Monitoring device of vacuum circuit breaker

Abstract

The utility model belongs to the technical field of vacuum circuit breakers, and particularly relates to a monitoring device of a vacuum circuit breaker, which comprises a control box, a plurality of mounting pipes are fixedly communicated on the control box, the outer surfaces of the mounting pipes are fixedly communicated with input connecting pipes and output connecting pipes, and an insulating rod is driven to move up and down through a metal rod. When the sliding contact slides on the outer surface of the resistance wire, the resistance value detected by the resistance detection sensor changes, the maximum resistance value is generated after the moving contact and the static contact are in stable contact, the moving contact or the static contact is abraded after being used for many times, the displacement stroke of the abraded metal rod is lengthened, and the service life of the moving contact or the static contact is prolonged. When the vacuum circuit breaker is abraded, the maximum resistance value detected by the resistance detection sensor is also increased, and the abrasion loss of the contact of the vacuum circuit breaker is obtained by subtracting the previous maximum resistance value generated by non-abrasion from the current maximum resistance value generated after abrasion, so that the judgment by personnel is facilitated, and the personnel can know the maintenance and replacement time conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum circuit breakers, in particular to a monitoring device for vacuum circuit breakers. Background Art

[0002] A vacuum circuit breaker is a type of circuit breaker that utilizes vacuum insulation and is widely used in power systems. It utilizes vacuum media as electrical insulation and arc extinguishing media, can effectively cut off and connect circuits, and has the advantages of fast arc extinguishing, high reliability, and strong resistance to pollution flashover. It is widely used in high-voltage and ultra-high-voltage power grids and industrial fields.

[0003] Vacuum circuit breakers are crucial components of power systems, requiring significant maintenance and high costs. Statistics indicate that over half of substation maintenance costs are spent on high-voltage circuit breakers, with 60% of this spent on minor repairs and routine overhauls. Consequently, an online monitoring device for vacuum circuit breakers is required. The structure of a vacuum circuit breaker primarily comprises a housing, a contact mechanism, an arc extinguishing system, an operating mechanism, and a magnetic trip mechanism. The contact mechanism includes a moving contact and a stationary contact. The moving contact is provided with a moving contact point, while the stationary contact is provided with a stationary contact point.

[0004] The existing vacuum circuit breaker monitoring device has certain disadvantages when in use. When in use, the existing vacuum circuit breaker monitoring device cannot monitor the degree of wear of the moving contacts and static contacts of the vacuum circuit breaker. During the switching process of the vacuum circuit breaker, the contact contacts will oxidize and cause wear. It is impossible to effectively judge the amount of contact wear of the vacuum circuit breaker, making it inconvenient for personnel to judge whether the contacts of the vacuum circuit breaker need to be replaced. To this end, we propose a vacuum circuit breaker monitoring device. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a monitoring device for a vacuum circuit breaker, which solves the background problem.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A monitoring device for a vacuum circuit breaker includes a control box, wherein the control box is fixedly connected to a plurality of mounting tubes, the outer surfaces of the mounting tubes are fixedly connected to an input connecting tube and an output connecting tube, a vacuum arc chamber is formed inside the mounting tube, a static contact is provided above the interior of the vacuum arc chamber, a moving contact is provided below the interior of the vacuum arc chamber, a metal rod is fixedly connected to the bottom of the moving contact, an insulating rod is fixedly connected to the metal rod, a connecting tube that communicates with the vacuum arc chamber is fixedly connected to the mounting tube, the insulating rod extends into the interior of the connecting tube, an insulating sleeve is fixedly installed inside the connecting tube, a resistance wire is wound on the insulating sleeve, a conductive block is fixedly connected to the insulating rod, a sliding contact is fixedly connected to the conductive block, and a controller and a resistance detection sensor are installed on the control box.

[0008] Preferably, a distribution pole is slidably provided on the conductive block, the distribution pole is electrically connected to the positive input terminal of the resistance detection sensor through a wire, one end of the resistance wire is electrically connected to the negative input terminal of the resistance detection sensor through a wire, and the output terminal of the resistance detection sensor is electrically connected to the controller through a wire.

[0009] Preferably, an input conductive connecting rod is fixedly installed on the input connecting tube, the input conductive connecting rod is electrically connected to the static contact, the bottom of the metal rod is fixedly connected to a sliding seat, the sliding seat is slidably connected to the inner wall of the mounting tube, the bottom of the sliding seat is hinged with an insulating pull rod, the inside of the output connecting tube is fixedly installed with an output conductive connecting rod, the end of the output conductive connecting rod is fixedly connected to a metal sleeve, and the metal sleeve is slidably sleeved on the outer surface of the metal rod.

[0010] Preferably, the metal rod slides into the interior of the vacuum interrupter chamber.

[0011] Preferably, a fixing block is fixedly connected to the interior of the communicating tube, a plurality of communicating holes are opened on the fixing block, and an air pressure detection gauge is installed on the top of the communicating tube.

[0012] Preferably, a plurality of first annular protrusions are fixedly sleeved on the outer surface of the mounting tube, and a plurality of second annular protrusions are fixedly sleeved on the outer surface of the connecting tube.

