Method and system for detecting three-dimensional pressure distribution of faying surface of fracture of field suppression switch

Abstract

The invention provides a three-dimensional pressure distribution detection method and system for a field suppression switch fracture lap joint surface. The method comprises the following steps: acquiring scanning acquisition data of the field suppression switch fracture lap joint surface, establishing a switch lap joint surface model, performing theoretical pressure analysis based on model construction, and forming pressure data of the field suppression switch fracture lap joint surface model; acquiring contact pressure data of a magnetic suppression switch fracture lap joint surface, and performing pressure fitting analysis based on an acquisition position in combination with the switch lap joint surface model to form lap joint surface pressure acquisition distribution data; and pressure deviation analysis is carried out by combining the model pressure data of the magnetic suppression switch fracture lap joint surface and the lap joint surface pressure acquisition distribution data, and lap joint surface pressure detection analysis result data are formed. According to the method, data of the built field suppression switch lap joint surface model and pressure data collected by a sensor are compared and analyzed to accurately analyze and judge the lap joint pressure condition of the lap joint surface.

Description

Technical Field

[0001] The present invention relates to the technical field of field discharge switches, and particularly relates to a method and system for detecting the three-dimensional pressure distribution of the contact surface of a field discharge switch Background Art

[0002] A field discharge switch is an electrical device used for generators or motors, mainly used to quickly cut off the excitation current when the device shuts down or fails, so as to prevent the device from being damaged due to the continuous existence of the magnetic field. When working normally, the field discharge switch is closed. In order to ensure that the field discharge switch can provide a stable current for generating excitation under normal conditions, the contact of its contact surface needs to ensure a stable foundation.

[0003] Currently, the contact stability of the contact surface can be measured by setting thin-film pressure sensors at the contact surface. How to reasonably utilize and analyze the measurement results to accurately detect the contact situation at the contact surface is a problem worthy of consideration.

[0004] Therefore, designing a method for detecting the three-dimensional pressure distribution of the contact surface of a field discharge switch, and comparing and analyzing the model data of the contact surface of the field discharge switch established with the pressure data collected by the sensor to accurately analyze and judge the contact pressure situation of the contact surface, is an urgent problem to be solved at present. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and system for detecting the three-dimensional pressure distribution of the contact surface of a field discharge switch. By collecting the model data of the contact surface of the field discharge switch, a contact surface model is established, and then the contact reliability can be analyzed by using the working characteristics and structural characteristics of the contact surface, forming the contact pressure distribution data corresponding to the contact surface model. After collecting the sensor data of the contact pressure, on the one hand, combined with the contact surface model, the pressure distribution of the contact surface under the actual state can be reasonably analyzed and determined. On the other hand, it can also be compared and analyzed with the contact pressure distribution data of the model to determine whether the pressure distribution on the contact surface meets the requirements of the working reliability of the field discharge switch, thereby realizing the accurate and reasonable detection of the contact pressure of the contact surface, ensuring the effective real-time monitoring of the pressure distribution of the contact surface, and avoiding damage to the equipment caused by unreasonable contact surface pressure.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: A method for detecting the three-dimensional pressure distribution of the contact surface of a field discharge switch, comprising: Obtaining the scanned acquisition data of the contact surface of the field discharge switch, establishing a switch contact surface model, and performing theoretical pressure analysis based on the model construction to form the model pressure data of the contact surface of the field discharge switch; Collect the contact pressure data of the disconnector contact surface of the field discharge switch, and combine it with the switch contact surface model to perform pressure fitting analysis based on the collection position to form the pressure acquisition distribution data of the contact surface; Combine the pressure data of the disconnector contact surface model of the field discharge switch and the pressure acquisition distribution data of the contact surface to perform pressure deviation analysis to form the pressure detection analysis result data of the contact surface. This method establishes a contact surface model by collecting the model data of the disconnector contact surface of the field discharge switch, and then can analyze the contact reliability by using the working characteristics and structural features of the contact surface to form the lap pressure distribution data corresponding to the contact surface model. After collecting the sensor data of the contact pressure, on the one hand, combined with the contact surface model, it can reasonably analyze and determine the pressure distribution of the contact surface under the actual state. On the other hand, it can also be compared and analyzed with the lap pressure distribution data of the model to determine whether the pressure distribution on the contact surface meets the requirements of the working reliability of the field discharge switch, so as to realize the accurate and reasonable detection of the lap pressure of the contact surface, ensure the effective real-time monitoring of the pressure distribution of the contact surface, and avoid damage to the equipment caused by unreasonable contact surface pressure.

[0007] The above-mentioned method for obtaining the scanning data of the disconnector contact surface of the field discharge switch, establishing the switch contact surface model, and performing theoretical pressure analysis based on the model construction to form the pressure data of the disconnector contact surface model of the field discharge switch includes: According to the scanning acquisition data of the disconnector contact surface of the field discharge switch, extract the scanning dimension information and the contact surface material information for modeling to form the switch contact surface model; Perform pressure analysis on the switch contact surface model based on structural stress and contact reliability to determine the allowable lap pressure range; According to the scanning acquisition data of the disconnector contact surface of the field discharge switch, extract the thermal damage information of the contact surface, and combine it with the allowable lap pressure range to perform pressure change characteristic analysis to form the pressure data of the disconnector contact surface model of the field discharge switch.

[0008] The main purpose of establishing a model for the contact surface of the field discharge switch is to obtain the characteristic range data of the allowable contact pressure change under the condition that the contact surface can work stably and reliably, so as to use the characteristic range data as the reference basis for collecting and comparing real-time contact pressure data, and efficiently and accurately determine whether the real-time contact pressure affects the reliable and stable operation of the switch. Here, it should be noted that the established model is not simply a structural model based on structural data, but model data that endows the structure with material characteristic information, that is, model data that can truly simulate the actual state of the contact surface. On this basis, the pressure distribution analysis of the structure stress and lap reliability is carried out on the model, and then the characteristic data of the allowable pressure distribution of the lap surface model is determined. Therefore, the scanned acquisition data includes the three-dimensional structure data formed by scanning and the material information obtained by means not limited to spectral analysis.

[0009] The above pressure analysis of the switch lap surface model based on structural stress and contact reliability to determine the allowable lap pressure range includes: Determine the reliability limit index, and take the reliability limit index as the analysis target, conduct a contact analysis of the uniform pressure continuous change on the entire lap surface of the switch lap surface model, and determine the uniform pressure value of the reliable lap surface ; Take the allowable stress of the lap surface structural material as the analysis target, conduct a contact analysis of the uniform pressure continuous change on the entire lap surface of the switch lap surface model, and determine the uniform allowable pressure value of the lap surface ; According to the uniform pressure value of the reliable lap surface and the uniform allowable pressure value of the lap surface , form the allowable lap pressure range A, where A = , , and < .

[0010] In the present invention, the characteristic information to be extracted for the pressure condition on the lapping surface includes the maximum value that the contact surface pressure can reach and the minimum value allowed. For the maximum value that can be reached, the maximum force generated by the mutual contact before the material undergoes irreversible changes is taken as the analysis target to determine here. This force analysis for the model only requires providing the continuously changing and increasing contact surface pressure value to be determined, and the allowable stress of the material is used as the judgment result. For the minimum value allowed, it can be understood that the smaller the contact pressure of the lapping surface, the greater the probability of poor contact. And the target for the working reliability of the lapping surface can be determined according to the actual situation. For example, taking the stable contact guaranteeing the flow of the excitation current within a certain time after the lapping surface pressure is reduced to a certain value as the reliability judgment index, or taking the loss of the excitation current value after the lapping surface pressure is reduced to a certain value as the reliability judgment index, etc. By limiting the range in two directions of the lapping pressure value, the allowable lapping pressure range is determined. It should be noted that in the analysis of the maximum value reached and the minimum value allowed, the lapping surface pressure of the model is idealized, that is, the pressure on the entire lapping surface is the same. This helps with model analysis and also avoids inaccurate measurement criteria for the obtained results due to excessive local pressure.

