A partial discharge fast regional positioning method, device and equipment for gas insulated switchgear and medium

Abstract

The application discloses a partial discharge fast regional positioning method, device and equipment for a gas insulated switchgear, and a medium, and relates to the technical field of partial discharge positioning. The method comprises the following steps: determining an adjacent sensor pair and a straight-line distance between the adjacent sensor pair; performing bidirectional pulse injection calibration on the adjacent sensor pair to obtain a bidirectional equivalent attenuation coefficient; determining a structure symmetry determination result of a section where the adjacent sensor pair is located according to the bidirectional equivalent attenuation coefficient; selecting a model type according to the structure symmetry determination result; collecting actual partial discharge signals of two sensors in the adjacent sensor pair to obtain corresponding actual partial discharge signal amplitudes; and determining a partial discharge source position according to the bidirectional equivalent attenuation coefficient, the actual partial discharge signal amplitudes, the straight-line distance and the model type. The method can improve the accuracy of GIS partial discharge positioning.

Description

Technical Field

[0001] This application relates to the field of partial discharge location technology, and in particular to a method, device, equipment and medium for rapid location of partial discharge areas in gas-insulated combined electrical appliances. Background Technology

[0002] Gas-insulated switchgear (GIS) is electrical equipment used in substations with voltage levels of 110kV and above, and is widely used in power transmission, distribution, and power control systems. Because GIS equipment uses a fully enclosed structure, insulation defects such as metal particles, conductor burrs, and installation deviations can easily enter during on-site installation and maintenance. Under the influence of the operating electric field, these defects can continuously generate partial discharges. If the internal partial discharge sources cannot be quickly and accurately located, long-term discharges will lead to insulation degradation, surface breakdown, and equipment shutdown.

[0003] Current partial discharge localization technologies for GIS equipment primarily rely on ultra-high frequency (UHF) electromagnetic wave detection. Mainstream methods include time-of-flight (TOF) methods based on signal arrival time difference, knowledge-based methods based on amplitude comparison, and combined UHF and ultrasonic localization methods. TOF methods rely on high-speed sampling equipment and precise time synchronization devices to obtain the signal propagation time difference for localization; knowledge-based methods require pre-calibration of all equipment and lines at multiple points and the establishment of an attenuation database; combined localization methods combine time-domain signal characteristics with information from multiple physical quantities for comprehensive judgment.

[0004] However, existing GIS partial discharge location methods all suffer from inaccurate positioning. Summary of the Invention

[0005] This application provides a method, apparatus, equipment, and medium for rapid partial discharge location of gas-insulated switchgear, which can improve the accuracy of partial discharge location in GIS.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, this application provides a method for rapid partial discharge location of gas-insulated switchgear, comprising: Determine adjacent sensor pairs and the straight-line distance between adjacent sensor pairs; The adjacent sensor pairs are calibrated by bidirectional pulse injection to obtain bidirectional equivalent attenuation coefficients; Based on the bidirectional equivalent attenuation coefficient, the structural symmetry determination result of the adjacent sensor for the segment is determined; Based on the structural symmetry determination result, select the model type; The actual partial discharge signals of the two sensors in the adjacent sensor pair are collected to obtain the corresponding actual partial discharge signal amplitude. The location of the partial discharge source is determined based on the bidirectional equivalent attenuation coefficient, the actual amplitude of the partial discharge signal, the straight-line distance, and the model type.

[0007] Optionally, the method further includes: The validity of the power supply is determined based on its location. When the location of the partial discharge power source is determined to be valid, the positioning error half-width is obtained based on the difference of the bidirectional equivalent attenuation coefficients, the standard deviation of the bidirectional equivalent attenuation coefficients, and the straight-line distance; the positioning range is output based on the positioning error half-width. If the location of the local discharge power source is determined to be invalid, other adjacent sensor pairs are selected again.

[0008] Optionally, determining adjacent sensor pairs includes: Among all the sensors, they are sorted from largest to smallest according to the response amplitude of the received partial discharge signal; The sensor with the largest response amplitude is selected as the first sensor; Among the sensors physically adjacent to the first sensor, the sensor with the largest response amplitude is selected as the second sensor; The first sensor and the second sensor are identified as an adjacent sensor pair.

[0009] Optionally, the step of performing bidirectional pulse injection calibration on the adjacent sensor pairs to obtain bidirectional equivalent attenuation coefficients includes: A calibration pulse of the first amplitude is injected at the first sensor, and the first response amplitude is measured at the second sensor; A calibration pulse of the second amplitude is injected at the second sensor, and the second response amplitude is measured at the first sensor; Based on the first amplitude, the first response amplitude, and the straight-line distance, calculate the first equivalent attenuation coefficient in the direction from the first sensor to the second sensor; Based on the second amplitude, the second response amplitude, and the straight-line distance, calculate the second equivalent attenuation coefficient in the direction from the second sensor to the first sensor.

[0010] Optionally, determining the structural symmetry judgment result of the adjacent sensor relative to its segment based on the bidirectional equivalent attenuation coefficient includes: Obtain the structural information of the adjacent sensor in the section; Calculate the structural symmetry coefficient based on the first and second equivalent attenuation coefficients; When the structural symmetry coefficient is less than or equal to the structural symmetry coefficient threshold, and there are no asymmetrical components in the structural information indication section, the section is determined to be a symmetrical section. When the structural symmetry coefficient is greater than the structural symmetry coefficient threshold, or when the structural information indicates that there are asymmetrical components in the segment, the segment is determined to be an asymmetrical segment.

[0011] Optionally, determining the location of the partial discharge source based on the bidirectional equivalent attenuation coefficient, the actual partial discharge signal amplitude, the straight-line distance, and the model type includes: When the model type is a symmetrical simplified model, the location of the partial discharge source is determined based on the straight-line distance, the difference in the actual partial discharge signal amplitudes of the two sensors, and the average value of the bidirectional equivalent attenuation coefficient. When the model type is a bidirectional model, the location of the partial discharge source is determined based on the straight-line distance, the difference in amplitude of the actual partial discharge signals of the two sensors, the first amplitude, the second amplitude, the first response amplitude, and the second response amplitude.

[0012] Optionally, the validity determination based on the location of the local discharge power source includes: When the location of the local discharge power source is less than zero or greater than the straight-line distance, it is determined to be invalid; Alternatively, if the absolute value of the first amplitude minus the first response amplitude plus the second amplitude minus the second response amplitude is less than the first threshold, it is determined to be invalid; Alternatively, the location of the partial discharge source can be calculated for multiple sets of actual partial discharge signals. If the difference between the maximum and minimum values ​​among the multiple partial discharge source locations is greater than the second threshold, it is determined to be invalid.