[0013] Beneficial effects

[0014] The utility model provides a monitoring device for a vacuum circuit breaker. Compared with the prior art, it has the following beneficial effects:

[0015] 1. The monitoring device of the vacuum circuit breaker, the resistance value detected by the resistance detection sensor will change when the sliding contact slides on the outer surface of the resistance wire, the maximum resistance value is generated after the moving contact and the static contact are in stable contact, after multiple uses, the moving contact or the static contact will be worn, after the wear, the displacement stroke of the metal rod will be lengthened, the maximum resistance value detected by the resistance detection sensor will also be higher, the wear amount of the contact contact of the vacuum circuit breaker is the maximum resistance value generated after the wear minus the maximum resistance value generated before the wear, thereby facilitating personnel to judge and facilitating personnel to know the maintenance replacement time.

[0016] 2. The monitoring device of the vacuum circuit breaker, the vacuum pressure inside the vacuum arc-extinguishing chamber can be detected through the installed air pressure detection table to monitor whether the vacuum arc-extinguishing chamber leaks. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of the front structure of the main body of the utility model;

[0018] Figure 2 It is a schematic view of the side structure of the main body of the utility model;

[0019] Figure 3 It is a schematic view of the installation pipe structure of the utility model;

[0020] Figure 4 It is a schematic view of the cross section structure of the installation pipe of the utility model;

[0021] Figure 5 It is a schematic view of the cross section structure of the installation pipe of the utility model; Figure 4 It is an enlarged schematic view of the structure at A in the utility model.

[0022] In the drawing: 1, control box; 2, controller; 3, installation pipe; 4, communication pipe; 5, second annular protrusion; 6, air pressure detection table; 7, input connection pipe; 8, output connection pipe; 9, first annular protrusion; 10, insulation pull rod; 11, sliding seat; 12, metal sleeve; 13, distribution pole; 14, insulation sleeve; 15, input conductive connecting rod; 16, fixed block; 17, static contact; 18, sliding contact; 19, insulation rod; 20, moving contact; 21, vacuum arc-extinguishing chamber; 22, output conductive connecting rod; 23, conductive block; 24, resistance wire; 25, metal rod. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] See also Figure 1-5 The utility model provides a technical solution: a monitoring device for a vacuum circuit breaker, comprising a control box 1, a plurality of mounting tubes 3 fixedly connected to the control box 1, the outer surface of the mounting tube 3 is fixedly connected with an input connecting tube 7 and an output connecting tube 8, a vacuum interrupter 21 is formed inside the mounting tube 3, a static contact 17 is arranged above the interior of the vacuum interrupter 21, a moving contact 20 is arranged below the interior of the vacuum interrupter 21, a metal rod 25 is fixedly connected to the bottom of the moving contact 20, an insulating rod 19 is fixedly connected to the metal rod 25, a connecting tube 4 fixedly connected to the vacuum interrupter 21 is connected to the mounting tube 3, the insulating rod 19 extends into the interior of the connecting tube 4, an insulating sleeve 14 is fixedly installed inside the connecting tube 4, a resistance wire 24 is wound on the insulating sleeve 14, a conductive block 23 is fixedly connected to the insulating rod 19, a sliding contact 18 is fixedly connected to the conductive block 23, and a controller 2 and a resistance detection sensor are installed on the control box 1.

[0025] When the switch is opened or closed, the metal rod 25 drives the moving contact 20 to move up and down. When the metal rod 25 moves, it will drive the insulating rod 19, the conductive block 23 and the sliding contact 18 to move up and down. When the sliding contact 18 slides on the outer surface of the resistance wire 24, the resistance value detected by the resistance detection sensor will change. When the moving contact 20 is in stable contact with the static contact 17, the maximum resistance value is generated. After repeated use, the moving contact 20 or the static contact 17 will be worn. After wear, the metal rod 25 will have a longer displacement stroke, and the maximum resistance value detected by the resistance detection sensor will also become higher. The maximum resistance value generated after the current wear minus the maximum resistance value generated before wear is the wear amount of the contact contact of the vacuum circuit breaker, which is convenient for personnel to make judgments and know the maintenance and replacement time.

[0026] A distribution pole 13 is slidably penetrated on the conductive block 23, and the distribution pole 13 is electrically connected to the positive input terminal of the resistance detection sensor through a wire. One end of the resistance wire 24 is electrically connected to the negative input terminal of the resistance detection sensor through a wire, and the output terminal of the resistance detection sensor is electrically connected to the controller 2 through a wire.

[0027] An input conductive connecting rod 15 is fixedly installed on the input connecting tube 7, and the input conductive connecting rod 15 is electrically connected to the static contact 17. The bottom of the metal rod 25 is fixedly connected to a sliding seat 11, and the sliding seat 11 is slidingly connected to the inner wall of the mounting tube 3. An insulating pull rod 10 is hinged at the bottom of the sliding seat 11. An output conductive connecting rod 22 is fixedly installed inside the output connecting tube 8, and the end of the output conductive connecting rod 22 is fixedly connected to a metal sleeve 12, which is slidably sleeved on the outer surface of the metal rod 25.

