An on-line monitoring system for partial discharge of transformer bushings

Abstract

The utility model relates to an online monitoring system for partial discharge of transformer bushing, including temperature and pressure integrated sensor, hydrogen sensor, laser liquid level sensor, data analysis processing device and power supply device, temperature and pressure integrated sensor, hydrogen sensor and laser liquid level sensor's data output all with data analysis processing device communication connection, temperature and pressure integrated sensor, hydrogen sensor and laser liquid level sensor's electric input and power supply device electricity are connected, temperature and pressure integrated sensor, hydrogen sensor and laser liquid level sensor all set up in the upper end of respiratory cavity, and at least hydrogen sensor with laser liquid level sensor set up on the top wall of respiratory cavity, laser point of laser liquid level sensor is located the radial outside of pressure spring, the electric input of data analysis processing device with power supply device electricity is connected, has the advantages such as simplifying system structure, reducing system implementation difficulty and realizing accurate monitoring.

Description

Technical Field

[0001] This utility model relates to the technical field of fault monitoring of transformer high-voltage bushings, and in particular to an online monitoring system for partial discharge of transformer bushings. Background Technology

[0002] Most high-voltage transformer bushings are oil-paper capacitor bushings. When partial discharge occurs due to insulation defects, the oil-paper insulation material decomposes and produces characteristic gases, mainly including hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO), and carbon dioxide (CO2). Among these, the main characteristic gases are H2, CH4, and CO, and H2 accounts for a much larger volume fraction than the other characteristic gases. Therefore, online monitoring of the total amount of gases (especially H2), the amount of gas produced, and the hydrogen concentration can directly reflect the fault status of the bushing.

[0003] Current methods for detecting bushing discharge faults typically involve detecting ionized gas in the transformer bushing. The specific operation process usually involves using a pump to extract the oil-gas mixture from the oil tank breathing chamber to an oil-gas separation module. After oil-gas separation in the module, the gas is detected, and the insulating oil is then reintroduced into the bushing. The entire detection system has a complex structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects in the prior art, thereby providing an online monitoring system for partial discharge of transformer bushings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An online monitoring system for partial discharge in transformer bushings, wherein the transformer bushing includes an oil conservator, a conductive rod, and a pressure spring;

[0007] A breathing chamber is formed inside the oil reservoir. One end of the conductive rod passes through the oil reservoir, and one end of the pressure spring is fixed to the bottom wall of the breathing chamber. The pressure spring is arranged around the conductive rod.

[0008] The online monitoring system includes a temperature and pressure integrated sensor, a hydrogen sensor, a laser level sensor, a data analysis and processing device, and a power supply device.

[0009] The data output terminals of the integrated temperature and pressure sensor, the hydrogen sensor, and the laser liquid level sensor are all communicatively connected to the data analysis and processing device.

[0010] The electrical input terminals of the integrated temperature and pressure sensor, the hydrogen sensor, and the laser liquid level sensor are electrically connected to the power supply device.

[0011] The integrated temperature and pressure sensor, the hydrogen sensor, and the laser liquid level sensor are all disposed at the upper end of the breathing chamber, and at least the hydrogen sensor and the laser liquid level sensor are disposed on the top wall of the breathing chamber.

[0012] The laser spot of the laser level sensor is located radially outside the pressure spring.

[0013] The electrical input terminal of the data analysis and processing device is electrically connected to the power supply device.

[0014] Preferably, the power supply device includes a CT power extraction module, a power transmission line, and a power conversion module;

[0015] The CT power supply module is wound around the end of the conductive rod that extends out of the oil reservoir, and is fixedly connected to the oil reservoir through a support base;

[0016] One end of the power transmission line is electrically connected to the CT power supply module, and the other end is electrically connected to the power conversion module;

[0017] The output of the power conversion module is electrically connected to the integrated temperature and pressure sensor, the hydrogen sensor, the laser level sensor, and the data analysis and processing device.

[0018] Preferably, it also includes electrical connectors, which include a first power supply and data transmission line, a second power supply and data transmission line, a third power supply and data transmission line, a through-wall sealed connector, a communication transmission line, and a power supply line;

[0019] The through-wall sealing connector is sealed and installed on the side wall of the oil tank;

[0020] One side of the through-wall sealed connector is electrically connected to the integrated temperature and pressure sensor, the hydrogen sensor, and the laser liquid level sensor via the first power supply and data transmission line, the second power supply and data transmission line, and the third power supply and data transmission line, respectively; the other side is electrically connected to the data analysis and processing device and the power supply device via the communication transmission line and the power supply line, respectively.

