Wiring terminal voltage detection method, device and system

Abstract

The invention relates to the technical field of electrical equipment electrical performance detection, in particular to a wiring terminal voltage detection method, device and system, and the method comprises the steps: obtaining the voltage stability of each voltage data point according to the voltage data of the two ends of a wiring terminal, obtaining the voltage and current change rule characteristics according to the voltage drop and current of the same voltage data point, and obtaining the voltage stability of each voltage data point; according to the method, the transient overvoltage dynamic change characteristics of the same voltage data point at the two ends of the wiring terminal are obtained, so that the voltage anomalies of the voltage data points are obtained, a correction coefficient is obtained according to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at the two ends of the wiring terminal, the voltage anomalies are corrected, and fault detection is performed on the wiring terminal according to the corrected voltage anomalies. According to the method, the influence of transient overvoltage on voltage fluctuation can be identified, false abnormity of the voltage and real voltage fluctuation can be effectively distinguished, the fault detection accuracy of the wiring terminal is improved, and the operation safety and stability of a power system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical performance detection of electrical equipment, and in particular to a method, device and system for detecting voltage of a connection terminal. Background Art

[0002] Terminal blocks are key components of electrical connections, and their reliability and stability are crucial. In actual use, terminal blocks may cause safety hazards due to poor contact, wear, temperature rise, etc. By detecting the voltage of the terminal blocks, the safety and stability of the electrical system can be ensured. The existing terminal block voltage detection method mainly relies on traditional voltmeter measurement. Although it can reflect the instantaneous state of the voltage, it cannot capture transient changes and dynamic processes in real time, and the detection accuracy is low. Therefore, sensors are used to monitor the voltage of the terminal blocks in real time, and high-precision and real-time voltage detection is achieved by analyzing and processing the changing characteristics of the voltage data.

[0003] In the prior art, in the voltage monitoring of the terminal block, sensors are usually used to monitor the voltage at both ends of the terminal block in real time. By analyzing the abnormal fluctuations of the voltage data, it is possible to preliminarily determine whether the voltage is abnormal, thereby inferring the working state of the terminal block. However, in the actual application of the terminal block, voltage detection is easily affected by factors such as load current, environmental factors (such as temperature, humidity), and electromagnetic interference, which may cause pseudo-abnormal fluctuations; in addition, the terminal block may also experience transient overvoltage phenomena during operation, which will cause rapid fluctuations in voltage and current. Simply analyzing the voltage data is not enough to accurately reflect the actual voltage state, and thus it is impossible to accurately detect faults in the terminal block. Summary of the invention

[0004] In order to solve the technical problem of low accuracy of the existing terminal fault detection method, the purpose of the present invention is to provide a terminal voltage detection method, device and system, and the technical solution adopted is as follows: In a first aspect of the present invention, a method for detecting a voltage of a connection terminal is provided, comprising: Obtain voltage data and current data at both ends of the terminal; According to the voltage data, obtaining the voltage stability of each voltage data point; Obtaining voltage and current variation regularity characteristics according to a voltage drop of a same voltage data point at both ends of the wiring terminals in the voltage data and a current corresponding to the same voltage data point in the current data; According to the voltage and current variation law characteristics and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained; According to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the wiring terminal, the transient overvoltage performance degree of each voltage data point is obtained; Correcting the voltage anomaly according to the transient overvoltage performance to obtain a target voltage anomaly; According to the target voltage abnormality of each voltage data point, fault detection is performed on the connection terminal.

[0005] In an exemplary embodiment, obtaining the voltage stability of each voltage data point according to the voltage data includes: Segmenting the voltage data at both ends of the wiring terminal according to the same segmentation rule to obtain a plurality of voltage data segments corresponding to each end of the wiring terminal; Obtaining a difference distance between the voltage data segment and a reference voltage data segment, and obtaining a difference in voltage change degree between each voltage data point in the voltage data segment and a voltage data point at a corresponding position in the reference voltage data segment; According to the difference between the difference distance and the voltage change degree, a trend deviation of the voltage data point is obtained; the trend deviation is proportional to the difference between the difference distance and the voltage change degree; The voltage stability of the voltage data points is obtained according to the trend deviation of the voltage data points corresponding to the two ends of the wiring terminals; the voltage stability is inversely proportional to the trend deviation of the voltage data points corresponding to the two ends of the wiring terminals.

[0006] In an exemplary embodiment, obtaining voltage and current variation law characteristics according to a voltage drop of a same voltage data point at both ends of a wiring terminal in the voltage data and a current corresponding to the same voltage data point in the current data includes: Obtaining a ratio of a voltage drop corresponding to each voltage data point to a current value corresponding to the voltage data point as a voltage-current variation relationship of the corresponding voltage data point; the voltage drop is a difference in voltage values ​​of the same voltage data point at both ends of the wiring terminal; According to the voltage-current variation relationship between any two adjacent voltage data points, the voltage-current variation regularity characteristics are obtained.

[0007] In an exemplary embodiment, the voltage and current variation regularity characteristics are obtained according to the voltage and current variation relationship between any two adjacent voltage data points, including: Calculate the difference in the voltage-current variation relationship between any two adjacent voltage data points; The difference between the voltage-current variation relationship of any two adjacent voltage data points is integrated to obtain the overall difference between the voltage-current variation relationship; According to the overall difference of the voltage-current variation relationship, a voltage-current variation law characteristic is obtained, and the voltage-current variation law characteristic is inversely proportional to the overall difference of the voltage-current variation relationship.

