Locomotive zinc oxide arrester monitoring device

Abstract

The embodiment of the utility model provides a locomotive zinc oxide lightning arrester monitoring device, and relates to the field of lightning arresters. The locomotive zinc oxide arrester monitoring device comprises a connecting assembly, a current transformer, a mainboard and a shell, the connecting assembly is connected with a grounding terminal of a zinc oxide lightning arrester, and the current transformer is arranged in the shell; the connecting assembly comprises a first mounting part, a second mounting part, a first screw rod, a butterfly nut and a conductor; in the installation process, opening and closing of the connecting assembly can be achieved only by unscrewing the butterfly nut and pulling out the first screw rod, the connecting assembly can be conveniently wound on the grounding terminal of the zinc oxide lightning arrester, and firm installation is ensured through threaded connection and a containing groove fixing structure. The installation steps are simplified, the operation convenience is improved, and the problem that in the prior art, a connecting assembly is tedious to install is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lightning arrester, specifically point to a locomotive zinc oxide lightning arrester monitoring devices. BACKGROUND

[0002] The zinc oxide lightning arrester of railway passenger car is the important protection equipment in locomotive power supply system, and its function is to protect various electrical equipment in the locomotive power system, prevent the damage of lightning overvoltage, operating overvoltage and power frequency transient overvoltage impact to equipment.The lightning arrester passes through the overvoltage and leads into the ground, thereby guaranteeing the safe and stable operation of the locomotive power supply system, avoids the electrical equipment failure caused by overvoltage.

[0003] In the prior art, the failure of zinc oxide lightning arrester is mainly caused by two factors. First, lightning and other external voltage impact is the main reason leading to the damage of lightning arrester. The lightning arrester will bear large electrical stress when coping with these overvoltages, and its performance may decrease or fail after long-term use.

[0004] Secondly, the partial discharge in the lightning arrester is another important reason leading to the failure. The partial discharge is usually caused by uneven internal electric field distribution, and the uneven electric field distribution may be caused by valve piece deterioration or improper assembly. There are gaps between the metal components in the lightning arrester, which are also easy to cause partial discharge. Long-term partial discharge not only causes damage to the internal insulation material of the lightning arrester, but also may cause internal flashover, eventually leading to the failure of the lightning arrester.

[0005] At present, the detection of lightning arrester mainly depends on manual operation, and usually requires maintenance personnel to climb on the roof of the train for on-site detection. This detection method not only increases the complexity of operation, but also poses a potential threat to the safety of the detection personnel. In addition, the existing detection device is relatively cumbersome to install in actual application, especially under the condition of train operation, and there are many inconveniences in installing and operating these devices. Therefore, how to improve the convenience and safety of lightning arrester detection has become a problem to be solved in the current technical field. UTILITY MODEL CONTENTS

[0006] According to the embodiment of the utility model, a locomotive zinc oxide lightning arrester monitoring device is provided. It is used to solve the problems proposed in the above background technology.

[0007] In the first aspect of the utility model, a locomotive zinc oxide lightning arrester monitoring device is provided.

[0008] The locomotive zinc oxide lightning arrester monitoring device comprises a connecting assembly, a current transformer, a mainboard and a shell; the connecting assembly is connected with the grounding terminal of the zinc oxide lightning arrester, and the current transformer is arranged in the interior of the shell.

[0009] The connecting assembly comprises a first mounting part, a second mounting part, a first screw rod, a butterfly nut and a conductor; one end of the first mounting part and the second mounting part are hingedly connected, one end of the first screw rod is hingedly connected with the end of the first mounting part away from the second mounting part, the end of the second mounting part away from the first mounting part is provided with a receiving groove, the first screw rod is located in the receiving groove, the butterfly nut is threadedly connected with the first screw rod, and the butterfly nut is in contact with the second mounting part; the conductor is connected with the first mounting part, and the conductor is connected with the current transformer through a wire.

[0010] Preferably, the main board is provided with a processor and a communication module; the processor is connected with the current transformer, and the communication module is connected with the processor.

