Coiled cable tester and testing method

Abstract

The invention discloses a coiled cable tester, belongs to the technical field of cable detection, and solves the problems that cable testing equipment is single in function, and cable testing difficulty and complexity are increased. According to the technical scheme, the coiled cable tester mainly comprises a box body and a box cover, and the box body is provided with a testing host; the test host comprises a power supply module, a direct-current impedance test unit, a length measurement unit, a temperature measurement unit and a central processing unit, the direct-current impedance test unit is used for testing the direct-current impedance of a cable, the length measurement unit is used for measuring the length of the cable, the temperature measurement unit is used for measuring the temperature of the cable, and a control panel is arranged on the box body. The control panel is provided with a display screen, is electrically connected with the central processing unit, and receives and displays the detection result received by the central processing unit. According to the invention, integrated measurement of multiple parameters such as direct-current resistance, length, temperature and the like can be realized at the same time, and the test efficiency and precision are improved. The invention discloses a coiled cable testing method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable detection, and particularly relates to a disc cable tester and a testing method. BACKGROUND

[0002] In power equipment, the smoothness of wired communication and the delivery of power rely on the normal operation of cable lines. Once the line is obstructed, the communication and power will be interrupted, and if the fault cannot be found and eliminated in time, great economic losses and adverse social impacts will be caused. Therefore, a cable fault tester is an important tool for maintaining various cables. In actual cable detection work, the traditional detection method is inefficient and lacks accuracy, and it is difficult to meet the demand of large-scale and rapid testing. The existing cable testing equipment has a single function and cannot simultaneously realize the measurement of multiple parameters such as direct current resistance, length, cross-sectional area and the like, thereby increasing the difficulty and complexity of cable performance testing. Specifically, the existing equipment can usually only measure a single parameter, and multiple changes of testing equipment are needed to complete all testing items, which not only increases the testing time, but also easily causes testing errors due to the replacement of equipment. In addition, the traditional testing equipment lacks an integrated control panel and data processing unit, and the testing results need to be recorded and calculated manually, which further reduces the testing efficiency and accuracy. In terms of temperature testing, the existing equipment often needs to be additionally equipped with a temperature measuring instrument, thereby increasing the testing cost and operation complexity. SUMMARY

[0003] The present application aims to provide a disc cable tester and a testing method, solve the problem of single function of cable testing equipment and increase the difficulty and complexity of cable testing, and can simultaneously realize the integrated measurement of multiple parameters such as direct current resistance, length, temperature and the like, thereby improving the testing efficiency and accuracy.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a disc cable tester, comprising a box body and a box cover arranged on the box body, a testing host is arranged at the lower part of the box body, the testing host comprises a power module, a direct current impedance testing unit, a length measuring unit, a temperature testing unit and a central processing unit, the power module is electrically connected with the direct current impedance testing unit, the length measuring unit, the temperature testing unit and the central processing unit and provides electric energy, the direct current impedance testing unit is used for testing the direct current impedance of the cable, the length measuring unit is used for measuring the length of the cable, and the temperature testing unit is used for measuring the temperature of the cable, a control panel is arranged at the upper part of the box body, the control panel is provided with a display screen, and the control panel is electrically connected with the central processing unit, receives and displays the detection results received by the central processing unit.

[0005] Further, the control panel is provided with a plurality of function buttons corresponding to the DC impedance test unit, the length measurement unit and the temperature test unit, and the corresponding detection unit is started according to the detection function button.

[0006] Further, the control panel is provided with a power supply start button, and the power supply start button is pressed to control the on-off between the power supply module and the control panel.

[0007] Further, the control panel is provided with a test connection plug interface.

[0008] Further, the control panel is provided with a test connection plug interface.

[0009] Further, the control panel is provided with a test connection plug interface.

[0010] Further, the control panel is provided with a clock module for recording and displaying the current time.

[0011] Further, the control panel is provided with a test connection plug interface.

[0012] Further, the test host further comprises a WIFI communication module, and the WIFI communication module is wirelessly connected with the portable device to transmit data.

