CN117825841A - A shielding quality detection system for copper core control cables - Google Patents
A shielding quality detection system for copper core control cables Download PDFInfo
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- CN117825841A CN117825841A CN202311819630.7A CN202311819630A CN117825841A CN 117825841 A CN117825841 A CN 117825841A CN 202311819630 A CN202311819630 A CN 202311819630A CN 117825841 A CN117825841 A CN 117825841A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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Abstract
本发明提供了一种铜芯控制电缆的屏蔽质量检测系统，包括取样模块、检测信号收发模块、脉冲信号收发模块、图像获取模块和故障分析模块；所述取样模块用于获取待检测的铜芯控制电缆；所述检测信号收发模块用于检测电缆的屏蔽层是否出现故障；所述脉冲信号收发模块用于测量电缆的屏蔽质量指标,所述屏蔽质量指标用于评价铜芯控制电缆的屏蔽质量；所述图像获取模块用于获取电缆的屏蔽层出现故障的位置的图像；所述故障分析模块用于分析屏蔽层故障与屏蔽质量指标的关系。本发明通过采用先检测再计算的方式，有利于将屏蔽质量指标划分为故障电缆和无故障电缆两部分，有利于提高指标的准确度。
The present invention provides a shielding quality detection system for a copper core control cable, comprising a sampling module, a detection signal transceiver module, a pulse signal transceiver module, an image acquisition module and a fault analysis module; the sampling module is used to obtain a copper core control cable to be detected; the detection signal transceiver module is used to detect whether the shielding layer of the cable is faulty; the pulse signal transceiver module is used to measure the shielding quality index of the cable, and the shielding quality index is used to evaluate the shielding quality of the copper core control cable; the image acquisition module is used to obtain an image of the position where the shielding layer of the cable is faulty; the fault analysis module is used to analyze the relationship between the shielding layer fault and the shielding quality index. The present invention is conducive to dividing the shielding quality index into two parts, a faulty cable and a fault-free cable, by adopting a method of first detecting and then calculating, which is conducive to improving the accuracy of the index.
Description
Technical Field
The invention relates to the field of cable detection, in particular to a shielding quality detection system of a copper core control cable.
Background
With the rapid development of information technology and the increasing demand of modern society for high-speed and high-bandwidth communication, copper core control cables play a vital role as an important communication medium in the fields of network communication and data transmission. The copper core control cable is used for transmitting telecommunication, internet and local area network data, and is mainly applied to electric appliances, meters, electronic equipment and the like, and the performance of the copper core control cable is directly related to the stability of communication quality and network performance. However, the cable is subject to various external disturbances and damages during use, and thus a reliable shielding quality detection system is required to ensure its proper operation.
The method for detecting the shielding effect of the multi-core cable assembly based on the probe method disclosed in the prior art of CN110412371A comprises the following steps: 1) Configuring a test system according to the principle of a probe method; 2) Before the test starts, the test equipment is electrified and preheated to reach a stable working state, and a test system is calibrated to ensure that the measurement deviation does not exceed an acceptable range; 3) Setting the frequency and the level of a signal source, injecting signals into the core wire of the multi-core cable assembly and achieving a stable working state; 4) Clamping a current probe on a multi-core cable assembly to be tested; 5) The bandwidth and test time of the receiver are set, and the maximum value is scanned and selected in the applicable frequency range.
Another typical cable shielding test system and test method disclosed in the prior art as CN105116262a includes a test sleeve, a signal generator and a signal receiver, where one end of the test sleeve is provided with a first closed tube, the other end of the test sleeve is provided with a second closed tube, and both the first closed tube and the second closed tube are fixedly connected with the test sleeve.
In view of the system and method for detecting and protecting cable shielding faults disclosed in the prior art of CN112798903a, in a double-shielded cable fault detection method, a power supply is loaded between a ground wire and a monitoring wire at the other end of a double-shielded cable to be detected, and the ground wire or the monitoring wire connected with the cathode of a diode is connected with the anode of the power supply; and then measuring the current of a monitoring line or a grounding wire at the other end of the double-shielded cable to be detected, quickly obtaining the short circuit condition of the grounding wire and the monitoring line according to the resistance obtained by dividing the power supply voltage and the detection current and the short circuit set threshold value, then adopting reverse loading current, obtaining the loop resistance of the monitoring line and the grounding wire according to the loading voltage value on the monitoring line and the grounding wire and the voltage value at the two ends of the diode, and judging whether the monitoring line and the grounding wire of the double-shielded cable to be detected have broken line faults or not.
