Operation monitoring method and system for capacitor inrush current suppression device
By using a capacitance measurement module in the capacitor surge current suppression device to monitor the capacitance value of the capacitor and generate alarm information based on preset thresholds, the problem of capacity attenuation caused by capacitor aging is solved, and the efficiency of power utilization is improved.
Patent Information
- Application Number
- CN202411254888.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-02-11
AI Technical Summary
The capacitor will age during use, resulting in capacity attenuation, unable to meet the reactive power compensation requirements, increasing the power transmission loss and reducing the power utilization efficiency.
A method for operating monitoring of a capacitor surge current suppression device is provided. The actual capacitance value of the capacitor is measured through the capacitance value measurement module and compared with the preset capacitance threshold. If the actual capacitance value is less than or equal to the threshold, an alarm message is generated to remind the capacitor to be replaced.
By replacing the aged capacitor in time, ensure that the capacitor is replaced before reaching the capacitance threshold, avoid the negative impact of capacity attenuation on the power system, and improve the efficiency of power utilization.
Smart Images
Figure CN119419684A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of inrush current suppression, and in particular to an operation monitoring method and system for a capacitor inrush current suppression device. Background Art
[0002] With the continuous development of industry and the continuous improvement of modernization, enterprises in all walks of life have higher requirements for the quality of electricity provided by the power transmission system, especially factories with large equipment and large machinery, which have a high dependence on the stability of electricity, which is related to the stable production of enterprises and the normal operation of equipment. The staff on the power supply side and the user side also independently designed and adopted relevant technical means to optimize the structure and layout of the power supply equipment to improve the power system and meet the basic needs of enterprise production and operation.
[0003] During the operation of the power transmission system, connecting a capacitor bank in the line is one of the common means to improve the power factor, which is used to reduce the loss of power resources in the transmission line and improve the utilization efficiency of power resources.
[0004] During the switching process of the capacitor bank, accompanied by the oscillation and propagation of electromagnetic energy, a large closing surge current will be generated at the moment of closing the capacitor bank, which will have an impact on the electrical equipment. For this reason, relevant capacitor surge current suppression devices have come into being. By setting the capacitor in the integrated cabinet of the surge current suppression device, surge current suppression is performed, thereby reducing the impact of the surge current phenomenon on the electrical equipment.
[0005] However, with the continuous use of capacitors and the continuous influence of the surrounding environment, the capacitors will gradually age, causing the capacity of the capacitors to gradually decay, and will not be able to meet the relevant requirements for reactive power compensation, increasing power transmission losses and reducing power utilization efficiency. Summary of the invention
[0006] In order to facilitate the discovery of capacitors in a reactive power compensation device that have reached a capacitance threshold (a preset attenuation limit threshold), the present application provides an operation monitoring method and system for a capacitor inrush current suppression device.
[0007] In a first aspect, the present application provides an operation monitoring method of a capacitor inrush current suppression device, which adopts the following technical solution:
[0008] A method for monitoring the operation of a capacitor inrush current suppression device, the method being applied to the inrush current suppression device, the inrush current suppression device being provided with a capacitance measurement module, the capacitance measurement module being used to measure the capacitance of a capacitor in the inrush current suppression device, the method comprising:
[0009] receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module;
[0010] Comparing the current actual capacitance of the target capacitor at the current switching times with a preset capacitance threshold;
[0011] If the current actual capacitance of the target capacitor at the current switching times is less than or equal to the preset capacitance threshold, an alarm message is generated and sent to an alarm device arranged in the inrush current suppression device.
[0012] By adopting the above technical solution, the capacitance measurement module in the surge current suppression device measures the actual capacitance of the capacitor, that is, the actual capacitance of the capacitor in the current state is measured by the capacitance measurement module, and the actual capacitance of the capacitor is compared with a preset capacitance threshold (the capacitance threshold here refers to the preset effective minimum working standard capacitance value of the capacitor, that is, the attenuation limit threshold).
[0013] If the measured actual capacitance is less than or equal to the capacitance threshold, an alarm message is generated and sent to an alarm device to send an alarm signal to remind staff to replace the capacitor that has reached the attenuation limit.
[0014] Optionally, after receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module, the method further includes:
[0015] Obtaining the usage time of the target capacitor and the theoretical capacitance value corresponding to the usage time;
[0016] The theoretical attenuation curve of the target capacitor is established by taking the service life of the target capacitor as the horizontal axis and the theoretical capacitance corresponding to the service life of the target capacitor as the vertical axis;
[0017] Based on the measured actual capacitance of the target capacitor and the theoretical attenuation curve, an estimated usage time of the target capacitor is obtained.
[0018] By adopting the above technical solution, the usage time in this solution refers to the usage time of the capacitor standard parts in a laboratory environment, and the theoretical capacitance corresponding to the usage time refers to the theoretical capacitance in a laboratory environment.