[0011] Based on the data collected by scanning the lapping surface of the field discharge switch contact, extracting the thermal damage information of the lapping surface, and combining with the allowable lapping pressure range to conduct pressure change characteristic analysis, the model pressure data of the lapping surface of the field discharge switch contact is formed, including: Determining the minimum thermal damage distance according to the thermal damage information of the lapping surface ; According to the minimum thermal damage distance and the allowable lapping pressure range A, determining the maximum pressure change gradient , where ; Combining the maximum pressure change gradient and the allowable lapping pressure range A to form the model pressure data of the lapping surface of the field discharge switch contact.

[0012] In the present invention, it can be understood that, ideally, the contact pressure on the lapping surface is evenly distributed across the entire lapping surface. However, in reality, there may be situations where the local pressure is too high or too low. Such pressure differences can also cause overheating or arcing at local positions, resulting in thermal damage within a certain range at these positions. Therefore, the pressure change gradient also needs to be analyzed. It can be understood that the greater the pressure change within a smaller area, the higher the probability of thermal damage in the corresponding area. Thus, the acquisition of characteristic information regarding the pressure change gradient is mainly determined based on the rate of change of the maximum pressure difference within the allowable pressure range over the minimum distance range. Here, the minimum value of the historically smallest thermal damage area is used as the distance measure for the pressure change gradient to obtain the maximum pressure change gradient.

[0013] The above-mentioned process of collecting the contact pressure data of the disconnector's contact surface and conducting pressure fitting analysis based on the collection position in combination with the switch contact surface model to form the contact surface pressure collection distribution data includes: According to the switch contact surface model, conduct pressure transfer analysis within the allowable stress range of the material to determine the maximum pressure loss gradient; Based on the contact pressure data, determine the positions of different collected contact pressure values in the switch contact surface model and mark them as the collection point positions; According to the maximum pressure loss gradient and the corresponding collected contact pressure values at the collection point positions, conduct collection pressure distribution analysis on the switch contact surface model to form the contact surface pressure collection distribution data.

[0014] In the present invention, after obtaining the allowable lapping pressure range of the lapping surface and the limit value of the pressure change gradient, they can be used as standards to conduct comparative analysis on the real-time collected lapping surface pressure data to determine the rationality of the current pressure. Of course, to achieve this comparison result, the collected lapping pressure data also needs to be processed. After all, the lapping pressure data collected by the sensor is discrete, while the pressure distribution on the lapping surface is continuous. Therefore, it is necessary to fit the collected discrete data to form continuous data. This fitting method mainly conducts pressure change continuity analysis within the range of the maximum loss gradient based on the collected lapping pressure values. The so-called pressure change continuity analysis refers to fitting based on the discrete lapping surface pressure data, ensuring that the pressure values determined by fitting at positions where the lapping surface pressure is not detected are continuous to be closer to the real-time situation.

[0015] The above-mentioned process of conducting pressure transfer analysis within the allowable stress range of the material according to the switch contact surface model to determine the maximum pressure loss gradient includes: Using the reliable lapping surface uniform pressure value within the allowable lapping pressure range A is the applied value of the force on the model. Select M spaced force application position points on the lap joint surface, and ensure that all the force application position points are evenly distributed on the lap joint surface; Determine the angular interval value. With each force application position point as the center, determine different pressure diffusion directions that are spaced at the angular interval value on the entire circumference; Apply the uniform pressure value of the reliable lap joint surface to one force application position point each time and obtain the pressure change gradients in all pressure diffusion directions corresponding to the force application position point; Determine the corresponding average pressure change gradient of the position point according to all the pressure change gradients corresponding to the force application position point; Extract the maximum average pressure change gradient among all the force application position points and label it as the maximum pressure loss gradient.

[0016] In the present invention, the acquisition of the maximum pressure loss gradient is mainly to determine the characteristics of the lap joint surface material in the transmission of pressure, so as to be able to determine the pressure values at the positions that have not been collected when fitting the pressure distribution on the entire lap joint surface using discrete pressure acquisition data, and the determined pressure values can establish a continuously varying gradient relationship with the pressure values at the acquisition points. To obtain the maximum loss gradient, first, the same pressure value is input to each position point on the model, then the gradient values of the pressure change in the line direction of the entire circumferential direction are determined, and then the average value of these gradient values is taken as the gradient situation of the pressure transmission after force application at the corresponding position. Finally, the maximum average pressure change gradient is used as the maximum pressure damage gradient value allowed on the entire model.

[0017] Perform the acquisition pressure distribution analysis on the switch lap joint surface model according to the above maximum pressure loss gradient and the acquisition contact pressure value corresponding to the acquisition point position, and form the lap joint surface pressure acquisition distribution data, including: Taking the maximum pressure loss gradient as the limit value of pressure diffusion, perform pressure fitting on the area between adjacent acquisition point positions according to the acquisition contact pressure values corresponding to different acquisition point positions, and ensure that the pressure values have a continuously varying relationship within the limit range of the maximum pressure loss gradient on the line connecting any two points on the lap joint surface; Obtain the pressure data on the entire lap joint surface to form the lap joint surface pressure acquisition distribution data.

[0018] In the present invention, within the maximum damage gradient range, discrete pressure values are used as the standard for fitting the pressure values in the pressure value acquisition area. The fitting needs to ensure that the pressure change rate on the line connecting the pressure values at any two position points of the pressure data of the entire lap joint surface formed finally is stable, that is, the pressure gradient on the line is a certain fixed value and does not exceed the maximum loss gradient. When performing pressure fitting for the area between adjacent acquisition point positions, the pressure values at different distances in the circumferential direction relative to the acquisition point positions can be determined starting from the two acquisition point positions respectively with the maximum loss gradient as a reference. In this way, each position point in the area will have two pressure values, that is, the pressure values formed by the gradient change with the two acquisition point positions as the reference respectively. Determine whether there is a situation where the two pressure values at the same position point are the same. If so, no adjustment of the fitting is required. If not, determine all the position points with the smallest difference between the two pressure values. Taking this point as the reference, adjust the smaller pressure value, that is, replace the smaller pressure value with the larger pressure value, and then determine the loss gradient value of the uniform change of the pressure value according to the pressure value at the acquisition position point corresponding to the smaller pressure value, and finally form a smooth regional pressure fitting distribution. Here, adjusting the smaller pressure value can avoid the loss gradient value obtained after adjustment exceeding the maximum loss gradient.

[0019] Combining the pressure data of the disconnector contact lap joint surface model and the lap joint surface pressure acquisition distribution data as described above, performing pressure deviation analysis, and forming the lap joint surface pressure detection analysis result data, including: Based on the pressure data of the disconnector contact lap joint surface model, performing a comparative analysis of the lap joint surface pressure acquisition distribution data based on the pressure change gradient, and determining the pressure gradient deviation influence range data; Based on the pressure data of the disconnector contact lap joint surface model, performing a comparative analysis of the lap joint surface pressure acquisition distribution data within the pressure range, and forming the pressure value deviation influence range data.

[0020] In the present invention, after the distribution data is obtained, it can be compared and analyzed with the pressure data of the lap joint surface model. The comparative analysis considers two aspects. One is the situation where the local pressure change is too large, which is likely to cause thermal damage to the local area, so it needs to be analyzed and determined. The other is that each pressure value on the lap joint surface is within the range defined by the pressure data of the lap joint surface model. Only when both aspects are completed with the comparative analysis can it be shown that the detection and processing of the three-dimensional pressure distribution of the lap joint surface are achieved.

