A data acquisition device and method for a power distribution box

Abstract

This invention relates to the field of measuring instrument technology, and more particularly to a data acquisition device and method for a distribution box. The device includes: a non-contact current and voltage acquisition device and a handheld terminal including an image acquisition module, a control module, and a display module. The image acquisition module is used to acquire an installation image containing the installation position of the non-contact current and voltage acquisition device when it is installed on the device under test (DUT) inside the distribution box. The controller is used to acquire the installation image and a pre-stored target image of the DUT marked with the optimal data acquisition position. A feature point matching algorithm is used to determine the transformation relationship between the target image and the installation image, and the distance between the optimal data acquisition position and the installation position is determined based on the transformation relationship. When the distance is not within a preset distance range, the optimal data acquisition position is marked on the installation image. The display module is used to display the installation image marked with the optimal data acquisition position, thereby improving the data acquisition accuracy of the distribution box.

Description

Technical Field

[0001] This invention relates to the field of measuring instrument technology, and in particular to a data acquisition device and method for a power distribution box. Background Technology

[0002] In the field of low-voltage power distribution operation and maintenance, when power maintenance is required, maintenance personnel often need to measure the current and voltage of the internal circuits of the distribution box in order to take appropriate adjustment and handling measures. For example, by measuring the current of the main distribution circuit and branch circuits, they can judge the changes and peak values ​​of the power load and guide the load adjustment in a timely manner.

[0003] Currently, the most commonly used measuring device in low-voltage power distribution sites is the clamp meter. However, clamp meters require clamping the conductor being measured, making it difficult to collect current and voltage data in the confined space of a distribution box. Even when using small sensors, the limited space in the distribution box makes it difficult to determine the sampling location, leading to significant errors in the collected data. Therefore, it is necessary to propose a new data acquisition device suitable for distribution boxes with limited space. Summary of the Invention

[0004] This invention provides a data acquisition device and method for distribution boxes, which improves the accuracy of current and voltage data acquisition from distribution boxes.

[0005] This invention provides a data acquisition device for a power distribution box, comprising: a handheld terminal and a non-contact current and voltage acquisition device; the handheld terminal includes: a controller, an image acquisition module, and a display module;

[0006] The image acquisition module, the display module, and the controller are connected;

[0007] The image acquisition module is used to acquire an installation image including the installation location of the non-contact current and voltage acquisition device when the non-contact current and voltage acquisition device is installed on the device under test in the distribution box.

[0008] The controller is used to acquire the installation image and a pre-stored target image of the device under test, wherein the target image is marked with the optimal data acquisition position; and to use a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and to determine the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device based on the transformation relationship; when the distance is not within a preset distance range, the optimal data acquisition position is marked on the installation image.

[0009] The display module is used to display an installation image with the optimal data acquisition location marked.

[0010] Optionally, the optimal data acquisition position is the position of the conductor centerline of the device under test.

[0011] Optionally, the controller is specifically configured to respond to location information input by the user and acquire a target image of the device under test associated with the location information.

[0012] Optionally, the image acquisition module is used to acquire the original image of the device under test and transmit the original image to the controller;

[0013] The controller is used to mark the position of the conductor centerline of the device under test in the original image to obtain the target image of the device under test, acquire the location information of the device under test, associate the location information of the device under test with the target image, and store the associated location information of the device under test and the target image in the storage module.

[0014] Optionally, the handheld terminal further includes a signal processing module, which is connected to the non-contact current and voltage acquisition device and the controller, respectively, for processing the voltage and current data acquired by the non-contact current and voltage acquisition device and transmitting the processed voltage and current data to the controller.

[0015] Optionally, the handheld terminal further includes a temperature acquisition module;

[0016] The temperature acquisition module is connected to the controller and is used to acquire the ambient temperature of the device under test and transmit the ambient temperature to the controller.

