Telescopic intelligent cable circulation measuring device

Abstract

The invention relates to a telescopic intelligent cable circulation measuring device, which relates to the technical field of power transmission, and comprises the following steps: a measuring unit acquires circulation data and field image data of a power transmission cable; the telescopic driving unit drives the measuring unit to move along the telescopic direction; the fixing and moving unit supports and moves the telescopic intelligent cable circulation measuring device and fixes the telescopic intelligent cable circulation measuring device on a field stable carrier; the wireless transmission unit remotely transmits the circulation data and the field image data to a background terminal; the control unit controls the measuring unit to collect data, controls the telescopic driving unit to move in the telescopic direction, and controls the wireless transmission unit to transmit data, by means of the technical scheme, workers do not need to go down a well or go up a tower, the workers are prevented from being in a dangerous environment, and personal safety is guaranteed; manual operation and on-site residence time are reduced, the working efficiency is improved, and the requirement of large-scale cable network rapid inspection is met; the method adapts to complex field environments.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, specifically to a scalable intelligent cable circulating current measuring device. Background Technology

[0002] As a core component of modern power systems, the safe and stable operation of power transmission cable lines is the cornerstone of ensuring the reliability of the entire power grid. In the routine maintenance and preventative testing of cables, circulating current measurement of power transmission cable lines is a crucial and essential step.

[0003] Currently, in the power industry, circulating current measurement of transmission cable lines still mainly relies on traditional manual on-site operations. Specifically, for cables laid in underground cable wells, workers must first open the well cover for extended ventilation, then use specialized equipment to test the air quality underground. Only after confirming safety can they descend into the well to the cable location and operate using handheld measuring instruments. Similarly, for cable terminals or joints erected on towers, workers must climb the tower to reach the measurement location.

[0004] However, the existing measurement methods and the equipment they rely on have many shortcomings and deficiencies. First, both working in wells and on towers expose workers directly to hazardous environments. Inside the confined cable wells, workers not only face the risks of oxygen deprivation and poisoning, but also the potentially fatal threat of explosions caused by faulty cable joints or the cable itself. Working on high-altitude towers, on the other hand, is always accompanied by safety hazards such as falls from heights and being struck by objects, requiring stringent and costly personal safety measures.

[0005] Secondly, traditional measurement procedures are cumbersome and time-consuming. The forced ventilation and gas detection process before going down into the well for measurement usually takes tens of minutes or even longer, greatly consuming effective working time. Similarly, climbing the tower is also quite strenuous and slow, resulting in the preparation and support time for a single measurement task far exceeding the actual measurement time, leading to extremely low overall work efficiency and making it difficult to meet the needs of rapid inspection of large-scale cable networks.

[0006] Finally, existing circulation measurement equipment typically lacks a dedicated structural design for complex field environments. On the one hand, the equipment itself is bulky and lacks portability, making transportation and rapid deployment extremely difficult on uneven terrain or in narrow cable wells. On the other hand, the measurement probes are mostly fixed structures, which are inconvenient to operate when coupled with cables of different diameters and can easily generate unnecessary torque or stress on the cables during installation or disassembly, potentially causing long-term damage to the cable structure. Summary of the Invention

[0007] In view of this, this application provides a scalable intelligent cable circulating current measurement device, the main purpose of which is to solve the following problems: firstly, the existing measurement methods expose workers directly to hazardous environments; secondly, the overall operation efficiency is extremely low, making it difficult to meet the needs of rapid inspection of large-scale cable networks; and finally, existing circulating current measurement equipment usually lacks the technical problem of dedicated structural design for complex field environments.

[0008] In a first aspect, this application provides a retractable intelligent cable circulating current measuring device, comprising: a measuring unit, a telescopic drive unit, a fixed and movable unit, a control unit, a wireless transmission unit, a power supply unit, and a housing assembly, wherein the measuring unit, the telescopic drive unit, the fixed and movable unit, and the wireless transmission unit are electrically connected to the control unit; The measurement unit is used to collect circulating current data and on-site image data of the power transmission cable; The telescopic drive unit is used to drive the measuring unit to move along the telescopic direction so that the measuring unit can fit against the power transmission cable at a distance. The fixed and movable unit is used to support and move the retractable intelligent cable circulation current measuring device, and to fix the retractable intelligent cable circulation current measuring device on the field stable carrier; The wireless transmission unit is used to remotely transmit the circulation data and the on-site image data to the back-end terminal; The control unit is used to control the measuring unit to acquire data, control the telescopic drive unit to move along the telescopic direction, and control the wireless transmission unit to transmit data. The power supply unit is used to provide operating power to the above-mentioned units; The housing assembly is used to provide protection and installation support for the aforementioned units.

