CN210534238U - Wire and cable unit length direct current resistance measuring device - Google Patents
Wire and cable unit length direct current resistance measuring device Download PDFInfo
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- CN210534238U CN210534238U CN201921448596.6U CN201921448596U CN210534238U CN 210534238 U CN210534238 U CN 210534238U CN 201921448596 U CN201921448596 U CN 201921448596U CN 210534238 U CN210534238 U CN 210534238U
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 71
- 229910052802 copper Inorganic materials 0.000 claims abstract description 70
- 239000010949 copper Substances 0.000 claims abstract description 70
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000003993 interaction Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 10
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract 2
- 238000000691 measurement method Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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Abstract
A device for measuring the direct current resistance of a wire and cable in unit length relates to the technical field of wire and cable detection. The measuring device mainly comprises a device structure unit and a measuring module unit, wherein the device structure unit comprises a wire and cable to be measured, a first copper buckle, a first copper connecting lead, a resistor, a second copper connecting lead, an electronic switch and the like; the measuring module unit comprises a temperature measuring module, a signal amplifying module, an A/D conversion module, a single chip microcomputer and a liquid crystal display module which are sequentially and electrically connected, and the single chip microcomputer receives a control signal input by the man-machine interaction module and controls the action of an electronic switch. The utility model discloses the simple and easy feasible and harmless cable of cable length measurement method that adopts can perfectly replace cable length detection method that present lossy, work efficiency are low. By solving the problem of measuring the length of the wire and the cable, the measurement of the direct current resistance of the wire and the cable in unit length becomes simpler and quicker.
Description
Technical Field
The utility model relates to a wire and cable detects technical field, specifically is to relate to a wire and cable unit length direct current resistance measuring device.
Background
There are clear regulations in relevant national standards: the direct current resistance of the electric wire and the cable needs to take the conductor resistance per kilometer as a reference for comparison, and the measured direct current resistance data of the electric wire and the cable needs to be converted into a direct current resistance value per kilometer at the temperature of 20 ℃. And (3) converting the measured direct current resistance value into a direct current resistance value under the condition of 20 ℃, and if the value is smaller than a specified standard value, determining that the wire and cable sample is a qualified product, otherwise, determining that the wire and cable sample is an unqualified product.
In fact, if the length of the wire or cable is known, it is not difficult to measure the direct current resistance per unit length of the wire or cable. However, at present, the quality of electric wires and cables in China is not uniform, and manufacturers generally have the problem of virtual marks of the lengths of the electric wires and cables, so that the difficulty of measuring the direct current resistance of the electric wires and cables in unit length is to measure the lengths of the electric wires and cables, and if the electric wires and cables are packaged in a quantitative specification or stored in a cable roller, the difficulty of measuring the lengths of the electric wires and cables is very high. After the length of the electric wire and the electric cable is accurately measured, the direct current resistance of the electric wire and the electric cable is measured, the direct current resistance of the electric wire and the electric cable in unit length can be easily obtained, and the resistance is converted into the direct current resistance value of each kilometer at the temperature of 20 ℃, so that whether the direct current resistance of the electric wire and the electric cable is qualified or not can be detected.
In the current market, counterfeit and shoddy products are serious, the phenomenon of weight shortage and short time is very common, and the shortage of the cable length is also a prominent problem. However, the length of the cable to be measured needs to be measured, which is not only tedious, but also affected by the field, environment and human error of operators, and meanwhile, the insulation appearance of the cable is damaged by irreparable damage, which causes economic loss for enterprises and users.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an electric wire and cable unit length direct current resistance measuring device, measuring device simple structure, measuring method is simple and convenient, swift, and the degree of accuracy is high.
