A method for testing the stability of terminal block wire connection

Abstract

The present application relates to the technical field of wire connection stability detection, and specifically to a terminal block wire connection stability test method, the method comprising: utilizing the correlation between the current and voltage data of each port wire, and the difference in the stability of the terminal block load between adjacent acquisition moments, to analyze the electrical changes at each acquisition moment; combining the differential value after the temperature sequence and the electrical changes at all acquisition moments to obtain the environmental adaptation at each acquisition moment; using the environmental adaptation at each acquisition moment as an exogenous variable of the ARI MAX algorithm to obtain the predicted result sequence of the current and voltage sequence of each port wire; judging the size relationship between the differential value of the predicted result sequence and a preset abnormal threshold, and predicting the port wire with faults in the terminal block. The present application aims to take into account the influence of ambient temperature on the stability of the terminal block wire connection, which helps to timely discover potential faulty wires and achieve preventive maintenance.

Description

Technical Field

[0001] The present application relates to the technical field of wire connection stability detection, and in particular to a terminal block wire connection stability testing method. Background Art

[0002] With the rapid development of industries such as automobiles, aviation, and communications, the performance requirements for electrical connections are increasing. Terminal blocks are low-cost, multi-purpose connectors for connecting wires. Their stability and reliability directly affect the normal operation and safety of electronic equipment. The significance of wire connection in terminal blocks is to ensure the normal operation and convenience of maintenance of electrical systems. Through reasonable selection and crimping, close contact between wires and terminal blocks can be ensured, reducing resistance and improving current transmission efficiency.

[0003] In practical applications, the stability of the terminal block wire connection is crucial to ensure the reliability and safety of the entire electrical system. The stability and safety of the terminal block wire connection needs to be flexibly adjusted and optimized based on specific circumstances to adapt to the use requirements in different environments. The impact of environmental factors on the stability of wire connections is multi-dimensional. They act on the performance of wires and terminals by changing the physical, chemical and mechanical properties of materials. In the prior art, environmental factors are usually considered to be low-probability events, so their impact on connection stability is ignored. However, rapid changes in temperature may cause changes in material properties, contact resistance or thermal expansion, etc. These factors will have a continuous impact on electrical performance, and their combined impact is far greater than a single event. If the relationship between electrical data and temperature data is ignored, the analysis of the stability of terminal block wire connections may be biased, and then there will be a problem of low accuracy in fault detection and analysis of the terminal block port wires. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a terminal block wire connection stability testing method to solve the existing problems.

[0005] A terminal block wire connection stability test method of the present application adopts the following technical solution:

[0006] An embodiment of the present application provides a method for testing the stability of terminal block wire connection, including a terminal block, a temperature sensor, a current sensor, a voltage sensor, a load, and a wire connected to the load on the terminal block port; all ports on the terminal block are sorted, and all ports are connected to the load through wires and then placed in a constant temperature box; a temperature sensor is installed in the constant temperature box to collect the real-time temperature sequence in the constant temperature box; voltage and current data of the wire of each port of the terminal block are collected through a voltage and current sensor, and the voltage and current sensor is installed on the wire connected to the load at each port of the terminal block; the test of the stability of the terminal block wire connection specifically includes the following steps:

[0007] A1, using the correlation between the current and voltage data of each port wire, observe the stability of the terminal block port load at each acquisition moment;

[0008] A2, analyzing the electrical changes at each collection moment according to the differences in distribution rules and change trends of the stability of the terminal block load between adjacent collection moments obtained in step A1, and the fluctuations between the loads of all ports of the terminal block at the current moment;

[0009] A3, combining the differential value at each acquisition moment after the temperature sequence difference, the differential value at the corresponding acquisition moment after the electrical change conditions at all acquisition moments obtained in step A2 are differentiable, and the electrical change conditions at the corresponding acquisition moment, to obtain the environmental adaptability at each acquisition moment;

[0010] A4, taking the environmental adaptation status at each acquisition moment obtained in step A3 as an exogenous variable of the ARI MAX algorithm, and using the ARI MAX algorithm to obtain a prediction result sequence of the current and voltage sequences of the wires at each port;

[0011] A5, determining the size relationship between the difference value of the prediction result sequence obtained in step A4 and a preset abnormal threshold, and predicting that there is a faulty port conductor on the terminal block.

