Testing device for loop resistance of power equipment

Abstract

The invention provides a testing device for loop resistance of power equipment, and the device comprises a controller which is connected with a measuring end and an interaction module. The interaction module is used for inputting a corresponding control signal to the controller and displaying a returned test result in real time; the measuring end is connected with a loop of power equipment needing to be tested and is used for outputting a corresponding test current value to the loop of the power equipment according to a control instruction output by the controller and measuring test parameters of the loop of the power equipment at a corresponding moment; and the controller is used for generating a corresponding test instruction according to the received control signal, controlling the measuring end to execute a corresponding test action according to the test instruction, and calculating a corresponding resistance value according to a test parameter measured and returned by the measuring end. According to the method, isolated points are analyzed through the curve graph resistance value, and meanwhile, the influence of temperature on a test result is considered, so that an analysis result displayed by a display is more accurate and efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation, and particularly to a test device for the loop resistance of power equipment. Background Art

[0002] With the continuous evolution of the power system, its complexity and scale are increasing day by day, which puts higher requirements on the reliability and performance of grid equipment. Although traditional loop resistance testers can calculate the corresponding resistance values under different currents, they do not consider the influence of various environmental factors on the resistance value results. At the same time, existing loop resistance testers cannot analyze different resistance values. Summary of the Invention

[0003] The object of the present invention is to provide a test device for the loop resistance of power equipment to solve the technical problem of how to accurately measure the loop resistance.

[0004] On the one hand, a test device for the loop resistance of power equipment is provided, including:

[0005] A controller, which is respectively connected to a measurement end and an interaction module;

[0006] The interaction module is used to input corresponding control signals to the controller and display the test results returned by the controller in real time;

[0007] The measurement end is connected to the loop of the power equipment to be tested, and is used to output corresponding test current values to the loop of the power equipment according to the control instructions output by the controller, and measure the test parameters of the loop of the power equipment at the corresponding moment; wherein, the test parameters at least include voltage value and current room temperature;

[0008] The controller is used to generate corresponding test instructions according to the received control signals, control the measurement end to perform corresponding test actions according to the test instructions, and calculate the corresponding resistance values according to the test parameters measured and returned by the measurement end.

[0009] Preferably, it further includes a memory for storing the names of power equipment, corresponding working modes, and the corresponding relationships between each power equipment and its working mode; wherein, the working mode is the current value range corresponding to the operation of the power equipment.

[0010] Preferably, the controller is specifically used to, when generating a test instruction, obtain the working mode of the power equipment, and randomly select multiple test current values in the working mode; output the working mode and the multiple test current values as test information to the measurement end.

[0011] Preferably, the measurement end at least includes a temperature sensor for collecting current room temperature information, and a voltage measurement module for measuring voltage information in the circuit of the power equipment.

[0012] Preferably, the measurement end is specifically configured to sequentially output corresponding test current values to the power equipment according to the received test information, record the current time information, measure the room temperature and voltage values at the current time, and output them as test parameters.

[0013] Preferably, the controller is further configured to perform spectral analysis on the calculated resistance value and its corresponding test current value, perform curve fitting with the resistance value and the test current value as the abscissa and ordinate, and if there are isolated points on the curve, it is determined that there is an abnormality in the loop resistance at the test current value corresponding to the isolated points.

[0014] Preferably, the controller is further configured to use the resistance value at the first moment as a basis to determine the difference between its resistance value and the resistance value at the moment corresponding to the isolated point, obtaining the current change amount; and calculate the corresponding expected change amount of the resistance value according to the current change amount.

[0015] Preferably, the expected change amount of the resistance value is the product of the current change amount, the preset resistance temperature coefficient, and the resistance value at the first moment.

[0016] Preferably, the controller is further configured to determine the difference between the expected change amount of the resistance value and the current change amount. If the difference is within the preset range, it is determined that the abnormal numerical change corresponding to the isolated point is a measurement error caused by temperature, and the isolated point is not abnormal information; if the difference is not within the preset range, it is determined that the abnormal numerical change corresponding to the isolated point is not a measurement error caused by temperature, and the isolated point is abnormal information.