[0021] The above-mentioned comparative analysis of the lap joint surface pressure acquisition distribution data based on the pressure change gradient according to the pressure data of the disconnector contact lap joint surface model, and determining the pressure gradient deviation influence range data, includes: Based on the lap joint surface pressure acquisition distribution data, extracting the pressure change values, and determining the pressure change rate distribution data of the entire lap joint surface; According to the pressure change rate distribution data, compare the maximum pressure change gradient , determine the position area where the pressure change rate exceeds the maximum pressure change gradient , and determine the maximum gradient change area distance of the position area , n represents the number of different position areas where the determined pressure change rate exceeds the maximum pressure change gradient ; According to the minimum thermal damage distance , and determine the following influence ranges for different maximum gradient change area distances : If > , then determine the midpoint of the line segment where the maximum gradient change area distance is located, and with the midpoint as the center and the minimum thermal damage distance as the diameter, determine the corresponding pressure gradient deviation influence range area; If ≤ , then with the midpoint of the line segment where the maximum gradient change area distance is located as the center and the maximum gradient change area distance as the diameter, determine the corresponding pressure gradient deviation influence range area; Collect all different pressure gradient deviation influence range areas to form pressure gradient deviation influence range data.

[0022] The above-mentioned comparison and analysis of the pressure range of the lap joint surface pressure acquisition distribution data based on the pressure data of the disconnector contact lap joint surface model form pressure value deviation influence range data, including: According to the lap joint surface pressure acquisition distribution data, compare the allowable lap joint pressure range A, determine the position area where the pressure value does not belong to the allowable lap joint pressure range A, and determine the maximum pressure value change area distance of the position area ; According to the minimum thermal damage distance , and determine the following influence ranges for different maximum pressure value change area distances : If > , then determine the midpoint of the line segment where the maximum pressure value change area distance is located, and with the midpoint as the center and the minimum thermal damage distance as the diameter, determine the corresponding pressure value deviation influence range area; If ≤ , then with the midpoint of the line segment where the maximum pressure value change area distance Taking the midpoint of the line segment as the center of the circle and the distance of the maximum pressure value change area as the diameter, the corresponding pressure value deviation influence range area is determined; Collect all different pressure value deviation influence range areas to form pressure value deviation influence range data.

[0023] In the present invention, the comparative analysis of the pressure value is to make a comparative judgment on the allowable lap pressure range according to the lap surface pressure acquisition distribution data, and determine the position area where the pressure value does not belong to the allowable range. Similarly, when the pressure value does not belong to the allowable range, thermal damage will occur, and the minimum range of thermal damage is the range defined by the minimum thermal damage distance. Therefore, by judging whether the area size reaches the area size limited by the minimum thermal damage distance, the possible damage area range of the pressure value deviation is determined.

[0024] A system using the above-mentioned three-dimensional pressure distribution detection method for the disconnector contact surface of the field discharge switch, the system includes a model analysis unit, a pressure fitting unit and a detection and comparison unit; The model analysis unit is used to obtain the scanned acquisition data of the disconnector contact surface of the field discharge switch, establish a switch contact surface model, and perform theoretical pressure analysis based on the model construction to form the model pressure data of the disconnector contact surface of the field discharge switch; The pressure fitting unit is used to collect the contact pressure data of the disconnector contact surface of the field discharge switch, and perform pressure fitting analysis based on the acquisition position in combination with the switch contact surface model to form the lap surface pressure acquisition distribution data; The detection and comparison unit receives the data of the model analysis unit and the pressure fitting unit, and is used to combine the model pressure data of the disconnector contact surface of the field discharge switch and the lap surface pressure acquisition distribution data to perform pressure deviation analysis and form the lap surface pressure detection and analysis result data.

[0025] A three-dimensional pressure distribution detection method for the disconnector contact surface of the field discharge switch mentioned in the present invention, by collecting the model data of the disconnector contact surface of the field discharge switch to establish a contact surface model, and then being able to analyze the contact reliability by using the working characteristics and structural characteristics of the contact surface, forming the lap pressure distribution data corresponding to the contact surface model. After collecting the data of the contact pressure by the sensor, on the one hand, in combination with the contact surface model, it can realize a reasonable analysis and determination of the pressure distribution of the contact surface under the actual state. On the other hand, it can also be compared and analyzed with the lap pressure distribution data of the model to determine whether the pressure distribution on the contact surface meets the requirements of the working reliability of the field discharge switch, and then realize the accurate and reasonable detection of the lap pressure of the contact surface, ensure the effective real-time monitoring of the pressure distribution of the contact surface, and avoid damage to the equipment caused by unreasonable contact surface pressure. Brief Description of the Drawings

[0026] The present invention will be further described below with reference to the drawings and embodiments: Figure 1 It is a step diagram of the method for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch provided by the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the system for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch based on a thin-film pressure sensor provided by the embodiment of the present invention. Specific embodiments

[0027] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Embodiment 1: The method for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch includes: Obtain the scanned acquisition data of the contact surface of the field discharge switch, establish a switch contact surface model, and perform theoretical pressure analysis based on the model construction to form the model pressure data of the contact surface of the field discharge switch; Collect the contact pressure data of the contact surface of the field discharge switch, and perform pressure fitting analysis based on the acquisition position in combination with the switch contact surface model to form the acquisition distribution data of the contact surface pressure; Combine the model pressure data of the contact surface of the field discharge switch and the acquisition distribution data of the contact surface pressure, and perform pressure deviation analysis to form the detection analysis result data of the contact surface pressure. This method establishes a contact surface model by collecting the model data of the contact surface of the field discharge switch, and then can analyze the contact reliability by using the working characteristics and structural characteristics of the contact surface, forming the contact pressure distribution data corresponding to the contact surface model. After collecting the sensor data of the contact pressure, on the one hand, in combination with the contact surface model, it can reasonably analyze and determine the pressure distribution of the contact surface in the actual state. On the other hand, it can also be compared with the contact pressure distribution data of the model to determine whether the pressure distribution on the contact surface meets the requirements of the working reliability of the field discharge switch, thereby realizing the accurate and reasonable detection of the contact pressure of the contact surface, ensuring the effective real-time monitoring of the contact surface pressure distribution, and avoiding damage to the equipment caused by unreasonable contact surface pressure.

[0029] The above-mentioned obtaining the scanned data of the contact surface of the field discharge switch, establishing a switch contact surface model, and performing theoretical pressure analysis based on the model construction to form the model pressure data of the contact surface of the field discharge switch includes: According to the scanned acquisition data of the contact surface of the field discharge switch, extract the scanned dimension information and the contact surface material information for modeling processing to form a switch contact surface model; Perform pressure analysis on the switch contact surface model based on structural stress and contact reliability to determine the allowable contact pressure range; Collect data by scanning the contact surface of the field discharge switch, extract the thermal damage information of the contact surface, and combine it with the allowable lap pressure range to analyze the pressure change characteristics, so as to form the pressure data of the contact surface model of the field discharge switch.

[0030] The main purpose of establishing the model of the contact surface of the field discharge switch is to obtain the characteristic range data of the allowable contact pressure change under the condition that the contact surface can work stably and reliably, so as to use the characteristic range data as the reference basis for collecting and comparing the real-time contact pressure data, and efficiently and accurately determine whether the real-time contact pressure affects the reliable and stable operation of the switch. Here, it should be noted that the established model is not simply a structural model based on structural data, but model data that endows the structure with material characteristic information, that is, model data that can truly simulate the actual contact surface state. On this basis, the pressure distribution analysis of the structure stress and lap reliability is carried out on the model, and then the characteristic data of the allowable pressure distribution of the contact surface model is determined. Therefore, the scanned data includes the three-dimensional structural data formed by scanning and the material information obtained by means not limited to spectral analysis.