At present, the shielding quality detection mode of the copper core control cable in the field is single, whether the cable has faults or not can not be detected while the shielding quality is measured, and shielding quality indexes can not be adjusted according to whether the cable has faults or not.
Disclosure of Invention
The invention aims to provide a shielding quality detection system of a copper core control cable, aiming at the defects existing at present.
In order to overcome the defects in the prior art, the invention adopts the following technical scheme:
the shielding quality detection system of the copper core control cable comprises a sampling module, a detection signal receiving and transmitting module, a pulse signal receiving and transmitting module, an image acquisition module and a fault analysis module; the sampling module is used for acquiring a copper core control cable to be detected; the detection signal receiving and transmitting module is used for detecting whether a shielding layer of the copper core control cable to be detected fails or not; the pulse signal receiving and transmitting module is used for calculating the shielding quality index of the cable according to the detection result of the detection signal receiving and transmitting module, and the fault analysis module is used for analyzing the relation between the shielding layer fault and the shielding quality index according to the detection result of the detection signal receiving and transmitting module and the shielding quality index; when the detection signal receiving and transmitting module detects that a fault occurs, the image acquisition module acquires an image of a position where a shielding layer of the copper core control cable to be detected has the fault;
the pulse signal receiving and transmitting module measures the tentative shielding quality index of the fault-free cable by the following steps:
=20*;
wherein the method comprises the steps ofIs a tentative shielding quality index of the fault-free cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the second pulse signal received by the pulse signal receiving unit;
the pulse signal receiving and transmitting module measures tentative shielding quality indexes of the fault cable by the following steps:
=;
wherein,is a tentative shielding quality index of the faulty cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Is the signal amplitude of the third pulse signal received by the pulse signal receiving unit.
Further, the detection signal receiving and transmitting module comprises a detection signal sending unit, a detection signal coupling unit, a detection signal receiving unit, a current detection unit and a fault judging unit; the detection signal transmitting unit is used for transmitting a detection signal; the detection signal coupling unit is used for coupling the detection signal transmitting unit to a shielding layer of a cable; the detection signal receiving unit is used for receiving a detection signal passing through the cable; the current detection unit is used for detecting the current of a detection signal passing through the cable; the fault judging unit is used for judging whether the cable has faults or not according to the detection result of the current detecting unit.
Further, the pulse signal receiving and transmitting module comprises a pulse signal sending unit, a pulse signal adjusting unit, a pulse signal coupling unit, a pulse signal receiving unit and a calculating unit; the pulse signal transmitting unit is used for transmitting pulse signals; the pulse signal adjusting unit is used for adjusting the frequency of the pulse signal sent by the pulse signal sending unit; the pulse signal coupling unit is used for coupling the pulse signal transmitting unit to a core wire of a cable; the pulse signal receiving unit is used for receiving pulse signals; the calculating unit is used for calculating the fault position of the shielding layer and the shielding quality index of the cable.
Further, the image acquisition module comprises a cutting unit, an image shooting unit and an image recognition unit; the cutting unit is used for cutting the cable fault position according to the calculation result of the calculation unit; the image shooting unit is used for shooting the shielding layer exposed out of the cable cut by the cutting unit; the image recognition unit is used for recognizing shielding layer defects in the photographed image of the image photographing unit.
Furthermore, the working flow of the shielding quality detection system of the copper core control cable is as follows:
s1, a sampling unit acquires a cable which needs shielding quality detection;
s2, detecting whether a shielding layer of the cable obtained by the sampling unit fails or not by the detection signal receiving and transmitting module, and if not, executing S3; otherwise, executing S4;
s3, the pulse signal receiving and transmitting module calculates the shielding quality index of the fault-free cable, and the process is finished;
s4, the pulse signal receiving and transmitting module calculates the shielding quality index of the fault cable and the position of the fault point;
s5, an image acquisition module acquires an image of a position where a shielding layer of the cable fails;
s6, the fault analysis module analyzes the relation between the fault of the shielding layer and the shielding quality index.