[0013] Secondly, this application provides a device for rapid partial discharge location of gas-insulated combined electrical appliances, comprising: The determination module is used to determine adjacent sensor pairs and the straight-line distance between adjacent sensor pairs; The processing module is used to perform bidirectional pulse injection calibration on the adjacent sensor pair to obtain a bidirectional equivalent attenuation coefficient; determine the structural symmetry judgment result of the section where the adjacent sensor pair is located based on the bidirectional equivalent attenuation coefficient; select the model type based on the structural symmetry judgment result; and collect the actual partial discharge signals of the two sensors in the adjacent sensor pair to obtain the corresponding actual partial discharge signal amplitude. The positioning module is used to determine the location of the partial discharge source based on the bidirectional equivalent attenuation coefficient, the actual amplitude of the partial discharge signal, the straight-line distance, and the model type.

[0014] Thirdly, this application provides a computing device, including a memory and a processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of the first aspects.

[0015] Fourthly, this application provides a computer-readable storage medium for storing a computer program for performing the method as described in any one of the first aspects.

[0016] As can be seen from the above technical solution, this application has at least the following beneficial effects: This application employs the rapid partial discharge area localization method for gas-insulated switchgear, which, after an abnormal partial discharge is triggered, determines the distance between the adjacent sensor pair with the largest response amplitude and its corresponding straight-line distance. By performing bidirectional pulse injection calibration on this adjacent sensor pair to obtain the bidirectional equivalent attenuation coefficient, and then combining the structural symmetry determination result to select a matching model type, the location of the partial discharge source is calculated using the acquired actual partial discharge signal amplitude. This process allows for calculation methods to be determined in accordance with the actual signal propagation conditions of the section, reducing positional deviations caused by uniform attenuation models, and obtaining positioning results adapted to the structure of the field equipment, thus meeting the requirements for partial discharge area localization of gas-insulated switchgear.

[0017] Furthermore, by obtaining the first and second equivalent attenuation coefficients through bidirectional pulse injection calibration, the signal transmission changes in both directions within the segment can be fully reflected. Combining structural information and structural symmetry coefficients to distinguish between symmetrical and asymmetrical segments allows the selected positioning model to match the actual structure of the equipment. Calculating the position using either a simplified symmetrical model or a bidirectional model adapts to the propagation conditions of different segments. Validity determination of the partial discharge source position eliminates calculation results that do not meet the conditions; when the position is invalid, adjacent sensor pairs are reselected, expanding the applicable range. The positioning error half-width is obtained based on the difference, standard deviation, and straight-line distance of the bidirectional equivalent attenuation coefficients, and the positioning interval is output, providing a clear view of the discharge source's location and facilitating troubleshooting by on-site personnel.

[0018] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0019] Figure 1 A schematic diagram illustrating an application scenario provided in an embodiment of this application; Figure 2 A flowchart illustrating a method for rapid partial discharge location of a gas-insulated switchgear provided in this application embodiment; Figure 3 This is a schematic diagram illustrating the principle of partial discharge power source positioning provided in an embodiment of this application; Figure 4 A schematic diagram of a rapid partial discharge location device for a gas-insulated combined electrical appliance provided in this application embodiment; Figure 5 This is a schematic diagram of a computing device provided in an embodiment of this application. Detailed Implementation

[0020] The terms "first," "second," and "third," etc., used in this application specification and accompanying drawings are used to distinguish different objects, not to limit a specific order.

[0021] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0022] To ensure clarity and conciseness in the description of the following embodiments, a brief introduction to the related technologies is given first: Gas-insulated switchgear is a type of electrical equipment that uses insulating gas as the insulating medium and integrates various high-voltage electrical components in a sealed metal casing. It is mostly used in high-voltage and ultra-high-voltage substations.

[0023] Partial discharge is a local electrical discharge phenomenon that occurs under the action of an electric field when there are defects in the internal insulation of equipment. It can reflect the insulation status and indicate potential faults.

[0024] Existing partial discharge location methods for gas-insulated switchgear suffer from significant deviations in location results, failing to obtain discharge source locations that accurately reflect actual conditions and failing to output stable and usable location ranges, thus making it difficult to meet the needs of on-site fault diagnosis.

[0025] The reason for the positioning deviation is that existing methods mostly use a uniform signal attenuation model for calculation, without obtaining the actual transmission characteristics for different equipment sections. They neglect the influence of structures such as basin insulators, elbows, tees, and disconnector breaks, resulting in significant differences in signal attenuation in different propagation directions. Furthermore, the lack of validity assessment and error range determination of the positioning results further leads to discrepancies between the positioning results and the actual location.

[0026] In view of this, embodiments of this application provide a method for rapid partial discharge location of gas-insulated combined electrical appliances, which can be executed by a processing device.

[0027] This application addresses the issue of significant deviations in partial discharge location results for gas-insulated switchgear. First, it locks the target sensor section based on the response amplitude of the abnormal partial discharge signal. Then, it obtains the actual transmission attenuation parameters of the target sensor section through bidirectional pulse injection calibration. Combining the section structure with the bidirectional attenuation difference, it determines the propagation symmetry. Based on this symmetry, it selects a suitable calculation model and uses the measured partial discharge signal amplitude to complete the location determination. Simultaneously, it assesses the validity of the results and outputs a location range including the error, ensuring the entire process closely matches the actual transmission characteristics of the section and reducing location deviations caused by mismatches between the calculation model and the structure.

[0028] To make the technical solution of this application clearer and easier to understand, the application scenarios of the technical solution of this application are described below with reference to the accompanying drawings. Figure 1 As shown in the figure, this figure is a schematic diagram of an application scenario provided by an embodiment of this application.

[0029] In this application scenario, the gas-insulated switchgear 101 is equipped with multiple ultra-high frequency sensors. The processing equipment (such as the partial discharge detection and analysis instrument 102) is connected to these ultra-high frequency sensors and can receive and process the signals collected by the ultra-high frequency sensors.

[0030] After detecting an abnormal partial discharge signal within the gas-insulated switchgear 101, the processing device acquires the adjacent sensor pair with the largest response amplitude and determines the straight-line distance between them. Next, the processing device performs bidirectional pulse injection calibration on the adjacent sensor pair to obtain a bidirectional equivalent attenuation coefficient. Subsequently, based on the bidirectional equivalent attenuation coefficient, the processing device determines the structural symmetry of the section where the adjacent sensor pair is located and selects a model type accordingly. Then, the processing device acquires the actual partial discharge signal through the sensors to obtain the corresponding actual partial discharge signal amplitude. Finally, based on the bidirectional equivalent attenuation coefficient, the actual partial discharge signal amplitude, the straight-line distance, and the selected model type, the processing device determines the location of the partial discharge source, achieving rapid localization of the partial discharge area within the gas-insulated switchgear 101.

