CN112013758A - Multi-parameter detection method and device for coiled cable and detection clamp - Google Patents
Multi-parameter detection method and device for coiled cable and detection clamp Download PDFInfo
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- CN112013758A CN112013758A CN202011104110.4A CN202011104110A CN112013758A CN 112013758 A CN112013758 A CN 112013758A CN 202011104110 A CN202011104110 A CN 202011104110A CN 112013758 A CN112013758 A CN 112013758A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/32—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring areas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a multi-parameter detection method, a multi-parameter detection device and a multi-parameter detection clamp for a coiled cable, wherein the method comprises the following steps: step 1: detecting the cable length and the cable resistance of the coiled cable; detecting the length of the cable: applying a voltage pulse at the first end of the cable, recording the propagation time of a reflected pulse from the application of the voltage pulse to the return of the voltage pulse to the first end of the cable, and calculating to obtain the length of the cable by combining the propagation speed of the voltage pulse; detecting the resistance of the cable: after the detection current is introduced into the cable, the cable voltage at two ends of the cable is detected, and the cable resistance is calculated; step 2: and calculating the sectional area of the cable by using the length of the cable and the resistance of the cable and according to the resistivity of the cable conductor of the coiled cable. By adopting the scheme, the on-site multi-parameter detection of the coiled cable can be realized, and the on-site multi-parameter detection can be realized without intercepting the cable or spreading the coiled cable.
Description
Technical Field
The invention relates to the field of parameter detection of coiled cables, in particular to a multi-parameter detection method and device of a coiled cable and a detection clamp.
Background
With the rapid advance of urbanization in China, the demand of power cables is rapidly increased year by year. Reliable operation of power cables has a significant impact on the normal life and the socioeconomic development of people. The cable manufacturing process is relatively simple, the entrance requirement of a cable supplier is low, the number of suppliers is large, but some suppliers have the problems of poor quality control, products which are not up to the standard and the like, so that the phenomena of seriously small conductor section, unqualified conductor resistance and length and the like of the cable entering the network occur. In recent years, therefore, countries have begun to focus on the quality of cables.
At present, the parameter test of the cable mainly takes sampling detection as a main part, a cable sample is intercepted from a coiled cable, and the detection of resistance, sectional area and the like is carried out. The detection scheme can not detect the parameters of the whole coiled cable, is difficult to carry out general detection on all coiled cables, can not realize on-site detection of the cable, and has great limitation; except for a special detection mechanism, the detection of the coiled cable on the spot can only be carried out by single parameter detection, and the simultaneous detection of multiple parameters is difficult to realize. In addition, the detection record is in an island state, and the history record of the quality of the coiled cable lacks an effective system recording and feedback mechanism, so that the cable supplier has lucky psychology on the network entry of the quality-poor cable.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a multi-parameter detection method, a multi-parameter detection device and a multi-parameter detection clamp for a coiled cable, and aims to realize rapid multi-parameter detection on the coiled cable on the spot.
The technical scheme is as follows: the invention provides a detection clamp for multi-parameter detection of coiled cables, which comprises: a housing, a plurality of ejector pins and a probe, wherein:
the shell is cylindrical, and the middle part of the shell is axially communicated;
the ejector rod is made of a conductor material, is arranged on the side face of the shell and extends from the outer side of the shell to the middle through part of the shell;
the probe is made of a conductor material, is arranged on a bracket which radially penetrates through the shell and is positioned at a middle penetrating part of the shell.
Specifically, one end of the ejector rod, which is arranged on the inner side of the shell, is in a needle point shape; the number of the probes is at least more than two, the probes are arranged on a sliding block, and the sliding block is arranged on the support and used for moving on the support.