[0013] In order to achieve the above purpose, the application also adopts the following technical scheme: a disc cable test method, comprising the following steps: S01, open the box cover, start the power supply module to supply power to the control panel, and check the remaining power through the display screen; S02, insert the impedance test wire bundle into the plug interface, and the red and black clamps do not contact any object, and run the DC impedance test unit for zero calibration; S03, the impedance of the cable is tested by using the Kelvin four-wire method; S04, the electric length measurement special test line is electrically connected with the control panel, and the red clamp at the other end of the length measurement special line is clamped on the core of the cable, and the black clamp is clamped on the shielding layer outside the core of the cable, so that the core and the shielding layer are not short-circuited, and the nominal length and wave speed are input on the display screen to convert the length of the cable; S05, the cross-sectional area of the cable is calculated according to the impedance measured in step S04 and the length measured in step S05; S06, the probe of the temperature test unit is in contact with the disc cable to test the temperature of the cable.

[0014] From the above, the application provides a kind of disc cable tester and test method provided in the application, disc cable tester includes box body and box cover being arranged on box body, the lower part of box body is equipped with test host, test host includes power module, DC impedance test unit, length measuring unit, temperature test unit and central processing unit, by integrating multiple parameter measuring unit and central processing module, the integrated measurement of multiple parameters such as DC resistance, length, temperature can be realized simultaneously, with improve test efficiency and precision. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described below with reference to the drawings: Figure 1 It is a schematic view of the disc cable tester of the application; Figure 2 It is a schematic view of the test host in the application; Figure 3 It is a schematic view of the control panel of the application; Figure 4 It is a structural schematic view of the accommodating cavity in the application. DETAILED DESCRIPTION

[0016] To make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments.

[0017] The terms "first", "second" and the like (if any) in the specification and claims of the application are used to distinguish similar objects, not to describe a specific order or sequence, even if "second" is used before a certain technical feature to distinguish. It should be understood that in the application, "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. It should be understood that in the application, "multiple" means two or more. "And / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, X and / or Y can represent three cases: X alone, X and Y exist at the same time, and Y alone. The character " / " generally represents an "or" relationship between the associated objects before and after it. "Include X, Y and Z", "include X, Y, Z" means that X, Y and Z are included, "include X, Y or Z" means that one of X, Y and Z is included, and "include X, Y and / or Z" means that any one or any two or three of X, Y and Z is included.

[0018] The technical solutions of the present application are described in detail below with specific examples. The following specific examples can be combined or replaced according to actual conditions, and the same or similar concepts or processes may not be described in some examples.

[0019] As shown in Figure 1 , the present application provides a disc cable tester, which comprises a box body 1 and a box cover 2 arranged on the box body 1, and the lower part of the box body 1 is provided with a test host 3. As shown in Figure 2 , the test host 3 comprises a power module 31, a direct current impedance test unit 32, a length measurement unit 33, a temperature test unit 34 and a central processing unit 35. The power module 31 is electrically connected with the direct current impedance test unit 32, the length measurement unit 33, the temperature test unit 34 and the central processing unit 35 and provides electric energy. The direct current impedance test unit 32 is used for testing the direct current impedance of the cable, the length measurement unit 33 is used for measuring the length of the cable, and the temperature test unit 34 is used for measuring the temperature of the cable. Figure 3 As shown in , the upper part of the box body 1 is provided with a control panel 36, and the control panel 36 has a display screen 361. The control panel 36 is electrically connected with the central processing unit 35, receives and displays the detection results received by the central processing unit. Specifically, the inside of the box body 1 adopts a layered layout design. The lower test host 3 and the upper control panel 36 are connected through a wire harness. The power module 31 outputs multiple isolated power supplies which are respectively connected to each detection unit, so as to avoid the interference of a large current loop on a weak electric signal. The test host 3 refers to a hardware system integrated with multiple detection modules. Each functional circuit board is usually packaged in a metal shielding shell to realize electromagnetic interference isolation. The power module 31 refers to a multiple independent power supply system. Specifically, a switching power supply and a linear voltage stabilizer combination circuit can be used to provide stable working voltage for different detection units. The direct current impedance test unit 32 is used to measure the length of the cable. The control panel 36 which can realize man-machine interaction is arranged on the box body 1. Specifically, the control panel 36 adopts an industrial-grade touch screen integrated with operation buttons and a display area, which facilitates users to select functions when measuring the direct current impedance, length and temperature of the disc cable.

