An intelligent test system for power test

Abstract

The present application relates to the technical field of power equipment test, specifically to an intelligent test system for power test, which comprises a nameplate analysis module, a channel optimization module, a path configuration module, an interference identification module and an excitation control module. In the present application, the structured analysis of electrical parameters is completed by image recognition to extract the content of the equipment nameplate, the parameter feature set is established by information such as frequency, capacity, phase number and current, the test channel screening is realized according to the matching relationship between the set frequency and the channel capacity, the path sorting mode is set in combination with the physical wiring characteristics and the phase number structure, and the response time parameter is mapped, the channel combination interference level is labeled based on the inductive interference identification mode, the channel interference in the excitation process is optimized by adjusting the excitation sequence and the grounding strategy, the distance dispersion control operation is executed in combination with the real-time judgment result, and the collaborative optimization of test path construction, interference control and excitation sequence deployment is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment testing, in particular to an intelligent power test system. BACKGROUND

[0002] The technical field of power equipment testing involves the detection and analysis of electrical performance parameters of various key power system equipment during operation, maintenance and fault diagnosis. The core tasks include measuring electrical parameters such as insulation, resistance, voltage, current, dielectric loss, and capacitance of electric motors, transformers, circuit breakers, cables, arresters, and switch devices, and conducting state assessment and life prediction in combination with test standards. This technical field covers on-site testing, laboratory testing, electrical parameter monitoring, and data recording, and is widely used in power system operation and maintenance, overhaul, engineering acceptance, and regular equipment testing. It is an important supporting technology for ensuring the safety of power grids and the reliable operation of equipment. Among them, the traditional intelligent power test system is an integrated device used for parameter detection and data recording of power equipment. The technical matters it addresses are the organization and execution of standard power test projects such as insulation test, dielectric loss measurement, and loop resistance test of power equipment under field conditions. The traditional intelligent power test system uses bridge method for dielectric loss angle measurement, steady-state current method for loop resistance test, DC high voltage method for insulation resistance test, and synchronous acquisition of voltage application and sampling for capacitance and leakage current detection. The realization means is based on portable test devices, combined with multi-channel sampling circuits and automatic discrimination logic to complete data acquisition and test process control.

[0003] In the existing technology, there is a lack of structured identification means for nameplate information during the execution of power equipment testing, resulting in the need for manual judgment of parameter adaptability for test channel configuration, and the electrical parameter measurement path is not set in combination with the physical layout and response characteristics of the channel, causing high randomness in path selection, unstable test timing, lack of detection and dynamic regulation mechanism for interference relationship between channels in multi-channel concurrent scenarios, and easy occurrence of induced interference superposition affecting parameter reading accuracy. When the channel excitation sequence is fixed, there is a problem of data deviation caused by the induction coincidence of adjacent channels. The unified grounding setting cannot distinguish the interference level, leading to an increase in current crosstalk risk. SUMMARY

[0004] In order to solve the technical problems in the prior art that there is no structured identification means for the nameplate information, the test channel configuration needs to rely on manual judgment of parameter adaptability, the electric parameter measurement path is set without considering the physical layout and response characteristics of the channel, the path selection has high randomness, the test timing is unstable, in the multi-channel concurrent scene, there is no detection and dynamic regulation mechanism for the interference relationship between channels, the parameter reading accuracy is easily affected by the superimposed induction interference, when the channel excitation sequence is fixed, the adjacent channel induction overlap causes data deviation, and the unified grounding setting cannot distinguish the interference level, thereby increasing the current crosstalk risk, the embodiment of the present application provides an intelligent test system for power test.

[0005] In one aspect, an intelligent test system for power test is provided, which comprises:

[0006] The nameplate analysis module obtains the nameplate image content of the power equipment, matches the frequency field with the standard frequency point table, completes the frequency characteristic positioning, extracts the capacity field content and uniformly converts it into kilovolt-ampere value, extracts the phase number field content and classifies it into single-phase, two-phase or three-phase structure, and generates a nameplate parameter structure vector group;

[0007] The channel optimization module matches the set frequency point information in the power test according to the nameplate parameter structure vector group, extracts the frequency matching channel number, sorts the capacity value and the execution amplitude difference in the channel load capacity list according to the capacity value, and generates a target test channel set;

[0008] The path configuration module calls the target test channel set, confirms the structure of the required number of test channels according to the physical layout distance corresponding to the channel number and the wiring interval list between channels, combines the phase number classification, and generates a path sequence configuration result;

[0009] The interference identification module uses the number marked as the excitation starting channel in the path sequence configuration result, applies a fixed pulse width excitation current signal in the no-load state, and collects the induction current response signal amplitude of the adjacent number channel, and generates a test path interference identification map.

[0010] As a further scheme of the present application, the nameplate parameter structure vector group includes frequency characteristic category, capacity value standard, phase number structure classification, and rated current ampere value, the target test channel set includes frequency matching channel number, load capacity proximity number, and redundant path number, the path sequence configuration result includes wiring sequence list, time offset value, and channel response mapping relationship, and the test path interference identification map includes current amplitude ratio annotation, excitation time difference mark, and interference level combination.

[0011] As a further scheme of the present application, the nameplate analysis module comprises:

[0012] The image data extraction submodule obtains the image content of the power equipment nameplate, scans the image area frame by frame and removes blurred images, extracts the text area image using a text area detection instruction, divides the independent field area according to the character connectivity judgment instruction, compares the spatial positions of the four types of label texts of frequency, capacity, phase number and current with the corresponding value pairs according to the character arrangement positions in the field area, and generates a field image mapping result;

[0013] The field feature processing submodule cuts the character boundary area based on the field image mapping result, obtains the character structure code, maps it to the corresponding digital symbol sequence, performs frequency point matching according to the extracted frequency value against the standard frequency point interval table, calls the image area marked as the capacity field to perform the same operation, uniformly converts the extracted capacity value into kilovolt-ampere value, obtains the power frequency standard matching point and kilovolt-ampere capacity value pair, and generates the nameplate parameter structure vector group.