The invention also provides a multi-parameter detection method of the coiled cable, which applies the detection clamp for multi-parameter detection of the coiled cable and comprises the following steps:
step 1: detecting the cable length and the cable resistance of the coiled cable;
detecting the length of the cable: adjusting an ejector rod to clamp a detection clamp at a first end of a cable, contacting a probe with a core of the cable to be detected, electrically contacting the ejector rod with the core of the cable to be detected, applying a voltage pulse at the first end of the cable through the ejector rod and the probe, recording the propagation time from the application of the voltage pulse to the return of a reflected pulse of the voltage pulse to the first end of the cable, and calculating to obtain the length of the cable by combining the propagation speed of the voltage pulse;
detecting the resistance of the cable: adjusting the ejector rod to clamp the two detection clamps at two ends of the cable respectively, contacting probes of the two detection clamps with a core of the cable to be detected, detecting to obtain cable voltages at two ends of the cable after the probes of the two detection clamps introduce detection currents into the cable, and calculating to obtain cable resistance;
step 2: and calculating the sectional area of the cable by using the length of the cable and the resistance of the cable and according to the resistivity of the cable conductor of the coiled cable.
Specifically, the cable length is calculated by the following formula:
L=1/2（V×T），
where L denotes the cable length, V denotes the propagation speed of the voltage pulse and T denotes the propagation time.
Specifically, after the detection current is introduced into the cable, the resistance voltage at two ends of a standard resistor connected in series with the cable in the detection circuit is calculated according to the resistance value of the standard resistor, the resistance voltage and the cable voltage to obtain the cable resistance.
Specifically, converting the cable resistance at the ambient temperature to obtain the cable resistance at the standard temperature, and outputting the cable resistance at the standard temperature;
the following formula is used for conversion:
Rt=Ra(T+tt)/(T+ta)，
wherein R istIs the cable resistance at standard temperature, RaIs the cable resistance at ambient temperature, T is the conversion factor, TtIs the standard temperature, taIs ambient temperature.
Specifically, the cable sectional area is calculated by the following formula:
S=ρ(L/R)，
wherein S represents a cable sectional area, ρ represents a cable conductor resistivity, L represents a cable length, and R represents a cable resistance.
Specifically, after the cable length, the cable resistance and the cable sectional area of the coiled cable are obtained through calculation, the coiled cable is uploaded to a cloud server for sharing, and classification is carried out according to the source of the coiled cable, so that the cable parameter qualification rate of the coiled cable from each source is obtained.
The invention also provides a multi-parameter detection device of the coiled cable, which comprises the following components: access unit, detecting element and calculating unit, and the detection clip for multi-parameter detection of coiled cables that the present invention provides is applied, wherein:
the access unit is used for applying voltage pulse to the first end of the cable through the probe and the ejector rod, and is used for accessing the two ends of the cable into the circuit through the probe and then introducing detection current;
the detection unit is used for recording the propagation time of a reflected pulse from the applied voltage pulse to the voltage pulse back to the first end of the cable and detecting the cable voltage at two ends of the cable;
the calculation unit is used for calculating the length of the cable by combining the propagation speed of the voltage pulse, calculating the resistance of the cable, and calculating the sectional area of the cable according to the resistivity of the cable conductor of the coiled cable.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the on-site multi-parameter detection of the coiled cable is realized, the cable does not need to be intercepted or the coiled cable is laid out, and meanwhile, the qualified quality of the coiled cable is recorded according to the source of the coiled cable, so that an effective historical record and feedback mechanism of the quality of the coiled cable are formed.
Drawings
FIG. 1 is a schematic flow chart of a multi-parameter detection method for a coiled cable according to the present invention;
FIG. 2 is a schematic circuit diagram of cable resistance detection provided by the present invention;
FIG. 3 is a schematic view of a test clip provided in the present invention for testing the length of a cable;
FIG. 4 is a schematic diagram of a detection clip provided in the present invention for detecting the resistance of a cable;
1-a shell; 2-a top rod; 3-a probe; 4-a scaffold; 5-a slide block; 6-test line.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Fig. 1 is a schematic flow chart of a multi-parameter detection method for a coiled cable according to the present invention.
