A transformer oil insulation state detection device under alternating current and direct current electric field

Abstract

The application provides a transformer oil insulation state detection device under alternating current and direct current electric field, which comprises: a light shield, a support plate arranged in the light shield, an oil cup arranged on the support plate, a simulation mechanism arranged on the support plate, and a detection mechanism arranged on the support plate. The simulation mechanism is connected with alternating current and direct current power supply, and an electric field is generated in the oil cup to simulate the internal discharge environment of the transformer. The detection mechanism is used to obtain the brightness and number of laser light points in the transformer oil under the electric field simulation discharge environment generated by the simulation mechanism, so as to detect and judge the insulation state of the transformer oil. The detection device can detect and judge the insulation state of the insulation oil by measuring the brightness and number of laser light points in the insulation oil under the electric field condition.

Description

Technical Field

[0001] This invention relates to the field of transformer oil insulation testing technology, and more specifically, to a transformer oil insulation condition testing device under AC / DC electric fields. Background Technology

[0002] Power transformers are fundamental electrical facilities in substations, and large power transformers operating in power grids are generally oil-immersed power transformers. The transformer oil in a power transformer serves two main functions: firstly, it acts as an internal insulating medium, ensuring good insulation between windings and between the windings and the grounded core and tank; secondly, it acts as a heat dissipation medium, transferring heat dissipated from the transformer core and windings to the cooling medium. Therefore, transformer oil plays a crucial role in ensuring the normal and safe operation of power transformers.

[0003] In existing technologies, it is typically necessary to simultaneously collect various indicators of transformer oil, such as dielectric loss factor, insulation strength, and moisture content, to detect the insulation condition of the transformer oil. While these methods can accurately measure various performance parameters of the transformer oil, they require separate testing and measurement for each indicator, necessitating the use of different measuring devices for each, making the measurement process complex, time-consuming, and labor-intensive. Furthermore, these methods can only be used for offline testing of transformer oil under no electric field conditions, lacking online monitoring under electric field conditions. Summary of the Invention

[0004] In view of this, the present invention proposes a transformer oil insulation condition detection device under AC and DC electric fields, which aims to solve the problems of complex, time-consuming and labor-intensive offline monitoring of transformer oil condition.

[0005] This invention proposes a transformer oil insulation state detection device under AC / DC electric fields. The detection device includes: a light shield; a support plate disposed within the light shield; an oil cup disposed on the support plate for storing transformer oil; a simulation mechanism disposed on the support plate for generating an electric field within the oil cup through an external AC / DC power supply to simulate the internal discharge environment of a transformer; and a detection mechanism disposed on the support plate for detecting the insulation state of the transformer oil in the oil cup under the simulated discharge environment generated by the simulation mechanism.

[0006] Furthermore, in the above-mentioned transformer oil insulation condition detection device under AC / DC electric field, the simulation mechanism includes two electrodes arranged in pairs; wherein both electrodes are disposed inside the oil cup for connecting an external AC / DC power supply to generate an electric field inside the oil cup.

[0007] Furthermore, in the aforementioned transformer oil insulation condition detection device under AC / DC electric field, support rods are provided on both opposite side plates of the oil cup. Each support rod is at least partially disposed inside the oil cup. Two electrodes are respectively disposed on the ends of the two support rods located inside the oil cup. At least one of the support rods is connected to the oil cup in a position-adjustable manner to adjust the length of the support rod extending into the oil cup, thereby adjusting the distance between the two electrodes.

[0008] Furthermore, in the aforementioned transformer oil insulation condition detection device under AC / DC electric fields, at least one of the support rods is an adjusting screw structure, and the side plate of the oil cup is provided with a threaded hole adapted to the adjusting screw structure; the adjusting screw structure is provided with a length scale, which is used to obtain the distance value between the two electrodes based on the scale when the two electrodes are in contact and the current scale value on the adjusting screw structure.

[0009] Furthermore, in the aforementioned transformer oil insulation state detection device under AC / DC electric fields, the detection mechanism includes: a laser generator, a collector, and an image processor; wherein, the laser generator is used to generate laser light to penetrate the transformer oil; the collector is used to collect the light spot images generated in the transformer oil when the laser is applied to the transformer oil; the image processor is connected to the collector and is used to receive the light spot images collected by the collector and determine the insulation state of the transformer oil based on the light spot images.