[0014] The structure state recognition submodule calls the image areas marked as the phase number field and the rated current field according to the power frequency standard matching point and kilovolt-ampere capacity value pair, performs character matching on the phase number value in the character sequence and compares it with the preset phase number structure classification information, divides it into single-phase, two-phase or three-phase structure types, extracts the rated current character sequence and uniformly converts it into an ampere value, and generates the nameplate parameter structure vector group.

[0015] As a further scheme of the application, the channel optimization module comprises:

[0016] The frequency point constraint screening submodule calls the channel set frequency point information set based on the nameplate parameter structure vector group, performs frequency value comparison operation on the channel set frequency point, sets the frequency tolerance interval as the frequency matching reference value interval, records the numbers of the channels that match successfully, generates a frequency matching channel number list, and performs the following steps.

[0017] The channel load difference calculation submodule calls the number load values in the frequency matching channel number list, uses the per-channel capacity difference calculation instruction to calculate the amplitude difference between the capacity value and the channel load value, sorts the difference values in ascending order, and obtains a capacity difference sorting result.

[0018] The redundant channel screening submodule calls the channel number sequence in the capacity difference sorting result, compares it with the frequency matching channel number list, uses the channel number intersection matching judgment method to compare and screen the number list, retains the numbers that exist in both lists as the screening channel numbers, retains the first six numbers in the difference value sorting order, generates a limited condition screening channel number set, and performs the following steps.

[0019] The target channel submodule generates a target test channel set according to the limited condition screening channel number set, establishes a channel attribute mapping according to the channel number structure, calls the channel set frequency point information and load capacity value for number comparison and merging, and performs the following steps.

[0020] As a further scheme of the present application, the path configuration module comprises:

[0021] The channel structure identification submodule calls the channel number in the target test channel set, combines the phase number classification result included in the nameplate parameter structure vector group, confirms the number of channel numbers according to the channel number configuration rule corresponding to the phase number type, obtains the corresponding value of the channel number in the physical layout distance and wiring interval list, arranges the channel numbers of the confirmed number in ascending order of the number, and generates a phase number constraint channel sequence list;

[0022] The path sequence arrangement submodule calls the wiring interval value and the physical layout distance value of the corresponding channel number according to the channel number sequence in the phase number constraint channel sequence list, constructs an offset length sequence according to the number index sequence and the layout data, calculates the time sequence offset value combined with the set path propagation relationship, and generates a channel path offset time sequence;

[0023] The response cycle mapping submodule calls the channel path offset time sequence, performs matching operation on each group of offset time values and the response cycle of the corresponding channel number in the channel response cycle list, adjusts the channel number sequence structure, and generates a path sequence configuration result.

[0024] As a further scheme of the present application, the process of confirming the number of channel numbers according to the channel number configuration rule corresponding to the phase number type is: when the phase number classification result is three-phase, the number of confirmed channel numbers is 3;

[0025] When the phase number classification result is single-phase, the number of confirmed channel numbers is 1;

[0026] After the number of channel numbers is confirmed, when the corresponding value of the channel number in the physical layout distance and the wiring interval list is extracted, the value threshold range of the wiring interval and the physical layout distance is set to not more than 10 mm and not more than 100 mm respectively, and the channel number is retained only when the value threshold condition is met;

[0027] The process of constructing an offset length sequence according to the number index sequence and the layout data is: taking the minimum value of the channel number as the starting index position, the physical layout distance difference value corresponding to each channel number in the ascending order of the number as the difference value between adjacent elements in the offset length sequence as input;

[0028] In the process of performing matching operation on each group of offset time values and the response cycle of the corresponding channel number in the channel response cycle list, when the offset time value is greater than the upper limit of the response cycle of the corresponding channel number by 20%, the channel number sequence structure is adjusted so that the corresponding channel response cycle error is within ±10%.

[0029] As a further scheme of the present application, the interference identification module comprises:

[0030] The excitation signal injection submodule calls the number marked as the excitation starting channel in the path sequence configuration result, applies a pulse-width excitation current signal with set parameters to the channel in an idle state, records a starting excitation timestamp, and performs synchronous response channel marking on the channel numbers adjacent in the path sequence, to generate an excitation channel and response channel mapping set;

[0031] The current response extraction submodule collects a current signal sequence in the response channel within the excitation signal duration according to the excitation channel and response channel mapping set, extracts a response current amplitude corresponding to a peak amplitude point and a response time point, calculates a current amplitude ratio of the response channel corresponding to the excitation channel amplitude, and calculates a time difference between the excitation timestamp and the response time point, to generate a channel pair current amplitude ratio and excitation time difference value table;

[0032] The interference level labeling submodule calls the amplitude ratio in the channel pair current amplitude ratio and excitation time difference value table, performs amplitude comparison operation on the channel pair ratio and a set inductance interference level standard ratio, screens channel pair combinations higher than the standard ratio, and marks the corresponding channel pairs in the original path number structure, to generate a test path interference identification map.

[0033] As a further scheme of the present application, in the process of applying a pulse-width excitation current signal with set parameters to the channel in an idle state, the set parameters are a periodic pulse waveform with a pulse width value not less than 100 microseconds and a current amplitude between 2 amperes and 5 amperes;

[0034] The process of marking the synchronous response channels on the channel numbers adjacent in the path sequence comprises: when a physical layout distance value of the adjacent channel numbers and a layout distance difference value of the excitation starting channel do not exceed 30 millimeters, the adjacent channel numbers are determined as synchronous response channels and are included in the excitation channel and response channel mapping set;

[0035] In the process of extracting, by the current response extraction submodule, a response current amplitude corresponding to a peak amplitude point and a response time point, the peak value identification criterion comprises that a local peak value in a response current signal sequence is greater than twice an average value and an interval with a rising edge is less than 50 microseconds;

[0036] In the process of calling, by the interference level labeling submodule, the amplitude ratio in the channel pair current amplitude ratio and excitation time difference value table, the inductance interference level standard ratio is set to 0.3, and only the channel pairs with an amplitude ratio greater than the standard ratio are marked with channel numbers.

