Power cable fault comprehensive test system convenient for vehicle-mounted assembly

Abstract

The invention discloses a power cable fault comprehensive test system convenient for vehicle-mounted assembly, and the system comprises an input voltage regulation system, an intelligent test host control system, a DC output system, a fault detection system, a high-voltage control system, and an insulation test system. Multiple tasks such as basic property testing, fault distance initial positioning, insulation testing and high-voltage impact testing of cable faults can be completed on one device, the tedious process of using multiple devices for testing is avoided, the testing efficiency is greatly improved, the troubleshooting time is saved, and through cooperative work of the industrial frequency transformer and the voltage doubling rectifying module, the testing efficiency is improved. The system is high in boosting speed and high in power, meanwhile, the gear change-over switch can achieve three-gear high-voltage output, the test requirements of different cable grades can be met, and it is ensured that cable faults can be effectively detected under various complex conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of cable fault testing, and more particularly to a vehicle-mounted assembled power cable fault comprehensive testing system. Background Art

[0002] In modern society, the stability and reliability of power supply are crucial. Power cables, as a key carrier of power transmission, are widely used in various fields. However, because power cables are often laid underground and in complex environments such as tunnels, they are subject to various factors such as geological conditions, external damage, and electrical aging, and failures are common. Once a cable fails, quickly and accurately locating and repairing the fault point becomes a key step in ensuring power supply.

[0003] Traditional cable fault testing equipment has numerous shortcomings. For one thing, existing equipment has limited functionality and cannot meet the complex and diverse needs of cable fault testing. Different types of cable faults, such as high-resistance faults, low-resistance faults, and ground faults, often require the use of multiple different devices for testing, which is cumbersome and inefficient. Furthermore, some equipment has low integration and is bulky, making it difficult to carry and operate on-site. In actual testing scenarios, testers need to spend a considerable amount of time and effort transporting, installing, and debugging the equipment, increasing the time cost of troubleshooting. Furthermore, some test equipment has a slow voltage ramp-up speed and low power, making it unable to meet the testing requirements of different cable grades. When testing high-voltage cables, excessively long voltage ramp-up times not only affect test efficiency but can also cause additional damage to the cable.

[0004] Therefore, it is necessary to invent a vehicle-mounted assembled power cable fault comprehensive testing system to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a vehicle-mounted assembled power cable fault comprehensive testing system to solve the problems raised in the above-mentioned background technology that the existing equipment has a single function, is difficult to meet the complex and diverse cable fault testing needs, is cumbersome and inefficient to operate, and is not convenient to carry and operate on site.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a vehicle-mounted assembled power cable fault comprehensive testing system, comprising an input voltage regulation system, an intelligent test host control system, a DC output system, a fault detection system, a high-voltage control system, and an insulation testing system. The input voltage regulation system includes a power input module and a voltage regulator. The power input module is composed of an on-board generator and an isolation transformer for supplying power to various electrical devices. The intelligent test host control system is composed of an industrial control embedded computer platform, FPGA-based cable fault testing software, and a control unit, and is used to test the basic properties of the faulty cable and initially locate the fault distance.

[0007] As a further description of the above technical solution, the DC output system includes a DC output switch, a power frequency transformer, a voltage doubler rectifier module, and a protection output module connected in sequence, wherein the protection output module includes a protection module and a DC output module arranged in parallel;

[0008] As a further description of the above technical solution, the protection module includes a protection ball gap, a protection resistor and a DC output working ground socket, the power frequency transformer 1 includes a primary coil and multiple secondary coils, and the multiple secondary coils are connected in series and then connected to the voltage doubler rectifier module 1;

[0009] As a further description of the above technical solution, the fault detection system includes a fault detection switch, a second power frequency transformer, a second voltage doubling rectifier module, a combined capacitor group, and an output module connected in sequence. The output module includes a discharge module and a high-voltage impact module and a flash output / multiple pulse output module connected in sequence. The high-voltage impact module is connected to a three-speed conversion switch, which controls the gear conversion by changing the capacitor connection mode in the combined capacitor group through the three-speed conversion switch;

[0010] As a further description of the above technical solution, the power frequency transformer 2 includes multiple transformers, each transformer includes multiple primary coils and multiple secondary coils, the output end of each secondary coil is connected to a voltage doubler circuit in the voltage doubler rectifier module 2, the voltage doubler rectifier module 2 includes multiple voltage doubler circuits and multiple capacitors, and each voltage doubler circuit is connected to a capacitor;

