CN-121978410-A - Method, system, equipment and medium for monitoring contact resistance of quick connection device

CN121978410ACN 121978410 ACN121978410 ACN 121978410ACN-121978410-A

Abstract

The invention discloses a method, a system, equipment and a medium for monitoring contact resistance of a quick connecting device, which relate to the technical field of information and comprise the steps of calculating deviation percentages of currents of all contact pairs and current average values of all contact pairs to obtain current distribution deviation, comparing occurrence frequency and amplitude deviation degree of the current deviation, identifying suspected contact pairs of degradation, collecting spring piece clamping pressure of suspected contact pairs of degradation to obtain a high-risk contact pair list, monitoring contact pair contact temperature of high-risk contact, confirming that contact pairs with temperature rise exceeding a normal temperature difference range are degradation contact pairs, obtaining comprehensive degradation indexes by combining long-term current fluctuation amplitude, determining monitoring priority according to the comprehensive degradation indexes, and obtaining a monitoring weight distribution list. And reallocating the monitoring resources according to the monitoring weight allocation table to obtain an optimized monitoring configuration scheme. According to the invention, by introducing the deviation percentage, the deviation occurrence frequency and the long-term fluctuation characteristic, the accurate judgment of the deterioration of the contact state from instantaneous abnormality to trend is realized.

Inventors

Qian Daixiang
WANG KANGJIAN
WANG CHAO
HE XIU
Li Bangchao
WANG KANGLIN
WU HUITING

Assignees

海南电网有限责任公司定安供电局

Dates

Publication Date: 20260505
Application Date: 20251217

Claims (10)