[0031] The above-mentioned pressure analysis of the switch contact surface model based on structural stress and contact reliability determines the allowable lap pressure range, including: Determine the reliability limit index, and take the reliability limit index as the analysis target, conduct a contact analysis of the uniform pressure continuous change on the entire lap surface of the switch contact surface model, and determine the uniform pressure value of the reliable lap surface ; Take the allowable stress of the lap surface structural material as the analysis target, conduct a contact analysis of the uniform pressure continuous change on the entire lap surface of the switch contact surface model, and determine the uniform allowable pressure value of the lap surface ; According to the uniform pressure value of the reliable lap surface and the uniform allowable pressure value of the lap surface , form the allowable lap pressure range A, where A = , , and < .

[0032] In the present invention, the characteristic information to be extracted for the pressure condition on the lapping surface includes the maximum value that the contact surface pressure can reach and the minimum value allowed. For the maximum value that can be reached, the maximum force generated by the mutual contact before the irreversible change of the material is taken as the analysis target to determine here. This kind of force analysis for the model only needs to provide the continuously changing and increasing contact surface pressure value to be determined, and the allowable stress of the material is used as the judgment result. For the minimum value allowed, it can be understood that the smaller the contact pressure of the lapping surface, the greater the probability of poor contact. And the target for the working reliability of the lapping surface can be determined according to the actual situation. For example, taking the stable contact guaranteeing the flow of the exciting current within a certain time after the lapping surface pressure is reduced to a certain value as the reliability judgment index, or taking the loss of the exciting current value after the lapping surface pressure is reduced to a certain value as the reliability judgment index, etc. By limiting the range in two directions of the lapping pressure value, the allowable lapping pressure range is determined. It should be noted that in the analysis of the maximum value reached and the minimum value allowed, the lapping surface pressure of the model is idealized, that is, the pressure on the entire lapping surface is the same. This helps to conduct model analysis and also avoids the lack of an accurate measurement standard for the obtained results due to excessive local pressure.

[0033] The above-mentioned process of scanning and collecting data on the disconnection lapping surface of the field discharge switch, extracting the thermal damage information of the lapping surface, and combining with the allowable lapping pressure range to conduct pressure change characteristic analysis to form the model pressure data of the disconnection lapping surface of the field discharge switch includes: Determine the minimum thermal damage distance according to the thermal damage information of the lapping surface ; According to the minimum thermal damage distance and the allowable lapping pressure range A, determine the maximum pressure change gradient , where ; Combining the maximum pressure change gradient and the allowable lapping pressure range A to form the model pressure data of the disconnection lapping surface of the field discharge switch.

[0034] In the present invention, it can be understood that, ideally, the contact pressure of the lapping surface is evenly distributed across the entire lapping surface. However, in reality, there may be situations where the local pressure is too high or too low. Such pressure differences can also cause overheating or electric arcs at local positions, thereby resulting in thermal damage within a certain range at those positions. Therefore, the pressure change gradient also needs to be analyzed. It can be understood that the greater the pressure change within a smaller area, the higher the probability of thermal damage in the corresponding area. Thus, the acquisition of characteristic information regarding the pressure change gradient is mainly determined based on the rate of change of the maximum pressure difference within the allowable pressure range over the minimum distance range. Here, the minimum value of the historically smallest thermal damage area is used as the distance measure for the pressure change gradient to obtain the maximum pressure change gradient.

[0035] The above-mentioned acquisition of the contact pressure data of the disconnector contact lapping surface, combined with the switch lapping surface model, conducts pressure fitting analysis based on the acquisition position to form lapping surface pressure acquisition distribution data, including: According to the switch lapping surface model, conduct pressure transfer analysis within the allowable stress range of the material to determine the maximum pressure loss gradient; Based on the contact pressure data, determine the positions of different acquired contact pressure values in the switch lapping surface model and mark them as the acquisition point positions; According to the maximum pressure loss gradient and the corresponding acquired contact pressure values at the acquisition point positions, conduct acquisition pressure distribution analysis on the switch lapping surface model to form lapping surface pressure acquisition distribution data.

[0036] In the present invention, after obtaining the allowable lapping pressure range of the lapping surface and the limit value of the pressure change gradient, they can be used as standards to compare and analyze the real-time acquired lapping surface pressure data to determine the rationality of the current pressure. Of course, to achieve this comparison result, the acquired lapping pressure data also needs to be processed. After all, the lapping pressure data collected by the sensor is discrete, while the pressure distribution on the lapping surface is continuous. Therefore, it is necessary to fit the collected discrete data to form continuous data. This fitting method mainly conducts pressure change continuity analysis within the maximum loss gradient range based on the acquired lapping pressure values. The so-called pressure change continuity analysis refers to fitting based on the discrete lapping surface pressure data, ensuring that the pressure values determined by fitting at positions where the lapping surface pressure is not detected are continuous to be closer to the real-time situation.

[0037] The above-mentioned conduct of pressure transfer analysis within the allowable stress range of the material according to the switch lapping surface model to determine the maximum pressure loss gradient includes: With the reliable lapping surface uniform pressure value within the allowable lapping pressure range A is the force application value for the model. Select M spaced force application position points on the lap joint surface, and ensure that all force application position points are evenly distributed on the lap joint surface; Determine the angular interval value. With each force application position point as the center, determine different pressure diffusion directions that are spaced at the angular interval value on the entire circumference; Apply the uniform pressure value of the reliable lap joint surface to one force application position point each time and obtain the pressure change gradients in all pressure diffusion directions corresponding to the force application position point; Determine the corresponding average pressure change gradient of the position point according to all pressure change gradients corresponding to the force application position point; Extract the maximum average pressure change gradient among all force application position points and label it as the maximum pressure loss gradient.

[0038] In the present invention, the acquisition of the maximum pressure loss gradient is mainly to determine the characteristics of the lap joint surface material in pressure transmission, so as to be able to determine the pressure values at positions not collected when fitting the pressure distribution on the entire lap joint surface using discrete pressure acquisition data, and the determined pressure values can establish a continuously varying gradient relationship with the pressure values at the acquisition points. To obtain the maximum loss gradient, first, the same pressure value is input to each position point on the model, then the gradient values of the pressure change in the line direction of the entire circumferential direction are determined, and then the average value of these gradient values is taken as the gradient situation of the pressure transmission after force application at the corresponding position. Finally, the maximum average pressure change gradient is used as the maximum pressure damage gradient value allowed on the entire model.

[0039] Perform an analysis of the collected pressure distribution on the switch lap joint surface model based on the above maximum pressure loss gradient and the collected contact pressure value corresponding to the acquisition point position, and form lap joint surface pressure acquisition distribution data, including: Taking the maximum pressure loss gradient as the limit value of pressure diffusion, perform pressure fitting on the area between adjacent acquisition point positions according to the collected contact pressure values corresponding to different acquisition point positions, and ensure that the pressure values have a continuously varying relationship within the limit range of the maximum pressure loss gradient on the line connecting any two points on the lap joint surface; Obtain the pressure data on the entire lap joint surface to form lap joint surface pressure acquisition distribution data.

[0040] In the present invention, within the maximum damage gradient range, the pressure values in the pressure value acquisition area are fitted based on discrete pressure values. The fitting needs to ensure that the pressure change rate on the line connecting the pressure values at any two position points of the pressure data of the entire lap joint surface formed finally is stable, that is, the pressure gradient on the line is a fixed several values and does not exceed the maximum loss gradient. When fitting the pressure in the area between adjacent acquisition point positions, the pressure values at different distances in the circumferential direction relative to the acquisition point positions can be determined starting from the two acquisition point positions respectively with the maximum loss gradient as a reference. In this way, each position point in the area will have two pressure values, that is, the pressure values formed by the gradient changes based on the two acquisition point positions respectively. Determine whether there is a situation where the two pressure values at the same position point are the same. If so, no adjustment of the fitting is required. If not, determine all the position points with the smallest difference between the two pressure values. Take this point as a reference to adjust the smaller pressure value, that is, replace the smaller pressure value with the larger pressure value, and then determine the loss gradient value of the uniform pressure change according to the pressure value at the acquisition position point corresponding to the smaller pressure value. Finally, a smooth regional pressure fitting distribution is formed. Here, adjusting the smaller pressure value can avoid the loss gradient value obtained after adjustment exceeding the maximum loss gradient.