[0019] Based on the theoretical attenuation curve and the actual capacitance, the estimated service life of the target capacitor is calculated and inferred, so that the operator can formulate a maintenance cycle according to the estimated service life to ensure that the capacitor can be replaced before the capacitance threshold is reached.
[0020] Optionally, obtaining the estimated usage time of the target capacitor based on the measured actual capacitance of the target capacitor and the theoretical attenuation curve includes:
[0021] Obtain the actual duration t1 corresponding to the actual capacitance value, and obtain the theoretical duration t2 corresponding to the actual capacitance value in the theoretical attenuation curve;
[0022] Obtain the theoretical time t3 corresponding to the capacitance threshold in the theoretical attenuation curve;
[0023] Based on the actual duration t1, the theoretical duration t2 and the theoretical duration t3, the estimated usage duration t4 is calculated according to the following formula:
[0024]
[0025] By adopting the above technical solution, according to the actual capacitance measured by the capacitance measurement module, the equal capacitance coordinates are located in the vertical curve in the theoretical attenuation curve, and the corresponding usage time under the capacitance coordinates, that is, the theoretical time t2, is obtained, and then the theoretical time t3 corresponding to the capacitance threshold is obtained in the theoretical attenuation curve. The estimated usage time t4 is calculated according to the above t1, t2, t3 and the above formula. The derivation of the relevant formula will be explained in the specific implementation method.
[0026] Optionally, obtaining the estimated usage time of the target capacitor based on the measured actual capacitance of the target capacitor and the theoretical attenuation curve includes:
[0027] Divide a plurality of temperature gradient intervals according to a preset temperature span value, and match a plurality of capacitors corresponding to the plurality of temperature gradient intervals in the power distribution area;
[0028] Obtaining phased capacitance change values of a plurality of the capacitors within a preset sampling time before the current moment;
[0029] The estimated usage time corresponding to the target capacitor is calculated and generated according to the staged capacitance change value and the sampling time.
[0030] By adopting the above technical solution, in the power distribution area, multiple capacitors corresponding to multiple temperature gradient intervals are matched according to the preset temperature gradient intervals; and the estimated usage time of the target is estimated based on the phased capacitance change value and sampling time within the preset sampling time before the current moment.
[0031] Optionally, the method further includes:
[0032] Calculate the total estimated time of the specific environment of the first capacitor according to the phased capacitance change value corresponding to the first capacitor and the sampling time;
[0033] Calculating an environmental impact factor according to the total estimated time of the specific environment of the first capacitor and the theoretical total use time in the theoretical attenuation curve;
[0034] Obtaining a humidity value corresponding to each of the environmental influencing factors, and dividing the humidity into a plurality of humidity gradient intervals according to a preset humidity span value;
[0035] According to the target temperature gradient interval and the target humidity gradient interval corresponding to multiple environmental influencing factors, the corresponding temperature and humidity influencing factors are calculated and generated;
[0036] Generate a plurality of estimated stage environmental information corresponding to the second capacitor according to the historical environmental information of the location where the second capacitor is installed and the preset stage evaluation duration;
[0037] Matching a plurality of temperature and humidity influencing factors according to a plurality of the estimated stage environmental information;
[0038] Obtaining the actual capacitance of the second capacitor, and gradually calculating the capacitance attenuation corresponding to the evaluation time of each stage based on the actual capacitance and multiple temperature and humidity influencing factors;
[0039] The quantity corresponding to the evaluation duration of the generation phase is calculated based on the current actual capacitance, capacitance threshold, and multiple capacitance attenuation values;
[0040] Based on the capacitance attenuation corresponding to the multiple-stage evaluation time of the target capacitor and the quantity corresponding to the multiple-stage evaluation time, a comprehensive estimated usage time is calculated and generated.
[0041] By adopting the above technical solution, according to the staged capacitance change value and sampling time of the first capacitor, the specific environment estimated total time of the first capacitor under the above environment is calculated based on the current temperature and humidity conditions of the first capacitor; the ratio of the specific environment estimated total time and the theoretical total time in the theoretical attenuation curve (here, it can be understood as the capacitance threshold) is used as the environmental influencing factor.
[0042] Then, according to multiple environmental influencing factors corresponding to the target temperature gradient interval and the target humidity gradient interval, the corresponding temperature and humidity influencing factors are calculated and generated. Based on the temperature and humidity influencing factors and the actual capacitance of the capacitor, the capacitance attenuation corresponding to the evaluation time of each stage is calculated; finally, the capacitance attenuation corresponding to the evaluation time of each stage is accumulated and calculated to obtain the final comprehensive estimated usage time, thereby obtaining a more accurate remaining lifespan.