[0010] Furthermore, in the above-mentioned transformer oil insulation condition detection device under AC / DC electric field, a laser mounting base is provided on one side of the oil cup on the support plate to support the laser generator so that the laser generated by the laser generator is perpendicular to the height direction of the oil cup; a fixing plate is also provided on one side of the oil cup on the support plate, and the top of the fixing plate extends to directly above the oil cup to support the data acquisition device.

[0011] Furthermore, in the above-mentioned transformer oil insulation condition detection device under AC / DC electric fields, the detection mechanism further includes: a laser calibrator for calibrating the laser; wherein the laser calibrator and the laser generator are respectively disposed on both sides of the oil cup.

[0012] Furthermore, in the aforementioned transformer oil insulation condition detection device under AC / DC electric fields, the oil cup is also equipped with a stirring assembly for stirring the transformer oil in the oil cup to eliminate air bubbles inside the transformer oil. The stirring assembly includes: a magnetic stirring body, a magnetic stirring motor, and a stirring motor support; wherein,

[0013] Furthermore, in the aforementioned transformer oil insulation condition detection device under AC / DC electric fields, the stirring assembly includes: a magnetic stirring body, a magnetic stirring motor, and a stirring motor bracket; wherein, the magnetic stirring body is disposed inside the oil cup for stirring the transformer oil inside the oil cup; the stirring motor bracket is disposed below the oil cup, and the magnetic stirring motor is disposed on the stirring motor bracket, with the power output end of the magnetic stirring motor connected to the power input end of the magnetic stirring body for driving the magnetic stirring body to rotate, thereby stirring the transformer oil.

[0014] Furthermore, in the aforementioned transformer oil insulation condition detection device under AC / DC electric fields, the bottom of the support plate is provided with a support foot for supporting the light shield.

[0015] The transformer oil insulation condition detection device under AC / DC electric field provided by this invention provides a detection environment through a light shield, ensuring the darkness of the detection environment to avoid detection errors caused by noise and light entering the detection device. An external AC / DC power supply is connected to a simulation mechanism to generate an electric field within the oil cup, simulating the internal discharge environment of a transformer. The detection mechanism, operating within the simulated discharge environment generated by the electric field, acquires the brightness and number of laser spots in the transformer oil to determine the insulation condition of the transformer oil. This detection device enables online observation of laser spots in insulating oil under electric field conditions, and the insulation condition can be detected simply by measuring the brightness and number of laser spots. Compared to existing detection methods, it requires fewer detection indicators, simplifies the measurement process, and saves time and effort, resulting in a simpler device structure and reduced detection costs. It solves the problems of complex, time-consuming, and labor-intensive offline monitoring of transformer oil conditions. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the transformer oil insulation condition detection device under AC / DC electric field provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the oil cup and stirring assembly provided in an embodiment of the present invention; Figure 3 This is a structural block diagram of the detection mechanism provided in an embodiment of the present invention. Detailed Implementation

[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] See Figures 1 to 2 This figure illustrates a preferred structure of the transformer oil insulation condition detection device under AC / DC electric fields provided in an embodiment of the present invention. As shown, the device includes: a light shield 100, a support plate 200, an oil cup 300, a simulation mechanism 400, a detection mechanism 500, and a stirring mechanism 600; wherein, A support plate 200 is disposed inside the light shield 100. Specifically, the light shield 100 provides a detection environment and ensures the darkness of the detection environment to avoid detection errors caused by noise or light entering the detection device. The support plate 200 is disposed inside the light shield 100, and the bottom of the support plate 200 may be provided with support feet 201 for supporting the light shield 100. That is, the support plate 200 is fixed to the bottom wall of the light shield 100 by four support feet 201, thereby supporting the oil cup 300, simulation mechanism 400, detection mechanism 500, and stirring mechanism 600, etc. The support feet 201 can adjust the levelness of the support plate 200.

[0019] An oil cup 300 is mounted on the support plate 200 and is used to store transformer oil. Specifically, the oil cup 300 is 15cm long, 6cm wide, and 8cm high, and is made of glass; that is, the oil cup 300 can be a glass cup to store transformer oil. In this embodiment, the lower part of the oil cup 300 can be fixed to the support plate 200 by an oil cup support column 301, such as... Figure 1 As shown, the four corners below the oil cup 300 are each supported by an oil cup support column 301. The bottom end of the oil cup support column 301 is fixedly connected to the support plate 200, and the oil cup 300 is fixed to the oil cup support column 301. In other embodiments, the oil cup support column 301 can also be a length adjusting component, which can adjust the height position of the oil cup 300. The transformer oil used is insulating oil.

