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CN-122025486-A - Outdoor high-voltage current-limiting fuse

CN122025486ACN 122025486 ACN122025486 ACN 122025486ACN-122025486-A

Abstract

The invention belongs to the technical field of fuses, in particular to an outdoor high-voltage current-limiting fuse which comprises an epoxy tube; an upper locking ring and a lower locking ring are respectively sleeved at the upper end and the lower end of the epoxy pipe, a static contact piece is arranged on the upper locking ring and is arranged under the anti-icing cover through a bolt, and a first spring is arranged on the static contact piece; meanwhile, the connecting piece at the lower end is internally provided with a connecting cavity and a plug structure, and is matched with a connecting wire in a rotating seat, so that stable electric extraction is realized, and the design of a rotatable connecting frame allows the fuse to flexibly adjust the installation angle on site according to the wire inlet and outlet direction, thereby greatly facilitating construction and maintenance in an outdoor complex environment.

Inventors

  • SU WU
  • WANG JUN
  • CHEN CONGLI

Assignees

  • 陕西苏源瑞能新能源科技有限公司
  • 西安苏源电器有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (6)

  1. 1. An outdoor high-voltage current-limiting fuse comprises an epoxy pipe (9), and is characterized in that an upper locking ring (8) and a lower locking ring (10) are sleeved at the upper end and the lower end of the epoxy pipe (9) respectively, a rotating seat (24) is hinged to the side face of the lower locking ring (10), the rotating seat (24) is rotatably connected in a connecting frame (29), a lower outer cap (12) is arranged at the bottom end of the epoxy pipe (9), an upper outer cap (11) is arranged at the top end of the epoxy pipe (9), a first connecting sleeve (13) is arranged below the upper outer cap (11), a second connecting sleeve (14) is arranged on the lower outer cap (12), a melt (15) is connected between the first connecting sleeve (13) and the second connecting sleeve (14), a strut (16) is arranged between the first connecting sleeve (13) and the second connecting sleeve (14), a striker (17) is arranged in the strut (16), a connecting piece (19) is arranged in the lower locking ring (10), a connecting piece (19) is arranged in the connecting cavity (20), a connecting wire (21) is arranged in the connecting cavity (20), and a connecting plug-in joint (22) is arranged between the first connecting sleeve (14); The impactor (17) comprises a guide sleeve (171) arranged in a strut (16), wherein the guide sleeve (171) is of a cylindrical structure with an opening at the bottom end, the guide sleeve (171) is communicated with a connecting cavity (20) through a lower outer cap (12) in an opening at the bottom end, a limiting ring (172) is arranged in the guide sleeve (171), a firing pin (173) is arranged on the inner wall of the limiting ring (172), the firing pin (173) is of a cylindrical structure with an opening at the top end, huang Tongdian (175) is arranged in the firing pin (173), a second spring (174) is arranged on the brass pad (175), the top end of the second spring (174) is fixedly connected with the inner top wall of the guide sleeve (171), a connecting insulation sleeve (178) is arranged on the guide sleeve (171), a fuse wire (176) is arranged on the brass pad (175), the top end of the fuse wire (176) passes through the connecting insulation sleeve (178) and is connected with a copper tube (177), the copper tube (177) is arranged on the connecting insulation sleeve (178), the top end of the copper tube (177) is provided with a second spring (174), the top end of the copper tube (175) is fixedly connected with the copper tube (179), and the fuse wire (179) is arranged outside the copper tube (11); A connecting pin (25) is arranged in the rotating seat (24), a rotating guide frame (26) is connected to the outer side of the connecting pin (25) in a rotating way, the rotating guide frame (26) is abutted against the connecting wire (22), a limit stop block (28) is arranged on the right side surface of the rotating guide frame (26), and the limit stop block (28) is arranged in the rotating seat (24); An insulating block (27) arranged under the rotating guide frame (26) is arranged between the rotating guide frame (26) and the connecting wire (22), and an arc-shaped groove is formed under the insulating block (27); four grooves are formed in the side face of the plug connector (21), four limiting blocks (23) are arranged in the connecting cavity (20), and the limiting blocks (23) are arranged in the grooves.
  2. 2. An outdoor high voltage current limiting fuse as defined in claim 1 wherein said fuse wire (176) is a steel wire having a diameter of 0.2mm to 0.3mm and said copper wire (179) has a diameter of 0.3mm to 0.4mm.
  3. 3. An outdoor high-voltage current limiting fuse as defined in claim 2 wherein said connecting insulating sleeve (178) and said guide sleeve (171) are each provided with an air hole (18).
  4. 4. An outdoor high voltage current limiting fuse as defined in claim 3 wherein quartz sand is filled between said struts (16) and the epoxy tube (9).
  5. 5. The outdoor high-voltage current-limiting fuse of claim 4, wherein two extension columns (31) are installed in the rotary seat (24), torsion springs (32) are sleeved outside the extension columns (31), one ends of the torsion springs (32) are inserted into the connecting frame (29), and the other ends of the torsion springs (32) are abutted to the surface of the rotary seat (24).
  6. 6. An outdoor high voltage current limiting fuse as defined in claim 5 wherein said connector (19) is an insulating sleeve.

