WAPI-based integrated ultrasonic partial discharge monitoring device

Abstract

The utility model belongs to the technical field of electric power protection detection, and specifically relates to an integrated ultrasonic partial discharge monitoring device based on WAPI. The device comprises a mainboard, a wireless antenna, an ultrasonic sensor, a spring, a shell, an upper cover and a shell bottom plate, the upper cover and the shell bottom plate are fixedly connected with the top and the bottom of the shell respectively, the wireless antenna is installed on the side wall of the shell, the mainboard is fixedly connected to the inner side of the upper cover, and the ultrasonic sensor is installed on the inner side of the shell bottom plate; the upper portion of the ultrasonic sensor makes contact with the bottom end of a spring, the spring and the ultrasonic sensor are arranged in a locking structure, the top end of the spring makes contact with the top face in the locking structure, the bottom of the locking structure is fixed to the inner side of a bottom plate of the shell, and an amplification plate and a power panel are fixed to the two sides of the locking structure respectively. By adopting the monitoring device provided by the utility model, monitoring data can be accurate and timely, judgment and analysis are accurate, cable transmission is reduced, and the monitoring device is safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of power protection detection, and in particular to an integrated ultrasonic partial discharge monitoring device based on WAPI. Background Art

[0002] As one of the main equipment in the power system, the performance status of power transformers is increasingly valued in the power industry. As an important component of the power system, the normal operation of power transformers is related to whether the entire power grid can operate safely and stably. Once a transformer fails, it will cause a large-scale power outage, which will also cause huge losses to the economy. According to research statistics, partial discharge has become one of the main causes of transformer failure. Once partial discharge occurs in a transformer, it is very likely to cause premature damage to the transformer, which not only affects its service life, but also directly affects whether the area can be powered normally. Therefore, it is very important to carry out partial discharge detection on the transformer, and detecting partial discharge of the transformer has also become an important measure to ensure its safe and reliable operation.

[0003] Partial discharge monitoring usually uses acoustic emission sensors to place multiple points on the monitored equipment, and then collects sensor data through a collection device, which is then processed and transmitted to the server through wired communication. Currently, most monitoring devices on the market install sensors on the surface of the equipment being tested and then transmit them to the collection device through cables, which then transmits the data to the system server through cables. Therefore, there are the following problems: 1) The on-site installation is complicated, the cables are complicated, and the engineering workload is large; 2) The acoustic emission sensors and the collection device are scattered and far away, resulting in unstable sensor perception data transmission; 3) Problems such as electromagnetic interference in physical transmission paths such as cables. Summary of the invention

[0004] The purpose of the utility model is to solve the problem that the partial discharge monitoring device in the prior art will cause unstable data transmission and complicated on-site installation due to complicated cables, so an integrated ultrasonic partial discharge monitoring device based on WAPI is proposed. The partial discharge monitoring device has an acoustic emission sensor built into the bottom of the acquisition device, which can make the monitoring data accurate and timely, and the judgment and analysis are accurate. At the same time, through wireless WAPI communication, cable transmission is reduced, which is safe and reliable.

[0005] The utility model proposes an integrated ultrasonic partial discharge monitoring device based on WAPI, which comprises a mainboard, a wireless antenna, an ultrasonic sensor, a spring, a shell, an upper cover and a shell bottom plate which are respectively fixedly connected to the top and bottom of the shell, wherein a wireless antenna is installed on the outer wall of the shell, a mainboard is fixedly connected to the inner side of the upper cover, and an ultrasonic sensor is installed on the inner side of the shell bottom plate; the upper part of the ultrasonic sensor contacts the bottom end of the spring, the spring and the ultrasonic sensor are placed inside a locking structure, the top end of the spring contacts the top surface inside the locking structure, the bottom of the locking structure is fixed on the inner side of the shell bottom plate, and an amplifier board and a power supply board are respectively fixed on both sides of the locking structure; a power signal output end of the power supply board is respectively connected to a power signal input end of the amplifier board and a power signal input end of the mainboard, an ultrasonic signal output end of the ultrasonic sensor is connected to an ultrasonic signal input end of the amplifier board, an amplified ultrasonic signal output end of the amplifier board is connected to an amplified ultrasonic signal input end of the mainboard, and an amplified ultrasonic signal output end of the mainboard is connected to a signal input end of the wireless antenna.

[0006] Preferably, a magnet is disposed on the outer side of the housing bottom plate.

