Secondary cable detection device

Abstract

The utility model relates to the technical field of secondary cable detection, and discloses a secondary cable detection device, which comprises a device shell, a data processing unit, a lithium battery and a full-circuit bridge module which are arranged in the device shell, and a test connecting wire which can be plugged with the device shell, the data processing unit comprises a liquid crystal touch screen located on the device shell, a processor installed on the liquid crystal touch screen, a memory and a communication module. According to the secondary cable detection device, the cable insulation layer of the secondary cable is regarded as the high-resistance resistor, the direct-current voltage of the corresponding grade is applied according to the use scene of the secondary cable, the current value passing through the high-resistance resistor is finally obtained, and data support is provided for testers to judge the defects of cable inner core wires, insulation, aging, structural deformation and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary cable detection, in particular to a secondary cable detection device. Background Art

[0002] According to relevant regulations of the China Southern Power Grid, the renovation of protection devices and station automation systems is allowed without replacing secondary cables. This improves renovation efficiency, saves money, reduces power outages, and reduces work risks. However, it is necessary to strengthen the assessment of secondary cable risks and circuit compliance. For equipment spacing where the cable circuit meets operational requirements, the "original screen renovation" technical solution is encouraged. Secondary control cables are cables composed of multiple insulated conductors. In power systems, they are mainly used for signal acquisition and transmission in secondary circuits. Their internal structure generally includes conductors, insulation layers, and sheaths.

[0003] Currently, there is no corresponding detection method for the inspection and evaluation of secondary cables. In particular, when the cable is highly aged, the degree of cable insulation degradation will gradually increase over time, seriously affecting the stable operation of the equipment. Therefore, it is necessary to develop a set of equipment to conduct multi-faceted inspections on secondary cables and evaluate the operating risks of secondary cables. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a secondary cable detection device, through which the insulation resistance is tested, thereby realizing the evaluation of the secondary cable operation risk.

[0005] The technical solution adopted by this utility model is:

[0006] A secondary cable detection device comprises a device housing, a data processing unit installed in the device housing, a lithium battery and a full-circuit bridge module, and a test connection line capable of being plugged into the device housing;

[0007] The lithium battery is electrically connected to the data processing unit; the data processing unit includes a liquid crystal touch screen located on the device housing, a processor, a memory, and a communication module installed on the liquid crystal touch screen, and the data processing unit is communicatively connected to the full-circuit bridge module through the communication module; the full-circuit bridge module is connected to the connection line between the lithium battery and the data processing unit, and the full-circuit bridge module is electrically connected to the test line interface located on the device housing.

[0008] Furthermore, a switch is provided on the connection line between the lithium battery and the data processing unit, and the switch is located on the device housing.

[0009] Furthermore, there are two test line interfaces, including a cable core interface and a cable ground interface.

[0010] Furthermore, there are two test connection wires, including a first test connection wire and a second test connection wire; one end of the first test connection wire is a metal plug that can be inserted into the cable core wire interface, and the other end is an alligator clip that can clamp the cable conductor; one end of the second test connection wire is a metal plug that can be inserted into the cable grounding interface, and the other end is an alligator clip that can clamp the cable insulation layer.

[0011] Furthermore, the full-circuit bridge module includes a communication module and four sets of high-frequency generators, which are communicatively connected to the data processing unit processor through the communication module, and control the output voltage of the test line interface by controlling the working number of the high-frequency generators.

[0012] Furthermore, the full-circuit bridge module is connected to the connection line between the lithium battery and the data processing unit through the step-down module.

[0013] Furthermore, a USB data export interface is provided on the device housing, and the USB data export interface is electrically connected to the data processing unit.

[0014] Furthermore, a power adapter electrically connected to the lithium battery is installed in the device housing. The power adapter is electrically connected to a power cord interface located on the device housing, and a power cord can be plugged in through the power cord interface.

[0015] The beneficial effects of the utility model are:

[0016] This secondary cable detection device treats the cable insulation layer of the secondary cable as a high-resistance resistor, applies a DC voltage of corresponding level according to the secondary cable usage scenario, and finally obtains the current value passing through the high-resistance resistor, providing data support for testers to determine defects such as the cable core conductor, insulation, aging and structural deformation.

[0017] The secondary cable detection device is easy to connect, install, and operate, reducing the time required for traditional detection methods and improving overall detection efficiency. By assessing the aging of the secondary cables and adopting a technical solution for retrofitting existing screens, the capital investment required for renovation is reduced, lowering maintenance costs.

