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CN-122017687-A - Sensor-based integrated terminal connection state detection method and system

CN122017687ACN 122017687 ACN122017687 ACN 122017687ACN-122017687-A

Abstract

The application relates to the technical field of detection of an integrated terminal connection state, in particular to a detection method and a detection system of an integrated terminal connection state based on a sensor. The method comprises the steps of obtaining instantaneous voltage information and instantaneous current information, calculating transient impedance parameters when current impact events exist in the instantaneous current information, extracting transient characteristics from the transient impedance parameters, establishing a normal operation reference range in a normal connection state, obtaining the transient characteristics, comparing the transient characteristics with the normal operation reference range to obtain deviation conditions or change trends, judging whether early mechanical loosening risk criteria are met according to the deviation conditions or the change trends, judging that early mechanical loosening risk exists when the early mechanical loosening risk criteria are met, and outputting early warning information. The method solves the problems that in the prior art, the detection method of the integrated terminal connection state is difficult to identify early mechanical loosening risks in real time and sensitively, and early and transient heat signals are difficult to capture effectively under the background of strong electromagnetic interference and mechanical vibration, so that failure early warning is not timely.

Inventors

  • Liu Shaoxiao

Assignees

  • 东莞市鸿泰精密电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260310

Claims (10)

  1. 1. A method for detecting a connection state of an integrated terminal based on a sensor, the method comprising: Synchronously acquiring instantaneous voltage information at two ends of a connecting point of an integrated terminal and instantaneous current information flowing through the integrated terminal; When the instantaneous current information meets a preset impact criterion and represents that a current impact event exists, in a time window corresponding to the current impact event, enabling the instantaneous voltage information to correspond to the instantaneous current information holding time, and calculating the instantaneous impedance parameter of the connection point under the impact action based on the instantaneous voltage information and the instantaneous current information; extracting transient characteristics for representing microscopic contact states of the connection points from the transient impedance parameters; When the integrated terminal is in a normal connection state, establishing a normal operation reference range of the transient characteristic; continuously acquiring the transient characteristic in the operation process of the integrated terminal, and comparing the transient characteristic with the normal operation reference range to acquire the deviation condition or the change trend of the transient characteristic; Judging whether the deviation condition or the change trend meets a preset early mechanical looseness risk criterion according to the deviation condition or the change trend, wherein the early mechanical looseness risk criterion comprises that the transient characteristic exceeds the normal operation reference range and/or the change trend continuously meets a preset deviation condition within a preset observation window; when the deviation condition or the change trend meets the early mechanical loosening risk criterion, judging that the early mechanical loosening risk exists at the connecting point of the integrated terminal, and outputting early warning information.
  2. 2. The sensor-based integrated terminal connection state detection method of claim 1, wherein extracting transient features from the transient impedance parameters that characterize the microcontact state of the connection point comprises: Performing high-pass filtering processing on the transient impedance parameters to isolate low-frequency components in the transient impedance parameters; performing spectrum analysis on the transient impedance parameters after high-pass filtering to obtain energy characteristics of a preset high-frequency band; Selecting sampling points, in which the instantaneous current information meets preset effective current conditions, in a time window corresponding to the current impact event, constructing a voltage-current dynamic relationship track based on the instantaneous voltage information and the instantaneous current information corresponding to the sampling point time, constructing an impedance-current dynamic relationship track based on the instantaneous impedance parameter and the instantaneous current information, and calculating geometric parameters of the voltage-current dynamic relationship track and/or the impedance-current dynamic relationship track; performing a differential operation on a rising edge of the transient impedance parameter to detect if there is an impedance spike and/or oscillation of duration within a preset minimum time; Dynamically learning and updating the energy characteristics, the geometric parameters and transient characteristics of detection results of impedance spikes and/or oscillations under normal operation conditions to extract a reference standard; And extracting the deviation degree and/or the change mode of the reference datum relative to the transient characteristic according to the current energy characteristic, the geometric parameter and the detection result of the impedance peak and/or the oscillation to form the transient characteristic.