[0007] Preferably, an indicator light board is arranged on the inner side of the upper cover, and a signal input end of the indicator light board is connected to an indicator light signal output end of the main board.

[0008] Preferably, the shell bottom plate is made of an epoxy plate with a thermal conductivity of 0.2-0.5 W / (m·°C).

[0009] Preferably, the shell is made of aluminum alloy with a thermal conductivity of 200-260 W / (m·°C).

[0010] Preferably, the ultrasonic sensor is installed at the middle of the inner side of the housing bottom plate.

[0011] Preferably, the wireless antenna is fixedly mounted on the outer side wall of the housing by means of a nut.

[0012] Preferably, the wireless antenna is a two-in-one waterproof antenna of WAPI and GPS, in the form of a mushroom head.

[0013] The integrated ultrasonic partial discharge monitoring device based on WAPI described in the utility model has at least the following beneficial effects:

[0014] (1) In the present invention, the acoustic emission sensor (ultrasonic sensor) is built into the bottom of the acquisition device, that is, the acoustic emission sensor and the acquisition device are designed in an integrated manner, which can avoid the defect of unstable sensor data transmission, so that the monitoring data is accurate and timely, and the judgment and analysis are accurate. At the same time, by adopting wireless WAPI communication, cable transmission can be reduced, which is safe and reliable, and the engineering workload is small;

[0015] (2) In the preferred case, the bottom plate of the shell is made of epoxy board with low thermal conductivity, so as to minimize the influence of the heating of the measured object on the equipment. At the same time, the bottom plate of the shell is inlaid with high-temperature resistant strong magnets, which is convenient for adsorption and installation, and is conducive to engineering construction;

[0016] (3) The integrated waterproof housing of the utility model is made of high thermal conductivity aluminum alloy, which makes the equipment light and can accelerate the heat dissipation. The comprehensive structure design of heat insulation and heat dissipation has a better monitoring environment and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded diagram of an integrated ultrasonic partial discharge monitoring device based on WAPI in the utility model;

[0018] Figure 2 It is a partial schematic diagram of the ultrasonic sensor and the locking structure in the utility model;

[0019] Figure 3 This is a schematic diagram of the main structure of an integrated ultrasonic partial discharge monitoring device based on WAPI in the utility model;

[0020] Figure 4 This is a circuit diagram of an integrated ultrasonic partial discharge monitoring device based on WAPI in the utility model;

[0021] Figure 5 The utility model is a schematic diagram of a circuit communication system of an integrated ultrasonic partial discharge monitoring device based on WAPI.

[0022] Description of Reference Numerals

[0023] 1. Upper cover; 2. Indicator light board; 3. Main board; 4. Amplifier board; 5. Wireless antenna; 6. Shell bottom plate; 7. Power board; 8. Locking structure; 9. Spring; 10. Ultrasonic sensor; 11. Shell; 12. Magnet. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0025] This utility model proposes an integrated ultrasonic partial discharge monitoring device based on WAPI, such as Figure 1-3As shown, the integrated ultrasonic partial discharge monitoring device includes a main board 3, a wireless antenna 5, an ultrasonic sensor 10, a spring 9, a shell 11, an upper cover 1 and a shell bottom plate 6 respectively fixedly connected to the top and bottom of the shell 11, a wireless antenna 5 is installed on the outer wall of the shell 11, the inner side of the upper cover 1 is fixedly connected to the main board 3, and the inner side of the shell bottom plate 6 is installed with an ultrasonic sensor 10; the upper part of the ultrasonic sensor 10 contacts the bottom end of the spring 9, the spring 9 and the ultrasonic sensor 10 are placed inside the locking structure 8, the top end of the spring 9 contacts the top surface inside the locking structure 8, the bottom of the locking structure 8 is fixed to the inner side of the shell bottom plate 6, and the two sides of the locking structure 8 are respectively fixed with an amplifier board 4 and a power supply board 7; the circuit diagram of the partial discharge monitoring device is shown in FIG. Figure 4 As shown, the power signal output end of the power board 7 is respectively connected to the power signal input end of the amplifier board 4 and the power signal input end of the main board 3, the ultrasonic signal output end of the ultrasonic sensor 10 is connected to the ultrasonic signal input end of the amplifier board 4, the amplified ultrasonic signal output end of the amplifier board 4 is connected to the amplified ultrasonic signal input end of the main board 3, and the amplified ultrasonic signal output end of the main board 3 is connected to the signal input end of the wireless antenna 5.