[0020] In the embodiment, the DC impedance testing unit 32 adopts a four-wire Kelvin bridge circuit to eliminate the influence of contact resistance; specifically, the DC impedance testing unit 32 is connected to the measured cable through four-wire terminals to eliminate the influence of the self-resistance of the testing line on the measurement accuracy, thereby improving the measurement accuracy of the DC impedance of the coiled cable. The length measuring unit 33 generates a high-frequency pulse signal to inject into the cable core, and calculates the conductor length through the time difference of reflected waves; specifically, the time domain reflectometry technology is used, that is, the cable length is calculated by measuring the propagation time of the electrical signal in the cable and the known wave speed. When the coiled cable measuring instrument measures the DC impedance and length of the cable, the control panel 36 can obtain the value of the cross-sectional area of the cable by operating the results of the DC impedance and length. The temperature testing unit 34 refers to a non-contact temperature measuring device, which can use an infrared sensor array to detect the temperature distribution on the surface of the cable. The infrared probe of the temperature testing unit 34 is installed on the side of the box body 1, and the thermal radiation data is obtained by aligning the surface of the cable during detection. After the control panel 36 receives the original data of each detection unit, it executes a temperature compensation algorithm to correct the resistance measurement value, and transmits the processing result to the display screen 361. The user can synchronously obtain the impedance, length and temperature parameters by observing the display screen 361 without switching the detection mode or connecting external equipment; thereby improving the measurement convenience of the cable and ensuring the accuracy of the measured and calculated data of the cable. Unlike the traditional cable detection which requires three independent devices, namely a resistance tester, a length measuring instrument and an infrared temperature gun, in the embodiment, the three functions are integrated into a single testing host 3, which reduces the influence of the replacement of the detection instrument on the detection efficiency during the detection process of the user.

[0021] In order to facilitate the user's function selection during measurement, such as Figure 3As shown, a plurality of function buttons are arranged on the control panel 36, which respectively correspond to the DC impedance test unit 32, the length test unit 33 and the temperature test unit 34, and the corresponding test unit is started by detecting the function button. Specifically, the plurality of function buttons can be impedance button, length button and temperature button. When the cable needs to be tested, the function is selected according to the DC impedance, length and temperature to be measured, and the DC impedance, length and temperature of the cable are tested. Specifically, the function button refers to a physical button with independent triggering function, which can be realized by mechanical contact switch or capacitive touch switch, and each button is configured to send a single instruction signal to the central processing unit 35. The corresponding relationship refers to the hard logic association between the function button and the test unit, which can be realized by pre-set circuit connection or embedded program coding. When a specific button is triggered, the central processing unit 35 only sends a start instruction to the corresponding test unit. Specifically, when the user connects the cable with the DC impedance function test interface, the user presses the DC impedance test function button, and the electrical signal generated by the button is transmitted to the central processing unit 35. The central processing unit 35 analyzes the signal and sends a start instruction to the DC impedance test unit 32. At this time, the length test unit 33 and the temperature test unit 34 remain in the inactive state. Similarly, when the length function button is triggered, the central processing unit 35 only starts the length test unit 33 and controls it to execute the cable length measurement program, and the remaining test units are in standby state. This one-to-one control mode is realized by hardware circuit isolation or software process independent allocation, which ensures that each test unit does not interfere with each other during operation.