Further, the detecting signal transceiver module detecting whether the shielding layer of the cable acquired by the sampling unit fails or not includes the following steps:
s21, a detection signal coupling unit couples the detection signal transmitting unit to a shielding layer of the cable;
s22, the detection signal transmitting unit transmits a detection signal according to the set current, and the detection signal propagates through the cable;
s23, a detection signal receiving unit receives a detection signal obtained after the cable is transmitted;
s24, the fault judging unit judges whether the current value of the detection signal transmitted by the cable is smaller than a set threshold value, if yes, the cable is faulty, and if not, the cable is not faulty.
Further, in S3, the pulse signal transceiver module measures a shielding quality index of the fault-free cable, and includes the following steps:
s31, a pulse signal coupling unit couples the pulse signal transmitting unit to a core wire of the cable;
s32, the pulse signal transmitting unit transmits a pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through a cable;
s33, the calculation unit calculates a tentative shielding quality index of the fault-free cable through the following steps:
=;
wherein,is a tentative shielding quality index of the fault-free cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the second pulse signal received by the pulse signal receiving unit;
s34, changing the frequency of the first pulse signal sent by the pulse signal sending unit, returning to S31, repeating 10 times, and taking the average value of the temporary shielding quality indexes of the fault-free cable obtained by 10 times of calculation as the shielding quality index of the fault-free cable.
Further, in S4, the pulse signal transceiver module measures the shielding quality index of the faulty cable and the location of the faulty point, and includes the following steps:
s41, a pulse signal coupling unit couples the pulse signal transmitting unit to a core wire of the cable;
s42, the pulse signal transmitting unit transmits a pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through a cable;
s43, the calculation unit calculates the tentative shielding quality index of the fault cable according to the signals received by the pulse signal receiving unit through the following formula:
=;
wherein,is a tentative shielding quality index of the faulty cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the third pulse signal received by the pulse signal receiving unit;
s44, according to the following formula, according to the position of the fault point:
D=0.5*t*speed；
wherein D is the distance between the fault point and the pulse signal transmitting unit, t is the time from the transmission of the pulse signal to the reception of the reflected signal, and the time is measured by the pulse signal receiving unit; speed is the wave speed, which is determined by the frequency of the first pulse signal sent by the pulse signal sending unit;
s45, changing the frequency of the first pulse signal sent by the pulse signal sending unit, returning to S41, repeating 10 times, and taking the average value of the temporary shielding quality indexes of the fault cable obtained by 10 times of calculation as the shielding quality index of the fault cable.
The beneficial effects obtained by the invention are as follows: 1. by adopting a mode of detecting and calculating firstly, detecting whether a shielding layer of the cable has faults or not firstly, selecting different shielding quality index measurement modes according to whether the faults occur or not, and dividing the shielding quality index measurement modes into a fault cable and a non-fault cable according to shielding quality indexes, thereby being beneficial to improving the accuracy of judging whether the cable has faults or not;
2. the image acquisition module is used for acquiring the image of the fault position, so that the fault condition of the shielding layer of the cable can be judged, and the influence condition of the defect size of the shielding layer on the shielding quality of the cable can be analyzed;
3. the shielding quality index of the cable and the position of the fault point are measured by using the pulse signal, the operation is simple and quick, the data accuracy is high, the frequency of the pulse signal can be changed at any time so as to carry out multiple measurements, the operation burden of staff is reduced, and the accuracy of the index is improved.
Drawings
The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate like parts in the different views.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
Fig. 3 is a flowchart of the detection signal transceiver module of the present invention for detecting whether the shielding layer of the cable has a fault.
Fig. 4 is a flowchart of the pulse signal transceiver module of the present invention for measuring the shielding quality index of a fault-free cable.
Fig. 5 is a flowchart illustrating the operation of the second embodiment of the present invention.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
Embodiment one: according to fig. 1, 2, 3 and 4, the present embodiment provides a shielding quality detection system of a copper core control cable, which includes a sampling module, a detection signal transceiver module, a pulse signal transceiver module, an image acquisition module and a fault analysis module; the sampling module is used for acquiring a copper core control cable to be detected; the detection signal receiving and transmitting module is used for detecting whether a shielding layer of the copper core control cable to be detected fails or not; the pulse signal receiving and transmitting module is used for calculating the shielding quality index of the cable according to the detection result of the detection signal receiving and transmitting module, and the fault analysis module is used for analyzing the relation between the shielding layer fault and the shielding quality index according to the detection result of the detection signal receiving and transmitting module and the shielding quality index; when the detection signal receiving and transmitting module detects that a fault occurs, the image acquisition module acquires an image of a position where a shielding layer of the copper core control cable to be detected has the fault;
the pulse signal receiving and transmitting module measures the tentative shielding quality index of the fault-free cable by the following steps:
=20*;
wherein the method comprises the steps ofIs a tentative shielding quality index of the fault-free cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the second pulse signal received by the pulse signal receiving unit;
the pulse signal receiving and transmitting module measures tentative shielding quality indexes of the fault cable by the following steps:
=;
wherein,is a tentative shielding quality index of the faulty cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Is the signal amplitude of the third pulse signal received by the pulse signal receiving unit.