Description

Outdoor high-voltage current-limiting fuse Technical Field The invention belongs to the technical field of fuses, and particularly relates to an outdoor high-voltage current-limiting fuse. Background Outdoor high-voltage current limiting fuses are key components in power systems for protecting transformers, capacitor banks, motors, and the like from overload and short-circuit currents. The high-voltage current-limiting fuse is a key element for protecting equipment such as a voltage transformer, a power transformer and the like in a power system. When a short-circuit fault occurs in the power system, the fuse cuts off fault current through melt fusing, so that electrical equipment is protected from damage. Along with the extension of the power grid construction to outdoor environment, the structure reliability, the installation adaptability and the functional stability of the outdoor high-voltage current-limiting fuse are required to be higher. The existing outdoor high-voltage current-limiting fuse generally adopts an epoxy tube as an insulating main body, a pillar is arranged in the tube, a melt is wound on the pillar, and two ends of the epoxy tube are sealed through metal end caps and serve as electric connection ends. However, the working principle of the existing fuse mainly depends on heat generated by overload or short-circuit current to melt the melt. However, when the fault current approaches the critical value of the minimum melting current, or the melt undergoes multiple current impact to age and change the metallographic structure, the melt may not be melted quickly and cleanly within a preset time, especially in an environment with large outdoor temperature difference and frequent expansion and contraction of the melt, the contact state between the melt and the filling medium (such as quartz sand) changes, and the arc extinguishing capability is reduced. Once the melt is adhered and cannot be completely disconnected, fault current cannot be effectively cut off, fault points are continuously present, the power failure range is enlarged, even upstream switch equipment is burnt, the operation safety of a power system is seriously threatened, and therefore an outdoor high-voltage current-limiting fuse needs to be designed to solve the problems. Disclosure of Invention In order to make up for the defects of the prior art, the invention provides an outdoor high-voltage current-limiting fuse. The invention is mainly used for solving the problem that the safety of a power system is affected because the existing fuse is not thoroughly fused. The outdoor high-voltage current-limiting fuse comprises an epoxy tube, wherein an upper locking ring and a lower locking ring are sleeved at the upper end and the lower end of the epoxy tube respectively, a static contact piece is arranged on the upper locking ring and is arranged below an anti-icing cover through bolts, a first spring is arranged on the static contact piece, the other end of the first spring is arranged below the anti-icing cover, an upper mounting steel foot is arranged on the side face of the anti-icing cover, a support plate is arranged on the lower bolt of the anti-icing cover, a hook is arranged on the side face of the support plate, the hook is arranged on the outer surface of the epoxy tube, a rotating seat is hinged to the side face of the lower locking ring, the rotating seat is rotatably connected in a connecting frame, the connecting frame is arranged below the lower mounting steel foot, the upper mounting steel foot and the lower mounting steel foot are respectively arranged at the upper end and the lower end of an insulating porcelain bottle, a lower outer cap is arranged at the bottom end of the epoxy tube, an upper outer cap is arranged at the top end of the epoxy tube, a connecting wire is arranged below the upper outer cap, a connecting wire is arranged on the lower end of the anti-icing cover, a first connecting wire is arranged in the connecting sleeve, a connecting sleeve is arranged in the connecting sleeve, a connecting sleeve is arranged between the connecting sleeve and is connected with a first connecting sleeve, a connecting sleeve is arranged in the connecting sleeve, a connecting sleeve is connected with a connecting sleeve is arranged in the connecting sleeve, and is connected with a connecting sleeve. According to the technical scheme, the impactor comprises a guide sleeve arranged in a strut, the guide sleeve is of a cylindrical structure with an opening at the bottom end, the opening at the bottom end of the guide sleeve penetrates through a lower outer cap to be communicated with a connecting cavity, a limiting ring is arranged in the guide sleeve, a firing pin is arranged on the inner wall of the limiting ring and is of a cylindrical structure with an opening at the top, a brass pad is arranged in the firing pin, a second spring is arranged on the brass pad, the top end of the second spring is fixedly connected w