[0008] In an exemplary embodiment, the voltage anomaly of each voltage data point is obtained according to the voltage and current variation law characteristics and the voltage stability of each voltage data point, including: Obtaining a difference between the voltage and current variation law characteristic and a preset reference voltage and current variation law characteristic to obtain a voltage and current variation law characteristic difference; The voltage anomaly of each voltage data point is obtained according to the characteristic difference of the voltage and current variation law and the voltage stability of each voltage data point; the voltage anomaly is proportional to the characteristic difference of the voltage and current variation law and inversely proportional to the voltage stability.

[0009] In an exemplary embodiment, according to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the wiring terminal, the transient overvoltage performance of each voltage data point is obtained, including: According to the voltage extreme difference of the voltage data segment where each voltage data point is located and the voltage change degree of each voltage data point, the transient overvoltage dynamic change characteristics of each voltage data point are obtained; the transient overvoltage dynamic change characteristics are proportional to the voltage extreme difference and the voltage change degree; Obtain the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the terminal; According to the difference between the transient overvoltage dynamic change characteristics, a transient overvoltage performance degree is obtained; the transient overvoltage performance degree is inversely proportional to the difference between the transient overvoltage dynamic change characteristics.

[0010] In an exemplary embodiment, the voltage anomaly is corrected according to the transient overvoltage manifestation to obtain a target voltage anomaly, including: Obtaining a correction coefficient for each voltage data point according to the transient overvoltage performance degree of each voltage data point, wherein the correction coefficient is inversely proportional to the transient overvoltage performance degree; The correction coefficient of each voltage data point is multiplied by the voltage anomaly of each voltage data point, and the obtained product is the target voltage anomaly of each voltage data point.

[0011] In an exemplary embodiment, performing fault detection on the connection terminal according to target voltage abnormality of each voltage data point includes: comparing the target voltage abnormality of each voltage data point with a preset voltage abnormality threshold; If there are a preset number of target voltage abnormalities that are greater than or equal to a preset voltage abnormality threshold, it is determined that there is a fault in the connection terminal.

[0012] In a second aspect of the present invention, a terminal voltage detection device is provided, the terminal voltage detection device comprising a unit for executing the above-mentioned terminal voltage detection method.

[0013] In a third aspect of the present invention, a terminal block voltage detection system is provided, comprising: a memory and a processor; the memory is connected to the processor; the memory is used to store program instructions; the processor is used to implement the above-mentioned terminal block voltage detection method when the program instructions are executed.

[0014] The present invention has the following beneficial effects: the present invention first obtains the voltage stability of each voltage data point, and then obtains the voltage and current variation law characteristics according to the voltage drop of the same voltage data point at both ends of the wiring terminal and the current corresponding to the same voltage data point, and combines the relationship between the current of the wiring terminal and the voltage drop on both sides, so as to effectively eliminate the influence of interference factors on the voltage detection result and ensure the reliability of the data; thus, according to the voltage and current variation law characteristics and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained, and according to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the wiring terminal, the transient overvoltage performance of each voltage data point is obtained, and the voltage anomaly is corrected according to the transient overvoltage performance to obtain the target voltage anomaly, which is helpful to identify the influence of transient overvoltage on voltage fluctuation, and can effectively distinguish between pseudo-abnormality of voltage and real voltage fluctuation, so as to perform fault detection on the wiring terminal according to the target voltage anomaly of each voltage data point, and can improve the fault detection accuracy of the wiring terminal, thereby improving the safety and stability of the power system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a flow chart of a method for detecting voltage of a connection terminal provided by an embodiment of the present invention; Figure 2 is a normal sinusoidal voltage waveform diagram provided by an embodiment of the present invention; Figure 3 A sine wave voltage waveform diagram with a peak voltage signal provided by an embodiment of the present invention; Figure 4 is a flow chart of obtaining voltage stability provided by an embodiment of the present invention; Figure 5 It is a flow chart for obtaining the characteristics of voltage and current variation rules provided by an embodiment of the present invention; Figure 6 is a flowchart of step S32 provided by an embodiment of the present invention; Figure 7 is a flowchart for obtaining voltage anomaly provided by an embodiment of the present invention; Figure 8 is a flow chart for obtaining transient overvoltage performance provided by an embodiment of the present invention; Fig. 9 is a flow chart for obtaining target voltage abnormality provided by an embodiment of the present invention; Fig.10 The present invention is a flowchart of fault detection for a connection terminal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0017] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0018] The present embodiment provides a terminal voltage detection method for detecting faults in the terminal. First, a detection device needs to be constructed, including a voltage sensor and a current sensor. There are two voltage sensors, one of which is set at one end of the terminal, and the other voltage sensor is set at the other end of the terminal, for respectively detecting the voltage at both ends of the terminal. According to the current characteristics, the current at both ends of the terminal is the same, so only one current sensor needs to be set, which is set at one end of the terminal to detect the current flowing in the terminal.

[0019] In this embodiment, the voltage connected to the terminal is an AC voltage, that is, the output detection voltage is an AC voltage, that is, a sine wave voltage. Correspondingly, the voltage sensor and the current sensor are an AC voltage sensor and an AC current sensor, respectively. The specific selection of the voltage sensor and the current sensor is set according to actual needs and is not limited in this embodiment.