[0011] Preferably, the connecting assembly further comprises two elastic sheets, a second screw rod, a locking plate and a guide column; the conductor is an arc-shaped plate, the wire is fixedly connected through the first mounting part, the conductor is fixedly connected with the wire, the two elastic sheets are fixedly connected with the first mounting part, the two elastic sheets are in contact with the conductor to provide elastic force for the conductor; the second screw rod passes through the second mounting part and is threadedly connected with the second mounting part, one end of the second screw rod close to the first mounting part is rotationally connected with the locking plate, the guide column is fixedly connected with the locking plate, and the guide column passes through the second mounting part and is slidingly connected with the second mounting part.

[0012] Preferably, one end of the second screw rod away from the locking plate is fixedly connected with a tab.

[0013] Preferably, the cross section of the shell is rectangular, and the shell is provided with a fixing assembly at each corner.

[0014] Preferably, the fixing assembly comprises a mounting plate, a pipe body, a suction cup, a suction cup cover, a pull rod and an expansion assembly; the mounting plate is fixedly connected with the shell, the pipe body passes through and is fixedly connected with the mounting plate, the suction cup cover is fixedly connected with the lower end of the pipe body, the suction cup is arranged below the suction cup cover and the edge of the suction cup extends out of the suction cup cover, the lower end of the pull rod is connected with the suction cup, the pull rod is provided with a cavity in the inside, and the expansion assembly is arranged in the cavity and can be extended out of the cavity.

[0015] Preferably, the expansion assembly comprises two protrusions and a spring, the spring is arranged between the two protrusions to provide elastic force for the two protrusions to move away from each other, and a limiting part is arranged on the two protrusions to prevent the protrusions from being separated from the pull rod.

[0016] Preferably, the fixing assembly further comprises a handle arranged at the upper end of the pull rod.

[0017] The one or more technical solutions provided in the application have at least the following technical effects or advantages:

[0018] The locomotive zinc oxide arrester monitoring device provided by the utility model, through the hinged structure of the first mounting part and the second mounting part, the two can rotate relative to each other, forming an open loop structure. During installation, only need to unscrew the butterfly nut and pull out the first screw rod, the opening and closing of the connecting assembly can be realized, which is convenient to wrap around the grounding terminal of the zinc oxide arrester, and then fixed through the threaded connection and the accommodating groove fixing structure, ensuring firm installation. The design simplifies the installation steps, improves the operation convenience, and solves the problem of complicated installation of the connecting assembly in the prior art.

[0019] The conductor in the connecting assembly is designed as an arc-shaped plate, and two elastic sheets are provided for the conductor to provide continuous elastic force, ensuring that the conductor and the grounding terminal of the zinc oxide arrester maintain close contact. The design effectively prevents signal loss or misjudgment caused by poor contact, ensuring reliable transmission of the current signal. At the same time, the current signal is transmitted to the current transformer through the wire, realizing real-time monitoring of the current, and solving the problem of unstable signal transmission in the prior art.

[0020] When the grounding terminal of the zinc oxide arrester has a leakage fault, the current enters the current transformer through the conductor, the current transformer generates an electric signal according to the transmitted current signal, and transmits the electric signal to the mainboard. After receiving the signal, the mainboard can quickly analyze and judge the state of the arrester and send an alarm signal when the leakage fault occurs. This design realizes real-time monitoring and fault alarm, solves the problem of relying on manual detection, low detection efficiency and safety hazards in the prior art.

[0021] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the utility model, nor to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and other features, advantages, and aspects of the embodiments of the utility model will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the drawings, the same or similar reference numerals indicate the same or similar elements, wherein:

[0023] Figure 1 A perspective structural schematic view of a locomotive zinc oxide arrester monitoring device according to the utility model is shown;

[0024] Figure 2 An exploded structural schematic view of a locomotive zinc oxide arrester monitoring device according to the utility model is shown;

[0025] Figure 3 A connection assembly, a main board and a connection structure schematic diagram of a current transformer of the locomotive zinc oxide arrester monitoring device are shown.

