Cable length tester for power grid construction

Abstract

The invention discloses a cable length tester for power grid construction. The cable length tester comprises a shell, at least two cable access ends; the measurement control unit is used for calculating and determining a length measurement value of the to-be-measured cable based on the capacitance parameter and / or the resistance parameter; the display unit is connected with the measurement control unit and is used for displaying a measurement result; and the power supply unit is used for supplying power to the cable length tester. The device has the advantages that the interior is highly integrated, the external operation button is simple and convenient, the operation is fast, and the measurement information can be intelligently displayed; through an impedance or capacitive reactance mode, a special algorithm is used for conversion, and cable length data is rapidly and accurately obtained; manual measurement is not needed, accurate cable length data are obtained, the workload is reduced, and material loss and waste caused by manual misoperation are prevented; the system is high in intelligent degree, convenient to operate, clear in display category, small in overall size and convenient to carry.

Description

Technical Field

[0001] This invention relates to the field of power grid construction technology, and in particular to cable length testing equipment. Background Technology

[0002] With the acceleration of new urbanization and the continuous upgrading of smart grids, the laying of underground cables, the layout of substations and distribution plants, and routine maintenance have become routine tasks for power grid operation and maintenance. As the core carrier of power transmission and signal connection, the precise control of cable length is a key link in ensuring construction quality. If the cable length is too long, it will not only lead to redundant accumulation of cables in the pipeline, occupying limited pipeline space, but also increase obstacles for later inspection and maintenance, and may even cause safety hazards due to cable entanglement; if the cable length is too short, new cables need to be cut and spliced, which will directly interrupt the current construction process and may also reduce the stability of the power supply line due to the additional joints, posing a potential threat to the safe operation of the regional power grid.

[0003] Currently, the industry still largely relies on traditional manual measuring tape operation for cable length measurement and cutting. This method is not only inefficient, but also requires multiple people to work together to complete the measurement in complex environments such as narrow, damp underground pipes and densely packed equipment in plants, significantly increasing manpower and workload. Furthermore, it is susceptible to errors due to multiple factors. On the one hand, there are differences in personnel skill levels and operational standards, leading to inconsistent criteria for judging "allowed length." On the other hand, dim lighting can cause reading deviations, and strong electromagnetic interference can disrupt tool stability, ultimately resulting in frequent incorrect or missed cuts. This not only directly wastes high-specification power cables and other raw materials, but also disrupts the overall construction plan due to rework and material replenishment, severely slowing down project progress.

[0004] Therefore, there is an urgent need to research a tool that can quickly measure cable length to reduce workload, improve work efficiency, and reduce material waste. Summary of the Invention

[0005] The purpose of this invention is to provide a cable length tester for power grid construction, so as to solve the problems of existing cable length measurement technology, such as large workload, low work efficiency, and easy error leading to material waste and affecting construction progress.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A cable length tester for power grid construction includes:

[0008] shell;

[0009] At least two cable connectors are required to connect the cable to be tested.

[0010] A measurement control unit, disposed within the housing, is configured to measure the capacitance and / or resistance parameters of the cable under test via the cable access terminal, and calculate and determine the length measurement value of the cable under test based on the capacitance and / or resistance parameters.

[0011] The display unit, connected to the measurement and control unit, is used to display the measurement results;

[0012] A power supply unit is used to power the cable length tester.

[0013] Furthermore, the measurement control unit is configured as follows:

[0014] The capacitance and resistance parameters of the cable under test are measured through the cable access terminal.

[0015] Based on the capacitance and resistance values ​​per unit length of a cable of a preset standard length, the first length value and the second length value are calculated according to the capacitance and resistance parameters, respectively.

[0016] The length measurement value of the cable under test is calculated and determined based on the first length value and the second length value.

[0017] Furthermore, the length measurement of the cable under test is determined by the average of the first length value and the second length value.

[0018] Furthermore, the display unit is configured as a touch screen, and the measurement control unit is also configured to: before performing length measurement, measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of known length based on the calibration command input by the user from the touch screen;

[0019] Alternatively, the display unit may be configured as a display screen and an operation panel, and the measurement control unit may also be configured to: before performing length measurement, measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of known length based on the calibration command input by the user from the operation panel.

[0020] Furthermore, the measurement control unit is specifically configured to perform the following operations to obtain the capacitance parameters:

[0021] Connect the at least two cable access terminals to the two ends of the cable under test respectively, and measure the total capacitance value of the cable under test as the capacitance parameter.

[0022] Furthermore, the measurement control unit is specifically configured to perform the following operations to obtain the resistance parameters:

[0023] At least two conductors at one end of the cable under test are short-circuited, and then the short-circuited end and the corresponding conductors at the other end of the cable are respectively connected to the at least two cable access terminals. The loop resistance value of the cable under test is measured and used as the resistance parameter.

