Double-channel partial discharge defect imaging observation deviation correction device and method

Abstract

The invention relates to a double-channel partial discharge defect imaging observation deviation correction device and method.The observation deviation correction device comprises a bearing platform, a defect model, a beam splitter prism, a reference imager and a correction imager, and the defect model, the beam splitter prism, the reference imager and the correction imager are installed on the bearing platform. The correction imager can also slide along the direction close to or far away from the beam splitter prism in the horizontal direction; wherein light emitted by the defect model is split by the beam splitter prism to form two light paths, one light path can enter the reference imager, and an included angle larger than or equal to 0 degree is formed between the other light path and the correction imager. According to the invention, the dual-channel optical path is constructed to synchronously monitor the partial discharge ultraviolet light signals under the front view condition and the extreme working condition at the same time, so that the synchronism is improved, and the reliability and comparability of correction data are improved; according to the correction device provided by the invention, a single-factor or multi-factor and multi-dimensional correction model of the ultraviolet monitoring result can be constructed.

Description

Technical Field

[0001] The invention relates to the field of ultraviolet imaging monitoring of partial discharge inside a valve hall of a circulation station, and in particular to a dual-channel partial discharge defect imaging observation deviation correction device and method. Background Art

[0002] At present, the role of DC transmission technology in the power system is becoming increasingly prominent, and the number of key circulating equipment such as converter valves continues to grow. However, converter valves often have partial discharge problems, which may cause equipment failure or even shutdown. Therefore, partial discharge monitoring and diagnosis of converter valves is crucial to enhancing the stability of the power grid. Ultraviolet imaging technology can achieve monitoring by detecting ultraviolet light released during partial discharge. It has been widely used in the operation and maintenance of other power transmission and transformation equipment in the power grid with its advantages of high sensitivity, strong positioning ability and technical maturity. However, since converter valves are usually installed in unmanned valve halls, and there are many converter valve equipment in the valve hall and the electric field environment is complex, the layout requirements of monitoring equipment are very strict. Therefore, it becomes quite difficult to ensure that ultraviolet imaging equipment can fully cover all converter valves at limited monitoring points. In addition, the monitoring results of ultraviolet imaging will be affected by distance and angle. The existing correction method usually uses single-channel time-sharing monitoring means for data analysis and correction, and the randomness and uncertainty of partial discharge will lead to the correction results of time-sharing monitoring being inconsistent and not comparable. Summary of the invention

[0003] In view of the above problems, a dual-channel partial discharge defect imaging observation deviation correction device and method are provided, which aims to compare and analyze the ultraviolet imaging monitoring results at different monitoring distances and monitoring angles in real time under interference-free conditions.

[0004] The specific technical solutions are as follows:

[0005] The first aspect of the present invention is to provide a dual-channel partial discharge defect imaging observation deviation correction device, comprising: a carrying platform and a defect model installed on the carrying platform, a dichroic prism, a reference imager, and a correction imager, wherein the correction imager can rotate around the vertical direction with the dichroic prism as the center, and the correction imager can also slide in the horizontal direction in a direction close to or away from the dichroic prism;

[0006] Among them, the light emitted by the defect model is split by the beam splitter prism to form two light paths, one light path can be emitted into the reference imager, and the other light path is connected to the correction imager and the beam splitter prism, and the angle between the two paths is ≥0°.

[0007] Furthermore, the observation deviation correction device also includes a distance adjustment slide rail installed on the carrying platform, the distance adjustment slide rail can rotate around the vertical direction with the dichroic prism as the center, the correction imager is embedded in the distance adjustment slide rail, and the correction imager can slide in the horizontal direction along the distance adjustment slide rail toward or away from the dichroic prism.

[0008] Furthermore, the observation deviation correction device also includes an angle driver and a control swing arm. The angle driver is installed on the bearing platform, one end of the control swing arm is installed on the driving shaft of the angle driver, and the distance adjustment slide rail is connected to the control swing arm.

[0009] Furthermore, an arc-shaped guide groove is installed on the top plate in the supporting platform, the angle driver and the control swing arm are located below the top plate, a connecting rod is passed through the guide groove, the bottom of the connecting rod is installed on the control swing arm, and the top of the connecting rod passes through the guide groove upward in the vertical direction and is connected to the distance adjustment slide rail.

