Transformer iron core grounding on-line monitoring device

Abstract

The utility model discloses a transformer iron core grounding on-line monitoring device which comprises a shell, the shell comprises an upper shell and a lower shell, the transformer iron core grounding on-line monitoring device further comprises a sealing pipe and a mutual inductor body, the sealing pipe is fixedly arranged in the lower shell, the mutual inductor body is sleeved outside the sealing pipe, a display screen is arranged in the upper shell, and a control unit is arranged in the lower shell. The display screen is in data connection with the control unit, and the mutual inductor body is in data connection with the control unit. According to the transformer iron core grounding on-line monitoring device provided by the utility model, the mutual inductor body is arranged in the shell and is sleeved with the iron core through the sealing pipe, so that the connection between the mutual inductor body and the iron core is completed, and the installation can be completed only by connecting the sealing pipe with the iron core and fixing the shell to a position where the installation is required during the installation; the connection steps between the mutual inductor body and the iron core can be simplified, the installation efficiency is improved, data detected by the mutual inductor body can be transmitted to the control unit and displayed through the display screen, and observation can be facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of current monitoring devices, in particular to an online monitoring device for transformer core grounding. Background Art

[0002] When the transformer is in operation, faults often occur due to poor insulation of the iron core. If the iron core is poorly insulated and a metallic short circuit to ground has not yet formed, a large discharge pulse will be generated, which can be detected by high-frequency signal partial discharge monitoring. The current passing through the transformer core can be monitored by the current monitoring device.

[0003] According to a utility model patent application with publication number CN220584302U and publication date March 12, 2024, a high-voltage transformer core grounding current measurement system is disclosed. The system is configured to measure the core grounding current and includes a current transformer, a digital ammeter, and a DCS system. The current transformer has a central hole and is mounted on the core to detect the core grounding current. The digital ammeter has an input connected to the current transformer and displays the grounding current value. The DCS is connected to the output of the digital ammeter and generates an alarm when the grounding current value exceeds a preset alarm threshold. The system's primary technical advantage is that during operation, the current transformer can detect the grounding current in the high-voltage transformer core in real time and display it on the digital ammeter. The DCS collects and monitors the grounding current data in real time, generating an alarm when the grounding current exceeds the preset alarm threshold. This eliminates the need for personnel to enter the core for on-site testing, achieving the technical advantage of real-time monitoring while ensuring personnel safety.

[0004] The AC transformer and current detection device in the prior art have a split structure. After fixing the current detection device, the AC transformer and the iron core need to be fixed again, which makes the installation cumbersome. At the same time, the AC transformer and the current detection device with a split structure need to be connected with wires. After installation, the wires need to be separately arranged, which is cumbersome. Therefore, a transformer core grounding online monitoring device is proposed to solve the problem of cumbersome installation of the split AC transformer and current detection device in the prior art. Utility Model Content

[0005] The purpose of the utility model is to provide an online monitoring device for transformer core grounding, aiming to solve the problem of complicated installation of split-structure AC transformer and current detection equipment in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A transformer core grounding online monitoring device includes a shell, the shell includes an upper shell and a lower shell, and is characterized in that it also includes a sealing tube and a mutual inductor body, the sealing tube is fixedly arranged inside the lower shell, and the mutual inductor body is sleeved on the outside of the sealing tube, a display screen is provided inside the upper shell, and a control unit is provided inside the lower shell, the display screen maintains a data connection with the control unit, and the mutual inductor body maintains a data connection with the control unit.

[0008] Preferably, a first through hole is opened on the outer wall of one side of the lower shell, and a second through hole is opened on the outer wall of the lower shell relative to the first through hole. The first through hole is concentric with the second through hole, and the diameter of the first through hole is larger than the diameter of the second through hole.

[0009] Preferably, an abutting portion is provided at one end of the sealing tube, a first mounting groove is provided on the outer wall of the abutting portion, and a second mounting groove is provided at the other end of the sealing tube, and a first sealing ring is provided inside both the first mounting groove and the second mounting groove.

