Line detection method, device and equipment based on direct current signal test and medium

Abstract

The application discloses a line detection method, device and equipment based on direct current signal test sending and a medium, and the method comprises the following steps: obtaining the operation parameters of a to-be-detected power distribution line, and obtaining a direct current test signal parameter set of the to-be-detected power distribution line according to the operation parameters; wherein the direct current test signal parameter set comprises a target voltage value, a target current value, a pulse width and a repetition period; controlling a direct current signal source according to the direct current test signal parameter set, so as to test the direct current signal to the to-be-detected power distribution line, and collecting a line direct current response data set in the test process; performing power distribution line state analysis according to the line direct current response data set, and obtaining a line detection result; wherein the power distribution line state analysis comprises line insulation state analysis and electrical performance analysis. The application can improve the reliability of the power distribution line detection result through automatic direct current signal test sending.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution network operation and maintenance, and particularly relates to a line detection method and device based on direct current signal test sending, equipment and medium. BACKGROUND

[0002] The safety and stability of the distribution line are crucial for the reliable operation of the power system. During the maintenance of the distribution system, line testing and detection are often required to ensure that the line can work safely and stably in actual operation. The existing distribution line detection method mainly evaluates the performance of the line through regular inspection and testing, usually including insulation detection, electrical performance detection, etc. The testing method generally uses a single direct current voltage or alternating current voltage method, that is, the insulation and electrical performance of the line are judged by detecting voltage and current. In addition, some traditional detection methods also combine environmental factors such as temperature and humidity for basic evaluation. These methods can ensure the safety of the distribution line to some extent, but due to the traditional testing method, which relies on manual operation and single testing parameter, it is difficult to adapt to complex operating environments and real-time changes in line state.

[0003] At present, the existing technology has the following problems: the existing distribution line testing method usually relies on fixed testing parameters and standards for evaluation, lacks dynamic adjustment for the actual line operating state, especially under real-time environmental and system load fluctuations, it is difficult to provide accurate safety evaluation. In the prior art, testing is mainly concentrated in the design stage of the line, and the dynamic response of the line under different environmental conditions, such as temperature changes and actual load changes, is not fully considered, which can lead to a mismatch between the test results and the actual operating state of the line. SUMMARY

[0004] The present application provides a line detection method, device, equipment and medium based on direct current signal test sending, which can improve the reliability of the distribution line detection result through automatic direct current signal test sending.

[0005] In a first aspect, the present application provides a line detection method based on direct current signal test sending, comprising:

[0006] Obtaining the operating parameters of the to-be-tested distribution line, and obtaining the direct current test signal parameter set of the to-be-tested distribution line according to the operating parameters; wherein the direct current test signal parameter set includes a target voltage value, a target current value, a pulse width and a repetition period;

[0007] According to the direct current test signal parameter set, a direct current signal source is controlled to test the direct current signal to the to-be-tested distribution line, and a line direct current response data set is collected during the test process; wherein the line direct current response data set includes voltage values, current values and leakage current values at a plurality of time points;

[0008] According to the line DC response data set, the power distribution line state analysis is performed to obtain a line detection result; wherein, the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

[0009] The embodiment of the present application can avoid the problem of mismatching between the fixed parameters and the actual line working condition in the prior art by obtaining the DC test signal parameter set according to the operating parameters, so that the test signal is matched with the actual line state from the source, laying a foundation for subsequent accurate detection; by controlling the DC signal source to test the DC signal according to the DC test signal parameter set, the line DC response data set is collected in the test process, so that the signal is injected according to the adaptive parameters, which can ensure that the signal strength is sufficient to stimulate the line response and does not overload and damage the line, and the multi-dimensional data at multiple time points is collected, which can capture the real-time dynamic changes of the line response and avoid detection deviation caused by the contingency of single data; by performing power distribution line state analysis according to the response data set, the detection result is obtained, wherein, insulation fault and electrical performance decline are the core fault types of the power distribution line, and double-dimensional analysis can cover the main risk points of the line, avoid missing transmission performance problems in single dimension, and ensure the comprehensiveness of the state evaluation. The embodiment of the present application solves the problems of mismatching between fixed parameters and actual conditions, one-sided data collection and single state evaluation in the prior art through the closed-loop process from dynamically adaptive test parameters to accurate collection of dynamic response to comprehensive double-dimensional analysis, wherein, the dynamic parameters ensure that the test signal matches the line working condition, avoiding detection distortion caused by improper signal; multi-dimensional dynamic data provides sufficient basis for analysis, reducing data contingency error; double analysis of insulation state and electrical performance covers the core fault types, avoiding missing risks, and finally realizing comprehensive and accurate evaluation of the state of the power distribution line, significantly improving the detection reliability. Compared with the prior art, the present application can improve the reliability of the power distribution line detection result through automatic DC signal testing.