The first pulse signal is a pulse signal sent by the pulse signal sending unit, the second pulse signal is a pulse signal received by the pulse signal receiving unit after the cable has no fault, and the third pulse signal is a pulse signal received by the pulse signal receiving unit after the cable has the fault.
Specifically, the smaller the provisional shielding quality index is, the better the shielding performance of the cable is.
Specifically, the fault analysis module fits the relation between the fault of the shielding layer and the shielding quality index by adopting different models, judges the fitting results of the different models by using the accuracy index, and selects one model with the highest accuracy index, so that the relation between the fault of the shielding layer and the shielding quality index is represented by using the model.
Further, the detection signal receiving and transmitting module comprises a detection signal sending unit, a detection signal coupling unit, a detection signal receiving unit, a current detection unit and a fault judging unit; the detection signal transmitting unit is used for transmitting a detection signal; the detection signal coupling unit is used for coupling the detection signal transmitting unit to a shielding layer of a cable; the detection signal receiving unit is used for receiving a detection signal passing through the cable; the current detection unit is used for detecting the current of a detection signal passing through the cable; the fault judging unit is used for judging whether the cable has faults or not according to the detection result of the current detecting unit.
Specifically, if the current of the detection signal after passing through the cable is smaller than the set threshold value, it can be determined that the shielding layer of the cable has a fault.
Further, the pulse signal receiving and transmitting module comprises a pulse signal sending unit, a pulse signal adjusting unit, a pulse signal coupling unit, a pulse signal receiving unit and a calculating unit; the pulse signal transmitting unit is used for transmitting pulse signals; the pulse signal adjusting unit is used for adjusting the frequency of the pulse signal (namely, the first pulse signal) sent by the pulse signal sending unit, and the pulse signal coupling unit is used for coupling the pulse signal sending unit to a core wire of a cable; the pulse signal receiving unit is used for receiving pulse signals (namely a second pulse signal and a third pulse signal); the calculating unit is used for calculating the fault position of the shielding layer and the shielding quality index of the cable, and a plurality of groups of different pulse signals can be obtained through pulse signals with different frequencies, so that a plurality of groups of shielding quality indexes are obtained to obtain more objective index parameters.
Further, the image acquisition module comprises a cutting unit, an image shooting unit and an image recognition unit; the cutting unit is used for cutting the cable fault position according to the calculation result of the calculation unit; the image shooting unit is used for shooting the shielding layer exposed out of the cable cut by the cutting unit; the image recognition unit is used for recognizing shielding layer defects in the photographed image of the image photographing unit.
Specifically, the image recognition unit obtains the boundary of the defect of the shielding layer through an edge detection algorithm, and the area size of the defect can be obtained by calculating the number of the pixels of the defect in the pixel image of the shielding layer.
The image acquisition module is used for acquiring the image of the fault position, so that the fault condition of the shielding layer of the cable can be judged, and the influence condition of the defect size of the shielding layer on the shielding quality of the cable can be analyzed.
Furthermore, the working flow of the shielding quality detection system of the copper core control cable is as follows:
s1, a sampling unit acquires a cable which needs shielding quality detection;
s2, detecting whether a shielding layer of the cable obtained by the sampling unit fails or not by the detection signal receiving and transmitting module, and if not, executing S3; otherwise, executing S4;
s3, the pulse signal receiving and transmitting module calculates the shielding quality index of the fault-free cable, and the process is finished;
s4, the pulse signal receiving and transmitting module calculates the shielding quality index of the fault cable and the position of the fault point;
s5, an image acquisition module acquires an image of a position where a shielding layer of the cable fails;
s6, the fault analysis module analyzes the relation between the fault of the shielding layer and the shielding quality index.
