CN215374053U - Whole dish cable conductor quality short-term test device - Google Patents
Whole dish cable conductor quality short-term test device Download PDFInfo
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- CN215374053U CN215374053U CN202121493922.2U CN202121493922U CN215374053U CN 215374053 U CN215374053 U CN 215374053U CN 202121493922 U CN202121493922 U CN 202121493922U CN 215374053 U CN215374053 U CN 215374053U
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Abstract
The utility model discloses a device for quickly detecting the quality of a whole cable conductor, which comprises a power adapter, an industrial personal computer, a cable resistance measuring device, a cable section measuring device, a cable capacitance measuring device and a cable length measuring device, wherein the power adapter is connected with the industrial personal computer, and the industrial personal computer is in signal connection with the cable resistance measuring device, the cable section measuring device, the cable capacitance measuring device and the cable length measuring device. The utility model introduces a traveling wave measurement technology and an image recognition technology, combines measurement of multiple electrical parameters, measures and calculates the sectional area, the resistance per unit length and the equivalent length of a cable conductor by multiple means, and can accurately judge whether the cable has the problem of internal work stealing and material reduction.
Description
Technical Field
The utility model belongs to the field of electrical automation, and particularly relates to a device for quickly detecting the quality of a whole cable drum.
Background
The cable is a necessary device in the process of transmitting electric energy and manufacturing electrical equipment, and is a necessity in future electrification and information-based society. The power cable is also widely applied to the engineering construction of China, and the sales volume of the cable industry in 2014 reaches 1.2 trillion yuan. By the end of 2015, the yield value of the cable industry in China is more than 500 ten thousand yuan, which is close to 4000 families, and the market share occupied by the largest enterprise is only 1% to 2%. Since most of cable production enterprises are small-scale enterprises, the enterprises are competitive, the enterprises often steal work and reduce materials for higher profits, and when some major engineering projects use the cables which do not reach the standard, once problems occur, serious consequences can be brought.
However, some suppliers reduce the cost by compressing the amount of raw materials, especially cable conductors, to produce an unacceptable product. The problems of the current cable conductor are as follows: inferior copper and regenerated copper are used; the sectional area of a cable conductor is reduced, and the cable core is shrunk and slimmed; the end cable is produced according to the standard, the section of a conductor in the middle section of the cable is reduced, and the characteristics of thick two ends and thin middle part are presented; the length of the cable is 'jump meter', the actual length is less than the length of the nameplate thereof, and the like.
At present mainly adopt modes such as direct current resistance, measurement diameter to carry out sampling test to the cable, mainly carry out the mode that the laboratory detected through a small amount of sample cables of intercepting tip and carry out the quality and keep silent, not only operating procedure is numerous and diverse, consuming time long, still has unable direct measurement sectional area, length, interlude quality scheduling problem: firstly, the sectional area of a cable conductor cannot be accurately measured, and the error is large when the vernier caliper measures the diameter of the conductor because a gap exists in a stranded conductor; secondly, the length of the cable cannot be measured, only rough judgment can be carried out by reading the surface identification of the cable sheath, and direct measurement cannot be carried out; thirdly, the quality problem of the middle section of the cable cannot be detected, and the existing detection means can only verify whether the direct current resistance of a small section of sample at the end part of the tested cable meets the requirement or not, so that the quality problem of the middle section of the cable cannot be found. Therefore, for the most concerned indexes of the cable user, such as sectional area, length, resistance and the like, no quick, effective and accurate detection method exists on the site, and research on related detection technologies is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for rapidly detecting the quality of a whole-disc cable conductor, which comprehensively considers the measurement requirements of various cables, integrates multiple measurement methods and functions, and can comprehensively and accurately detect the cable conductor through different measurement combinations.
The utility model provides a quick detection device of whole dish cable conductor quality, includes power adapter, industrial computer, cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device, and power adapter connects the industrial computer, and industrial computer signal connection cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device.
The cable resistance measuring device comprises a cable resistance measuring single chip microcomputer, a power supply management module, a constant current source, two ADC (analog to digital converter) conversion modules, a resistance measuring module and a four-wire output and isolation protection module, wherein the power supply management module is connected with the cable resistance measuring single chip microcomputer and the constant current source and used for supplying power to the cable resistance measuring device; the resistance measurement module is connected with another ADC conversion module, the ADC conversion module is also connected with a cable resistance measurement single chip microcomputer, the standard resistance and the resistance measurement module are both connected with the four-wire output and isolation protection module, and the four-wire output and isolation protection module is connected with an output four-core interface for connecting a tested piece. The power supply management module and the constant current source are used for supplying power, and the ADC conversion module is used for acquiring measurement data and transmitting the measurement data to the cable resistance measurement single chip microcomputer. The cable resistance measurement singlechip is provided with a 232 communication interface, the 232 communication interface is connected with a USB-to-232 module, and the USB-to-232 module is connected with an industrial personal computer USB.