[0009] By employing the above technical solution, this application provides a retractable intelligent cable circulating current measuring device. Compared with the prior art, this application includes: a measuring unit for collecting circulating current data and on-site image data of power transmission cables; a telescopic drive unit for driving the measuring unit to move along the telescopic direction so that the measuring unit can be in close contact with the power transmission cable at a distance; a fixing and moving unit for supporting and moving the retractable intelligent cable circulating current measuring device and fixing it to a stable on-site carrier; a wireless transmission unit for remotely transmitting circulating current data and on-site image data to a back-end terminal; a control unit for controlling the measuring unit to collect data, controlling the telescopic drive unit to move along the telescopic direction, and controlling the wireless transmission unit to transmit data; a power supply unit for providing operating power to the above units; and a housing assembly for providing protection and installation support for the above units.

[0010] By adopting the above technical solution, the telescopic drive unit of this application device can drive the measuring unit to move along the telescopic direction, enabling the measuring unit to collect data by contacting the power transmission cable from a distance. Workers do not need to enter the cable well or climb the tower; they can complete the measurement task from a safe distance, avoiding direct contact with hazardous environments and greatly ensuring personal safety. The telescopic drive unit of this application device can quickly drive the measuring unit to a suitable position for data collection. The fixed and mobile units facilitate rapid movement and fixation of the device on-site, reducing manual operation and on-site dwell time. Simultaneously, the wireless transmission unit can remotely transmit the collected data to the back-end terminal in real time, eliminating the need for manual data transport, further improving work efficiency and meeting the needs of rapid inspection. The fixed and mobile units of this application device are rationally designed, possessing good portability and mobility, adapting to the transportation needs of different terrains, facilitating rapid deployment on outdoor roads or inside cable wells, and improving the applicability of the device in complex on-site environments. The telescopic drive unit of this application device enables the measuring unit to adjust the telescopic distance according to power transmission cables of different diameters, achieving a good fit with the cable. It is convenient and quick to operate, while avoiding potential damage to the cable caused by improper installation and disassembly, and improving the device's adaptability to cables of different specifications.

[0011] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 2 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 3 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 4 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 5 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 6 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 7 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 8 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 9 A schematic diagram of another scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 10 A flowchart illustrating the operation of a scalable intelligent cable circulating current measuring device provided in this application embodiment; Figure 2 middle: 1-Ammeter; 2-Camera; 3-Roller; 4-Push rod motor; 5-Telescopic rod mounting base; Figure 3 middle: 6-Antenna; 7-Image transmission module; Figure 5 middle: 8-Bottom cover; 9-Battery; 10-Module; 11-Front cover; 12-Antenna; Figure 9 middle: 13-Quick clamp; 14-Main board battery cover; 15-Bottom shell; 16-Push rod motor battery; 17-Main board; 18-Display screen; 19-Button switch; 20-Forward / reverse switch; 21-Acrylic sheet; 22-Face shell. Detailed Implementation

[0015] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0018] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] To address the issues of existing measurement methods that expose workers to hazardous environments, have extremely low overall operational efficiency, and fail to meet the demands of rapid inspection of large-scale cable networks, and lack specialized structural designs for complex field environments, this application provides a scalable intelligent cable circulating current measurement device.

[0020] like Figure 1 As shown, an embodiment of this application provides a scalable intelligent cable circulating current measuring device. The device adopts a modular design and may include: a measuring unit, a telescopic drive unit, a fixed and movable unit, a control unit, a wireless transmission unit, a power supply unit, and a housing assembly. The measuring unit, telescopic drive unit, fixed and movable unit, and wireless transmission unit are electrically connected to the control unit. Each unit works collaboratively to achieve intelligent circulating current measurement. The specific structure and working principle are as follows: like Figure 2 As shown, the measurement unit can be used to collect circulating current data and on-site image data of power transmission cables; The telescopic drive unit can be used to drive the measuring unit to move along the telescopic direction so that the measuring unit can fit the power transmission cable at a long distance. The fixed and movable unit can be used to support and move the retractable intelligent cable circulation current measuring device, and to fix the retractable intelligent cable circulation current measuring device on a stable carrier in the field; The wireless transmission unit can be used to remotely transmit circulation data and on-site image data to the back-end terminal. The control unit can be used to control the measurement unit to acquire data, control the telescopic drive unit to move along the telescopic direction, and control the wireless transmission unit to transmit data. The power supply unit can be used to provide operating power to the above-mentioned units; The housing assembly can be used to provide protection and mounting support for the aforementioned units.