[0017] The controller is used to determine whether the ambient temperature is within a preset temperature threshold range. If so, it outputs a start acquisition signal to the non-contact current and voltage acquisition device to enable the non-contact current and voltage acquisition device to perform acquisition. Otherwise, based on the comparison between the ambient temperature and the preset temperature threshold range, it determines the corresponding target temperature drift compensation model, and inputs the current and voltage data acquired by the non-contact current and voltage acquisition device into the target temperature drift compensation model to obtain the compensated current and voltage data.

[0018] Optionally, the controller is specifically configured to acquire a pre-trained first temperature drift compensation model as the target temperature drift compensation model when the ambient temperature is less than the minimum value of the temperature threshold range.

[0019] Optionally, the controller is specifically configured to, when the ambient temperature exceeds the maximum value of the temperature threshold range, acquire a pre-trained second temperature drift compensation model as the target temperature drift compensation model.

[0020] Optionally, the handheld terminal further includes a communication module;

[0021] The controller is connected to the communication module and, through the communication module, to the server, for uploading data from the storage module to the server.

[0022] Another aspect of the present invention provides a data acquisition method for a distribution box, applied to the device described in any of the preceding claims, the method comprising:

[0023] When the non-contact current and voltage acquisition device is installed on the device under test in the distribution box, the image acquisition device acquires an installation image including the installation location of the non-contact current and voltage acquisition device;

[0024] The controller acquires the installation image and a pre-stored target image of the device under test, the target image being marked with the optimal data acquisition position; and uses a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and determines the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device based on the transformation relationship. When the distance is not within a preset distance range, the optimal data acquisition position is marked on the installation image.

[0025] The display module shows the installation image with the optimal data acquisition location marked.

[0026] As can be seen from the above technical solutions, the present invention has the following advantages:

[0027] This invention provides a data acquisition device for a distribution box, comprising: a handheld terminal and a non-contact current and voltage acquisition device; the handheld terminal includes: a controller, an image acquisition module, and a display module; the image acquisition module and the display module are connected to the controller; the image acquisition module is used to acquire an installation image including the installation position of the non-contact current and voltage acquisition device when the non-contact current and voltage acquisition device is installed on a device under test in the distribution box; the controller is used to acquire the installation image and a pre-stored target image of the device under test, the target image being marked with an optimal data acquisition position; and uses a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and determines the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device based on the transformation relationship, and marks the optimal data acquisition position on the installation image when the distance is not within a preset distance range; the display module is used to display the installation image marked with the optimal data acquisition position.

[0028] In this invention, a non-contact current and voltage acquisition device is used to collect current and voltage data, reducing the installation difficulty of the acquisition device and thus better adapting to the operational requirements of confined distribution boxes. An image acquisition module is used to acquire an installation image containing the installation location of the non-contact current and voltage acquisition device when it is installed on the device under test inside the distribution box. A controller is used to acquire the installation image and a pre-stored target image of the device under test, the target image marking the optimal data acquisition position. A feature point matching algorithm is used to determine the transformation relationship between the target image and the installation image, and based on the transformation relationship, the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device is determined. When the distance is not within a preset distance range... The optimal data acquisition position is marked on the installation image. The display module is used to display the installation image with the marked optimal data acquisition position. This enables the determination of the installation position of the non-contact current and voltage acquisition device. When it is determined that the distance between the installation position of the non-contact current and voltage acquisition device and the optimal data acquisition position is not within a preset distance range, the installation image with the marked optimal data acquisition position is displayed through the display module. This allows maintenance personnel to more accurately adjust the installation position of the non-contact current and voltage acquisition device and install it in the best acquisition position. This enables more accurate current and voltage data acquisition in a small distribution box, avoiding deviations in the installation position of the acquisition device that could lead to large errors in the acquired data, and improving the accuracy of current and voltage data acquisition in the distribution box. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a power distribution box data acquisition device provided in an embodiment of the present invention;

[0031] Figure 2 This is another structural schematic diagram of a data acquisition device for a distribution box provided in an embodiment of the present invention;

[0032] Figure 3 A flowchart illustrating the steps of a data acquisition method for a distribution box provided in an embodiment of the present invention. Detailed Implementation

[0033] This invention provides a data acquisition device and method for a distribution box, which improves the accuracy of current and voltage data acquisition from the distribution box.