Further, the detecting signal transceiver module detecting whether the shielding layer of the cable acquired by the sampling unit fails or not includes the following steps:
s21, a detection signal coupling unit couples the detection signal transmitting unit to a shielding layer of the cable;
s22, the detection signal transmitting unit transmits a detection signal according to the set current, and the detection signal propagates through the cable;
s23, a detection signal receiving unit receives a detection signal propagated through a cable;
s24, the fault judging unit judges whether the current value of the detection signal transmitted by the cable is smaller than a set threshold value, if yes, the cable is faulty, and if not, the cable is not faulty.
By adopting the mode of detecting before calculating, whether the shielding layer of the cable has faults or not is detected, and then different shielding quality index measurement modes are selected according to whether the faults occur or not, and the shielding quality index is divided into a fault cable and a fault-free cable according to the shielding quality index, so that the accuracy of judging whether the cable has faults or not is improved.
Further, in S3, the pulse signal transceiver module measures a shielding quality index of the fault-free cable, and includes the following steps:
s31, a pulse signal coupling unit couples the pulse signal transmitting unit to a core wire of the cable;
s32, the pulse signal transmitting unit transmits a pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through a cable;
s33, the calculation unit calculates a tentative shielding quality index of the fault-free cable through the following steps:
=；
wherein,is a tentative shielding quality index of the fault-free cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the second pulse signal received by the pulse signal receiving unit;
s34, changing the frequency of the first pulse signal sent by the pulse signal sending unit, returning to S31, repeating 10 times, and taking the average value of the temporary shielding quality indexes of the fault-free cable obtained by 10 times of calculation as the shielding quality index of the fault-free cable.
Further, in S4, the pulse signal transceiver module measures the shielding quality index of the faulty cable and the location of the faulty point, and includes the following steps:
s41, a pulse signal coupling unit couples the pulse signal transmitting unit to a core wire of the cable;
s42, the pulse signal transmitting unit transmits a pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through a cable;
specifically, when a pulse propagates in a cable, the pulse is partially reflected due to the change of the wave impedance of the cable at the place where the shielding fault is encountered, so that the original pulse signal is converted into a partial reflection signal and an attenuation signal, and the place where the shielding is disconnected can be positioned by collecting the pulse signal and the reflection signal;
specifically, the part of the pulse signal receiving unit for receiving the reflected signal is positioned on the same side of the cable as the pulse signal transmitting unit, and the part of the pulse signal receiving unit for receiving the attenuated pulse signal is positioned on the opposite side of the cable from the pulse signal transmitting unit;
s43, the calculation unit calculates the tentative shielding quality index of the fault cable according to the signals received by the pulse signal receiving unit through the following formula:
=;
wherein,is a tentative shielding quality index of the faulty cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the third pulse signal received by the pulse signal receiving unit;
s44, according to the following formula, according to the position of the fault point:
D=0.5*t*speed；
wherein D is the distance between the fault point and the pulse signal transmitting unit, t is the time from the transmission of the pulse signal to the reception of the reflected signal, and the time is measured by the pulse signal receiving unit; speed is the wave speed, which is determined by the frequency of the first pulse signal sent by the pulse signal sending unit;
s45, changing the frequency of the first pulse signal sent by the pulse signal sending unit, returning to S41, repeating 10 times, and taking the average value of the temporary shielding quality indexes of the fault cable obtained by 10 times of calculation as the shielding quality index of the fault cable.
The shielding quality index of the cable and the position of the fault point are measured by using the pulse signal, the operation is simple and quick, the data accuracy is high, the frequency of the pulse signal can be changed at any time so as to carry out multiple measurements, the operation burden of staff is reduced, and the accuracy of the index is improved.
Specifically, by comparing the shielding quality index of the faulty cable and the non-faulty cable with the first threshold, the shielding quality of the cable is excellent if the shielding quality index is smaller than the first threshold, the shielding quality of the cable is generally higher if the shielding quality index is larger than the first threshold but smaller than the second threshold, and the shielding quality of the cable is unqualified if the shielding quality index is larger than the second threshold. It is worth noting that the first threshold is smaller than the second threshold, and the first threshold and the second threshold are set by those skilled in the art with reference to industry specifications and actual customer requirements.