[0041] The above combines the pressure data of the disconnector contact lap joint surface model and the lap joint surface pressure acquisition distribution data to perform pressure deviation analysis to form the lap joint surface pressure detection analysis result data, including: Based on the pressure data of the disconnector contact lap joint surface model, perform a comparative analysis of the lap joint surface pressure acquisition distribution data based on the pressure change gradient to determine the pressure gradient deviation influence range data; Based on the pressure data of the disconnector contact lap joint surface model, perform a comparative analysis of the lap joint surface pressure acquisition distribution data within the pressure range to form the pressure value deviation influence range data.

[0042] In the present invention, after the distribution data is obtained, it can be compared and analyzed with the pressure data of the lap joint surface model. The comparative analysis considers two aspects. One is the situation where the local pressure change is too large, which is likely to cause thermal damage to the local area, so it needs to be analyzed and determined. The other is that each pressure value on the lap joint surface is within the range defined by the pressure data of the lap joint surface model. Only when both aspects of the comparative analysis are completed can it be shown that the detection and processing of the three-dimensional pressure distribution of the lap joint surface have been achieved.

[0043] The above based on the pressure data of the disconnector contact lap joint surface model, perform a comparative analysis of the lap joint surface pressure acquisition distribution data based on the pressure change gradient to determine the pressure gradient deviation influence range data, including: Based on the lap joint surface pressure acquisition distribution data, extract the pressure change values to determine the pressure change rate distribution data of the entire lap joint surface; According to the pressure change rate distribution data, compare the maximum pressure change gradient , determine the position area where the pressure change rate exceeds the maximum pressure change gradient , and determine the maximum gradient change area distance of the position area , where n represents the serial number of different position areas where the determined pressure change rate exceeds the maximum pressure change gradient ; According to the minimum thermal damage distance , and for different maximum gradient change area distances , determine the following influence ranges: If > , then determine the midpoint of the line segment where the maximum gradient change area distance is located, and with the midpoint as the center and the minimum thermal damage distance as the diameter, determine the corresponding pressure gradient deviation influence range area; If ≤ , then with the midpoint of the line segment where the maximum gradient change area distance is located as the center and the maximum gradient change area distance as the diameter, determine the corresponding pressure gradient deviation influence range area; Collect all different pressure gradient deviation influence range areas to form pressure gradient deviation influence range data.

[0044] The above-mentioned comparison and analysis of the pressure range of the lap joint surface pressure acquisition distribution data based on the pressure data of the field discharge switch contact lap joint surface model form pressure value deviation influence range data, including: According to the lap joint surface pressure acquisition distribution data, compare the allowable lap joint pressure range A, determine the position area where the pressure value does not belong to the allowable lap joint pressure range A, and determine the maximum pressure value change area distance of the position area ; According to the minimum thermal damage distance , and for different maximum pressure value change area distances , determine the following influence ranges: If > , then determine the midpoint of the line segment where the maximum pressure value change area distance is located, and with the midpoint as the center and the minimum thermal damage distance as the diameter, determine the corresponding pressure value deviation influence range area; If ≤ , then with the midpoint of the line segment where the maximum pressure value change area distance Taking the midpoint of the line segment as the center of the circle and the distance of the maximum pressure value change region as the diameter, the corresponding pressure value deviation influence range region is determined; Combining all different pressure value deviation influence range regions to form pressure value deviation influence range data. In the present invention, the comparative analysis of the pressure value is to make a comparative judgment on the allowable lap pressure range according to the lap surface pressure acquisition distribution data, and determine the position region where the pressure value does not belong to the allowable range. Similarly, when the pressure value does not belong to the allowable range, thermal damage will occur, and the range with the minimum thermal damage is the range defined by the minimum thermal damage distance. Therefore, by judging whether the area size reaches the area size limited by the minimum thermal damage distance, the possible damage area range of the pressure value deviation is determined.

[0045]

[0046] A system using the above three-dimensional pressure distribution detection method for the breaker contact surface of the field discharge switch, the system includes a model analysis unit, a pressure fitting unit and a detection and comparison unit; The model analysis unit is used to obtain the scanned acquisition data of the breaker contact surface of the field discharge switch, establish a switch contact surface model, and perform theoretical pressure analysis based on the model construction to form the model pressure data of the breaker contact surface of the field discharge switch; The pressure fitting unit is used to collect the contact pressure data of the breaker contact surface of the field discharge switch, and perform pressure fitting analysis based on the acquisition position in combination with the switch contact surface model to form the lap surface pressure acquisition distribution data; The detection and comparison unit receives the data of the model analysis unit and the pressure fitting unit, and is used to combine the model pressure data of the breaker contact surface of the field discharge switch and the lap surface pressure acquisition distribution data to perform pressure deviation analysis and form the lap surface pressure detection analysis result data.

[0047] The system further includes a host computer, and the host computer is used to execute the above detection method.

[0048] Embodiment 2: The field discharge switch is an electrical device used for generators or motors, mainly used to quickly cut off the excitation current when the device stops or fails, so as to prevent the device from being damaged due to the continuous existence of the magnetic field. When working normally, the field discharge switch is closed. In order to ensure that the field discharge switch can provide a stable current for generating excitation under normal conditions, the contact of its breaker contact surface needs to ensure a stable foundation.

[0049] Currently, the contact stability of the breaker contact surface can be measured by setting a thin film pressure sensor at the contact surface. How to reasonably utilize and analyze the measurement results to accurately detect the contact situation at the contact surface is a problem worthy of consideration.

[0050] Figures 1 to 2 Reference Figures 1 to 2The embodiment of the present invention provides a three-dimensional pressure distribution detection method for the overlapped surface of the demagnetization switch fracture. The method establishes an overlapped surface model by collecting model data of the overlapped surface of the demagnetization switch fracture, and then can use the working characteristics and structural characteristics of the overlapped surface to analyze the contact reliability, and form overlapped pressure distribution data corresponding to the overlapped surface model. After the data of the contact pressure sensor is collected, on the one hand, combined with the overlapped surface model, it is possible to realize a reasonable analysis and determination of the pressure distribution of the overlapped surface in the actual state, and on the other hand, it can also be compared and analyzed with the overlapped pressure distribution data of the model to determine whether the pressure distributed on the overlapped surface meets the requirements of the working reliability of the demagnetization switch, thereby realizing accurate and reasonable detection of the overlapped surface overlap pressure, ensuring effective real-time monitoring of the overlapped surface pressure distribution, and avoiding damage to the equipment caused by unreasonable overlapped surface pressure.

[0051] The method for detecting the three-dimensional pressure distribution on the overlapping surface of the demagnetization switch fracture specifically comprises the following steps: S1: Obtain the scanned data of the demagnetization switch fracture overlap surface, establish the switch overlap surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture overlap surface model pressure data.

[0052] The scanning data of the overlapped surface of the demagnetization switch fracture is obtained, a switch overlapped surface model is established, and a theoretical pressure analysis based on the model construction is performed to form the pressure data of the overlapped surface model of the demagnetization switch fracture, including: based on the scanned overlapped surface data of the demagnetization switch fracture, the scanning size information and the overlapped surface material information are extracted for modeling processing to form the switch overlapped surface model; a pressure analysis based on the structural force and contact reliability is performed on the switch overlapped surface model to determine the allowable overlapped pressure range; based on the scanned overlapped surface data of the demagnetization switch fracture, the overlapped surface thermal damage information is extracted, and the pressure change characteristics are analyzed in combination with the allowable overlapped pressure range to form the pressure data of the overlapped surface model of the demagnetization switch fracture.