Specifically, the cable cross section measuring device comprises a cable cross section measuring single chip microcomputer and a fixed focus camera, wherein the fixed focus camera is connected with the cable cross section measuring single chip microcomputer, and the cable cross section measuring single chip microcomputer is connected with an industrial personal computer through a 232 communication interface.
Specifically, the cable capacitance measuring device comprises a cable capacitance measuring single chip microcomputer, a power management module, a constant current source, a double-arm bridge capacitance measuring module, a four-wire output and isolation protection module and an ADC (analog to digital converter) conversion module, wherein the cable capacitance measuring single chip microcomputer is provided with a 232 communication interface, the 232 communication interface is connected with a USB (universal serial bus) to 232 module, the USB to 232 module is connected with an industrial personal computer (USB), the power management module is connected with the constant current source, the cable capacitance measuring single chip microcomputer is used for supplying power, the constant current source is connected with the double-arm bridge capacitance measuring module, the double-arm bridge capacitance measuring module is connected with the four-wire output and isolation protection module and the ADC conversion module, the four-wire output and isolation protection module is connected with a tested piece, the ADC conversion module is connected with the cable capacitance measuring single chip microcomputer, and the cable capacitance measuring single chip microcomputer acquires a measuring result through the ADC conversion module.
Specifically, the cable length measuring device adopts a traveling wave measuring device and comprises a cable length measuring singlechip, a power management module, a high-voltage module, an impedance matching module, a relay triggering module and a data acquisition module, wherein the cable length measuring singlechip is provided with a 232 communication interface, the 232 communication interface is connected with a USB-to-232 module, and the USB-to-232 module is connected with a USB of an industrial personal computer; the power management module is connected with the high-voltage module and the cable length measuring single chip microcomputer, the cable length measuring single chip microcomputer is connected with the relay trigger module, the relay trigger module is connected with the high-voltage module, the high-voltage module is connected with the impedance matching module, the impedance matching module is connected with the data acquisition module, and the data acquisition module is directly connected with the industrial personal computer. The control of the high-voltage module is realized by controlling the relay trigger module through the cable length measuring singlechip, the high-voltage module is used for outputting an excitation signal, and the data acquisition module acquires a traveling wave signal and transmits the traveling wave signal to the industrial personal computer.
The cable resistance measuring singlechip, the cable length measuring singlechip, the cable capacitance measuring singlechip and the cable section measuring singlechip can adopt STM32F 407.
Furthermore, a pre-stage processing loop and a post-stage processing loop are added in a square wave source of the traveling wave measuring device for impedance self-adaptive matching, a high-voltage module is connected with the pre-stage processing loop and a 50 omega resistor in series after being connected with a 1M resistor, the pre-stage processing loop is connected with a charging voltage acquisition signal module, the 50 omega resistor is connected with a trigger signal switch in series and then connected with the post-stage processing loop and a measured cable, and the post-stage processing loop is connected with a voltage waveform signal acquisition module.
The utility model creatively measures the traveling wave and combines with multi-electrical parameter measurement to measure and calculate the sectional area, the resistance per unit length and the length equivalence of the cable conductor by various means, thereby providing a more effective and accurate means for a user to detect the cable conductor. Through calculating various measuring results, whether the cable has the problem of internal work stealing and material reduction can be accurately judged.
Drawings
Fig. 1 is a block diagram of the structure of the device for rapidly detecting the quality of the conductor of the whole-disc cable.
FIG. 2 is a schematic view of a traveling wave measurement;
FIG. 3 is a schematic diagram of traveling wave measurement;
fig. 4 is a schematic diagram of a square wave source of the traveling wave measurement module of the present invention.
Fig. 5 is a schematic waveform diagram.
FIG. 6 is a block diagram of the hardware schematic of the resistance measurement module.
FIG. 7 is a schematic block diagram of the capacitance measurement module hardware.
Detailed Description
The utility model is explained in further detail below with reference to the drawings.
As shown in figure 1, a quick detection device of whole dish cable conductor quality, including power adapter, the industrial computer, cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device, power adapter connects the industrial computer, industrial computer signal connection cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device, through the industrial computer to cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device output control signal, and receive information collection.