In order to realize the above purpose, the utility model discloses the technical scheme who adopts is:
a device for measuring the direct current resistance of a wire and cable in unit length mainly comprises a device structure unit and a measuring module unit, wherein the device structure unit mainly comprises a wire and cable to be measured, a first copper buckle, a first copper connecting lead, a resistor, a second copper connecting lead, an electronic switch, a third copper connecting lead, a direct current power supply, a fourth copper connecting lead and a second copper buckle;
one end of the first copper connecting wire is connected to the first copper buckle through a binding post, the other end of the first copper connecting wire is connected to one end of the resistor through the binding post, one end of the second copper connecting wire is connected to the other end of the resistor through the binding post, and the other end of the second copper connecting wire is connected to one end of the electronic switch through the binding post; one end of a third copper connecting wire is connected to the other end of the electronic switch through a binding post, and the other end of the third copper connecting wire is connected to one end of a direct-current power supply through the binding post; one end of a fourth copper connecting wire is connected to the other end of the direct-current power supply through a binding post, and the other end of the fourth copper connecting wire is connected to the second copper buckle through the binding post;
the measurement module unit mainly comprises a temperature measurement module, a signal amplification module, an A/D conversion module, a single chip microcomputer and a liquid crystal display module which are sequentially and electrically connected, wherein the single chip microcomputer receives a control signal input by the man-machine interaction module and controls the action of an electronic switch;
the method comprises the steps of firstly measuring the length l of the electric wire and the electric cable by using an electric wire and electric cable length measuring device, and then measuring the resistance R of the electric wire and the electric cable, wherein the direct current resistance of the electric wire and the electric cable in unit length can be calculated by a formula (R/l).
In the direct current resistance measuring device for the unit length of the electric wire and the electric cable, the electric wire and the electric cable to be measured, the length of which needs to be measured, can be placed in any mode.
In the direct current resistance measuring device for the unit length of the electric wire and the cable, the two copper buckles are copper buckles with clamping devices and are used for tightly connecting the two copper connecting wires with the electric wire and the cable to be measured.
The utility model discloses a wire and cable unit length direct current resistance measuring device, its beneficial effect shows:
the adopted cable length measuring method is simple and feasible, does not damage the cable, and can perfectly replace the existing cable length measuring method with loss and low working efficiency. By solving the problem of measuring the length of the wire and the cable, the measurement of the direct current resistance of the wire and the cable in unit length becomes simpler and quicker. Meanwhile, the length measuring device is simple in overall structure, low in manufacturing cost and suitable for being widely popularized.
Drawings
The following detailed description will be made on the device for measuring the dc resistance per unit length of the electric wire according to the present invention with reference to the following embodiments and accompanying drawings.
Fig. 1 is a schematic view of the structural unit of the wire and cable length measuring device.
Fig. 2 is an electrical schematic diagram of a measuring module unit of the wire and cable length measuring apparatus.
Detailed Description
In order to measure wire and cable's unit length direct current resistance, the utility model discloses at first utilize wire and cable length measuring device to measure wire and cable's length l, then measure wire and cable's resistance R through current very mature principle and device, wire and cable's unit length direct current resistance can be calculated through formula (R/l) so and get.
The wire and cable length measuring device is divided into two units, namely a device structure unit and a measuring module unit. Referring to fig. 1, the device structure unit mainly includes a to-be-tested wire cable 101, a first copper latch 102, a first copper connecting wire 103, a resistor 104, a second copper connecting wire 105, an electronic switch 109, a third copper connecting wire 106, a dc power supply 108, a fourth copper connecting wire 107, and a second copper latch 111.
The wire and cable 101 to be measured, the length of which needs to be measured, is drawn straight in the drawing, but it is just an expression that the wire and cable to be measured may be either bent or in a form used in a coil. No matter what kind of form of placing, utilize the utility model relates to a length measuring device measures this wire and cable's length does not have any influence.
The two copper buckles 102 and 111 are copper buckles with clamping devices and are used for tightly connecting the first copper connecting lead 103 and the fourth copper connecting lead 107 with the electric wire 101 to be measured.