[0043] Optionally, the step of calculating and generating corresponding temperature and humidity influence factors according to a plurality of environmental influence factors corresponding to the target temperature gradient interval and the target humidity gradient interval includes:
[0044] Summarize multiple environmental impact factors under each of the temperature gradient intervals, and divide multiple environmental impact factors corresponding to each of the humidity gradient intervals under the target temperature gradient interval;
[0045] Calculate and generate temperature and humidity influence factors according to multiple environmental influence factors corresponding to the target temperature gradient interval and the target humidity gradient interval;
[0046] A mapping relationship between the temperature and humidity influencing factor and the target temperature gradient interval and the target humidity gradient interval is established.
[0047] By adopting the above technical scheme, multiple environmental influencing factors in the same temperature gradient interval are arranged and classified according to the divided humidity gradient intervals, that is, in each humidity gradient interval, multiple humidity values are classified into environmental influencing factors corresponding to the humidity in the humidity gradient interval; then according to certain calculation rules (according to different situations, by taking the average, weighted value, nearest value, etc.), the temperature and humidity influencing factors under various environmental conditions are calculated.
[0048] Finally, a mapping relationship between the temperature and humidity influencing factors and the target temperature gradient interval and the target humidity gradient interval is established, so as to match the corresponding temperature and humidity influencing factors according to the specific environmental conditions, and thus the remaining life of the capacitor can be calculated more accurately.
[0049] In a second aspect, the present application provides a capacitance measurement module, which is applied to the capacitor inrush current suppression device mentioned in any one of the above-mentioned methods for detecting the operation of the capacitor inrush current suppression device, and is characterized in that:
[0050] The capacitance measurement module includes a power supply submodule, a current transformer, a current limiting resistor, a first switch and a second switch, wherein the power supply submodule, the first switch, the current limiting resistor and the capacitor are connected in series in sequence, one end of the second switch is connected to the current limiting resistor, and the other end is grounded;
[0051] The process of measuring the actual capacitance of the target capacitor by the capacitance measurement module includes:
[0052] Controlling the first switch to be disconnected and the second switch to be closed to discharge the capacitor;
[0053] Controlling the second switch to be disconnected and the first switch to be closed to charge the capacitor;
[0054] The current value of the real-time process is measured by a current transformer, and the current actual capacitance of the target capacitor is calculated and generated based on the real-time current value and the voltage value of the power supply submodule.
[0055] By adopting the above technical solution, when the operator needs to measure the capacitance of the capacitor, the first switch is disconnected and the second switch is closed to ground the capacitor and release the residual charge; then the second switch is disconnected and the first switch is closed to charge the capacitor, and the actual capacitance of the capacitor is calculated by monitoring the relevant current and voltage values.
[0056] Optionally, the capacitance measurement module measures the actual capacitance of the capacitor using the following formula:
[0057]
[0058] Among them, C is the actual capacitance of the capacitor, I is the current value measured by the current transformer, V is the voltage value of the current power supply submodule, and f is the current frequency of the capacitor.
[0059] By adopting the above technical solution, the actual capacitance of the capacitor is calculated based on this formula, which facilitates the estimation of the remaining life of the capacitor.
[0060] In a third aspect, the present application provides an operation detection system for a capacitor inrush current suppression device, which adopts the following technical solution:
[0061] An operation detection system for a capacitor inrush current suppression device, characterized in that it comprises:
[0062] An acquisition module, used for receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module;
[0063] A comparison module, used for comparing the current actual capacitance of the target capacitor at the current switching times with a preset capacitance threshold;
[0064] The alarm information generation module is used to generate alarm information and send the alarm information to an alarm device arranged in the surge suppression device.
[0065] In a fourth aspect, the present application provides an intelligent terminal, which adopts the following technical solution:
[0066] A smart terminal, characterized in that the smart terminal includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the processing of the smart terminal in the operation detection method of the capacitor inrush current suppression device as described in any of the above methods.
[0067] In summary, the present application includes at least one of the following beneficial technical effects:
[0068] 1. The actual capacitance of the capacitor in the current state is measured by the capacitance measurement module, and the actual capacitance is compared with the preset capacitance threshold. If the measured actual capacitance is less than or equal to the capacitance threshold, an alarm message is generated, and an alarm signal is sent through the alarm device to remind the staff to replace the capacitor that has reached the attenuation limit in time;
[0069] 2. According to the temperature and humidity influencing factors corresponding to the environment in which the capacitors in each surge current suppression device in the distribution area are located, combined with the specific temperature and humidity environment, the capacitance attenuation of the capacitors during the evaluation period of each stage in the future is estimated and calculated, and the capacitance attenuation during the evaluation period of each stage is accumulated to obtain the remaining life of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS
[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0071] Figure 1 It is a structural block diagram of the operation detection method of the capacitor inrush current suppression device provided in an embodiment of the present application.