  3. 3. The sensor-based integrated terminal connection state detection method according to claim 1, wherein continuously acquiring the transient characteristic and comparing the transient characteristic with the normal operation reference range to obtain a deviation condition or a change trend of the transient characteristic, comprises: Synchronously acquiring environmental vibration information and power grid fluctuation information related to the integral terminal connection part while continuously acquiring the transient characteristic; Noise separation processing is carried out on the transient characteristics, and electromagnetic interference components indicated by the power grid fluctuation information are separated from the transient characteristics so as to obtain separated transient characteristics; performing feature association analysis based on the separated transient features and the environmental vibration information to obtain association indexes representing the correlation between the separated transient features and the environmental vibration information; Establishing an environmental interference mode reference standard of an environmental interference mode according to historical association indexes when the integrated terminal is in a normal connection state; Comparing the associated index with the environmental interference mode reference standard to identify environmental interference components conforming to the environmental interference mode, and performing inhibition, rejection and/or compensation processing on the separated transient characteristics to obtain transient characteristics after interference removal; and comparing the transient characteristics after interference removal with the normal operation reference range to obtain deviation situations or change trends of the transient characteristics.
  4. 4. The sensor-based integrated terminal connection state detection method according to claim 1, wherein when the deviation condition or the change trend satisfies the early mechanical loosening risk criterion, after determining that there is an early mechanical loosening risk at the connection point of the integrated terminal, further comprising: Obtaining key grade information, load level information and potential fault influence grade information corresponding to connection points of a plurality of integrated terminals, wherein the key grade information is used for representing the importance degree of the connection points in a power supply loop or a production line, the load level information is used for representing the load intensity of the connection points in a preset statistical time window, and the potential fault influence grade information is used for representing the influence degree of the failure of the connection points on power supply continuity or production; Calculating a risk priority value of a connection point of each integrated terminal according to the criticality grade information, the load level information and the potential fault influence grade information; generating an early warning sequencing result based on the risk priority value, so that a plurality of pieces of early warning information are arranged according to a preset sequencing rule of the risk priority value; Determining the risk level corresponding to each early warning information according to the corresponding relation between the risk priority value and a preset grading rule; outputting early warning information, namely outputting a plurality of early warning information according to the early warning sequencing result, and executing a corresponding preset notification strategy according to the risk level so as to send out grading early warning information.
  5. 5. The sensor-based integrated terminal connection state detection method according to claim 4, wherein acquiring the load level information includes: Calculating the electric energy dissipation value of the current impact event based on the instantaneous voltage information and the instantaneous current information in a time window corresponding to the current impact event; accumulating the electric energy dissipation values of a plurality of current impact events in a preset statistical time window to obtain accumulated electric energy dissipation quantity; and taking the accumulated electric energy consumption as the load level information.
  6. 6. The sensor-based integrated terminal connection state detection method according to claim 4, wherein acquiring the criticality class information and the potential fault impact class information comprises: for each connection point of the integrated terminal, acquiring the current production task priority of equipment associated with the connection point of the integrated terminal in real time; Determining a process flow key node identifier of the associated equipment according to the current production task priority, and determining the criticality grade information based on the current production task priority and the process flow key node identifier according to a preset criticality evaluation rule; Pre-constructing a security event class library, wherein the security event class library comprises a corresponding relation between a connection point attribute and a security event class, the connection point attribute comprises a device class of equipment associated with the connection point and/or a power supply loop identifier to which the connection point belongs, and the security event class corresponding to the connection point is determined in the security event class library based on the connection point attribute; And determining estimated production loss data based on the safety event level and according to a preset loss evaluation rule, and determining the potential fault influence level information based on the safety event level and the estimated production loss data according to a preset influence evaluation rule.
  7. 7. The sensor-based integrated terminal connection state detection method according to claim 4, wherein determining a risk level corresponding to each of the early warning information according to a correspondence between the risk priority value and a preset classification rule comprises: acquiring historical distribution characteristics of the risk priority values corresponding to the connection points of the integrated terminals; Setting initial risk level boundary points of the risk level according to the history distribution characteristics and in combination with a preset risk management strategy so as to form the preset grading rule; Comparing the new risk priority value generated in the operation process with the initial risk level boundary point to determine a risk level corresponding to the new risk priority value, and recording the switching times of the risk level in a preset observation window; When the new risk priority value continuously reaches the preset times in the preset boundary tolerance interval and the switching times reach the preset switching threshold value, determining that a fuzzy area exists in the boundary point of the initial risk level; Aiming at the fuzzy area, collecting a risk priority value sample falling into the fuzzy area and operation and maintenance treatment result information corresponding to the risk priority value sample, wherein the operation and maintenance treatment result information comprises actual fault result information and/or operation and maintenance personnel feedback information; based on the risk priority value sample and the operation and maintenance treatment result information, adjusting the initial risk level boundary point to obtain an updated risk level boundary point; Calculating a boundary definition index according to the updated risk level boundary points, and continuously iteratively updating the risk level boundary points when the boundary definition index does not meet the preset boundary definition requirement until the boundary definition requirement is met; and based on the risk level boundary points meeting the preset boundary definition requirement, carrying out interval judgment on the risk priority value so as to determine the risk level corresponding to each early warning information.