[0031] To make the technical solution of this application clearer and easier to understand, the following application scenarios will be used to describe a method for rapid partial discharge location of gas-insulated combined electrical appliances provided in the embodiments of this application. For example... Figure 2 As shown, this figure is a flowchart of a method for rapid partial discharge location of a gas-insulated switchgear according to an embodiment of this application. In this embodiment, the method includes: S201, The processing device determines adjacent sensor pairs and the straight-line distance between adjacent sensor pairs.

[0032] Adjacent sensor pairs refer to two ultra-high frequency sensors that are physically adjacent in a gas-insulated switchgear and have no other sensors in between.

[0033] Straight-line distance refers to the distance between adjacent sensor pairs, which can characterize the transmission path length of partial discharge signals between two sensors.

[0034] In some embodiments, all sensors are sorted from largest to smallest according to the response amplitude of the received partial discharge signal; the sensor with the largest response amplitude is selected as the first sensor; among the sensors physically adjacent to the first sensor, the sensor with the largest response amplitude is selected as the second sensor; the first sensor and the second sensor are determined as an adjacent sensor pair. The obtained adjacent sensor pair can narrow down the scope of partial discharge source investigation.

[0035] The response amplitude refers to the voltage or power of the partial discharge signal received by the UHF sensor, which can reflect the signal propagation loss and the relative position of the discharge source.

[0036] Meanwhile, the processing equipment determines the straight-line distance between adjacent sensor pairs based on the equipment structure information or on-site measurement results. The straight-line distance can be used to calculate the specific location of the partial discharge source.

[0037] After acquiring adjacent sensor pairs, the processing equipment first reads the equipment ledger or design drawings of the gas-insulated switchgear to extract the installation location information of the two sensors. For example, the installation location of the first sensor is represented by a first coordinate along the axis of the equipment. The installation position of the second sensor is represented by a second coordinate along the axis of the device. The processing device calculates the absolute value of the coordinate difference between the two sensors along the device's axis to obtain the straight-line distance. This straight-line distance reflects the transmission path length of the partial discharge signal between the two sensors and can be used to determine the location of the partial discharge source.

[0038] The expression for straight-line distance is:

[0039] S202. The processing equipment performs bidirectional pulse injection calibration on adjacent sensor pairs to obtain bidirectional equivalent attenuation coefficients.

[0040] Bidirectional pulse injection calibration is an operation that injects standard calibration pulses into two sensors of an adjacent sensor pair to measure the attenuation of the signal in two transmission directions within a segment.

[0041] The equivalent attenuation coefficient refers to the proportion of signal amplitude attenuation per unit distance along the transmission path, characterizing the degree of transmission loss in that direction. The bidirectional equivalent attenuation coefficient includes a first equivalent attenuation coefficient and a second equivalent attenuation coefficient.

[0042] The first equivalent attenuation coefficient refers to the proportion of amplitude attenuation per unit distance during signal transmission from the first sensor to the second sensor, characterizing the degree of transmission loss in that direction. The second equivalent attenuation coefficient refers to the proportion of amplitude attenuation per unit distance during signal transmission from the second sensor to the first sensor, characterizing the degree of transmission loss in that direction.

[0043] In some embodiments, the processing device injects a calibration pulse of a first amplitude at a first sensor and measures a first response amplitude at a second sensor; injects a calibration pulse of a second amplitude at the second sensor and measures a second response amplitude at the first sensor; the processing device calculates a first equivalent attenuation coefficient in the direction from the first sensor to the second sensor based on the first amplitude, the first response amplitude, and the straight-line distance; and calculates a second equivalent attenuation coefficient in the direction from the second sensor to the first sensor based on the second amplitude, the second response amplitude, and the straight-line distance.

[0044] The first amplitude is the amplitude of the calibration pulse injected at the first sensor, characterizing the initial strength of the calibration signal. The first response amplitude is the amplitude of the response signal generated by the first amplitude calibration pulse, measured at the second sensor, characterizing the strength of the signal after transmission from the first sensor to the second sensor. The second amplitude is the amplitude of the calibration pulse injected at the second sensor, characterizing the initial strength of the calibration signal in the other direction. The second response amplitude is the amplitude of the response signal generated by the second amplitude calibration pulse, measured at the first sensor, characterizing the strength of the signal after transmission from the second sensor to the first sensor.

[0045] The processing device first injects a calibration pulse with a first amplitude into the first sensor, and the signal is transmitted along the device segment to the second sensor. The processing device then obtains the corresponding first response amplitude measured at the second sensor. Subsequently, the processing device injects a calibration pulse with a second amplitude into the second sensor, and the signal is transmitted in the opposite direction to the first sensor. The processing device then obtains the corresponding second response amplitude measured at the first sensor.

[0046] The calculation expressions for the first and second equivalent attenuation coefficients are as follows:

[0047]

[0048] in, This represents the first equivalent attenuation coefficient. Indicates the first value. Indicates the amplitude of the first response The arithmetic mean obtained after m repeated calibration measurements is used to reduce the impact of single measurement errors on the calculation of the attenuation coefficient. Represents the straight-line distance, characterizing the length of the signal transmission path between two sensors; This represents the second equivalent attenuation coefficient. This indicates the second value. Indicates the amplitude of the second response The arithmetic mean obtained after m repeated calibration measurements is used to reduce the impact of single measurement error on the calculation of the attenuation coefficient.

[0049] S203. The processing equipment determines the structural symmetry judgment result of the adjacent sensors in the section based on the bidirectional equivalent attenuation coefficient.

[0050] The structural symmetry determination result refers to the judgment conclusion on the symmetry of signal transmission between adjacent sensors in the segment, which characterizes the degree of influence of the segment structure on bidirectional signal transmission.

[0051] In some embodiments, the processing device acquires structural information of adjacent sensors in the segment; and calculates the structural symmetry coefficient based on the first equivalent attenuation coefficient and the second equivalent attenuation coefficient. When the structural symmetry coefficient is less than or equal to the structural symmetry coefficient threshold, and there are no asymmetrical components in the structural information indication section, the section is determined to be a symmetrical section. A symmetrical section is a section in which the difference in the attenuation characteristics of bidirectional signal transmission is within a preset range, indicating that the influence of the section structure on bidirectional signal transmission is basically consistent.

[0052] When the structural symmetry coefficient is greater than the structural symmetry coefficient threshold, or when the structural information indicates the presence of asymmetrical components within the segment, the segment is determined to be an asymmetrical segment. An asymmetrical segment is a segment in which the difference in the attenuation characteristics of bidirectional signal transmission is outside a preset range, indicating a significant difference in the impact of the segment structure on bidirectional signal transmission.