[0034] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] Please see Figures 1 to 2 The present invention provides a data acquisition device for a power distribution box, comprising: a handheld terminal 2 and a non-contact current and voltage acquisition device 1; the handheld terminal 2 includes: a controller 21, an image acquisition module 22, and a display module 23; the image acquisition module 22 and the display module 23 are connected to the controller 21;

[0036] The image acquisition module 22 is used to acquire an installation image including the installation position of the non-contact current and voltage acquisition device 1 when the non-contact current and voltage acquisition device 1 is installed on the device under test in the distribution box.

[0037] The controller 21 is used to acquire the installation image and the pre-stored target image of the device under test, with the target image marked with the optimal data acquisition position; and to use a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and to determine the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device 1 based on the transformation relationship. When the distance is not within the preset distance range, the optimal data acquisition position is marked on the installation image; the display module 23 is used to display the installation image with the optimal data acquisition position marked.

[0038] It should be noted that the non-contact current and voltage acquisition device 1 is communicatively connected to the handheld terminal 2 and is used to collect current and voltage data in the distribution box. The non-contact current and voltage acquisition device 1 is a device that can measure current and voltage without direct contact with the conductor being measured. In this embodiment, the non-contact current and voltage acquisition device 1 includes a U-shaped current sensor and a U-shaped voltage sensor, enabling voltage and current measurement without direct contact. This better adapts to the operational needs of distribution boxes with limited space and avoids the safety hazards such as electric shock that exist in existing measurement technologies where the test leads must be in contact with the conductor being measured.

[0039] The optimal data acquisition location indicates the precise location on the device under test where data can be acquired. Feature point matching algorithms are image processing methods used to determine the correspondence between different images; in one example, algorithms such as SIFT, SURF, and ORB could be used.

[0040] In practical use, after the non-contact current and voltage acquisition device 1 is installed on the device under test in the distribution box, the image acquisition module 22 of the handheld terminal 2 acquires an image of the installed non-contact current and voltage acquisition device 1, obtaining an installation image that includes the installation position of the non-contact current and voltage acquisition device 1. The image acquisition module 22 transmits the installation image to the controller 21. The controller 21 receives the installation image and obtains a pre-stored image of the device under test (i.e., the target image) marked with the optimal data acquisition position. Since there may be a shooting angle deviation between the target image and the installation image, in this embodiment, the controller 21 uses a feature point matching algorithm to match the installation image and the target image based on the feature points of the target image and the installation image. Based on the matching result, it determines the transformation relationship between the installation image and the target image, and determines the target position corresponding to the optimal data acquisition position in the installation image based on the transformation relationship. This realizes the determination of the optimal data acquisition position of the device under test in the installation image and reduces the situation of inaccurate image data due to shooting angle deviation.

[0041] After determining the target location, the controller 21 calculates the distance between the target location and the installation location as the optimal distance between the data acquisition location and the installation location. It then determines whether this distance is within a preset distance range. If it is, it indicates that the non-contact current and voltage acquisition device 1 is installed correctly and can accurately acquire current and voltage data. If not, it indicates that the non-contact current and voltage acquisition device 1 is not installed correctly and cannot acquire accurate current and voltage data. Therefore, by marking the optimal data acquisition location on the installation image and displaying the marked optimal data acquisition location on the display module 23, the operator can intuitively determine the installation status of the non-contact current and voltage data acquisition device and its distance from the optimal data acquisition location. This provides a convenient prompt for the operator to adjust the installation location of the non-contact current and voltage acquisition device 1 in a confined space like a distribution box. This allows the operator to more accurately determine the optimal data acquisition location and adjust the installation of the non-contact current and voltage acquisition device 1, thereby improving the accuracy of the current and voltage data acquisition.