[0021] In this embodiment, the measurement unit serves as the core of data acquisition. Its core components may include a high-precision ammeter, an environment-adaptive high-definition camera, and a measuring base. The ammeter may be equipped with a high-precision current sensing module (i.e., a current sensor). The current sensor can be used to collect circulating current data of the power transmission cable, which can meet the accuracy requirements of power system circulating current measurement. The high-definition camera has clear imaging capabilities in complex lighting environments and can be used to collect on-site image data of the power transmission cable. Both are fixed together on the measuring base at the front end of the telescopic rod (i.e., the measuring base, used to fix the current sensor and the high-definition camera). The measuring base and the telescopic rod adopt a detachable connection structure, which facilitates later maintenance and component replacement.

[0022] In this embodiment, the telescopic drive unit can perform the position adjustment function of the measuring unit. It mainly consists of a DC servo push rod motor, a multi-section nested telescopic rod, and a mounting base with buffer and shock absorption design. The push rod motor can be fastened to the preset mounting position inside the housing with bolts. One end of the telescopic rod is rigidly connected to the output shaft of the push rod motor to ensure stable power transmission, and the other end is fixedly connected to the measuring base. The telescopic rod is driven to extend and retract by the forward and reverse rotation of the push rod motor, thereby driving the measuring unit to the designated measuring position.

[0023] In this embodiment, the fixed and moving unit is responsible for the on-site transportation and stable fixation of the equipment. It may include four omnidirectional silent rollers and two sets of quick clamps. The omnidirectional silent rollers are equipped with braking and locking functions and are symmetrically installed at the four corners of the bottom of the shell of the telescopic intelligent cable circulation current measuring device. They are used to move the telescopic intelligent cable circulation current measuring device and can adapt to uneven on-site road surfaces, making it convenient for the equipment to move flexibly. In this embodiment, the quick clamp can adopt an elastic clamping structure with an inner anti-slip rubber lining to enhance clamping stability. It is fixed on a bracket preset on the side of the shell of the retractable intelligent cable circulation current measuring device. When used for measurement, the retractable intelligent cable circulation current measuring device can be clamped and fixed to a stable carrier such as the edge of a cable well or a tower support to prevent the device from shifting during the measurement process, thus fixing the retractable intelligent cable circulation current measuring device.

[0024] In this embodiment, as Figure 3As shown, the wireless transmission unit enables remote interaction of data and images, and consists of an omnidirectional high-gain antenna and an image transmission auxiliary circuit supporting a real-time transmission protocol: [Example 1] Figure 4 As shown, the omnidirectional high-gain antenna can be mounted on the raised bracket on the top of the housing to ensure unobstructed signal transmission; the image transmission auxiliary circuit can be integrated into the main board of the control unit, and connected to the antenna, the ammeter of the measurement unit and the camera through wires to transmit the collected circulating current data and on-site images to the back-end terminal in real time.

[0025] In this embodiment, as Figure 5 As shown, the power supply unit provides power to the entire device and may include a rechargeable lithium battery compatible with 8 hours of continuous operation and a battery cover with anti-loosening clips. The lithium battery can be installed in a separate battery compartment inside the housing assembly, and is electrically connected to the main board via wires to power each power module. The battery cover can be fixed to the battery compartment opening at the bottom of the housing with screws, allowing for removable sealing of the battery compartment. The anti-loosening clips prevent the cover from loosening during device movement and facilitate subsequent battery replacement and charging. Figure 6 As shown.

[0026] In this embodiment, as Figure 7 As shown, the control unit, acting as the "central system" of the device, includes core components such as a motherboard integrating a control chip and signal processing module, a high-definition touchscreen display, and a set of function buttons. The motherboard is fixed to an insulating mounting plate in the middle layer inside the casing. The display screen is embedded in a pre-set slot on the front of the casing. Function buttons are distributed on both sides of the display screen, including start / stop buttons, telescopic adjustment buttons, etc. The motherboard is connected to the display screen, function buttons, push rod motor, image transmission auxiliary circuit, and lithium battery via wires. It can receive operation commands from the buttons or display screen, drive the various modules to work together, and process measurement data before feeding it back to the display screen, such as... Figure 8 As shown.