[0037] As a further scheme of the present application, the system further comprises an excitation control module:

[0038] The excitation regulation module adjusts the corresponding excitation sequence to a non-continuous sequence based on the channel pair combination marked as high interference level in the test path interference identification map, reads the ground setting value corresponding to the channel, switches the original channel ground state to local shielding ground, detects the frequency interval value of the channel pair in real time, judges whether the frequency interval is lower than the induction coincidence reference difference, if yes, performs discrete adjustment on the frequency interval, updates the excitation sequence table and the ground setting table, and generates a test channel excitation control list.

[0039] The test channel excitation control list includes non-continuous excitation sequence, local ground setting and frequency discrete adjustment parameter.

[0040] As a further scheme of the present application, the excitation regulation module comprises:

[0041] The excitation sequence adjustment submodule extracts the position index of the channel number in the original excitation sequence based on the channel pair combination marked as high interference level in the test path interference identification map, re-distributes the adjacent channel pairs in the non-continuous position of the excitation sequence by using the jump number rearrangement method, constructs the rearranged channel number sequence structure, and generates an interference avoidance excitation sequence table.

[0042] The ground mode switching submodule calls the channel number in the interference avoidance excitation sequence table, reads the ground setting value corresponding to the number, performs ground mode modification operation on the channel marked as general ground state in the original setting, uniformly updates to local shielding ground state, and generates a shielding ground setting table.

[0043] The frequency interval detection submodule calls the channel pair combination with the same number in the shielding ground setting table, collects the excitation frequency value and calculates the frequency interval between the channels, compares the frequency difference between the channels with the induction coincidence reference difference, judges whether there is a frequency interval lower than the reference difference, marks the channel pair meeting the condition, and generates a frequency interval abnormal channel pair list.

[0044] The control parameter update submodule performs interval opening operation on the frequency value according to the channel number combination recorded in the frequency interval abnormal channel pair list, constructs the adjusted frequency distribution structure, and synchronously updates the excitation sequence and the ground state corresponding to the frequency distribution structure, and generates a test channel excitation control list.

[0045] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0046] The electrical parameter structured analysis is completed by extracting the content of the equipment nameplate through image recognition, a parameter feature set is established through frequency, capacity, phase number, current and other information, test channel screening is realized according to the matching relationship between the set frequency point and channel capacity, the path sorting mode is set in combination with the physical wiring characteristics and the phase number structure, and the response time parameter is mapped, the channel combination interference level is labeled based on the inductive interference identification mode, the channel interference in the excitation process is optimized by adjusting the excitation sequence and grounding strategy, the result execution distance dispersion control operation is realized in real time in combination with the frequency spacing, the collaborative optimization of test path construction, interference control and excitation sequence deployment is realized, and the matching of parameter acquisition, the accuracy of path control and the stability of channel excitation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0048] Figure 1 It is a schematic diagram of an intelligent test system for power test provided by the embodiment of the present application;

[0049] Figure 2 It is a schematic diagram of the system framework of the present application;

[0050] Figure 3 It is a flowchart of the nameplate analysis module in the present application;

[0051] Figure 4 It is a flowchart of the channel optimization module in the present application;

[0052] Figure 5 It is a flowchart of the path configuration module in the present application;

[0053] Figure 6 It is a flowchart of the interference identification module in the present application;

[0054] Figure 7 It is a flowchart of the excitation control module in the present application. DETAILED DESCRIPTION

[0055] The technical solutions in the present application will be described in combination with the drawings.

[0056] In the embodiments of the present application, the words such as "exemplary", "for example", etc. are used to represent an example, illustration, or description. Any embodiment or design scheme described as "exemplary" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "exemplary" is intended to present the concept in a specific manner. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0057] In the embodiments of the present application, "image" and "picture" can be used interchangeably at times, and it should be pointed out that the meanings expressed are consistent when the distinction is not emphasized. "Of", "corresponding" and "corresponding" can be used interchangeably at times, and it should be pointed out that the meanings expressed are consistent when the distinction is not emphasized.

[0058] In the embodiments of the present application, sometimes the subscript such as W1 can be written in the form of non-subscript such as W1, and the meanings expressed are consistent when the distinction is not emphasized.

[0059] In order to make the technical problems, technical schemes and advantages to be solved by the present application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0060] The embodiments of the present application provide an intelligent test system for power test, such as Figures 1-2 The intelligent test system for power test is shown in the schematic diagram of the intelligent test system for power test, and the system comprises:

[0061] The nameplate analysis module obtains the nameplate image content of the power equipment, matches the power frequency standard frequency point table after extracting the frequency field, completes the frequency feature positioning, extracts the capacity field content and uniformly converts it into kilovolt-ampere value, extracts the phase number field content and classifies it into single-phase, two-phase or three-phase structure, converts the rated current field into ampere value after extraction, and generates a nameplate parameter structure vector group;

[0062] The channel optimization module matches the channel set frequency point information in the power test according to the nameplate parameter structure vector group, extracts the frequency matching channel number, sorts the capacity value and the execution amplitude difference in the channel load capacity list according to the capacity value, screens the channel numbers with close load capacity difference amplitude, takes the frequency matching result as a limiting condition, selects the load capacity close number as a redundant path, and generates a target test channel set;

[0063] The path configuration module calls a target test channel set, and according to a physical layout distance corresponding to a channel number and a channel-to-channel wiring interval list, in combination with a phase number classification, performs structural confirmation on a required number of channels for testing, extracts a corresponding number of channels in the selected channels, sorts the path order list after the number, sets an order offset time value according to a wiring distance, performs corresponding comparison and mapping arrangement on the offset time value and a channel response period list, and generates a path order configuration result;

[0064] The interference identification module uses the number marked as the excitation starting channel in the path order configuration result, applies a fixed pulse width excitation current signal in an unloaded state, collects an induced current response signal amplitude of adjacent numbered channels, extracts a current amplitude ratio between the excitation channel and the adjacent channel and an excitation time difference, labels a channel combination with an amplitude ratio higher than a standard ratio of an inductance interference level, and generates a test path interference identification map;