[0022] In another embodiment, as Figure 3As shown, the control panel 36 is provided with a power start button 362, which is pressed to control the on-off connection between the power module 31 and the control panel 36. The power start button 362 is a mechanical press switch for triggering the on-off of the circuit, which can be implemented by a self-locking button or a momentary button. The button internal contact and the power supply line of the power module 31 are connected in series. The on-off control means that the power supply loop of the power module 31 to the control panel 36 is changed by the closing or opening state of the button contact. When the button is in the pressed state, the contact is turned on to power the control panel 36. After pressing again, the contact is separated to cut off the power supply. The power start button 362 is integrated in the operation area of the control panel 36. The operator can complete the circuit connection or disconnection between the power module 31 and the control panel 36 by a single pressing action. When the button is in the unpressed state, the power supply loop between the power module 31 and the control panel 36 is in a physical disconnected state. At this time, the display screen 361 and the function button of the control panel 36 are not supplied with electric energy, which prolongs the use time of the tester. When the button is pressed, the internal metal contact is in contact to form a closed loop. The electric energy is transmitted from the power module 31 to the control panel 36 to make it enter the working state. This design makes the power control function independent of other units of the test host 3, and only the on-off operation is performed on the control panel 36, avoiding the cumbersome steps of frequently opening the box body 1 or operating the external power switch. In the state of not needing to use, the power start button 362 can be closed to save power. The operator can quickly start and stop the power supply of the control panel 36 without interrupting the operation of the test host 3, reducing unnecessary operation time. At the same time, the independent on-off control mechanism between the power module 31 and the control panel 36 effectively avoids accidental power failure caused by accidental touch of other function buttons, ensuring the stability of the power supply of the host unit during the test process.

[0023] In another embodiment, as Figure 3As shown, in order to facilitate the connection of the cable with the DC impedance unit, the length measuring unit 33 and the temperature measuring unit, the control panel 36 is provided with a test cable plug-in interface; the test cable plug-in interface refers to a physical interface for connecting an external test cable; specifically, the plug-in interface has multiple, which are a DC impedance plug-in interface 363 connected with the DC impedance test cable, a length measuring plug-in interface 364 connected with the length measuring test cable and a temperature detection plug-in interface 365 connected with the temperature detection probe; the connection end of the test cable is in conduction with the circuit inside the control panel 36 through the plug-in interface, and the user can complete the quick access of the test cable without opening the box body 1, effectively improving the stability of the connection between the connection line of the test cable and the test unit, and avoiding the change of contact resistance caused by external force shaking. The quick access and stable connection of the test cable can be realized, and the time and steps required for wiring operation are reduced; the directional installation mode of the plug-in interface avoids the problem of cable winding, and the user can accurately complete the plug-in action; the stability of signal transmission can be maintained, and the possibility of test data error caused by poor contact is reduced.

[0024] Due to the detection of the cable, in some cases, it is necessary to carry the tester out for detection of the cable, in order to ensure the stability of power supply of the tester during use, as shown in Figure 1 , Figure 3 and Figure 4 , the box body 1 has a containing cavity 11 accommodating the power supply module 31, and the control panel 36 is provided with a charging port 367, and the power supply line extends into the containing cavity 11 from the charging port 367 to charge the power supply module 31; the containing cavity 11 can be integrally formed with the box body 1 by injection molding process, and the internal size matches the shape of the power supply module 31, and the power supply module 31 is fixed by buckling or screwing, so that the power supply module 31 is concentrated and stored, avoiding the dislocation of the charging interface caused by the scattering of parts. When charging is needed, the external power supply line is directly inserted into the containing cavity 11 through the charging port 367 and connected with the charging interface of the power supply module 31. During the charging process, the power supply line is limited inside the containing cavity 11, and the interference fit between the outer diameter of the power supply line and the charging port 367 prevents the cable from shaking or falling off. After charging is completed, the power supply line can be pulled out from the charging port 367 without disassembling the box body 1 or moving the power supply module 31. The structure realizes stable connection of the charging line through space constraint and physical isolation, avoiding poor contact caused by displacement of parts.

[0025] In the embodiment, the accommodating cavity 11 comprises a main accommodating cavity 111 and an auxiliary accommodating cavity 112, the power module 31 is arranged in the main accommodating cavity 111, and the auxiliary accommodating cavity 112 is provided with a reserve battery; the auxiliary accommodating cavity 112 is used for storing the reserve battery to provide backup power when the main power is exhausted; the reserve battery refers to an additional power storage unit independent of the main power module 31, and specifically can be implemented by a replaceable lithium battery pack, and is used for prolonging the continuous working time of the tester through a backup power switching mechanism; and the main accommodating cavity 111 and the auxiliary accommodating cavity 112 are physically isolated to avoid electromagnetic interference between the power module 31 and the reserve battery.