The cable resistance measuring device comprises a cable resistance measuring single chip microcomputer, a power management module, a constant current source, two ADC conversion modules, a resistance measuring module and a four-wire output and isolation protection module, wherein the power management module is connected with the cable resistance measuring single chip microcomputer and the constant current source and used for supplying power to the cable resistance measuring device; the resistance measurement module is connected with another ADC conversion module, the ADC conversion module is also connected with a cable resistance measurement single chip microcomputer, the standard resistance and the resistance measurement module are both connected with the four-wire output and isolation protection module, and the four-wire output and isolation protection module is connected with an output four-core interface for connecting a tested piece. The power supply management module and the constant current source are used for supplying power, and the ADC conversion module is used for acquiring measurement data and transmitting the measurement data to the cable resistance measurement single chip microcomputer. The cable resistance measurement singlechip is provided with a 232 communication interface, the 232 communication interface is connected with a USB-to-232 module, and the USB-to-232 module is connected with an industrial personal computer USB.
The cable section measuring device comprises a cable section measuring single chip microcomputer and a fixed focus camera, the fixed focus camera is connected with the cable section measuring single chip microcomputer, and the cable section measuring single chip microcomputer is connected with an industrial personal computer through a 232 communication interface.
The cable capacitance measuring device comprises a cable capacitance measuring single chip microcomputer, a power management module, a constant current source, a double-arm bridge capacitance measuring module, a four-wire output and isolation protection module, an ADC (analog to digital converter) conversion module, the cable capacitance measuring single chip microcomputer is provided with a 232 communication interface, the 232 communication interface is connected with a USB (universal serial bus) to 232 module, the USB to 232 module is connected with an industrial personal computer USB, the power management module is connected with the constant current source, the cable capacitance measuring single chip microcomputer is used for supplying power, the constant current source is connected with the double-arm bridge capacitance measuring module, the double-arm bridge capacitance measuring module is connected with the four-wire output and isolation protection module and the ADC conversion module, the four-wire output and isolation protection module is connected with a tested piece, the ADC conversion module is connected with the cable capacitance measuring single chip microcomputer, and the cable capacitance measuring single chip microcomputer acquires a measuring result through the ADC conversion module.
The cable length measuring device adopts a traveling wave measuring device and comprises a cable length measuring singlechip, a power supply management module, a high-voltage module, an impedance matching module, a relay triggering module and a data acquisition module, wherein the cable length measuring singlechip is provided with a 232 communication interface, the 232 communication interface is connected with a USB-to-232 module, and the USB-to-232 module is connected with an industrial personal computer USB; the power management module is connected with the high-voltage module and the cable length measuring single chip microcomputer, the cable length measuring single chip microcomputer is connected with the relay trigger module, the relay trigger module is connected with the high-voltage module, the high-voltage module is connected with the impedance matching module, the impedance matching module is connected with the data acquisition module, and the data acquisition module is directly connected with the industrial personal computer. The control of the high-voltage module is realized by controlling the relay trigger module through the cable length measuring singlechip, the high-voltage module is used for outputting an excitation signal, and the data acquisition module acquires a traveling wave signal and transmits the traveling wave signal to the industrial personal computer.
In the utility model, the traveling wave measurement is realized based on the transmitted wave principle. Referring to fig. 2 and 3, the traveling wave velocity of the transmission line for a uniform medium is derived according to maxwell's equations and is constant, when the traveling wave is transmitted to the end of the cable 700 to be measured, the traveling wave is totally reflected at the end of the cable due to the open circuit at the end of the cable, and the length of the whole cable can be calculated by collecting the time when the totally reflected wave reaches the measuring end. Let t be t0When the rectangular pulse voltage is input into the core and the shielding layer of the cable, t is t1The reflected wave at the end of the cable is collected at the input end of the pulse at any moment, and the length of the cable is set as v when the propagation speed of the traveling wave in the cable is set as v
According to the principle, the cable length with the wave speed close to constant can be measured. The wave speed and the time are determined, and the method is particularly important for accurately measuring the length of the cable.
A popular technique for generating a fast square wave is pulse forming lines. However, the measured waveform has problems because the pulse forming line inside the square wave source is not generally matched to the impedance of the cable 700 being measured, resulting in multiple reflections being transmitted. As shown in fig. 4, a pre-processing loop 202 and a post-processing loop 203 are added in the traveling wave measurement apparatus, a high-voltage module is connected with the pre-processing loop 202 and a 50 Ω resistor after being connected with a 1M resistor in series, the pre-processing loop 202 is connected with a charging voltage acquisition signal module, the 50 Ω resistor is connected with a trigger signal switch in series and then connected with the post-processing loop 203 and the cable 700 to be measured, the post-processing loop 203 is connected with a voltage waveform signal acquisition module, and the charging voltage acquisition signal module and the voltage waveform signal acquisition module form a data acquisition module. When the traveling wave measuring device is developed, the pre-stage processing loop 202 and the post-stage processing loop 203 are added in the square wave source, impedance self-adaption matching can be performed, a good waveform can be obtained no matter how the impedance of the measured cable 700 is, and the acquired waveform is schematically shown in FIG. 5.