[0065] The excitation control module adjusts the corresponding excitation order to a non-continuous sequence based on the channel pair combination marked as high interference level in the test path interference identification map, reads the corresponding grounding setting value of the channel, switches the original channel grounding state to local shielding grounding, detects the frequency spacing value of the same group of channels in real time, judges whether the frequency spacing is lower than the induced coincidence reference difference, if so, performs discrete adjustment on the frequency spacing, updates the excitation order table and the grounding setting table, and generates a test channel excitation control list;

[0066] The nameplate parameter structure vector group includes a frequency characteristic category, a capacity numerical standard, a phase number structure classification, and a rated current ampere value. The target test channel set includes a frequency matching channel number, a load capacity close number, and a redundant path number. The path order configuration result includes a wiring order list, a time offset value, and a channel response mapping relationship. The test path interference identification map includes a current amplitude ratio label, an excitation time difference mark, and an interference level combination. The test channel excitation control list includes a non-continuous excitation order, a local grounding setting, and a frequency discrete adjustment parameter.

[0067] Specifically, as shown in Figure 2 , 3 The nameplate analysis module includes:

[0068] The image data extraction sub-module obtains the image content of the nameplate of the power equipment, performs frame-by-frame scanning on the image area and removes blurred images, extracts the text area image using a text area detection instruction, divides the independent field area according to the character connectivity judgment instruction, compares the spatial positions of the four types of label texts and corresponding value pairs of frequency, capacity, phase number and current according to the character arrangement positions in the field area, and generates a field image mapping result.

[0069] The image is scanned frame by frame, and the continuous image sequence obtained by the high-speed industrial camera is used. Each frame of image is loaded into the cache and screened by the image definition evaluation standard. The image sharpness judgment method is used to identify whether it is a blurred image. It is set whether the character edge in the image is clear, whether there is obvious motion trail or focus deviation. If a frame of image does not have identifiable characteristics, it is marked as invalid image and rejected. The effective image will enter the text area extraction process. At this time, a deep learning text detection model such as a character positioning network based on convolutional neural network can be used to detect the region including text in the image. After detecting the frame region including text, the image block is intercepted. Then, the character connectivity judgment method is used to analyze the connection relationship between characters based on pixel connectivity domain analysis. It is judged whether it belongs to the same field region. When the characters maintain a certain spacing rule in spatial arrangement, they will be classified into the same field. The "frequency" and the corresponding value "50Hz" are set. If they are arranged closely and are not interfered with the remaining characters, they can form a field pair. The spatial coordinate information of the field pair in the image is recorded. The relative position in the image is used to match the label and the value. The field image mapping result is generated.

[0070] Based on the field image mapping result, the character boundary region is divided. After the character structure code is obtained, it is mapped to the corresponding numerical symbol sequence. The frequency point matching is performed according to the extraction frequency value and the standard frequency point interval table. The image region marked as the capacity field is called to perform the same operation. After the capacity value is extracted, it is uniformly converted into the kilovolt-ampere value. The power frequency standard matching point and the kilovolt-ampere capacity value pair are obtained.

[0071] Each field region in the image needs to be operated for character segmentation. The character spacing judgment method or the vertical projection segmentation method is used for character positioning. When the field content is "50Hz" or "400kVA" which is a closely arranged character combination, the system will first identify the character edge or the pixel density change position, and cut it into a single character block according to the vertical division line. Then, the character block is subjected to character coding conversion. This step can extract the character structure code based on the geometric features of the character image. The character width-height ratio, stroke number and direction and other features are set. Through coding and comparison and matching with the preset character dictionary, the corresponding numerical or symbol sequence is gradually generated. The recognized character value will judge the type of the field. For example, "50Hz" is recognized as a frequency field. Whether it is in the effective power frequency range is judged by comparing the frequency interval standard list. If it is recognized as "400kVA", it needs to be uniformly converted into kilovolt-ampere unit. When non-standard units such as "400kW" or "0.4MW" are recognized, the system will automatically complete the unit conversion, so that the capacity field output is in the kilovolt-ampere unit format. The power frequency standard matching point and the kilovolt-ampere capacity value pair are obtained.

[0072] The structure state identification submodule calls the image area marked as the phase number field and the rated current field according to the power frequency standard matching point and the kilovolt-ampere capacity value pair, performs character matching on the phase number value in the character sequence and compares the preset phase number structure classification information, divides into single-phase, two-phase or three-phase structure types, extracts the rated current character sequence and uniformly converts it into an ampere value, and generates a nameplate parameter structure vector group;

[0073] The phase number field and the rated current field image area need to be processed, and the operation process is the same as the aforementioned character recognition method. The character edge detection is performed on the phase number field image, and the structure feature coding and dictionary matching are performed on the segmented characters. After the character "three" is recognized, it is matched as the number 3, and according to the set classification standard, it is corresponded to a three-phase structure. If the recognition result is "1", it is divided into a single-phase structure. The structure classification needs to be classified and set according to the general marking rules of the equipment nameplate. When recognizing the rated current field, the character recognition process extracts "25A" or "0.025kA" in different formats. The system uniformly converts the unit, extracts the uniform ampere value for parameter classification, and the above recognition field data is combined into a nameplate parameter structure vector group.

[0074] Specifically, as shown in Figure 2 、 4 , the channel optimization module includes:

[0075] The frequency point constraint screening submodule calls the channel set frequency point information set based on the nameplate parameter structure vector group, performs frequency value comparison operation on the channel set frequency point, sets the frequency tolerance interval as the frequency matching reference value interval, records the channel number of the matching success, and generates a frequency matching channel number list;

[0076] According to the frequency value field extracted from the equipment, "50Hz" or "60Hz" is set, the preset channel set frequency point information set is called, the information set includes multiple channel numbers and corresponding frequency values, channel 01 is set to 49.8Hz, channel 02 is set to 50.1Hz, channel 03 is set to 60.2Hz, etc. The frequency tolerance interval is set as the comparison reference value interval. If the set tolerance is ±0.3Hz, the matching interval of the frequency value of 50Hz is 49.7Hz to 50.3Hz. The system compares the set channel frequency one by one to determine whether it falls within the tolerance interval. If the condition is met, the channel number is recorded as the matching successful channel number. Channels 01 and 02 fall within the tolerance range, and channel 03 exceeds the upper limit and is not counted. A frequency matching channel number list is generated.