[0026] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific embodiment, the housing 11 is an integrated waterproof housing. In a preferred embodiment, the housing 11 is made of aluminum alloy with a thermal conductivity of 200-260W / (m·℃), so that the device is light and can accelerate heat dissipation. In a more preferred embodiment, the aluminum alloy material used in the housing 11 has a protection level of IP65, which can prevent electromagnetic interference and provide protection and installation for the collection device.

[0027] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, an indicator light board 2 is bonded to the inner side of the upper cover 1, and the signal input end of the indicator light board 2 is connected to the indicator light signal output end of the main board 3, which is used to display whether the power supply, communication, operation status, and synchronization status are normal.

[0028] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, a magnet 12 is embedded on the outer side of the shell bottom plate 6. Specifically, the magnet is a high-temperature resistant strong magnet, which has the advantages of strong magnetic force, not easy to slip, convenient adsorption and installation, and can withstand high temperatures of 150°C without demagnetization.

[0029] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the shell bottom plate 6 is made of an epoxy board with a thermal conductivity of 0.2-0.5W / (m·℃), which can minimize the impact of the heating of the object being measured on the equipment.

[0030] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the wireless antenna 5 is fixedly mounted on the outer side wall of the housing 11 by a nut.

[0031] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation manner, the wireless antenna 5 is a two-in-one waterproof antenna of WAPI and GPS. Through wireless WAPI and GPS communication, cable transmission can be reduced, and the defect of unstable sensor perception data transmission can be avoided, so that the monitoring data is accurate and timely, and the judgment and analysis are accurate. It adopts a mushroom head form, the product has a small size, light weight, a wide range of application scenarios, and strong adaptability. Specifically, the wireless antenna 5 is a WIFI+GPS two-in-one antenna, purchased from Shengda Communication, and the model is WIFI+GPS [two-in-one] / IPEX (1st generation).

[0032] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the mainboard 3 uses FPGA technology to perform logical processing and editing on the collected data. Specifically, the mainboard 3 is an ultrasonic wireless function board, purchased from E-Electric Technology, and the model is ED_AE-WAPI_FUN_VER 1.1.

[0033] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific embodiment, the ultrasonic sensor 10 is installed in the middle of the inner side of the shell bottom plate 6. Specifically, a stepped circular groove is provided in the middle of the inner side of the shell bottom plate 6, and the ultrasonic sensor 10 is installed in the stepped circular groove. The stepped circular groove provides support for the sensor, and the vertical direction is limited by the joint of the ultrasonic sensor 10 itself so that it will not fall off from the inside of the device. At the same time, the locking structure 8 presses the ultrasonic sensor 10, and the sensor of the uninstalled monitoring device has a 3mm moving space in the vertical direction protruding from the shell bottom plate 6. When the integrated ultrasonic partial discharge monitoring device in the present invention is adsorbed on the surface of the measured device, the ultrasonic sensor 10 moves to the inside of the integrated ultrasonic partial discharge monitoring device and is further compressed by a strong spring. The advantages are: 1. Reasonable layout to minimize the volume of the device; 2. The sensor is compressed after protruding to make the detection surface more closely contact with the surface of the measured device; 3. The ultrasonic sensor 10 is installed in the middle of the inner side of the shell bottom plate 6 to make the force more uniform.

[0034] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the ultrasonic sensor 10 is an acoustic emission sensor element, and its frequency range is 60-400KHz, which can accurately identify fault signals.

[0035] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the spring 9 is a strong spring. The advantage of using a strong spring is that the sensor detection surface can be squeezed by the strong spring to make it more closely contact with the surface of the device under test, thereby improving the monitoring accuracy.

[0036] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the locking structure 8 is a hollow cube structure, the interior of which meets the purpose of sensor installation and fastening; a U-shaped opening with one side facing downward provides an outlet for the sensor output line.

[0037] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, an amplifier board 4 and a power board 7 are respectively fixed on both sides of the locking structure 8. Specifically, an internal threaded blind hole is reserved on the outer surface of the locking structure 8 to meet the purpose of circuit board installation and fixation.

[0038] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the amplifier board 4 is a single-channel separate ultrasonic signal gain amplifier, purchased from E-Electric Technology, model Integrate_AE_OP_Ver1.2, and its function is to amplify the data of the ultrasonic sensor 10.