For a coaxial cable, the wave velocity is mainly determined by the dielectric constant ∈ of the insulating material, and can be calculated by equation (1):
in the aspect of time determination, in order to meet the precision requirement, an ultra-high-speed data acquisition card is arranged in the traveling wave measuring device, the sampling rate is up to 2G/s, an upper computer algorithm is matched, the error of traveling wave incidence and reflection time is not more than 2ns, and the precision and the stability of the traveling wave measuring device are far higher than those of manual reading identification. Due to the limitations of wave process transition and time resolution, the minimum testable length of a conventional cable length measuring product is usually close to 100 meters, and many lengths of high-voltage power cables which are actually regarded as important are only dozens of meters, so that the requirements of field use cannot be met. Based on a technically advanced square wave source and ultrahigh sampling resolution, the traveling wave measuring device can measure 15m cables at minimum.
The cable resistance measurement hardware principle is shown in fig. 6. The device has a constant current source for generating a direct current. When the resistance is measured, constant current enters the tested object from the I + and I-ends, the current generates a corresponding voltage value on the tested resistance, the resistance measuring and calculating module obtains the voltage value, and the voltage value is compared with the voltage value on the internal standard resistance to calculate the tested resistance value. In order to ensure the measurement precision, the current and the voltage are connected with the measured body by adopting a four-terminal method, and the influence of contact resistance is eliminated so as to ensure the measurement precision. The cable resistance measuring device is characterized in that a voltage stabilizing source is connected in series with a first constant current source and then connected in series with a second constant current source, the second constant current source is connected in parallel with a measured resistor, a signal processing module is connected between the first constant current source and the second constant current source, the signal processing module is connected with a digital display module, and the first constant current source is connected with a constant current control module.
The resistance measuring module measures the resistance of the cable conductor and calculates the resistance according to the following modes:
the resistivity of the cable in unit length (calculated by the nominal length of the conductor) can be compared with the national standard;
secondly, calculating the length of the cable by measuring the resistance of the intercepted part of the cable and the longer cable, and comparing the length of the cable with a nominal value;
③ the calculation formula of the resistance:
in the formula: ρ is conductor resistivity;
l is conductor length;
s-conductor cross section;
the resistance of the cable conductor to be tested is obtained through measurement, and the sectional area of the cable conductor can be roughly calculated by adopting the resistivity specified by the standard and the nominal length of the cable.
The national standard has no limitation on the capacitance of the cable, but for high-voltage cables, the conductor is usually thick, the length is usually measured by a method of intercepting the short cable to measure the resistance, the resistance value of the short cable is usually very small, the measurement precision is difficult to guarantee, and intercepting the longer cable causes serious waste, so that the resistance method is not suitable. Because the high-voltage cable is provided with the shielding layer and the thickness of the insulating layer is uniform, the length of the cable can be checked by adopting a capacitance measurement method (the low-voltage cable is not provided with the shielding layer and is not suitable for a capacitance method). The capacitance measurement hardware principle is shown in fig. 7. The cable capacitance measuring device measures the capacitance of the cable, calculates the length of the cable by measuring the capacitance of the intercepted part of the cable and the longer cable, and compares the length with a nominal value.
Measuring the length of the medium-high voltage cable: the length of the cable is measured by the traveling wave measuring device and the time domain reflection method, so that the operation is simple and convenient, and the cable is not damaged. Different wave velocities are selected for calculating aiming at domestic cables with different specifications, the measurement is accurate, and the precision is superior to 1%;
measuring the length of the low-voltage cable: the cable resistance measuring device is used for measuring, intercepting small sections of cables, measuring the resistance quantity and the length, and performing equal ratio calculation with the resistance of the whole cable disc, so that the length of the cable can be accurately obtained; the precision is better than 0.5%.
High-precision measurement of conductor resistance: the resistance of the cable conductor can be measured with high precision, the precision is better than 0.2 percent, and the resistance of the conductor in unit length is calculated and compared with the national standard. Meanwhile, whether the sectional area of the cable conductor meets the standard requirement or not can be accurately judged.