[0010] Furthermore, the observation deviation correction device also includes an arc-shaped angle stabilization guide rail, which extends in the horizontal direction with the dichroic prism as the center of the circle. The bottom of the distance adjustment slide rail is embedded in the angle stabilization guide rail, and the top of the connecting rod passes through the guide groove and the angle stabilization guide rail in the vertical direction and is connected to the distance adjustment slide rail.

[0011] Furthermore, the distance adjustment slide rail is extended along the radial direction with the beam splitting prism as the center.

[0012] Furthermore, the reference imager and the correction imager are ultraviolet imagers.

[0013] The second aspect of the present invention is to provide a dual-channel partial discharge defect imaging observation deviation correction method, using the above-mentioned dual-channel partial discharge defect imaging observation deviation correction device, comprising:

[0014] Connecting the output end of the high-voltage DC power supply to the defect model so that the defect model emits an optical signal;

[0015] The correction imager and the reference imager are corrected to zero;

[0016] Adjusting the correction imager according to the monitoring distance and / or the monitoring angle, and recording the shooting data by using the reference imager and the correction imager;

[0017] The data difference between the reference imager and the correction imager is compared to obtain the correction coefficient under different monitoring distances and / or monitoring angles.

[0018] Furthermore, the correction and zeroing method is: adjusting the monitoring distance and / or the monitoring angle so that the monitoring results of the reference imager and the correction imager are consistent, that is, correcting the correction imager and the reference imager to zero.

[0019] Furthermore, the data includes but is not limited to the spot area and the number of photons.

[0020] The beneficial effects of the above scheme are:

[0021] 1) In the present invention, a dual-channel optical path is constructed to simultaneously monitor the partial discharge ultraviolet light signals under normal conditions and extreme working conditions, thereby improving synchronization and enhancing the reliability and comparability of the correction data;

[0022] 2) The correction device provided by the present invention can simulate the difference in light signal monitoring results under different monitoring angles and / or monitoring distances to construct a correction model for ultraviolet light monitoring results under single factor or multiple factors and multiple dimensions;

[0023] 3) The correction device provided by the present invention does not involve operating the defect model, the dichroic prism and the reference imager when adjusting the monitoring angle and / or the monitoring distance, which can avoid changes in the subsequent correction experiment benchmark data caused by changes in the reference benchmark optical path. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the correction device provided in an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a carrying platform provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of a partially exploded structure of a correction device provided in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the use of the correction device provided in an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the defect model provided in the embodiment of the present invention.

[0029] In the attached drawings: 1. Carrying platform; 1-1. Top plate; 1-2. Model fixing base; 1-3. Digging hole; 1-4. Imager fixing seat; 2. Defect model; 2-1. Discharge rod; 2-2. Discharge electrode; 2-3. Top equalizing ring; 2-4. Side equalizing ring; 3. Spectral prism; 4. Reference imager; 5. Correction imager; 6. Distance adjustment slide rail; 7. Angle driver; 8. Control swing arm; 9. Guide groove; 10. Connecting rod; 11. Angle stabilization guide rail. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] like Figures 1 to 4 As shown, the dual-channel partial discharge defect imaging observation deviation correction device provided in the embodiment of the present invention includes a carrying platform 1 and a defect model 2 installed on the carrying platform 1 (the defect model 2, that is, the device to be tested is installed on the model fixing base 1-2), a dichroic prism 3 (the dichroic prism 3 is installed on the carrying platform 1 through the hole 1-3), a reference imager 4 (the reference imager 4 is installed on the imager fixing base 1-4), and a correction imager 5. The above-mentioned correction imager 5 can rotate around the vertical direction with the dichroic prism 3 as the center, and the correction imager 5 can also slide in the horizontal direction in the direction close to or away from the dichroic prism 3.

[0034] In the present invention, the correction imager 5 can be adjusted first, so that the initial distances between the correction imager 5 and the reference imager 4 and the dichroic prism 3 in the horizontal direction are the same. At this time, the light emitted by the defect model 2 is split by the dichroic prism 3 to form two light paths, one of which can be incident on the reference imager 4, and the other can be incident on the correction imager 5 (at this time, the angle between the connecting line between the correction imager 5 and the dichroic prism 3 and the other light path is 0°). The monitoring results of the two are consistent, that is, the correction of the correction imager 5 and the reference imager 4 is completed. In subsequent tests, the correction imager 5 can be adjusted (such as Figure 4 As shown), by changing the front and rear distances between the corrective imager 5 and the beam splitter prism 3, and / or the size of the monitoring angle (the angle between the connecting line between the corrective imager 5 and the beam splitter prism 3 and another optical path), the partial discharge ultraviolet light signals under the normal viewing condition and the extreme working condition are monitored synchronously, and the difference in the optical signal monitoring results under different monitoring angles and / or monitoring distances is simulated, so as to construct a correction model for the ultraviolet light monitoring results under single factor or multiple factors and multiple dimensions.