[0020] It should be understood that the wiring terminal can be tested in actual applications or in the early experimental stage. If the detection is performed in the early experimental stage, then both ends of the wiring terminal are connected to an AC voltage source, and the AC voltage source is used to output a detection voltage to the wiring terminal. The implementer can make a selection according to the actual situation, and this embodiment does not limit it.

[0021] The voltage sensor and the current sensor output voltage signals and current signals in real time. In an exemplary embodiment, the analog signal can be converted into a digital signal by an analog to digital converter (ADC), and input into a data processing system for further digital signal processing. The data processing process executed in the data processing system is a terminal voltage detection method provided by this embodiment.

[0022] The terminal voltage detection method provided in this embodiment can detect the voltage of the terminal, which helps to detect voltage anomalies in time, ensure the safe and stable operation of the terminal, and avoid potential faults and damage. In the process of voltage detection, the real-time monitored voltage data is analyzed, and the potential voltage problem of the terminal is identified through the change trend of the voltage data, thereby realizing fault detection of the terminal.

[0023] like Figure 1 As shown, this embodiment provides a terminal voltage detection method, including: Step S1: Obtain voltage data and current data at both ends of the wiring terminal.

[0024] The data sampling frequency of the voltage sensor and the current sensor is the same, and the voltage sensor and the current sensor collect data synchronously, so that at a certain sampling moment, the voltage at one end of the terminal and the other end of the terminal, as well as the current flowing in the terminal can be obtained respectively.

[0025] The voltage data is collected by two voltage sensors respectively arranged at both ends of the wiring terminal, including the voltage data at one end of the wiring terminal and the voltage data at the other end of the wiring terminal. The current data is collected by a current sensor arranged at the wiring terminal.

[0026] In an exemplary embodiment, the collected voltage and current data may also be pre-processed, such as filtering, amplifying, denoising, etc., to ensure the accuracy and reliability of the measurement results.

[0027] Since the voltage is AC voltage, the voltage of the terminal remains stable during normal operation, without obvious mutations or abnormal fluctuations, and presents periodic changes. Therefore, the normal voltage data should be sinusoidal voltage data, with a waveform such as Figure 2 As shown. It is composed of multiple sine waves, each sine wave is one cycle. Correspondingly, the current data is also a sine wave. When the voltage has an instantaneous spike, there will be a spike voltage signal in the sine wave voltage waveform curve, such as Figure 3 shown.

[0028] It should be understood that the detection time of the connection terminal is set according to actual needs. In order to ensure the detection accuracy, it can be appropriately set to be longer. Therefore, the voltage data and current data include multiple sine wave cycles.

[0029] The voltage data at both ends of the wiring terminal is time series data, including the voltages at multiple sampling moments at both ends of the wiring terminal; the current data at the wiring terminal is also time series data, including the currents at multiple sampling moments of the wiring terminal.

[0030] Step S2: Obtaining the voltage stability of each voltage data point according to the voltage data.

[0031] The voltage stability of each voltage data point in the voltage data can be obtained through the voltage data of the wiring terminal. Figure 4 As shown in Figure 1, the process of obtaining voltage stability includes: Step S21: segmenting the voltage data at both ends of the connection terminal according to the same segmentation rule to obtain a plurality of voltage data segments corresponding to each end of the connection terminal.

[0032] In an exemplary embodiment, since the voltage data is waveform data with periodicity, the voltage data is segmented according to the waveform period.

[0033] In order to improve the accuracy of data processing, in this embodiment, the voltage data is composed of several complete cycles of voltage sine waves; the current data is composed of several complete cycles of current sine waves. If the data at the starting position and the end position in the initially acquired voltage data and current data are incomplete cycle sine waves, it is necessary to cut off and discard these incomplete cycle sine waves, so as to obtain voltage data composed of several complete cycles of voltage sine waves, and current data composed of several complete cycles of current sine waves. Alternatively, when collecting data, start collecting from the start time of a certain cycle, and then end collecting at the end time of a certain cycle to obtain data information of multiple complete cycles.

[0034] For the convenience of explanation, the voltage data at one end of the connection terminal is defined as the first voltage data, and the voltage data at the other end of the connection terminal is defined as the second voltage data.

[0035] The first voltage data is segmented according to the voltage cycle to obtain a plurality of voltage data segments corresponding to the first voltage data. The voltage cycle is a known value. As another implementation method, Fourier transform can also be used to convert the voltage data from the time domain to the frequency domain. The main frequency component in the spectrum corresponds to the main periodic change of the voltage data to obtain the period of the voltage data. Similarly, the second voltage data is segmented according to the voltage cycle to obtain a plurality of voltage data segments corresponding to the second voltage data. Since the voltage data and the current data have the same cycle and there is a corresponding relationship, the current data is segmented according to the voltage cycle to obtain a plurality of current data segments corresponding to the current data. Then, each voltage data segment is a complete cycle of a voltage sine wave, and each current data segment is a complete cycle of a current sine wave.

[0036] Since the first voltage data and the second voltage data have a corresponding relationship in time sequence, each voltage data segment corresponding to the first voltage data and each voltage data segment corresponding to the second voltage data also have a one-to-one corresponding relationship. That is, the i-th voltage data segment of the first voltage data and the i-th voltage data segment of the second voltage data are corresponding voltage data segments, and the i-th voltage data segment of the first voltage data and the i-th voltage data segment of the second voltage data contain the same number of voltage data points, and the voltage data points at the same position have a corresponding relationship, that is, the q-th voltage data point in the i-th voltage data segment of the first voltage data and the q-th voltage data point in the i-th voltage data segment of the second voltage data are a pair of voltage data points with a corresponding relationship.