Accurate measurement of the sectional area of the cable conductor: the current cross section measuring device is used for measuring, the photographing imaging technology is creatively used for directly measuring the cross section area of the conductor, the precision is better than 3%, and the operation is far simpler and more convenient than that of other methods;
accurate measurement of the length of the medium-high voltage cable: the cable capacitance measuring device is used for measuring, intercepting small sections of cables, accurately measuring the capacitance of the high-voltage cable, and performing geometric proportion calculation with the capacitance of the whole cable, so that the length of the cable can be accurately obtained, and the precision is better than 0.5%.
Claims (6)
1. The utility model provides a quick detection device of whole dish cable conductor quality, characterized by includes power adapter, industrial computer, cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device, and power adapter connects the industrial computer, and industrial computer signal connection cable resistance measuring device, cable cross section measuring device, cable capacitance measuring device, cable length measuring device.
2. The device for rapidly detecting the quality of the whole-disc cable conductor according to claim 1, wherein the cable resistance measuring device is composed of a cable resistance measuring single chip microcomputer, a power management module, a constant current source, two ADC conversion modules, a resistance measuring module and a four-wire output and isolation protection module, the power management module is connected with the cable resistance measuring single chip microcomputer and the constant current source and used for supplying power to the cable resistance measuring device, the constant current source is connected with a standard resistor, the standard resistor is connected with one ADC conversion module, and the ADC conversion module is connected with the cable resistance measuring single chip microcomputer; the resistance measurement module is connected with another ADC conversion module, the ADC conversion module is also connected with a cable resistance measurement single chip microcomputer, the standard resistance and the resistance measurement module are both connected with the four-wire output and isolation protection module, and the four-wire output and isolation protection module is connected with an output four-core interface for connecting a tested piece.
3. The device for rapidly detecting the quality of the whole-disc cable conductor as claimed in claim 1, wherein the cable section measuring device comprises a cable section measuring singlechip and a fixed-focus camera, the fixed-focus camera is connected with the cable section measuring singlechip, and the cable section measuring singlechip is connected with an industrial personal computer through a 232 communication interface.
4. The apparatus for rapidly detecting the quality of the conductor of the whole disc cable according to claim 1, wherein the cable capacitance measuring apparatus comprises a cable capacitance measuring single chip microcomputer, a power management module, a constant current source, a double arm bridge capacitance measuring module, a four-line output and isolation protection module, and an ADC conversion module, the cable capacitance measuring single chip microcomputer is provided with 232 communication interface, the 232 communication interface is connected with a USB to 232 module, the USB to 232 module is connected with an industrial personal computer USB, the power management module is connected with the constant current source and the cable capacitance measuring single chip microcomputer for supplying power, the constant current source is connected with the double arm bridge capacitance measuring module, the double arm bridge capacitance measuring module is connected with the four-line output and isolation protection module and the ADC conversion module, the four-line output and isolation protection module is connected with the tested piece, and the ADC conversion module is connected with the cable capacitance measuring single chip microcomputer.
5. The device for rapidly detecting the quality of the whole-disc cable conductor according to claim 1, wherein the cable length measuring device adopts a traveling wave measuring device and comprises a cable length measuring singlechip, a power management module, a high-voltage module, an impedance matching module, a relay triggering module and a data acquisition module, the cable length measuring singlechip is provided with a 232 communication interface, the 232 communication interface is connected with a USB-to-232 module, and the USB-to-232 module is connected with an industrial personal computer USB; the power management module is connected with the high-voltage module and the cable length measuring single chip microcomputer, the cable length measuring single chip microcomputer is connected with the relay trigger module, the relay trigger module is connected with the high-voltage module, the high-voltage module is connected with the impedance matching module, the impedance matching module is connected with the data acquisition module, and the data acquisition module is directly connected with the industrial personal computer.
6. The apparatus as claimed in claim 5, wherein the square wave source of the traveling wave measurement apparatus is added with a pre-processing loop and a post-processing loop for impedance adaptive matching, the high voltage module is connected with a 1M resistor in series and then connected with the pre-processing loop and a 50 Ω resistor, the pre-processing loop is connected with the charging voltage acquisition signal module, the 50 Ω resistor is connected with the trigger signal switch in series and then connected with the post-processing loop and the cable to be measured, and the post-processing loop is connected with the voltage waveform signal acquisition module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113390465A (en) * | 2021-07-02 | 2021-09-14 | 国网江西省电力有限公司电力科学研究院 | Device and method for rapidly detecting quality of whole-disc cable conductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113390465A (en) * | 2021-07-02 | 2021-09-14 | 国网江西省电力有限公司电力科学研究院 | Device and method for rapidly detecting quality of whole-disc cable conductor |
| CN113390465B (en) * | 2021-07-02 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Device and method for rapidly detecting quality of whole cable conductor |
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