A method, device, processor and storage medium for online monitoring of current transformation ratio of high and low voltage sides of a combined transformer

Abstract

The present invention relates to the technical field of transformation ratio monitoring, and specifically discloses an online monitoring method, device, processor and storage medium for the current transformation ratio of the high and low voltage sides of a combined transformer. The method includes: obtaining historical current data of the combined transformer; determining a low radiation period based on the historical current data; obtaining current primary side current data and current secondary side current data in the current low radiation period; performing data optimization on the current primary side current data and the current secondary side current data to obtain optimized current data; generating a current transformation ratio based on the optimized current data. By analyzing the historical transformation ratio curve, the system can identify periods with lower radiation levels, thereby reducing the impact of environmental factors on current measurement. By smoothing the historical transformation ratio curve, the noise and interference in the current signal are reduced, making the current transformation ratio value more stable and accurate. By identifying and determining the low radiation period, data errors caused by external interference can be effectively avoided, and the reliability of the data can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformation ratio monitoring, and in particular to an online monitoring method, device, processor and storage medium for the current transformation ratio of a combined transformer at high and low voltage sides. Background Art

[0002] In the power system, combined transformers are widely used in high-voltage transmission lines and substations. However, due to certain technical difficulties in online real-time measurement of high-voltage side current, the current ratio monitoring of combined transformers currently relies mainly on manual regular inspections and offline detection, which is inefficient and has safety risks.

[0003] The transformation ratio of a transformer (or transformation ratio) is the ratio of the transformer output to the input value. The transformation ratio of a transformer plays a vital role in measurement and monitoring, relay protection and automatic devices, safety and isolation in the power system. The transformation ratio of a transformer plays a key role in the power system. It is not only related to the accuracy and safety of power measurement, but also directly affects the operating efficiency and safety protection of the power system.

[0004] In the prior art, technicians often use special equipment to detect the current transformation ratio of the combined transformer. This method is costly and complex to detect. Based on this problem, technicians also use some portable devices to collect the current data of the primary side and the secondary side of the combined transformer. However, on the one hand, this method has high safety risks and is dangerous, which does not meet actual needs; on the other hand, when detecting the primary and secondary currents of the combined transformer, it often faces a high electromagnetic interference environment, which has a great impact on the detection results and cannot meet actual needs. Summary of the invention

[0005] In order to overcome the above-mentioned technical problems existing in the prior art, an embodiment of the present invention provides an online monitoring method for the current transformation ratio of the high and low voltage sides of a combined transformer. By analyzing the historical transformation ratio curve, the system can identify time periods with lower radiation levels, thereby reducing the impact of environmental factors on current measurement.

[0006] In order to achieve the above-mentioned objectives, an embodiment of the present invention provides an online monitoring method for the current transformation ratio of the high and low voltage sides of a combined transformer, the method comprising: obtaining historical current data of the combined transformer; determining a low radiation period based on the historical current data; obtaining current primary side current data and current secondary side current data in the current low radiation period; performing data optimization on the current primary side current data and the current secondary side current data to obtain optimized current data; and generating a current transformation ratio based on the optimized current data.

[0007] Preferably, the historical current data includes historical primary side current data and corresponding historical secondary side current data, and determining the low radiation period based on the historical current data includes: determining a historical transformation ratio value based on the historical primary side current data and the historical secondary side current data; generating a historical transformation ratio curve based on the historical transformation ratio value; performing smoothing on the historical transformation ratio curve to obtain a smoothed transformation ratio curve; and determining the low radiation period based on the smoothed transformation ratio curve.

[0008] Preferably, determining the low radiation time period based on the smooth transformation ratio curve includes: determining a preset time period; intercepting the smooth transformation ratio curve based on the preset time period to obtain a periodic curve; intercepting the periodic curve for smoothness based on a preset fluctuation range to obtain multiple smooth curve segments; obtaining the deviation value between each smooth curve segment and the rated transformation ratio; determining the closest smooth curve segment with the smallest deviation value; and determining the time period corresponding to the closest smooth curve segment as the low radiation time period.