[0028] The metal rod 25 slides into the interior of the vacuum interrupter 21 .

[0029] The interior of the connecting pipe 4 is fixedly connected with a fixing block 16 , which is provided with a plurality of connecting holes. An air pressure detection gauge 6 is installed on the top of the connecting pipe 4 .

[0030] The installed air pressure detection meter 6 can detect the vacuum pressure of the inner wall of the vacuum interrupter 21 to monitor whether there is any air leakage inside the vacuum interrupter 21 .

[0031] The outer surface of the mounting tube 3 is fixedly sleeved with a plurality of first annular protrusions 9, and the outer surface of the connecting tube 4 is fixedly sleeved with a plurality of second annular protrusions 5. The provision of the first annular protrusions 9 and the second annular protrusions 5 can increase the contact area between the mounting tube 3 and the outside, facilitating heat dissipation.

[0032] Working principle: When the switch is on or off, the switch structure inside the control box 1 will drive the sliding seat 11 to move up and down through the insulating pull rod 10. When the sliding seat 11 moves up and down, it will drive the metal rod 25 to move up and down. The metal rod 25 drives the moving contact 20 to move up and down. When the metal rod 25 moves, it will drive the insulating rod 19, the conductive block 23 and the sliding contact 18 to move up and down. When the sliding contact 18 slides on the outer surface of the resistance wire 24, the resistance value detected by the resistance detection sensor will change. When the moving contact 20 is in stable contact with the static contact 17, the maximum resistance value is generated. After repeated use, the moving contact 20 or the static contact 17 will wear out. After wear, the metal rod 25 will have a longer displacement stroke, and the maximum resistance value detected by the resistance detection sensor will also become higher. The maximum resistance value generated after the current wear minus the maximum resistance value generated before wear is the contact wear amount of the vacuum circuit breaker, which is convenient for personnel to make judgments and know the maintenance and replacement time.

[0033] The installed air pressure detection meter 6 can detect the vacuum pressure of the inner wall of the vacuum interrupter 21 to monitor whether there is any air leakage inside the vacuum interrupter 21 .

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A monitoring device for a vacuum circuit breaker, comprising a control box (1), characterized in that: The control box (1) is fixedly connected to a plurality of mounting tubes (3), the outer surfaces of the mounting tubes (3) are fixedly connected to input connecting tubes (7) and output connecting tubes (8), a vacuum interrupter (21) is formed inside the mounting tubes (3), a static contact (17) is provided above the interior of the vacuum interrupter (21), a moving contact (20) is provided below the interior of the vacuum interrupter (21), a metal rod (25) is fixedly connected to the bottom of the moving contact (20), and an insulating rod is fixedly connected to the metal rod (25). (19), a connecting pipe (4) communicating with the vacuum arc extinguishing chamber (21) is fixedly connected to the mounting pipe (3), the insulating rod (19) extends into the interior of the connecting pipe (4), an insulating sleeve (14) is fixedly installed inside the connecting pipe (4), a resistance wire (24) is wound around the insulating sleeve (14), a conductive block (23) is fixedly connected to the insulating rod (19), a sliding contact (18) is fixedly connected to the conductive block (23), and a controller (2) and a resistance detection sensor are installed on the control box (1).

2. A monitoring device for a vacuum circuit breaker according to claim 1, characterized in that: A distribution pole (13) is slidably provided on the conductive block (23), the distribution pole (13) is electrically connected to the positive input terminal of the resistance detection sensor via a wire, one end of the resistance wire (24) is electrically connected to the negative input terminal of the resistance detection sensor via a wire, and the output terminal of the resistance detection sensor is electrically connected to the controller (2) via a wire.

3. The monitoring device for a vacuum circuit breaker according to claim 2, characterized in that: An input conductive connecting rod (15) is fixedly mounted on the input connecting tube (7), and the input conductive connecting rod (15) is electrically connected to the static contact (17). A sliding seat (11) is fixedly connected to the bottom of the metal rod (25), and the sliding seat (11) is slidably connected to the inner wall of the mounting tube (3). An insulating pull rod (10) is hingedly connected to the bottom of the sliding seat (11). An output conductive connecting rod (22) is fixedly mounted inside the output connecting tube (8), and a metal sleeve (12) is fixedly connected to the end of the output conductive connecting rod (22), and the metal sleeve (12) is slidably sleeved on the outer surface of the metal rod (25).

4. The monitoring device for a vacuum circuit breaker according to claim 3, characterized in that: The metal rod (25) slides and extends into the interior of the vacuum interrupter (21).

5. The monitoring device for a vacuum circuit breaker according to claim 4, characterized in that: The interior of the communicating tube (4) is fixedly connected to a fixing block (16), a plurality of communicating holes are provided on the fixing block (16), and an air pressure detection gauge (6) is installed on the top of the communicating tube (4).

6. The monitoring device for a vacuum circuit breaker according to claim 5, characterized in that: The outer surface of the installation tube (3) is fixedly sleeved with a plurality of first annular protrusions (9), and the outer surface of the connecting tube (4) is fixedly sleeved with a plurality of second annular protrusions (5).

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