[0039] In the integrated ultrasonic partial discharge monitoring device described in the utility model, in a specific implementation, the power board 7 is a channel ultrasonic-phantom power board, purchased from Edian Technology, model 1-CH_Phantom-Power, DC12V to DC28V, and its purpose is to power the amplifier board.

[0040] In the specific operation process, the monitoring system principle of the integrated ultrasonic partial discharge monitoring device based on WAPI described in the utility model is as follows Figure 5 As shown, the specific process of the integrated ultrasonic partial discharge monitoring device monitoring partial discharge of the power transformer is as follows: the integrated ultrasonic partial discharge monitoring device is magnetically attracted to the surface of the power transformer body, the built-in ultrasonic sensor of the integrated ultrasonic partial discharge monitoring device is in close contact with the power transformer body, the ultrasonic sensor can identify the partial discharge signal that may exist inside the transformer in real time, and at the same time, the ultrasonic sensor converts the identified partial discharge signal into an electrical signal and transmits it to the gain amplifier board, and after 40DB amplification, the signal is processed and analyzed by the main board; the signal is transmitted to the station-used WAPI network server through the WAPI network access point, and the partial discharge monitoring data is obtained from the station-used WAPI network server through the converter transformer comprehensive monitoring platform server. The converter transformer comprehensive monitoring platform server can perform statistical analysis, defect identification, fault alarm and other processing on the monitoring data, thereby assisting the personnel in the station to timely discover the hidden dangers of equipment failure, and to detect and deal with them early.

[0041] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including combining various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. An integrated ultrasonic partial discharge monitoring device based on WAPI, characterized in that: It comprises a main board (3), a wireless antenna (5), an ultrasonic sensor (10), a spring (9), a shell (11), an upper cover (1) and a shell bottom plate (6) respectively fixedly connected to the top and bottom of the shell (11); the wireless antenna (5) is installed on the outer wall of the shell (11); the main board (3) is fixedly connected to the inner side of the upper cover (1); and the ultrasonic sensor (10) is installed on the inner side of the shell bottom plate (6); The upper part of the ultrasonic sensor (10) contacts the bottom end of the spring (9), the spring (9) and the ultrasonic sensor (10) are placed inside the locking structure (8), the top end of the spring (9) contacts the top surface inside the locking structure (8), the bottom of the locking structure (8) is fixed to the inner side of the housing bottom plate (6), and the two sides of the locking structure (8) are respectively fixed with an amplifier board (4) and a power board (7); The power signal output end of the power board (7) is respectively connected to the power signal input end of the amplifier board (4) and the power signal input end of the main board (3); the ultrasonic signal output end of the ultrasonic sensor (10) is connected to the ultrasonic signal input end of the amplifier board (4); the amplified ultrasonic signal output end of the amplifier board (4) is connected to the amplified ultrasonic signal input end of the main board (3); and the amplified ultrasonic signal output end of the main board (3) is connected to the signal input end of the wireless antenna (5).

2. The ultrasonic partial discharge monitoring device according to claim 1, characterized in that: A magnet (12) is arranged on the outer side of the housing bottom plate (6).

3. The ultrasonic partial discharge monitoring device according to claim 1 or 2, characterized in that: An indicator light board (2) is arranged on the inner side of the upper cover (1), and a signal input end of the indicator light board (2) is connected to an indicator light signal output end of the main board (3).

4. The ultrasonic partial discharge monitoring device according to claim 1, characterized in that: The shell bottom plate (6) is made of an epoxy plate with a thermal conductivity of 0.2-0.5 W / (m·°C).

5. The ultrasonic partial discharge monitoring device according to claim 1, characterized in that: The shell (11) is made of aluminum alloy with a thermal conductivity of 200-260 W / (m·°C).

6. The ultrasonic partial discharge monitoring device according to claim 1, characterized in that: The ultrasonic sensor (10) is mounted at the middle of the inner side of the housing bottom plate (6).

7. The ultrasonic partial discharge monitoring device according to claim 1, characterized in that: The wireless antenna (5) is fixedly mounted on the outer side wall of the housing (11) via a nut.

8. The ultrasonic partial discharge monitoring device according to claim 1, characterized in that: The wireless antenna (5) is a two-in-one waterproof antenna for WAPI and GPS, and is in the form of a mushroom head.

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