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CN-121983479-A - High-voltage fuse for photovoltaic system

CN121983479ACN 121983479 ACN121983479 ACN 121983479ACN-121983479-A

Abstract

The invention relates to the technical field of fuses and discloses a high-voltage fuse for a photovoltaic system, which comprises a shell and a fuse tube arranged in the shell, wherein the fuse tube comprises a tube body and a fuse wire arranged in the tube body, arc extinguishing mediums are filled in the tube body, a plurality of guide protrusions distributed around the circumference of a central shaft of the tube body are arranged on the tube body, each guide protrusion comprises an inner protrusion arranged in the tube body and an outer protrusion arranged outside the tube body, the outer protrusions and the inner protrusions are in one-to-one correspondence and synchronously extend, the inner protrusions divide the space in the tube body into a plurality of chambers, the arc extinguishing mediums are filled in the plurality of chambers, the inner protrusions are used for dividing the arc extinguishing mediums, and the outer protrusions serve as auxiliary positioning structures of the tube body and the shell.

Inventors

  • YU PEIGEN
  • FAN YOUJUN
  • LIN SHIMING
  • ZOU JIANPING
  • SUN XUKE
  • HUANG WEI

Assignees

  • 火炬电气集团有限公司

Dates

Publication Date
20260505
Application Date
20260306

Claims (10)

  1. 1. The utility model provides a high voltage fuse for photovoltaic system, includes casing (1) and sets up fusion tube (3) in casing (1), fusion tube (3) include body (31) and set up fuse (33) in body (31), body (31) intussuseption is filled with arc extinguishing medium (311), its characterized in that: Be provided with on body (31) around the center pin circumference distribution of body (31) a plurality of direction protruding (35), each direction protruding (35) including be located the inside interior arch (352) of body (31) and be located the outside outer arch (351) of body (31), outer arch (351) and interior protruding (352) one-to-one, synchronous extension, interior protruding (352) is divided into a plurality of cavities with body (31) inner space, arc extinguishing medium (311) are filled in a plurality of cavities, interior protruding (352) are used for separating arc extinguishing medium (311), outer protruding (351) are as the auxiliary positioning structure of body (31) and casing (1).
  2. 2. A high voltage fuse for a photovoltaic system as claimed in claim 1, characterized in that each guiding projection (35) is of unitary construction with the tube body (31).
  3. 3. A high voltage fuse for a photovoltaic system as claimed in claim 1, characterized in that each guide projection (35) and tube (31) are of a split type structure.
  4. 4. A high voltage fuse for a photovoltaic system according to any of claims 2 or 3, characterized in that the guide protrusions (35) are internally provided with exhaust channels (353), the channel inlets (3531) of the exhaust channels (353) are arranged on the inner protrusions (352) at positions close to the fuse wires (33), the channel outlets (3532) of the exhaust channels (353) are arranged outside the outer protrusions (351), the guide sleeves (4) are arranged in the shell (1), the guide sleeves (4) are wrapped outside the channel outlets (3532), each guide protrusion (35) is internally provided with one exhaust channel (353) correspondingly, the number of the exhaust channels (353) is consistent with that of the guide protrusions (35) to form an exhaust system which is uniformly distributed, and the exhaust channels extend all the way through the outer protrusions (351) and the inner protrusions (352) to form a complete exhaust path with the inner cavity of the tube body (31) and the guide sleeves (4).
  5. 5. The high voltage fuse for a photovoltaic system according to claim 4, wherein the exhaust channel (353) is configured in a horn shape, and adopts a gradual change structure with an inner width and an outer width, the exhaust channel (353) is wider at a position closer to the channel inlet (3531), the width is narrower at a position closer to the channel outlet (3532), the channel inlet (3531) is expanded, and the channel outlet (3532) is contracted.
  6. 6. A high voltage fuse for a photovoltaic system according to claim 5, characterized in that said guiding sleeve (4) comprises two independent half-rings, each fixedly mounted on two housings (1).
  7. 7. The high-voltage fuse for a photovoltaic system according to claim 6, wherein a positioning block (41) for a pair of symmetrical pairs is provided on the inner wall of the guide sleeve (4) corresponding to each outer protrusion (351), and the positioning block (41) is used for supporting the outer protrusions (351) to realize a positioning function.
  8. 8. A high voltage fuse for a photovoltaic system as claimed in claim 3 wherein said guide projection (35) has a triangular shape with a wide inside and a narrow outside.
  9. 9. A high voltage fuse for a photovoltaic system as claimed in claim 7, characterized in that the innermost ends of the respective channel inlets (3531) are located on the same elliptical arc, and that the respective guiding protrusions (35) are circumferentially uniformly distributed within the tube body (31).
  10. 10. A high voltage fuse for a photovoltaic system according to any one of claims 1, characterized in that the two ends of the fusion tube (3) are provided with end caps (32), the end caps (32) are wrapped at the two ends of the tube body (31), the end caps (32) at the two ends are respectively fixedly provided with a wiring terminal (34) through screws, the fuse (33) is electrically connected with the end caps (32) and the wiring terminal (34), the wiring terminal (34) at the two ends is electrically connected with the wiring terminal (2) through screws, and the wiring terminal (2) is fixedly arranged in the shell (1).