[0053] The main purpose of modeling the overlapped surface of the demagnetization switch fracture is to obtain the characteristic range data of the contact pressure change allowed when the overlapped surface can work reliably and stably, so as to use the characteristic range data as a reference basis for collecting real-time contact pressure data for comparative analysis, and to efficiently and accurately determine whether the real-time contact pressure affects the reliable and stable operation of the switch. Here, it should be noted that the established model is not a simple structural model based on structural data, but model data that gives the structure material characteristic information, that is, model data that can truly simulate the actual overlapped surface state. On this basis, the model is analyzed for the pressure distribution of the structural stress condition and overlap reliability, and then the pressure distribution characteristic data allowed by the overlapped surface model is determined. The scanned acquisition data includes the three-dimensional structural data formed by scanning and the material information obtained by means not limited to spectral analysis.

[0054] Perform a pressure analysis on the switch lap joint surface model based on structural stress and contact reliability to determine the allowable lap pressure range, including: determining the reliability limit index, and using the reliability limit index as the analysis target, perform a contact analysis on the switch lap joint surface model with continuous change of uniform pressure on the entire lap joint surface to determine the uniform pressure value of the reliable lap joint surface ; Using the allowable stress of the lap joint surface structure material as the analysis target, perform a contact analysis on the switch lap joint surface model with continuous change of uniform pressure on the entire lap joint surface to determine the uniform allowable pressure value of the lap joint surface ; According to the uniform pressure value of the reliable lap joint surface and the uniform allowable pressure value of the lap joint surface , form the allowable lap pressure range A, where A = , , and < .

[0055] The characteristic information to be extracted for the pressure situation on the lap joint surface includes the maximum value that the contact surface pressure can reach and the allowable minimum value. For the maximum value that can be reached, here it is determined by taking the maximum force generated by the mutual contact before the material undergoes irreversible changes as the analysis target. This kind of force analysis for the model only needs to provide the continuously changing and increasing contact surface pressure value to be determined, and the allowable stress of the material is used as the judgment result. For the allowable minimum value, it can be understood that the smaller the contact pressure of the lap joint surface, the greater the probability of poor contact. And the target for the working reliability of the lap joint surface can be determined according to the actual situation. For example, taking the stable contact guarantee of the excitation current flow within a certain time after the lap joint surface pressure is reduced to a certain value as the reliability judgment index, or taking the loss of the excitation current value after the lap joint surface pressure is reduced to a certain value as the reliability judgment index, etc. Determine the allowable lap pressure range by limiting the range in two directions of the lap pressure value. It should be noted that in the analysis of the maximum value reached and the allowable minimum value, the lap joint surface pressure of the model is idealized, that is, the pressure on the entire lap joint surface is the same. This helps to conduct model analysis and also avoids inaccurate measurement criteria for the obtained results due to excessive local pressure

[0056] According to the data collected by scanning the disconnector contact lap joint surface, extract the thermal damage information of the lap joint surface, and combine it with the allowable lap pressure range to perform pressure change characteristic analysis to form the pressure data of the disconnector contact lap joint surface model, including: determining the minimum thermal damage distance according to the thermal damage information of the lap joint surface ; According to the minimum thermal damage distance and the allowable lap pressure range A, determine the maximum pressure change gradient , where ; combined with the maximum pressure change gradient and the allowable lapping pressure range A to form the pressure data of the disconnector contact surface model.

[0057] It can be understood that in the ideal state of the lapping pressure of the contact surface, the force on the entire contact surface is equal, but in fact, the local pressure may be too high or too low. This pressure difference will also cause overheating or electric arcs at local positions, resulting in thermal damage in a certain range of positions. Therefore, the pressure change gradient also needs to be analyzed. It can be understood that the greater the pressure change in a smaller area, the greater the probability of thermal damage in the corresponding area. Therefore, the acquisition of the characteristic information of the pressure change gradient is mainly determined according to the change rate of the maximum pressure difference within the allowable pressure range over the minimum distance range. Here, the minimum value of the smallest historical thermal damage area is used as the distance measure of the pressure change gradient to obtain the maximum pressure change gradient.

[0058] S2: Collect the contact pressure data of the disconnector contact surface, and perform pressure fitting analysis based on the collection position in combination with the switch contact surface model to form the contact surface pressure collection distribution data.

[0059] Collect the contact pressure data of the disconnector contact surface, and perform pressure fitting analysis based on the collection position in combination with the switch contact surface model to form the contact surface pressure collection distribution data, including: performing pressure transfer analysis within the allowable stress range of the material according to the switch contact surface model to determine the maximum pressure loss gradient; determining the positions of different collected contact pressure values in the switch contact surface model according to the contact pressure data, and calibrating them as the collection point positions; performing collection pressure distribution analysis on the switch contact surface model according to the maximum pressure loss gradient and the corresponding collected contact pressure values at the collection point positions to form the contact surface pressure collection distribution data.

[0060] After obtaining the allowable lapping pressure range of the contact surface and the limit value of the pressure change gradient, they can be used as standards to compare and analyze the real-time collected contact surface pressure data to determine the rationality of the current pressure. Of course, to achieve this comparison result, the collected lapping pressure data also needs to be processed. After all, the lapping pressure data collected by the sensor is discrete, while the pressure distribution on the contact surface is continuous. Therefore, it is necessary to fit the collected discrete data to form continuous data. This fitting method mainly performs pressure change continuity analysis within the maximum loss gradient range through the collected lapping pressure values. The pressure change continuity analysis mentioned here refers to fitting based on the discrete contact surface pressure data, and it is necessary to ensure that the pressure values determined by fitting at the positions where the contact surface pressure is not detected are continuous to be closer to the real-time situation.

[0061] According to the switch lapping surface model, perform pressure transfer analysis within the allowable stress range of the material to determine the maximum pressure loss gradient, including: the uniform pressure value of the reliable lapping surface within the allowable lapping pressure range A as the force application value for the model, select M spaced force application position points on the lapping surface, and ensure that all force application position points are evenly distributed on the lapping surface; determine the angular interval value, with each force application position point as the center, determine different pressure diffusion directions that are spaced at the angular interval value on the entire circumference; apply the uniform pressure value of the reliable lapping surface to one force application position point each time and obtain the pressure change gradients in all pressure diffusion directions corresponding to the force application position point; determine the corresponding position point average pressure change gradient according to all pressure change gradients corresponding to the force application position point; extract the maximum position point average pressure change gradient among all force application position points and label it as the maximum pressure loss gradient.

[0062] The acquisition of the maximum pressure loss gradient is mainly to determine the characteristics of the lapping surface material in pressure transfer, so as to be able to determine the pressure values at positions not collected when fitting the pressure distribution on the entire lapping surface using discrete pressure acquisition data, and the determined pressure values can establish a continuously varying gradient relationship with the pressure values at the acquisition points. To obtain the maximum loss gradient, first input the same pressure value to each position point on the model, then determine the gradient value of the pressure change in the line direction of the entire circumference, then obtain the average value of these gradient values as the gradient situation of the pressure transfer after force application corresponding to this position, and finally use the maximum average pressure change gradient as the maximum pressure damage gradient value allowed on the entire model.

[0063] According to the maximum pressure loss gradient and the acquisition contact pressure values corresponding to the acquisition point positions, perform acquisition pressure distribution analysis on the switch lapping surface model to form lapping surface pressure acquisition distribution data, including: using the maximum pressure loss gradient as the limit value of pressure diffusion, perform pressure fitting on the area between adjacent acquisition point positions according to the acquisition contact pressure values corresponding to different acquisition point positions, and ensure that the pressure values have a continuously varying relationship within the limit range of the maximum pressure loss gradient on the line connecting any two points on the lapping surface; obtain the pressure data on the entire lapping surface to form lapping surface pressure acquisition distribution data.