[0021] Preferably, the through-wall sealing connector includes a through-wall socket and plugs located on both sides of the through-wall socket;

[0022] Both the wall socket and the plug are made of stainless steel.

[0023] The wall socket adopts a glass sintering sealing process;

[0024] The wall socket and the oil reservoir are fixedly connected by vacuum welding.

[0025] Preferably, the data analysis and processing device includes a filter amplifier circuit, an A / D conversion chip, and a processor;

[0026] The input and output terminals of the A / D conversion chip are electrically connected to the filter amplifier circuit and the processor, respectively.

[0027] The input terminal of the filter amplifier circuit is electrically connected to the integrated temperature and pressure sensor, the hydrogen sensor, and the laser level sensor.

[0028] Preferably, it further includes a first housing fixed to the outer wall of the oil reservoir;

[0029] The data analysis and processing device and the power supply device are partially installed inside the first enclosure.

[0030] Preferably, the upper end of the oil pillow is provided with an opening connecting the external space and the breathing chamber;

[0031] The opening is covered with a first pressure cap, and a second pressure cap is provided on the side of the first pressure cap away from the opening;

[0032] The hydrogen sensor and the laser liquid level sensor are installed on the side of the first pressure cap facing the opening;

[0033] The power supply device is installed on the side of the second cover away from the first cover.

[0034] Preferably, it also includes a data transfer device and an on-site early warning device;

[0035] The data transfer device and the local early warning device are integrated into one unit and installed on the transformer mounting surface;

[0036] The input terminal of the data transfer device is electrically connected to the data analysis and processing device via a fourth power supply and data transmission line, and the output terminal of the data transfer device is electrically connected to the local early warning device.

[0037] Preferably, the local early warning device includes a display and an alarm.

[0038] Preferably, the device further includes a terminal device, which interacts with the data transfer device via LoRa wireless communication.

[0039] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0040] This invention provides an online monitoring system for partial discharge in transformer bushings. By placing an integrated temperature and pressure sensor, a hydrogen sensor, and a laser level sensor at the upper end of the breathing chamber, it can monitor the hydrogen content, gas temperature, gas pressure, and oil level within the breathing chamber in real time. This effectively monitors the partial discharge status of the transformer bushings. Furthermore, it simplifies the system structure and reduces the difficulty of system implementation. In addition, the laser point position of the laser level sensor effectively avoids the locations of the conductive rod and pressure spring, further optimizing the accuracy of data acquisition. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of one example of the structure of this system.

[0043] Figure 2 for Figure 1 A partial schematic diagram.

[0044] Figure 3 for Figure 2 An enlarged diagram of position D in the middle.

[0045] Figure 4 This is a block diagram of the system.

[0046] Explanation of reference numerals in the attached figures:

[0047] 100. Oil pillow; 101. Breathing chamber; 102. Opening; 103. First pressure cap; 104. Second pressure cap; 200. Conductive rod; 300. Pressure spring; 400. Ceramic sleeve; 1. Integrated temperature and pressure sensor; 2. Hydrogen sensor; 3. Laser liquid level sensor; 4. Data analysis and processing device; 5. Power supply device; 50. Support base; 51. CT power supply module; 52. Power transmission line; 53. Power conversion module; 6. Electrical connector; 61. First power supply and data transmission line; 62. Second power supply and data transmission line; 63. Third power supply and data transmission line; 64. Through-wall sealing connector; 65. Communication transmission line; 66. Power supply line; 7. First enclosure; 8. Data transfer device; 81. Fourth power supply and data transmission line; 9. Local early warning device; 10. Terminal equipment. Detailed Implementation

[0048] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] See Figures 1 to 4 This utility model provides an online monitoring system for partial discharge of transformer bushings. The transformer bushing includes an oil conservator 100, a conductive rod 200, and a pressure spring 300. A breathing chamber 101 is formed within the oil conservator 100. One end of the conductive rod 200 penetrates the oil conservator 100, and one end of the pressure spring 300 is fixed to the bottom wall of the breathing chamber 101, with the pressure spring 300 surrounding the conductive rod 200. A porcelain sleeve 400 is provided at the lower end of the oil conservator 100, and the lower end of the porcelain sleeve 400 is configured as a transformer.