[0010] Preferably, it further includes a screen fixing member and a transparent cover plate, a light-transmitting groove is provided on the outer wall of one side of the upper shell, a third mounting groove is provided on the inner wall of one side of the upper shell, a second sealing ring is provided in the third mounting groove, the display screen is fixedly connected to the inside of the upper shell through the screen fixing member, and the transparent cover plate is located between the display screen and the second sealing ring.

[0011] Preferably, a fourth mounting groove is provided on the outer wall of the edge of the upper shell, a third sealing ring is provided inside the third mounting groove, a contact strip is provided on the top surface of the lower shell, and the upper shell and the lower shell are connected by screws so that the contact strip contacts the third sealing ring.

[0012] Preferably, a mounting plate is fixedly installed inside the lower shell, and the transformer body is fixedly installed on the mounting plate.

[0013] In the above technical solution, the utility model provides a transformer core grounding online monitoring device, which has the following beneficial effects:

[0014] In this utility model, the transformer body is installed inside the shell, and the sealing tube is connected to the iron core to complete the connection between the transformer body and the iron core. The steps of installing the transformer body can be simplified. During installation, it is only necessary to connect the sealing tube to the iron core and fix the shell to the position where it needs to be installed. The connection steps between the transformer body and the iron core can be simplified, and the installation efficiency can be improved. At the same time, the data detected by the transformer body can be transmitted to the control unit and displayed on the display screen, which can be easily observed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present utility model;

[0017] Figure 2 A schematic diagram of the three-dimensional structure of the upper shell provided in an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the upper shell assembly structure provided by an embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the internal structure of the lower shell provided by an embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the lower shell assembly structure provided by an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. Outer shell; 11. Upper shell; 111. Light-transmitting slot; 112. Third mounting slot; 114. Fourth mounting slot; 12. Lower shell; 121. First through hole; 122. Second through hole; 123. Abutment strip; 124. Mounting plate; 2. Sealing tube; 21. Abutment portion; 22. First mounting slot; 23. Second mounting slot; 3. Transformer body; 4. Display screen; 5. Control unit; 6. Screen fixing member; 7. Transparent cover. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] See also Figure 1 —5. A transformer core grounding online monitoring device includes a shell 1, which includes an upper shell 11 and a lower shell 12, and also includes a sealed tube 2 and a mutual inductor body 3. The sealed tube 2 is fixedly arranged inside the lower shell 12, and the mutual inductor body 3 is sleeved on the outside of the sealed tube 2. A display screen 4 is provided inside the upper shell 11, and a control unit 5 is provided inside the lower shell 12. The display screen 4 maintains a data connection with the control unit 5, and the mutual inductor body 3 maintains a data connection with the control unit 5.

[0025] Specifically, the housing 1 includes an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are connected by screws. It also includes a sealing tube 2 and a transformer body 3. The sealing tube 2 is arranged inside the transformer body 3, and the transformer body 3 is fixedly installed inside the lower shell 12. The transformer body 3 is connected to the iron core through the sealing tube 2, and the current flowing through the iron core is detected by the transformer body 3. The transformer body 3 maintains a data connection with the control unit 5. The current value detected by the control unit 5 through the transformer body 3 is displayed on the display screen 4 installed inside the upper shell 11, which is convenient for the user to observe.

[0026] In the utility model, the transformer body 3 is installed inside the shell 1, and is connected to the iron core through the sealing tube 2, thereby completing the connection between the transformer body 3 and the iron core, which can simplify the steps of installing the transformer body 3. During installation, it is only necessary to connect the sealing tube 2 to the iron core and fix the shell 1 to the position where it needs to be installed. It can simplify the connection steps between the transformer body 3 and the iron core and improve the installation efficiency. At the same time, the data detected by the transformer body 3 can be transmitted to the control unit 5 and displayed through the display screen 4, which can be easily observed.