[0077] The channel load difference calculation submodule calls the number load value in the frequency matching channel number list, uses the per-channel capacity difference calculation instruction, calculates the amplitude difference value between the capacity value and the channel load value, and sorts the difference value in ascending order to obtain the capacity difference sorting result.

[0078] Extract the real-time load value of each matching channel, which can be obtained from online monitoring equipment or a recorded parameter library. Set the current load of channel 01 to 380kVA and channel 02 to 420kVA. Compare the difference between the load value of each channel and the capacity field value in the equipment nameplate. Set the capacity marked on the nameplate to 400kVA. Then the difference for channel 01 is |380-400|=20kVA, and the difference for channel 02 is |420-400|=20kVA. Perform the same operation on the matching channels in sequence and calculate the capacity difference. The capacity difference results are recorded in an array. Perform an ascending sort operation on the array to arrange the capacity differences from smallest to largest. Record the corresponding channel number order during the sorting process. Set the sorting by difference to channel 05 (10kVA), channel 01 (20kVA), channel 02 (20kVA), channel 06 (30kVA), etc., to obtain the capacity difference sorting results.

[0079] The redundant channel filtering submodule calls the channel number sequence in the capacity difference sorting result, compares it with the frequency matching channel number list, uses the channel number intersection matching judgment method to compare and filter the number list, retains the number that exists in both lists as the filtered channel number, retains the first six numbers in the difference sorting order, and generates a set of channel number filtering with constraints.

[0080] The system performs a filtering operation by analyzing the intersection between the capacity difference sorting results and the frequency matching channel number list. It extracts the channel number sequence from the capacity difference sorting results, compares the sequence with the frequency matching channel number list, and uses a channel number intersection judgment method. Only channel numbers that exist in both lists are retained as initial filtering channel numbers. For example, if the frequency matching channel is [01, 02, 05, 06] and the capacity sorting result number is [05, 07, 02, 01, 09], then the intersection number is [05, 02, 01]. At this point, the first six channel numbers are retained according to the original capacity difference sorting order. If there are fewer than six, the existing number is output, retaining [05, 02, 01] as the filtering channel number, thus generating a set of channel numbers for filtering based on constraints.

[0081] The target channel submodule filters the channel number set according to the constraints, establishes a channel attribute mapping according to the channel number structure, calls the channel set frequency point information and load capacity value to compare and merge the numbers, and generates the target test channel set.

[0082] The structured analysis is performed on each channel number in the number set, and a channel attribute mapping table is constructed according to the format, segmentation rule or hierarchical identification of the number. The channel number "CH-05-A" can be disassembled into the main number 05 and the segmentation identifier "A". The system identifies the physical group, position segment or wiring category of the channel. For each channel number, the set frequency value is extracted from the set channel frequency information library, such as the set frequency of CH-05-A being 49.8 Hz. At the same time, the corresponding load capacity value is read from the device archive or operating parameters, such as the rated load capacity being 400 kVA. The system performs field-level comparison and merging of the channel number, frequency value and load capacity value, forming a structured pair of channel number→[frequency, load]. The same operation is performed on each number in turn. Each channel includes a structural attribute identifier, a frequency setting parameter and a load capacity indicator, which provides a data basis for processes such as excitation configuration, path ordering and interference detection, and generates a target test channel set.

[0083] Specifically, as shown in Figure 2 、 5 , the path configuration module includes:

[0084] The channel structure identification submodule calls the channel numbers in the target test channel set, combines the phase number classification results included in the nameplate parameter structure vector group, performs number quantity confirmation according to the phase number type corresponding channel number configuration rule, obtains the corresponding value of the channel number in the physical layout distance and wiring interval list, arranges the channel numbers of the confirmed number in ascending order of number, and generates a phase number constrained channel sequence list;

[0085] Each channel number information in the target test channel set is called, and the nameplate parameter structure vector group associated therewith is read, especially the phase number classification result. The classification result indicates that the device is a single-phase, two-phase or three-phase power structure. The system performs number quantity confirmation according to the set channel number configuration rule. For a three-phase structure, 3 channel numbers are configured, and for a single-phase structure, 1 channel number is configured. If the target channel set includes channel numbers [03, 07, 12, 14] and the nameplate phase number identification is a three-phase structure, the system will select any three channel numbers from them for the subsequent process. After selecting the channel numbers, the system queries the layout distance and wiring interval value corresponding to the number in the channel physical layout information library. The distance of channel 03 is set to 1.5 m and the interval is 0.2 m. The distance of channel 07 is 1.7 m and the interval is 0.25 m. The distance of channel 12 is 1.6 m and the interval is 0.22 m. After extraction, the system rearranges the channel sequence in ascending order of number. In this example, it is adjusted to [03, 07, 12], and a phase number constrained channel sequence list is generated.

[0086] The path order arrangement submodule calls the wiring interval value and the physical layout distance value corresponding to the channel number in the channel number order constraint channel order list, constructs an offset length sequence according to the number index order and the layout data, calculates a time sequence offset value in combination with a set path propagation relationship, and generates a channel path offset time sequence;

[0087] The corresponding wiring interval value and the physical layout distance value are called for each channel number, the system constructs the corresponding wiring offset length sequence according to the index order of the number, the number order is set as [03, 07, 12], the physical layout distance is 1.5 m, 1.7 m and 1.6 m respectively, and the wiring interval is 0.2 m, 0.25 m and 0.22 m, the system is arranged and combined into a wiring path offset structure according to the number sequence, the propagation time is calculated according to the set path propagation relationship, the propagation relationship is set based on the propagation delay per meter, the propagation delay of the wiring cable is set as 5 ns / m, the time offset generated by the offset path is the distance multiplied by the propagation delay, the offset of channel 03 is set as 1.5 m x 5 ns = 7.5 ns, the offset of channel 07 is 8.5 ns, and the offset of channel 12 is 8.0 ns, and a channel path offset time sequence is generated.