[0020] The simulation mechanism 400 is disposed on the support plate 200 and is used to generate an electric field within the oil cup 300 by means of an external AC or DC power supply, so as to simulate the internal discharge environment of the transformer. Specifically, the simulation mechanism 400 is disposed on the support plate 200, and the simulation mechanism 400 generates an electric field by means of an external AC or DC power supply to simulate the internal discharge environment of the transformer.

[0021] A detection mechanism 500 is mounted on the support plate 200 and is used to detect the insulation state of the transformer oil in the oil cup 300 under the simulated discharge environment generated by the simulation mechanism 400. Specifically, the support plate 200 is also equipped with a detection mechanism 500 for detecting the insulation state of the transformer oil under the simulated discharge environment, that is, detecting the insulation state of the transformer oil, or in other words, detecting the insulation state of the transformer oil under the simulated discharge environment, obtaining the brightness and number of laser spots in the transformer oil, and judging the insulation state of the transformer oil accordingly. In this embodiment, the detection mechanism 500 can observe the laser spots in the transformer oil, and the insulation state of the transformer oil can be detected simply by measuring the brightness and number of laser spots in the transformer oil. That is to say, by detecting the brightness and number of laser spots in the transformer oil through the detection mechanism 500, the movement and distribution pattern of the transformer oil under the electric field environment can be observed with the help of the laser spots, and the insulation state of the transformer oil can be obtained. Compared with the existing detection methods, fewer detection indicators are required, the measurement process is simple, time and labor are saved, the corresponding detection device structure is simple, and thus the detection cost is reduced.

[0022] The oil cup 300 may also be equipped with a magnetic stirring component to stir the transformer oil inside the oil cup 300, so as to eliminate air bubbles inside the transformer oil, thereby ensuring uniform mixing of the transformer oil and avoiding instability of test results.

[0023] See also Figure 2 The simulation mechanism 400 includes two electrodes 401 arranged in pairs. Both electrodes 401 are disposed within the oil cup 300 and are connected to an external AC / DC power supply to generate an electric field within the oil cup. Specifically, the oil cup 300 contains two electrodes 401, designated as positive and negative electrodes. The electrodes 401 are connected to an external AC / DC power supply to generate an electric field within the transformer oil to simulate the internal discharge environment of a transformer. The radius of the electrodes 401 within the oil cup 300 can be 2 cm to simulate a slightly non-uniform electric field inside the transformer.

[0024] In this embodiment, support rods 402 are provided on both side plates of the oil cup 300, which are arranged opposite to each other. Each support rod 402 is at least partially disposed inside the oil cup 300, and two electrodes 401 are respectively disposed on the ends of the two support rods 402 located inside the oil cup 300. Specifically, the support rods 402 can be fixed to the side plates of the oil cup 300, and the two support rods 402 are coaxially arranged. The electrodes 401 are fixed on the ends of the support rods 402 near the other support rod 402, so that the two electrodes 402 are arranged opposite to each other as positive and negative electrodes, respectively, and connected to an external AC or DC power supply to generate an electric field in the transformer oil, simulating the internal discharge environment of the transformer.

[0025] In this embodiment, at least one of the support rods 402 is connected to the oil cup 300 in an adjustable manner to adjust the length of the support rod 402 extending into the oil cup 300, thereby adjusting the distance between the two electrodes 401. Specifically, the support rod 402 passes through the side plate of the oil cup 300, and its adjustable connection to the side plate allows for extension and retraction within the oil cup 300, i.e., adjusting the length of the support rod 402 extending into the oil cup 300, which in turn adjusts the position of the support rod 402 at its inner end within the oil cup 300, thereby adjusting the distance between the two electrodes 401. In this embodiment, both support rods 402 are connected to the side plate of the oil cup 300 in an adjustable manner, and both can be adjusted simultaneously. To facilitate the adjustment of the support rods 402, preferably, at least one of the support rods 402 is an adjusting screw structure. The side plate of the oil cup 300 is provided with a threaded hole adapted to the adjusting screw structure. The adjusting screw structure is threadedly connected to the side plate of the oil cup 300, so that the position of the adjusting screw structure can be adjusted by turning the knob of the adjusting screw structure, thereby achieving the purpose of adjusting the distance between the two electrodes 401. To accurately obtain the distance between the two electrodes 401, it is further preferred that the adjusting screw structure is provided with a length scale, which is used to obtain the distance value between the two electrodes based on the scale when the two electrodes are in contact and the current scale value on the adjusting screw structure. That is, the adjusting screw structure is marked with a length scale. When adjusting the distance, first, the adjusting screw structure is adjusted so that the positive and negative electrodes are in contact, and the scale value on the adjusting screw structure at this time is recorded; then, the adjusting screw structure is turned, and the change of the scale value can be observed to achieve precise adjustment of the electrode distance.