[0009] Preferably, the method also includes: before generating the deviation value, obtaining the usage time and the current ambient temperature of the combined transformer; determining the offset ratio based on the usage time and the rated ratio; adjusting the offset ratio based on the current ambient temperature to generate an adjusted ratio; and obtaining the deviation value between each smooth curve segment and the adjusted ratio.

[0010] Preferably, the method also includes: after generating the deviation value, judging whether there are multiple deviation values ​​less than the preset deviation threshold based on the preset deviation threshold; if so, determining multiple corresponding smooth curve segments to be selected; obtaining the primary side current value corresponding to each smooth curve segment to be selected; determining the selected smooth curve segment with the smallest primary side current value as the selected smooth curve segment; and determining the time period corresponding to the selected smooth curve segment as the low radiation time period.

[0011] Preferably, the data optimization is performed on the current primary side current data and the current secondary side current data to obtain the optimized current data, including: performing data processing on the current primary side current data and the current secondary side current data based on the Fourier transform algorithm to obtain frequency domain current data; performing interference frequency analysis on the frequency domain current data to generate a frequency parameter value; generating a corresponding Butterworth filter based on the frequency parameter value; and processing the current primary side current data and the current secondary side current data based on the Butterworth filter to generate the optimized current data.

[0012] Correspondingly, the present invention also provides an online monitoring device for the current transformation ratio of the high and low voltage sides of a combined transformer, the device comprising: a first data acquisition unit, used to obtain historical current data of the combined transformer; a time period determination unit, used to determine a low radiation time period based on the historical current data; a second data acquisition unit, used to obtain current primary side current data and current secondary side current data in the current low radiation time period; an optimization unit, used to perform data optimization on the current primary side current data and the current secondary side current data to obtain optimized current data; a transformation ratio generation unit, used to generate a current transformation ratio based on the optimized current data.

[0013] Preferably, the historical current data includes historical primary side current data and corresponding historical secondary side current data, and the time period determination unit is specifically used to: determine a historical transformation ratio value based on the historical primary side current data and the historical secondary side current data; generate a historical transformation ratio curve based on the historical transformation ratio value; perform smoothing on the historical transformation ratio curve to obtain a smoothed transformation ratio curve; and determine a low radiation time period based on the smoothed transformation ratio curve.

[0014] Correspondingly, an embodiment of the present invention further provides a processor for running a program, wherein the program, when being run, is used to execute the method described in the embodiment of the present invention.

[0015] Correspondingly, an embodiment of the present invention further provides a storage medium, when instructions in the storage medium are executed by a central processing unit, the central processing unit can execute the method described in the embodiment of the present invention.

[0016] Through the technical solution provided by the present invention, the present invention has at least the following technical effects:

[0017] By smoothing the historical ratio curve, the noise and interference in the current signal are reduced, making the current ratio value more stable and accurate. By identifying and determining the low radiation period, data errors caused by external interference can be effectively avoided and the reliability of the data can be improved. This method can realize the automated monitoring process. Through historical current data and automatic smoothing, the system can independently determine the low radiation period and collect data without manual intervention. At the same time, accurate current ratio monitoring helps to detect abnormal conditions of equipment in advance and provide timely early warning information for equipment managers. Through long-term accumulated historical data, the operating trend of the equipment can be predicted, and measures can be taken in advance for maintenance, reducing the occurrence of sudden failures, reducing maintenance costs, and extending the service life of the equipment.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementation methods, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention.

[0020] Figure 1 It is a flow chart of an online monitoring method of the current transformation ratio of the high and low voltage sides of a combined transformer provided in an embodiment of the present application;

[0021] Figure 2 A functional module block diagram of an online monitoring device for the current transformation ratio of the high and low voltage sides of a combined transformer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0023] The terms "system" and "network" in the embodiments of the present invention can be used interchangeably. "Multiple" means two or more than two. In view of this, "multiple" can also be understood as "at least two" in the embodiments of the present invention. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previous and subsequent associated objects are in an "or" relationship. In addition, it should be understood that in the description of the embodiments of the present invention, the words "first", "second", etc. are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0024] The background technology of the present invention is first introduced below.