[0037] Moreover, the i-th voltage data segment of the first voltage data also corresponds to the i-th current data segment of the current data, and the i-th voltage data segment of the first voltage data and the i-th current data segment of the current data contain the same number of data points, and there is a corresponding relationship between the data points at the same position, that is, there is a corresponding relationship between the q-th voltage data point in the i-th voltage data segment of the first voltage data and the q-th current data point in the i-th current data segment of the current data.

[0038] Step S22: obtaining a difference distance between the voltage data segment and the reference voltage data segment, and obtaining a difference in voltage change degree between each voltage data point in the voltage data segment and a voltage data point at a corresponding position in the reference voltage data segment.

[0039] In order to facilitate the acquisition of the difference between each voltage data segment and the normal situation, the present embodiment presets a reference voltage data segment, which represents the voltage data segment with normal voltage, that is, in the current scenario, the terminal belongs to a complete cycle of voltage sine wave data in a normal voltage state, that is, a complete cycle of voltage sine wave data collected while ensuring that the voltage is normal.

[0040] In an exemplary embodiment, the similarity between any two voltage data segments can be obtained, and the calculation formula is as follows: ; in, represents the DTW distance between the i-th voltage data segment and the j-th voltage data segment; represents the voltage value sequence of the i-th voltage data segment; Represents the voltage value sequence of the jth voltage data segment. It represents the DTW distance between the i-th voltage data segment and the j-th voltage data segment, and represents the similarity measure between the waveforms of the two voltage data segments. The larger the value, the smaller the similarity between the waveforms of the two voltage data segments.

[0041] According to the DTW distance between any two voltage data segments, the voltage data segments are clustered using the K-means algorithm, where K in the K-means algorithm is 2, that is, 2 clusters are obtained. The larger the DTW distance, the less likely it is to be clustered into one category.

[0042] Since abnormal voltage fluctuations are rare, and voltage stability is the manifestation of normal operation of the terminal block, a cluster containing a larger number of voltage data segments is found from the two clusters. This cluster represents the voltage data segment under normal voltage conditions and is the normal cluster. Then, the mean of the voltage data points at each position in the voltage data segment in the normal cluster is calculated, and a voltage data waveform is constructed based on the mean of the voltage data points at each position. This voltage data waveform is used as the reference voltage data segment.

[0043] For any voltage data segment, the greater the difference distance between it and the reference voltage data segment, the more abnormal the voltage data segment is. The difference distance between the voltage data segment and the reference voltage data segment is obtained. The difference distance can be specifically the DTW distance. The larger the DTW distance, the greater the difference between the voltage data segment and the reference voltage data segment. The DTW algorithm is an existing algorithm and will not be described in detail. As other implementation methods, the similarity between the voltage data segment and the reference voltage data segment can also be obtained, such as cosine similarity, Pearson correlation coefficient, etc., and then negative correlation is performed to obtain the difference distance.

[0044] Then, the difference between the voltage change degree of each voltage data point in the voltage data segment and the voltage data point at the corresponding position in the reference voltage data segment is obtained. The voltage change degree is the speed of the voltage change of the voltage data point. In an exemplary embodiment, the voltage change degree is characterized by the slope at the corresponding voltage data point in the voltage curve corresponding to the voltage data segment. The greater the slope, the greater the voltage change degree. Then, the difference between the slope of each voltage data point in the voltage data segment and the voltage data point at the corresponding position in the reference voltage data segment is obtained. The greater the difference in slope, the greater the difference between the voltage data segment and the reference voltage data segment, and the more abnormal the voltage data segment is.

[0045] Step S23: Obtain the trend deviation of the voltage data point according to the difference in the difference distance and the voltage change degree.

[0046] The trend deviation of the voltage data point represents the degree of deviation between the voltage data point and the normal data, that is, the abnormality of the voltage data point. Through the above analysis, it can be seen that the greater the difference distance, the greater the trend deviation of the voltage data point, and the greater the difference in the voltage change degree, the greater the trend deviation of the voltage data point. Therefore, the trend deviation is proportional to the difference in the difference distance and the voltage change degree.

[0047] In an exemplary embodiment, a calculation formula for trend deviation is given as follows: ; in, Indicates the first voltage data in the i-th voltage data segment The trend deviation at each voltage data point; Indicates the difference distance between the i-th voltage data segment in the first voltage data and the reference voltage data segment, representing the change similarity. The larger the value, the smaller the similarity and the greater the deviation from the voltage change in the normal working condition. Indicates the first voltage data in the i-th voltage data segment The slope at each voltage data point; Indicates the reference voltage data segment The slope at each voltage data point.

[0048] Indicates the first voltage data in the i-th voltage data segment The slope at the voltage data point is the same as the slope at the reference voltage data point The slope difference between the slopes at the voltage data points.

[0049] Therefore, the trend deviation represents the consistency of the changing trend. The larger the trend deviation is, the more inconsistent the changing trend is, and the more abnormal the corresponding voltage data point is.

[0050] By the above method, the trend deviation degree at each voltage data point in each voltage data segment in the first voltage data and the trend deviation degree at each voltage data point in each voltage data segment in the second voltage data can be obtained.

[0051] Step S24: obtaining the voltage stability of the voltage data point according to the trend deviation of the voltage data point corresponding to the two ends of the wiring terminal.