Embodiment two: this embodiment should be understood to include all the features of any one of the foregoing embodiments and be further improved on the basis thereof, according to fig. 5, and in that the analysis of the relationship between the shield layer fault and the shield quality index by the fault analysis module includes the steps of:
s61, acquiring the range (B, C) of the calculation results of the shielding quality indexes of different cables under the non-fault condition in all the cables which are subjected to detection;
s62, acquiring the total defect area of the shielding layers of different cables in the fault condition in all the cables to be detected]And a set of shielding quality indicators of the cable corresponding thereto]N is the total number of failed cables;
s63, fitting the x and the y by adopting 4 different models to obtain a linear relation y=of the x and the y(x) Polynomial relation y= = ->(x) The hyperbolic function (one of which) relation y = =>(x) Exponential curve relation y= =>（x）；
Specifically, the linear relation may be y=* The polynomial relation may be y = -x>*+*x+The hyperbolic function relation may be y = = ->The exponential curve relation may be y = =>*The method comprises the steps of carrying out a first treatment on the surface of the Wherein e is a natural constant and is a natural constant,is a coefficient of a relationship;
s64, generating an accuracy index of each model according to the following formula, and selecting a model with the maximum accuracy index as a relation between the shielding layer fault and the shielding quality index:
；
wherein A is an accuracy index, m is the total number of cables without faults,input +.>Corresponding output, ++>For inputting 0 in current modelCorresponding output, ++>And e is a natural constant, and is the mean value of shielding quality indexes of different cables under the non-fault condition.
Specifically, the greater the accuracy index, the higher the accuracy of the model.
The beneficial effects of this embodiment are: by adopting different models to fit the relation between the shielding layer fault and the shielding quality index and judging the accuracy of the fitting result of each model through the accuracy index, the model with the highest fitting degree is favorably screened out, and through the model, workers can know the relation between the shielding layer fault area and the shielding quality, thereby being beneficial to further improving the cable by the workers.
The foregoing disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by applying the description of the present invention and the accompanying drawings are included in the scope of the present invention, and in addition, elements in the present invention can be updated as the technology develops.
Claims (8)
1. The shielding quality detection system of the copper core control cable is characterized by comprising a sampling module, a detection signal receiving and transmitting module, a pulse signal receiving and transmitting module, an image acquisition module and a fault analysis module; the sampling module is used for acquiring a copper core control cable to be detected; the detection signal receiving and transmitting module is used for detecting whether a shielding layer of the copper core control cable to be detected fails or not; the pulse signal receiving and transmitting module is used for calculating the shielding quality index of the cable according to the detection result of the detection signal receiving and transmitting module, and the fault analysis module is used for analyzing the relation between the shielding layer fault and the shielding quality index according to the detection result of the detection signal receiving and transmitting module and the shielding quality index; when the detection signal receiving and transmitting module detects that a fault occurs, the image acquisition module acquires an image of a position where a shielding layer of the copper core control cable to be detected has the fault;
the pulse signal receiving and transmitting module measures the tentative shielding quality index of the fault-free cable by the following steps:
=20*;
wherein the method comprises the steps ofIs a tentative shielding quality index of the fault-free cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the second pulse signal received by the pulse signal receiving unit;
the pulse signal receiving and transmitting module measures tentative shielding quality indexes of the fault cable by the following steps:
=;
wherein,is a tentative shielding quality index of the faulty cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Is the signal amplitude of the third pulse signal received by the pulse signal receiving unit.
2. The shielding quality detection system of a copper core control cable according to claim 1, wherein the detection signal transceiver module comprises a detection signal transmitting unit, a detection signal coupling unit, a detection signal receiving unit, a current detecting unit and a fault judging unit; the detection signal transmitting unit is used for transmitting a detection signal; the detection signal coupling unit is used for coupling the detection signal transmitting unit to a shielding layer of a cable; the detection signal receiving unit is used for receiving a detection signal passing through the cable; the current detection unit is used for detecting the current of the detection signal received by the detection signal receiving unit; the fault judging unit is used for judging whether the cable has faults or not according to the detection result of the current detecting unit.
3. The shielding quality detection system of the copper core control cable according to claim 2, wherein the pulse signal transceiving module comprises a pulse signal transmitting unit, a pulse signal adjusting unit, a pulse signal coupling unit, a pulse signal receiving unit and a calculating unit; the pulse signal transmitting unit is used for transmitting pulse signals; the pulse signal adjusting unit is used for adjusting the frequency of the pulse signal sent by the pulse signal sending unit; the pulse signal coupling unit is used for coupling the pulse signal transmitting unit to a core wire of a cable; the pulse signal receiving unit is used for receiving pulse signals; the calculating unit is used for calculating the fault position of the shielding layer and the shielding quality index of the cable.