[0010] Further, the operating parameters of the to-be-tested power distribution line are obtained, and the DC test signal parameter set of the to-be-tested power distribution line is obtained according to the operating parameters, including:

[0011] The voltage coefficient and the corresponding line rated voltage value of the to-be-tested power distribution line are obtained, and the preliminary target voltage value of the to-be-tested power distribution line is calculated according to the voltage coefficient and the line rated voltage value;

[0012] The pre-stored environmental temperature reference value and temperature correction coefficient are obtained, and the preliminary target voltage value is corrected according to the environmental temperature reference value and the temperature correction coefficient to obtain the target voltage value.

[0013] The embodiment of the present application corrects the basic characteristics by the voltage coefficient and compensates the environmental influence by the temperature correction, so that the target voltage is not only consistent with the inherent electrical properties of the line, but also adapts to the real-time environmental conditions, solving the problem that the voltage parameters are inaccurate due to the neglect of environmental temperature and actual characteristics of the line in the prior art. The accurate target voltage can ensure that the test signal can effectively stimulate the line response and will not damage the line due to too high voltage or cause weak response due to too low voltage, providing guarantee for the effectiveness of subsequent data collection and further improving the detection reliability.

[0014] Further, the operation parameters of the to-be-tested power distribution line are acquired, and a direct-current test signal parameter set of the to-be-tested power distribution line is acquired according to the operation parameters, including:

[0015] The line impedance value of the to-be-tested power distribution line is acquired, and a preliminary theoretical current value is calculated according to the line impedance value and the target voltage value;

[0016] The preliminary theoretical current value is corrected according to the preset line-to-ground electromagnetic field and line-to-ground capacitance parameters to obtain a theoretical target current value;

[0017] The safety factor and the corresponding rated current value of the to-be-tested power distribution line are acquired, and an allowed test current value is calculated according to the safety factor and the rated current value;

[0018] The theoretical target current value and the allowed test current value are compared, and the smaller value is taken as the target current value of the to-be-tested power distribution line.

[0019] The embodiment of the present application corrects the theoretical current by multiple parameters and uses the calculation logic of the safety upper limit constraint, so that the target current is consistent with the real electrical environment of the line and is strictly controlled within the safety range, solving the problem that the current parameter in the prior art only considers the basic Ohm's law and ignores the actual interference and safety redundancy. The accurate and safe target current can ensure that the line is not damaged during the test process, and clear response data can be collected, avoiding invalid detection or line failure caused by improper current, improving the safety and data effectiveness of detection, and guaranteeing the reliability.

[0020] Further, the operation parameters of the to-be-tested power distribution line are acquired, and a direct-current test signal parameter set of the to-be-tested power distribution line is acquired according to the operation parameters, including:

[0021] The line inductance and the corresponding line impedance value of the to-be-tested power distribution line are acquired, and a charge-discharge time constant is calculated according to the line inductance and the line impedance value;

[0022] The pulse width initial value is calculated according to the charge-discharge time constant, and the pulse width initial value is corrected according to the preset temperature correction coefficient and the environmental temperature reference value to obtain the pulse width.

[0023] The embodiment of the present application solves the problems of fixed pulse width, ignoring inherent characteristics of the line and temperature influence in the prior art by calculating the time constant based on the inherent parameters of the line and adapting to the environment by temperature correction, so that the pulse width is highly matched with the charging and discharging speed of the line.

[0024] Further, the operation parameters of the to-be-tested power distribution line are acquired, and a direct-current test signal parameter set of the to-be-tested power distribution line is acquired according to the operation parameters, including:

[0025] The line electrical response time length and the corresponding pulse width of the to-be-tested power distribution line are acquired, and the line electrical response time length and the pulse width are compared, and the larger value is taken as a cycle calculation reference;

[0026] The repetition cycle initial value is calculated according to the cycle calculation reference, and the repetition cycle initial value is corrected through the real-time collected environmental temperature to obtain the repetition cycle.