[0017] Preferably, the controller is further configured to output the test parameters, the spectral analysis result, the current change amount, the expected change amount of the resistance value, and the abnormal information as test results to the interaction module for display.

[0018] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0019] The test device for the loop resistance of the power equipment provided by the present invention tests by simulating the real working mode of the device, without manually adjusting the test current value, ensuring the accuracy of the test. By analyzing the isolated points through the resistance value curve, and considering the influence of temperature on the test result, the expected change amount of the resistance value is obtained by using the temperature change, and the authenticity of the abnormality of the isolated point is determined through the expected change amount of the resistance value, making the analysis result displayed on the display more accurate and efficient. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present invention.

[0021] Figure 1 It is a schematic diagram of a test device for the loop resistance of a power device in an embodiment of the present invention. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the present invention in detail with reference to the drawings.

[0023] As Figure 1 shown, it is a schematic diagram of an embodiment of a test device for the loop resistance of a power device provided by the present invention. In this embodiment, it includes:

[0024] A controller, the controller is respectively connected to a measurement end and an interaction module; the interaction module is used to input corresponding control signals to the controller and display the test results returned by the controller in real time; the measurement end is connected to the loop of the power device to be tested, and is used to output a corresponding test current value to the loop of the power device according to the control instruction output by the controller, and measure the test parameters of the loop of the power device at the corresponding moment; wherein, the test parameters at least include a voltage value and the current room temperature; the controller is used to generate corresponding test instructions according to the received control signals, control the measurement end to perform corresponding test actions according to the test instructions, and calculate the corresponding resistance value according to the test parameters measured and returned by the measurement end. It can be understood that a controller is provided, and the controller is connected to a display device, which can be a wired or wireless communication connection. There are at least temperature sensors, voltage measurement sensors, etc. installed near the measurement end. When it is necessary to test the loop resistance of a power device (such as various switch devices), first input the device name of the power device through the display device. The controller receives the device name and determines its corresponding working mode in the memory. After determining the working mode of the power device, connect the power device and the loop resistance tester according to the installation rules. The controller randomly selects multiple test current values in the working mode according to the number of test points.

[0025] It should be noted that through a more precise design of its internal structure, the device presents a small, delicate, compact and portable effect. By carefully adjusting and optimizing the volume and weight, it can be easily held and operated with one hand. Whether in a narrow working space or an outdoor environment, this compact design can provide great convenience for users. In addition to the compact and portable design, its advantage also lies in its intelligent current application function. The instrument can automatically start from a lower current gear and gradually increase to a higher gear, ensuring that the current during the test increases gradually, so as to more accurately simulate the resistance change under actual working conditions. In addition, it can record and display in real time the graph of the resistance value changing with the current. Whether it is a curve graph or a bar graph, it can intuitively show the change trend of the resistance value at different currents. It also has a built-in intelligent circuit protection function, which can protect the output current power in real time, effectively avoid the impact of battery overload and excessive current on the chip, greatly reduce the failure rate, and improve the durability and reliability of the device. To further improve the user experience, the tester also incorporates advanced voice control and interaction technologies. Users can easily control the test by simply giving voice commands, which greatly improves the convenience and flexibility of operation.

[0026] An embodiment further includes a memory for storing the names of power devices, the corresponding working modes, and the corresponding relationships between each power device and its working mode; wherein, the working mode is the current value range corresponding to the power device when it is working. Among them, the corresponding relationships between each power device and its working mode are pre-stored in the controller. The working mode refers to the current value range corresponding to the power device when it is working. For example, 0 - 50A.

[0027] In an embodiment, the controller is specifically configured to, when generating a test instruction, obtain the working mode of the power device and randomly select multiple test current values within this working mode; output the working mode and the multiple test current values as test information to the measurement end. The number of points of the test current values is preset by the staff. For example, select four test current values of 0A, 10A, 20A, and 30A.