[0027] In this embodiment, as Figure 9 As shown, the outer shell assembly provides protection and installation support for the internal modules and can be composed of a front shell, a bottom cover, and a high-transmittance acrylic sheet. Both the front shell and the bottom cover are made of aging-resistant non-metallic materials and can be connected in a sealed manner by bolts. The internal components have reserved installation positions for each module and wiring channels. The acrylic sheet is sealed and embedded in the front of the front shell in the area corresponding to the field of view of the display screen and the measurement unit, which protects the display screen from external damage and does not obstruct the shooting field of view of the measurement unit camera.

[0028] The metal components of the telescopic intelligent cable circulation current measuring device (including all connecting screws, push rod motor housing, telescopic rod nesting parts, clamp brackets, etc.) are all made of 304 stainless steel or hot-dip galvanized materials to meet the corrosion resistance requirements of outdoor environments and prevent rust during long-term use; the non-metallic components (including the face shell, bottom cover, roller rubber layer, clamp lining, etc.) are made of aging-resistant engineering plastics with UV resistance and high and low temperature resistance to ensure that they are not easily aged or deformed under complex outdoor climate conditions; all electrical components (including the main board, image transmission auxiliary circuit, ammeter, push rod motor, etc.) adopt industrial-grade protection design with a protection level of not less than IP54, which can resist the intrusion of dust and splash water and adapt to outdoor working environments.

[0029] The hardware architecture is based on the core logic of "control center - function execution - data interaction - power supply guarantee". Each module adopts a modular circuit design. The selection of core components, circuit connection and functional implementation are as follows: 1) Control unit hardware design: The control unit may include: a core controller, a touch display screen, and function buttons; The touch screen is electrically connected to the core controller to receive touch commands; the function buttons are electrically connected to the core controller to receive operation commands; the core controller is configured to: receive touch commands from the touch screen or operation commands from the function buttons; output control signals to control the measurement unit to perform data acquisition according to the touch commands or operation commands; output control signals to control the telescopic drive unit to move along the telescopic direction; receive and process circulating current data and field image data from the measurement unit; feed back the processed circulating current data and field image data to the touch screen for display; and control the circulating current data and field image data to transmit data through the wireless transmission unit. The core controller can be an STM32F103C8T6 microcontroller (MCU), based on the ARM Cortex-M3 core, with a main frequency of 72MHz, 128KB Flash and 20KB RAM, and supports multiple serial ports, SPI, I2C and other peripheral interfaces to meet the needs of multi-module collaborative control. Interface circuit: Interacting with the display: Connect to a 1.8-inch TFT touchscreen (240×320 resolution) via the SPI interface to enable parameter setting and data display; Interaction with function buttons: Four independent button circuits are used, with a 10KΩ pull-up resistor in series to prevent level drift. The button signals are directly connected to the MCU's GPIO pins (PA0-PA3). Interacting with the motor drive: Output PWM control signals via UART interface (baud rate 9600), or connect to the motor drive chip via GPIO pins (PB0-PB3); Interacting with data processing: An integrated 12-bit ADC module is used to acquire analog signals from the current sensor, with a sampling rate of up to 1MHz to ensure measurement accuracy.

[0030] 2) Measurement Unit Hardware Design The measurement unit may include a current acquisition module: it adopts an ACS712-5A high-precision current sensor with a range of ±5A, sensitivity of 185mV / A, and linearity error ≤1.5%. The output analog signal is filtered by an RC filter circuit (10KΩ resistor + 0.1μF capacitor) and then connected to the ADC pin (PA4) of the MCU to realize the acquisition of circulating current data of the power transmission cable. The measurement unit may also include an image acquisition module: an OV7670 high-definition camera module can be selected, which supports VGA (640×480) resolution and a frame rate of 30fps. Parameters are configured through the I2C interface and image data is transmitted through the DVP interface. The module has built-in ISP image processing function and can adapt to low light and strong electromagnetic interference environments. The image data is processed by the MCU and then transmitted to the image transmission auxiliary circuit.