In the embodiment of the invention, the length of the detection cable is as follows: and applying a voltage pulse at the first end of the cable, recording the propagation time of a reflected pulse from the application of the voltage pulse to the voltage pulse back to the first end of the cable, and calculating the length of the cable by combining the propagation speed of the voltage pulse.
In the embodiment of the invention, the length of the cable is calculated by adopting the following formula:
L=1/2（V×T），
where L denotes the cable length, V denotes the propagation speed of the voltage pulse and T denotes the propagation time.
In a specific implementation, the cable length may be detected using pulse-echo. Injecting low-voltage pulse between the first end of the cable to the cable core and the metal shielding layer of the cable core, wherein the low-voltage pulse is transmitted to an impedance mismatching point (the other end of the cable) along the cable to generate reflected waves (reflected pulses), and the reflected waves are transmitted to the first end of the cable along the cable again and recorded. The cable length of the coiled cable can be calculated according to the time difference (the propagation speed of the voltage pulse) of the transmitted pulse and the reflected pulse on the pulse waveform multiplied by the propagation speed of the voltage pulse in the cable.
In the embodiment of the invention, the detection of the cable resistance: and (4) detecting to obtain the cable voltage at the two ends of the cable after the detection current is introduced into the cable, and calculating to obtain the cable resistance.
In a specific implementation, the detection current led to the cable is known, and after the voltage of the cable at two ends of the cable is detected, the resistance of the cable can be calculated according to ohm's law.
Fig. 2 is a schematic circuit diagram of the cable resistance detection according to the present invention.
In the embodiment of the invention, after the detection current is introduced into the cable, the resistance voltage at two ends of the standard resistor connected with the cable in series in the detection circuit is calculated according to the resistance value of the standard resistor, the resistance voltage and the cable voltage to obtain the cable resistance.
As shown in the figure, RIAnd R0Can be a standard resistor with low temperature drift (the resistance value is little influenced by temperature), and measures UIBound to RIAnd calculating the detection current I for detecting the output current of the constant current power supply and ensuring the accuracy of the output current value. Respectively testing standard resistance R0And a cable core conductor resistance RxVoltage U ofoAnd UxPassing through a standard resistor R0And a cable core conductor resistance RxThe following calculation formula can be obtained:
Rx=（Ux/Uo）R0，
wherein the standard resistance R0Is to measure the conductor resistance R of the core of the cablexThe accuracy of the resistance of the measured cable is further verified, and compared with the method of measuring the resistance by adopting a bridge method in the prior art, the resistance value can be more stably and accurately detected.
In the embodiment of the invention, the cable resistance at the ambient temperature is converted to obtain the cable resistance at the standard temperature, and the cable resistance at the standard temperature is output;
the following formula is used for conversion:
Rt=Ra(T+tt)/(T+ta)，
wherein R istIs the cable resistance at standard temperature, RaFor the cable resistance at ambient temperature, T is the conversion factor (determined by the cable core conductor, copper 235, aluminum 225), TtIs the standard temperature, taIs ambient temperature.
In specific implementation, the cable resistance is converted to the cable resistance at the standard temperature, so that whether the cable resistance meets related requirements or not can be determined more intuitively.
And 2, calculating to obtain the sectional area of the cable according to the resistivity of the cable conductor of the coiled cable by using the length and the resistance of the cable.
In the embodiment of the invention, the sectional area of the cable is calculated by adopting the following formula:
S=ρ(L/R)，
wherein S represents a cable sectional area, ρ represents a cable conductor resistivity, L represents a cable length, and R represents a cable resistance.
In specific implementation, the resistivity of the cable conductor is determined according to the cable core conductor, and whether the cable section of the coiled cable is qualified or not can be determined after the cable section is obtained through calculation.