[0026] Figure 4 A perspective structure schematic diagram of the connection assembly of the locomotive zinc oxide arrester monitoring device is shown.

[0027] Figure 5 A top view structure schematic diagram of the connection assembly of the locomotive zinc oxide arrester monitoring device is shown.

[0028] Figure 6 A perspective structure schematic diagram of the fixing assembly of the locomotive zinc oxide arrester monitoring device is shown.

[0029] Figure 7 A cross-sectional perspective structure schematic diagram of the fixing assembly of the locomotive zinc oxide arrester monitoring device is shown.

[0030] Figure 8 A cross-sectional structure schematic diagram of the fixing assembly of the locomotive zinc oxide arrester monitoring device is shown.

[0031] Figure 9 A perspective structure schematic diagram of the expansion assembly of the locomotive zinc oxide arrester monitoring device is shown.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1-connection assembly, 11-first mounting portion, 12-second mounting portion, 121-receiving groove, 13-first screw rod, 14-butterfly nut, 15-conductor, 16-elastic sheet, 17-second screw rod, 171-poking piece, 18-locking plate, 19-guide column, 2-current transformer, 21-wire, 3-main board, 31-processor, 32-communication module, 4-housing, 5-fixing assembly, 51-mounting plate, 52-tube body, 53-suction cup, 54-suction cup cover, 55-handle, 56-pull rod, 57-expansion assembly, 571-protruding block, 572-spring, 573-limiting portion. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] like Figures 1 to 9 As shown, the locomotive zinc oxide surge arrester monitoring device comprises: a connection assembly 1, a current transformer 2, a main board 3, and a housing 4. The connection assembly 1 is used to connect to the grounding terminal of the zinc oxide surge arrester, and the current transformer 2 is located inside the housing 4 to monitor the current status of the zinc oxide surge arrester. The main board 3 is a conventional electronic circuit board.

[0037] The connecting assembly 1 includes a first mounting part 11, a second mounting part 12, a first screw 13, a wing nut 14, and a conductor 15. The first mounting part 11 and one end of the second mounting part 12 are hinged together, allowing relative rotation between the two parts. One end of the first screw 13 is hinged to the far end of the first mounting part 11 (i.e., the end furthest from the second mounting part 12). The other end of the second mounting part 12 has a receiving groove 121 for accommodating the first screw 13. The first screw 13 is placed within the receiving groove 121, and the wing nut 14 is threaded onto the first screw 13 and contacts the receiving groove 121 of the second mounting part 12. The conductor 15 is connected to the first mounting part 11 and is connected to the current transformer 2 via a wire 21.

[0038] In use, first loosen the wing nut 14 and pull the first screw 13 out of the receiving groove 121. At this time, the first mounting part 11 and the second mounting part 12 can rotate relative to each other, presenting an open loop state. Next, surround the first mounting part 11 and the second mounting part 12 around the grounding terminal of the zinc oxide surge arrester to form a space for clamping the grounding terminal. Then, insert the first screw 13 into the receiving groove 121 and tighten the wing nut 14 so that the wing nut 14 is in close contact with the receiving groove 121 of the second mounting part 12, thereby firmly fixing the first mounting part 11 and the second mounting part 12 and tightly clamping the grounding terminal of the zinc oxide surge arrester. At this time, the conductor 15 is in direct contact with the grounding terminal of the zinc oxide surge arrester.

[0039] When the grounding terminal of the zinc oxide arrester has a leakage fault, the current flows into the conductor 15 through the grounding terminal, and then is transmitted to the current transformer 2 through the wire 21. The current transformer 2 generates an electric signal according to the transmitted current signal, and sends the signal to the mainboard 3. After receiving the signal, the mainboard 3 can determine whether the zinc oxide arrester has a leakage fault by processing. If there is a leakage fault, a warning signal is sent to prompt the maintenance personnel to overhaul or replace the faulty arrester.