[0024] Furthermore, the power supply unit includes a rechargeable battery, and the outer casing is provided with an external charging interface electrically connected to the rechargeable battery.

[0025] Furthermore, the cable connector is covered with an insulating cap. The insulating cap can be made of rubber or other insulating materials.

[0026] Furthermore, the measurement and control unit is configured as an integrated circuit board, which integrates a capacitive reactance detection circuit and an impedance detection circuit, and the surface of the circuit board is provided with an anti-corrosion and waterproof coating.

[0027] Furthermore, the outer casing is configured as a closed, waterproof structure.

[0028] The outer shell is made of a corrosion-resistant material.

[0029] The material of the outer shell can be selected from polypropylene, polyethylene, polyvinyl chloride, modified ABS, polycarbonate, polyoxymethylene, polytetrafluoroethylene, nylon, polyetheretherketone, stainless steel, aluminum alloy, titanium alloy, brass, fiberglass, carbon fiber composite material, or other materials that take into account chemical resistance, structural strength, processability, and electrical insulation.

[0030] The advantages of this invention are:

[0031] 1) This invention features high internal integration, simple external operation buttons, easy learning curve, and intelligent display of measurement information;

[0032] 2) This invention, by setting at least two cable access terminals and a measurement control unit, can quickly and accurately obtain the length measurement value of the cable under test;

[0033] 3) No need for manual measurement of the entire cable, reducing workload and preventing material loss and waste caused by human error;

[0034] 4) It is highly intelligent, easy to operate, displays clear categories, and is compact and portable. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, do not constitute an undue limitation of the invention. In the drawings:

[0036] Figure 1 This is a schematic diagram of the external structure of the cable length tester;

[0037] Figure 2 This is a schematic diagram of the internal structure of a cable length tester.

[0038] 1. Housing, 2. Display screen, 3. Operation panel, 4. Measurement and control unit, 5. Rechargeable battery, 6. Cable connector. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0040] Example 1

[0041] like Figures 1-2 As shown, this embodiment provides a cable length tester for power grid construction, including:

[0042] The outer shell 1 is made of a corrosion-resistant material, such as polypropylene;

[0043] Two cable input terminals 6 are used to connect the cable to be tested;

[0044] The measurement control unit 4 is disposed inside the housing 1 and is configured to measure the capacitance and / or resistance parameters of the cable under test through the cable access terminal 6, and calculate and determine the length measurement value of the cable under test based on the capacitance and / or resistance parameters.

[0045] The display unit, connected to the measurement control unit 4, is used to display the measurement results;

[0046] A power supply unit is used to power the cable length tester.

[0047] The measurement and control unit 4 is configured as follows:

[0048] The capacitance and resistance parameters of the cable under test are measured through the cable access terminal 6.

[0049] Based on the capacitance and resistance values ​​per unit length of a cable of a preset standard length, the first length value and the second length value are calculated according to the capacitance and resistance parameters, respectively.

[0050] The length measurement value of the cable under test is calculated and determined based on the first length value and the second length value.

[0051] The length of the cable under test is determined by the average of the first length value and the second length value.

[0052] The display unit is configured as a display screen 2 and an operation panel 3. The measurement control unit 4 is further configured to: before performing length measurement, measure and store the unit length capacitance value and the unit length resistance value using a standard cable of known length based on the calibration command input by the user from the operation panel 3.

[0053] The measurement and control unit 4 is specifically configured to perform the following operations to obtain the capacitance parameters:

[0054] Connect the at least two cable access terminals 6 to the two ends of the cable under test respectively, and measure the total capacitance value of the cable under test as the capacitance parameter.

[0055] The measurement and control unit 4 is specifically configured to perform the following operations to obtain the resistance parameters:

[0056] At least two conductors at one end of the cable under test are short-circuited, and the corresponding conductors at the short-circuited end and the other end of the cable are respectively connected to the at least two cable access terminals 6. The loop resistance value of the cable under test is measured and used as the resistance parameter.

[0057] The power supply unit includes a rechargeable battery 5, and the outer casing 1 is provided with an external charging interface that is electrically connected to the rechargeable battery 5.

[0058] The measurement and control unit 4 is configured as an integrated circuit board, which integrates capacitive reactance detection circuit and impedance detection circuit.

[0059] Before testing, the above-mentioned tester is first calibrated using a standard length cable to determine the capacitance per unit length. and resistance per unit length During testing, the rubber caps on both cable connectors (6) were removed and connected to the two ends of the cable under test. The total capacitance C of the cable was measured using the formula: The cable length was measured. .

[0060] Then, short-circuit the two single-core wires at one end of the cable, and connect the other ends of the two single-core wires to the two cable input terminals 6 respectively. Measure the cable resistance R using the formula: The cable length was measured. .