[0012] Preferably, the constant temperature box changes the temperature through its internal refrigeration compressor and hot air blower.

[0013] Preferably, the method for observing the stability of the terminal block port load at each acquisition moment includes:

[0014] For the current and voltage data of each port conductor, the correlation between the current data and the voltage data at each acquisition moment and all previous acquisition moments is calculated;

[0015] The correlations of all port wires of the terminal block at each acquisition moment are combined into a sequence as the load stability sequence of the port wires of the terminal block at each acquisition moment.

[0016] Preferably, the analyzing of electrical changes at each acquisition moment includes:

[0017] Obtain the difference in distribution rules between load stability sequences at adjacent acquisition moments, recorded as the first difference;

[0018] Obtain the difference in the changing trends between the load stability sequences at adjacent acquisition moments, recorded as the second difference;

[0019] Obtain the fluctuation of the load stability sequence at each acquisition moment, recorded as the third difference;

[0020] The first difference, the second difference and the third difference are integrated to obtain the electrical change at each acquisition moment.

[0021] Preferably, the first difference is the fractal dimension between the load stabilization sequence at each acquisition moment and its previous adjacent acquisition moment.

[0022] Preferably, the second difference is the difference between the slopes of the fitted straight lines after the load stability sequence at each acquisition moment and the previous adjacent acquisition moment are fitted with a straight line.

[0023] Preferably, the third difference is a standard deviation of the load stability sequence at each acquisition moment.

[0024] Preferably, the determining of the environmental adaptability at each acquisition moment includes:

[0025] The temperature series is differentiated and normalized to obtain a temperature difference series;

[0026] The electrical change difference sequence is obtained by differentiating and normalizing the sequence composed of the electrical change conditions at all acquisition moments;

[0027] Calculate the product of the corresponding elements at each acquisition moment in the temperature difference sequence and the electrical change difference sequence as the numerator; use the electrical change at each acquisition moment as the denominator;

[0028] The ratio of the numerator to the denominator is calculated as the environmental adaptation status at each collection moment.

[0029] Preferably, the method for obtaining the prediction result sequence of the current and voltage sequences of the respective port conductors comprises:

[0030] The current and voltage sequences of each port conductor are used as inputs of the ARI MAX algorithm, and the environmental adaptation conditions at each acquisition moment are used as exogenous variables of the ARI MAX algorithm, and the prediction result sequences of the current and voltage sequences of each port conductor are output respectively;

[0031] The prediction result sequence is a number of future prediction values; wherein the exogenous variable of each future prediction value is set to the environmental adaptation condition at the current collection moment.

[0032] Preferably, the method for predicting a faulty port conductor of the terminal block comprises:

[0033] Calculate the difference sequence of the prediction result sequence, and mark the moments of the data points in the difference sequence whose difference values ​​are greater than the preset abnormal threshold as abnormal moments;

[0034] For any port conductor of the terminal block, if there is an abnormal moment in the prediction result sequence of the current and voltage sequence of the port conductor, it is predicted that there is a fault in the conductor at the connection port.

[0035] This application has at least the following beneficial effects:

