CN216562994U - Protective fast fuse for high-voltage line - Google Patents
Protective fast fuse for high-voltage line Download PDFInfo
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- CN216562994U CN216562994U CN202123205007.1U CN202123205007U CN216562994U CN 216562994 U CN216562994 U CN 216562994U CN 202123205007 U CN202123205007 U CN 202123205007U CN 216562994 U CN216562994 U CN 216562994U
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Abstract
The utility model relates to a protective fast fuse for a high-voltage line. The technical scheme is as follows: a supporting insulator and a protective tube are arranged between an upper end connecting sheet and a lower end connecting sheet, wherein the protective tube is formed by connecting a non-current-limiting fusing device and a current-limiting fuse device; the current-limiting fuse device is composed of a high-voltage current-limiting fuse and a current-guiding resistor, and the current-guiding resistor is connected in parallel at two ends of one side of the high-voltage current-limiting fuse. The beneficial effects are that: when the equipment fails, the non-current limiting device and the current limiting device can be replaced after the equipment is disassembled and can be repeatedly used, so that the power failure range expansion caused by fault override is effectively avoided, and the production of non-fault users is influenced; the damage degree of the protected electrical equipment is effectively reduced, and the repair cost is saved.
Description
Technical Field
The utility model relates to a protection device for a high-voltage line, in particular to a protection type fast fuse for the high-voltage line.
Background
At present, current protection devices at the tail end of a high-voltage power supply and distribution line and at the high-voltage side of an oil well power supply system of each oil production plant are all drop-out fuses (commonly called tokens), and a traditional token consists of a protective tube, a pull ring, a fixing bolt, a connecting sheet and a supporting insulator. The fuse tube is composed of a fuse wire and a fuse tube which are suitable for current specification, when current exceeding the fuse wire flows, the fuse tube acts according to inverse time limit characteristic, and the larger the current is, the shorter the fusing time is. Generally, the fusing time is more than half cycle, i.e. 10 ms. This type of protection may cause the condition that when a three-phase short circuit or a two-phase short circuit fault (not an overload fault) occurs in the electrical equipment below the non-current-limiting fuse device, the fuse is not yet fused, resulting in an enlarged power failure range due to the superior protection action thereof. The production of non-fault users is seriously influenced, unnecessary power failure loss is caused, and the stability of line power supply is reduced.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides the protective type fast fuse for the high-voltage line, the outdoor telegraph pole cross arm is installed, the volume is small, the installation is convenient, the overload protection and current-limiting protection functions can be realized, and the post-fault drop-off mode is convenient for people to check; the power failure range expansion caused by fault override is effectively avoided, and the production of non-fault users is influenced; the damage degree of the protected electrical equipment is effectively reduced, and the repair cost is saved.
The utility model provides a protective fast fuse for a high-voltage line, which adopts the technical scheme that: comprises an upper end connecting sheet (1), a lower end connecting sheet (3), a protective tube (4), an upper connecting terminal (5), a lower connecting terminal (6), a supporting insulator (8) and a fixed mounting plate (9), wherein the supporting insulator (8) is arranged between the upper end connecting sheet (1) and the lower end connecting sheet (3), the fixed mounting plate (9) is arranged on one side of the supporting insulator (8), the protective tube (4) is also arranged between the upper end connecting sheet (1) and the lower end connecting sheet (3), the lower end of the protective tube (4) is movably connected with the lower end connecting sheet (3), the upper end of the protective tube (4) is movably connected with the upper end connecting sheet (1), wherein the protective tube (4) is formed by connecting a non-current-limiting fuse device (4.1) and a current-limiting fuse device (4.2), the non-current-limiting fuse device (4.1) is formed by a fuse wire (4.1.1) and a fuse tube (4.1.2), a fuse wire (4.1.1) is arranged in the fuse tube (4.1.2), one end of the fuse wire (4.1.1) is connected with a joint at the lower end of the fuse tube (4), and the other end of the fuse wire is connected with a current-limiting fuse device (4.2); the current-limiting fuse device (4.2) consists of a high-voltage current-limiting fuse (4.2.1) and a current-guiding resistor (4.2.2), and the two ends of one side of the high-voltage current-limiting fuse (4.2.1) are connected with the current-guiding resistor (4.2.2) in parallel.
Preferably, the lower ends of the high-voltage current-limiting fuse (4.2.1) and the current-guiding resistor (4.2.2) are connected with a fuse wire of the non-current-limiting fuse device (4.1), and the upper end of the high-voltage current-limiting fuse device is connected with an upper end connector of the fuse tube (4).
Preferably, a metal pull ring (7) is arranged at the upper end of the protective tube (4).
Preferably, the lower side of the upper end connecting piece (1) is provided with an elastic mechanism (2) and a buckle (10), the elastic mechanism (2) comprises a spring (2.1) and an elastic sheet (2.2), and the upper side of the elastic sheet (2.2) is provided with the spring (2.1).
Preferably, the installation included angle between the fixed installation plate (9) and the supporting insulator (8) is 45 degrees.