[0053] The structural information of a section refers to the component arrangement information of the section between adjacent sensor pairs in a gas-insulated switchgear, which can characterize whether there are asymmetrical components such as basin insulators, elbows, and tees in the section.

[0054] The structural symmetry coefficient is a value calculated based on the bidirectional equivalent attenuation coefficient, which characterizes the difference in attenuation characteristics of the signal in the two transmission directions of the segment.

[0055] The structural symmetry coefficient threshold is a reference value used to determine the magnitude of the structural symmetry coefficient and can be used as a basis for determining the symmetry of sections. The expression for calculating the structural symmetry coefficient threshold is:

[0056] in, This represents the threshold value for the structural symmetry coefficient. This represents the threshold variation coefficient. Indicates straight-line distance. This indicates the maximum straight-line distance between adjacent sensors in the device. This represents the base threshold.

[0057] The structural symmetry coefficient threshold increases linearly with the increase of straight-line distance to adapt to the different attenuation characteristics of different length segments and determine the requirements.

[0058] Base threshold It is the default symmetry judgment standard for the shortest length section without additional components. It reflects the benchmark value of bidirectional attenuation difference of the equipment under ideal symmetry conditions. It is determined based on the equipment's factory test data or historical operating data. Specifically, it selects a straight pipe section whose length does not exceed the shortest sensor spacing of the equipment and has no asymmetrical components such as basin-type insulators, elbows, or disconnector breaks. It statistically analyzes the difference rate of multiple sets of bidirectional equivalent attenuation coefficients and takes the upper limit of its 95% confidence interval as the basic threshold. Its value ranges from 0.05 to 0.15. The lower limit corresponds to a straight pipe section with highly stable signal attenuation characteristics, while the upper limit takes into account the small attenuation differences caused by a small amount of manufacturing tolerance and installation error, so as to avoid misjudging normal fluctuations as asymmetry.

[0059] Threshold change coefficient It is a correction coefficient characterizing the impact of segment length on attenuation difference, determining the rate of increase of the structural symmetry coefficient threshold with increasing straight-line distance. It is determined through bidirectional attenuation difference testing of straight pipe segments of different lengths in the equipment. That is, it fits the linear relationship between the attenuation difference rate and the segment length, and obtains the slope as the threshold change coefficient. Alternatively, it can be set with a reasonable change range based on the overall maximum sensor spacing of the equipment and the basic threshold to ensure that the threshold of the longest segment does not exceed the maximum reasonable attenuation difference allowed by the equipment. Its value range is from 0.1 to 0.3, where the lower limit corresponds to the scenario where the signal attenuation difference increases slowly with the length, which is suitable for equipment with stable transmission characteristics, and the upper limit corresponds to the scenario where the signal attenuation difference increases significantly with the length, which is suitable for equipment with slight manufacturing deviations or environmental influences, and avoids long straight pipe segments being misjudged as asymmetric due to normal attenuation difference.

[0060] The processing equipment first retrieves structural information about the adjacent sensor sections to obtain the component layout within those sections. For example, it checks the equipment register to see if components such as basin insulators, elbows, or disconnector breaks are installed in the sections between adjacent sensors. Then, based on the first and second equivalent attenuation coefficients, it calculates the structural symmetry coefficient. The expression for calculating the structural symmetry coefficient is as follows:

[0061] in, Represents the structural symmetry coefficient. This represents the first equivalent attenuation coefficient. This represents the second equivalent attenuation coefficient.

[0062] The processing equipment then compares the structural symmetry coefficient with the structural symmetry coefficient threshold and makes a judgment based on the segment structure information.

[0063] When the structural symmetry coefficient is less than or equal to the structural symmetry coefficient threshold, and the structural information shows that there are no asymmetrical components within the segment, the segment is determined to be a symmetrical segment. At this time, the signal attenuation difference in the two directions is within a preset range, and there are no additional components in the segment that change the signal transmission path, indicating that the signal transmission characteristics in this segment are relatively stable, and the attenuation pattern along the axial direction is basically consistent.

[0064] When the structural symmetry coefficient exceeds the structural symmetry coefficient threshold, or when the structural information indicates the presence of asymmetrical components within the section, the section is classified as an asymmetrical section. In this case, either the signal attenuation difference in the two directions is outside the preset range, or there are components such as basin insulators, elbows, or disconnector breaks within the section. These components alter the signal transmission path or cause additional losses, leading to differences in signal attenuation characteristics in the two directions. The resulting classification as a symmetrical or asymmetrical section reflects the impact of the section structure on bidirectional signal transmission.

[0065] S204. The processing equipment selects the model type based on the structural symmetry determination result.

[0066] The model types include symmetric simplified models and bidirectional models. Symmetric simplified models are computational models based on the assumption that the signal attenuation characteristics are consistent in both directions, and are suitable for symmetric sections. Bidirectional models are computational models based on the assumption that the signal attenuation characteristics differ in both directions, and are suitable for asymmetric sections.

[0067] Based on the structural symmetry determination result, the processing equipment selects the corresponding model type for the current segment. When the determination result is a symmetrical segment, a symmetrical simplified model is selected. For example, when the segment is a straight pipe segment without additional components and the difference in bidirectional attenuation characteristics is within a preset range, the processing equipment uses a symmetrical simplified model for calculation. When the determination result is an asymmetrical section, a two-way model is selected. For example, when the section contains basin insulators or elbows, the difference in two-way attenuation characteristics is not within the preset range, and the processing equipment uses a two-way model for calculation.

[0068] S205. The processing equipment collects the actual partial discharge signals of two sensors in an adjacent sensor pair and obtains the corresponding actual partial discharge signal amplitude.

[0069] The actual partial discharge signal is an ultra-high frequency electromagnetic wave generated by partial discharge inside the gas-insulated switchgear, which characterizes the discharge activity of insulation defects inside the equipment.

[0070] The actual amplitude of the partial discharge signal is the voltage or power of the partial discharge signal received by the sensor, which characterizes the intensity of the signal when it propagates to the sensor.

[0071] The processing equipment is connected to adjacent sensor pairs within the gas-insulated switchgear to acquire the actual partial discharge signals received by each sensor. After acquiring the actual partial discharge signals, the processing equipment performs signal-to-noise ratio determination and filtering on the two signals respectively.