[0036] The present application implements a terminal block wire connection stability test method. Compared with the prior art that does not consider the influence of ambient temperature on the terminal block wire connection stability, the present application observes the stability of the terminal block port load at each acquisition moment based on the correlation analysis between current and voltage data, which is used to analyze the electrical performance stability problem of the terminal block under temperature fluctuations; the present application analyzes the electrical changes at each acquisition moment by analyzing the differences in the distribution rules and change trends of the stability between adjacent acquisition moments, as well as the fluctuations between the loads of all ports of the terminal block at the current moment, so as to characterize the performance changes of the terminal block at different time points and the performance consistency characteristics between the ports; the present application obtains the environmental adaptability at each acquisition moment by combining the values ​​after the difference of the temperature sequence, the values ​​after the difference of the electrical changes, and the electrical changes, and analyzes the response adaptability and performance stability of the terminal block to temperature changes through differential data in response to the adaptability of the terminal block under different environmental conditions; finally, the environmental adaptability is used as the ARI The exogenous variables of the MAX algorithm make the prediction result sequence of the current and voltage sequence more able to reflect the actual situation. The current and voltage anomaly detection problem of the terminal block under different temperature tests is observed to solve the abnormal current and voltage characteristics under the influence of factors such as material property changes, contact resistance changes or thermal expansion caused by temperature changes. It can more accurately identify the current and voltage anomalies caused by temperature changes, which helps to timely discover potential faulty port wires and achieve preventive maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A flow chart of a terminal block wire connection stability testing method provided in one embodiment of the present application;

[0039] Figure 2 A flow chart of the test steps for the stability of the terminal block wire connection provided by one embodiment of the present application;

[0040] Figure 3 A flowchart of the steps for obtaining electrical changes at each acquisition moment provided for one embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the terminal block wire connection stability test method proposed in the present application, its specific implementation method, structure, features and effects, in combination 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.

[0042] 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 application belongs.

[0043] The specific scheme of a terminal block wire connection stability testing method provided by the present application is described in detail below with reference to the accompanying drawings.

[0044] An embodiment of the present application provides a method for testing the stability of terminal block wire connections.

[0045] Specifically, a terminal block wire connection stability test method is provided as follows. Figure 1 , the method comprises the following steps:

[0046] The first step is to conduct random sampling inspection on the terminal blocks shipped out of the factory and set up a variable temperature environment to collect electrical data of all port wires in the terminal block.

[0047] The produced terminal blocks are sampled and all the ports on the terminal blocks are sorted. All the ports are connected to the loads through wires and placed in a constant temperature box. The constant temperature box undergoes rapid temperature changes through its internal refrigeration compressor and hot air blower. Other embodiments of the present application may also use other devices to control the temperature change, and the temperature change range is controlled to be -20°C to 80°C. A temperature sensor is installed in the constant temperature box to collect the real-time temperature in the constant temperature box; current and voltage sensors are installed on the wires of each port of the terminal block to collect current and voltage data on the wires of the load connected to each port of the terminal block.

[0048] In this embodiment, the temperature in the constant temperature box and the current and voltage data of the load wire connected to each port of the terminal block are uniformly collected at a time interval of 0.5s, and all the collected data are normalized to obtain a temperature sequence and a current sequence and a voltage sequence of the wire at each port of the terminal block.

[0049] The second step is to evaluate the performance stability of the collected electrical data of each port wire of the terminal block under temperature fluctuations, and predict future current and voltage data to identify the stability of the terminal block wire connection affected by temperature, which facilitates the health management of the terminal block wire.

[0050] Temperature change is one of the key environmental factors that affect device performance. In order to ensure that the device maintains stable operation under extreme or changing temperature conditions, the performance evaluation of the wires connecting the load under temperature changes helps to judge the long-term reliability of the equipment to ensure that they can work normally under various environmental conditions.

[0051] Accordingly, a flowchart of the test steps for the stability of the terminal block wire connection according to an embodiment of the present application is shown in the attached figure. Figure 2 As shown, the specific steps include:

[0052] A1, using the correlation between the current and voltage data of each port wire, observe the stability of the terminal block port load at each acquisition moment.

[0053] In order to evaluate the performance of all wires connected to the load under temperature changes, the current data and voltage data of each port load at each acquisition moment and all previous acquisition moments are subjected to correlation analysis. This embodiment uses the Pearson correlation analysis algorithm for analysis. The Pearson correlation analysis algorithm is a well-known technology and will not be described in detail. In other embodiments, the inverse of the DTW distance can also be used for correlation analysis.

[0054] The Pearson correlation analysis algorithm is used to output the Pearson correlation coefficient of each port load of the terminal block at each acquisition moment. The Pearson correlation coefficients of all port loads at each acquisition moment are sorted according to the sorting order of the ports to form a stable load sequence of the terminal block port wires at each acquisition moment.