[0072] Figure 2 It is a schematic diagram of the flow chart of calculating the estimated usage time of a capacitor provided in an embodiment of the present application.
[0073] Figure 3 It is a schematic diagram of a specific process for calculating the estimated usage time of a capacitor provided in an embodiment of the present application.
[0074] Figure 4 This is another flowchart of calculating the estimated usage time of a capacitor provided in an embodiment of the present application.
[0075] Figure 5 and Figure 6 It is a schematic diagram of the flow chart of calculating the comprehensive estimated usage time of a capacitor provided in an embodiment of the present application.
[0076] Figure 7 It is a flowchart of establishing a mapping relationship during the calculation of the comprehensive estimated usage time of a capacitor provided by an embodiment of the present application.
[0077] Figure 8 It is a system block diagram of the operation detection system of the capacitor inrush current suppression device provided in an embodiment of the present application.
[0078] Fig. 9 It is a structural block diagram of the intelligent terminal provided in the embodiment of the present application. DETAILED DESCRIPTION
[0079] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will be combined with the attached Figure 1-9 The embodiments of the present invention are described in further detail.
[0080] An embodiment of the present application provides an operation monitoring method for a capacitor inrush current suppression device.
[0081] The following will be combined with specific implementation methods. Figures 1 to 6 The relevant processing flow shown in the figure is used to explain in detail the operation detection method of the capacitor inrush current suppression device, as follows:
[0082] The method is applied to a surge current suppression device, wherein a capacitance measurement module is provided in the surge current suppression device, and the capacitance measurement module is used to measure the capacitance of the capacitor in the surge current suppression device, such as Figure 1 As shown, the method includes:
[0083] S101, receiving feedback from a capacitance measurement module on an actual capacitance of a target capacitor at a current switching number.
[0084] In implementation, the actual capacitance of the capacitor at the current switching times is measured by a capacitance measurement module, and the capacitance measurement module is arranged in the surge current suppression device and is compatible with the basic operation of the surge current suppression device.
[0085] S102: Compare the current actual capacitance of the target capacitor at the current switching times with a preset capacitance threshold.
[0086] In implementation, the preset capacitance threshold is the minimum working standard capacitance value of the capacitor, that is, the attenuation limit threshold. By comparing the actual capacitance of the capacitor with the preset capacitance threshold, it is possible to determine whether the capacitor has reached the attenuation limit.
[0087] S103: If the current actual capacitance of the target capacitor at the current switching times is less than or equal to a preset capacitance threshold, an alarm message is generated and sent to an alarm device disposed in the inrush current suppression device.
[0088] In implementation, when it is determined that the actual capacitance of the target capacitor is less than or equal to the preset capacitance threshold, an alarm message is generated, and the alarm device is triggered by the alarm message. The alarm device sends an alarm signal to the operator. The alarm signal here can be a signal that is easy to detect and identify, such as flashing lights or honking horns.
[0089] Optionally, after receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module, such as Figure 2 As shown, the following steps are also included:
[0090] S201. Obtain the usage time of a target capacitor and a theoretical capacitance value corresponding to the usage time.
[0091] In practice, capacitors of different batches and models will be subjected to capacitance attenuation tests before leaving the factory. The test items include measuring the capacitance of the capacitors after different usage periods under a certain theoretical environment.
[0092] The usage time in S201 here refers to the usage time of the capacitor under the theoretical environment, and the theoretical capacitance corresponding to the usage time refers to the capacitance after the use of the capacitor under the theoretical environment, providing a theoretical basis and data support for the attenuation prediction of the capacitor.
[0093] S202 , establishing a theoretical attenuation curve of the target capacitor with the usage time of the target capacitor as the horizontal axis and the theoretical capacitance corresponding to the usage time of the target capacitor as the vertical axis.
[0094] In the implementation, a curve of the change of the theoretical capacitance with respect to the use time of the capacitor is established in a two-dimensional coordinate system. Specifically, the position of each coordinate point is first located in the two-dimensional coordinate system in chronological order, and then a smooth curve is used to connect two adjacent coordinate points to form a theoretical attenuation curve of the capacitor.
[0095] Capacitors are constantly affected by the environment and decay with use. In the theoretical decay curve, the theoretical capacitance gradually decreases with the length of use, and different lengths of use have a unique theoretical capacitance corresponding to them.
[0096] S203: Obtain an estimated usage time of the target capacitor based on the measured actual capacitance value and theoretical attenuation curve of the target capacitor.
[0097] In implementation, the estimated service life of the capacitor is calculated and inferred through the established theoretical attenuation curve of the capacitor and the actual capacitance measured by the capacitance measurement module, so that the operator can specify the maintenance cycle of the capacitor and maintain the normal operation of the equipment.