[0040] The grounding terminal of the zinc oxide arrester is made of copper or stainless steel or other materials with good conductivity and certain corrosion resistance, so as to ensure long-term conductivity and reliability. In this embodiment, the grounding terminal of the zinc oxide arrester is a bolt.

[0041] It should be noted that in the normal working state, the main function of the zinc oxide arrester is to protect the power equipment from the impact of overvoltage. In this process, the zinc oxide arrester is usually in a high resistance state. When the voltage is within the normal range, the zinc oxide valve sheet in the zinc oxide arrester has a very high resistance, so the current passing through the arrester is very weak and can be ignored. Even if there is a small amount of current passing through, it will not affect the arrester and the power system.

[0042] However, when the system is struck by lightning or overvoltage, the resistance of the arrester will decrease rapidly, and the conductivity will increase, quickly conducting the overvoltage current to the ground to protect the power equipment from damage. After the overvoltage is eliminated, the resistance of the arrester returns to a high resistance state again, and continues to maintain a normal working state.

[0043] Therefore, in the normal state, due to the high resistance of the zinc oxide arrester, although there may be a very weak current flowing through the arrester, the amount of current is very small and will not affect the operation of the arrester, and can usually be ignored. When the arrester fails, such as internal deterioration or leakage, the current passing through the arrester will increase significantly, which will be monitored by the current transformer 2.

[0044] Specifically, the mainboard 3 integrates a processor 31 and a communication module 32. The processor 31 is connected with the current transformer 2, used to receive the electric signal transmitted by the current transformer 2 and process and analyze the signal; the communication module 32 is connected with the processor 31, used to send the processing result to an external monitoring device or a user terminal, so as to remotely monitor or record the running state of the arrester.

[0045] The current transformer 2 is used to monitor the current signal on the grounding terminal of the zinc oxide arrester. When the current transformer detects the current signal, the processor 31 receives and analyzes the current signal, and judges whether the zinc oxide arrester has a leakage fault according to a pre-set threshold value. If the detected current exceeds the normal range, the processor 31 generates a fault signal and transmits the fault information to an external system or reminds the maintenance personnel through the communication module 32.

[0046] The communication module 32 can adopt various communication modes in the prior art, such as wireless communication, Bluetooth, WIFI or wired communication, so as to realize remote transmission and real-time monitoring of data. This allows the maintenance personnel to obtain the state information of the arrester without on-site detection, greatly improving the maintenance efficiency and safety. The processor 31 is based on a microcontroller or microprocessor in the prior art. In the prior art, the processor 31 can be selected from a single-chip microcomputer or a microprocessor, including but not limited to: an ARM Cortex-M series processor, a PIC microcontroller and an STM32 series processor.

[0047] The connecting assembly 1 in the locomotive zinc oxide arrester monitoring device provided by the utility model further comprises two elastic sheets 16, a second screw rod 17, a locking plate 18 and a guide column 19. The conductor 15 in the connecting assembly 1 is in an arc-shaped plate structure, which can better fit the grounding terminal of the zinc oxide arrester, so as to ensure good electrical contact. The wire 21 passes through the first mounting portion 11 and is fixedly connected thereto, and the wire 21 is fixedly connected with the conductor 15, which is used for transmitting the current signal detected by the conductor 15 to the current transformer 2.

[0048] The two elastic sheets 16 are fixedly connected with the first mounting portion 11 respectively and are in contact with the conductor 15, which is used for providing elastic force for the conductor 15. When the connecting assembly 1 is installed on the grounding terminal of the zinc oxide arrester, the elastic force provided by the elastic sheets 16 enables the conductor 15 to keep close contact with the grounding terminal of the zinc oxide arrester, so as to ensure smooth conduction of the current.