[0011] As a further description of the above technical solution, the high-voltage control system includes a color liquid crystal display and a control circuit. The control circuit adopts an industrial control board based on a single-chip microcomputer, which is used for human-computer interaction, function mode setting, working gear setting and information warning, and controls the DC output switch and fault detection switch;

[0012] As a further description of the above technical solution, the insulation testing system is a vehicle-mounted megohmmeter, which is used to test the insulation performance of the cable and indicate the result in the form of a needle;

[0013] As a further description of the above technical solution, it also includes an onboard device, which includes a cable path detector, an acoustic and magnetic synchronous positioning device, a high-voltage bridge locator, a cable identifier and a cable piercer;

[0014] As a further description of the above technical solution, it also includes a monitoring and wireless intercom system, which provides real-time images of the test site and outside the vehicle, and a real-time one-way communication function with other staff outside the vehicle. The monitoring images are displayed on a color LCD screen;

[0015] As a further description of the above technical solution, it also includes an output cable tray, which is a system signal output line and is directly connected to the faulty cable.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention integrates multiple test functions into one, and can complete multiple tasks such as basic property testing of cable faults, initial fault distance positioning, insulation testing, high-voltage impact testing, etc. on one device, avoiding the tedious process of using multiple devices for testing, greatly improving test efficiency, and saving troubleshooting time. Through the coordinated work of the power frequency transformer and the voltage doubling rectifier module, the system has a fast boost speed and high power. At the same time, the gear conversion switch can achieve three-speed high-voltage output, which can meet the testing requirements of different cable levels and ensure that cable faults can be effectively detected under various complex situations.

[0018] 2. This invention can be used independently as a cable fault detection device or flexibly installed in a vehicle, facilitating on-site testing at various locations. The vehicle-mounted design allows the device to quickly reach the fault site, reducing the time and cost of equipment transportation and installation, and improving emergency response capabilities. The DC output system can burn through the fault point. For difficult-to-detect fault types such as high-resistance faults, burning through the fault point allows for more accurate subsequent testing and location, improving the success rate of fault resolution. 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 principle block diagram of a vehicle-mounted assembled power cable fault comprehensive testing system provided by the present invention. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0022] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] Refer to the attached Figure 1 This embodiment provides a vehicle-mounted assembled power cable fault comprehensive testing system, including an input voltage regulation system, an intelligent test host control system, a DC output system, a fault detection system, a high-voltage control system, an insulation testing system, a monitoring and wireless intercom system, an output cable reel, and a carrying device.

[0024] Input voltage regulation system: This system includes a power input module and a voltage regulator. The power input module consists of an onboard generator and an isolation transformer, allowing flexible selection of either mains power or the onboard generator. The voltage regulator precisely controls the input voltage range, ensuring stable and reliable voltage input to the system to meet power requirements in diverse operating environments.

[0025] The intelligent test host control system consists of an industrial control embedded computer platform, FPGA-based cable fault testing software, and a control unit. The industrial control embedded computer platform provides the system with stable computing and data processing capabilities. The FPGA-based cable fault testing software boasts powerful data analysis and processing capabilities, enabling testing of the basic properties of faulty cables and initial fault location, providing a crucial basis for subsequent accurate testing. The control unit coordinates the operations of various system components, ensuring precise control of the testing process.

[0026] The DC output system consists of a DC output switch, a power frequency transformer (1), a voltage doubler rectifier module (1), and a protection output module, all connected in sequence. The protection output module consists of a protection module and a DC output module arranged in parallel. The power frequency transformer (1) regulates the input voltage, while the voltage doubler rectifier module (1) boosts and rectifies the voltage, providing a stable DC power supply for burnout at the fault point. The power frequency transformer (1) consists of a primary coil and multiple secondary coils, which are connected in series to the voltage doubler rectifier module (1). The protection module consists of a protective ball gap, a protective resistor, and a DC output working socket, which protects the system and operators and prevents damage to the equipment from overvoltage and overcurrent.