[0072] The processing equipment first extracts the effective signal amplitude and simultaneously collects the background noise amplitude during the current period without partial discharge. The signal-to-noise ratio (SNR) is calculated by comparing the two values, and is used to measure the reliability of the partial discharge signal relative to on-site interference. A higher SNR indicates that the signal is less affected by electromagnetic interference, equipment operating noise, and casing vibration noise, resulting in higher data validity. Conversely, a lower SNR indicates that the signal is easily submerged by noise, leading to potential errors in positioning calculations. The processing equipment only considers signals with an SNR greater than a preset SNR threshold as valid signals, retaining them for subsequent amplitude extraction and positioning calculations. Signals with an SNR less than or equal to the preset SNR threshold are discarded and not included in the subsequent calculation process to avoid interference data lowering the reliability of the positioning results.

[0073] The expression for calculating the signal-to-noise ratio is:

[0074] in, Indicates the signal-to-noise ratio. This indicates the effective amplitude of the actual partial discharge signal received by the sensor. This indicates the amplitude of background noise in the current environment.

[0075] The preset signal-to-noise ratio (SNR) threshold is determined based on the on-site electromagnetic environment level, sensor sensitivity, and equipment operating conditions. It is obtained by repeatedly collecting background noise amplitude data and performing statistical analysis under normal operating conditions without partial discharge. In this embodiment, the preset SNR threshold is set to 3.

[0076] After signal-to-noise ratio (SNR) filtering, the processing device extracts the corresponding actual partial discharge signal amplitude from the valid signals. For example, when a partial discharge occurs inside the device, the two sensors will receive discharge signals transmitted through different paths. The processing device first filters out low SNR interference signals, then reads and quantizes the strength of the two valid signals to obtain the corresponding actual partial discharge signal amplitude. The obtained actual partial discharge signal amplitude reflects the relative positional relationship between the partial discharge source and the two sensors, and is used to determine the location of the partial discharge source.

[0077] S206. The processing equipment determines the location of the partial discharge source based on the bidirectional equivalent attenuation coefficient, the actual partial discharge signal amplitude, the straight-line distance, and the model type.

[0078] The location of a partial discharge source is the specific location where a partial discharge occurs within a gas-insulated switchgear unit, characterizing the spatial distribution of discharge defects.

[0079] The processing device, based on the selected model type, substitutes the bidirectional equivalent attenuation coefficient, the actual partial discharge signal amplitude, and the straight-line distance into the corresponding calculation model to solve for the location of the partial discharge source. For example, when a symmetrical simplified model is selected, the processing device uses the actual partial discharge signal amplitude and straight-line distance from the two sensors, combined with the average value of the bidirectional equivalent attenuation coefficient, to calculate the location of the partial discharge source. When a bidirectional model is selected, the processing device uses the equivalent attenuation coefficients in both directions and combines them with the amplitude difference between the two signals to calculate the location of the partial discharge source. The obtained location of the partial discharge source can be used to determine the specific location of insulation defects inside the equipment.

[0080] In some embodiments, when the model type is a symmetric simplified model, the processing device determines the location of the partial discharge source based on the straight-line distance, the difference in the actual partial discharge signal amplitudes of the two sensors, and the average value of the bidirectional equivalent attenuation coefficient.

[0081] First, the processing equipment calculates the average value of the bidirectional equivalent attenuation coefficients to obtain the overall attenuation level of the section. Then, based on the difference in the actual partial discharge signal amplitudes of the two sensors, combined with the straight-line distance and the average value of the bidirectional equivalent attenuation coefficients, the location of the partial discharge source is calculated. For example, for a straight pipe section without additional components, where the difference in attenuation characteristics in the two directions is within a preset range, the processing equipment uses a simplified calculation method to obtain the location of the partial discharge source from one of the sensors. The obtained location of the partial discharge source can be used to determine the distribution of insulation defects inside the equipment.

[0082] When the model type is a symmetric simplified model, the expression for calculating the location of the local discharge source is:

[0083] in, This indicates the location of the local discharge power source, representing the distance of the discharge power source relative to the first sensor. Indicates straight-line distance. This indicates the actual amplitude of the partial discharge signal received by the second sensor. This indicates the actual amplitude of the partial discharge signal received by the first sensor. It represents the average value of the bidirectional equivalent attenuation coefficient, characterizing the overall attenuation level of the signal within the symmetrical section.

[0084] When the model type is a bidirectional model, the processing device determines the location of the partial discharge source based on the straight-line distance, the difference between the actual partial discharge signal amplitudes of the two sensors, the first amplitude, the second amplitude, the first response amplitude, and the second response amplitude.

[0085] When the model type is bidirectional, the processing device first combines the first amplitude, the second amplitude, the first response amplitude, and the second response amplitude to obtain the equivalent attenuation coefficients for the two transmission directions. Then, it substitutes the straight-line distance, the difference in the actual partial discharge signal amplitudes of the two sensors, and the equivalent attenuation coefficients for the two directions into the bidirectional model to calculate the location of the partial discharge source. For example, when the section contains basin insulators or bends, and the difference in signal attenuation characteristics in the two directions is not within a preset range, the processing device uses the bidirectional model to simultaneously consider the attenuation patterns in different directions and calculates the distance of the partial discharge source from one of the sensors.

[0086] When the model type is a two-way model, the expression for calculating the location of the local discharge source is:

[0087] in, Indicates the location of the local power supply. This indicates the actual amplitude of the partial discharge signal received by the second sensor. This indicates the actual amplitude of the partial discharge signal received by the first sensor. This represents the first amplitude, i.e., the amplitude of the calibration pulse injected at the first sensor, characterizing the initial intensity of the calibration signal in the first direction. Indicates the amplitude of the first response The arithmetic mean was calculated after m repeated calibration measurements. This represents the second amplitude, i.e., the amplitude of the calibration pulse injected at the second sensor, characterizing the initial intensity of the calibration signal in the second direction. Indicates the amplitude of the second response The arithmetic mean is calculated after m repeated calibration measurements.

[0088] When the model type is a two-way model, the reasoning process for calculating the expression for the location of the local discharge source is as follows: The partial discharge signal propagates from the discharge source to two sensors, and the signal amplitudes received at the sensors satisfy the corresponding transmission relationship:

[0089]

[0090] Among them, formula This indicates that the partial discharge signal propagates from the discharge source to the first sensor. Indicates the location of the local power supply. Represents the second equivalent attenuation coefficient; Formula This indicates that the partial discharge signal propagates from the discharge source to the second sensor, and the propagation distance is... , This represents the first equivalent attenuation coefficient. This represents the initial signal amplitude of the partial discharge power source itself.

[0091] Eliminating the unknown initial amplitude by combining the above two equations It can be deduced that:

[0092] After further simplification and transformation of the expression, we get:

[0093] The first equivalent attenuation coefficient obtained from calibration Second equivalent attenuation coefficient By substituting the values, the formula for locating the local discharge source under the bidirectional model can be derived.