[0098] Optionally, the specific processing steps of step 203 can be as follows: Figure 3 As shown, the specific process is as follows:
[0099] S301 , obtaining an actual time length t1 corresponding to an actual capacitance value, and obtaining a theoretical time length t2 corresponding to an actual capacitance value from a theoretical attenuation curve.
[0100] In implementation, the actual capacitance of the capacitor is obtained through the capacitance measurement module, and after obtaining the actual time length t1 corresponding to the actual capacitance, the coordinate point containing the capacitance is obtained in the theoretical attenuation curve based on the actual capacitance, and the theoretical time length t2 corresponding to the coordinate point on the horizontal curve is obtained.
[0101] S302 , obtaining a theoretical time length t3 corresponding to the capacitance threshold in the theoretical attenuation curve.
[0102] In implementation, in the theoretical attenuation curve, the theoretical time length t3 corresponding to the capacitance threshold is obtained. The theoretical time length t3 here refers to the total time from the start of the capacitor being put into use to the end of the capacitor reaching the capacitance attenuation limit.
[0103] S303, based on the actual duration t1, the theoretical duration t2 and the theoretical duration t3, the estimated usage duration t4 is calculated according to the following formula:
[0104]
[0105] In practice, the calculation formula for the estimated service life t4 of the capacitor is derived as follows:
[0106]
[0107] In the above derivation formula, the actual duration t1, theoretical duration t2 and theoretical duration t3 are all known quantities, and the estimated usage time t4 of the capacitor is the only unknown quantity. Therefore, by solving the estimated usage time t4 of the capacitor through the above formula, the specific value of the estimated usage time t4 can be obtained.
[0108] Factors affecting the service life of capacitors include temperature, humidity, voltage, equipment materials and structure, etc. Among them, temperature and humidity conditions are the main influencing factors. Temperature conditions and humidity environment will be mentioned many times in the following text. They are the main technical parameters referenced by this method.
[0109] Optionally, the specific processing steps of step 203 can also be as follows Figure 4 As shown, the specific process is as follows:
[0110] S401. Divide a plurality of temperature gradient intervals according to a preset temperature span value, and match a plurality of capacitors corresponding to the plurality of temperature gradient intervals in a power distribution area.
[0111] During implementation, the difference between the historical highest temperature and the historical lowest temperature at the distribution area is divided into several temperature gradient intervals according to the preset temperature span value, and within the distribution area, the capacitors corresponding to the temperature at each capacitor assembly position are divided into corresponding temperature gradient intervals according to the temperature.
[0112] S402: Obtain phased capacitance change values of a plurality of capacitors within a preset sampling time period before the current moment.
[0113] In implementation, the periodic capacitance change value of the capacitor before the current moment and within a preset sampling time period is obtained, so as to calculate and generate the estimated use time of the capacitor based on the periodic capacitance change value.
[0114] S403: Calculate and generate an estimated usage time corresponding to the target capacitor according to the phased capacitance change value and the sampling time.
[0115] In implementation, the estimated service life is calculated based on the staged capacitance change value and sampling time of the electric heater. Compared with the estimated service life calculation method in steps S301-S303, this method (i.e., the method described in S401-S403) is more suitable for capacitor life estimation in environments with large climate changes and long time spans.
[0116] Optional, such as Figure 5 and Figure 6 As shown, the method further comprises the following steps:
[0117] S501 : Calculate a specific environment estimation total duration of the first capacitor according to a phased capacitance change value and a sampling duration corresponding to the first capacitor.
[0118] In implementation, the environment in which the first electric heater is located is taken as the specific environment (including temperature conditions and humidity conditions), and the estimated total time of the first capacitor in the specific environment is calculated based on the staged capacitance change value and sampling time of the first capacitor.
[0119] S502 : Calculate an environmental impact factor according to the total environmental estimation time of the first capacitor and the theoretical total use time in the theoretical attenuation curve.
[0120] In practice, the calculation formula of the environmental impact factor is as follows:
[0121]
[0122] Wherein, k is the environmental impact factor of the capacitor, T1 is the estimated total time of the capacitor in a specific environment under a specific environment, and T2 is the theoretical usage time of the capacitor.
[0123] S503: Obtain the humidity value corresponding to each environmental influencing factor, and divide the humidity into multiple humidity gradient intervals according to a preset humidity span value.
[0124] In implementation, for the environmental impact factors of multiple capacitors in one temperature gradient interval, the multiple environmental impact factors are divided into multiple sub-intervals according to the preset humidity gradient interval, that is, multiple environmental impact factors are included in different humidity gradient intervals to facilitate data screening and analysis.