[0052] The aforementioned online monitoring system includes a temperature and pressure integrated sensor 1, a hydrogen sensor 2, a laser level sensor 3, a data analysis and processing device 4, and a power supply device 5. The data output terminals of the temperature and pressure integrated sensor 1, hydrogen sensor 2, and laser level sensor 3 are all communicatively connected to the data analysis and processing device 4. The electrical input terminals of the temperature and pressure integrated sensor 1, hydrogen sensor 2, and laser level sensor 3 are electrically connected to the power supply device 5. The temperature and pressure integrated sensor 1, hydrogen sensor 2, and laser level sensor 3 are all located at the upper end of the breathing chamber 101, with at least hydrogen sensor 2 and laser level sensor 3 located on the top wall of the breathing chamber 101. The laser point of the laser level sensor 3 is located radially outside the pressure spring 300. The electrical input terminal of the data analysis and processing device 4 is electrically connected to the power supply device 5.

[0053] It is easy to understand that in the above solution, by placing the integrated temperature and pressure sensor 1, the hydrogen sensor 2, and the laser level sensor 3 at the upper end of the breathing chamber 101, the hydrogen content, gas temperature, gas pressure, and oil level within the breathing chamber 101 can be monitored in real time. This allows for effective monitoring of partial discharge in the transformer bushings. Simultaneously, it simplifies the system structure and reduces the difficulty of system implementation. Furthermore, the laser point position of the laser level sensor 3 effectively avoids the positions of the conductive rod 200 and the pressure spring 300, further optimizing the accuracy of data acquisition.

[0054] Specifically, the power supply device 5 includes a CT power extraction module 51, a power transmission line 52, and a power conversion module 53; wherein, the CT power extraction module 51 is wound around one end of the conductive rod 200 extending out of the oil tank 100, and is fixedly connected to the oil tank 100 through a support base 50; one end of the power transmission line 52 is electrically connected to the CT power extraction module 51, and the other end is electrically connected to the power conversion module 53; the output end of the power conversion module 53 is electrically connected to the integrated temperature and pressure sensor 1, the hydrogen sensor 2, the laser liquid level sensor 3, and the data analysis and processing device 4.

[0055] It is easy to understand that, based on the principle of electromagnetic induction, when the transformer bushing is running, the conductive rod 200 carries an alternating current, and the CT power-taking module 51 is wound around the end of the conductive rod 200 that extends out of the oil tank 100. The CT power-taking module 51 can generate an induced current and input it to the power conversion module 53. The power conversion module 53 outputs a direct current and supplies it to the temperature and pressure integrated sensor 1, the hydrogen sensor 2, the laser liquid level sensor 3, and the data analysis and processing device 4. This enables the system to be self-powered, reduces the system's dependence on external power sources, and improves the system's flexibility and reliability.

[0056] See Figures 1 to 4The aforementioned online monitoring system also includes an electrical connector 6, which comprises a first power supply and data transmission line 61, a second power supply and data transmission line 62, a third power supply and data transmission line 63, a through-wall sealed connector 64, a communication transmission line 65, and a power supply line 66. The through-wall sealed connector 64 is sealed and installed on the side wall of the oil tank 100. One side of the through-wall sealed connector 64 is electrically connected to the integrated temperature and pressure sensor 1, the hydrogen sensor 2, and the laser liquid level sensor 3 via the first power supply and data transmission line 61, the second power supply and data transmission line 62, and the third power supply and data transmission line 63, respectively. The other side is electrically connected to the data analysis and processing device 4 and the power supply device 5 via the communication transmission line 65 and the power supply line 66, respectively.

[0057] It is easy to understand that the power supply device 5 supplies power to the integrated temperature and pressure sensor 1 via power supply line 66, through-wall sealing connector 64, and first power supply and data transmission line 61, enabling the integrated temperature and pressure sensor 1 to acquire the gas temperature and gas pressure within the breathing chamber 101. The power supply device 5 also supplies power to the hydrogen sensor 2 via power supply line 66, through-wall sealing connector 64, and second power supply and data transmission line 62, enabling the hydrogen sensor 2 to acquire the hydrogen content within the breathing chamber 101. The power supply device 5 can also supply power to the laser level sensor 3 via power supply line 66, through-wall sealing connector 64, and third power supply and data transmission line 63, enabling the laser level sensor 3 to acquire the oil level within the breathing chamber 101. Furthermore, the gas temperature and gas pressure data acquired by the integrated temperature and pressure sensor 1 can be transmitted to the data analysis and processing device 4 for analysis and processing via the first power supply and data transmission line 61, through-wall sealing connector 64, and communication transmission line 65. The hydrogen content acquired by the hydrogen sensor 2 can be transmitted to the data analysis and processing device 4 for analysis and processing via the second power supply and data transmission line 62, the through-wall sealed connector 64, and the communication transmission line 65. The oil level data acquired by the laser level sensor 3 can be transmitted to the data analysis and processing device 4 for analysis and processing via the third power supply and data transmission line 63, the through-wall sealed connector 64, and the communication transmission line 65.