  8. 8. The sensor-based integrated terminal connection state detection method according to claim 7, wherein obtaining the historical distribution characteristics of the risk priority values corresponding to the connection points of the integrated terminals comprises: acquiring production batch information, environment temperature information, equipment maintenance records and equipment version information related to equipment associated with the connection point of the integrated terminal in real time; segmenting historical data of the risk priority value according to the production batch information; according to the environmental temperature information, dividing the segmented historical data into temperature intervals; according to the equipment maintenance record, carrying out maintenance period marking on the historical data after the temperature interval division; Classifying the device version of the historical data marked by the maintenance period according to the device version information to obtain a plurality of classified historical data subsets; Calculating the mean value, the variance and the skewness of each historical data subset, and constructing a dynamic distribution feature set of the risk priority value according to the mean value, the variance and the skewness corresponding to each historical data subset; when the production batch information, the environment temperature information, the equipment maintenance record or the equipment version information change, triggering the updating of the dynamic distribution feature set to obtain the updated historical distribution feature.
  9. 9. The sensor-based integrated terminal connection state detection method according to claim 7, wherein setting an initial risk level boundary point of the risk level according to the history distribution feature in combination with a preset risk management policy comprises: acquiring production batch information, environment temperature information, equipment maintenance records and equipment version information related to equipment associated with the connection point of the integrated terminal in real time; Based on production batch information, environment temperature information, equipment maintenance records and equipment version information, carrying out multidimensional grouping on the historical data of the risk priority value to obtain a plurality of grouped historical data subsets; Calculating the mean value, the variance and the skewness of each historical data subset, and constructing a dynamic distribution feature set of the risk priority value under different working conditions according to the mean value, the variance and the skewness corresponding to each historical data subset; based on the dynamic distribution feature set, performing distribution change point detection and/or cluster analysis on the risk priority value to obtain change points and/or natural cluster centers of the risk priority value distribution; adjusting the change points and/or the natural clustering centers by combining the preset risk management strategy to determine initial risk level boundary points of the risk level; When the production batch information, the environment temperature information, the equipment maintenance record or the equipment version information change, the reconstruction of the dynamic distribution feature set is triggered, and the resetting of the initial risk level boundary point is triggered.
  10. 10. A sensor-based integrated terminal connection status detection system, the system comprising: the information acquisition module is used for synchronously acquiring the instantaneous voltage information at two ends of a connecting point of the integrated terminal and the instantaneous current information flowing through the integrated terminal; The impedance calculation module is used for enabling the instantaneous voltage information to correspond to the instantaneous current information holding time in a time window corresponding to the current impact event when the instantaneous current information meets a preset impact criterion to represent that the current impact event exists, and calculating the instantaneous impedance parameter of the connecting point under the impact action based on the instantaneous voltage information and the instantaneous current information; The characteristic extraction module is used for extracting transient characteristics used for representing the microcosmic contact state of the connecting point from the transient impedance parameters; The reference range establishing module is used for establishing a normal operation reference range of the transient characteristic when the integrated terminal is in a normal connection state; The change tracking module is used for continuously acquiring the transient characteristic in the operation process of the integrated terminal and comparing the transient characteristic with the normal operation reference range so as to acquire the deviation condition or the change trend of the transient characteristic; The judging module is used for judging whether the deviation condition or the change trend meets a preset early mechanical loosening risk criterion according to the deviation condition or the change trend, wherein the early mechanical loosening risk criterion comprises that the transient characteristic exceeds the normal operation reference range and/or the change trend continuously meets a preset deviation condition within a preset observation window; And the early warning module is used for judging that the early mechanical loosening risk exists at the connecting point of the integrated terminal when the deviation condition or the change trend meets the early mechanical loosening risk criterion and outputting early warning information.