First copper connecting wire 103 one end passes through the terminal connection on first copper buckle 102, and the other end passes through the terminal connection in resistance 104 one end, and second copper connecting wire 105 one end passes through the terminal connection in the resistance 104 other end, and the other end passes through the terminal connection in electronic switch 109 one end. One end of a third copper connecting wire 106 is connected to the other end of the electronic switch 109 through a binding post, and the other end is connected to one end of a direct current power supply 108 through a binding post; one end of the fourth copper connecting wire 107 is connected to the other end of the dc power supply 108 via a terminal, and the other end is connected to the second copper latch 111 via a terminal.
As shown in fig. 2, the measuring module unit of the wire and cable length measuring device mainly includes a temperature measuring module 201, a signal amplifying module 202, an a/D conversion module 203, a single chip 204, and a liquid crystal display module 205, which are electrically connected in sequence, and meanwhile, the single chip 204 receives a control signal input by a human-computer interaction module 206 and controls the electronic switch 109 to operate. In addition, the power module provides power supply for each component of the measuring module unit.
The following description focuses on the usage, procedure and operation principle of the wire and cable length measuring device. Before testing, preparation work is done. Firstly, a first copper buckle 102 and a second copper buckle 111 with clamping devices are firmly clamped at two ends of a wire cable 101 to be tested; two ends of a first copper connecting wire 103 are respectively connected to the first copper buckle 102 and one end of a resistor 104 through binding posts; two ends of a second copper connecting wire 105 are respectively connected with the other end of the resistor 104 and one end of the electronic switch 109 through binding posts; two ends of a third copper connecting wire 106 are respectively connected with the other end of the electronic switch 109 and the direct current power supply 108 through binding posts; both ends of the fourth copper connecting wire 107 are connected to the dc power supply 108 and the second copper clip 111 through terminals, respectively.
After the connection is completed, the temperature probe of the temperature measurement module 201 is placed on the resistor 104 to sensitively measure the temperature change, and then the dc power supply 108 is turned on. Then, the power module of the measuring module unit of the wire and cable length measuring device is started, the man-machine interaction module 206 is operated to enable the single chip microcomputer 204 (an STC89C52RC single chip microcomputer can be adopted) to be in a temperature calibration function, and the environment temperature T measured by the temperature measuring module 201 is recorded as 'reference zero' in the single chip microcomputer. Then, the man-machine interaction module 206 is operated to enable the singlechip 204 to be in a length measurement function, the singlechip 204 firstly controls the electronic switch 109 to be closed, the closing time of the electronic switch 109 can be measured in advance and is recorded as time t1Will t1Recording in a memory of the singlechip; when the electronic switch 109 is closed, the current reaches the resistor 104 after a period of time, the temperature of the resistor rises rapidly, and the time when the temperature of the resistor 104 rises to (T +0.2) ° C is recorded by the singlechip as time T2. The propagation speed of heat in specific metal is a fixed value, and the propagation speed of the heat in the wire and cable to be tested is recorded as v1The propagation velocity in the copper wire is v2. The lengths of the first copper connecting lead 103, the second copper connecting lead 105, the third copper connecting lead 106 and the fourth copper connecting lead 107 can be measured in advance before the measurement, and are respectively marked as l1、l2、l3And l4Then the time taken for the heat to propagate in these auxiliary conductors is ((l)1+l2+l3+l4)/v2). Assuming that the length of the electric wire 101 to be measured is l, the length l of the electric wire to be measured is (v)1(t2-t1-((l1+l2+l3+l4)/v2)))。
In addition, in order to reduce errors, the second copper connecting wires 105 with various lengths can be replaced for testing, the length difference among the various lengths is selected to be larger, then the measurement is carried out for multiple times, and the average value is obtained, so that the measurement errors can be greatly reduced.