[0026] In another embodiment, the control panel 36 is provided with a clock module for recording and displaying the current time; the time recorded by the clock module and the current time displayed are displayed on the display screen 361 for the user to obtain information; when the tester performs the cable detection operation, the clock module generates accurate current time information based on a preset time reference. The central processing unit 35 binds and stores the test results such as temperature, impedance and length and the corresponding time stamp in the internal memory. When the user retrieves the historical detection data through the display screen 361, the time information and the test results are displayed synchronously. For example, after the cable cross-sectional area calculation is completed, the display screen 361 simultaneously displays the calculation result and the specific time when the detection is completed, without manual recording of the time node; the automatic recording of the cable test time and the data binding are realized, and the time sequence confusion or data misplacement problem caused by manual recording is avoided. The associated storage of the test results and the time information provides accurate time dimension support for subsequent data tracing, for example, when analyzing the cable performance change trend, the test data at different time points can be directly retrieved for comparison.

[0027] In order to ensure the convenience of updating the software on the central processing unit 35, as shown in Figure 3 The box body 1 is provided with a USB communication port 366, the central processing unit 35 and the USB communication port 366 are connected through a data line, the USB communication port 366 and the central processing unit 35 are connected through the data line, the software in the central processing unit 35 that needs to be updated is updated, and then the running efficiency of the disc cable tester is gradually improved, and then the test efficiency is improved.

[0028] In another embodiment, as shown in Figure 2As shown, the test host 3 also includes a WIFI communication module 37, which is wirelessly connected to the portable device to transmit data; the WIFI communication module 37 is connected to the central processing unit 35 through a wireless communication component of a protocol, and the data generated by the DC impedance test unit 32, the length measurement unit 33 and the temperature test unit 34 during the test is integrated by the central processing unit 35 and then transmitted to the portable device in real time through the WIFI communication module 37 in TCP / IP protocol. The user can view the cable impedance, length and temperature parameters on the mobile terminal, and store the data to the cloud or local database; the real-time wireless transmission of the detection data between the test host 3 and the mobile terminal is realized, the spatial constraints caused by the position limitation of the physical interface during the operation process are eliminated, the equipment failure risk caused by the data line winding is reduced, and the hardware support for the multi-terminal collaborative analysis of the cable parameters is provided.

[0029] In another embodiment, the present application provides a method for testing a coiled cable, comprising the following steps: S01, open the box cover 2, turn on the power module 31 to supply power to the control panel 36, and check the remaining power through the display screen 361; S02, insert the impedance measurement wire bundle into the plug-in interface, and the red and black clips do not contact any object, and run the DC impedance test unit 32 for zero calibration; S03, test the impedance of the cable by using the Kelvin four-wire method; S04, electrically connect the electric length measurement special test wire to the control panel 36, and clamp the red clip on one end of the special length measurement wire to the core of the cable and the black clip to the shielding layer outside the core of the cable, to ensure that the core and the shielding layer are not short-circuited, and input the nominal length and wave speed on the display screen 361 to convert the cable length; S05, calculate the cross-sectional area of the cable according to the impedance measured in step S04 and the length measured in step S05; S06, contact the probe of the temperature test unit 34 with the coiled cable to test the temperature of the cable.