[0031] 3) Hardware design of the telescopic drive unit The telescopic drive unit may include a motor drive circuit: it may use a TB6612FNG dual-channel motor drive chip, which supports a maximum continuous current of 1.2A. It outputs direction control signals and PWM speed control signals through the MCU's GPIO pins (PC0-PC3) to realize the forward and reverse rotation (telescopic) and speed adjustment (0-1000rpm) of the push rod motor. The telescopic drive unit may also include a limit protection circuit: at least two Hall sensors (A3144) are installed at the beginning and end of the telescopic rod. The Hall sensors can be set at the telescopic limit positions of the telescopic rod. The Hall sensors are electrically connected to the control unit. When the telescopic rod reaches the limit position, the Hall sensors output a low-level signal to the GPIO pins (PD0-PD1) of the MCU of the control unit, so that the control unit controls the push rod motor to trigger an emergency stop to avoid mechanical damage.

[0032] 4) Wireless transmission unit hardware design The wireless transmission unit may include: a data transmission module, an image transmission auxiliary circuit, and an omnidirectional high-gain antenna; The data transmission module is used to transmit circulating data to the backend terminal; The image transmission auxiliary circuit is used to transmit on-site image data to the back-end terminal. An omnidirectional high-gain antenna is electrically connected to the data transmission module and the image transmission auxiliary circuit to enhance the signal transmission of circulating data and on-site image data; The data transmission module can use the SX1278 LoRa wireless module, which operates at a frequency of 433MHz, has a maximum transmission distance of 1.5km (open environment), a receiving sensitivity of -148dBm, communicates with the MCU through the SPI interface, supports transparent transmission mode, and realizes remote transmission of circulating data (16-bit binary format) and image data (JPEG compression format). The image transmission auxiliary circuit can integrate a MAX232 level conversion chip to convert the MCU's TTL level to RS232 level, matching the image transmission module (such as HD1080P mini image transmission) to ensure the stability of on-site image data transmission. The image transmission module is powered by a 12V lithium battery after conversion by an LM1117-5V voltage regulator chip.

[0033] 5) Power supply unit hardware design Power management circuit: It can use a 12V / 5000mAh rechargeable lithium battery (lithium-ion cell, cycle life ≥500 times), and achieve constant current and constant voltage charging through the TP4056 charging management chip. The charging current is 1A, and the power is automatically cut off when fully charged. Voltage regulator circuit: can be powered separately by two DC-DC converter circuits: One path outputs 12V via the LM2596-12V chip to power the linear motor and image transmission module; Another path outputs 3.3V via the AMS1117-3.3V chip to power the MCU, current sensor, wireless module, and display screen; Protection circuit: A self-resetting fuse (12V / 2A) is connected in series at the power output terminal, and a TVS transient voltage suppressor diode (SMBJ15CA) is connected in parallel to prevent overcurrent and overvoltage damage to the device.

[0034] This program adopts a "main program + interrupt service + functional sub-module" architecture, is developed based on the KeilMDK5 environment, and is written in C language. Its core functions include parameter configuration, scaling control, data acquisition, wireless transmission, and fault diagnosis. The total code size is about 8KB, and the runtime memory usage is ≤5KB.

[0035] 1) Overall program architecture: Main program flow: After the system is powered on, it first performs initialization (GPIO, ADC, UART, SPI, timer), and then enters a loop: read button / touch command → execute corresponding function (parameter setting / extension / measurement) → collect data → process and display → wireless transmission → fault detection, with a loop period of 100ms; Interrupt Service: Configure 3 interrupts: Timer 2 interrupt (1ms timing): used for PWM signal generation and button debouncing; ADC interrupt (triggered upon sampling completion): used for current data acquisition; External interruption (PD0-PD1): Triggered by Hall sensor to achieve limit protection of telescopic rod.