[0061] Finally, the command is input on the display unit and processed by the fusion algorithm: The actual length L of the cable was measured.

[0062] Example 2

[0063] like Figures 1-2 As shown, this embodiment provides a cable length tester for power grid construction, including:

[0064] The outer shell 1 is made of a corrosion-resistant material, such as polyethylene;

[0065] Two cable input terminals 6 are used to connect the cable to be tested;

[0066] The measurement control unit 4 is disposed inside the housing 1 and is configured to measure the capacitance and / or resistance parameters of the cable under test through the cable access terminal 6, and calculate and determine the length measurement value of the cable under test based on the capacitance and / or resistance parameters.

[0067] The display unit, connected to the measurement control unit 4, is used to display the measurement results;

[0068] A power supply unit is used to power the cable length tester.

[0069] The measurement and control unit 4 is configured as follows:

[0070] The capacitance and resistance parameters of the cable under test are measured through the cable access terminal 6.

[0071] Based on the capacitance and resistance values ​​per unit length of a cable of a preset standard length, the first length value and the second length value are calculated according to the capacitance and resistance parameters, respectively.

[0072] The length measurement value of the cable under test is calculated and determined based on the first length value and the second length value.

[0073] The length of the cable under test is determined by the average of the first length value and the second length value.

[0074] The display unit is configured as a display screen 2 and an operation panel 3. The measurement control unit 4 is further configured to: before performing length measurement, measure and store the unit length capacitance value and the unit length resistance value using a standard cable of known length based on the calibration command input by the user from the operation panel 3.

[0075] The measurement and control unit 4 is specifically configured to perform the following operations to obtain the capacitance parameters:

[0076] Connect the at least two cable access terminals 6 to the two ends of the cable under test respectively, and measure the total capacitance value of the cable under test as the capacitance parameter.

[0077] The measurement and control unit 4 is specifically configured to perform the following operations to obtain the resistance parameters:

[0078] At least two conductors at one end of the cable under test are short-circuited, and the corresponding conductors at the short-circuited end and the other end of the cable are respectively connected to the at least two cable access terminals 6. The loop resistance value of the cable under test is measured and used as the resistance parameter.

[0079] The power supply unit includes a rechargeable battery 5, and the outer casing 1 is provided with an external charging interface that is electrically connected to the rechargeable battery 5.

[0080] When the cable connector 6 is not in operation, it is covered with a rubber cap to prevent wear. The insulating cap can be made of rubber or other insulating materials.

[0081] The measurement and control unit 4 is configured as an integrated circuit board, which integrates a capacitive reactance detection circuit and an impedance detection circuit, and the surface of the circuit board is provided with an anti-corrosion and waterproof coating.

[0082] The outer casing 1 is configured as a closed, waterproof structure.

[0083] Before testing, the above-mentioned tester is first calibrated using a standard length cable to determine the capacitance per unit length. and resistance per unit length During testing, the rubber caps on both cable connectors (6) were removed and connected to the two ends of the cable under test. The total capacitance C of the cable was measured using the formula: The cable length was measured. .

[0084] Then, short-circuit the two single-core wires at one end of the cable, and connect the other ends of the two single-core wires to the two cable input terminals 6 respectively. Measure the cable resistance R using the formula: The cable length was measured. .

[0085] Finally, the command is input on the display unit and processed by the fusion algorithm: The actual length L of the cable was measured.

[0086] Example 3

[0087] This embodiment provides a cable length tester for power grid construction, including:

[0088] The outer shell is made of corrosion-resistant materials, such as polypropylene;

[0089] Two cable connectors are used to connect the cable to be tested;

[0090] A measurement control unit, disposed within the housing, is configured to measure the capacitance and / or resistance parameters of the cable under test via the cable access terminal, and calculate and determine the length measurement value of the cable under test based on the capacitance and / or resistance parameters.

[0091] The display unit, connected to the measurement and control unit, is used to display the measurement results;

[0092] A power supply unit is used to power the cable length tester.

[0093] The measurement and control unit is configured to:

[0094] The capacitance and resistance parameters of the cable under test are measured through the cable access terminal.

[0095] Based on the capacitance and resistance values ​​per unit length of a cable of a preset standard length, the first length value and the second length value are calculated according to the capacitance and resistance parameters, respectively.

[0096] The length measurement value of the cable under test is calculated and determined based on the first length value and the second length value.

[0097] The length of the cable under test is determined by the average of the first length value and the second length value.

[0098] The display unit is configured as a touch screen, and the measurement control unit is further configured to: before performing length measurement, measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of known length based on the calibration command input by the user from the touch screen, and display the measurement information and tester status information in real time.

[0099] The measurement and control unit is specifically configured to perform the following operations to obtain the capacitance parameters:

[0100] Connect the at least two cable access terminals to the two ends of the cable under test respectively, and measure the total capacitance value of the cable under test as the capacitance parameter.