[0058] It is worth noting that the electrical connector 6 enables the power supply device 5 to power the integrated temperature and pressure sensor 1, hydrogen sensor 2, and laser level sensor 3, and to transmit data between the integrated temperature and pressure sensor 1, hydrogen sensor 2, and laser level sensor 3 and the data analysis and processing device 4. It also significantly shortens the electrical distance, avoids the complexity of system wiring, improves the system integration, ensures the stability and security of data transmission, avoids wiring problems caused by environmental factors, and ensures the sealing of the breathing chamber 101.

[0059] Specifically, the through-wall sealed connector 64 includes a through-wall socket and plugs located on both sides of the through-wall socket; both the through-wall socket and the plugs are made of stainless steel.

[0060] Furthermore, to ensure airtightness, the through-wall socket uses a glass sintering sealing process.

[0061] Furthermore, the wall socket and the oil reservoir 100 are fixedly connected using a vacuum welding process. Specifically, a hole can be made in the side wall of the oil reservoir 100, and then the wall socket can be welded to the hole in the oil reservoir 100 using a vacuum welding process to ensure that the inside of the breathing chamber 101 can maintain a vacuum state.

[0062] See Figures 1 to 4 The data analysis and processing device 4 includes a filter amplifier circuit, an A / D conversion chip, and a processor; the input and output terminals of the A / D conversion chip are electrically connected to the filter amplifier circuit and the processor, respectively; the input terminal of the filter amplifier circuit is electrically connected to the integrated temperature and pressure sensor 1, the hydrogen sensor 2, and the laser liquid level sensor 3.

[0063] See Figures 1 to 4 It also includes a first housing 7 fixed to the outer wall of the oil tank 100. The first housing 7 can be fixed to the oil tank 100 by welding. The data analysis and processing device 4 and a part of the power supply device 5 (specifically the power conversion module 53) are installed in the first housing 7. The through-wall sealing connector 64 is connected between the breathing chamber 101 and the inner cavity of the first housing 7 to facilitate the wiring of the first power supply and data transmission line 61, the second power supply and data transmission line 62, the third power supply and data transmission line 63, the communication transmission line 65 and the power supply line 66.

[0064] See Figures 1 to 4 The oil pillow 100 has an opening 102 at its upper end that connects to the external space and the breathing chamber 101; a first pressure cover 103 is provided at the opening 102, and a second pressure cover 104 is provided on the side of the first pressure cover 103 away from the opening 102; a hydrogen sensor 2 and a laser liquid level sensor 3 are installed on the end face of the first pressure cover 103 facing the opening 102; a power supply device 5 (specifically a CT power supply module 51 connected through a support base 50) is installed on the side of the second pressure cover 104 away from the first pressure cover 103.

[0065] Specifically, the temperature and pressure integrated sensor 1 is fixedly installed on the side wall of the breathing chamber 101 (e.g., by bonding, or by fasteners such as screws and brackets), while the hydrogen sensor 2 and the laser liquid level sensor 3 can be installed on the first pressure cover 103 by fasteners such as brackets, bolts, and screws.

[0066] See Figures 1 to 4It also includes a data transfer device 8 and a local early warning device 9; wherein, the data transfer device 8 and the local early warning device 9 are integrated into one unit and installed on the installation surface of the transformer; the input end of the data transfer device 8 is electrically connected to the data analysis and processing device 4 through the fourth power supply and data transmission line 81, and the output end of the data transfer device 8 is electrically connected to the local early warning device 9.

[0067] Furthermore, the local early warning device 9 includes a display and an alarm.

[0068] Furthermore, it also includes terminal device 10, which interacts with data transfer device 8 via LoRa wireless communication.

[0069] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An online monitoring system for partial discharge of a transformer bushing, the transformer bushing comprising an oil pillow (100), a conductive rod (200) and a pressure spring (300); a breathing cavity (101) is formed in the oil pillow (100), the conductive rod (200) penetrates the oil pillow (100) at one end, and the pressure spring (300) is fixed to the bottom wall of the breathing cavity (101) at one end, and the pressure spring (300) is arranged around the conductive rod (200); characterized in that the online monitoring system comprises a temperature and pressure integrated sensor (1), a hydrogen sensor (2), a laser liquid level sensor (3), a data analysis and processing device (4) and a power supply device (5); the data output ends of the temperature and pressure integrated sensor (1), the hydrogen sensor (2) and the laser liquid level sensor (3) are in communication connection with the data analysis and processing device (4); the electric input ends of the temperature and pressure integrated sensor (1), the hydrogen sensor (2) and the laser liquid level sensor (3) are in electrical connection with the power supply device (5); the temperature and pressure integrated sensor (1), the hydrogen sensor (2) and the laser liquid level sensor (3) are arranged at the upper end of the breathing cavity (101), and at least the hydrogen sensor (2) and the laser liquid level sensor (3) are arranged on the top wall of the breathing cavity (101); the laser point of the laser liquid level sensor (3) is located radially outside the pressure spring (300); the electric input end of the data analysis and processing device (4) is in electrical connection with the power supply device (5).