[0052] In the actual detection process of the voltage data of the terminal, it is easy to be interfered by the environment and other factors, which is manifested as an abnormal waveform in the collected voltage data. In the above analysis, the greater the trend deviation, the interference is eliminated by analyzing the dynamic changes of the current and voltage on both sides of the terminal to distinguish the impact of interference factors on the voltage. At the same time, in the working process of the terminal, there will be transient overvoltage, which will affect the current and voltage of the terminal. It is necessary to further analyze the current and voltage changes caused by transient overvoltage, so as to make the voltage detection results more accurate.

[0053] When current passes through the terminal, the terminal, as an electrical connection point, usually carries the current flow, and resistance is generated between its material and the contact point, and a voltage difference is formed at both ends. If there is an abnormal voltage phenomenon at the terminal, the voltage at both ends should also have an abnormal change trend. The voltage stability is obtained by the change trend of the voltage on both sides of the terminal. Therefore, according to the trend deviation of the corresponding voltage data points at both ends of the terminal, the voltage stability of the voltage data point is obtained. The voltage stability is inversely proportional to the trend deviation of the corresponding voltage data points at both ends of the terminal.

[0054] In an exemplary embodiment, a calculation formula for voltage stability is given as follows: ; in, Indicates the first voltage data segment Voltage stability at each voltage data point; Indicates the first voltage data segment in the second voltage data The trend deviation at each voltage data point. Express The negative correlation normalization of Represents an exponential function with the natural constant e as the base.

[0055] Indicates the voltage data segment at both ends of the terminal. The overall situation of the trend deviation of the voltage data points. The larger the value, the greater the deviation of the voltage data point in the i-th voltage data segment. The smaller the voltage stability of each voltage data point.

[0056] Step S3: obtaining voltage and current variation regularity characteristics based on the voltage drop of the same voltage data point at both ends of the wiring terminals in the voltage data and the current corresponding to the same voltage data point in the current data.

[0057] Transient overvoltage is a short-term voltage fluctuation caused by rapidly changing current, usually caused by electrical equipment switching, electromagnetic interference and load changes. When the current fluctuates greatly, the terminal is affected and the voltage difference may be aggravated. In order to analyze the specific changes caused by transient overvoltage, it is necessary to obtain voltage drop. Voltage drop refers to the difference in voltage values ​​at the same voltage data point at both ends of the terminal. The difference is specifically the absolute value of the difference.

[0058] In an exemplary embodiment, the voltage drop is obtained using the following calculation formula: ; in, Indicates the first voltage data segment The voltage drop at each voltage data point; Indicates one side of the terminal, that is, the first voltage data segment in the i-th voltage data segment The voltage value of a voltage data point, Indicates the other side of the terminal, that is, the first voltage data segment in the second voltage data The voltage value of each voltage data point; Indicates the first voltage data segment on both sides of the terminal The voltage difference between the voltage data points is called voltage drop.

[0059] In an exemplary embodiment, Figure 5 As shown, a specific process of obtaining the characteristics of voltage and current change rules is given as follows: Step S31: obtaining the ratio of the voltage drop corresponding to each voltage data point to the current value corresponding to the voltage data point as the voltage-current variation relationship of the corresponding voltage data point.

[0060] In an exemplary embodiment, the calculation formula of the voltage-current variation relationship is as follows: ; in, Indicates the first voltage data segment The voltage-current variation relationship of each voltage data point is: Indicates the first current data segment The current value of the current data point in the i-th current data segment is The current data point and the voltage data point in the ith segment The voltage data points correspond to each other and can be understood as the same data point.

[0061] Then, the voltage and current variation relationship can be represented as The relevant characteristics of the resistance of the terminal corresponding to each voltage data point.

[0062] Step S32: Obtain voltage and current variation regularity characteristics based on the voltage and current variation relationship between any two adjacent voltage data points.

[0063] In an exemplary embodiment, Figure 6 As shown, a specific implementation process of step S32 is given as follows, including: Step S321: Calculate the difference between the voltage-current variation relationship between any two adjacent voltage data points. The difference here is the absolute value of the difference between the voltage-current variation relationship between any two adjacent voltage data points.

[0064] Step S322: The difference between the voltage-current variation relationship of any two adjacent voltage data points is merged to obtain the overall difference between the voltage-current variation relationship. The fusion method here is specifically to calculate the average.

[0065] Step S323: Obtain the voltage and current variation regularity characteristics according to the overall difference in the voltage and current variation relationship.

[0066] The overall difference in the relationship between voltage and current changes represents the consistency of the relationship between voltage and current. The greater the overall difference in the relationship between voltage and current changes, the more inconsistent the changes between voltage and current, and the lower the characteristics of the voltage and current change rules. Therefore, the characteristics of the voltage and current change rules are inversely proportional to the overall difference in the relationship between voltage and current changes.

[0067] In an exemplary embodiment, the calculation formula of the voltage and current variation law characteristics is given as follows: ; ; ; in, Indicates the first voltage data segment The voltage drop at each voltage data point is Indicates one side of the terminal, that is, the first voltage data segment in the i-th voltage data segment The voltage value of a voltage data point, Indicates the other side of the terminal, that is, the first voltage data segment in the second voltage data The voltage value of a voltage data point.

[0068] Indicates the first voltage data segment The voltage-current variation relationship of each voltage data point is: Indicates the first current data segment The current of the current data point, where the The current data point and the voltage data point in the ith segment The voltage data points correspond to each other and can be understood as the same data point.