[0094] When the model type is a symmetric simplified model, the reasoning process for calculating the expression for the location of the local discharge source is as follows: When a segment is determined to be a symmetrical segment, it is considered that... and Approximately equal, take the average of the bidirectional equivalent attenuation coefficients. ,but This expression can be simplified to:

[0095] By solving and transforming the equation, we finally obtain the local discharge source location calculation formula corresponding to the symmetric simplified model.

[0096] In summary, based on the symmetry determination results of the segment, this application can adaptively match a bidirectional model or a symmetric simplified model to complete the location calculation of the local discharge source.

[0097] Figure 3 This diagram illustrates the principle of partial discharge source localization, showing the transmission relationship between the partial discharge signal and the calibration signal in a bidirectional model. In the diagram, the horizontal direction represents the straight-line distance. The left side represents the first sensor, the right side represents the second sensor, and the middle represents the partial discharge power source. The signal generated by the partial discharge power source is transmitted to both sides, forming the actual partial discharge signal amplitude received by the first sensor. The amplitude of the actual partial discharge signal received by the second sensor is generated at the second sensor end. Both signals show a decreasing trend as the transmission distance increases.

[0098] A first amplitude calibration signal injected at the first sensor is transmitted to the second sensor to form a first response amplitude; a second amplitude calibration signal injected at the second sensor is transmitted to the first sensor to form a second response amplitude. The transmission path of the calibration signal is represented by a dashed line, and its attenuation law corresponds to the attenuation characteristics of the actual partial discharge signal. It is used to obtain the bidirectional equivalent attenuation coefficient, providing basic parameters for the positioning calculation of the bidirectional model.

[0099] The method also includes: The processing equipment determines the effectiveness based on the location of the local discharge power source.

[0100] The specific process for determining validity is as follows: When the position of the local discharge power source is less than zero or greater than the straight-line distance, it is considered invalid. At this time, the calculated position exceeds the actual segment range between the two sensors and cannot be physically realized. For example, for a segment with a straight-line distance of 10 meters, if the calculated result is -1 meter or 11 meters, it is an invalid result that is out of range.

[0101] Alternatively, if the absolute value of the first amplitude minus the first response amplitude plus the second amplitude minus the second response amplitude is less than the first threshold, it is determined to be invalid; that is... If the value is less than the first threshold, it is considered invalid. At this time, the total attenuation of the calibration signal in both directions is too small, and the difference in signal attenuation cannot be effectively distinguished. The basic data for positioning calculation is not reliable. For example, if the attenuation of the calibration signal is only the noise level of the device, this condition will not be met.

[0102] Alternatively, the location of the partial discharge source can be calculated separately for multiple sets of actual partial discharge signals. When the difference between the maximum and minimum values ​​among the multiple partial discharge source locations is greater than the second threshold, it is determined to be invalid. In this case, the dispersion of the multiple location results is too large, and the location results are unstable. For example, the multiple location results of the same defect are distributed at both ends of the segment, indicating that there is an anomaly in the signal or calculation process.

[0103] In addition to the three invalid cases mentioned above, if the location of the partial discharge source is within the range of 0 to a straight line distance, the total attenuation of the calibration signal is greater than or equal to the first threshold, and the range of multiple positioning results is less than or equal to the second threshold, then the location is determined to be a valid location and can be used as the basis for locating partial discharge defects.

[0104] The first threshold is a reference value used to determine whether the attenuation of the calibration signal is effective, characterizing whether the attenuation of the calibration signal in both directions reaches a distinguishable level.

[0105] The second threshold is a reference value used to determine the consistency of multiple positioning results, representing whether the dispersion between the calculated local discharge source locations is within a reasonable range.

[0106] An invalidation decision is a negative conclusion regarding the calculation results of the partial discharge source location, indicating that the location result is not credible.

[0107] When the location of the partial discharge power source is determined to be valid, the processing device obtains the half-width of the positioning error based on the difference of the bidirectional equivalent attenuation coefficients, the standard deviation of the bidirectional equivalent attenuation coefficients, and the straight-line distance; it outputs the positioning range based on the half-width of the positioning error; when the location of the partial discharge power source is determined to be invalid, other adjacent sensor pairs are reselected.

[0108] The half-width of the positioning error characterizes the uncertainty range of the calculation result of the local discharge source position, representing the maximum deviation of the positioning result.

[0109] The positioning interval is a numerical range that includes the actual discharge source location, determined by the calculated local discharge source location and the error half-width.

[0110] The standard deviation of the bidirectional equivalent attenuation coefficient characterizes the dispersion of the two equivalent attenuation coefficient data and reflects the stability of the calibration process.

[0111] When the location of the partial discharge power source is determined to be valid, the processing equipment first calculates the positioning error half-width based on the difference in the bidirectional equivalent attenuation coefficients, the standard deviation of the bidirectional equivalent attenuation coefficients, and the straight-line distance. For example, the larger the difference in the bidirectional equivalent attenuation coefficients, the stronger the asymmetry of the section, and the greater the uncertainty of the positioning calculation; the larger the standard deviation, the worse the stability of the calibration data, and the larger the error half-width will be.

[0112] The expression for calculating the positioning error half-width is:

[0113] in, Indicates the half-width of the positioning error. The standard deviation of the bidirectional equivalent attenuation coefficient is represented by the following: This represents the difference in the bidirectional equivalent attenuation coefficients.

[0114] Subsequently, the processing device uses the calculated location of the local discharge source as the center and combines the half-width of the positioning error to output a positioning range that includes the actual location of the discharge source. This positioning range can reflect the reliability of the positioning result.

[0115] The final output positioning range is:

[0116] in, This indicates the location of the local power supply.

[0117] When the location of the partial discharge power source is determined to be invalid, it indicates that there is a problem with the data collected or the calculation process of the current adjacent sensor pair. The processing device will select other adjacent sensor pairs again and recalculate and determine the location of the partial discharge power source.

[0118] The obtained positioning range can be used to visually demonstrate the possible distribution range of partial discharge defects, while switching the sensor pair when it is invalid can avoid positioning failure caused by abnormal data in a single set, thus improving the overall positioning success rate.

[0119] Based on this, the processing equipment further scores the reliability of the effective positioning results, quantifying the reliability of the positioning results through multi-dimensional indicators to form a reliability level that can be intuitively interpreted. The reliability score is a weighted fusion calculation of four key indicators: the positioning effectiveness judgment result, the signal-to-noise ratio, the positioning error half-width, and the dispersion of multiple positioning results. The scoring range is uniformly set from 0 to 100 points. The higher the score, the less the positioning is affected by structural asymmetry, on-site noise, and data fluctuations, and the more stable the positioning result is, and the closer it is to the actual defect location. The lower the score, the higher the uncertainty of the positioning result, and the lower its reference value.