[0042] In one specific embodiment, the optimal data acquisition location is the position of the center line of the conductor of the device under test.

[0043] It should be noted that the position of the conductor centerline refers to the location of a virtual straight line at the geometric center of a conductor. The position of the conductor centerline provides a reference for current distribution, a positioning benchmark for the installation and layout of electrical equipment, and a basis for calculating the conductor's magnetic field. Therefore, using the position of the conductor centerline of the device under test as the optimal data acquisition position allows the current and voltage data acquired by the non-contact current and voltage acquisition device 1 to more accurately reflect the true condition of the device under test, thus improving the data acquisition accuracy of the non-contact current and voltage acquisition device 1.

[0044] In one specific embodiment, the controller 21 is specifically configured to respond to location information input by the user and acquire a target image of the device under test associated with the location information.

[0045] It should be noted that in actual use, the staff uses the prompts of the display module 23 to input the location information of the device under test. The display module 23 transmits the location information to the controller 21. Based on the location information of the device under test, the controller 21 obtains the corresponding target image of the device under test from the storage module 26, thereby realizing the accurate acquisition of the target image of the device under test.

[0046] It is understandable that in actual working scenarios, due to the large number of distribution boxes, the storage module 26 stores a large number of images of the devices under test in each distribution box. In this embodiment, by pre-associating location information and target images and storing the association relationship in the storage module 26, the target image of the corresponding device under test can be accurately retrieved based on the location information when the target image needs to be retrieved.

[0047] In one example, by numbering the distribution box and the devices within it, and associating the device numbers, location information, and target images, more accurate target image retrieval can be achieved.

[0048] In one specific embodiment, the image acquisition module 22 is used to acquire the original image of the device under test and transmit the original image to the controller 21;

[0049] The controller 21 is used to mark the position of the conductor center line of the device under test in the original image, obtain the target image of the device under test, acquire the location information of the device under test, associate the location information of the device under test with the target image, and store the associated location information of the device under test and the target image in the storage module 26.

[0050] It should be noted that in the initial stage, the image acquisition module 22 is used to acquire the image (i.e. the original image) of the device under test in the distribution box, and the position of the conductor center line of the device under test is marked in the original image to obtain the target image. The location information of the device under test is obtained, the location information of the device under test and the target image of the device under test are associated, and the association relationship, the location information of the device under test and the target image are stored in the storage module 26, thus realizing the construction and storage of the target image.

[0051] In one specific embodiment, the handheld terminal 2 further includes a signal processing module 24, which is connected to the non-contact current and voltage acquisition device 1 and the controller 21 respectively. The signal processing module 24 is used to process the voltage data and current data acquired by the non-contact current and voltage acquisition device 1 and transmit the processed voltage data and current data to the controller 21.

[0052] It should be noted that signal processing includes filtering, amplification, and analog-to-digital conversion. After receiving the processed voltage and current data, the controller 21 transmits the voltage and current data to the display module 23 for display, so that the staff can intuitively understand the voltage and current data of the device under test.

[0053] In one specific embodiment, the display module 23 may be a touch-enabled display module 23, allowing staff to input text via voice or text. If it has voice functionality, the handheld terminal 2 is equipped with a voice module.

[0054] In one specific embodiment, the handheld terminal 2 further includes a temperature acquisition module 25;

[0055] The temperature acquisition module 25 is connected to the controller 21 and is used to acquire the ambient temperature of the device under test and transmit the ambient temperature to the controller 21.

[0056] The controller 21 is used to determine whether the ambient temperature is within the preset temperature threshold range. If so, it outputs a start acquisition signal to the non-contact current and voltage acquisition device 1 to enable the non-contact current and voltage acquisition device 1 to perform acquisition. Otherwise, based on the comparison result between the ambient temperature and the preset temperature threshold range, it determines the corresponding target temperature drift compensation model, and inputs the current and voltage data acquired by the non-contact current and voltage acquisition device 1 into the target temperature drift compensation model to obtain the compensated current and voltage data.

