2024-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110319932.2A Active CN114512377B (en) | 2020-11-16 | 2021-03-25 | Fuse for high voltage fuse |
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| CN (1) | CN114512377B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB442709A (en) * | 1933-05-13 | 1936-02-10 | Schweitzer & Conrad Inc | Improvements in or relating to the quenching of arcs |
| JPS5727530A (en) * | 1980-07-25 | 1982-02-13 | Kansai Electric Power Co | High voltage cutout fuse |
| CN2919510Y (en) * | 2006-04-27 | 2007-07-04 | 连喜军 | High voltage drop-out type fuse with zero damping |
| TWM324273U (en) * | 2007-05-09 | 2007-12-21 | Energy Support Corp | High voltage fusing apparatus |
| CN201226331Y (en) * | 2008-04-11 | 2009-04-22 | 上海电力带电作业技术开发有限公司 | Pagoda type insulation fuse |
| CN101635233A (en) * | 2008-07-24 | 2010-01-27 | 上海市电力公司 | Insulating enclosed type pagoda-shaped fuse |
| JP2014167874A (en) * | 2013-02-28 | 2014-09-11 | Energy Support Corp | Cylindrical cutout |
| JP2020061334A (en) * | 2018-10-12 | 2020-04-16 | エナジーサポート株式会社 | Fuse for high pressure cutter |
-
2021
- 2021-03-25 CN CN202110319932.2A patent/CN114512377B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB442709A (en) * | 1933-05-13 | 1936-02-10 | Schweitzer & Conrad Inc | Improvements in or relating to the quenching of arcs |
| US2091424A (en) * | 1933-05-13 | 1937-08-31 | Schweitzer & Conrad Inc | Fuse |
| JPS5727530A (en) * | 1980-07-25 | 1982-02-13 | Kansai Electric Power Co | High voltage cutout fuse |
| CN2919510Y (en) * | 2006-04-27 | 2007-07-04 | 连喜军 | High voltage drop-out type fuse with zero damping |
| TWM324273U (en) * | 2007-05-09 | 2007-12-21 | Energy Support Corp | High voltage fusing apparatus |
| CN201226331Y (en) * | 2008-04-11 | 2009-04-22 | 上海电力带电作业技术开发有限公司 | Pagoda type insulation fuse |
| CN101635233A (en) * | 2008-07-24 | 2010-01-27 | 上海市电力公司 | Insulating enclosed type pagoda-shaped fuse |
| JP2014167874A (en) * | 2013-02-28 | 2014-09-11 | Energy Support Corp | Cylindrical cutout |
| JP2020061334A (en) * | 2018-10-12 | 2020-04-16 | エナジーサポート株式会社 | Fuse for high pressure cutter |
| CN111048371A (en) * | 2018-10-12 | 2020-04-21 | 日本能源服务株式会社 | Fuse for high-voltage fuse |
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|---|---|
| CN114512377A (en) | 2022-05-17 |
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