Description

High-voltage fuse for photovoltaic system Technical Field The invention relates to the technical field of fuses, in particular to a high-voltage fuse for a photovoltaic system. Background At present, the capacity of a photovoltaic installation is continuously expanded, a high-voltage fuse is used as a key protection device of a direct current side of a photovoltaic system, and the high-voltage fuse is widely applied to links such as a photovoltaic string, a combiner box and an inverter. Unlike conventional ac fuses, the high voltage fuse for photovoltaic systems needs to operate for a long period of time under high dc voltage and complex outdoor environments (high temperature, high humidity, and strong vibration), and has higher requirements on structural stability, arc extinguishing performance, and mechanical strength. At present, the core structure of the existing photovoltaic system high-voltage fuse generally comprises a shell, a fusion tube, a fuse and an arc extinguishing medium, wherein the fusion tube is a core component for bearing the fuse and the arc extinguishing medium, and the arc extinguishing medium (mostly high-purity quartz sand and the like) is filled in the fusion tube and is used for absorbing arc energy and cooling an arc when the fuse is fused, so that reliable arc extinguishing is realized, and equipment damage or safety accidents caused by arc reburning are avoided. However, the existing fusion tube structural design has a plurality of defects, is difficult to meet the use requirement of a photovoltaic system under a high-voltage working condition, and mainly has the following technical problems: Firstly, the fusion pipe body is of a smooth cylindrical structure, and the bending strength of the fusion pipe body is insufficient. In the outdoor installation and transportation process of the photovoltaic power station, the fusion tube is easy to be influenced by external force impact or vibration, deformation, cracking and the like are caused, and meanwhile, when the fuse wire is fused to generate high-temperature electric arc, larger arc extinguishing gas pressure and electric power can be generated in the tube body, so that the damage of the tube body is further aggravated, and even the burst of the fusion tube is caused, and the normal work and the service life of the fuse are influenced. Secondly, arc extinguishing medium in the melting pipe is mostly in an integral filling mode, and no effective separation structure exists. In the transportation, installation or long-term operation process of the fuse, the arc extinguishing medium is easily layered and slides under the influence of factors such as vibration, inclination and the like, so that the arc extinguishing medium is unevenly distributed in the tube body. The contact area of the arc extinguishing medium and the inner wall of the pipe body can be reduced, the conduction efficiency of arc heat is affected, the arc extinguishing performance is unstable, when a circuit fails, the arc cannot be extinguished rapidly and reliably, the fault is possibly enlarged, and the safe operation of a photovoltaic system is affected. Thirdly, the positioning structure design of the fusion pipe and the shell is imperfect. The existing fusion pipe and the shell are positioned only through the end structures at the two ends, and an effective auxiliary positioning mechanism is lacked, so that the connection stability of the fusion pipe and the shell is poor. Under the working conditions of outdoor strong wind, equipment vibration and the like, the fusion tube is easy to deviate and loosen in the shell, so that the contact reliability of the fuse wire and the circuit contact is affected, the abrasion of the tube body is possibly aggravated due to the vibration of the fusion tube, the service life of the fuse is further shortened, and even potential safety hazards are caused. In summary, aiming at the technical problems of insufficient bending strength of a fusion tube, easiness in layered sliding of an arc extinguishing medium, poor connection stability of the fusion tube and a shell and the like in the conventional high-voltage fuse of the photovoltaic system, a high-voltage fuse with optimized structure is needed to improve the operation reliability and service life of the high-voltage fuse and meet the protection requirements of the photovoltaic system under high-voltage and complex working conditions. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides the high-voltage fuse for the photovoltaic system, which can improve the bending strength of a pipe body, separate arc extinguishing mediums to avoid layered sliding, increase the contact area and accelerate arc heat dissipation by arranging the guiding bulges distributed circumferentially on the pipe body of the melting pipe, and improve the connection stability of the melting pipe and a shell by assisting in positioning th