[0036] 2) Core Functional Module Programming The core controller can be configured with a parameter configuration module: The measurement mode (single measurement / continuous measurement), telescopic pole extension speed (levels 1-5, corresponding to 200-1000rpm), and data transmission interval (1s-10s) can be set via touch screen or buttons. Implementation logic: The touch screen can use modular driving functions to read touch coordinates via SPI and match preset button areas (such as "mode selection" and "speed+"). The parameters are stored in the MCU's Flash (address 0x08007000) and are automatically read upon power-on to avoid repeated configuration. The code is as follows: if(touch_x>50&&touch_x<150&&touch_y>50&&touch_y<100){ measure_mode=1; / / 1=continuous measurement, 0=single measurement save_param_to_flash(measure_mode, speed, trans_interval); / / Store parameters display_param(measure_mode, speed, trans_interval); / / Display parameters } The core controller can be configured with a telescopic control module; The telescopic control module can be used to: receive telescopic commands, which include speed levels; The target PWM duty cycle is calculated using a PID algorithm based on the speed level. The target PWM duty cycle signal is output to the motor drive chip of the telescopic drive unit to control the telescopic rod's extension and retraction speed; When the trigger signal from the limit sensor is received, the output of the target PWM duty cycle signal is immediately stopped to control the telescopic drive unit to stop urgently; Specifically, the telescopic control module can control the extension / retraction of the telescopic rod according to instructions, combined with limit protection to prevent overtravel; Implementation logic: The motor speed can be adjusted using a PID algorithm. The target speed is mapped by a "speed level" (e.g., level 3 corresponds to 600 rpm). A PWM signal (frequency 10 kHz) is output through timer 2 with a duty cycle of 0-100%. When the Hall sensor is triggered (external interrupt), the motor stop flag is immediately set and the PWM output is turned off. The code is as follows: void motor_extend(void){ if(limit_extend_flag==0){ / / Extension limit not triggered motor_dir=1; / / Direction: Extend pid_set_target(speed_level 200); / / Target speed = grade × 200 rpm pid_control(); / / PID controls PWM duty cycle } else{ motor_stop(); / / Triggers the limit switch, stopping the motor. } } The core controller is also equipped with a data acquisition and processing module; The data acquisition and processing module is used to: sample the analog signal from the current sensor multiple times using the integrated ADC module; The moving average algorithm is used to filter the ADC values ​​sampled multiple times; The filtered ADC value is corrected for error using a preset calibration formula to obtain the actual circulating current value; Based on the actual circulation value, the on-site image data is compressed using JPEG. Specifically, for current acquisition: the ADC module can sample 10 times in a single run, using a moving average algorithm for filtering (removing the maximum and minimum values ​​and then taking the average), and correcting for errors using a calibration formula. Calibration formula: actual_current = (adc_value - adc_offset) 5.0 / 4095.0 / 0.185 (adc_offset is the ADC value at zero current, approximately 2048); Image acquisition: The OV7670 can be configured to VGA resolution and RGB565 format via I2C. The image data is transmitted to the MCU via the DVP interface, compressed with JPEG (using the STM32's built-in JPEG encoder), and stored in the RAM buffer, waiting for transmission. The core controller is equipped with a wireless transmission module; Data format: Custom frame structure can be used for transmission, with a frame length of 20 bytes. Transmission logic: The LoRa module adopts a transparent transmission mode. Every "transmission interval" time, the MCU sends a data frame via SPI; the image data is transmitted in packets (each packet is 128 bytes), with the first packet containing a frame header "0xCC0xDD" and the last packet containing an end marker "0xEE0xFF", to ensure that the receiving end can completely splice the data. The core controller is equipped with a fault diagnosis module. Fault types: Four types of faults are detected: motor stall, low battery, abnormal wireless transmission, and current sensor failure; Detection logic: Motor stall: The motor current can be collected by ADC. If the current is >1.5A and lasts for 500ms, it is determined to be stall, the motor is turned off and the red fault light is lit. Low battery: The battery voltage can be collected (connected to the ADC via a voltage divider circuit). If the voltage is <10.8V, a low battery alarm will be triggered (display pop-up window + buzzer sound). Troubleshooting: Fault information is stored in the MCU's RAM and can be viewed via a button. Fault codes (1B, such as 0x01 = motor stall) are also attached during wireless transmission.