After the length l of the wire and cable to be measured is accurately measured by the measuring method, the direct current resistance R of the wire and cable to be measured is measured by utilizing the existing mature direct current resistance measuring device (a device manufactured by utilizing the principles such as an electric bridge method, a four-wire method, a feeder resistance compensation method and the like), then the direct current resistance value of each kilometer of the wire and cable can be calculated by using a formula (R/l), the measured environmental temperature is T, the direct current resistance of the unit length of the wire and cable is converted into the direct current resistance value under the condition of 20 ℃, and whether the wire and cable is qualified or not can be judged by comparing with the related standard.
The foregoing is merely exemplary and illustrative of the principles of the present invention, and various modifications, additions and substitutions as may be made to the specific embodiments described herein by those skilled in the art are intended without departing from the spirit and scope of the invention as defined in the accompanying claims.
Claims (4)
1. The utility model provides a wire and cable unit length direct current resistance measuring device which characterized in that: the device mainly comprises a device structure unit and a measurement module unit, wherein the device structure unit mainly comprises a wire and cable to be measured, a first copper buckle, a first copper connecting lead, a resistor, a second copper connecting lead, an electronic switch, a third copper connecting lead, a direct-current power supply, a fourth copper connecting lead and a second copper buckle;
one end of the first copper connecting wire is connected to the first copper buckle through a binding post, the other end of the first copper connecting wire is connected to one end of the resistor through the binding post, one end of the second copper connecting wire is connected to the other end of the resistor through the binding post, and the other end of the second copper connecting wire is connected to one end of the electronic switch through the binding post; one end of a third copper connecting wire is connected to the other end of the electronic switch through a binding post, and the other end of the third copper connecting wire is connected to one end of a direct-current power supply through the binding post; one end of a fourth copper connecting wire is connected to the other end of the direct-current power supply through a binding post, and the other end of the fourth copper connecting wire is connected to the second copper buckle through the binding post;
the measurement module unit mainly comprises a temperature measurement module, a signal amplification module, an A/D conversion module, a single chip microcomputer and a liquid crystal display module which are sequentially and electrically connected, wherein the single chip microcomputer receives a control signal input by the man-machine interaction module and controls the action of an electronic switch;
the method comprises the steps of firstly measuring the length l of the electric wire and the electric cable by using an electric wire and electric cable length measuring device, and then measuring the resistance R of the electric wire and the electric cable, wherein the direct current resistance of the electric wire and the electric cable in unit length can be calculated by a formula (R/l).
2. The apparatus for measuring direct current resistance per unit length of electric wire according to claim 1, wherein: the wire and cable to be measured, the length of which needs to be measured, can adopt any placement form.
3. The apparatus for measuring direct current resistance per unit length of electric wire according to claim 1, wherein: the two copper buckles are copper buckles with clamping devices and are used for tightly connecting the two copper connecting wires with the wire cable to be tested.
4. The apparatus for measuring the direct current resistance per unit length of electric wire according to claim 1, wherein after the length and the resistance of the electric wire to be measured are measured, respectively, the direct current resistance per kilometer of the electric wire at the ambient temperature T is calculated by using a formula (R/l), and then the direct current resistance per unit length is converted into a direct current resistance value at 20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921448596.6U CN210534238U (en) | 2019-08-30 | 2019-08-30 | Wire and cable unit length direct current resistance measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921448596.6U CN210534238U (en) | 2019-08-30 | 2019-08-30 | Wire and cable unit length direct current resistance measuring device |
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| CN210534238U true CN210534238U (en) | 2020-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412354A (en) * | 2019-08-30 | 2019-11-05 | 国网安徽省电力有限公司培训中心 | A kind of flat wire cable length direct current resistance m easurem ent device and measurement method |
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2019
- 2019-08-30 CN CN201921448596.6U patent/CN210534238U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412354A (en) * | 2019-08-30 | 2019-11-05 | 国网安徽省电力有限公司培训中心 | A kind of flat wire cable length direct current resistance m easurem ent device and measurement method |
| CN110412354B (en) * | 2019-08-30 | 2024-05-07 | 国网安徽省电力有限公司培训中心 | Device and method for measuring direct current resistance of unit length of wire and cable |
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