[0049] The second screw rod 17 passes through the second mounting portion 12 and is screw-connected therewith. One end of the second screw rod 17 is close to the first mounting portion 11 and is connected with the locking plate 18 through rotary connection. The guide column 19 is fixedly connected on the locking plate 18, and the guide column 19 passes through the second mounting portion 12 and is slidingly connected therewith. The design of the guide column 19 ensures that the locking plate 18 only moves along the direction of the guide column 19 when the second screw rod 17 is adjusted and tightened, preventing unnecessary rotation of the locking plate 18, so as to maintain the stability of locking.

[0050] In use, when the first mounting portion 11 and the second mounting portion 12 are mounted on the grounding terminal of the zinc oxide arrester, the elastic sheet 16 provides the conductor 15 with a continuous elastic force, so that the conductor 15 is always in close contact with the grounding terminal of the zinc oxide arrester. At this time, by rotating the second screw 17, the locking plate 18 will move. After the second screw 17 is tightened, the locking plate 18 is in close contact with the grounding terminal of the zinc oxide arrester, further enhancing the fixing stability of the connecting assembly 1 and ensuring the close connection between the conductor 15 and the grounding terminal.

[0051] When the zinc oxide arrester has a leakage fault, the leakage current can be smoothly conducted through the conductor 15 and transmitted to the current transformer 2 through the wire 21 for detection, so as to realize real-time monitoring and fault detection of the zinc oxide arrester. The setting of the guide column 19 effectively prevents the locking plate 18 from rotating during the adjustment process, ensures the smoothness and accuracy of the locking process, and further improves the stability and safety of the overall device.

[0052] Specifically, the second screw 17 is fixedly connected with a turning piece 171 at an end away from the locking plate 18. The turning piece 171 is configured to facilitate the rotation of the second screw 17.

[0053] Specifically, the shell 4 has a rectangular cross section, and the shell 4 is provided with a fixing assembly 5 at each corner.

[0054] Specifically, the fixing assembly 5 includes an installation plate 51, a tube body 52, a suction cup 53, a suction cup cover 54, a pull rod 56, and an expansion assembly 57. The installation plate 51 is fixedly connected with the shell 4, the tube body 52 passes through and is fixedly connected with the installation plate 51, the suction cup cover 54 is fixedly connected with the lower end of the tube body 52, the suction cup 53 is arranged below the suction cup cover 54, and the edge of the suction cup 53 extends out of the suction cup cover 54. The lower end of the pull rod 56 is connected with the suction cup 53, the pull rod 56 has a cavity inside, and the expansion assembly 57 is arranged in the cavity and can be extended out of the cavity. The expansion assembly 57 includes two protrusions 571 and a spring 572, the spring 572 is mounted between the two protrusions 571 to provide the two protrusions 571 with an elastic force away from each other, and a limiting portion 573 is arranged on the two protrusions 571 to prevent the protrusions 571 from being separated from the pull rod 56.

[0055] In the initial state, the pull rod 56 is in the pipe body 52, the two protrusions 571 of the expansion assembly 57 are in contact with the inner wall of the pipe body 52, and the suction disc 53 is close to the flat state. The shell 4 needs to be fixed, the shell 4 is placed in a suitable position, and it is ensured that the mounting surface of the shell 4 is a flat surface. Then the pull rod 56 is lifted upward, the pull rod 56 drives the suction disc 53 to deform, the internal space of the suction disc 53 increases after the suction disc 53 is subjected to the pulling force of the pull rod 56, and the suction disc 53 is in a negative pressure state. When the expansion assembly 57 extends out of the pipe body 52, the spring 572 provides elastic force for the protrusion 571, so that the protrusion 571 extends out. At this time, the lower surface of the protrusion 571 is in contact with the upper end of the pipe body 52, the edge of the suction disc cover 54 is in contact with the edge of the suction disc 53, and the suction disc 53 is adsorbed to the mounting surface of the shell 4 by means of the pressure effect. The fixing of the shell 4 is completed.

[0056] Specifically, the fixing assembly 5 further comprises a handle 55 arranged on the upper end of the pull rod 56. The handle 55 is arranged to facilitate the pulling of the pull rod 56.