[0027] As an embodiment provided by the present utility model, Figure 5 As shown, a first through hole 121 is opened on the outer wall of one side of the lower shell 12. Further, a second through hole 122 is opened on the outer wall of the lower shell 12 relative to the first through hole 121. Preferably, the first through hole 121 is concentric with the second through hole 122, and the diameter of the first through hole 121 is larger than the diameter of the second through hole 122, so that when the sealing tube 2 is inserted into the first through hole 121 and the second through hole 122, one end of the sealing tube 2 can quickly pass through the first through hole 121. Further, as shown Figure 5 As shown, an abutment portion 21 is fixedly provided on the outer wall of one end of the sealing tube 2, a first mounting groove 22 is provided on the circumferential outer wall of the abutment portion 21, and a second mounting groove 23 is provided on the circumferential outer wall of the sealing tube 2 away from the abutment portion 21, and a first sealing ring is provided inside the first mounting groove 22 and the second mounting groove 23. Preferably, the outer diameter of the abutment portion 21 after the first sealing ring is installed is adapted to the inner diameter of the first through hole 121, and the outer diameter of the first sealing ring installed at the other end of the sealing tube 2 is adapted to the inner diameter of the second through hole 122, so that when the sealing tube 2 is inserted into the second through hole 122 through the first through hole 121, the first sealing ring installed at the other end of the sealing tube 2 only contacts the inner wall of the second through hole 122, which can reduce the wear of the first sealing ring at the other end of the sealing tube 2, thereby improving the waterproof effect.

[0028] As an embodiment provided by the present utility model, Figure 2As shown, it also includes a screen fixing member 6 and a transparent cover 7. The transparent cover 7 can be made of a glass cover or acrylic material to ensure that the display screen 4 is not blocked. A light-transmitting groove 111 is opened on the outer wall of one side of the upper shell 11. Figure 3 As shown, a third mounting groove 112 is opened on the inner wall of one side of the upper shell 11, and the third mounting groove 112 is located outside the light-transmitting groove 111. A second sealing ring is fixedly installed inside the third mounting groove 112. The display screen 4 is installed inside the upper shell 11 through the screen fixing member 6. The transparent cover plate 7 is located between the display screen 4 and the second sealing ring. The display screen 4 pushes the transparent cover plate 7 to abut against the second sealing ring, thereby ensuring that the light-transmitting groove 111 and the transparent cover plate 7 are sealed to prevent water leakage.

[0029] As an embodiment provided by the present utility model, Figure 3 and Figure 5 As shown, a fourth mounting groove 114 is provided on the outer wall of the edge of the upper shell 11, a third sealing ring is provided inside the fourth mounting groove 114, and a contact strip 123 is provided on the outer wall of the top of the lower shell 12.

[0030] As a further improvement of the present invention, Figure 3 As shown, the fourth mounting groove 114 is designed as a square groove structure to better accommodate and fix the third sealing ring. The third sealing ring is made of soft and durable material, such as silicone or rubber, to ensure its good sealing performance and durability.

[0031] The shape of the abutment strip 123 matches the fourth mounting groove 114, so that when the upper and lower shells 12 are assembled together, the abutment strip 123 can fit tightly against the third sealing ring, further enhancing the sealing effect. The abutment strip 123 is also made of a material with a certain degree of elasticity and wear resistance to ensure its stability during long-term use.

[0032] Furthermore, the present invention provides positioning between the upper shell 11 and the lower shell 12 via the fourth mounting slot 114 and the abutment bar 123, ensuring precise alignment during assembly. The positioning structure may include positioning holes and positioning posts, which, when combined, allow the upper shell 11 and the lower shell 12 to be quickly and accurately positioned during assembly, improving assembly efficiency.

[0033] Through the above improvements, the sealing performance of the upper shell 11 and the lower shell 12 of the utility model has been significantly improved, which can better prevent impurities such as liquids and dust from entering the interior of the device, ensuring the normal operation and service life of the device. At the same time, the setting of the positioning structure also makes the assembly process simpler and faster, improving production efficiency.

[0034] A mounting plate 124 is fixedly installed inside the lower shell 12 , and the transformer body 3 is fixedly installed on the mounting plate 124 . The mounting plate 124 supports and fixes the transformer body 3 to prevent the transformer body 3 from shaking or tilting, thereby ensuring stable operation of the transformer body 3 .