[0025] Among dedicated transformer users, high-voltage 10KV three-phase electricity is usually connected to the load to provide corresponding power supply for the load. During the power consumption process, the combined transformer is used to provide safe and reliable power supply for the power consumption monitoring equipment. Therefore, the reliability of the combined transformer has a great influence on the accuracy of power consumption monitoring. During the use of the combined transformer, the monitoring of its current transformation ratio is affected by various radiation interferences. The existing technology uses special equipment to resist or filter interference, which is costly, increases the operating costs of the enterprise, and cannot meet actual needs.

[0026] To solve the above problems, see Figure 1 The embodiment of the present invention provides an online monitoring method for the current transformation ratio of the high-voltage and low-voltage sides of a combined transformer, the method comprising:

[0027] S10: Acquire historical current data of the combined transformer;

[0028] S20: Determine a low radiation period based on the historical current data;

[0029] S30: Acquire current primary-side current data and current secondary-side current data during the current low radiation period;

[0030] S40: performing data optimization on the current primary-side current data and the current secondary-side current data to obtain optimized current data;

[0031] S50: Generate a current transformation ratio based on the optimized current data.

[0032] In a possible implementation, first, the system needs to obtain historical current data of the combined transformer. Further, in order to reduce the impact of environmental factors on current measurement, the system determines a low radiation period based on the historical current data. During the determined low radiation period, the system collects the current primary side high voltage current data and the current secondary side low voltage current data. Further, the collected current data is optimized to obtain more accurate current data. By calculating the ratio of the optimized current data, an accurate current transformation ratio is obtained.

[0033] Accurate current ratio monitoring helps to timely detect abnormal operating conditions of transformers, so that early warning and processing can be carried out before the problem expands, avoiding safety accidents or power outages caused by equipment failure. Long-term monitoring and optimization data can accumulate trends and laws of system operation, which will help improve the overall reliability of the power system.

[0034] For example, in one embodiment, technicians can determine a fixed low radiation period based on actual conditions, such as the current of the line where the combined transformer is located, the current of surrounding electrical equipment, etc. However, in actual application, the radiation level to which the combined transformer is exposed is not only related to the radiation generated by external electrical equipment, but also to its own physical properties, so the above traditional method may have deviations.

[0035] In an embodiment of the present invention, the historical current data includes historical primary side current data and corresponding historical secondary side current data, and determining the low radiation period based on the historical current data includes: determining a historical transformation ratio value based on the historical primary side current data and the historical secondary side current data; generating a historical transformation ratio curve based on the historical transformation ratio value; performing smoothing on the historical transformation ratio curve to obtain a smoothed transformation ratio curve; and determining the low radiation period based on the smoothed transformation ratio curve.

[0036] In a possible implementation, firstly, the historical primary current data and the corresponding historical secondary current data in the historical current data are obtained. Further, based on the historical primary and secondary current data, the historical transformation ratio value is calculated. By calculating the historical data, the stability and change trend of the transformation ratio of the combined transformer over a period of time can be understood. Further, according to the calculated historical transformation ratio value, a corresponding historical transformation ratio curve is generated. The change of the current transformation ratio of the combined transformer at different time nodes can be known through the historical transformation ratio curve. At the same time, the fluctuation of the historical transformation ratio curve reflects the influence of the interference on the transformation ratio of the transformer during use. Among them, the part with larger fluctuation may be affected by electrical noise or external interference, and the relatively stable part may represent a relatively stable working state. Further, the historical transformation ratio curve is smoothed to remove the high-frequency noise and abnormal fluctuations in the curve, so that the final curve can more accurately reflect the real influence on the transformation ratio of the combined transformer, and obtain a smooth transformation ratio curve. Through this step, the noise interference in the current signal can be reduced, the transformation ratio curve is smoother, and it is convenient to analyze the stable transformation ratio trend. By performing smoothing on the historical transformation ratio curve, the noise and interference in the current signal are reduced, making the current transformation ratio value more stable and accurate.