[0125] S504: Calculate and generate corresponding temperature and humidity influence factors according to a plurality of environmental influence factors corresponding to the target temperature gradient interval and the target humidity gradient interval.
[0126] In implementation,.
[0127] S505 . Generate a plurality of estimated stage environmental information corresponding to the second capacitor according to the historical environmental information of the installation position of the second capacitor and the preset stage evaluation duration.
[0128] In implementation, the historical environmental information is generated based on the weather and climate conditions of the area, including temperature and humidity conditions. According to the historical environmental information and the preset stage evaluation duration, the estimated stage environmental information of the second capacitor in the future multiple stage evaluation durations is generated.
[0129] S506: Match multiple temperature and humidity influencing factors according to multiple estimation stage environmental information.
[0130] In implementation, after the environmental information of the second capacitor in multiple future estimated stages is determined, the evaluation duration for each stage is matched with the corresponding temperature and humidity influencing factors.
[0131] S507: Obtain the actual capacitance of the second capacitor, and gradually calculate the capacitance attenuation corresponding to the evaluation time of each stage based on the actual capacitance and multiple temperature and humidity influencing factors.
[0132] In implementation, the actual environment of the second capacitor is taken as the specific environment, and the calculation formula of the environmental impact factor k is analogized to the stage evaluation time under the specific environment. At this time, the temperature and humidity impact factors are known quantities, and the theoretical usage time corresponding to the stage evaluation time is also a known quantity. Therefore, the usage time after attenuation within the stage evaluation time under the specific environment can be calculated.
[0133] By tracing back the "usage time after attenuation" in the capacitance attenuation curve under a specific environment (the process of establishing this curve is the same as that of the theoretical attenuation curve, which will not be repeated here), we can obtain the capacitance value after attenuation within the stage evaluation period, that is, the capacitance attenuation amount.
[0134] Taking the capacitance attenuation as the starting value, the capacitance attenuation after the next stage of evaluation is estimated. At that time, the next actual environment is taken as the specific environment, and the above steps are repeated. Similarly, the capacitance attenuation corresponding to each subsequent stage of evaluation is gradually calculated until the capacitor decays to the capacitance threshold.
[0135] S508: Calculate the quantity corresponding to the evaluation duration of the generation phase based on the current actual capacitance, the capacitance threshold, and the plurality of capacitance attenuation amounts.
[0136] In practice, the capacitor reaches a capacitance threshold after attenuation during multiple stages of evaluation time, that is, the actual capacitance is subtracted from the capacitance attenuation corresponding to each stage of evaluation time, and finally reaches the capacitance threshold. Then, the number of stage evaluation times can be obtained by simply counting the number of capacitance attenuations.
[0137] S509: Calculate and generate a comprehensive estimated usage time based on the capacitance attenuation corresponding to the multiple stage evaluation time of the target capacitor and the quantity corresponding to the multiple stage evaluation time.
[0138] In implementation, the unit duration of the evaluation duration of each stage is deducted from the "usage duration after attenuation" corresponding to the capacitance attenuation of that stage to obtain the duration change within that stage.
[0139] The comprehensive estimated usage time is obtained by multiplying the unit duration of the stage evaluation time by the number of stage evaluation time, and gradually subtracting the duration changes corresponding to multiple stage evaluation time.
[0140] Optionally, the specific processing steps of step S504 are as follows: Figure 7 As shown, the specific process is as follows:
[0141] S601: Summarize multiple environmental impact factors in each temperature gradient interval, and divide multiple environmental impact factors corresponding to each humidity gradient interval in the target temperature gradient interval.
[0142] In implementation, multiple environmental impact factors in each temperature gradient interval are divided according to humidity conditions, that is, multiple environmental impact factors are included in each humidity gradient interval.
[0143] S602: Calculate and generate temperature and humidity influencing factors according to a plurality of environmental influencing factors corresponding to a target temperature gradient interval and a target humidity gradient interval.
[0144] During implementation, in the process of calculating the temperature and humidity influence factors, the temperature and humidity influence factors are calculated according to the specific environment in which the capacitor in the surge current suppression device is located. First, the temperature gradient interval is located according to the temperature conditions of the specific environment, and then the humidity gradient interval is located according to the humidity conditions of the specific environment.
[0145] If the humidity condition of a specific environment is in the middle of a certain humidity gradient interval, the environmental influencing factors within the interval are averaged to obtain the temperature and humidity influencing factors in the specific environment.
[0146] If the humidity condition of a specific environment is not in the middle, the temperature and humidity influence factor of the specific environment is obtained according to the weight calculation.
[0147] If the humidity conditions of a specific environment do not fall within the corresponding temperature gradient interval, then the nearest environmental influencing factor is selected as the temperature and humidity influencing factor for the specific environment.