[0028] Start the test. Assume there are 5 test current values. Control the current to flow into the power equipment in sequence according to the magnitude of the test current values to perform a loop resistance test on the power equipment. When the first test current value flows into the power equipment, collect the current room temperature through the temperature sensor and record it as T1. And measure the voltage of the power equipment through the voltmeter, and calculate the corresponding first resistance value according to the current and voltage. When the second test current value flows into the power equipment, collect the current room temperature through the temperature sensor and record it as T2. Then measure the voltage of the power equipment through the voltmeter, and calculate the corresponding second resistance value according to the current and voltage. When the third test current value flows into the power equipment, collect the current room temperature through the temperature sensor and record it as T3. Then measure the voltage of the power equipment through the voltmeter, and calculate the corresponding third resistance value according to the current and voltage. When the fourth test current value flows into the power equipment, collect the current room temperature through the temperature sensor and record it as T4. Then measure the voltage of the power equipment through the voltmeter, and calculate the corresponding fourth resistance value according to the current and voltage. When the fifth test current value flows into the power equipment, collect the current room temperature through the temperature sensor and record it as T5. Then measure the voltage of the power equipment through the voltmeter, and calculate the corresponding fifth resistance value according to the current and voltage.

[0029] In one embodiment, the controller is further configured to perform spectral analysis on the calculated resistance value and its corresponding test current value, perform curve fitting with the resistance value and the test current value as the abscissa and ordinate respectively. If there are isolated points on the curve, it is determined that there is an abnormality in the loop resistance at the test current value corresponding to the isolated point. It can be understood that then perform spectral analysis (such as a curve graph) on the first resistance value, the second resistance value, the third resistance value, the fourth resistance value, and the fifth resistance value in combination with their corresponding currents. Taking the curve graph as an example, if curve fitting is performed with the resistance value and the current as the abscissa and ordinate respectively, then the points isolated from the curve are isolated points, indicating that there is an abnormality in the loop resistance at the current corresponding to the isolated point, and display the abnormal information to the staff on the display.

[0030] In one embodiment, the controller is further configured to, based on the resistance value at the first moment, determine the difference between it and the resistance value at the moment corresponding to the isolated point to obtain the current change amount; and calculate the corresponding expected resistance value change amount according to the current change amount. The expected resistance value change amount is the product of the current change amount, the preset resistance temperature coefficient, and the resistance value at the first moment. It can be understood that since the change in temperature will affect the resistance value measured by the loop resistance tester, it is easy to obtain an incorrect resistance value analysis report. To avoid incorrect analysis results caused by temperature effects, use the first resistance value detected for the first time as a basis to measure whether the deviation of the resistance values in subsequent multiple measurements is caused by temperature.

[0031] Therefore, after determining the isolated point, taking the second resistance value as the isolated point as an example, first subtract the second resistance value from the first resistance value to obtain the current change amount. Then calculate the expected change amount of the resistance value.

[0032] Expected change amount of resistance value = (T2 - T1) * resistance temperature coefficient * first resistance value

[0033] Among them, for resistors of different materials, their corresponding resistance temperature coefficients (TCR) are different. For example, the TCR of copper is about 3900 ppm / °C.

[0034] In one embodiment, the controller is further configured to determine the difference between the expected change amount of the resistance value and the current change amount. If the difference is within a preset range, it is determined that the abnormal numerical change corresponding to the isolated point is a measurement error caused by temperature, and this isolated point is not abnormal information; if the difference is not within the preset range, it is determined that the abnormal numerical change corresponding to the isolated point is not a measurement error caused by temperature, and this isolated point is abnormal information. It can be understood that by calculating the difference between the expected change amount of the resistance value and the current change amount, if the difference is within the preset range, it means that the abnormal numerical change of the second resistance value is a measurement error of the loop resistance tester caused by temperature, and this isolated point is not abnormal information. If the difference is not within the preset range, it means that the abnormal numerical change of the second resistance value is not a measurement error of the loop resistance tester caused by temperature, and this isolated point is indeed abnormal information. The preset range is set according to the experience of the staff.

[0035] In one embodiment, the controller is further configured to output the test parameters, the spectrum analysis result, the current change amount, the expected change amount of the resistance value, and the abnormal information as test results to the interaction module for display.