[0035] As a specific example, Figure 1 , Figure 3As shown, the observation deviation correction device in the present invention may also include a distance adjustment slide rail 6 installed on the supporting platform 1, the distance adjustment slide rail 6 can rotate around the vertical direction with the dichroic prism 3 as the center, the correction imager 5 is embedded in the distance adjustment slide rail 6, and the correction imager 5 can slide in the horizontal direction along the distance adjustment slide rail 6 toward or away from the dichroic prism 3; under the above structure, the correction imager 5 can be rotated left and right according to the monitoring angle requirements, or adjusted forward and backward according to the monitoring distance.

[0036] As a specific example, Figure 3 , Figure 4 As shown, the observation deviation correction device in the present invention may also include an angle driver 7 and a control swing arm 8. The angle driver 7 (a motor-type driving structure may be directly selected) is installed on the top plate 1-1 in the carrying platform 1, and one end of the control swing arm 8 is installed on the driving shaft of the angle driver 7. The distance adjustment slide rail 6 is connected to the control swing arm 8, so that the distance adjustment slide rail 6 is driven by the angle driver 7 and the control swing arm 8 to rotate around the vertical direction with the dichroic prism 3 as the center. Based on the above driving scheme, further, in order to avoid interference with the existing structure, the present invention is more It is recommended to install the angle driver 7 and the control swing arm 8 under the top plate 1-1, and open an arc-shaped guide groove 9 on the top plate 1-1 accordingly, and then pass a connecting rod 10 through the guide groove 9. The bottom of the connecting rod 10 is installed on the control swing arm 8, and the top of the connecting rod 10 passes through the guide groove 9 upward in the vertical direction and is connected to the distance adjustment slide rail 6. Under this structure, the distance adjustment slide rail 6 can still be driven to rotate by the angle driver 7 and the control swing arm 8, but the interference with the existing structure on the top plate 1-1 during the rotation of the distance adjustment slide rail 6 can be avoided.

[0037] In order to further increase the stability of the distance adjustment slide rail 6 during its rotation, an arc-shaped angle stabilizing guide rail 11 may be further provided in the present invention. The bottom of the angle stabilizing guide rail 11 is fixedly mounted on the top plate 1-1, and is extended in the horizontal direction with the dichroic prism 3 as the center. The bottom of the distance adjustment slide rail 6 is embedded in the angle stabilizing guide rail 11, and the top of the connecting rod 10 passes through the guide groove 9 and the angle stabilizing guide rail 11 in turn in the vertical direction and is then connected to the distance adjustment slide rail 6, thereby further cooperating with the guide groove 9 to guide the rotation of the distance adjustment slide rail 6 through the angle stabilizing guide rail 11.

[0038] In the present invention, both the reference imager 4 and the correction imager 5 are ultraviolet imagers, but it is not excluded that other types of instruments and equipment may be used to perform corresponding testing work.

[0039] As a specific example, Figure 1 , Figure 5As shown, the defect model 2 comprises two discharge rods 2-1 and two discharge electrodes 2-2. The discharge rods 2-1 are mounted on the model fixed base 1-2, and the discharge electrodes 2-2 are respectively arranged on the side walls opposite to the discharge rods 2-1. Under the above structure, the output end and the ground end of the high-voltage DC power supply are respectively connected to the two discharge rods 2-1, and the output voltage is adjusted to generate electricity and emit optical signals between the two discharge rods 2-1. It should be noted that, Figure 5 As shown, in order to make the external electric field uniform and prevent discharge from occurring outside the discharge rod 2-1, two top grading rings 2-3 and two side grading rings 2-4 may be installed on the top and side of the discharge rod 2-1. In the present invention, the discharge rod 2-1 is made of insulating material such as epoxy resin material, and the discharge electrode 2-2, the top grading ring 2-3 and the side grading ring 2-4 are made of aluminum alloy material to restore the actual converter valve material.