[0037] Furthermore, based on the smoothed transformation ratio curve, the relatively stable time period, i.e., the low radiation period, is further analyzed. Among them, the low radiation period refers to the time period with small current fluctuations, less external noise, and relatively pure data. At this time, the current measurement result is relatively accurate, with small errors and high reliability. By measuring and monitoring the current transformation ratio during this period, a more accurate current transformation ratio value can be obtained, while greatly reducing the high cost expenditure and high detection complexity caused by the need to actively eliminate radiation interference in the process of detecting the transformation ratio of the combined transformer, allowing a higher transformation ratio detection accuracy to be achieved on the basis of a lower-cost filtering radiation solution. By identifying and determining the low radiation period, data errors caused by external interference can be effectively avoided and data reliability can be improved. This method ensures that the measurement data performed during the low radiation period is more accurate and is not interfered by electrical noise or other external factors.

[0038] In an embodiment of the present invention, determining a low radiation time period based on the smooth transformation ratio curve includes: determining a preset time period; intercepting the smooth transformation ratio curve based on the preset time period to obtain a periodic curve; intercepting the periodic curve for smoothness based on a preset fluctuation range to obtain multiple smooth curve segments; obtaining a deviation value between each smooth curve segment and the rated transformation ratio; determining the closest smooth curve segment with the smallest deviation value; and determining the time period corresponding to the closest smooth curve segment as a low radiation time period.

[0039] In a possible implementation, since people's daily life activities have certain regularity, the low radiation period can be intercepted and analyzed in a fixed regular cycle. First, a time period is set to define the scope of data interception (for example, 1 day). Through this period, the operating status of the combined transformer can be observed within a specific time window. Further, the smooth transformation ratio curve is intercepted based on the preset time period to generate a periodic curve. Among them, the periodic curve reflects the change trend of the current transformation ratio of the combined transformer in a regular change cycle. Through this operation, the specific performance of the current transformation ratio can be observed in a specific period of time, reducing the amount of analysis data and improving analysis efficiency.

[0040] Furthermore, the periodic curve is further screened by setting a preset fluctuation range. If a certain fluctuation in the periodic curve exceeds this range, it will be regarded as an unstable part. This part is considered that the combined transformer is in a high-intensity radiation environment. Therefore, the collected primary and secondary data may be subject to great electromagnetic interference, resulting in insufficient accuracy and low credibility, and is therefore excluded from the analysis. The remaining part, the curve segment with smaller fluctuations and relatively stable, is a stable curve segment that meets the stability requirements. After obtaining multiple stable curve segments, the system calculates the deviation value between each stable curve segment and the rated transformation ratio. Among them, the rated transformation ratio is the ideal current transformation ratio value specified when the equipment is designed. Generally speaking, the actual transformation ratio of the combined transformer in normal use should not deviate much from or be close to the rated transformation ratio. Therefore, by comparison, the stable curve segment with the smallest deviation from the rated transformation ratio is found, that is, the curve segment that is the most stable and closest to the actual transformation ratio value. Finally, the time period corresponding to the stable curve segment with the smallest deviation value is determined as the low radiation period.

[0041] In an embodiment of the present invention, by actively avoiding high radiation periods and monitoring the current ratio during low radiation periods during the monitoring process of the current ratio of the combined transformer, the interference effect caused by radiation is effectively reduced and the accuracy of current ratio monitoring is improved; at the same time, the configuration cost of the anti-interference equipment required in the current ratio monitoring process can be effectively reduced, and the use of low anti-interference equipment can also meet actual needs, thereby effectively reducing the operating costs of the enterprise and improving the operating efficiency of the enterprise.

[0042] In actual application, the low radiation period is determined by analyzing the rated transformation ratio of the combined transformer. During the use of the combined transformer, its actual transformation ratio will change with the length of its use time. Therefore, using a fixed factory value may cause deviations in the actual transformation ratio monitoring.

[0043] In an embodiment of the present invention, the method also includes: before generating the deviation value, obtaining the usage time and the current ambient temperature of the combined transformer; determining the offset ratio based on the usage time and the rated ratio; adjusting the offset ratio based on the current ambient temperature to generate an adjusted ratio; and obtaining the deviation value between each smooth curve segment and the adjusted ratio.