[0055] It should be understood that when the Pearson correlation coefficient of a port load is larger, it means that the voltage and current data of the wire where the port is located have similar changes, which can be used to reflect the stability of the wire connected to the port load.

[0056] A2, according to the differences in distribution rules and change trends of the stability of the terminal block load between adjacent collection moments obtained in step A1, as well as the fluctuations between the loads of all ports of the terminal block at the current moment, analyze the electrical changes at each collection moment.

[0057] Since at each acquisition moment, different ports of the terminal block may have different load electrical data conditions, but the changes of the terminal block as a whole between adjacent acquisition moments are relatively similar. When there is an abnormality in the port wire, there may be different changes between adjacent acquisition moments. This application analyzes the electrical changes at each acquisition moment by analyzing the differences in distribution rules, change trends, and fluctuations between the load stability sequences of the terminal block port wires at adjacent acquisition moments, and the loads of all ports of the terminal block at the current moment. The flowchart of the steps for obtaining the electrical changes at each acquisition moment is shown in the attached figure. Figure 3 As shown, specifically:

[0058] Obtain the difference in distribution rules between load stability sequences at adjacent acquisition moments, recorded as the first difference; obtain the difference in change trend between load stability sequences at adjacent acquisition moments, recorded as the second difference; obtain the fluctuation of the load stability sequence at each acquisition moment, recorded as the third difference; fuse the first difference, the second difference and the third difference to obtain the electrical change at each acquisition moment.

[0059] It can be understood that fusion can be divided into forward fusion and reverse fusion. This embodiment adopts the forward fusion method. Forward fusion is a fusion method such as addition and multiplication between data. The specific forward fusion method is determined by the implementer according to the actual situation. The application does not impose any special restrictions.

[0060] In one embodiment of the present application, the product of the first difference, the second difference and the third difference is used as the electrical change at each acquisition moment.

[0061] In another embodiment of the present application, the cumulative sum of the first difference, the second difference and the third difference is used as the electrical change at each acquisition moment.

[0062] In other embodiments of the present application, the sum of the first difference and the second difference may be multiplied by the third difference to obtain the electrical change at each acquisition moment.

[0063] In this embodiment, the first difference is the fractal dimension between the load stability sequence at each acquisition moment and its previous adjacent acquisition moment, the second difference is the absolute value of the difference between the slopes of the fitted straight lines after the load stability sequence at each acquisition moment and its previous adjacent acquisition moment is fitted, and the third difference is the standard deviation of the load stability sequence at each acquisition moment.

[0064] Preferably, in other embodiments of the present application, the first difference can also be the KS statistic between the load stability sequence at each collection moment and the previous adjacent collection moment, the second difference can also be the difference between the load stability sequence at each collection moment and the previous adjacent collection moment after linear regression, and the third difference can also be the variance or range of the load stability sequence at each collection moment. The specific first difference, second difference and third difference are set by the implementer.

[0065] Considering that the first acquisition moment has no previous adjacent acquisition moment, the above analysis is not performed on the first acquisition moment, and the analysis starts from the second acquisition moment. Among them, the fractal dimension is the load stability sequence of each acquisition moment and its previous adjacent acquisition moment, which is calculated by the box counting method with a box side length of 1. The box counting method is a well-known technology and will not be described in detail. This embodiment uses the least squares method to fit the load stability sequence. The least squares method is a well-known technology and will not be described in detail.

[0066] It should be understood that the first difference reflects the complexity difference between the load stability sequences of the terminal block's various port wires at adjacent acquisition moments. The larger the first difference, the more significant the change in the overall load stability distribution of the terminal block. The second difference reflects the trend difference between the load stability sequences of the terminal block's various port wires at adjacent acquisition moments over time. The larger the second difference, the more significant the change in the performance of the terminal block's various port wires at the time level, indicating that the terminal block is more sensitive to temperature changes. The third difference represents the performance consistency between the terminal block's various port wires at each acquisition moment. The larger the third difference, the worse the consistency of the performance between the port wires, that is, there may be a large performance difference between the port wires. The first, second and third differences are integrated to comprehensively consider the differences in the consistency of the terminal block's performance over time and between the port wires. The greater the electrical change, the more significant the performance change of the terminal block at the current analysis moment, and the greater the performance difference between the port wires, indicating that the performance stability between the different port wires of the terminal block is poor under temperature changes, that is, there is a large performance inconsistency due to the influence of temperature.