1. A method for monitoring contact resistance of a quick connection device is characterized by comprising the following steps, Collecting real-time current values of all spring contact pairs and contact resistances of the spring pieces through independent current sensors, and calculating deviation percentages of current of all contact pairs and current average values of all contact pairs to obtain current distribution deviation; counting the current distribution deviation of each contact pair in a target time period to obtain the long-term current fluctuation amplitude and the fluctuation duration, comparing the occurrence frequency and the amplitude deviation of the current deviation, and identifying the suspected contact pair; Collecting the spring piece clamping pressure of the suspected contact pair, identifying the contact pair with the clamping pressure lower than a pressure threshold, marking the contact pair as a high-risk contact pair, and obtaining a high-risk contact pair list; monitoring the contact temperature of the high risk, calculating a temperature rise value with an environmental reference temperature, and confirming that a contact pair with the temperature rise exceeding a normal temperature difference range is a degradation contact pair; Multiplying the current bearing ratio of the deteriorated contact pair by the current distribution deviation to obtain a deteriorated duty ratio coefficient, combining the long-term current fluctuation amplitude to obtain a comprehensive deterioration index, determining the monitoring priority according to the comprehensive deterioration index, and adjusting the monitoring weight of each contact pair to obtain a monitoring weight distribution table; according to the monitoring weight distribution table, reallocating monitoring resources, evaluating the cluster distribution of the degradation contact pair current and the temperature, determining the duty ratio of degradation signals, and updating the monitoring frequency and the early warning limit by combining the fluctuation duration to obtain an optimized monitoring configuration scheme; and collecting instantaneous current peak values and leaf spring deformation quantities of each contact pair again, calculating actual current sharing proportion, and measuring contact resistance of each contact pair according to the optimized monitoring configuration scheme to obtain a contact resistance state evaluation report of the quick connection device.
2. A method for monitoring contact resistance of a quick connect device as defined in claim 1, wherein said deriving a deviation of current distribution comprises, A current sensor array is deployed in a busbar connection area, each spring piece contact pair is provided with an independent sensor unit, instantaneous current values flowing through each spring piece are captured, constant test current is applied, terminal voltage is measured, and a contact resistance value is calculated; Calculating the average value of all contact pairs at each sampling moment as a reference current, and calculating the deviation percentage of the actual current of each contact pair and the reference current; and carrying out standard deviation analysis on the deviation percentage sequence, counting the occurrence frequency and duration of the abnormal deviation state, and constructing a current distribution deviation evaluation matrix to obtain current distribution deviation.
3. A method of monitoring contact resistance of a quick connect device as set forth in claim 2, wherein identifying suspected contact pairs comprises, Extracting deviation percentage time sequence data of each contact pair in a target time period from current distribution deviation data, calculating the difference between the maximum value and the minimum value as long-term current fluctuation amplitude, and counting the longest interval continuously exceeding a threshold value to obtain fluctuation duration; comparing the current frequency deviation degree with deviation data in a historical monitoring period, and calculating the current frequency deviation degree and the current amplitude deviation degree; multiplying the frequency deviation degree by the amplitude deviation degree, multiplying the frequency deviation degree by the fluctuation duration to obtain a degradation risk index, sorting according to the degradation risk index, and identifying the contact pair exceeding the risk threshold as a degradation suspected contact pair.
4. A method for monitoring contact resistance of a quick connect device according to claim 3, wherein said obtaining a list of high risk contact pairs comprises, Converting deformation resistance change into voltage output through a Wheatstone bridge based on a pressure sensor of the degradation suspected contact to the root of the spring piece, and converting a clamping pressure value according to a pressure and voltage calibration curve; And comparing the clamping pressure value with a pressure threshold value, marking the contact pair with the clamping pressure smaller than the threshold value as a high risk contact pair, summarizing the number, the pressure value and the deficiency degree, and obtaining a high risk contact pair list.
5. The method for monitoring contact resistance of a quick connect device according to claim 4, wherein said determining means of said degraded contact pair comprises, For the identified high-risk contact pair, measuring the surface temperature based on an infrared temperature sensor, and simultaneously collecting the temperature of the contact pair with normal pressure on the same busbar as the environment reference temperature; calculating the difference value between the measured temperature of each high-risk contact pair and the environment reference temperature to obtain the temperature rise value of each contact point; and comparing the temperature rise value with a preset normal working temperature difference range, and if the temperature rise value of a certain high-risk contact pair exceeds the upper limit value of the normal working temperature difference range, confirming the contact pair as a degradation contact pair.
6. A method for monitoring contact resistance of a quick connect device as defined in claim 5, wherein said obtaining a monitoring weight distribution table comprises, Calculating the ratio of the actual current to the total current of the deteriorated contact pair to obtain a current bearing ratio; Multiplying the current bearing ratio by the deviation percentage to obtain a degradation duty ratio coefficient, and multiplying the degradation duty ratio coefficient by the long-term current fluctuation amplitude to obtain a comprehensive degradation index; And determining a priority value according to the descending order of the comprehensive degradation indexes, adjusting the initial weight and normalizing to obtain a monitoring weight distribution table.
7. A method for monitoring contact resistance of a quick connect device as defined in claim 6, wherein the optimized monitoring configuration comprises, According to the monitoring weight distribution table, sampling frequency and bandwidth are redistributed according to weight, and a two-dimensional data point set is constructed by collecting real-time current and temperature values of the degradation contact pair; dividing the sensor into three clusters by adopting a clustering algorithm, calculating the duty ratio of a degradation signal, and adjusting the sampling frequency and the temperature early warning limit by combining the duration of historical fluctuation; Summarizing the updated monitoring frequency, the early warning limit and the resource quota to obtain an optimized monitoring configuration scheme.
8. A contact resistance monitoring system of a quick connecting device, which is applied to the method for monitoring the contact resistance of the quick connecting device according to any one of claims 1-7, and is characterized by comprising a preliminary judging module, a degradation determining module, a scheme making module and an implementation module; the preliminary discrimination module collects real-time current values of all spring contact pairs and contact resistances of the spring pieces through independent current sensors, calculates deviation percentages of current of all contact pairs and current average values of all contact pairs, obtains current distribution deviation, counts current distribution deviation of all contact pairs in a target time period, obtains long-term current fluctuation amplitude and fluctuation duration, compares occurrence frequency and amplitude deviation of current deviation, and identifies suspected contact pairs of degradation; The degradation determining module is used for collecting the spring piece clamping pressure of the suspected contact pair, identifying the contact pair with the clamping pressure lower than the pressure threshold, marking the contact pair as a high-risk contact pair, obtaining a high-risk contact pair list, monitoring the contact pair contact temperature, calculating the temperature rise value of the contact pair contact temperature and the environment reference temperature, and confirming that the contact pair with the temperature rise exceeding the normal temperature difference range is a degraded contact pair; The scheme making module multiplies the current bearing ratio of the deteriorated contact pair and the current distribution deviation to obtain a deteriorated duty ratio coefficient, combines the long-term current fluctuation range to obtain a comprehensive deteriorated index, determines the monitoring priority according to the comprehensive deteriorated index, adjusts the monitoring weight of each contact pair to obtain a monitoring weight distribution table, redistributes the monitoring resources according to the monitoring weight distribution table, evaluates the current and temperature cluster distribution of the deteriorated contact pair, determines the deteriorated signal duty ratio, and combines the fluctuation duration to update the monitoring frequency and the early warning limit to obtain an optimized monitoring configuration scheme; And the implementation module acquires instantaneous current peak values and spring leaf deformation quantities of all contact pairs again, calculates actual current sharing proportion, and measures contact resistance of all contact pairs according to the optimized monitoring configuration scheme to obtain a contact resistance state evaluation report of the quick connection device.
9. A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that the processor, when executing said computer program, carries out the steps of a method for monitoring the contact resistance of a quick connection device according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of a method for monitoring the contact resistance of a quick connection device according to any one of claims 1 to 7.