[0044] In a possible implementation, before calculating the ratio deviation value, it is first necessary to collect the usage time and current ambient temperature of the combined transformer. The usage time reflects the aging degree of the equipment. After a long period of operation, the electrical characteristics of the equipment may change to a certain extent, so it is necessary to consider the impact of these changes on the ratio measurement results. The ambient temperature may affect the physical properties inside the combined transformer, especially in high or low temperature environments, the ratio of the combined transformer will be affected and changed.

[0045] Furthermore, the offset ratio is determined based on the usage time and rated ratio of the equipment. For example, the technician can determine the change mapping table between the usage time of the combined transformer and its rated ratio based on big data in advance. In the subsequent analysis, based on the difference between the usage time and the rated ratio, the system calculates the offset ratio to compensate for the changes caused by the long-term use of the equipment.

[0046] Furthermore, the system will adjust the offset ratio according to the current ambient temperature. Since temperature will cause thermal expansion or contraction of electrical components (such as coils, cores, etc.), temperature changes will affect the accuracy of current ratio measurement. Therefore, the system will perform temperature compensation on the offset ratio according to the current temperature change to generate an adjusted ratio. After obtaining the adjusted ratio, each stable curve segment is compared with the adjusted ratio. By calculating the deviation between the stable curve segment and the adjusted ratio, the low radiation period closest to the actual situation can be further selected. The purpose of this step is to eliminate the influence of temperature and equipment aging on the measurement results, so that the low radiation period finally selected can more accurately reflect the actual working status of the equipment. By taking into account factors such as the use time of the equipment and the ambient temperature, the system can adjust the deviation more accurately and improve the accuracy of the estimation of the actual current ratio.

[0047] However, in practical applications, the actual radiation size is also related to the current size flowing through the combined transformer. Therefore, if only focusing on the distance between the stable curve segment and the estimated rated current ratio is used to determine the optimal stable curve, deviations may occur.

[0048] In an embodiment of the present invention, after the deviation value is generated, it is determined based on a preset deviation threshold whether there are multiple deviation values ​​less than the preset deviation threshold; if so, a corresponding plurality of smooth curve segments to be selected are determined; the primary side current value corresponding to each smooth curve segment to be selected is obtained; the smooth curve segment to be selected with the smallest primary side current value is determined as the selected smooth curve segment; and the time period corresponding to the selected smooth curve segment is determined as the low radiation time period.

[0049] In a possible implementation, the technician pre-sets a preset deviation threshold, and the stable curves within the preset deviation threshold are considered to meet the stability requirements. After the deviation value is generated, it is determined whether there are multiple deviation values ​​less than the threshold according to the preset deviation threshold, that is, whether there are multiple stable curves that meet the requirements. If it is determined that multiple deviation values ​​are less than the preset deviation threshold, the system will mark the stable curve segments corresponding to these deviation values ​​as the selected stable curve segments. The deviation values ​​of these stable curve segments are all within an allowable error range. Further, for each stable curve segment to be selected, the corresponding primary side current value is obtained, and the stable curve segment with the smallest primary side current value is selected as the selected stable curve segment. At this time, the stable curve segment with the smallest primary side current value can be determined to be in the lowest interference state and in a stable operating state, which is conducive to accurately reflecting the current ratio characteristics of the low radiation period. Finally, the system determines the period corresponding to the selected stable curve segment as the low radiation period.

[0050] In the embodiment of the present invention, the radiation condition of the combined transformer is comprehensively analyzed from both external and internal factors to determine the accurate low-radiation period when the combined transformer is subjected to the lowest radiation both internally and externally, and the current transformation ratio is monitored on this basis, thereby greatly improving the monitoring accuracy and reliability of the current transformation ratio.

[0051] After determining the accurate low radiation period, start online monitoring of the current transformation ratio of the combined transformer. Specifically, collect the current primary current data and secondary current data during the low radiation period. There is still noise or interference influence on the original collected primary current data and secondary current data. In order to obtain accurate data, it is optimized.