[0026] See also Figure 1 and Figure 3The detection mechanism 500 includes a laser generator 510, a collector 520, an image processor 530, and a laser calibrator 540. The laser generator 510 generates laser light to penetrate transformer oil. The collector 520 collects images of light spots generated in the transformer oil when the laser is applied. The image processor 530 is connected to the collector 520 and receives the collected images. Based on these images, it determines the insulation state of the transformer oil, or obtains the brightness and number of laser spots to assess the insulation state of the transformer oil. Specifically, the laser generator 510 generates a 50mW laser with a wavelength of 633nm. This wavelength is red light, which has a relatively long wavelength compared to other colors, resulting in good brightness contrast. The laser generated by the laser generator 510 is perpendicular to the height of the oil cup 300, i.e., horizontally. The acquisition device 520 can employ a CMOS industrial camera and its matching fixed-focus lens, with a resolution of 1900×1200, a maximum frame rate of 41fps, an aperture of 1 / 16, and an exposure time of 23690μs. The acquisition device 520 uploads the acquired laser spot images to the image processor 530. The image processor 530 can analyze the spot images based on detection algorithms to obtain the brightness and number of laser-generated spots. Based on the ability to observe the movement and distribution patterns of transformer oil under an electric field environment, especially the breakdown mechanism of transformer oil, the analysis can be performed to determine the insulation state of the transformer oil, for example, based on the analysis results. The image processor can be a host computer. The laser calibrator 540 is used to calibrate the laser to ensure that the laser is perpendicular to the height direction of the oil cup 300. In this embodiment, the laser calibrator 540 and the acquisition device 520 are respectively located on both sides of the oil cup 300 (e.g., ...). Figure 1 (As shown on the left and right sides), laser calibration can be achieved.

[0027] See also Figure 1 In this embodiment, the support plate 200 is located on one side of the oil cup 300 (e.g., Figure 1 As shown on the right side, a laser mounting base 511 is provided to support the laser generator 510 so that the laser generated by the laser generator 510 is perpendicular to the height direction of the oil cup 300. Specifically, the laser mounting base 511 is used to fix the laser generator 510 to ensure that the laser generated by the laser generator 510 remains perpendicular to the oil cup 300.

[0028] See also Figure 1 In this embodiment, the support plate 200 is located on one side of the oil cup 300 (e.g., Figure 1(As shown on the left side) A fixing plate 521 is also provided. The top of the fixing plate 521 extends directly above the oil cup 300 to support the collector 520, so that the collector 520 is positioned directly above the oil cup 300 to collect images of the transformer oil in the oil cup. In this embodiment, the fixing plate 521 and the laser mounting base 511 are respectively arranged on the left and right sides of the oil cup 300. Of course, in other embodiments, they can also be arranged on the same side. This embodiment does not impose any limitation on this.

[0029] See also Figure 2 The magnetic stirring assembly includes a magnetic stirring body 601, a magnetic stirring motor 602, and a stirring motor bracket 603. The magnetic stirring body 601 is disposed inside the oil cup 300 for stirring the transformer oil within the oil cup 300. The stirring motor bracket 603 is disposed below the oil cup 300, and the magnetic stirring motor 602 is mounted on the stirring motor bracket 603. The power output end of the magnetic stirring motor 603 is connected to the power input end of the magnetic stirring body 601, driving the magnetic stirring body 601 to rotate and thus stir the transformer oil. Specifically, the stirring motor bracket 603 can be mounted on a support plate 200, and the magnetic stirring motor 602 is mounted on the stirring motor bracket 603, connected to the magnetic stirring body 601 placed inside the oil cup 300. The magnetic stirring body 601, in conjunction with the magnetic stirring motor 602, stirs the transformer oil, which can eliminate air bubbles inside the transformer oil, thereby ensuring uniform mixing of the transformer oil and avoiding instability in the test results.