[0088] The response period mapping submodule calls the channel path offset time sequence, matches each group of offset time values with the response period of the corresponding channel number in the channel response period list, adjusts the channel number order structure, and generates a path order configuration result;

[0089] Each group of offset time values is matched with the corresponding channel number in the channel response period list one by one, the response period represents the period value of each channel in the signal response test, the response period of channel 03 is set as 100 ns, the response period of channel 07 is set as 102 ns, and the response period of channel 12 is set as 101 ns, the system performs offset value matching operation, calculates whether there is a deviation exceeding limit condition between the offset time value and the response period, if the offset period is inconsistent, the channel number structure is adjusted in sequence, if the channel changes little in the response period order, it is arranged in front, and if the channel changes a lot, it is arranged later, the number order optimization matching is realized in this way, and a path order configuration result is generated.

[0090] Specifically, as shown in Figure 2 , 6 The interference recognition module includes:

[0091] The excitation signal injection submodule calls the number marked as the excitation starting channel in the path order configuration result, applies a pulse width excitation current signal of a set parameter to the channel in an idle state, records a starting excitation time stamp, and synchronously marks the channel numbers arranged adjacent to the number in the path order as response channels, and generates an excitation channel and response channel mapping set;

[0092] The number marked as the excitation starting channel is identified, the channel number 03 is set as the starting excitation channel, the system will inject a pulse width excitation current signal with a set parameter under the condition that the channel is in an empty state, the applied excitation signal has a clear current amplitude, duration and pulse shape, such as a single period excitation current with a pulse width of 20 microseconds and an amplitude of 10 amperes, while the excitation is applied, the system records the starting time stamp of the current signal as T0, at this time, the channel numbers adjacent to the starting channel in the path sequence are marked in response, the path sequence is set as [03, 07, 12], then 07 and 12 after 03 are marked as response channels, and a mapping set of excitation channels and response channels is generated.

[0093] The current response extraction submodule extracts the peak amplitude point corresponding to the response current amplitude and the response time point according to the excitation channel and response channel mapping set, calculates the ratio of the current amplitude of the response channel to the amplitude of the excitation channel, and calculates the time difference between the excitation time stamp and the response time point to generate a table of channel pair current amplitude ratio and excitation time difference value;

[0094] The current signal of the response channel is collected in real time within the duration of the excitation signal, the system starts the sampling process from the starting excitation time stamp T0, and collects the complete current response waveform of each response channel, the current signals collected by channel 07 and channel 12 are both instantaneous change waveforms, the system uses a peak detection method to extract the maximum current value as the amplitude point in each current sequence, and records the corresponding time of the amplitude point, the extraction results are as follows: channel 07 is 8.2A and the response time is T1=23 microseconds, channel 12 is 7.6A and T2=25 microseconds, the system calculates the ratio of the current amplitude of the response channel to the current amplitude of the excitation channel, sets the amplitude ratio of channel 07 to 0.82 and the amplitude ratio of channel 12 to 0.76 under the excitation current of 10A, and calculates the time interval between the excitation time stamp T0 and each response time point T1, T2 to form the time difference value, such as T1-T0=23μs and T2-T0=25μs, the ratio and the time difference of each channel pair are recorded in the table to generate a table of channel pair current amplitude ratio and excitation time difference value.

[0095] The interference level labeling submodule calls the amplitude ratio in the table of channel pair current amplitude ratio and excitation time difference value, performs amplitude comparison operation on the channel pair ratio and the set inductance interference level standard ratio, screens the channel pair combinations higher than the standard ratio, and marks the corresponding channel pairs in the original path number structure to generate a test path interference identification map.

[0096] The amplitude comparison operation is performed on the amplitude ratio of each pair of channels, and the screening judgment is performed with reference to the pre-set inductive interference level standard. The set ratio standard is set to 0.7, and the system judges whether the ratio of each channel pair is higher than the standard. If it is higher, it is determined that the channel pair combination has a significant interference response. For example, if the ratio of the channel pair [03→07] is 0.82, which is higher than the standard, it is included in the screening result set. Then, the system marks the channel pairs that meet the screening conditions in the original path order number structure. The marking symbol “★” or color code is set in the pass number table to indicate that the channel pair has an interference characteristic. An interference identification map of the test path is generated.

[0097] Specifically, as shown in Figure 2 、 7 The excitation control module includes:

[0098] The excitation order adjustment submodule extracts the position index of the channel number in the original excitation order based on the channel pair combination marked as high interference level in the interference identification map of the test path. The adjacent channel pairs are redistributed in non-continuous positions in the excitation sequence using the jump number rearrangement method. The rearranged channel number order structure is constructed, and the interference avoidance excitation order table is generated.

[0099] The arrangement order position of each pair of numbers in the original excitation sequence is extracted to form a corresponding number position index list. The positions of the channel pairs [03→07] and [07→12] in the original order are set to the first and second pairs. The system uses the jump number rearrangement strategy to redistribute the originally arranged adjacent interference channels to non-adjacent positions in the excitation sequence, such as arranging 03, 07, and 12 to the first, fourth, and sixth positions, respectively. The rearranged order ensures that the high-interference channels no longer interfere with each other, while satisfying the integrity of the path structure. The system maintains the path start and end number boundaries unchanged during the rearrangement process to avoid path breakage. The interference avoidance excitation order table is generated.

[0100] The ground mode switching submodule calls the channel numbers in the interference avoidance excitation order table, reads the ground setting value corresponding to the number, and performs a ground mode modification operation on the channels marked as general ground state in the original setting. The channels are uniformly updated to the local shielding ground state, and the shielding ground setting table is generated.