[0052] In an embodiment of the present invention, the data optimization is performed on the current primary side current data and the current secondary side current data to obtain the optimized current data, including: performing data processing on the current primary side current data and the current secondary side current data based on the Fourier transform algorithm to obtain frequency domain current data; performing interference frequency analysis on the frequency domain current data to generate a frequency parameter value; generating a corresponding Butterworth filter based on the frequency parameter value; and processing the current primary side current data and the current secondary side current data based on the Butterworth filter to generate the optimized current data.

[0053] In one possible implementation, during the optimization process, the current primary current data and secondary current data are first processed by the Fourier transform algorithm to convert them from the time domain to frequency domain signals. The core purpose of this step is to separate the different frequency components of the current signal so that more accurate interference frequency analysis and filtering operations can be performed in the frequency domain. The Fourier transform can decompose complex time domain signals into a series of sine waves, which is convenient for subsequent analysis and optimization. Next, the system performs interference frequency analysis on the frequency domain signal to identify possible interference signals in the frequency domain. These interferences are usually caused by electromagnetic noise, power line interference or other external factors, which affect the accuracy and stability of the current data. Through interference frequency analysis, it is possible to determine which interferences are external interferences, which interferences are internal interferences, and the actual characteristics of each interference, and extract the frequency parameter value.

[0054] At this point, the frequency parameter values ​​extracted from the interference frequency analysis are further used to generate a Butterworth filter. The Butterworth filter is a flat filter that provides uniform gain within the passband and has a steep attenuation outside the cutoff frequency. By adjusting the order and cutoff frequency of the filter, the filtering of specific frequency components can be precisely controlled, thereby effectively suppressing noise or interference in the current data.

[0055] After determining the parameters of the Butterworth filter, the primary and secondary current data are frequency-domain filtered by the filter. The filtering process converts the original current data sequence into a frequency-domain signal through a discrete-time signal processing algorithm, performs filtering operations in the frequency domain, and removes unnecessary interference frequency components. Finally, the filtered frequency-domain signal is converted back to a time-domain signal through an inverse Fourier transform to obtain the optimized current data. The optimized current data removes the interference frequency components, has higher accuracy and stability, and is suitable for further analysis and monitoring of power equipment. At this time, the accurate current ratio of the combined transformer can be obtained based on the optimized current data, achieving efficient and accurate online monitoring of the current ratio of the combined transformer.

[0056] Based on the same inventive concept, see Figure 2An embodiment of the present invention provides an online monitoring device for the current transformation ratio of the high-voltage and low-voltage sides of a combined transformer, the device comprising: a first data acquisition unit, used to obtain historical current data of the combined transformer; a time period determination unit, used to determine a low radiation time period based on the historical current data; a second data acquisition unit, used to obtain current primary side current data and current secondary side current data in the current low radiation time period; an optimization unit, used to perform data optimization on the current primary side current data and the current secondary side current data to obtain optimized current data; a transformation ratio generation unit, used to generate a current transformation ratio based on the optimized current data.

[0057] In an embodiment of the present invention, the historical current data includes historical primary side current data and corresponding historical secondary side current data, and the time period determination unit is specifically used to: determine a historical transformation ratio value based on the historical primary side current data and the historical secondary side current data; generate a historical transformation ratio curve based on the historical transformation ratio value; perform smoothing on the historical transformation ratio curve to obtain a smoothed transformation ratio curve; and determine a low radiation time period based on the smoothed transformation ratio curve.

[0058] Furthermore, an embodiment of the present invention also provides a processor, wherein the program is used to execute the method described in the embodiment of the present invention when it is run.

[0059] Furthermore, an embodiment of the present invention also provides a storage medium, when the instructions in the storage medium are executed by a central processing unit, the central processing unit can execute the method described in the embodiment of the present invention.