[0057] It should be noted that the target temperature drift compensation model is a pre-trained model stored in storage module 26. It is used to compensate for temperature drift in the input current and / or voltage data, and outputs the compensated current and / or voltage data. Temperature acquisition module 25 can be a temperature sensor.

[0058] In this embodiment, the temperature acquisition module 25 is used to acquire the ambient temperature of the device under test and to determine whether the ambient temperature is within the preset temperature threshold range. If so, it indicates that the current temperature environment has little interference with the non-contact current and voltage acquisition device 1. At this time, the controller 21 can output a start acquisition signal to the non-contact current and voltage acquisition device 1 to enable the non-contact current and voltage acquisition device 1 to acquire voltage data and / or current data. After that, the signal processing module 24 receives the voltage data and current data acquired by the non-contact current and voltage acquisition device 1, performs signal processing on the voltage data and / or current data, and outputs the processed voltage data and / or current data to the storage module 26 and the display module 23 for storage and display.

[0059] If the ambient temperature is not within the preset temperature threshold range, it indicates that the current ambient temperature of the device under test may interfere with the data accuracy of the non-contact current and voltage acquisition device 1. In this case, by comparing the current ambient temperature with the maximum and minimum values ​​of the temperature threshold range, the corresponding target temperature drift compensation model is determined based on the comparison results. The target temperature drift compensation model is used to perform temperature compensation on the non-contact voltage and current data, avoiding the problem of inaccurate measurement values ​​caused by temperature drift, and further improving the accuracy of the acquired distribution box data.

[0060] In one specific embodiment, the controller 21 is specifically used to acquire a pre-trained first temperature drift compensation model as the target temperature drift compensation model when the ambient temperature is less than the minimum value of the temperature threshold range.

[0061] It should be noted that in this embodiment, a first temperature drift compensation model is pre-built and trained to perform temperature compensation on the current / voltage data collected by the non-contact current / voltage acquisition device 1 in scenarios where the ambient temperature is less than the minimum value of a preset temperature threshold range. The first temperature drift compensation model can be two, used to perform temperature compensation on the current data and voltage data respectively.

[0062] Taking current data as an example, the training steps of the first temperature drift compensation model are as follows: First, construct an environment with a temperature lower than the minimum value of the preset temperature range, and collect the current data of the device under test in this environment as training samples. Then, construct an environment within the preset temperature threshold range, and collect the current data of the device under test in this environment as target samples. Combine multiple sets of training samples and multiple sets of target samples into data pairs, and input the training samples into the initial neural network model to output the predicted compensation value. Calculate the loss value between the target sample and the predicted compensation value, optimize the neural network model through the loss value, and continue the neural network model until it meets the set minimum error. Output the neural network model as the first temperature drift compensation model.

[0063] In one specific embodiment, the controller 21 is specifically configured to, when the ambient temperature exceeds the maximum value of the temperature threshold range, acquire a pre-trained second temperature drift compensation model as the target temperature drift compensation model.

[0064] It should be noted that in this embodiment, a second temperature drift compensation model is pre-built and trained to perform temperature compensation on the current / voltage data collected by the non-contact current / voltage acquisition device 1 in scenarios where the ambient temperature exceeds the maximum value of a preset temperature threshold range. The second temperature drift compensation model can be two in number, used to perform temperature compensation on the current data and voltage data respectively.

[0065] Taking current data as an example, the training steps of the second temperature drift compensation model are as follows: First, construct an environment with a temperature greater than the maximum value of the preset temperature range, and collect the current data of the device under test in this environment as training samples. Then, construct an environment within the preset temperature threshold range, and collect the current data of the device under test in this environment as target samples. Combine multiple sets of training samples and multiple sets of target samples into data pairs, and input the training samples into the initial neural network model to output the predicted compensation value. Calculate the loss value between the target sample and the predicted compensation value, optimize the neural network model through the loss value, and continue the neural network model until it meets the set minimum error. Output the neural network model as the second temperature drift compensation model.