[0101] The ground setting value corresponding to the number in the hardware configuration library is read. If it is found that the channel is currently in the “general ground” state, the ground control command is automatically called to perform the ground mode switching operation. The original general ground mode is uniformly replaced by the “local shielding ground”. The operation maintains the electrical continuity of the channel while adjusting the shielding connection mode through the hardware configuration instruction to reduce the interference coupling between the signal path and the ground wire. The channels that have completed the ground mode switching are written into the updated configuration record, and the shielding ground setting table is generated.

[0102] The frequency interval detection submodule calls the common numbered channel pair combination in the shielding ground setting table, collects the excitation frequency value and calculates the frequency interval between channels, compares the frequency difference between channels with the inductive coincidence reference difference, judges whether there is a frequency interval lower than the reference difference, marks the channel pairs that meet the conditions, and generates a frequency interval abnormal channel pair list;

[0103] For each group of channel pairs, the current excitation frequency value is collected, and the frequency interval between channels is calculated. The system reads the number combination group by group, sets channels 05 and 08, and the excitation frequencies are 49.9 Hz and 50.1 Hz respectively. The frequency interval is 0.2 Hz. Compare the interval with the set inductive coincidence reference difference. If the reference difference is set to 0.3 Hz, the current channel difference is lower than the threshold, which is considered as a frequency interval abnormality. The system records the channel pair number in the abnormality marking list, records the channel pair combination that meets the conditions, and generates a frequency interval abnormal channel pair list.

[0104] The control parameter updating submodule performs interval pulling operation on the frequency value according to the channel number combination recorded in the frequency interval abnormal channel pair list, constructs the adjusted frequency distribution structure, and synchronously updates the excitation order and grounding state corresponding to the frequency distribution structure, and generates a test channel excitation control list;

[0105] Adjust the frequency value of each group of channels involved in the list. The system performs interval pulling operation. The frequency value is redistributed for each channel pair to make the difference above the set threshold. Set 49.9 Hz and 50.1 Hz to 49.6 Hz and 50.2 Hz respectively to increase the gap to 0.6 Hz to avoid inductive coincidence. The system synchronously updates the frequency distribution structure, and maps the frequency adjustment result back to the excitation order and grounding state configuration to form a new comprehensive control configuration content. The frequency value, excitation order position and grounding state of each channel are listed in this list, and a test channel excitation control list is generated.

[0106] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An intelligent test system for power testing, characterized by, The system comprises: The nameplate analysis module obtains power equipment nameplate image content, extracts the frequency field and matches the power frequency standard frequency point table to complete frequency feature positioning, extracts the capacity field content and uniformly converts it into kilovolt-ampere value, extracts the phase number field content and performs single-phase, two-phase or three-phase structure classification to generate a nameplate parameter structure vector group; The channel optimization module matches the channel set frequency point information in the power test, extracts the frequency matching channel number, and according to the capacity value, performs amplitude difference sorting on the capacity value and the channel load capacity list to generate a target test channel set; The channel optimization module comprises: The frequency constraint screening submodule calls the channel set frequency point information set based on the nameplate parameter structure vector group, performs frequency value comparison operation on the channel set frequency point, sets the frequency tolerance interval as the frequency matching reference value interval, records the channel number of the matching success, and generates a frequency matching channel number list; The channel load difference calculation submodule calls the channel load value in the frequency matching channel number list, uses the channel capacity difference calculation instruction, calculates the amplitude difference value between the capacity value and the channel load value, and sorts the difference value in ascending order to obtain the capacity difference sorting result; The redundant channel screening submodule calls the channel number sequence in the capacity difference sorting result, uses the channel number intersection matching judgment method to compare and screen the number list, retains the numbers existing in both lists as the screening channel number, retains the first six numbers in the difference value sorting order, and generates a limit condition screening channel number set; The target channel submodule establishes the channel attribute mapping according to the channel number structure based on the limit condition screening channel number set, calls the channel set frequency point information and load capacity value for number comparison and merging to generate a target test channel set; The path configuration module calls the target test channel set, establishes the channel attribute mapping according to the channel number structure, calls the channel set frequency point information and load capacity value for number comparison and merging to generate a target test channel set; The path configuration module comprises: The channel structure identification submodule calls the channel number in the target test channel set, combines the phase number classification result included in the nameplate parameter structure vector group, performs number quantity confirmation according to the phase number type corresponding channel quantity configuration rule, obtains the corresponding value of the channel number in the physical layout distance and wiring interval list, arranges the channel numbers in ascending order according to the number, and generates a phase number constrained channel order list; The path order arrangement submodule calls the wiring interval value and physical layout distance value of the corresponding channel number according to the channel number order in the phase number constrained channel order list, constructs the offset length sequence according to the number index order and layout data, calculates the time sequence offset value combined with the set path propagation relationship, and generates a channel path offset time sequence; The path sequence configuration result is generated by matching each set of offset time values with the response period of the corresponding channel number in the channel response period list, adjusting the channel number sequence structure, and calling the channel path offset time sequence. The interference identification module uses the number marked as the excitation starting channel in the path sequence configuration result, applies a fixed pulse width excitation current signal in the no-load state, and collects the induced current response signal amplitude of the adjacent numbered channels to generate a test path interference identification map.

2. The power test intelligent test system according to claim 1, characterized in that: The plaque parameter structure vector set includes frequency characteristic categories, capacity numerical standards, phase number structure categories, and rated current ampere values. The target test channel set includes frequency matching channel numbers, load capacity proximity numbers, and redundant path numbers. The path sequence configuration result includes wiring sequence lists, time offset values, and channel response mapping relationships. The test path interference identification map includes current amplitude ratio annotations, excitation time difference markers, and interference level combinations.