[0040] The present invention also provides a dual-channel partial discharge defect imaging observation deviation correction method, which includes:

[0041] Connect the output end of the high-voltage DC power supply to the defect model 2, so that the defect model 2 emits an optical signal;

[0042] Correcting the correction imager 5 and the reference imager 4 to zero;

[0043] Adjust the correction imager 4 according to the monitoring distance and / or monitoring angle, and use the reference imager 4 and the correction imager 5 to record the data such as the shooting spot area and the number of photons;

[0044] The data difference between the reference imager 5 and the correction imager 4 is compared to obtain the correction coefficients at different monitoring distances and / or monitoring angles.

[0045] In the present invention, after the positions of the defect model 2, the beam splitter prism 3 and the reference imager 4 are fixed, adjustment and operation thereof are avoided as much as possible to prevent the correction reference data from changing during the subsequent correction experiment, thereby improving the reproducibility and generalizability of the correction results.

[0046] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-channel partial discharge defect imaging observation deviation correction device, characterized in that: include: A carrying platform and a defect model, a beam splitter prism, a reference imager, and a correction imager installed on the carrying platform, wherein the correction imager can rotate in a vertical direction with the beam splitter prism as the center, and the correction imager can also slide in a horizontal direction toward or away from the beam splitter prism; Among them, the light emitted by the defect model forms two light paths after being split by the beam splitter prism, one light path can be emitted into the reference imager, and the other light path has an angle with the connecting line between the correction imager and the beam splitter prism, and the angle is ≥0°.

2. The dual-channel partial discharge defect imaging observation deviation correction device according to claim 1 is characterized in that: The observation deviation correction device also includes a distance adjustment slide rail installed on the supporting platform, and the distance adjustment slide rail can rotate around the vertical direction with the dichroic prism as the center. The correction imager is embedded in the distance adjustment slide rail, and the correction imager can slide in the horizontal direction along the distance adjustment slide rail toward or away from the dichroic prism.

3. The dual-channel partial discharge defect imaging observation deviation correction device according to claim 2 is characterized in that: The observation deviation correction device also includes an angle driver and a control swing arm. The angle driver is installed on the supporting platform, one end of the control swing arm is installed on the driving shaft of the angle driver, and the distance adjustment slide rail is connected to the control swing arm.

4. The dual-channel partial discharge defect imaging observation deviation correction device according to claim 3 is characterized in that: An arc-shaped guide groove is installed on the top plate in the supporting platform, the angle driver and the control swing arm are located below the top plate, a connecting rod is passed through the guide groove, the bottom of the connecting rod is installed on the control swing arm, and the top of the connecting rod passes through the guide groove upward in the vertical direction and is connected to the distance adjustment slide rail.

5. The dual-channel partial discharge defect imaging observation deviation correction device according to claim 4 is characterized in that: The observation deviation correction device also includes an arc-shaped angle stabilizing guide rail, which extends in the horizontal direction with the dichroic prism as the center of the circle. The bottom of the distance adjustment slide rail is embedded in the angle stabilizing guide rail, and the top of the connecting rod passes through the guide groove and the angle stabilizing guide rail in the vertical direction and is connected to the distance adjustment slide rail.

6. The dual-channel partial discharge defect imaging observation deviation correction device according to any one of claims 2 to 5, characterized in that: The distance adjustment slide rail is extended along the radial direction with the beam splitting prism as the center.

7. The dual-channel partial discharge defect imaging observation deviation correction device according to claims 1-5, characterized in that: The reference imager and the correction imager are ultraviolet imagers.

8. A dual-channel partial discharge defect imaging observation deviation correction method, characterized in that: The dual-channel partial discharge defect imaging observation deviation correction device according to any one of claims 1 to 7 comprises: Connecting the output end of the high-voltage DC power supply to the defect model so that the defect model emits an optical signal; The correction imager and the reference imager are corrected to zero; Adjusting the correction imager according to the monitoring distance and / or the monitoring angle, and recording the shooting data using the reference imager and the correction imager; The data difference between the reference imager and the correction imager is compared to obtain correction coefficients at different monitoring distances and / or monitoring angles.

9. The dual-channel partial discharge defect imaging observation deviation correction method according to claim 8, characterized in that: The correction and zeroing method is: adjusting the monitoring distance and / or the monitoring angle so that the monitoring results of the reference imager and the correction imager are consistent, that is, the correction imager and the reference imager are corrected and zeroed.

10. The dual-channel partial discharge defect imaging observation deviation correction method according to claim 8, characterized in that: The data include spot area and number of photons.

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