[0036] In one embodiment, the measurement end at least includes a temperature sensor for collecting the current room temperature information, and a voltage measurement module for measuring the voltage information in the loop of the power equipment. The measurement end is specifically configured to sequentially output corresponding test current values to the power equipment according to the received test information, record the current time information, measure the room temperature and voltage value at the current time, and output them as test parameters. After determining the isolated point, display the loop resistance measurement result of the power equipment on the display and display the abnormal information. If other resistance values are isolated points, the above method is also used to make a judgment using the first resistance value.

[0037] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0038] The test device for the loop resistance of power equipment provided by the present invention simulates the real working mode of the equipment for testing, without manually adjusting the test current value, ensuring the accuracy of the test. Isolated points are analyzed through the resistance values in the curve graph. At the same time, considering the influence of temperature on the test results, the expected change amount of the resistance value is obtained by using the temperature change, and the authenticity of the abnormality of the isolated point is determined through the expected change amount of the resistance value, making the analysis result displayed on the display more accurate and efficient.

[0039] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A test device for the loop resistance of an electric power device, characterized in that: include: A controller, wherein the controller is connected to the measuring end and the interaction module respectively; The interactive module is used to input corresponding control signals to the controller and display the test results returned by the controller in real time; The measuring end is connected to the circuit of the electric device to be tested, and is used to output the corresponding test current value to the circuit of the electric device according to the control instruction output by the controller, and measure the test parameters of the circuit of the electric device at the corresponding moment; wherein the test parameters at least include the voltage value and the current room temperature; The controller is used to generate a corresponding test instruction according to the received control signal, and control the measuring end to perform a corresponding test action according to the test instruction, and calculate a corresponding resistance value according to the test parameters measured and returned by the measuring end.

2. The device according to claim 1, characterized in that It also includes a memory for storing the name of the power equipment, the corresponding working mode and the corresponding relationship between each power equipment and its working mode; wherein the working mode is the current value range corresponding to the power equipment when it is working.

3. The device according to claim 2, characterized in that The controller is specifically used to, when generating a test instruction, obtain the working mode of the power equipment and randomly select multiple test current values ​​in the working mode; and output the working mode and the multiple test current values ​​as test information to the measuring end.

4. The device according to claim 3, characterized in that The measuring end includes at least a temperature sensor for collecting current room temperature information and a voltage measuring module for measuring voltage information in a circuit of the power equipment.

5. The device according to claim 4, characterized in that The measuring end is specifically used to output corresponding test current values ​​to the power equipment in sequence according to the received test information, record the current time information, measure the room temperature and voltage value at the current time, and output them as test parameters.

6. The device according to claim 5, characterized in that The controller is also used to perform a spectrum analysis on the calculated resistance value and its corresponding test current value, and to perform curve fitting with the resistance value and the test current value as the horizontal axis and the vertical axis. If there is an isolated point of the curve, it is determined that the loop resistance is abnormal under the test current value corresponding to the isolated point.

7. The device according to claim 6, characterized in that The controller is also used to determine the difference between the resistance value at the first moment and the resistance value at the corresponding moment of the isolated point based on the resistance value at the first moment to obtain the current change; and calculate the corresponding expected change of the resistance value according to the current change.

8. The device according to claim 7, characterized in that The expected change in resistance value is the product of the current change, the preset resistance temperature coefficient, and the resistance value at the first moment.

9. The device according to claim 7, characterized in that The controller is also used to determine the difference between the expected change in resistance value and the current change in resistance value, and if the difference is within a preset range, it is determined that the abnormal value change corresponding to the isolated point is a measurement error caused by temperature, and the isolated point is not abnormal information; If the difference is not within the preset range, it is determined that the abnormal value change corresponding to the isolated point is not a measurement error caused by temperature, and the isolated point is abnormal information.

10. The device according to claim 9, characterized in that The controller is also used to output the test parameters, the spectrum analysis results, the current change, the expected change of the resistance value and the abnormal information as the test results to the interactive module for display.

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