[0035] The transformer body 3 is connected to the control unit 5 via a connecting line to achieve signal transmission and data exchange.

[0036] Furthermore, the control unit 5 includes a power module and a signal transmission module. The signal transmission module includes a wireless transmission module, a network port module, and a 485 communication module. As the core of the entire system, the control unit 5 not only carries the important task of power supply but also plays a vital role in signal transmission and processing. The signal transmission module serves as a bridge for communication between the control unit 5 and external devices, and its performance is directly related to the communication efficiency and stability of the entire system. The wireless transmission module supports multiple wireless communication protocols, allowing the control unit 5 to flexibly connect with different types of wireless devices, realizing real-time data transmission and sharing. The network port module provides access to a wired network. Through a network cable connection, the control unit can be connected to a local area network or the Internet, facilitating remote data transmission and management. The 485 communication module is a commonly used industrial communication interface. It has characteristics such as long transmission distance and strong anti-interference capabilities, making it particularly suitable for data communication in complex environments such as industrial sites. Through the 485 communication module, the control unit 5 can be connected in series with multiple devices to achieve centralized data collection and processing, improving the system's integration and reliability.

[0037] Specifically, the 485 communication module uses the MAX3485 chip to build the circuit, the network port module uses the W5500 Ethernet control chip to build the circuit, and the wireless communication module uses the EC800M communication chip to build the circuit. It can be used in high-speed rail or motor train scenarios, enabling convenient data transmission.

[0038] Those skilled in the art will appreciate that other similar connection methods can also implement the present invention, such as welding, bonding, or screwing.

[0039] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A transformer core grounding online monitoring device, comprising a housing (1), wherein the housing (1) comprises an upper housing (11) and a lower housing (12), characterized in that: The invention also includes a sealing tube (2) and a mutual inductor body (3), wherein the sealing tube (2) is fixedly arranged inside the lower shell (12), and the mutual inductor body (3) is sleeved on the outside of the sealing tube (2). A display screen (4) is arranged inside the upper shell (11), and a control unit (5) is arranged inside the lower shell (12). The display screen (4) maintains a data connection with the control unit (5), and the mutual inductor body (3) maintains a data connection with the control unit (5).

2. The transformer core grounding online monitoring device according to claim 1, characterized in that: A first through hole (121) is provided on the outer wall of one side of the lower shell (12), and a second through hole (122) is provided on the outer wall of the lower shell (12) opposite to the first through hole (121). The first through hole (121) and the second through hole (122) are concentric, and the diameter of the first through hole (121) is larger than the diameter of the second through hole (122).

3. The transformer core grounding online monitoring device according to claim 2, characterized in that: One end of the sealing tube (2) is provided with an abutting portion (21), an outer wall of the abutting portion (21) is provided with a first mounting groove (22), and the other end of the sealing tube (2) is provided with a second mounting groove (23), and first sealing rings are provided inside the first mounting groove (22) and the second mounting groove (23).

4. The transformer core grounding online monitoring device according to claim 1, characterized in that: The device further comprises a screen fixing member (6) and a transparent cover plate (7); a light-transmitting groove (111) is provided on the outer wall of one side of the upper shell (11); a third mounting groove (112) is provided on the inner wall of one side of the upper shell (11); a second sealing ring is provided in the third mounting groove (112); the display screen (4) is fixedly connected to the interior of the upper shell (11) via the screen fixing member (6); and the transparent cover plate (7) is located between the display screen (4) and the second sealing ring.

5. The transformer core grounding online monitoring device according to claim 4, characterized in that: A fourth mounting groove (114) is provided on the outer wall of the edge of the upper shell (11), a third sealing ring is provided inside the third mounting groove (112), and an abutting strip (123) is provided on the top surface of the lower shell (12). The upper shell (11) and the lower shell (12) are connected by screws so that the abutting strip (123) abuts against the third sealing ring.

6. The transformer core grounding online monitoring device according to claim 1, characterized in that: A mounting plate (124) is fixedly mounted inside the lower shell (12), and the mutual inductor body (3) is fixedly mounted on the mounting plate (124).

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