2. The on-line monitoring system for partial discharge of transformer bushings according to claim 1, characterized in that, the power supply device (5) comprises a CT power taking module (51), an electric energy transmission line (52) and a power conversion module (53); the CT power taking module (51) is arranged around the end of the conductive rod (200) protruding out of the oil pillow (100), and is fixedly connected with the oil pillow (100) through a support seat (50); one end of the electric energy transmission line (52) is in electrical connection with the CT power taking module (51), and the other end is in electrical connection with the power conversion module (53); the output end of the power conversion module (53) is in electrical connection with the temperature and pressure integrated sensor (1), the hydrogen sensor (2), the laser liquid level sensor (3) and the data analysis and processing device (4).

3. The on-line monitoring system for partial discharge of transformer bushings according to claim 2, characterized in that, It also comprises an electrical connector (6), which comprises a first power supply and data transmission line (61), a second power supply and data transmission line (62), a third power supply and data transmission line (63), a wall-mounted sealed connector (64), a communication transmission line (65) and a power supply line (66); the wall-mounted sealed connector (64) is sealingly mounted on the side wall of the oil pillow (100); The through-wall sealing connector (64) is electrically connected with the temperature and pressure integrated sensor (1), the hydrogen sensor (2) and the laser liquid level sensor (3) on one side through the first power supply and data transmission line (61), the second power supply and data transmission line (62) and the third power supply and data transmission line (63) respectively; and is electrically connected with the data analysis and processing device (4) and the power supply device (5) on the other side through the communication transmission line (65) and the power supply line (66) respectively.

4. The on-line monitoring system for partial discharge of transformer bushings according to claim 3, characterized in that, The through-wall sealing connector (64) comprises a through-wall socket and plugs on both sides of the through-wall socket; The through-wall socket and the plug are made of stainless steel; The through-wall socket is sealed by a glass sintering process; The through-wall socket and the oil pillow (100) are fixedly connected by a vacuum welding process.

5. The on-line monitoring system for partial discharge of transformer bushings according to claim 1, characterized in that, The data analysis and processing device (4) comprises a filter amplification circuit, an A / D conversion chip and a processor; The input end and the output end of the A / D conversion chip are electrically connected with the filter amplification circuit and the processor respectively; The input end of the filter amplification circuit is electrically connected with the temperature and pressure integrated sensor (1), the hydrogen sensor (2) and the laser liquid level sensor (3).

6. The on-line monitoring system for partial discharge of transformer bushings according to any one of claims 1-5, characterized in that, A first box (7) is further arranged on the outer wall of the oil pillow (100); The data analysis and processing device (4) and part of the power supply device (5) are installed in the first box (7).

7. The on-line monitoring system for partial discharge of transformer bushings according to any one of claims 1-5, characterized in that, An opening (102) is arranged on the upper end of the oil pillow (100) and communicates with the breathing cavity (101) and the outside space; A first gland (103) is arranged on the opening (102), and a second gland (104) is arranged on the side of the first gland (103) away from the opening (102); The hydrogen sensor (2) and the laser liquid level sensor (3) are installed on the side end face of the first gland (103) facing the opening (102); The power supply device (5) is installed on the side of the second gland (104) away from the first gland (103).

8. The on-line monitoring system for partial discharge of transformer bushings according to claim 1, characterized in that, A data storage device (8) and an on-site early warning device (9) are further arranged; The data storage device (8) and the on-site early warning device (9) are integrated and installed on the mounting surface of the transformer; The input end of the data storage device (8) is electrically connected with the data analysis and processing device (4) through a fourth power supply and data transmission line (81), and the output end of the data storage device (8) is electrically connected with the on-site early warning device (9).

9. The on-line monitoring system for partial discharge of transformer bushings according to claim 8, characterized in that, The on-site early warning device (9) comprises a display and an alarm.

10. The on-line monitoring system for partial discharge of transformer bushings according to claim 8, characterized in that, A terminal device (10) is further arranged, and the terminal device (10) realizes data interaction with the data storage device (8) through LoRa wireless communication.

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