[0066] In another preferred embodiment, a simulation experiment can be constructed, using multiple sets of experimental data collected by non-contact current and voltage acquisition. The temperature compensation coefficient is determined by least-squares fitting of the multiple sets of experimental data. Based on the temperature compensation coefficient, the actual voltage data or actual current data collected by non-contact current and voltage acquisition is determined by temperature drift formula for compensation, thereby obtaining the compensated voltage data and current data to further improve the data acquisition accuracy of the distribution box.

[0067] In a specific implementation, the temperature threshold range can be set according to the standard operating ambient temperature of the non-contact current and voltage acquisition device 1.

[0068] In one specific embodiment, the handheld terminal 2 further includes a communication module;

[0069] The controller 21 is connected to the communication module and, through the communication module, to the server, and is used to upload the data in the storage module 26 to the server.

[0070] It should be noted that the communication module can be either wired or wireless, such as Wi-Fi. The communication module is used to transmit stored data to the server. The server can be a cloud server or a computer terminal.

[0071] In one specific embodiment, a U-shaped current sensor can be used to measure the current value first, or a U-shaped voltage sensor can be used to measure the voltage value first. This embodiment does not specifically limit the measurement order.

[0072] In one specific embodiment, after obtaining the current and voltage values, the controller 21 can also be used to calculate the power using the obtained current and voltage values, and display the current, voltage, and power values ​​on the display module 23.

[0073] In one specific embodiment, the controller 21 is also used to store the location information, current value, voltage value and power of the device under test in the storage module 26, thereby effectively recording the location and measurement values ​​of the device under test, which is convenient for subsequent analysis and use, and avoids the fact that existing commercially available clamp meters do not have data recording capabilities and are difficult to meet the business needs of scenarios such as synchronous measurement of low-voltage distribution area loads.

[0074] In one specific embodiment, the handheld terminal 2 also includes a voice module for providing voice functionality. For example, staff can use the voice module for voice input.

[0075] In one specific embodiment, the storage module 26 is used to store text input by the staff, captured images, data processed by the signal processing module 24, matched image data, etc., providing data support for subsequent analysis.

[0076] In one specific embodiment, the image acquisition module 22 can also be used to acquire the user's facial information, and the controller 21 can be used to perform facial recognition on the facial information and output the recognition result.

[0077] In one application example, the working process of this device can be as follows:

[0078] After arriving at the device under test, the staff enters the location on the display module 23 of the handheld terminal 2. The display module 23 sends the location information to the controller 21. Based on the received location information, the controller 21 retrieves the staff information for the device under test, displays it on the display module 23, and prompts the staff to perform an identity verification operation. After the staff clicks the "Confirm Recognition" option on the display module 23, the controller 21 takes a photo of the staff's face using a camera, sends the photo to the controller 21, and verifies the facial image. If the facial recognition is successful, the controller 21 displays text such as "Passed" on the display module 23 to prompt the staff to perform current and voltage measurements.

[0079] Afterwards, the staff installed the U-shaped current sensor and U-shaped voltage sensor on the device under test. Taking the U-shaped current sensor as an example, inaccurate installation of the U-shaped current sensor and U-shaped voltage sensor can easily lead to inaccurate current and voltage measurements. Therefore, after the U-shaped current sensor is installed on the device under test, the controller 21 displays a prompt message on the display module 23, such as "Take a picture of the installation using a camera" or "Take a picture directly in front of the U-shaped current sensor." Then, the controller 21 acquires the picture of the device taken by the camera and, based on the location information, acquires a pre-stored target image of the device. Since there may be an angular deviation between the image taken by the staff and the pre-stored image, feature point matching algorithms (such as SIFT, SURF, ORB, etc.) are used to match the two images based on feature points (such as corners, intersections, and edge points) to determine the transformation relationship between the two images. Based on the transformation relationship, the target position of the centerline in the captured image (i.e., the installation image) is determined. Then, the controller 21 checks whether the distance between the U-shaped current sensor and the target position is within a preset range. If not, the target position in the captured image is displayed on the display module 23 to instruct the operator to reinstall the sensor. If so, the controller 21 collects the ambient temperature of the environment where the device under test is located via the temperature acquisition module 25. When the ambient temperature is within the preset temperature range, the controller 21 controls the U-shaped current sensor to collect current values. The signal processing module 24 performs corresponding signal processing on the collected current values, stores the processed current values ​​in the storage module 26, and finally displays them together with the voltage values ​​on the display module 23.