[0148] S603: Establish a mapping relationship between the temperature and humidity influencing factors and the target temperature gradient interval and the target humidity gradient interval.
[0149] In implementation, a mapping relationship between the temperature and humidity influencing factors and the target temperature gradient interval and the target humidity gradient interval is established to facilitate matching of the temperature and humidity influencing factors according to specific temperature conditions and humidity conditions.
[0150] The embodiment of the present application further discloses a capacitance measurement module, which is applied to the capacitor inrush current suppression device mentioned in the operation detection method of the capacitor inrush current suppression device.
[0151] The capacitance measurement module includes a power supply submodule, a current transformer, a current limiting resistor, a first switch and a second switch. The power supply submodule, the first switch, the current limiting resistor and the capacitor are connected in series in sequence. One end of the second switch is connected to the current limiting resistor and the other end is grounded.
[0152] The process of measuring the actual capacitance of the target capacitor by the capacitance measurement module includes:
[0153] Controlling the first switch to open and the second switch to close to discharge the capacitor;
[0154] Controlling the second switch to open and the first switch to close to charge the capacitor;
[0155] The current value of the real-time process is measured by a current transformer, and the current actual capacitance of the target capacitor is calculated and generated based on the real-time current value and the voltage value of the power supply submodule.
[0156] Optionally, the capacitance measurement module measures the actual capacitance of the capacitor using the following formula:
[0157]
[0158] Among them, C is the actual capacitance of the capacitor, I is the current value measured by the current transformer, V is the voltage value of the current power supply submodule, and f is the current frequency of the capacitor.
[0159] In implementation, when the operator needs to measure the capacitance of the capacitor, the first switch is opened and the second switch is closed to ground the capacitor and release the residual charge; then the second switch is opened and the first switch is closed to charge the capacitor, and the actual capacitance of the capacitor is calculated by monitoring the relevant current and voltage values.
[0160] The present application also discloses an operation detection system for a capacitor inrush current suppression device, such as Figure 8 As shown, the system includes an acquisition module, a comparison module and an alarm information generation module.
[0161] The acquisition module is used to receive the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module.
[0162] The comparison module is used to compare the current actual capacitance of the target capacitor under the current switching times with the preset capacitance threshold.
[0163] The alarm information generation module is used to generate alarm information and send the alarm information to an alarm device arranged in the surge suppression device.
[0164] The present application also discloses a smart terminal, such as Fig. 9 shown.
[0165] The intelligent terminal may have relatively large differences due to different configurations or performances, and may include one or more central processing units (e.g., one or more processors) and memories, and one or more storage media (e.g., one or more mass storage devices) for storing applications or data. The memories and storage media may be short-term storage or permanent storage. The program stored in the storage medium may include one or more modules (not shown in the figure), and each module may include a series of instruction operations on the intelligent terminal.
[0166] The intelligent terminal may also include one or more power supplies, one or more wired or wireless network interfaces, one or more input and output interfaces, one or more keyboards, and / or one or more operating systems.
[0167] The intelligent terminal may include a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by one or more processors. The one or more programs include the processing of the intelligent terminal in the operation detection method of the above-mentioned capacitor inrush current suppression device.
[0168] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program. The program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, etc.
[0169] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A method for monitoring the operation of a capacitor inrush current suppression device, characterized in that: The method is applied to a surge current suppression device, wherein a capacitance measurement module is provided in the surge current suppression device, and the capacitance measurement module is used to measure the capacitance of a capacitor in the surge current suppression device. The method comprises: receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module; Comparing the current actual capacitance of the target capacitor at the current switching times with a preset capacitance threshold; If the current actual capacitance of the target capacitor at the current switching times is less than or equal to the preset capacitance threshold, an alarm message is generated and sent to an alarm device arranged in the inrush current suppression device.
2. The operation monitoring method of a capacitor inrush current suppression device according to claim 1, characterized in that: After receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module, the method further includes: Obtaining the usage time of the target capacitor and the theoretical capacitance value corresponding to the usage time; The theoretical attenuation curve of the target capacitor is established by taking the service life of the target capacitor as the horizontal axis and the theoretical capacitance corresponding to the service life of the target capacitor as the vertical axis; Based on the measured actual capacitance of the target capacitor and the theoretical attenuation curve, an estimated usage time of the target capacitor is obtained.