[0037] like Figure 10 As shown, the device operation and measurement process is as follows: The first step is equipment deployment: When the staff arrives near the cable at the measurement site, after reaching the target position, they fully extend the telescopic cable and then operate the quick clamp on the side of the casing to clamp and fix the equipment to a nearby stable carrier, thus completing the on-site deployment of the equipment. The second step is parameter setting: The staff sets the corresponding measurement mode (such as continuous measurement, single measurement), telescopic rod extension length and other parameters according to the measurement requirements through the function buttons or touch screen on the front of the casing. After the parameters are set, the main board receives the instruction and prepares to start the measurement process. The third step is telescopic adjustment: After starting the push rod motor, the push rod motor retracts downward to open the current clamp, which is then clamped on the outer wall of the cable for measurement. The staff can view the on-site image transmitted by the camera in real time through the display screen, determine the position of the measuring unit, and fine-tune the length of the telescopic rod by operating the telescopic adjustment key until the ammeter is precisely attached to the measuring point of the cable. During the flexible adjustment process, the ammeter should be kept away from causing torsional damage to the cable. The fourth step is data acquisition and transmission: After the ammeter is attached to the cable, it begins to collect circulating current data. The camera simultaneously captures images of the measurement point and the surrounding environment. Both transmit the data and image signals to the motherboard. After processing by the signal processing module of the motherboard, the circulating current data is displayed in real time on the screen. At the same time, the data and images are remotely transmitted to the back-end terminal through the image transmission module and antenna, realizing dual recording and monitoring of data. The fifth step is measurement completion: After the measurement is completed, the staff issues a retrieval command through the function button or display screen. The push rod motor reverses to drive the telescopic rod to retract. After the measuring unit returns to the initial position, the motor is turned off. Then, the quick clamp and roller brake are released, and the equipment is pushed to the next measuring point or transported to the storage location to complete a single measurement operation.

[0038] In summary, the retractable intelligent cable circulating current measuring device provided in this application, compared with the prior art, includes: a measuring unit for collecting circulating current data and on-site image data of the power transmission cable; a telescopic drive unit for driving the measuring unit to move along the telescopic direction so that the measuring unit can be in close contact with the power transmission cable at a distance; a fixing and moving unit for supporting and moving the retractable intelligent cable circulating current measuring device and fixing it to a stable on-site carrier; a wireless transmission unit for remotely transmitting circulating current data and on-site image data to a back-end terminal; a control unit for controlling the measuring unit to collect data, controlling the telescopic drive unit to move along the telescopic direction, and controlling the wireless transmission unit to transmit data; a power supply unit for providing operating power to the above units; and a housing assembly for providing protection and installation support for the above units.

[0039] By adopting the above technical solution, the telescopic drive unit of this application device can drive the measuring unit to move along the telescopic direction, enabling the measuring unit to collect data by contacting the power transmission cable from a distance. Workers do not need to enter the cable well or climb the tower; they can complete the measurement task from a safe distance, avoiding direct contact with hazardous environments and greatly ensuring personal safety. The telescopic drive unit of this application device can quickly drive the measuring unit to a suitable position for data collection. The fixed and mobile units facilitate rapid movement and fixation of the device on-site, reducing manual operation and on-site dwell time. Simultaneously, the wireless transmission unit can remotely transmit the collected data to the back-end terminal in real time, eliminating the need for manual data transport, further improving work efficiency and meeting the needs of rapid inspection. The fixed and mobile units of this application device are rationally designed, possessing good portability and mobility, adapting to the transportation needs of different terrains, facilitating rapid deployment on outdoor roads or inside cable wells, and improving the applicability of the device in complex on-site environments. The telescopic drive unit of this application device enables the measuring unit to adjust the telescopic distance according to power transmission cables of different diameters, achieving a good fit with the cable. It is convenient and quick to operate, while avoiding potential damage to the cable caused by improper installation and disassembly, and improving the device's adaptability to cables of different specifications.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0041] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A scalable smart cable loop flow measurement device, characterized by, The utility model relates to a kind of telescopic intelligent cable loop current measuring device, including: measurement unit, telescopic drive unit, fixed and mobile unit, control unit, wireless transmission unit, power supply unit and shell assembly, wherein, the measurement unit, the telescopic drive unit, the fixed and mobile unit and the wireless transmission unit are electrically connected with the control unit;The measurement unit is used to collect the loop current data and the field image data of power transmission cable;The telescopic drive unit is used to drive the measurement unit to move along telescopic direction, so that the measurement unit is remotely attached to the power transmission cable;The fixed and mobile unit is used to support and move the telescopic intelligent cable loop current measuring device, and fix the telescopic intelligent cable loop current measuring device on the field stable carrier;The wireless transmission unit is used to remotely transmit the loop current data and the field image data to the background terminal;The control unit is used to control the measurement unit to collect data, and control the telescopic drive unit to move along telescopic direction, and control the wireless transmission unit to transmit data;The power supply unit is used to provide working power for the above units;The shell assembly is used to provide protection and mounting support for the above units. The telescopic drive unit includes a push rod motor and a telescopic rod. One end of the telescopic rod is rigidly connected with the output shaft of the push rod motor, and the other end is fixedly connected with the measurement unit. The push rod motor drives the telescopic rod to extend or retract through forward and reverse rotation to move the measurement unit. The telescopic drive unit further includes a limit protection circuit. The limit protection circuit includes at least two Hall sensors, which are respectively arranged at the telescopic limit positions of the telescopic rod. The Hall sensors are electrically connected with the control unit, and are used to send a trigger signal to the control unit when the telescopic rod reaches the limit position, so that the control unit controls the push rod motor to stop urgently. The measurement unit includes a current sensor, a high-definition camera and a measurement seat. The current sensor is used to collect the loop current data of the power transmission cable.