[0057] The above specific embodiments do not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A locomotive zinc oxide arrester monitoring device, characterized by, The utility model relates to a current transformer, which comprises a connecting assembly (1), a current transformer (2), a mainboard (3) and a shell (4), wherein the connecting assembly (1) is connected with the grounding terminal of a zinc oxide lightning arrester, and the current transformer (2) is arranged in the shell (4). The connecting assembly (1) comprises a first mounting part (11), a second mounting part (12), a first screw rod (13), a butterfly nut (14) and a conductor (15), wherein one end of the first mounting part (11) and the second mounting part (12) is hingedly connected, one end of the first screw rod (13) is hingedly connected with the first mounting part (11) away from the second mounting part (12), the second mounting part (12) away from the first mounting part (11) is provided with a containing groove (121), the first screw rod (13) is located in the containing groove (121), the butterfly nut (14) is threadedly connected with the first screw rod (13), and the butterfly nut (14) is in contact with the second mounting part (12); the conductor (15) is connected with the first mounting part (11), and the conductor (15) is connected with the current transformer (2) through a wire (21). The mainboard (3) is provided with a processor (31) and a communication module (32), wherein the processor (31) is connected with the current transformer (2), and the communication module (32) is connected with the processor (31).

2. The locomotive zinc oxide arrester monitoring device of claim 1, wherein, The connecting assembly (1) further comprises two elastic sheets (16), a second screw rod (17), a locking plate (18) and a guide column (19), wherein the conductor (15) is an arc-shaped plate, the wire (21) is fixedly connected through the first mounting part (11), the conductor (15) is fixedly connected with the wire (21), the two elastic sheets (16) are fixedly connected with the first mounting part (11), the two elastic sheets (16) are in contact with the conductor (15) to provide elastic force for the conductor (15), the second screw rod (17) passes through the second mounting part (12) and is threadedly connected with the second mounting part (12), one end of the second screw rod (17) close to the first mounting part (11) is rotationally connected with the locking plate (18), the guide column (19) is fixedly connected with the locking plate (18), and the guide column (19) passes through the second mounting part (12) and is slidingly connected with the second mounting part (12).

3. The locomotive zinc oxide arrester monitoring device of claim 1, wherein, One end of the second screw rod (17) away from the locking plate (18) is fixedly connected with a pushing sheet (171).

4. The locomotive zinc oxide arrester monitoring device of claim 3, wherein, The shell (4) has a rectangular cross section, and the shell (4) is provided with a fixing assembly (5) at each corner.

5. The locomotive zinc oxide arrester monitoring device of claim 1, wherein, ​ 6. The locomotive zinc oxide arrester monitoring device of claim 5, wherein, The fixing assembly (5) comprises a mounting plate (51), a tube body (52), a suction cup (53), a suction cup cover (54), a pull rod (56) and an expansion assembly (57); the mounting plate (51) is fixedly connected with the shell (4), the tube body (52) passes through and is fixedly connected with the mounting plate (51), the suction cup cover (54) is fixedly connected with the lower end of the tube body (52), the suction cup (53) is arranged below the suction cup cover (54), and the edge of the suction cup (53) extends out of the suction cup cover (54), the lower end of the pull rod (56) is connected with the suction cup (53), the pull rod (56) is internally provided with a cavity, the expansion assembly (57) is arranged in the cavity, and the expansion assembly (57) can be stretched out of the cavity.

7. The locomotive zinc oxide arrester monitoring device of claim 6, wherein, The expansion assembly (57) comprises two protrusions (571) and a spring (572), the spring (572) is mounted between the two protrusions (571), and the spring (572) provides elastic force for the two protrusions (571) to move away from each other, and a limiting portion (573) is arranged on the two protrusions (571), for preventing the protrusions (571) from being separated from the pull rod (56).

8. The locomotive zinc oxide arrester monitoring device of claim 6, wherein, The fixing assembly (5) further comprises a handle (55) arranged on the upper end of the pull rod (56).

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