3. The operation monitoring method of a capacitor inrush current suppression device according to claim 2, characterized in that: The obtaining, based on the measured actual capacitance of the target capacitor and the theoretical attenuation curve, an estimated service life of the target capacitor includes: Obtain the actual duration t1 corresponding to the actual capacitance value, and obtain the theoretical duration t2 corresponding to the actual capacitance value in the theoretical attenuation curve; Obtain the theoretical time t3 corresponding to the capacitance threshold in the theoretical attenuation curve; Based on the actual duration t1, the theoretical duration t2 and the theoretical duration t3, the estimated usage duration t4 is calculated according to the following formula:
4. The operation monitoring method of a capacitor inrush current suppression device according to claim 2, characterized in that: The obtaining, based on the measured actual capacitance of the target capacitor and the theoretical attenuation curve, an estimated service life of the target capacitor includes: Divide a plurality of temperature gradient intervals according to a preset temperature span value, and match a plurality of capacitors corresponding to the plurality of temperature gradient intervals in the power distribution area; Obtaining phased capacitance change values of a plurality of the capacitors within a preset sampling time before the current moment; The estimated usage time corresponding to the target capacitor is calculated and generated according to the staged capacitance change value and the sampling time.
5. The operation monitoring method of a capacitor inrush current suppression device according to claim 4, characterized in that: The method further comprises: Calculate the total estimated time of the specific environment of the first capacitor according to the phased capacitance change value corresponding to the first capacitor and the sampling time; Calculating an environmental impact factor according to the total estimated time of the specific environment of the first capacitor and the theoretical total use time in the theoretical attenuation curve; Obtaining a humidity value corresponding to each of the environmental influencing factors, and dividing the humidity into a plurality of humidity gradient intervals according to a preset humidity span value; According to the target temperature gradient interval and the target humidity gradient interval corresponding to multiple environmental influencing factors, the corresponding temperature and humidity influencing factors are calculated and generated; Generate a plurality of estimated stage environmental information corresponding to the second capacitor according to the historical environmental information of the location where the second capacitor is installed and the preset stage evaluation duration; Matching a plurality of temperature and humidity influencing factors according to a plurality of the estimated stage environmental information; Obtaining the actual capacitance of the second capacitor, and gradually calculating the capacitance attenuation corresponding to the evaluation time of each stage based on the actual capacitance and multiple temperature and humidity influencing factors; The quantity corresponding to the evaluation duration of the generation phase is calculated based on the current actual capacitance, capacitance threshold, and multiple capacitance attenuation values; Based on the capacitance attenuation corresponding to the multiple-stage evaluation time of the target capacitor and the quantity corresponding to the multiple-stage evaluation time, a comprehensive estimated usage time is calculated and generated.
6. The operation monitoring method of a capacitor inrush current suppression device according to claim 5, characterized in that: The method of calculating and generating corresponding temperature and humidity influence factors according to the target temperature gradient interval and the target humidity gradient interval corresponding to multiple environmental influence factors includes: Summarize multiple environmental impact factors under each of the temperature gradient intervals, and divide multiple environmental impact factors corresponding to each of the humidity gradient intervals under the target temperature gradient interval; Calculate and generate temperature and humidity influence factors according to multiple environmental influence factors corresponding to the target temperature gradient interval and the target humidity gradient interval; A mapping relationship between the temperature and humidity influencing factor and the target temperature gradient interval and the target humidity gradient interval is established.
7. A capacitance measurement module, applied to the capacitor inrush current suppression device mentioned in the operation detection method of the capacitor inrush current suppression device in any one of claims 1 to 6, characterized in that ； The capacitance measurement module includes a power supply submodule, a current transformer, a current limiting resistor, a first switch and a second switch, wherein the power supply submodule, the first switch, the current limiting resistor and the capacitor are connected in series in sequence, one end of the second switch is connected to the current limiting resistor, and the other end is grounded; The process of measuring the actual capacitance of the target capacitor by the capacitance measurement module includes: Controlling the first switch to be disconnected and the second switch to be closed to discharge the capacitor; Controlling the second switch to be disconnected and the first switch to be closed to charge the capacitor; The current value of the real-time process is measured by a current transformer, and the current actual capacitance of the target capacitor is calculated and generated based on the real-time current value and the voltage value of the power supply submodule.
8. A capacitance measurement module, characterized in that: The formula for measuring the actual capacitance of the capacitor by the capacitance measurement module is as follows: Among them, C is the actual capacitance of the capacitor, I is the current value measured by the current transformer, V is the voltage value of the current power supply submodule, and f is the current frequency of the capacitor.
9. An operation detection system for a capacitor inrush current suppression device, characterized in that: include, An acquisition module, used for receiving the actual capacitance of the target capacitor at the current switching times fed back by the capacitance measurement module; A comparison module, used for comparing the current actual capacitance of the target capacitor at the current switching times with a preset capacitance threshold; The alarm information generation module is used to generate alarm information and send the alarm information to an alarm device arranged in the surge suppression device.
10. An intelligent terminal, characterized in that: The intelligent terminal includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement the processing of the intelligent terminal in the operation detection method of the capacitor inrush current suppression device according to any one of claims 1 to 6.