[0080] When the ambient temperature is outside the preset temperature threshold range, it indicates that the ambient temperature does not meet the operating environment of the U-shaped current sensor, and temperature drift exists. Therefore, a corresponding temperature drift compensation model is determined based on the ambient temperature. The controller 21 uses the temperature drift compensation model to perform temperature compensation calculations on the current value collected by the U-shaped current sensor, avoiding inaccurate measurement values ​​caused by temperature drift and improving data accuracy. Afterwards, the signal processing module 24 processes the compensated current value accordingly, stores the processed current value in the storage module 26, and finally displays it on the display module 23 along with the voltage value.

[0081] In this invention, the controller acquires an installation image and a pre-stored target image of the device under test. Using a feature point matching algorithm, it determines the transformation relationship between the target image and the installation image. Based on this transformation relationship, it determines the distance between the optimal data acquisition position and the installation position of the non-contact current / voltage acquisition device. When the distance is outside a preset range, the optimal data acquisition position is marked on the installation image. This allows for accurate judgment of the installation position of the U-shaped voltage / current sensor, providing technical support for accurate installation and ensuring the accuracy of voltage and current measurements. It avoids inaccurate voltage and current measurements caused by installation deviations in the U-shaped voltage / current sensor. Furthermore, after confirming correct installation, the ambient temperature is measured, and temperature compensation is applied to the measured values ​​to prevent inaccurate measurements caused by temperature drift. Therefore, the device provided by the present invention first judges and adjusts the installation position of the U-shaped voltage / current sensor, and further judges the environment in which the U-shaped voltage / current sensor is located, thereby avoiding the influence of installation position and temperature on the measurement results of the U-shaped voltage / current sensor, thus improving the accuracy of the measurement results of the U-shaped voltage / current sensor. Therefore, the overall accuracy of data acquisition from the distribution box is improved.

[0082] Please see Figure 3 This invention provides a data acquisition method for a distribution box, applicable to the apparatus of any of the above embodiments, the method comprising:

[0083] 101. When the non-contact current and voltage acquisition device is installed on the device under test in the distribution box, the image acquisition device acquires an installation image including the installation location of the non-contact current and voltage acquisition device.

[0084] 102. The controller acquires the installation image and the pre-stored target image of the device under test, with the optimal data acquisition position marked on the target image. It also uses a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and determines the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device based on the transformation relationship. When the distance is not within the preset distance range, the optimal data acquisition position is marked on the installation image.

[0085] 103. The display module shows the installation image with the optimal data acquisition location marked.

[0086] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0087] In this embodiment, when the non-contact current and voltage acquisition device is installed on the device under test inside the distribution box, the image acquisition device acquires an installation image including the installation position of the non-contact current and voltage acquisition device, and the controller acquires the installation image and a pre-stored target image of the device under test. A feature point matching algorithm is used to determine the transformation relationship between the target image and the installation image. Based on the transformation relationship, the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device is determined. When the distance is not within a preset distance range, the optimal data acquisition position is marked on the installation image, and the display module displays the installation image with the marked optimal data acquisition position. This allows maintenance personnel to more accurately adjust the installation position of the non-contact current and voltage acquisition device, ensuring it is installed in the optimal acquisition position. This achieves more accurate current and voltage data acquisition in the confined space of the distribution box, avoiding deviations in the installation position of the acquisition device that could lead to significant errors in the acquired data, thus improving the accuracy of current and voltage data acquisition in the distribution box.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0090] Furthermore, in the various embodiments of the present invention, the functional units can be integrated into one processing unit, or each functional unit can be a separate physical entity, or two or more functional units can be integrated into one processing unit. The integrated unit described above can be implemented in hardware or as a software functional unit.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0092] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A data acquisition device for a distribution box, characterized in that, include: Handheld terminals and contactless current and voltage acquisition devices; The handheld terminal includes: a controller, an image acquisition module, and a display module; The image acquisition module, the display module, and the controller are connected; The image acquisition module is used to acquire an installation image including the installation location of the non-contact current and voltage acquisition device when the non-contact current and voltage acquisition device is installed on the device under test in the distribution box. The controller is used to acquire the installation image and a pre-stored target image of the device under test, wherein the target image is marked with the optimal data acquisition position; and to use a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and to determine the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device based on the transformation relationship; when the distance is not within a preset distance range, the optimal data acquisition position is marked on the installation image. The display module is used to display an installation image with the optimal data acquisition location marked.