[0018] The secondary cable detection device is equipped with an LCD touch screen and a data processing unit, which can display test results and related information in real time, facilitating monitoring and evaluation by operators. It selects an appropriate DC voltage based on the use scenario of the secondary cable, adapting to the detection requirements of different voltage levels, thereby significantly improving the detection capability and evaluation efficiency of the secondary cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the secondary cable detection device of the utility model in use;

[0021] Figure 2 This is the wiring diagram of the secondary cable detection device of the utility model;

[0022] Figure 3 Working principle diagram of the secondary cable detection device of the utility model;

[0023] In the figure: 1. Device housing; 2. Data processing unit; 3. Lithium battery; 4. Full-circuit bridge module; 5. LCD touch screen; 6. Communication module; 7. Switch; 8. Cable core wire interface; 9. Cable grounding interface; 10. First test connection line; 11. Second test connection line; 12. Communication module; 13. High-frequency generator; 14. Step-down module; 15. USB data export interface; 16. Power adapter; 17. Power cord interface. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0025] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] For the detection and evaluation of secondary cables, this embodiment provides a secondary cable detection device. The secondary cable detection device regards the cable insulation layer of the secondary cable as a high-resistance resistor, applies a DC voltage of a corresponding level according to the secondary cable usage scenario, and finally obtains the current value passing through the high-resistance resistor. This provides data support for testers to determine defects such as the cable core conductor, insulation, aging, and structural deformation, thereby improving the detection capability and evaluation efficiency of secondary cables.

[0027] Specifically, such as Figure 1 and Figure 2 As shown, the secondary cable detection device includes a device housing 1, a data processing unit 2, a lithium battery 3 and a full-circuit bridge module 4 installed in the device housing 1, and a test connection line that can be plugged into the device housing 1.

[0028] The lithium battery 3 is a 24V high-capacity polymer lithium battery in an aluminum-plastic flexible package, which is safer, has sufficient capacity, and can be cycled approximately 1,500 times. The lithium battery 3 is electrically connected to the data processing unit 2 to provide power. A switch 7 is provided on the device housing 1, connecting the lithium battery 3 and the data processing unit 2.

[0029] The data processing unit 2 includes an LCD touchscreen 5 located on the device housing 1, a processor, memory, and a communication module 6 mounted on the LCD touchscreen 5. The LCD touchscreen 5 can be a commercially available Nextion NX8048K070, which is 7 inches in size and has a resolution of 800x480. The LCD touchscreen 5 is a four-wire resistive type with a rated power of 5W. The LCD touchscreen 5 can be equipped with a processor, such as the commercially available FriendlyARM NanoPC-T4, which is equipped with a Cortex-A73 multi-core processor. The LCD touchscreen 5 has an RS232 or RS485 serial port interface, allowing it to connect to a commercially available FTDI RS232 communication module or a commercially available MAXIM Integrated MAX485 communication module.

[0030] The data processing unit 2 is connected to the full-circuit bridge module 4 through the communication module 6. The data processing unit 2 allows the tester to select the corresponding voltage level according to the use environment of the secondary cable through the liquid crystal touch screen 5; the processor forms corresponding control instructions to the full-circuit bridge module 4 based on the selected voltage level.

[0031] The full-circuit bridge module 4 uses a commercially available Texas Instruments LMP90080 precision bridge measurement amplifier. The full-circuit bridge module 4 has an RS232 or RS485 serial port interface, allowing it to connect to a commercially available FTDI RS232 communication module or a commercially available MAXIM Integrated MAX485 communication module. Communication between the module and the processor of the data processing unit 2 is achieved via the communication module 12. Furthermore, Figure 2 As shown, the full-circuit bridge module 4 also includes four sets of high-frequency generators 13, which are commercially available Parker Hannifin Plasma Series high-frequency plasma generators. Based on the processor's control instructions, the full-circuit bridge module 4 controls the output voltage of the test line interface by controlling the number of high-frequency generators 13 in operation. When one set of high-frequency generators 13 is operating, the full-circuit bridge module 4 generates a 50V output voltage; when two sets of high-frequency generators 13 are operating, the full-circuit bridge module 4 generates a 100V output voltage; when three sets of high-frequency generators 13 are operating, the full-circuit bridge module 4 generates a 250V output voltage; and when four sets of high-frequency generators 13 are operating, the full-circuit bridge module 4 generates a 500V output voltage, thereby adapting to the actual use environment of the secondary cable.

[0032] The full-circuit bridge module 4 is connected to the connection line between the lithium battery 3 and the data processing unit 2 and is powered by the lithium battery 3. The full-circuit bridge module 4 is electrically connected to the test line interface located on the device housing 1, and a test connection line is connected through the test line interface to detect the secondary cable.

[0033] Furthermore, since the working voltage of the full circuit bridge module 4 is 12V, and the lithium battery 3 adopts a 24V polymer large-capacity lithium battery, Figure 1 and Figure 2 As shown, the circuit bridge module in this embodiment is connected to the connection line between the lithium battery 3 and the data processing unit 2 through the step-down module 14, so that the lithium battery 3 can power the full circuit bridge module 4. The step-down module 14 adopts the commercially available Texas Instruments LM2596 step-down converter.