[0064] Under the maximum damage gradient range, the pressure values in the pressure value acquisition area are fitted with discrete pressure values as the standard. The fitting needs to ensure that the pressure change rate on the line connecting the pressure values at any two position points of the pressure data of the entire lap joint surface finally formed is stable, that is, the pressure gradient on the line is fixed at certain values and does not exceed the maximum loss gradient. When fitting the pressure in the area between adjacent acquisition point positions, the pressure values at different distances in the circumferential direction relative to the acquisition point positions can be determined starting from the two acquisition point positions respectively with the maximum loss gradient as a reference. In this way, each position point in the area will have two pressure values, that is, the pressure values formed by the gradient changes with the two acquisition point positions as the reference respectively. Determine whether there is a situation where the two pressure values at the same position point are the same. If so, no adjustment of the fitting is required. If not, determine all the position points with the smallest difference between the two pressure values. Based on this point, adjust the smaller pressure value, that is, replace the smaller pressure value with the larger pressure value, and then determine the loss gradient value of the uniform change of the pressure value according to the pressure value at the acquisition position point corresponding to the smaller pressure value. Finally, a smooth regional pressure fitting distribution is formed. Here, adjusting the smaller pressure value can avoid the loss gradient value obtained after adjustment exceeding the maximum loss gradient.

[0065] S3: Combine the pressure data of the disconnector contact lap joint surface model and the lap joint surface pressure acquisition distribution data to perform pressure deviation analysis and form the lap joint surface pressure detection and analysis result data.

[0066] Combine the pressure data of the disconnector contact lap joint surface model and the lap joint surface pressure acquisition distribution data to perform pressure deviation analysis and form the lap joint surface pressure detection and analysis result data, including: according to the pressure data of the disconnector contact lap joint surface model, perform a comparative analysis of the lap joint surface pressure acquisition distribution data based on the pressure change gradient to determine the pressure gradient deviation influence range data; according to the pressure data of the disconnector contact lap joint surface model, perform a comparative analysis of the pressure range of the lap joint surface pressure acquisition distribution data to form the pressure value deviation influence range data.

[0067] After the distribution data is obtained, it can be compared and analyzed with the pressure data of the lap joint surface model. The comparative analysis considers two aspects. One is the situation where the local pressure change is too large, which is likely to cause thermal damage to the local area, so it needs to be analyzed and determined. The other is that each pressure value on the lap joint surface is within the range defined by the pressure data of the lap joint surface model. Only when both aspects of the comparative analysis are completed can it be shown that the detection and processing of the three-dimensional pressure distribution of the lap joint surface have been achieved.

[0068] Based on the pressure data of the contact surface of the field discharge switch, a comparative analysis of the collected distribution data of the contact surface pressure is carried out based on the pressure change gradient to determine the data of the influence range of the deviation of the pressure gradient, including: extracting the pressure change values according to the collected distribution data of the contact surface pressure to determine the distribution data of the pressure change rate on the entire contact surface; comparing the maximum pressure change gradient according to the distribution data of the pressure change rate , determining the position area where the pressure change rate exceeds the maximum pressure change gradient , and determining the distance of the maximum gradient change area of the position area , where n represents the serial number of different position areas where the determined pressure change rate exceeds the maximum pressure change gradient ; according to the minimum thermal damage distance , and determining the following influence ranges for different maximum gradient change area distances : If > , then determine the midpoint of the line segment where the maximum gradient change area distance is located, and with the midpoint as the center and the minimum thermal damage distance as the diameter, determine the corresponding pressure gradient deviation influence range area; if ≤ , then with the midpoint of the line segment where the maximum gradient change area distance is located as the center and the maximum gradient change area distance as the diameter, determine the corresponding pressure gradient deviation influence range area; gather all different pressure gradient deviation influence range areas to form the pressure gradient deviation influence range data.

[0069] The comparative analysis of the pressure change gradient is realized by comparing the rate-of-change data formed after taking the first derivative of the collected distribution data of the contact surface pressure based on the position information. Mark the areas that exceed the maximum pressure change gradient. Considering that excessive change gradients may cause thermal damage, the area is delimited with the minimum thermal damage distance. After all, to form a thermal damage area, the size of the area must reach the range covered by the minimum thermal damage distance.

[0070] Based on the pressure data of the contact surface of the field discharge switch, a comparative analysis of the pressure range of the collected distribution data of the contact surface pressure is carried out to form the pressure value deviation influence range data, including: comparing the allowable contact pressure range A according to the collected distribution data of the contact surface pressure, determining the position area where the pressure value does not belong to the allowable contact pressure range A, and determining the maximum pressure value change area distance of the position area ; according to the minimum thermal damage distance , and determining the following influence ranges for different maximum pressure value change area distances : If > , the midpoint of the line segment where the maximum pressure value change region distance is located is determined, and with the midpoint as the center and the minimum thermal damage distance as the diameter, the corresponding pressure value deviation influence range region is determined; if ≤ ≤ , then with the midpoint of the line segment where the maximum pressure value change region distance is located as the center and the maximum pressure value change region distance as the diameter, the corresponding pressure value deviation influence range region is determined; all different pressure value deviation influence range regions are aggregated to form pressure value deviation influence range data.

[0071] The comparative analysis of the pressure value is to make a comparative judgment on the allowable lap pressure range according to the lap surface pressure acquisition distribution data, determine the position region where the pressure value does not belong to the allowable range. Similarly, when the pressure value does not belong to the allowable range, thermal damage will occur, and the minimum range of thermal damage is the range defined by the minimum thermal damage distance. Therefore, by judging whether the size of the region reaches the region size limited by the minimum thermal damage distance, the possible damage region range of the pressure value deviation is determined.

[0072] The present invention also provides a three-dimensional pressure distribution detection system for the disconnector contact lap surface of an excitation suppression switch based on a thin-film pressure sensor. The system includes: a model analysis unit for obtaining the scanned acquisition data of the disconnector contact lap surface of the excitation suppression switch and establishing the model pressure data of the disconnector contact lap surface; a pressure fitting unit for collecting the contact pressure data of the disconnector contact lap surface and performing pressure fitting analysis to form the lap surface pressure acquisition distribution data; a detection and comparison unit for comparing the model pressure data of the disconnector contact lap surface of the model analysis unit with the lap surface pressure acquisition distribution data of the pressure fitting unit to form the lap surface pressure detection distribution result data.

Claims

1. Detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch, characterized in that, Including: Obtain the scanning acquisition data of the contact surface of the field discharge switch, establish a switch contact surface model, and conduct theoretical pressure analysis based on the model construction to form the pressure data of the contact surface of the field discharge switch; Collect the contact pressure data of the contact surface of the field discharge switch, and conduct pressure fitting analysis based on the acquisition position in combination with the switch contact surface model to form the pressure acquisition distribution data of the contact surface; Combine the pressure data of the contact surface of the field discharge switch and the pressure acquisition distribution data of the contact surface, conduct pressure deviation analysis, and form the pressure detection analysis result data of the contact surface.

2. The detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch according to claim 1, characterized in that, The obtaining of the scanning data of the contact surface of the field discharge switch, establishing a switch contact surface model, and conducting theoretical pressure analysis based on the model construction to form the pressure data of the contact surface of the field discharge switch includes: According to the scanning acquisition data of the contact surface of the field discharge switch, extract the scanning dimension information and the contact surface material information for modeling processing to form a switch contact surface model; Conduct pressure analysis on the switch contact surface model based on structural stress and contact reliability to determine the allowable lap pressure range; According to the scanning acquisition data of the contact surface of the field discharge switch, extract the thermal damage information of the contact surface, and conduct pressure change characteristic analysis in combination with the allowable lap pressure range to form the pressure data of the contact surface of the field discharge switch.