[0030] In summary, the transformer oil insulation condition detection device under AC / DC electric field provided in this embodiment provides a detection environment through the light shield 100, ensuring the darkness of the detection environment to avoid detection errors caused by noise and light entering the detection device. An external AC / DC power supply is connected to the simulation mechanism 400 to generate an electric field within the oil cup 300, simulating the internal discharge environment of the transformer. The detection mechanism 500, under the simulated discharge environment generated by the electric field of the simulation mechanism 400, acquires the brightness and number of laser spots in the transformer oil to detect and determine the insulation condition of the transformer oil. This detection device can achieve online observation of laser spots in insulating oil under electric field conditions, and only requires measuring the brightness and number of laser spots in the insulating oil to detect the insulation condition. Compared with existing detection methods, it requires fewer detection indicators, has a simpler measurement process, and saves time and effort, resulting in a simpler detection device structure and reduced detection costs. It solves the problems of complex, time-consuming, and labor-intensive offline monitoring of transformer oil conditions.

[0031] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0032] Furthermore, it should be noted that, in the description of this invention, 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 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 invention according to the specific circumstances.

[0033] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A transformer oil insulation condition detection device under AC / DC electric fields, characterized in that, include: Sunshade; A support plate is installed inside the light shield; The oil cup installed on the support plate is used to store transformer oil; The simulation mechanism installed on the support plate is used to generate an electric field in the oil cup by connecting an external AC or DC power supply, so as to simulate the internal discharge environment of the transformer. The detection mechanism installed on the support plate is used to detect the insulation state of the transformer oil in the oil cup under the simulated discharge environment generated by the simulation mechanism. The simulation mechanism includes two electrodes arranged in pairs; wherein... Both electrodes are disposed inside the oil cup for connecting to an external AC or DC power supply to generate an electric field within the oil cup; The detection mechanism includes: a laser generator, a data acquisition unit, and an image processor; wherein... The laser generator is used to generate laser light to penetrate the transformer oil; The collector is used to collect light spot images generated in the transformer oil when laser transformer oil is used; The image processor is connected to the acquisition unit and is used to receive the spot images acquired by the acquisition unit and determine the insulation status of the transformer oil based on the spot images.

2. The transformer oil insulation condition detection device under AC / DC electric field according to claim 1, characterized in that, Each of the two opposite side plates of the oil cup is provided with a support rod, and each support rod is at least partially disposed inside the oil cup. The two electrodes are respectively disposed on the ends of the two support rods located inside the oil cup. At least one of the support rods is connected to the oil cup in an adjustable manner to adjust the length of the support rod extending into the oil cup, thereby adjusting the distance between the two electrodes.

3. The transformer oil insulation condition detection device under AC / DC electric field according to claim 2, characterized in that, At least one of the support rods is an adjusting screw structure, and the side plate of the oil cup is provided with a threaded hole adapted to the adjusting screw structure; The adjusting screw structure is provided with a length scale, which is used to obtain the distance value between the two electrodes based on the scale when the two electrodes are in contact and the current scale value on the adjusting screw structure.

4. The transformer oil insulation condition detection device under AC / DC electric field according to claim 1, characterized in that, The support plate is provided with a laser mounting base on one side of the oil cup for supporting the laser generator so that the laser generated by the laser generator is perpendicular to the height direction of the oil cup. The support plate is also provided with a fixing plate on one side of the oil cup, and the top of the fixing plate extends to directly above the oil cup to support the collector.

5. The transformer oil insulation condition detection device under AC / DC electric field according to claim 1, characterized in that, The testing mechanism further includes: a laser calibrator for calibrating the laser; wherein, The laser calibrator and the laser generator are respectively located on both sides of the oil cup.

6. The transformer oil insulation condition detection device under AC / DC electric field according to any one of claims 1 to 3, characterized in that, The oil cup is also equipped with a stirring component to stir the transformer oil in the oil cup to eliminate air bubbles inside the transformer oil.

7. The transformer oil insulation condition detection device under AC / DC electric field according to claim 6, characterized in that, The stirring assembly includes: a magnetic stirring body, a magnetic stirring motor, and a stirring motor support; wherein... The magnetic stirring body is disposed inside the oil cup and is used to stir the transformer oil in the oil cup; The stirring motor bracket is located below the oil cup, and the magnetic stirring motor is mounted on the stirring motor bracket. The power output end of the magnetic stirring motor is connected to the power input end of the magnetic stirring body, which is used to drive the magnetic stirring body to rotate in order to stir the transformer oil.

8. The transformer oil insulation condition detection device under AC / DC electric field according to any one of claims 1 to 3, characterized in that, The bottom of the support plate is provided with support feet for support on the sunshade.

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