3. The power test intelligent test system according to claim 1, characterized in that: The plaque analysis module includes: The image data extraction submodule obtains the image content of the power equipment plaque, performs frame-by-frame scanning on the image area and removes blurred images, extracts text area images using a text area detection instruction, divides independent field areas based on character connectivity judgment instructions, compares the spatial positions of the four types of label texts and corresponding value pairs according to the character arrangement positions in the field area, and generates a field image mapping result. The field feature processing submodule splits the character boundary area based on the field image mapping result, obtains the character structure code, maps it to the corresponding digit symbol sequence, performs frequency point matching according to the extracted frequency value against the standard frequency point interval table, performs the same operation on the image area marked as the capacity field, uniformly converts the extracted capacity value to kilovolt-ampere numerical value, obtains the standard matching point and kilovolt-ampere capacity value pair, and generates a plaque parameter structure vector set. The structure state recognition submodule calls the image areas marked as the phase number field and the rated current field based on the standard matching point and kilovolt-ampere capacity value pair, performs character matching on the phase number value in the character sequence and compares it with the preset phase number structure classification information, divides it into single-phase, two-phase, or three-phase structure types, extracts the rated current character sequence and uniformly converts it to ampere value, and generates a plaque parameter structure vector set.

4. The power test intelligent test system according to claim 3, characterized in that: When the phase number classification result is three-phase, the number of confirmed channel numbers is 3; When the phase number classification result is single-phase, the number of confirmed channel numbers is 1; After the number of confirmed channel numbers, the corresponding values of the channel numbers in the physical layout distance and wiring interval list are extracted, the value threshold range of the wiring interval and the physical layout distance is set to not more than 10 mm and not more than 100 mm, respectively, and only when the value threshold condition is met, the channel number is retained; The process of constructing the offset length sequence according to the number index order and the layout data is as follows: taking the minimum channel number as the starting index position, taking the physical layout distance difference value corresponding to each channel number in ascending order of the number as the difference value between adjacent elements in the offset length sequence. In the matching operation of each group of offset time values and the response period of the corresponding channel number in the channel response period list, when the offset time value is greater than 20% of the upper limit of the response period of the corresponding channel number, the channel number sequence structure is adjusted to make the corresponding channel response period error within ±10%.

5. The power test intelligent test system according to claim 4, characterized in that: The interference identification module comprises: The excitation signal injection submodule calls the number marked as the excitation starting channel in the path sequence configuration result, applies a pulse-width excitation current signal with set parameters to the channel in the no-load state, records the starting excitation timestamp, and marks the channel numbers adjacent in the path sequence as synchronous response channels to generate an excitation channel and response channel mapping set; The current response extraction submodule collects the current signal sequence in the response channel within the excitation signal duration according to the excitation channel and response channel mapping set, extracts the response current amplitude corresponding to the peak amplitude point and the response time point, calculates the ratio of the current amplitude of the response channel to the amplitude of the excitation channel, and calculates the time difference between the excitation timestamp and the response time point to generate a channel pair current amplitude ratio and excitation time difference value table; The interference level labeling submodule calls the amplitude ratio in the channel pair current amplitude ratio and excitation time difference value table, performs amplitude comparison operation on the channel pair ratio and the set inductance interference level standard ratio, screens the channel pair combinations higher than the standard ratio, and marks the corresponding channel pairs in the original path number structure to generate a test path interference identification map.

6. The power test intelligent test system according to claim 5, characterized in that: In the process of applying a pulse-width excitation current signal with set parameters to the channel in the no-load state, the set parameters are periodic pulse waveforms with a pulse width value not less than 100 microseconds and a current amplitude between 2 amperes and 5 amperes; The process of marking the channel numbers adjacent in the path sequence as synchronous response channels is: when the physical layout distance value of the adjacent channel numbers and the layout distance difference value of the excitation starting channel do not exceed 30 millimeters, the adjacent channel numbers are determined as synchronous response channels and are included in the excitation channel and response channel mapping set; In the process of extracting the response current amplitude corresponding to the peak amplitude point and the response time point by the current response extraction submodule, the local peak value in the response current signal sequence is greater than twice the average value and the interval with the rising edge is less than 50 microseconds as the determination condition; When the interference level labeling submodule calls the amplitude ratio in the channel pair current amplitude ratio and excitation time difference value table, the inductance interference level standard ratio is set to 0.3, and only the channel numbers of the channel pairs with an amplitude ratio greater than the standard ratio are marked.

7. The power test intelligent test system according to claim 1, characterized in that: The system further comprises an excitation control module: The excitation control module adjusts the corresponding excitation sequence to a non-continuous sequence based on the channel pair combinations marked as high interference levels in the test path interference identification map, reads the ground setting value corresponding to the channel, switches the original channel ground state to a local shielding ground, detects the frequency spacing value of the same group of channels in real time, judges whether the frequency spacing is lower than the inductive coincidence reference difference, and if so, performs discrete adjustment on the frequency spacing, updates the excitation sequence table and the ground setting table, and generates a test channel excitation control list. The test channel excitation control list includes a non-continuous excitation sequence, a local grounding setting, and a frequency discrete adjustment parameter.

8. The power test intelligent test system according to claim 7, characterized in that: The excitation regulation module includes: The excitation sequence adjustment submodule combines channel pairs marked with high interference levels in the test path interference identification map, extracts the position index of the channel number in the original excitation sequence, uses a jump number rearrangement method to redistribute adjacent channel pairs to non-continuous positions in the excitation sequence, constructs a rearranged channel number sequence structure, and generates an interference avoidance excitation sequence table; The grounding mode switching submodule calls the channel numbers in the interference avoidance excitation sequence table, reads the grounding setting values corresponding to the numbers, performs a grounding mode modification operation on channels marked as general grounding states in the original setting, and uniformly updates them to local shielding grounding states to generate a shielding grounding setting table; The frequency interval detection submodule calls the common channel pair combination in the shielding grounding setting table, collects the excitation frequency values and calculates the frequency interval between channels, compares the frequency difference between channels with the coincidence reference difference, judges whether there is a frequency interval lower than the reference difference, marks the channel pairs that meet the conditions, and generates a frequency interval abnormal channel pair list; The control parameter update submodule performs an interval opening operation on the frequency values according to the channel number combination recorded in the frequency interval abnormal channel pair list, constructs an adjusted frequency distribution structure, and synchronously updates the excitation sequence and grounding state corresponding to the frequency distribution structure to generate a test channel excitation control list.

Images