[0120] The formula for calculating the credibility score is:

[0121] in, Indicates credibility score. This represents the first weighting coefficient. This indicates the score for validity determination. This represents the second weighting coefficient. This represents the signal-to-noise ratio score. This represents the third weighting coefficient. This represents the half-width score of the positioning error. This represents the fourth weighting coefficient. This represents the dispersion score across multiple positioning operations. Each weighting coefficient is pre-set based on the on-site working conditions and positioning requirements, and the sum of all weighting coefficients is 1.

[0122] The processing equipment outputs the reliability score and the location range simultaneously, along with a scoring explanation. On-site maintenance personnel can directly determine the acceptability of the location results based on the reliability score. When the score is higher than the preset reliability score (e.g., 80 points), it indicates that the location result is stable and reliable, and can be directly used as the basis for partial discharge defect location and on-site maintenance. When the score is lower than the preset reliability score (e.g., 60 points), it indicates that there is significant uncertainty in the current location. The system automatically prompts and suggests re-performing bidirectional pulse calibration or replacing other adjacent sensor pairs before re-locating, thereby further improving the availability, safety, and maintenance efficiency of the location results.

[0123] Based on the above description, this application has the following beneficial effects: In this application, the adjacent sensor pairs with the largest response amplitudes when an abnormal partial discharge is triggered are obtained, and the straight-line distance between these adjacent sensor pairs is determined. A bidirectional pulse injection calibration is then performed on these adjacent sensor pairs to obtain bidirectional equivalent attenuation coefficients. Combined with the structural symmetry determination results, a matching model type is selected, and the actual partial discharge signal amplitude is used to determine the location of the partial discharge source. This process closely matches the actual signal propagation conditions of the section, reduces positional deviations caused by uniform attenuation models, and yields positioning results adapted to the structure of the field equipment, meeting the requirements for locating partial discharge areas in gas-insulated switchgear.

[0124] The above text combined Figure 2 The method for rapid partial discharge location of gas-insulated combined electrical appliances provided in this application embodiment has been described in detail. The apparatus and equipment provided in this application embodiment will be described below with reference to the accompanying drawings.

[0125] like Figure 4 As shown in the figure, this is a schematic diagram of a rapid partial discharge location device for a gas-insulated combined electrical appliance according to an embodiment of this application. The device includes: The determination module 301 is used to determine adjacent sensor pairs and the straight-line distance between adjacent sensor pairs; The processing module 302 is used to perform bidirectional pulse injection calibration on the adjacent sensor pair to obtain a bidirectional equivalent attenuation coefficient; determine the structural symmetry judgment result of the section where the adjacent sensor pair is located based on the bidirectional equivalent attenuation coefficient; select a model type based on the structural symmetry judgment result; and collect the actual partial discharge signals of the two sensors in the adjacent sensor pair to obtain the corresponding actual partial discharge signal amplitude. The positioning module 303 is used to determine the location of the partial discharge source based on the bidirectional equivalent attenuation coefficient, the actual amplitude of the partial discharge signal, the straight-line distance, and the model type.

[0126] Optionally, the processing module 302 is also used to determine the validity based on the location of the local power supply. When the location of the local discharge power source is determined to be valid, the positioning error half-width is obtained based on the difference of the bidirectional equivalent attenuation coefficients, the standard deviation of the bidirectional equivalent attenuation coefficients, and the straight-line distance; the positioning range is output based on the positioning error half-width. If the location of the local discharge power source is determined to be invalid, other adjacent sensor pairs are selected again.

[0127] Optionally, the processing module 302 is specifically used to sort all the sensors according to the response amplitude of the received partial discharge signal from largest to smallest. The sensor with the largest response amplitude is selected as the first sensor; Among the sensors physically adjacent to the first sensor, the sensor with the largest response amplitude is selected as the second sensor; The first sensor and the second sensor are identified as an adjacent sensor pair.

[0128] Optionally, the processing module 302 is specifically used to inject a calibration pulse of the first amplitude at the first sensor and measure the first response amplitude at the second sensor; A calibration pulse of the second amplitude is injected at the second sensor, and the second response amplitude is measured at the first sensor; Based on the first amplitude, the first response amplitude, and the straight-line distance, calculate the first equivalent attenuation coefficient in the direction from the first sensor to the second sensor; Based on the second amplitude, the second response amplitude, and the straight-line distance, calculate the second equivalent attenuation coefficient in the direction from the second sensor to the first sensor.

[0129] Optionally, the processing module 302 is specifically used to obtain the structural information of the adjacent sensor pairs in the segment. Calculate the structural symmetry coefficient based on the first and second equivalent attenuation coefficients; When the structural symmetry coefficient is less than or equal to the structural symmetry coefficient threshold, and there are no asymmetrical components in the structural information indication section, the section is determined to be a symmetrical section. When the structural symmetry coefficient is greater than the structural symmetry coefficient threshold, or when the structural information indicates that there are asymmetrical components in the segment, the segment is determined to be an asymmetrical segment.

[0130] Optionally, the processing module 302 is specifically used to determine the location of the partial discharge source based on the straight-line distance, the difference in the amplitude of the actual partial discharge signals of the two sensors, and the average value of the bidirectional equivalent attenuation coefficient when the model type is a symmetrical simplified model. When the model type is a bidirectional model, the location of the partial discharge source is determined based on the straight-line distance, the difference in amplitude of the actual partial discharge signals of the two sensors, the first amplitude, the second amplitude, the first response amplitude, and the second response amplitude.

[0131] Optionally, the processing module 302 is specifically used to determine that the local power supply position is invalid when it is less than zero or greater than the straight-line distance; Alternatively, if the absolute value of the first amplitude minus the first response amplitude plus the second amplitude minus the second response amplitude is less than the first threshold, it is determined to be invalid; Alternatively, the location of the partial discharge source can be calculated for multiple sets of actual partial discharge signals. If the difference between the maximum and minimum values ​​among the multiple partial discharge source locations is greater than the second threshold, it is determined to be invalid.

[0132] The gas-insulated combined electrical appliance partial discharge rapid area positioning device according to the embodiments of this application can correspond to the execution of the method described in the embodiments of this application, and the other operations and / or functions of each module / unit of the gas-insulated combined electrical appliance partial discharge rapid area positioning device are respectively for realizing Figure 2 For the sake of brevity, the corresponding processes of each method in the illustrated embodiments will not be described in detail here.

[0133] This application also provides a computing device. For example... Figure 5 As shown in the figure, this is a schematic diagram of a computing device provided in an embodiment of this application. The computing device 700 includes a bus 701, a processor 702, a communication interface 703, and a memory 704. The processor 702, the memory 704, and the communication interface 703 communicate with each other via the bus 701.