4. A shielding quality detection system of a copper core control cable according to claim 3, wherein the image acquisition module comprises a cutting unit, an image capturing unit and an image recognition unit; the cutting unit is used for cutting the cable fault position according to the calculation result of the calculation unit; the image shooting unit is used for shooting the shielding layer exposed out of the cable cut by the cutting unit; the image recognition unit is used for recognizing shielding layer defects in the photographed image of the image photographing unit.
5. The shielding quality detection system of a copper core control cable of claim 4, wherein the shielding quality detection system workflow of the copper core control cable is as follows:
s1, a sampling unit acquires a cable which needs shielding quality detection;
s2, detecting whether a shielding layer of the cable obtained by the sampling unit fails or not by the detection signal receiving and transmitting module, and if not, executing S3; otherwise, executing S4;
s3, the pulse signal receiving and transmitting module calculates the shielding quality index of the fault-free cable, and the process is finished;
s4, the pulse signal receiving and transmitting module calculates the shielding quality index of the fault cable and the position of the fault point;
s5, an image acquisition module acquires an image of a position where a shielding layer of the cable fails;
s6, the fault analysis module analyzes the relation between the fault of the shielding layer and the shielding quality index.
6. The shielding quality detection system of a copper core control cable according to claim 5, wherein the detection signal transceiver module detects whether the shielding layer of the cable obtained by the sampling unit fails, comprising the steps of:
s21, a detection signal coupling unit couples the detection signal transmitting unit to a shielding layer of the cable;
s22, the detection signal transmitting unit transmits a detection signal according to the set current, and the detection signal propagates through the cable;
s23, a detection signal receiving unit receives a detection signal obtained after the cable is transmitted;
s24, the fault judging unit judges whether the current value of the detection signal transmitted by the cable is smaller than a set threshold value, if yes, the cable is faulty, and if not, the cable is not faulty.
7. The shielding quality detection system of a copper core control cable according to claim 6, wherein in S3, the pulse signal transceiver module measures a shielding quality index of a fault-free cable comprising the steps of:
s31, a pulse signal coupling unit couples the pulse signal transmitting unit to a core wire of the cable;
s32, the pulse signal transmitting unit transmits a pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through a cable;
s33, the calculation unit calculates a tentative shielding quality index of the fault-free cable through the following steps:
=;
wherein,is a tentative shielding quality index of the fault-free cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the second pulse signal received by the pulse signal receiving unit;
s34, changing the frequency of the first pulse signal sent by the pulse signal sending unit, returning to S31, repeating 10 times, and taking the average value of the temporary shielding quality indexes of the fault-free cable obtained by 10 times of calculation as the shielding quality index of the fault-free cable.
8. The shielding quality detection system of a copper core control cable according to claim 7, wherein in S4, the pulse signal transceiver module measures the shielding quality index of the faulty cable and the location of the fault point, comprising the steps of:
s41, a pulse signal coupling unit couples the pulse signal transmitting unit to a core wire of the cable;
s42, the pulse signal transmitting unit transmits a pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through a cable;
s43, the calculation unit calculates the tentative shielding quality index of the fault cable according to the signals received by the pulse signal receiving unit through the following formula:
=;
wherein,is a tentative shielding quality index of the faulty cable, < ->Signal amplitude of the first pulse signal transmitted for the pulse signal transmitting unit, < >>Signal amplitude of the third pulse signal received by the pulse signal receiving unit;
s44, according to the following formula, according to the position of the fault point:
D=0.5*t*speed；
wherein D is the distance between the fault point and the pulse signal transmitting unit, t is the time from the transmission of the pulse signal to the reception of the reflected signal, and the time is measured by the pulse signal receiving unit; speed is the wave speed, which is determined by the frequency of the first pulse signal sent by the pulse signal sending unit;
s45, changing the frequency of the first pulse signal sent by the pulse signal sending unit, returning to S41, repeating 10 times, and taking the average value of the temporary shielding quality indexes of the fault cable obtained by 10 times of calculation as the shielding quality index of the fault cable.
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