[0060] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0061] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0062] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0063] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. An online monitoring method for the current transformation ratio of the high and low voltage sides of a combined transformer, characterized in that: The method comprises: Acquiring historical current data of the combined transformer; determining a low radiation period based on the historical current data; Acquire current primary side current data and current secondary side current data during the current low radiation period; Performing data optimization on current primary-side current data and current secondary-side current data to obtain optimized current data; generating a current transformation ratio based on the optimized current data; The historical current data includes historical primary-side current data and corresponding historical secondary-side current data, and determining the low radiation period based on the historical current data includes: Determining a historical transformation ratio value based on the historical primary-side current data and the historical secondary-side current data; generating a historical transformation ratio curve based on the historical transformation ratio value; Performing smoothing processing on the historical transformation ratio curve to obtain a smoothed transformation ratio curve; Determining a low radiation period based on the smoothed ratio curve; The determining of the low radiation period based on the smoothed ratio curve comprises: determining a preset time period; Intercepting the smooth transformation ratio curve based on the preset time period to obtain a periodic curve; Performing stationarity interception on the periodic curve based on a preset fluctuation range to obtain a plurality of stationary curve segments; Obtain the deviation value between each stable curve segment and the rated transformation ratio; Determine the closest stable curve segment with the smallest deviation value; The time period corresponding to the segment closest to the stable curve is determined as the low radiation time period.

2. The method according to claim 1, characterized in that The method further comprises: Before generating the deviation value, obtaining the usage time and current ambient temperature of the combined mutual inductor; determining an offset ratio based on the usage time and the rated ratio; Adjusting the offset transformation ratio based on the current ambient temperature to generate an adjusted transformation ratio; Obtain a deviation value between each stable curve segment and the adjusted transformation ratio.

3. The method according to claim 1, characterized in that The method further comprises: After generating the deviation value, determining whether there are multiple deviation values ​​less than the preset deviation threshold based on the preset deviation threshold; If so, determine the corresponding multiple stable curve segments to be selected; Obtaining the primary side current value corresponding to each stable curve segment to be selected; The selected stable curve segment with the smallest primary-side current value is determined as the selected stable curve segment; The time period corresponding to the selected stable curve segment is determined as a low radiation time period.

4. The method according to claim 1, characterized in that: The performing data optimization on the current primary-side current data and the current secondary-side current data to obtain optimized current data includes: Performing data processing on the current primary side current data and the current secondary side current data based on the Fourier transform algorithm to obtain frequency domain current data; Performing interference frequency analysis on the frequency domain current data to generate a frequency parameter value; Generate a corresponding Butterworth filter based on the frequency parameter value; The current primary-side current data and the current secondary-side current data are processed based on the Butterworth filter to generate optimized current data.

5. An online monitoring device for the current transformation ratio of the high and low voltage sides of a combined transformer, characterized in that: The device comprises: A first data acquisition unit, used to obtain historical current data of the combined transformer; a time period determination unit, configured to determine a low radiation time period based on the historical current data; A second data acquisition unit is used to obtain current primary side current data and current secondary side current data in a current low radiation period; An optimization unit, used for performing data optimization on current primary-side current data and current secondary-side current data to obtain optimized current data; A transformation ratio generating unit, configured to generate a current transformation ratio based on the optimized current data; The historical current data includes historical primary-side current data and corresponding historical secondary-side current data, and the time period determination unit is specifically used for: Determining a historical transformation ratio value based on the historical primary-side current data and the historical secondary-side current data; generating a historical transformation ratio curve based on the historical transformation ratio value; Performing smoothing processing on the historical transformation ratio curve to obtain a smoothed transformation ratio curve; Determining a low radiation period based on the smoothed ratio curve; The determining of the low radiation period based on the smoothed ratio curve comprises: determining a preset time period; Intercepting the smooth transformation ratio curve based on the preset time period to obtain a periodic curve; Performing stationarity interception on the periodic curve based on a preset fluctuation range to obtain a plurality of stationary curve segments; Obtain the deviation value between each stable curve segment and the rated transformation ratio; Determine the closest stable curve segment with the smallest deviation value; The time period corresponding to the segment closest to the stable curve is determined as the low radiation time period.

6. A processor, characterized in that: Used to run a program, wherein the program is used to execute the method according to any one of claims 1 to 4 when being run.

7. A storage medium, characterized in that: When the instructions in the storage medium are executed by a central processing unit, the central processing unit is enabled to execute the method according to any one of claims 1 to 4.

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