[0134] The 701 bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0135] The processor 702 can be any one or more of the following processors: central processing unit (CPU), graphics processing unit (GPU), microprocessor (MP), or digital signal processor (DSP).

[0136] The communication interface 703 is used for external communication.

[0137] Memory 704 may include volatile memory, such as random access memory (RAM). Memory 704 may also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0138] The memory 704 stores executable code, and the processor 702 executes the executable code to perform the aforementioned method for rapid partial discharge location of gas-insulated switchgear.

[0139] Specifically, in achieving Figure 4 In the case of the illustrated embodiment, and Figure 4 When the modules or units of the gas-insulated combined electrical appliance partial discharge rapid area positioning device described in the embodiments are implemented by software, the execution... Figure 4 The software or program code required for the functions of each module / unit can be partially or entirely stored in the memory 704. The processor 702 executes the program code corresponding to each unit stored in the memory 704 to execute the aforementioned method for rapid partial discharge location of gas-insulated combined electrical appliances.

[0140] This application also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium that a computing device can store, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to execute the aforementioned method for rapid partial discharge location of gas-insulated switchgear.

[0141] This application also provides a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, all or part of the processes or functions described in this application are generated.

[0142] The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0143] When the computer program product is executed by a computer, the computer performs any of the aforementioned methods of the rapid partial discharge area location method for gas-insulated switchgear. The computer program product can be a software installation package; when any of the aforementioned methods of the rapid partial discharge area location method for gas-insulated switchgear is required, the computer program product can be downloaded and executed on the computer.

[0144] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0145] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application.

Claims

1. A method for rapid partial discharge location of a gas-insulated combined electrical appliance, characterized in that, The method includes: Determine adjacent sensor pairs and the straight-line distance between adjacent sensor pairs; The adjacent sensor pairs are calibrated by bidirectional pulse injection to obtain bidirectional equivalent attenuation coefficients; Based on the bidirectional equivalent attenuation coefficient, the structural symmetry determination result of the adjacent sensor in the segment is determined; Based on the structural symmetry determination result, select the model type; The actual partial discharge signals of the two sensors in the adjacent sensor pair are collected to obtain the corresponding actual partial discharge signal amplitude. The location of the partial discharge source is determined based on the bidirectional equivalent attenuation coefficient, the actual amplitude of the partial discharge signal, the straight-line distance, and the model type.

2. The method according to claim 1, characterized in that, The method further includes: The validity of the power supply is determined based on its location. When the location of the local discharge power source is determined to be valid, the positioning error half-width is obtained based on the difference of the bidirectional equivalent attenuation coefficients, the standard deviation of the bidirectional equivalent attenuation coefficients, and the straight-line distance; the positioning range is output based on the positioning error half-width. If the location of the local discharge power source is determined to be invalid, other adjacent sensor pairs are selected again.

3. The method according to claim 2, characterized in that, The determination of adjacent sensor pairs includes: Among all the sensors, they are sorted from largest to smallest according to the response amplitude of the received partial discharge signal; The sensor with the largest response amplitude is selected as the first sensor; Among the sensors physically adjacent to the first sensor, the sensor with the largest response amplitude is selected as the second sensor; The first sensor and the second sensor are identified as an adjacent sensor pair.

4. The method according to claim 3, characterized in that, The bidirectional pulse injection calibration of the adjacent sensor pairs to obtain the bidirectional equivalent attenuation coefficient includes: A calibration pulse of the first amplitude is injected at the first sensor, and the first response amplitude is measured at the second sensor; A calibration pulse of the second amplitude is injected at the second sensor, and the second response amplitude is measured at the first sensor; Based on the first amplitude, the first response amplitude, and the straight-line distance, calculate the first equivalent attenuation coefficient in the direction from the first sensor to the second sensor; Based on the second amplitude, the second response amplitude, and the straight-line distance, calculate the second equivalent attenuation coefficient in the direction from the second sensor to the first sensor.

5. The method according to claim 4, characterized in that, The step of determining the structural symmetry judgment result of the adjacent sensor relative to the segment based on the bidirectional equivalent attenuation coefficient includes: Obtain the structural information of the adjacent sensor pairs in the section; Calculate the structural symmetry coefficient based on the first and second equivalent attenuation coefficients; When the structural symmetry coefficient is less than or equal to the structural symmetry coefficient threshold, and there are no asymmetrical components in the structural information indication section, the section is determined to be a symmetrical section. When the structural symmetry coefficient is greater than the structural symmetry coefficient threshold, or when the structural information indicates that there are asymmetrical components in the segment, the segment is determined to be an asymmetrical segment.

6. The method according to claim 4, characterized in that, The determination of the partial discharge source location based on the bidirectional equivalent attenuation coefficient, the actual partial discharge signal amplitude, the straight-line distance, and the model type includes: When the model type is a symmetrical simplified model, the location of the partial discharge source is determined based on the straight-line distance, the difference in the actual partial discharge signal amplitudes of the two sensors, and the average value of the bidirectional equivalent attenuation coefficient. When the model type is a bidirectional model, the location of the partial discharge source is determined based on the straight-line distance, the difference in amplitude of the actual partial discharge signals of the two sensors, the first amplitude, the second amplitude, the first response amplitude, and the second response amplitude.

7. The method according to claim 4, characterized in that, The validity determination based on the location of the partial discharge source includes: When the location of the local discharge power source is less than zero or greater than the straight-line distance, it is determined to be invalid; Alternatively, if the absolute value of the first amplitude minus the first response amplitude plus the second amplitude minus the second response amplitude is less than the first threshold, it is determined to be invalid; Alternatively, the location of the partial discharge source can be calculated for each of the multiple actual partial discharge signals. If the difference between the maximum and minimum values ​​among the multiple partial discharge source locations is greater than the second threshold, it is determined to be invalid.

8. A device for rapid partial discharge location of a gas-insulated combined electrical appliance, characterized in that, The device includes: The determination module is used to determine adjacent sensor pairs and the straight-line distance between adjacent sensor pairs; The processing module is used to perform bidirectional pulse injection calibration on the adjacent sensor pair to obtain a bidirectional equivalent attenuation coefficient; determine the structural symmetry judgment result of the section where the adjacent sensor pair is located based on the bidirectional equivalent attenuation coefficient; select the model type based on the structural symmetry judgment result; and collect the actual partial discharge signals of the two sensors in the adjacent sensor pair to obtain the corresponding actual partial discharge signal amplitude. The positioning module is used to determine the location of the partial discharge source based on the bidirectional equivalent attenuation coefficient, the actual amplitude of the partial discharge signal, the straight-line distance, and the model type.

9. A computing device, characterized in that, Including memory and processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for performing the method as described in any one of claims 1 to 7.

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