[0027] Fault detection system: It consists of a fault detection switch, a power frequency transformer 2, a voltage doubler rectifier module 2, a combined capacitor group, and an output module connected in sequence. The output module includes a discharge module and a high-voltage impact module and a flash output / multiple pulse output module connected in sequence. The gear conversion switch is used to change the capacitor connection method in the combined capacitor group to achieve high-voltage output of different gears to meet the requirements of different cable levels in fault testing. The power frequency transformer 2 contains multiple transformers, each transformer contains multiple primary coils and multiple secondary coils, and the output end of each secondary coil is connected to a voltage doubler circuit in the voltage doubler rectifier module 2. The voltage doubler rectifier module 2 contains multiple voltage doubler circuits and multiple capacitors, and each voltage doubler circuit is connected to a capacitor.

[0028] High-voltage control system: This includes a color LCD display and control circuitry. The color LCD displays system operating status, test results, and other information, providing an intuitive interface for operators. The control circuitry, utilizing a single-chip microcomputer-based industrial control board, is responsible for human-machine interaction, function mode settings, operating range settings, and information alerts. The control circuitry also precisely controls the DC output switch and fault detection switch, enabling function switching, DC output start / stop control, current range settings, and overcurrent warnings, ensuring safe and stable system operation.

[0029] Insulation test system: It uses a vehicle-mounted megohmmeter to test the insulation performance of the cable, and the test results are visually indicated in the form of a needle, making it convenient for operators to quickly obtain cable insulation status information.

[0030] Monitoring and wireless intercom systems: These systems offer comprehensive functionality, providing real-time images of the test site and outside the vehicle, allowing operators to monitor the test environment and equipment status at all times. The system also enables real-time, one-way communication with other personnel outside the vehicle, facilitating on-site coordination and improving testing efficiency. The monitoring images are displayed on a color LCD, ensuring clear and intuitive viewing.

[0031] Output cable reel: Serves as the system signal output line. It contains high-voltage output cables, ground connection cables, and safety ground cables. It is directly connected to the fault cable to ensure stable and reliable signal transmission and electrical safety during testing.

[0032] Onboard equipment: including cable path detectors, acoustic and magnetic synchronous positioning instruments, high-voltage bridge locators, cable identifiers, and cable puncture tools. These onboard equipment work in conjunction with other parts of the system to achieve comprehensive detection and location of cable faults, improving the accuracy and efficiency of fault testing.

[0033] When installing the system on a vehicle, the operator first selects a suitable installation location, ensuring the equipment is securely mounted and does not affect the vehicle's normal driving and operation. The operator then installs the onboard generator, isolation transformer, and other components of the input voltage regulation system in the appropriate location in the vehicle and connects the power lines. The operator then installs the intelligent test host control system, DC output system, fault detection system, and other equipment, ensuring that the connections between each device are correct.

[0034] If the system is used as a standalone cable fault detection device, the operator should place the device in a stable, dry, and well-ventilated test area. Connect the power cord from the mains or vehicle-mounted generator to ensure a stable power supply. Connect the output cable reel to the faulty cable and other related equipment according to the system wiring diagram.

[0035] Equipment Debugging: After system installation is complete, equipment debugging is performed. Check the input voltage regulation system for stable output voltage and the voltage regulator for proper operation. Initialize the intelligent test host control system to ensure proper operation of the industrial control embedded computer platform, FPGA-based cable fault testing software, and control unit. Test the functionality of various components, including the DC output system, fault detection system, and high-voltage control system. Check the gear selector, protection module, and display for proper operation.

[0036] Test operation process

[0037] Basic Properties Test for Faulty Cables: Activate the intelligent test host control system and select the Basic Properties Test for Faulty Cables function. The control unit sends commands to the system, which tests basic parameters such as resistance and capacitance of the faulty cable. FPGA-based cable fault testing software analyzes and processes the test data to preliminarily determine the type of faulty cable and the approximate fault range.

[0038] Initial fault distance location: After completing basic property testing, the intelligent test host system controls the initial fault distance location function. The system sends a specific test signal to the faulty cable. Based on the signal reflection, the software algorithm calculates the approximate fault distance, providing a reference for subsequent accurate detection.

[0039] Insulation test: Start the insulation test system and use the on-board megohmmeter to test the insulation performance of the faulty cable. The operator observes the megohmmeter needle indication to obtain the insulation resistance value of the cable and determine whether the cable insulation condition is good.