[0067] A3, combining the differential value of each collection moment after the temperature sequence difference, the differential value of the corresponding collection moment after the electrical change conditions of all collection moments obtained in step A2, and the electrical change conditions at the corresponding collection moment, to obtain the environmental adaptability of each collection moment.

[0068] If the electrical changes between all adjacent acquisition moments of the terminal block have certain rules, even if the changes are large, it is a normal phenomenon. If an irregular prominent change suddenly occurs when the overall changes are relatively regular, it is determined that such a prominent change may be an abnormality in the terminal block wire connection. At the same time, the temperature change may have a certain impact on the stability of the terminal block wire connection. Based on this, the present application combines the differential value of each acquisition moment after the temperature sequence difference, the differential value of the corresponding acquisition moment after the electrical changes of all acquisition moments obtained in step A2 are differentiating, and the electrical changes at the corresponding acquisition moment to obtain the environmental adaptation at each acquisition moment, which is specifically:

[0069] Since the above calculation starts from the second acquisition moment, an electrical change factor can be obtained at each acquisition moment after the second acquisition moment. The electrical change factors corresponding to all acquisition moments are arranged in ascending time order, and the electrical change factor of the first acquisition moment is padded with 0 to obtain the electrical change sequence.

[0070] The difference sequences of the temperature sequence and the electrical change sequence are calculated respectively, and the two difference sequences are normalized. The two normalized difference sequences are recorded as the temperature difference sequence and the electrical change difference sequence.

[0071] It should be noted that the normalization method is to divide each element in the sequence by the maximum value of the elements in the sequence. Each element in the normalized sequence represents the ratio of the corresponding change in the original sequence to the maximum change of the entire sequence, reflecting the relative amplitude of the change of each element in the original data sequence.

[0072] Since temperature directly affects the physical and chemical properties of materials, including conductivity, expansion coefficient and material strength, the effect of temperature on the stability of terminal block wire connection is significant. However, temperature is not the only influencing factor. The stability of electrical connections is also affected by the combined effects of environmental factors such as vibration, humidity, pollution and mechanical stress. For example, vibration may cause the connection point to loosen, while humidity may cause corrosion and affect the conductivity. The accumulation of pollutants may change the contact resistance, and mechanical stress may cause material fatigue. These factors may act independently or interact with each other to jointly affect the performance of the terminal block. This embodiment takes temperature as an example to analyze the effect of temperature on the stability of terminal block wire connection. In other embodiments of the present application, the effect of other influencing factors on the stability of terminal block wire connection may also be analyzed.

[0073] First, the product between the corresponding elements of each acquisition moment in the temperature difference sequence and the electrical change difference sequence is calculated as the numerator; the electrical change at each acquisition moment is used as the denominator.

[0074] Then, the ratio of the numerator to the denominator is calculated as the environmental adaptation situation corresponding to each collection moment.

[0075] It should be understood that the numerator represents the direct impact of temperature changes on the stability of terminal block wire connection. The larger the value, the greater the difference between the performance of the terminal block and the temperature change when the temperature changes, the less affected by the temperature change, and the greater the environmental adaptability. The denominator reflects the performance changes of the terminal block at different time points and the performance consistency between the port wires, indicating that the performance changes of the terminal block are more sensitive to temperature changes, the less adaptable to temperature, and the less environmental adaptability. Environmental adaptability indicates the adaptability of the terminal block performance changes to temperature changes after considering the influence of other environmental factors. The greater the environmental adaptability, the less sensitive the performance changes of the terminal block are to temperature changes, that is, the better the performance stability of the terminal block is, and the less affected by temperature changes.