[0069] Indicates the first voltage data segment The relationship between the voltage and current changes of the voltage data point and the voltage data point in the ith voltage data segment The difference between the voltage-current change relationship of the voltage data points. Represents the number of voltage data points in the i-th voltage data segment.

[0070] The average value of the difference between the voltage and current change relationship between any two adjacent voltage data points in the i-th voltage data segment is the overall difference between the voltage and current change relationship. The smaller the overall difference between the voltage and current change relationship, the greater the consistency of the change trend of voltage and current.

[0071] It represents the voltage and current variation characteristics of the ith voltage data segment, that is, the consistency of the voltage and current variation trends.

[0072] Step S4: According to the voltage and current variation law characteristics and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained.

[0073] According to the changing rules of the terminal current and the voltage at both ends, combined with the voltage stability at both ends, the influence of most interference factors can be eliminated. When the corresponding changing rules do not change, the voltage detection result of the terminal is normal; if it changes, there is a problem with the voltage data. Then, according to the characteristics of the voltage and current changing rules and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained.

[0074] In an exemplary embodiment, Figure 7 As shown, a specific process of obtaining voltage abnormality is given as follows, including: Step S41: Obtain the difference between the voltage and current variation law characteristics and the preset reference voltage and current variation law characteristics to obtain the voltage and current variation law characteristics difference.

[0075] A reference voltage and current variation regularity characteristic is preset, and the purpose of the preset reference voltage and current variation regularity characteristic is to compare it with the voltage and current variation regularity characteristic obtained in step 3 to obtain the difference between the two. The greater the difference, the greater the abnormality. The preset reference voltage and current variation regularity characteristic can be characterized as the voltage and current variation regularity characteristic under normal circumstances. Therefore, the preset reference voltage and current variation regularity characteristic can be a pre-set known data. As another embodiment, it can also be the average value of the voltage and current variation regularity characteristics of all voltage data segments, and the average value is used to characterize the overall situation of the voltage and current variation regularity characteristic.

[0076] The difference between the voltage and current variation law characteristic and the preset reference voltage and current variation law characteristic is obtained to obtain the voltage and current variation law characteristic difference. The greater the voltage and current variation law characteristic difference is, the more abnormal the voltage and current variation law characteristic is.

[0077] Step S42: according to the characteristic differences of the voltage and current variation rules and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained.

[0078] Voltage anomaly characterizes voltage anomaly, that is, abnormal situation. Therefore, the greater the difference in voltage and current variation characteristics, the greater the voltage anomaly, and the smaller the voltage stability, the greater the voltage anomaly. Then, voltage anomaly is proportional to the difference in voltage and current variation characteristics, and inversely proportional to voltage stability.

[0079] In an exemplary embodiment, the calculation formula of voltage abnormality is given as follows: ; in, Indicates the first voltage data segment Voltage anomaly of each voltage data point; Indicates the characteristics of the preset reference voltage and current change rules.

[0080] Step S5: according to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the wiring terminal, the transient overvoltage performance degree of each voltage data point is obtained.

[0081] In an exemplary embodiment, Figure 8 As shown, a specific process for obtaining transient overvoltage performance is given as follows, including: Step S51: obtaining the transient overvoltage dynamic change characteristics of each voltage data point according to the voltage extreme difference of the voltage data segment where each voltage data point is located and the voltage change degree of each voltage data point.

[0082] At the moment of transient overvoltage, the voltage drop across the terminals usually increases rapidly, because the instantaneous increase in current causes greater voltage loss through the resistance and contact resistance of the terminals, which is manifested as a spike in the voltage drop of the terminals during the duration of the overvoltage. As the current returns to normal, the voltage drop gradually returns to normal levels. After the transient overvoltage, the voltage drop of the terminals will gradually return to normal levels as the current decays. In the case of transient overvoltage, the current and voltage drop will have a spike phenomenon simultaneously. Through data changes, the dynamic change characteristics of the transient overvoltage of the voltage data are obtained. According to the dynamic change characteristics of the transient overvoltage of the terminal voltage, in the process of detecting the voltage, the transient change is temporary and recoverable, and the detected voltage change is within the normal range. Therefore, according to the dynamic characteristics of the transient overvoltage, the real detection state of the voltage data is obtained.

[0083] The voltage range of the voltage data segment where each voltage data point is located is obtained, and the voltage range is the difference between the maximum voltage value and the minimum voltage value in the corresponding voltage data segment.

[0084] According to the voltage extreme difference of the voltage data segment where each voltage data point is located, and the voltage change degree of each voltage data point, the transient overvoltage dynamic change characteristics of each voltage data point are obtained. The transient overvoltage dynamic change characteristics characterize the degree of change of the transient overvoltage. Therefore, the larger the voltage extreme difference, the larger the transient overvoltage dynamic change characteristics, and the larger the voltage change degree, the larger the transient overvoltage dynamic change characteristics. Therefore, the transient overvoltage dynamic change characteristics are proportional to the voltage extreme difference and the voltage change degree.

[0085] In an exemplary embodiment, a specific calculation formula for the transient overvoltage dynamic change characteristics is given as follows: ; in, Indicates one end of the wiring terminal, that is, the first voltage data segment in the i-th voltage data segment The transient overvoltage dynamic change characteristics of each voltage data point; It represents the difference between the maximum voltage value and the minimum voltage value in the i-th voltage data segment in the first voltage data, that is, the voltage range.