In specific implementation, the detection scheme can realize rapid multi-parameter detection on the coiled cable on the spot without intercepting the cable or spreading the coiled cable.
In specific implementation, after the cable parameters are detected, the cable parameters can be displayed, and whether the cable parameters are qualified or not can be displayed according to the parameter requirements.
In the embodiment of the invention, after the cable length, the cable resistance and the cable sectional area of the coiled cable are obtained through calculation, the coiled cable is uploaded to a cloud server for sharing, and classification is carried out according to the source of the coiled cable, so that the cable parameter qualification rate of the coiled cable from each source is obtained.
In the specific implementation, by recording and sharing the qualified rate of the cable parameters of each cable supplier, a cable quality historical record of the system can be formed, the cable quality condition of each cable supplier is reflected, and cable suppliers with cable quality not being too high are attacked.
Referring to fig. 3 and 4, schematic diagrams of the detection clip provided by the present invention for detecting the length of the cable and the detection clip provided by the present invention for detecting the resistance of the cable are shown
The embodiment of the invention also provides a detection clamp for multi-parameter detection of coiled cables, which comprises: a housing 1, a plurality of plungers 2 and a probe 3, wherein:
the shell 1 is cylindrical, and the middle part of the shell is axially through;
the ejector rod 2 is made of a conductor material, is arranged on the side surface of the shell 1, and extends from the outer side of the shell 1 to the middle through part of the shell 1;
the probe 3 is made of a conductive material, is arranged on a bracket 4 which radially penetrates through the shell 1 and is positioned at a middle penetrating part of the shell 1.
In the embodiment of the invention, one end of the ejector rod 2, which is arranged on the inner side of the shell 1, is in a needle point shape; the number of the probes 3 is at least more than two, the probes are arranged on a sliding block 5, and the sliding block 5 is arranged on the support 4 and used for moving on the support 4.
In the embodiment of the present invention, the detection clamp provided by the present invention is used for multi-parameter detection of a coiled cable, and includes:
detecting the length of the cable: adjusting the ejector rod 2 to clamp the detection clamp at the first end of the cable, contacting the probe 3 with a cable core to be detected by moving the sliding block 5, piercing the outer sheath of the cable by using the ejector rod 2 and electrically contacting the cable core to be detected (the ejector rod is contacted with a metal shielding layer or the cable core), applying voltage pulse at the first end of the cable by using the ejector rod 2 and the probe 3, recording the propagation time from the application of the voltage pulse to the return of the reflected pulse of the voltage pulse to the first end of the cable, and calculating the length of the cable by combining the propagation speed of the voltage pulse;
detecting the resistance of the cable: adjusting ejector pin 2 and pressing from both sides two detection clamps at the cable both ends respectively, can detect the probe 3 and the cable core contact that awaits measuring of pressing from both sides two detection through removing slider 5, detect the cable voltage that obtains the cable both ends after the probe 3 that presss from both sides lets in the measuring current to the cable through two detection, calculate and obtain cable resistance.
In a specific implementation, the voltage pulse propagation time, the voltage detection, the cable length calculation, the cable resistance calculation and the cable cross-sectional area calculation, and the related units can be integrated in the cable parameter detection device.
In the specific implementation, the test wire 6 is connected to the probe 3 and the ejector rod 2 when the length of the cable is detected, and voltage pulse is applied through the test wire 6; the probes 3 connected to the test clips at both ends of the cable apply a test current through the test wire 6 when detecting the resistance of the cable.
In specific implementation, a plurality of probes 3 contact the cable core to be tested simultaneously, so that the contact reliability can be ensured. The detection clamp provided by the embodiment of the invention can be reliably clamped at one end of a cable and is matched with multi-parameter detection.