[0076] A4, taking the environmental adaptation status at each acquisition moment obtained in step A3 as an exogenous variable of the ARI MAX algorithm, and using the ARI MAX algorithm to obtain a prediction result sequence of the current and voltage sequences of the conductors of each port.

[0077] In order to analyze the influence of thermal shock on the connection stability of terminal block wires, the normalized current and voltage series of each terminal block interface were used as input, and the ARI MAX autoregressive integrated moving average model and exogenous variables were used to predict the current and voltage of all port wires.

[0078] In the hot and cold shock test, temperature changes will affect the current and voltage data of the terminal block wire connection. Temperature changes may cause changes in material properties, contact resistance or thermal expansion, etc. These factors may affect the electrical performance. In order to ensure that the test results reflect the performance of the terminal block in the actual use environment, the environmental adaptability factor at each acquisition moment is introduced as an exogenous variable into the ARI MAX algorithm to consider the impact of temperature changes on electrical performance. Among them, the method of introducing exogenous variables is specifically to use the environmental adaptability factor at each acquisition moment as the exogenous variable corresponding to each acquisition moment in the input sequence. The ARI MAX algorithm is a well-known technology and will not be described in detail.

[0079] It should be understood that by introducing exogenous variables, the stability and reliability of the terminal block in long-term operation can be more accurately evaluated, which helps to evaluate the adaptability of the equipment to different environmental conditions, thereby more accurately identifying potential failures or performance degradation problems caused by temperature changes.

[0080] According to the ARI MAX algorithm with exogenous variables added, the current and voltage sequences of each port wire of the terminal block are predicted respectively, and the prediction result sequences of the current and voltage sequences of each port wire are output respectively. The prediction result sequence is composed of several future prediction values. The value in this embodiment is 10, and the implementer can set it according to the actual situation. At the same time, the exogenous variable data of several future prediction values ​​is set as the environmental adaptability factor at the current collection time, which can also be set according to the actual situation in other embodiments of this application.

[0081] A5, determining the size relationship between the difference value of the prediction result sequence obtained in step A4 and a preset abnormal threshold, and predicting that there is a faulty port conductor on the terminal block.

[0082] This embodiment analyzes the predicted result sequence to find out the faulty port wires on the terminal block, specifically:

[0083] The difference sequence of the prediction result sequence is calculated. In this embodiment, the abnormal threshold is set to 0.4, and the moments of the data points in the difference sequence whose difference values ​​are greater than the abnormal threshold are marked as abnormal moments.

[0084] For any port wire of the terminal block, if there is an abnormal moment in the predicted result sequence of the current and voltage sequence of the port wire, it is considered that the connection of the wire at the port is unstable and there is a fault in the wire connected to the port, reminding the staff to manage the health of the terminal block wires and maintain the wires that may have faults in advance to avoid more serious problems.

[0085] The various embodiments in the present application 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.

[0086] It should be noted that, unless otherwise specified and limited, terms such as "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, an element defined by the sentence "including one..." does not exclude the existence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items.

[0087] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not invented by the present application.

[0088] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A method for testing the stability of terminal block wire connection, characterized in that: The method comprises a terminal block, a temperature sensor, a current sensor, a voltage sensor, a load, and a wire connected to the load at a terminal block port; all ports on the terminal block are sorted, and all ports are connected to the load through wires and then placed in a constant temperature box; a temperature sensor is installed in the constant temperature box to collect a real-time temperature sequence in the constant temperature box; voltage and current data of the wire of each port of the terminal block are collected through a voltage and current sensor, and the voltage and current sensor is installed on the wire connected to the load at each port of the terminal block; The test of the terminal block wire connection stability specifically includes the following steps: A1, using the correlation between the current and voltage data of each port wire, observe the stability of the terminal block port load at each acquisition moment; A2, analyzing the electrical changes at each collection moment according to the differences in distribution rules and change trends of the stability of the terminal block load between adjacent collection moments obtained in step A1, and the fluctuations between the loads of all ports of the terminal block at the current moment; A3, combining the differential value at each acquisition moment after the temperature sequence difference, the differential value at the corresponding acquisition moment after the electrical change conditions at all acquisition moments obtained in step A2 are differentiable, and the electrical change conditions at the corresponding acquisition moment, to obtain the environmental adaptability at each acquisition moment; A4, taking the environmental adaptation status at each acquisition moment obtained in step A3 as an exogenous variable of the ARIMAX algorithm, and using the ARIMAX algorithm to obtain a prediction result sequence of the current and voltage sequences of the wires at each port; A5, determining the size relationship between the difference value of the prediction result sequence obtained in step A4 and a preset abnormal threshold, and predicting that there is a faulty port conductor on the terminal block.