[0040] High-voltage testing and fault location: Select the appropriate test mode and high-voltage output gear according to the type of faulty cable and the initial location results. Set parameters such as the functional mode, working gear, and pulse interval time through the high-voltage control system. Start the fault detection system, and the gear conversion switch adjusts the capacitor connection method of the combined capacitor group to achieve the corresponding high-voltage output. The high-voltage impact module generates a high-voltage impact signal, which is transmitted to the faulty cable through the output cable reel. The flash output / multiple pulse output module is used to collect the reflected signal of the fault point, and combined with the onboard equipment such as the acoustic-magnetic synchronous locator and the high-voltage bridge locator, the fault point can be accurately located.

[0041] DC output burn-through fault point: For high-resistance faults, the DC output system is activated. Closing the DC output switch activates the power frequency transformer and voltage-doubling rectifier module, producing a stable DC power supply. The protection output module applies DC power to the faulty cable, burning through the fault point for more accurate subsequent detection.

[0042] Test process monitoring and communication: During the test, operators can monitor the test site and the situation outside the vehicle in real time through the monitoring and wireless intercom system. If communication and collaboration with personnel outside the vehicle is required, the wireless intercom function can be used for real-time one-way calls to ensure smooth test progress.

[0043] Test Results Recording and Analysis: After the test is completed, the intelligent test host control system records and stores the test data. Operators can view the test results on the color LCD screen and export the data to an external storage device for further analysis and processing. Based on the test results, a corresponding cable repair plan can be formulated.

[0044] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vehicle-mounted assembled power cable fault comprehensive testing system, characterized by: It includes an input voltage regulation system, an intelligent test host control system, a DC output system, a fault detection system, a high-voltage control system and an insulation test system. The input voltage regulation system includes a power input module and a voltage regulator. The power input module consists of an on-board generator and an isolation transformer for powering various electrical equipment. The intelligent test host control system consists of an industrial control embedded computer platform, FPGA-based cable fault testing software and a control unit, which is used to perform basic property tests on faulty cables and initially locate the fault distance.

2. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 1, characterized in that: The DC output system includes a DC output switch, an industrial frequency transformer 1, a voltage doubler rectifier module 1 and a protection output module connected in sequence. The protection output module includes a protection module and a DC output module arranged in parallel.

3. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 2, characterized in that: The protection module includes a protection ball gap, a protection resistor and a DC output working socket. The power frequency transformer 1 includes a primary coil and multiple secondary coils. The multiple secondary coils are connected in series and then connected to the voltage doubling rectifier module 1.

4. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 1 is characterized in that: The fault detection system includes a fault detection switch, a second power frequency transformer, a second voltage doubling rectifier module, a combined capacitor group, and an output module connected in sequence. The output module includes a discharge module and a high-voltage impact module and a flash output / multiple pulse output module connected in sequence. The high-voltage impact module is connected to a three-speed conversion switch, which controls the gear conversion by changing the capacitor connection method in the combined capacitor group.

5. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 4 is characterized in that: The second industrial frequency transformer includes multiple transformers, each transformer includes multiple primary coils and multiple secondary coils, the output end of each secondary coil is connected to a voltage doubler circuit in the second voltage doubler rectifier module, the second voltage doubler rectifier module includes multiple voltage doubler circuits and multiple capacitors, and each voltage doubler circuit is connected to a capacitor.

6. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 1, characterized in that: The high-voltage control system includes a color LCD display and a control circuit. The control circuit uses an industrial control board based on a single-chip microcomputer, which is used for human-computer interaction, function mode setting, working gear setting and information warning, and controls the DC output switch and fault detection switch.

7. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 6, characterized in that: The insulation testing system is a vehicle-mounted megohmmeter, which is used to test the insulation performance of cables and indicate the results in the form of needles.

8. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 7, characterized in that: It also includes onboard equipment, which includes a cable path detector, an acoustic and magnetic synchronous positioning instrument, a high-voltage bridge locator, a cable identifier and a cable piercer.

9. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 8, characterized in that: It also includes a monitoring and wireless intercom system, which provides real-time images of the test site and outside the vehicle, and has a real-time one-way conversation function with other staff outside the vehicle. The monitoring images are displayed on a color LCD screen.

10. The vehicle-mounted assembled power cable fault comprehensive testing system according to claim 9, characterized in that: It also includes an output cable tray, which is a system signal output line and is directly connected to the faulty cable.

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