Description

Sensor-based integrated terminal connection state detection method and system Technical Field The application relates to the technical field of detection of an integrated terminal connection state, in particular to a detection method and a detection system of an integrated terminal connection state based on a sensor. Background In the field of power systems and industrial automation, integrated terminals are important components of equipment connections, the contact robustness of which directly influences the equipment safety. Currently, checking the connection status of terminals often relies on manual or post-equipment downtime analysis, which makes it difficult to monitor electrical parameters (such as contact resistance and current distribution) in real time, resulting in potential risks such as poor contact, overheating or loosening that cannot be timely detected. In a large industrial equipment environment, the integrated terminals are not only subjected to transient current shocks caused by the load, but also to cope with mechanical vibrations. The combined action of current impact and vibration can accelerate loosening of terminal connection, but the thermal characteristic of early loosening is shown as short and weak temperature pulse, and the traditional temperature monitoring method is difficult to capture the transient signal, so that a missing report or delay alarm is not found until the loosening condition is serious. In addition, the power distribution cabinet works in a complex environment, and strong mechanical vibration and current impact superposition function makes the loosening process of terminal connection more difficult to predict. Impact forces with two different frequencies and amplitudes act on the fastening bolt to quicken the loosening speed and bring challenges to detection. In view of the above, there is a need in the art for improvements. Disclosure of Invention The application discloses a sensor-based integrated terminal connection state detection method and system, and aims to solve the problems that in the prior art, the integrated terminal connection state detection method is difficult to identify early mechanical loosening risks in real time and sensitively, and early and transient heat signals are difficult to capture effectively under the background of strong electromagnetic interference and mechanical vibration, so that failure early warning is not timely. The technical scheme of the application is as follows: in a first aspect, the application discloses a method for detecting an integrated terminal connection state based on a sensor, which comprises the following steps: Synchronously acquiring instantaneous voltage information at two ends of a connecting point of the integrated terminal and instantaneous current information flowing through the integrated terminal; When the instantaneous current information meets a preset impact criterion and represents that a current impact event exists, in a time window corresponding to the current impact event, enabling the instantaneous voltage information to correspond to the holding time of the instantaneous current information, and calculating the instantaneous impedance parameter of the connection point under the impact action based on the instantaneous voltage information and the instantaneous current information; Extracting transient characteristics used for representing microcosmic contact states of the connecting points from transient impedance parameters; When the integrated terminal is in a normal connection state, establishing a normal operation reference range of transient characteristics; Continuously acquiring transient characteristics in the operation process of the integrated terminal, and comparing the transient characteristics with a normal operation reference range to acquire deviation conditions or change trends of the transient characteristics; Judging whether the deviation situation or the change trend meets a preset early mechanical loosening risk criterion according to the deviation situation or the change trend, wherein the early mechanical loosening risk criterion comprises that the transient characteristic of the deviation situation exceeds a normal operation reference range and/or the deviation situation continuously meets a preset deviation condition in a preset observation window; When the deviation condition or the change trend meets the early mechanical loosening risk criterion, judging that the early mechanical loosening risk exists at the connecting point of the integrated terminal, and outputting early warning information. In a second aspect, the present application also discloses a sensor-based integrated terminal connection status detection system, which includes: the information acquisition module is used for synchronously acquiring the instantaneous voltage information at two ends of the connecting point of the integrated terminal and the instantaneous current information flowing through the