The embodiment of the invention also provides a multi-parameter detection device of the coiled cable, which comprises the following components: the device comprises an access unit, a detection unit and a calculation unit, and is applied to a detection clamp for multi-parameter detection of the coiled cable, wherein the detection clamp comprises a detection unit and a calculation unit, and the detection unit is used for detecting multiple parameters of the coiled cable, and comprises the following components:
the access unit is used for applying voltage pulse to the first end of the cable through the probe and the ejector rod, and is used for accessing the two ends of the cable into the circuit through the probe and then introducing detection current;
the detection unit is used for recording the propagation time of a reflected pulse from the applied voltage pulse to the voltage pulse back to the first end of the cable and detecting the cable voltage at two ends of the cable;
the calculation unit is used for calculating the length of the cable by combining the propagation speed of the voltage pulse, calculating the resistance of the cable, and calculating the sectional area of the cable according to the resistivity of the cable conductor of the coiled cable.
The multi-parameter detection device of the coiled cable in the embodiment of the invention can be used in cooperation with the detection clamp.
In an embodiment of the present invention, the calculating unit is configured to calculate the length of the cable by using the following formula:
L=1/2（V×T），
where L denotes the cable length, V denotes the propagation speed of the voltage pulse and T denotes the propagation time.
In the embodiment of the invention, the access unit is used for introducing detection current to the cable; the detection unit is used for detecting the resistance voltage at two ends of a standard resistor connected with the cable in series in the circuit; and the calculation unit is used for calculating the cable resistance according to the resistance value of the standard resistor, the resistance voltage and the cable voltage.
In the embodiment of the invention, the calculation unit is used for converting the cable resistance at the ambient temperature to obtain the cable resistance at the standard temperature and outputting the cable resistance at the standard temperature;
the following formula is used for conversion:
Rt=Ra(T+tt)/(T+ta)，
wherein R istIs the cable resistance at standard temperature, RaAs cables at ambient temperatureResistance, T is the conversion factor, TtIs the standard temperature, taIs ambient temperature.
In an embodiment of the present invention, the calculating unit is configured to calculate a cable sectional area by using the following formula:
S=ρ(L/R)，
wherein S represents a cable sectional area, ρ represents a cable conductor resistivity, L represents a cable length, and R represents a cable resistance.
In the embodiment of the invention, the calculation unit is used for calculating the cable length, the cable resistance and the cable sectional area of the coiled cable, sharing the cable length, the cable resistance and the cable sectional area with other cable parameter detection (test) equipment or devices by the uploading cloud server, classifying according to the source of the coiled cable, and obtaining the cable parameter qualification rate of the coiled cable of each supplier.
Claims (9)
1. A test clip for multiparameter testing of coiled cables, comprising: a housing, a plurality of ejector pins and a probe, wherein:
the shell is cylindrical, and the middle part of the shell is axially communicated;
the ejector rod is made of a conductor material, is arranged on the side face of the shell and extends from the outer side of the shell to the middle through part of the shell;
the probe is made of a conductor material, is arranged on a bracket which radially penetrates through the shell and is positioned at a middle penetrating part of the shell.
2. The clamp of claim 1, wherein the plunger has a tip shape at one end inside the housing; the number of the probes is at least more than two, the probes are arranged on a sliding block, and the sliding block is arranged on the support and used for moving on the support.
3. A method for multiparameter testing of a coiled cable, characterized in that the use of a test clip for multiparameter testing of a coiled cable according to claim 1 or 2 comprises:
step 1: detecting the cable length and the cable resistance of the coiled cable;
detecting the length of the cable: adjusting an ejector rod to clamp a detection clamp at a first end of a cable, contacting a probe with a core of the cable to be detected, electrically contacting the ejector rod with the core of the cable to be detected, applying a voltage pulse at the first end of the cable through the ejector rod and the probe, recording the propagation time from the application of the voltage pulse to the return of a reflected pulse of the voltage pulse to the first end of the cable, and calculating to obtain the length of the cable by combining the propagation speed of the voltage pulse;
detecting the resistance of the cable: adjusting the ejector rod to clamp the two detection clamps at two ends of the cable respectively, contacting probes of the two detection clamps with a core of the cable to be detected, detecting to obtain cable voltages at two ends of the cable after the probes of the two detection clamps introduce detection currents into the cable, and calculating to obtain cable resistance;
step 2: and calculating the sectional area of the cable by using the length of the cable and the resistance of the cable and according to the resistivity of the cable conductor of the coiled cable.