Description

Method, system, equipment and medium for monitoring contact resistance of quick connection device Technical Field The invention relates to the technical field of information, in particular to a method, a system, equipment and a medium for monitoring contact resistance of a quick connecting device. Background In the field of power equipment, a quick connecting device of a prefabricated low-voltage power generation vehicle is an important link for guaranteeing the stability and safety of power supply, and the monitoring of contact resistance of the quick connecting device is directly related to the reliability of equipment operation and the prevention of sudden faults. Research in this area has considerable value in reducing the risk of power interruption and in improving emergency power supply capacity, particularly in high load or emergency situations where the performance of the connection device is critical. However, currently in contact resistance monitoring, a common problem is that it is difficult to accurately capture subtle changes in local connection points. Many methods, while capable of measuring the overall resistance, tend to ignore complex interactions between multiple contact points, resulting in inadequate identification of certain critical issues. This limitation is not merely from the rough nature of the monitoring means, but because the dynamic relationship between the contact points is not fully considered, making hidden risks difficult to discover in time. A further technical difficulty is that when a plurality of contact points are connected in parallel, the current distribution is uneven. When a plurality of contact points share a current, each point should theoretically bear a part of the load, but if a certain contact point wears due to long-term use, the resistance value thereof gradually increases. At this point, the current will naturally tend to flow to other contact points where the resistance is small, resulting in a substantial reduction in the current load at the wear point, even close to zero. This maldistribution phenomenon makes it difficult for the monitoring system to detect this potential problem by masking the abnormal signal at the wear point by the low resistance of the other normal contact points in the overall resistance measurement. In particular, in the actual operation of the quick connection device of the generator car, it is assumed that a plurality of spring pieces are connected with the busbar, one of the spring pieces is in poor contact due to repeated clamping, the resistance value of the spring piece is obviously increased, but the current almost flows to other spring pieces, the overall resistance change is very little, and the hidden danger can not be recognized by the monitoring system. This partial degradation is masked by the global data, not only increasing the risk of failure, but also possibly causing local overheating and even failure of the connection at high loads. Therefore, how to accurately identify the local degradation signal covered by uneven current distribution under the condition that a plurality of contact points are connected in parallel becomes a key problem for improving the monitoring precision of the contact resistance of the quick connecting device of the power generation vehicle. Disclosure of Invention In view of the above-mentioned problems, the present invention provides a method, a system, a device and a medium for monitoring contact resistance of a quick connection device. Therefore, the problem to be solved by the present invention is how to accurately identify a local degradation signal masked by uneven current distribution in the case where a plurality of contact points are connected in parallel. The invention provides a method for monitoring the contact resistance of a quick connecting device, which comprises the following steps of collecting real-time current values of all spring contact pairs and the contact resistance of a spring piece through independent current sensors, and calculating the deviation percentage of current of all contact pairs and the average value of current of all contact pairs to obtain current distribution deviation; counting the current distribution deviation of each contact pair in a target time period to obtain a long-term current fluctuation amplitude and fluctuation duration, comparing the occurrence frequency and amplitude deviation of the current deviation, identifying a degraded suspected contact pair, collecting the leaf spring clamping pressure of the degraded suspected contact pair, identifying the contact pair with the clamping pressure lower than a pressure threshold, marking the contact pair as a high-risk contact pair list to obtain a high-risk contact pair list, monitoring the temperature of the high-risk contact pair contact point, calculating the temperature rise value of the contact pair with the environment reference temperature, confirming the contact pair with the temperatu