[0086] The larger it is, the more it conforms to the transient overvoltage characteristics of an instantaneous surge. The larger the value is, the larger the value of the first voltage data segment is. The greater the probability that a voltage data point is a spike caused by a transient voltage.

[0087] Step S52: Obtain the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the wiring terminal.

[0088] The difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the terminal block is specifically the absolute value of the difference.

[0089] Step S53: Obtaining the transient overvoltage performance degree according to the difference between the transient overvoltage dynamic change characteristics.

[0090] According to the dynamic change characteristics of the current and voltage of the terminal, if the current and voltage conform to the dynamic change trend caused by the transient overvoltage phenomenon, it means that the voltage data showing abnormal fluctuations is a normal change.

[0091] Then, the smaller the difference between the dynamic change characteristics of transient overvoltage, the more normal the transient overvoltage phenomenon is, and the higher the transient overvoltage manifestation degree is. Therefore, the transient overvoltage manifestation degree is inversely proportional to the difference between the dynamic change characteristics of transient overvoltage.

[0092] In an exemplary embodiment, a specific calculation formula for transient overvoltage performance is given as follows: ; in, Indicates the first voltage data segment Transient overvoltage performance of each voltage data point; Indicates the other end of the wiring terminal, that is, the first voltage data segment in the second voltage data The transient overvoltage dynamic change characteristics of voltage data points.

[0093] Indicates the voltage data segment at both ends of the terminal. The difference in the transient overvoltage dynamic change characteristics of the voltage data points.

[0094] Step S6: Correcting the voltage abnormality according to the transient overvoltage performance to obtain the target voltage abnormality.

[0095] The voltage of the terminal is expressed as abnormally fluctuating data. If a transient overvoltage occurs, the voltage abnormality of the corresponding voltage data point needs to be adjusted to obtain a more accurate voltage detection result. Moreover, the more normal the transient overvoltage situation is, the more it is necessary to eliminate the impact caused by the transient overvoltage.

[0096] In an exemplary embodiment, Fig. 9 As shown, a specific process of obtaining the target voltage abnormality is given as follows, including: Step S61: obtaining a correction coefficient of each voltage data point according to the transient overvoltage performance of each voltage data point, wherein the correction coefficient is inversely proportional to the transient overvoltage performance.

[0097] Step S62: multiplying the correction coefficient of each voltage data point by the voltage anomaly of each voltage data point, and the obtained product is the target voltage anomaly of each voltage data point.

[0098] In an exemplary embodiment, a specific calculation formula for target voltage abnormality is given as follows: ; in, Indicates the first voltage data segment The target voltage anomaly for each voltage data point. is the first voltage data segment in the i-th voltage data segment. Correction factor for each voltage data point.

[0099] By adopting the above process, the target voltage anomaly of each voltage data point in each voltage data segment is obtained. The target voltage anomaly is the voltage detection result with transient overvoltage interference removed.

[0100] Step S7: Perform fault detection on the connection terminal according to the target voltage abnormality of each voltage data point.

[0101] By analyzing the voltage anomalies at the wiring terminals that may be caused by transient overvoltages, short-term voltage spikes or drops are generated, and the corrected voltage anomalies are obtained.

[0102] In an exemplary embodiment, Fig.10 As shown, a specific acquisition process for fault detection of the wiring terminal is given as follows, including: Step S71: comparing the target voltage abnormality of each voltage data point with a preset voltage abnormality threshold; Step S72: If there are a preset number of target voltage anomalies that are greater than or equal to a preset voltage anomaly threshold, it is determined that there is a fault in the connection terminal.

[0103] A voltage abnormality threshold is preset, and the preset voltage abnormality threshold is used to compare with the target voltage abnormality of each voltage data point, wherein the target voltage abnormality greater than the preset voltage abnormality threshold excludes the influence of transient overvoltage, indicating that the actual voltage fluctuation of the corresponding voltage data point exceeds the normal range, the detection result is abnormal, and the wiring terminal may have problems such as failure. The numerical range of the preset voltage abnormality threshold is 0-1, and the specific value is determined by actual judgment needs. In this embodiment, 0.7 is taken as an example.

[0104] Compare the target voltage abnormality of each voltage data point with the preset voltage abnormality threshold. If there are a preset number of target voltage abnormalities greater than or equal to the preset voltage abnormality threshold, it is determined that the terminal is faulty. The preset number is set according to actual needs, and can be 1 or a positive number greater than 1, such as 5. Then, if there are a preset number of target voltage abnormalities greater than or equal to the preset voltage abnormality threshold, it is determined that the terminal is faulty and needs to be repaired immediately to ensure the safe and stable operation of the electrical system. An alarm signal can be output later to remind the staff in time.

[0105] This embodiment also provides a terminal voltage detection device, which includes a unit for executing the above-mentioned terminal voltage detection method. Each unit can be a software unit corresponding to each method step, or a hardware circuit for executing each method step, which is not limited in this embodiment.

[0106] This embodiment also provides a terminal block voltage detection system, including: a memory and a processor; the memory is connected to the processor, and the memory is used to store program instructions; the processor is used to implement the steps in the above-mentioned terminal block voltage detection method embodiment when the program instructions are executed.

[0107] In an exemplary embodiment, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps in the above-mentioned terminal voltage detection method embodiment.