Preferably, the supporting insulator (8) is made of high-pressure soft silica gel.
The utility model has the beneficial effects that: the protective tube adopted by the utility model combines the non-current-limiting device and the current-limiting device together, thereby changing the traditional override trip phenomenon caused by that only the overload protection function is used and the current-limiting function is not used, reducing the power failure range and the adverse effect caused by power failure and improving the power supply stability of a power grid; the current protection device is widely used for high-voltage side of power supply equipment of oil pumping units in large oil fields at the tail end of 6/10kV lines, and high-voltage wire inlet side of transformers of users in middle and small industries and the like; the outdoor type product has small size, pollution resistance, easy maintenance, quick protection and convenient installation, and is suitable for professional operation; when the equipment fails, the non-current limiting device and the current limiting device can be replaced after the equipment is disassembled and can be repeatedly used, so that the power failure range expansion caused by fault override is effectively avoided, and the production of non-fault users is influenced; the damage degree of the protected electrical equipment is effectively reduced, and the repair cost is saved.
Drawings
FIG. 1 is a schematic view of the external structure of the present invention;
FIG. 2 is a schematic structural view of the fuse and after disconnection of the present invention;
FIG. 3 is a schematic view of the field installation of the present invention;
in the upper diagram: upper end connection piece 1, elastic mechanism 2, lower extreme connection piece 3, protective tube 4, go up binding post 5, lower binding post 6, metal pull ring 7, support insulator 8, fixed mounting panel 9, buckle 10, circular slot shape couple 11, spring 2.1, shell fragment 2.2, non-current-limiting fuse device 4.1, current-limiting fuse device 4.2, fuse 4.1.1, fusion tube 4.1.2, high-pressure current-limiting fuse 4.2.1, drainage resistance 4.2.2, protection type fast acting fuse a for high-voltage line, high-voltage arrester b, pole c, high-voltage line d, transformer e, earthing pole f, low tension cable g.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Preferably, the lower ends of the high-voltage current-limiting fuse 4.2.1 and the current-guiding resistor 4.2.2 are connected with a fuse wire of the non-current-limiting fuse device 4.1, and the upper end is connected with an upper end connector of the fuse tube 4.
Preferably, a metal pull ring 7 is provided at the upper end of the fuse tube 4.
Preferably, the lower side of the upper end connecting piece 1 is provided with an elastic mechanism 2 and a buckle 10, the elastic mechanism 2 comprises a spring 2.1 and an elastic sheet 2.2, and the upper side of the elastic sheet 2.2 is provided with the spring 2.1.
Preferably, the installation angle between the fixed installation plate 9 and the support insulator 8 is 45 degrees.
Preferably, the supporting insulator 8 is made of high-pressure soft silica gel, so that the insulating property is excellent, the corrosion resistance and the aging resistance are good, the flexibility is good, the damage to equipment in the transportation and installation processes is effectively reduced, and the service life is long.
In addition, a round groove-shaped hook 11 is arranged on one side of the lower end connecting sheet 3, so that the lower end of the protective tube 4 is conveniently installed and connected with the lower end of the protective tube.
When the high-voltage side protection circuit is installed and applied on site, the high-voltage side protection circuit comprises a high-voltage line protection type fast fuse a, a high-voltage lightning arrester b, an electric pole c, a high-voltage line d, a transformer e, a grounding electrode f and a low-voltage cable g, and current protection on the high-voltage side is achieved through the high-voltage line protection type fast fuse a, referring to fig. 3.
The working principle of the protective fast fuse a for the high-voltage line provided by the utility model is as follows:
the traditional fuse tube is divided into an upper structure and a lower structure which are respectively a non-current-limiting fuse device 4.1 and a current-limiting fuse device 4.2, and the volume of the equipment is reduced by combining the two structures together. The upper end connecting sheet and the lower end connecting sheet which are connected with the protective tube are made of copper metal with good conductivity, the elastic mechanism 2 is arranged on the upper end connecting sheet 1, the fastening force and the contact area of the protective tube during contact are effectively increased, and current can be better conducted. One side of lower extreme connection piece 3 is equipped with circular slot shape couple 11, and the cylindrical structure of cooperation protective tube 4 can be operated in the same direction as smooth, makes things convenient for on-spot erection joint. An upper wiring terminal 5 and a lower wiring terminal 6 for incoming and outgoing wires are respectively arranged at the top ends of the upper and lower end connecting sheets, so that the connection of on-site high-voltage wires is facilitated. The protective tube 4 is designed into a drop-type structure, when equipment breaks down, the protective tube 4 drops after action, so that the operating condition of the equipment can be clearly observed by workers, and the operation and maintenance of the equipment on site are facilitated. The upper end of the protective tube 4 is provided with a metal pull ring 7, so that the insulating rod can be conveniently used for power on-site power cut and transmission operation. The main structure of the protective tube 4 and the supporting insulator 8 is designed to be a split structure, the protective tube 4 can be simply combined or removed, the protective tube 4 can be removed in a place where power failure or temporary power supply is not needed, the possibility of mistaken power transmission and misoperation is effectively prevented, and the power supply safety is improved. The protective tube 4 is designed into a detachable non-current-limiting fuse device 4.1 and a detachable current-limiting fuse device 4.2, and after the equipment breaks down, the non-current-limiting fuse device 4.1 and the current-limiting fuse device 4.2 can be replaced after the equipment is detached, so that the protective tube can be repeatedly used, and the use cost of the equipment is reduced.