2. A terminal block wire connection stability testing method as claimed in claim 1, characterized in that: The constant temperature box changes the temperature through its internal refrigeration compressor and hot air blower.

3. A terminal block wire connection stability testing method as claimed in claim 1, characterized in that: The method for observing the stability of the terminal block port load at each acquisition moment includes: For the current and voltage data of each port conductor, the correlation between the current data and the voltage data at each acquisition moment and all previous acquisition moments is calculated; The correlations of all port wires of the terminal block at each acquisition moment are combined into a sequence as the load stability sequence of the port wires of the terminal block at each acquisition moment.

4. A terminal block wire connection stability testing method as claimed in claim 3, characterized in that: The analysis of electrical changes at each acquisition moment includes: Obtain the difference in distribution rules between load stability sequences at adjacent acquisition moments, recorded as the first difference; Obtain the difference in the changing trends between the load stability sequences at adjacent acquisition moments, recorded as the second difference; Obtain the fluctuation of the load stability sequence at each acquisition moment, recorded as the third difference; The first difference, the second difference and the third difference are integrated to obtain the electrical change at each acquisition moment.

5. A terminal block wire connection stability testing method as claimed in claim 4, characterized in that: The first difference is the fractal dimension of the load stability sequence between each acquisition moment and its previous adjacent acquisition moment.

6. A terminal block wire connection stability testing method as claimed in claim 4, characterized in that: The second difference is the difference between the slopes of the fitted straight lines after the load stability sequence at each acquisition moment and the previous adjacent acquisition moment are fitted with a straight line.

7. A terminal block wire connection stability testing method as claimed in claim 4, characterized in that: The third difference is the standard deviation of the load stability sequence at each acquisition moment.

8. A terminal block wire connection stability testing method as claimed in claim 4, characterized in that: The environmental adaptation condition at each acquisition moment is obtained, including: The temperature series is differentiated and normalized to obtain a temperature difference series; The electrical change difference sequence is obtained by differentiating and normalizing the sequence composed of the electrical change conditions at all acquisition moments; Calculate the product of the corresponding elements at each acquisition moment in the temperature difference sequence and the electrical change difference sequence as the numerator; use the electrical change at each acquisition moment as the denominator; The ratio of the numerator to the denominator is calculated as the environmental adaptation status at each collection moment.

9. A terminal block wire connection stability testing method as claimed in claim 8, characterized in that: The method for obtaining the prediction result sequence of the current and voltage sequence of each port conductor comprises: The current and voltage sequences of each port conductor are used as inputs of the ARIMAX algorithm, and the environmental adaptation conditions at each acquisition moment are used as exogenous variables of the ARIMAX algorithm, and the prediction result sequences of the current and voltage sequences of each port conductor are output respectively; The prediction result sequence is a number of future prediction values; wherein the exogenous variable of each future prediction value is set to the environmental adaptation condition at the current collection moment.

10. A terminal block wire connection stability testing method as claimed in claim 9, characterized in that: The method for predicting a faulty port conductor of the terminal block includes: Calculate the difference sequence of the prediction result sequence, and mark the moments of the data points in the difference sequence whose difference values ​​are greater than the preset abnormal threshold as abnormal moments; For any port conductor of the terminal block, if there is an abnormal moment in the prediction result sequence of the current and voltage sequence of the port conductor, it is predicted that there is a fault in the conductor at the connection port.

Images