[0101] The measurement and control unit is specifically configured to perform the following operations to obtain the resistance parameters:

[0102] At least two conductors at one end of the cable under test are short-circuited, and then the short-circuited end and the corresponding conductors at the other end of the cable are respectively connected to the at least two cable access terminals. The loop resistance value of the cable under test is measured and used as the resistance parameter.

[0103] The power supply unit includes a rechargeable battery, and the outer casing is provided with an external charging interface that is electrically connected to the rechargeable battery.

[0104] When the cable connector is not in operation, it should be covered with a rubber cap to prevent wear. The insulating cap can be made of rubber or other insulating materials.

[0105] The measurement and control unit is configured as an integrated circuit board, which integrates capacitive reactance detection circuit and impedance detection circuit, and the surface of the circuit board is provided with an anti-corrosion and waterproof coating.

[0106] The outer casing is configured as a closed, waterproof structure.

[0107] Before testing, the above-mentioned tester is first calibrated using a standard length cable to determine the capacitance per unit length. and resistance per unit length During testing, the rubber caps on both cable connectors are removed and connected to the two ends of the cable under test. The total capacitance C of the cable is measured using the formula: The cable length was measured. .

[0108] Then, short-circuit the two single-core wires at one end of the cable, and connect the other ends of the two single-core wires to the two cable input terminals respectively. Measure the cable resistance R using the formula: The cable length was measured. .

[0109] Finally, the command is input on the display unit and processed by the fusion algorithm: The actual length L of the cable was measured.

[0110] In some embodiments, the material of the outer shell may be selected from polyvinyl chloride, modified ABS, polycarbonate, polyoxymethylene, polytetrafluoroethylene, nylon, polyetheretherketone, stainless steel, aluminum alloy, titanium alloy, brass, fiberglass, carbon fiber composite material, and other materials that take into account chemical resistance, structural strength, processability, and electrical insulation may also be selected.

[0111] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A cable length tester for power grid construction, characterized in that, include: shell; At least two cable connectors are required to connect the cable to be tested. A measurement control unit, disposed within the housing, is configured to measure the capacitance and / or resistance parameters of the cable under test via the cable access terminal, and calculate and determine the length measurement value of the cable under test based on the capacitance and / or resistance parameters. The display unit, connected to the measurement and control unit, is used to display the measurement results; A power supply unit is used to power the cable length tester.

2. The cable length tester for power grid construction according to claim 1, characterized in that, The measurement and control unit is configured to: The capacitance and resistance parameters of the cable under test are measured through the cable access terminal. Based on the capacitance and resistance values ​​per unit length of a cable of a preset standard length, the first length value and the second length value are calculated according to the capacitance and resistance parameters, respectively. The length measurement value of the cable under test is calculated and determined based on the first length value and the second length value.

3. The cable length tester for power grid construction according to claim 2, characterized in that, The length of the cable under test is determined by the average of the first length value and the second length value.

4. The cable length tester for power grid construction according to claim 2, characterized in that, The display unit is configured as a touch screen, and the measurement control unit is further configured to: before performing length measurement, measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of known length based on the calibration command input by the user from the touch screen; Alternatively, the display unit may be configured as a display screen and an operation panel, and the measurement control unit may also be configured to: before performing length measurement, measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of known length based on the calibration command input by the user from the operation panel.

5. The cable length tester for power grid construction according to claim 1, characterized in that, The measurement and control unit is specifically configured to perform the following operations to obtain the capacitance parameters: Connect the at least two cable access terminals to the two ends of the cable under test respectively, and measure the total capacitance value of the cable under test as the capacitance parameter.

6. The cable length tester for power grid construction according to claim 1, characterized in that, The measurement and control unit is specifically configured to perform the following operations to obtain the resistance parameters: At least two conductors at one end of the cable under test are short-circuited, and then the short-circuited end and the corresponding conductors at the other end of the cable are respectively connected to the at least two cable access terminals. The loop resistance value of the cable under test is measured and used as the resistance parameter.

7. The cable length tester for power grid construction according to claim 1, characterized in that, The power supply unit includes a rechargeable battery, and the outer casing is provided with an external charging interface that is electrically connected to the rechargeable battery.

8. The cable length tester for power grid construction according to claim 1, characterized in that, The cable connector is covered with an insulating cap.

9. The cable length tester for power grid construction according to claim 1, characterized in that, The measurement and control unit is configured as an integrated circuit board, which integrates capacitive reactance detection circuit and impedance detection circuit, and the surface of the circuit board is provided with an anti-corrosion and waterproof coating.

10. A cable length tester for power grid construction according to claim 1, characterized in that, The outer casing is configured as a closed, waterproof structure.

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