[0034] Further, such as Figure 1 and Figure 2 As shown, there are two test line interfaces, including a cable core wire interface 8 and a cable grounding interface 9, and two test connection lines, including a first test connection line 10 and a second test connection line 11; one end of the first test connection line 10 is a metal plug that can be inserted into the cable core wire interface 8, and the other end is an alligator clip that can clamp the cable conductor; one end of the second test connection line 11 is a metal plug that can be inserted into the cable grounding interface 9, and the other end is an alligator clip that can clamp the cable insulation layer.

[0035] In addition, considering the charging problem of lithium battery 3, such as Figure 1 and Figure 2 As shown, in this embodiment, a power adapter 16 electrically connected to the lithium battery 3 is also installed within the device housing 1. The power adapter 16 uses the commercially available Mean Well GST25A24 and has overcurrent, overvoltage, and short-circuit protection functions. The power adapter 16 is electrically connected to a power cord interface 17 located on the device housing 1, through which a power cord can be plugged. The lithium battery 3 is connected to the 220V mains power supply through the power adapter 16 and the power cord, thereby realizing the charging function of the lithium battery 3.

[0036] Based on the above description of electrical components, the secondary cable detection device is used as follows Figure 1 As shown, first, insert one end of the first test cable 10 into the cable core interface 8, with the other end clamping the cable conductor; insert one end of the second test cable 11 into the cable ground interface 9, with the other end clamping the cable insulation layer; and the secondary cable detection device is now installed. At this point, activate the switch 7 on the device housing 1, select a corresponding DC voltage value on the LCD touch screen 5 based on the voltage level of the actual operating environment of the secondary cable being tested. After confirming the test voltage on the LCD touch screen 5, the processor issues a control instruction to the full-circuit bridge module 4 based on the test voltage. The full-circuit bridge module 4 controls the four high-frequency generators 13 to partially or fully operate based on the test voltage, thereby applying the corresponding DC voltage to the secondary cable being tested.

[0037] like Figure 2 and Figure 3 As shown, since the secondary cable includes a conductor, an insulation layer, a sheath and other parts, after applying the corresponding DC voltage, the cable insulation layer of the secondary cable can be regarded as a high-resistance resistor, and the current value passing through the high-resistance resistor is returned to the full-circuit bridge module 4 and transmitted to the processor; the processor stores the applied DC voltage value and the current value passing through the high-resistance resistor in the memory, and at the same time displays the current value passing through the high-resistance resistor through the LCD touch screen 5. The test personnel use this as data basis to determine the degree of insulation aging of the tested secondary cable.

[0038] In addition, Figure 1 As shown, a USB data export interface 15 is also provided on the device housing 1 in this embodiment, and the USB data export interface 15 is electrically connected to the data processing unit 2; when data export is required, a U disk can be inserted through the USB data export interface 15 to export historical test data.

[0039] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A secondary cable detection device, characterized in that: The device comprises a housing, a data processing unit, a lithium battery and a full-circuit bridge module installed in the housing, and a test connection line that can be plugged into the housing; The lithium battery is electrically connected to the data processing unit; the data processing unit includes a liquid crystal touch screen located on the device housing, a processor, a memory, and a communication module installed on the liquid crystal touch screen, and the data processing unit is communicatively connected to the full-circuit bridge module through the communication module; the full-circuit bridge module is connected to the connection line between the lithium battery and the data processing unit, and the full-circuit bridge module is electrically connected to the test line interface located on the device housing.

2. The secondary cable detection device according to claim 1, characterized in that: A switch is provided on the connection line between the lithium battery and the data processing unit, and the switch is located on the device housing.

3. The secondary cable detection device according to claim 1, characterized in that: There are two test line interfaces, including a cable core interface and a cable ground interface.

4. The secondary cable detection device according to claim 3, characterized in that: There are two test connection wires, including a first test connection wire and a second test connection wire; one end of the first test connection wire is a metal plug that can be inserted into the cable core wire interface, and the other end is an alligator clip that can clamp the cable conductor; one end of the second test connection wire is a metal plug that can be inserted into the cable grounding interface, and the other end is an alligator clip that can clamp the cable insulation layer.

5. The secondary cable detection device according to claim 1, characterized in that: The full-circuit bridge module includes a communication module and four sets of high-frequency generators, which are connected to the data processing unit processor through the communication module and control the output voltage of the test line interface by controlling the working number of the high-frequency generators.

6. The secondary cable detection device according to claim 1, characterized in that: The full-circuit bridge module is connected to the connection line between the lithium battery and the data processing unit through the step-down module.

7. The secondary cable detection device according to claim 1, characterized in that: The device housing is also provided with a USB data export interface, which is electrically connected to the data processing unit.

8. The secondary cable detection device according to claim 1, characterized in that: A power adapter electrically connected to the lithium battery is also installed in the device housing. The power adapter is electrically connected to a power line interface on the device housing, and a power line can be plugged in through the power line interface.

Images