4. The multi-parameter detection method of a coiled cable according to claim 3, wherein the cable length is calculated using the following formula:
L=1/2（V×T），
where L denotes the cable length, V denotes the propagation speed of the voltage pulse and T denotes the propagation time.
5. The multi-parameter detection method of the coiled cable according to claim 4, wherein the calculating the cable resistance comprises:
and after the detection current is introduced into the cable, detecting the resistance voltage at two ends of a standard resistor connected in series with the cable in the circuit, and calculating to obtain the cable resistance according to the resistance value of the standard resistor, the resistance voltage and the cable voltage.
6. The multi-parameter detection method of the coiled cable according to claim 5, wherein the calculating a cable resistance comprises:
converting the cable resistance at the ambient temperature to obtain the cable resistance at the standard temperature, and outputting the cable resistance at the standard temperature;
the following formula is used for conversion:
Rt=Ra(T+tt)/(T+ta)，
wherein R istIs the cable resistance at standard temperature, RaIs the cable resistance at ambient temperature, T is the conversion factor, TtIs the standard temperature, taIs ambient temperature.
7. The multi-parameter detection method of the coiled cable according to claim 6, wherein the calculating a cable cross-sectional area comprises:
calculating the cable sectional area by adopting the following formula:
S=ρ(L/R)，
wherein S represents a cable sectional area, ρ represents a cable conductor resistivity, L represents a cable length, and R represents a cable resistance.
8. The multi-parameter detection method of a coiled cable according to claim 7, comprising:
and after calculating the cable length, the cable resistance and the cable sectional area of the coiled cable, uploading the cable length, the cable resistance and the cable sectional area to a cloud server for sharing, classifying according to the source of the coiled cable, and obtaining the cable parameter qualification rate of the coiled cable of each source.
9. A multi-parameter sensing device for coiled cables, comprising: access unit, detection unit and calculation unit, and applying a detection clamp for multiparameter detection of coiled cables according to claim 1 or 2, wherein:
the access unit is used for applying voltage pulse to the first end of the cable through the probe and the ejector rod, and is used for accessing the two ends of the cable into the circuit through the probe and then introducing detection current;
the detection unit is used for recording the propagation time of a reflected pulse from the applied voltage pulse to the voltage pulse back to the first end of the cable and detecting the cable voltage at two ends of the cable;
the calculation unit is used for calculating the length of the cable by combining the propagation speed of the voltage pulse, calculating the resistance of the cable, and calculating the sectional area of the cable according to the resistivity of the cable conductor of the coiled cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011104110.4A CN112013758A (en) | 2020-10-15 | 2020-10-15 | Multi-parameter detection method and device for coiled cable and detection clamp |
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| CN202011104110.4A CN112013758A (en) | 2020-10-15 | 2020-10-15 | Multi-parameter detection method and device for coiled cable and detection clamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295081A (en) * | 2021-04-15 | 2021-08-24 | 江苏省电力试验研究院有限公司 | Coiled cable length measuring system and method based on time-frequency domain |
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2020
- 2020-10-15 CN CN202011104110.4A patent/CN112013758A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295081A (en) * | 2021-04-15 | 2021-08-24 | 江苏省电力试验研究院有限公司 | Coiled cable length measuring system and method based on time-frequency domain |
| CN113295081B (en) * | 2021-04-15 | 2023-09-22 | 江苏省电力试验研究院有限公司 | Time-frequency domain-based coiled cable length measurement system and method |
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