[0030] The zeroing calibration refers to eliminating the influence of the resistance of the test harness itself on the measurement results by disconnecting the test harness from external objects, and the calibration program built in the direct current impedance test unit 32 can be used to automatically complete the calibration, so as to ensure the accuracy of the impedance measurement reference; the test process first starts the control panel 36 through the power module 31 and checks the power to ensure that the device has stable operating conditions. The Kelvin four-wire method refers to a measurement method for eliminating contact resistance errors through independent current application loops and voltage detection loops, and the four-wire test fixture can be used to realize the method, which can avoid the interference of the contact resistance of the test clamping point on the impedance measurement accuracy and avoid the attenuation of the voltage signal caused by the contact resistance of the clamping point, thereby improving the impedance measurement accuracy. In the length measurement step, the special test wire forms a closed loop through the clamping of the wire core and the shielding layer, and the length of the cable is automatically calculated by using the electromagnetic wave reflection principle combined with the input wave speed parameter, without the need for segmented measurement or manual calculation. The cable cross-sectional area calculation refers to using the physical relationship between the conductor direct current resistance, length and material resistivity to deduce the cross-sectional area value; the automatic association of the impedance and length data by the central processing unit 35 can directly output the results according to the physical formula, eliminating the errors that may be caused by the traditional manual table lookup or step-by-step calculation. The temperature test probe refers to a contact type thermal sensor for directly measuring the surface temperature of the cable, and the temperature test unit 34 can be used to tightly attach the probe to the surface of the cable and read the thermal conduction data to realize real-time acquisition of the temperature parameter and form a complete set of performance parameters.

[0031] In addition to the preferred embodiments described above, the present application also has other embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of the present application.

Claims

1. A disc cable tester comprising a box body and a box cover arranged on the box body, a lower part of the box body being provided with a test host, characterized in that, The test host comprises a power module, a direct current impedance test unit, a length measuring unit, a temperature test unit and a central processing unit, the power module is electrically connected with the direct current impedance test unit, the length measuring unit, the temperature test unit and the central processing unit and provides electric energy, the direct current impedance test unit is used for testing the direct current impedance of the cable, the length measuring unit is used for measuring the length of the cable, and the temperature test unit is used for measuring the temperature of the cable, the upper portion of the box body is provided with a control panel, the control panel is provided with a display screen, and the control panel is electrically connected with the central processing unit, receives and displays the detection result received by the central processing unit.

2. The disked cable tester of claim 1, wherein, The control panel is also provided with a plurality of function buttons corresponding to the direct current impedance test unit, the length measuring unit and the temperature test unit, and the corresponding detection unit is started according to the detection function button.

3. The disked cable tester of claim 1, wherein, The control panel is provided with a power start button, and the power start button is pressed to control the on-off between the power module and the control panel.

4. The disked cable tester of claim 1, wherein, The control panel is provided with a test wiring plug interface.

5. The disked cable tester of claim 1, wherein, The box body is provided with a containing cavity for containing the power module, and the control panel is provided with a charging port, and the power line extends into the containing cavity from the charging port to charge the power module.

6. The disked cable tester of claim 5, wherein, The containing cavity comprises a main containing cavity and an auxiliary containing cavity, the power module is arranged in the main containing cavity, and a reserve battery is arranged in the auxiliary containing cavity.

7. The disked cable tester of claim 1, wherein, The control panel is provided with a clock module for recording and displaying the current time.

8. The disked cable tester of claim 1, wherein, The box body is provided with a USB communication port, and the central processing unit is connected with the USB communication port through a data line.

9. The disked cable tester of claim 1, wherein, The test host further comprises a WIFI communication module, and the WIFI communication module is wirelessly connected with a portable device to transmit data.

10. A method of testing a coiled cable using a coiled cable tester as claimed in any one of claims 1 to 9, wherein, Characterized in that, The method comprises the following steps: S01, opening the box cover, starting the power module to supply power to the control panel, and checking the remaining power through the display screen; S02, inserting the impedance measuring wire bundle into the plug interface, and the red and black clamps do not contact any object, and the direct current impedance test unit is run for zero calibration; S03, the impedance of the cable is tested by using the Kelvin four-wire method; S04, the electric length measuring special test wire is electrically connected with the control panel, the red clamp at the other end of the length measuring special wire is clamped on the core of the cable, the black clamp is clamped on the shielding layer outside the core of the cable, it is ensured that the core and the shielding layer are not short-circuited, and the nominal length and the wave speed are input on the display screen to convert the length of the cable; S05, the cross-sectional area of the cable is calculated according to the impedance measured in step S04 and the length measured in step S05; S06, the probe of the temperature test unit contacts the coiled cable to test the temperature of the cable.

Images