In addition, the principle of the non-limiting fuse device 4.1 is: when a current exceeding the fuse 4.1.1 flows, the operation is performed according to an inverse time limit characteristic, and the larger the current is, the shorter the fusing time is. Generally, the fusing time is more than half cycle, i.e. 10 ms. If only this type of protection is provided, it may be the case that when a three-phase short circuit or a two-phase short circuit fault (not an overload fault) occurs in the electrical equipment below the non-current-limiting fuse device, the fuse is not yet blown, and the power failure range is expanded due to the action of the upper-stage protection. In order to avoid this, it is necessary to complete the protective function, i.e. to add a current-limiting fuse device 4.2 for the current-limiting disconnection of the electrical apparatus in the event of a three-phase short circuit or a two-phase short circuit fault. The current-limiting fuse device 4.2 is composed of a high-voltage current-limiting fuse 4.2.1 and a current-guiding resistor 4.2.2, when a short-circuit current passes through, the high-voltage current-limiting fuse 4.2.1 cuts off the short-circuit current within 10 milliseconds, and at the moment, superior protection does not act in time, so that the aim of meeting the protection selectivity of electrical equipment is fulfilled. In order to realize the safety requirement that the current-limiting fuse automatically falls off after the fault is removed and an obvious disconnection point is formed, the two ends of the current-limiting fuse are connected with the current-guiding resistor 4.2.2 in parallel, and the short-circuit current is limited below a superior backup protection action value.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it to an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent changes made according to the technical solution of the present invention shall fall within the scope of the present invention as claimed.
Claims (6)
1. The utility model provides a protection type fast acting fuse for high-voltage line, including upper end connection piece (1), lower extreme connection piece (3), protective tube (4), go up binding post (5), lower binding post (6), support insulator (8), fixed mounting board (9), erection bracing insulator (8) between upper end connection piece (1) and lower extreme connection piece (3), one side of support insulator (8) is equipped with fixed mounting board (9), still be equipped with protective tube (4) between upper end connection piece (1) and lower extreme connection piece (3), the lower extreme and lower extreme connection piece (3) swing joint of protective tube (4), the upper end and upper end connection piece (1) swing joint of protective tube (4), characterized by: the fuse tube (4) is formed by connecting a non-current-limiting fuse device (4.1) and a current-limiting fuse device (4.2), the non-current-limiting fuse device (4.1) is formed by a fuse wire (4.1.1) and a fuse tube (4.1.2), the fuse wire (4.1.1) is arranged in the fuse tube (4.1.2), one end of the fuse wire (4.1.1) is connected with a joint at the lower end of the fuse tube (4), and the other end of the fuse wire is connected with the current-limiting fuse device (4.2); the current-limiting fuse device (4.2) consists of a high-voltage current-limiting fuse (4.2.1) and a current-guiding resistor (4.2.2), and the two ends of one side of the high-voltage current-limiting fuse (4.2.1) are connected with the current-guiding resistor (4.2.2) in parallel.
2. The protective fast fuse of claim 1, wherein: the lower ends of the high-voltage current-limiting fuse (4.2.1) and the current-guiding resistor (4.2.2) are connected with a fuse wire of the non-current-limiting fuse device (4.1), and the upper end of the high-voltage current-limiting fuse is connected with an upper end connector of the protective tube (4).
3. The protective fast fuse of claim 2, wherein: the upper end of the protective tube (4) is provided with a metal pull ring (7).
4. A protective fast fuse for high voltage lines as claimed in claim 3, wherein: the downside of upper end connection piece (1) is equipped with elastic mechanism (2) and buckle (10), elastic mechanism (2) including spring (2.1) and shell fragment (2.2), be equipped with spring (2.1) in the upside of shell fragment (2.2).
5. The protective fast fuse of claim 1, wherein: and the installation included angle between the fixed installation plate (9) and the support insulator (8) is 45 degrees.
6. The protective type fast fuse for a high voltage line according to claim 5, wherein: the supporting insulator (8) adopts high-pressure soft silica gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123205007.1U CN216562994U (en) | 2021-12-20 | 2021-12-20 | Protective fast fuse for high-voltage line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123205007.1U CN216562994U (en) | 2021-12-20 | 2021-12-20 | Protective fast fuse for high-voltage line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216562994U true CN216562994U (en) | 2022-05-17 |
Family
ID=81544944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123205007.1U Active CN216562994U (en) | 2021-12-20 | 2021-12-20 | Protective fast fuse for high-voltage line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216562994U (en) |
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2021
- 2021-12-20 CN CN202123205007.1U patent/CN216562994U/en active Active
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