[0108] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0109] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A method for detecting voltage at a terminal, characterized in that: include: Obtain voltage data and current data at both ends of the terminal; According to the voltage data, obtaining the voltage stability of each voltage data point; Obtaining voltage and current variation regularity characteristics according to a voltage drop of a same voltage data point at both ends of the wiring terminals in the voltage data and a current corresponding to the same voltage data point in the current data; According to the voltage and current variation law characteristics and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained; According to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the wiring terminal, the transient overvoltage performance degree of each voltage data point is obtained; Correcting the voltage anomaly according to the transient overvoltage performance to obtain a target voltage anomaly; According to the target voltage abnormality of each voltage data point, fault detection is performed on the connection terminal.

2. A method for detecting voltage at a connection terminal as claimed in claim 1, characterized in that: According to the voltage data, the voltage stability of each voltage data point is obtained, including: Segmenting the voltage data at both ends of the wiring terminal according to the same segmentation rule to obtain a plurality of voltage data segments corresponding to each end of the wiring terminal; Obtaining a difference distance between the voltage data segment and a reference voltage data segment, and obtaining a difference in voltage change degree between each voltage data point in the voltage data segment and a voltage data point at a corresponding position in the reference voltage data segment; According to the difference between the difference distance and the voltage change degree, a trend deviation of the voltage data point is obtained; the trend deviation is proportional to the difference between the difference distance and the voltage change degree; The voltage stability of the voltage data points is obtained according to the trend deviation of the voltage data points corresponding to the two ends of the wiring terminals; the voltage stability is inversely proportional to the trend deviation of the voltage data points corresponding to the two ends of the wiring terminals.

3. A method for detecting voltage at a connection terminal as claimed in claim 2, characterized in that: According to the voltage drop of the same voltage data point at both ends of the wiring terminal in the voltage data, and the current corresponding to the same voltage data point in the current data, the voltage and current variation law characteristics are obtained, including: Obtaining a ratio of a voltage drop corresponding to each voltage data point to a current value corresponding to the voltage data point as a voltage-current variation relationship of the corresponding voltage data point; the voltage drop is a difference in voltage values ​​of the same voltage data point at both ends of the wiring terminal; According to the voltage-current variation relationship between any two adjacent voltage data points, the voltage-current variation regularity characteristics are obtained.

4. A method for detecting voltage at a connection terminal as claimed in claim 3, characterized in that: According to the voltage-current change relationship between any two adjacent voltage data points, the voltage-current change law characteristics are obtained, including: Calculate the difference in the voltage-current variation relationship between any two adjacent voltage data points; The difference between the voltage-current variation relationship of any two adjacent voltage data points is integrated to obtain the overall difference between the voltage-current variation relationship; According to the overall difference of the voltage-current variation relationship, a voltage-current variation law characteristic is obtained, and the voltage-current variation law characteristic is inversely proportional to the overall difference of the voltage-current variation relationship.

5. A method for detecting voltage at a connection terminal as claimed in claim 1, characterized in that: According to the voltage and current variation law characteristics and the voltage stability of each voltage data point, the voltage anomaly of each voltage data point is obtained, including: Obtaining a difference between the voltage and current variation law characteristic and a preset reference voltage and current variation law characteristic to obtain a voltage and current variation law characteristic difference; The voltage anomaly of each voltage data point is obtained according to the characteristic difference of the voltage and current variation law and the voltage stability of each voltage data point; the voltage anomaly is proportional to the characteristic difference of the voltage and current variation law and inversely proportional to the voltage stability.

6. A method for detecting voltage at a connection terminal as claimed in claim 2, characterized in that: According to the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the terminal, the transient overvoltage performance of each voltage data point is obtained, including: According to the voltage extreme difference of the voltage data segment where each voltage data point is located and the voltage change degree of each voltage data point, the transient overvoltage dynamic change characteristics of each voltage data point are obtained; the transient overvoltage dynamic change characteristics are proportional to the voltage extreme difference and the voltage change degree; Obtain the difference between the transient overvoltage dynamic change characteristics of the same voltage data point at both ends of the terminal; According to the difference between the transient overvoltage dynamic change characteristics, a transient overvoltage performance degree is obtained; the transient overvoltage performance degree is inversely proportional to the difference between the transient overvoltage dynamic change characteristics.

7. A method for detecting voltage at a connection terminal as claimed in claim 1, characterized in that: The voltage anomaly is corrected according to the transient overvoltage manifestation to obtain a target voltage anomaly, including: Obtaining a correction coefficient for each voltage data point according to the transient overvoltage performance degree of each voltage data point, wherein the correction coefficient is inversely proportional to the transient overvoltage performance degree; The correction coefficient of each voltage data point is multiplied by the voltage anomaly of each voltage data point, and the obtained product is the target voltage anomaly of each voltage data point.

8. A method for detecting voltage at a connection terminal as claimed in claim 1, characterized in that: According to the target voltage anomaly of each voltage data point, fault detection is performed on the wiring terminal, including: comparing the target voltage abnormality of each voltage data point with a preset voltage abnormality threshold; If there are a preset number of target voltage abnormalities that are greater than or equal to a preset voltage abnormality threshold, it is determined that there is a fault in the connection terminal.

9. A terminal voltage detection device, characterized in that: The terminal voltage detection device comprises a unit for executing the terminal voltage detection method according to any one of claims 1 to 8.

10. A terminal voltage detection system, comprising: Memory and processor; The memory is connected to the processor; The memory is used to store program instructions; The processor is used to implement the terminal voltage detection method according to any one of claims 1 to 8 when the program instructions are executed.

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