2. The scalable smart cable loop flow measurement device of claim 1, wherein, The high-definition camera is used to collect the field image data of the power transmission cable. The measurement seat is used to fix the current sensor and the high-definition camera, and is detachably connected with the front end of the telescopic rod. The fixed and mobile unit includes universal wheels and quick clamps.

3. The scalable smart cable loop flow measurement device of claim 2, wherein, The universal wheels are at least four universal wheels with braking function, which are symmetrically arranged at the bottom of the telescopic intelligent cable loop current measuring device to move the telescopic intelligent cable loop current measuring device. The quick clamps are at least two groups of quick clamps, which are arranged on the side of the telescopic intelligent cable loop current measuring device, have elastic clamping structure and anti-slip lining, and are used to clamp and fix the telescopic intelligent cable loop current measuring device on the edge of cable well or tower support to fix the telescopic intelligent cable loop current measuring device. The wireless transmission unit includes a data transmission module, an auxiliary circuit and an omnidirectional high-gain antenna.

4. The scalable smart cable loop flow measurement device of claim 2, wherein, ​ ​ ​ ​ 5. The scalable smart cable loop flow measurement device of claim 1, wherein, ​ ​ ​ 6. The scalable smart cable loop flow measurement device of claim 1, wherein, ​ The data transmission module is configured to transmit the ring current data to a background terminal. The image transmission auxiliary circuit is configured to transmit the live image data to the background terminal. The omnidirectional high-gain antenna is electrically connected to the data transmission module and the image transmission auxiliary circuit, and is configured to enhance signal transmission of the ring current data and the live image data.

7. The scalable smart cable loop current measurement device of claim 4, wherein, The control unit comprises a core controller, a touch display screen, and function buttons. The touch display screen is electrically connected to the core controller, and is configured to receive touch instructions. The function buttons are electrically connected to the core controller, and are configured to receive operation instructions. The core controller is configured to receive the touch instructions from the touch display screen or the operation instructions from the function buttons, output control signals to control the measurement unit to collect data and output control signals to control the telescopic driving unit to move in the telescopic direction according to the touch instructions or the operation instructions, receive and process the ring current data and the live image data from the measurement unit, feed back the processed ring current data and live image data to the touch display screen for display, and control the ring current data and live image data to be transmitted by the wireless transmission unit.

8. The scalable smart cable loop flow measurement device of claim 7, wherein, The core controller is configured with a telescopic control module. The telescopic control module is configured to receive telescopic instructions, wherein the telescopic instructions comprise a speed level. According to the speed level, a target PWM duty cycle is calculated by using a PID algorithm. The target PWM duty cycle signal is output to a motor driving chip of the telescopic driving unit to control the telescopic speed of the telescopic rod. When a trigger signal of a limit sensor is received, the target PWM duty cycle signal is immediately stopped to control the telescopic driving unit to stop urgently.

9. The scalable smart cable loop flow measurement device of claim 7, wherein, The core controller is further configured with a data collection and processing module. The data collection and processing module is configured to collect analog signals from the current sensor by using an integrated ADC module. The ADC values collected multiple times are filtered by using a sliding average algorithm. The filtered ADC values are error-corrected by using a preset calibration formula to obtain actual ring current values. The live image data is JPEG compressed according to the actual ring current values.

10. The scalable smart cable loop flow measurement device of claim 1, wherein, The power supply unit comprises a rechargeable lithium battery and a battery cover plate with an anti-loose buckle. The housing assembly comprises a face shell, a bottom cover, and an acrylic plate. The rechargeable lithium battery is installed in a separate battery compartment inside the housing assembly, and the battery cover plate is used to detachably close the battery compartment. The face shell and the bottom cover are sealingly connected by bolts, and inside the face shell and the bottom cover, mounting stations and wire routing channels of each unit are reserved. The acrylic plate is sealingly embedded in the front end of the face shell.

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