2. The apparatus according to claim 1, characterized in that, The optimal data acquisition position is the position of the conductor centerline of the device under test.

3. The apparatus according to claim 2, characterized in that, The controller is specifically used to respond to location information input by the user and acquire a target image of the device under test associated with the location information.

4. The apparatus according to claim 3, characterized in that, The image acquisition module is used to acquire the original image of the device under test and transmit the original image to the controller; The controller is used to mark the position of the conductor centerline of the device under test in the original image to obtain the target image of the device under test, acquire the location information of the device under test, associate the location information of the device under test with the target image, and store the associated location information of the device under test and the target image in the storage module.

5. The apparatus according to claim 1, characterized in that, The handheld terminal also includes a signal processing module, which is connected to the non-contact current and voltage acquisition device and the controller, respectively. The signal processing module is used to process the voltage and current data acquired by the non-contact current and voltage acquisition device and transmit the processed voltage and current data to the controller.

6. The apparatus according to claim 1, characterized in that, The handheld terminal also includes a temperature acquisition module; The temperature acquisition module is connected to the controller and is used to acquire the ambient temperature of the device under test and transmit the ambient temperature to the controller. The controller is used to determine whether the ambient temperature is within a preset temperature threshold range. If so, it outputs a start acquisition signal to the non-contact current and voltage acquisition device to enable the non-contact current and voltage acquisition device to perform acquisition. Otherwise, based on the comparison between the ambient temperature and the preset temperature threshold range, it determines the corresponding target temperature drift compensation model, and inputs the current and voltage data acquired by the non-contact current and voltage acquisition device into the target temperature drift compensation model to obtain the compensated current and voltage data.

7. The apparatus according to claim 6, characterized in that, The controller is specifically used to acquire a pre-trained first temperature drift compensation model as the target temperature drift compensation model when the ambient temperature is less than the minimum value of the temperature threshold range.

8. The apparatus according to claim 6, characterized in that, Specifically, the controller is used to acquire a pre-trained second temperature drift compensation model as the target temperature drift compensation model when the ambient temperature is greater than the maximum value of the temperature threshold range.

9. The apparatus according to claim 1, characterized in that, The handheld terminal also includes a communication module; The controller is connected to the communication module and, through the communication module, to the server, for uploading data from the storage module to the server.

10. A method for acquiring data from a distribution box, characterized in that, Applied to the apparatus of any one of claims 1-9, the method comprises: When the non-contact current and voltage acquisition device is installed on the device under test in the distribution box, the image acquisition device acquires an installation image including the installation location of the non-contact current and voltage acquisition device; The controller acquires the installation image and a pre-stored target image of the device under test, the target image being marked with the optimal data acquisition position; and uses a feature point matching algorithm to determine the transformation relationship between the target image and the installation image, and determines the distance between the optimal data acquisition position and the installation position of the non-contact current and voltage acquisition device based on the transformation relationship. When the distance is not within a preset distance range, the optimal data acquisition position is marked on the installation image. The display module shows the installation image with the optimal data acquisition location marked.

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