3. The detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch according to claim 2, characterized in that, The conducting of pressure analysis on the switch contact surface model based on structural stress and contact reliability to determine the allowable lap pressure range includes: Determine the reliability limit index, and taking the reliability limit index as the analysis target, conduct contact analysis with continuous change of uniform pressure on the entire lap joint surface of the switch lap joint surface model to determine the reliability lap joint surface uniform pressure value ; Taking the allowable stress of the lap joint surface structure material as the analysis target, a contact analysis of the uniform pressure continuously changing on the entire lap joint surface of the switch lap joint surface model is carried out to determine the uniform allowable pressure value of the lap joint surface ; According to the uniform pressure value of the reliability lap joint surface and the uniform allowable pressure value of the lap joint surface , the allowable lap joint pressure range A is formed, where A = , , and < .

4. The detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch according to claim 3, characterized in that, The according to the scanning acquisition data of the contact surface of the field discharge switch, extracting the thermal damage information of the contact surface, and conducting pressure change characteristic analysis in combination with the allowable lap pressure range to form the pressure data of the contact surface of the field discharge switch includes: Determine the minimum thermal damage distance according to the lap joint surface thermal damage information ; According to the minimum thermal damage distance and the allowable lap pressure range A, the maximum pressure change gradient is determined , where ; Combined with the maximum pressure change gradient and the allowable lapping pressure range A, the pressure data of the contact lapping surface model of the field discharge switch is formed.

5. The detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch according to claim 4, characterized in that, The collecting of the contact pressure data of the contact surface of the field discharge switch, and conducting pressure fitting analysis based on the acquisition position in combination with the switch contact surface model to form the pressure acquisition distribution data of the contact surface includes: Conduct pressure transfer analysis within the allowable stress of the material according to the switch contact surface model to determine the maximum pressure loss gradient; According to the contact pressure data, determine the positions of different acquisition contact pressure values in the switch contact surface model and mark them as the acquisition point positions; Conduct acquisition pressure distribution analysis on the switch contact surface model according to the maximum pressure loss gradient and the acquisition contact pressure values corresponding to the acquisition point positions to form the pressure acquisition distribution data of the contact surface.

6. The detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch according to claim 5, characterized in that, The conducting of pressure transfer analysis within the allowable stress of the material according to the switch contact surface model to determine the maximum pressure loss gradient includes: Using the uniform pressure value of the reliable lap joint surface within the allowable lap joint pressure range A as the applied value of the force on the model, select M spaced force application position points on the lap joint surface, and ensure that all the force application position points are evenly distributed on the lap joint surface; Determine the angular interval value, and with each force application position point as the center, determine different pressure diffusion directions that are spaced from each other by the angular interval value on the entire circumference; Apply the uniform pressure value of the reliability lap joint surface to each of the force application position points and obtain the pressure change gradients in all pressure diffusion directions corresponding to the force application position points; According to all the pressure change gradients corresponding to the force application position points, determine the corresponding average pressure change gradient of the position points; Extract the maximum average pressure change gradient of all the force application position points and mark it as the maximum pressure loss gradient.

7. The detection method for three-dimensional pressure distribution on the contact surface of the field discharge switch according to claim 6, characterized in that, Performing acquisition pressure distribution analysis on the switch lapping surface model according to the maximum pressure loss gradient and the acquisition contact pressure values corresponding to the acquisition point positions, and forming the lapping surface pressure acquisition distribution data, including: Taking the maximum pressure loss gradient as the limit value of pressure diffusion, performing pressure fitting on the regions between adjacent acquisition point positions according to the acquisition contact pressure values corresponding to different acquisition point positions, and ensuring that the pressure values have a continuous change relationship within the limit range of the maximum pressure loss gradient on the line connecting any two points on the lapping surface; Obtaining the pressure data of the entire lapping surface and forming the lapping surface pressure acquisition distribution data.

8. The method for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch according to claim 7, wherein, Combining the pressure data of the disconnector lapping surface model and the lapping surface pressure acquisition distribution data, performing pressure deviation analysis, and forming the lapping surface pressure detection analysis result data, including: Performing a comparative analysis based on the pressure change gradient on the lapping surface pressure acquisition distribution data according to the pressure data of the disconnector lapping surface model, and determining the pressure gradient deviation influence range data; Performing a comparative analysis of the pressure range on the lapping surface pressure acquisition distribution data according to the pressure data of the disconnector lapping surface model, and forming the pressure value deviation influence range data.

9. The method for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch according to claim 8, wherein, Performing a comparative analysis based on the pressure change gradient on the lapping surface pressure acquisition distribution data according to the pressure data of the disconnector lapping surface model, and determining the pressure gradient deviation influence range data, including: Performing extraction of pressure change values according to the lapping surface pressure acquisition distribution data, and determining the pressure change rate distribution data of the entire lapping surface; Based on the pressure change rate distribution data, compare the maximum pressure change gradient , and determine the position area where the pressure change rate exceeds the maximum pressure change gradient . Also, determine the distance of the maximum gradient change area in the position area , where n represents the serial number of different position areas where the determined pressure change rate exceeds the maximum pressure change gradient . According to the minimum thermal damage distance and determine the following influence ranges for different distances of the maximum gradient change region : If > , the midpoint of the line segment where the maximum gradient change region distance is located is determined, and with the midpoint as the center and the minimum thermal damage distance as the diameter, the corresponding pressure gradient deviation influence range region is determined; If ≤ , then taking the midpoint of the line segment where the distance of the maximum gradient change region is located as the center, and taking the distance of the maximum gradient change region as the diameter, a corresponding pressure gradient deviation influence range region is determined; Aggregating all different pressure gradient deviation influence range regions to form the pressure gradient deviation influence range data.

10. The method for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch according to claim 9, wherein, Performing a comparative analysis of the pressure range on the lapping surface pressure acquisition distribution data according to the pressure data of the disconnector lapping surface model, and forming the pressure value deviation influence range data, including: According to the collected distribution data of the lapping surface pressure, compare with the allowable lapping pressure range A, determine the position area where the pressure value does not belong to the allowable lapping pressure range A, and determine the distance of the maximum pressure value change area of the position area ; According to the minimum thermal damage distance and for different distances of the maximum pressure value change regions the determination of the following influence ranges is carried out: If > , the midpoint of the line segment where the maximum pressure value change region is located is determined, and a corresponding pressure value deviation influence range region is determined with the midpoint as the center and the minimum thermal damage distance as the diameter; ​ like ≤ , then the distance of the area with the maximum pressure value change The midpoint of the line segment is the center of the circle, and the distance from the maximum pressure value change area is is the diameter, and the corresponding pressure value deviates from the influence range area; Aggregating all different pressure value deviation influence range regions to form the pressure value deviation influence range data.

11. The system using the method for detecting the three-dimensional pressure distribution of the contact surface of the field discharge switch according to claim 10, wherein, The system includes a model analysis unit, a pressure fitting unit, and a detection and comparison unit; The model analysis unit is used to obtain the scanning acquisition data of the disconnector lapping surface, establish a switch lapping surface model, and perform theoretical pressure analysis based on the model construction to form the pressure data of the disconnector lapping surface model; The pressure fitting unit is used to acquire the contact pressure data of the disconnector lapping surface, and perform pressure fitting analysis based on the acquisition position in combination with the switch lapping surface model to form the lapping surface pressure acquisition distribution data; The detection and comparison unit receives the data of the model analysis unit and the pressure fitting unit, and is used to combine the pressure data of the disconnector lapping surface model and the lapping surface pressure acquisition distribution data, perform pressure deviation analysis, and form the lapping surface pressure detection analysis result data.

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