[0027] The embodiment of the present application solves the problem of signal superposition caused by fixed repetition cycle in the prior art by taking the response integrity as the reference and combining the real-time temperature correction, so that the repetition cycle ensures the independent and complete response of each pulse.

[0028] Further, the line state analysis is performed according to the line direct-current response data set to obtain a line detection result, including:

[0029] The peak value and the average value of the leakage current are calculated according to the leakage current values of the plurality of time points in the line direct-current response data set.

[0030] If the peak value is greater than a preset maximum allowable leakage current value or the average value is greater than a preset percentage reference, it is determined that the line insulation state of the to-be-tested power distribution line is unqualified, otherwise, the electrical performance analysis is performed according to the current values and the voltage values of the plurality of time points in the line direct-current response data set.

[0031] The embodiment of the present application realizes comprehensive and accurate determination of the insulation state of the line by means of double-index calculation of multi-time-point data, and solves the problem of insulation detection depending on a single value and ignoring potential risks in the prior art. The double index of peak value and average value covers the instantaneous and long-term insulation state, accurate insulation state determination can identify insulation faults and potential risks in time, provide a clear direction for line safety investigation, and ensure that subsequent electrical performance analysis is only carried out on the premise of qualified insulation, thereby improving the effectiveness and reliability of the overall detection.

[0032] Further, according to the current value and the voltage value of the plurality of time points in the line direct current response data set, electrical performance analysis is performed, specifically:

[0033] According to the current value and the voltage value of the plurality of time points in the line direct current response data set, the signal attenuation rate of the current signal is calculated.

[0034] If the signal attenuation rate is greater than a preset signal attenuation threshold, it is determined that the electrical performance of the power distribution line to be tested is unqualified.

[0035] The embodiment of the present application realizes objective and accurate determination of the electrical performance of the line by means of multi-time-point data quantization of the attenuation rate combined with threshold comparison, and solves the problem of subjectivity and unquantification of electrical performance detection in the prior art. The quantitative calculation of the attenuation rate can clearly reflect the change of the transmission capacity of the line, and avoid the error of single value judgment of voltage or current; the threshold comparison ensures the uniformity of the determination standard and reduces the interference of human factors. The electrical performance analysis can find potential problems of insulation qualification but transmission performance decline, supplement the deficiency of insulation analysis, realize comprehensive evaluation of the line state, and further improve the detection reliability.

[0036] In a second aspect, the embodiment of the present application provides a line detection device based on direct current signal test sending, comprising a parameter acquisition module, a response data acquisition module and a detection result acquisition module, wherein,

[0037] The parameter acquisition module is configured to acquire the operating parameters of the power distribution line to be tested, and acquire a direct current test signal parameter set of the power distribution line to be tested according to the operating parameters; wherein the direct current test signal parameter set comprises a target voltage value, a target current value, a pulse width and a repetition period.

[0038] The response data acquisition module is configured to control a direct current signal source according to the direct current test signal parameter set to test send a direct current signal to the power distribution line to be tested, and acquire a line direct current response data set during the test sending process; wherein the line direct current response data set comprises voltage values, current values and leakage current values of a plurality of time points.

[0039] The detection result acquisition module is configured to perform power distribution line state analysis according to the line DC response data set to obtain line detection results; wherein the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

[0040] The parameter acquisition module according to the present embodiment obtains a DC test signal parameter set according to the operating parameters, which can avoid the problem of mismatch between the fixed parameters and the actual line working conditions in the prior art, and makes the test signal conform to the actual line state from the source, laying a foundation for subsequent accurate detection; the response data acquisition module controls the DC signal source to test the DC signal according to the DC test signal parameter set, so as to collect the line DC response data set during the test process, so that the signal is injected according to the adaptive parameters, which can ensure that the signal strength is sufficient to stimulate the line response and does not overload and damage the line, and the multi-dimensional data at multiple time points can capture the real-time dynamic changes of the line response, avoiding detection deviation caused by the contingency of single data; the detection result acquisition module performs power distribution line state analysis according to the response data set to obtain the detection results, wherein insulation failure and electrical performance decline are the core fault types of the power distribution line, and double-dimensional analysis can cover the main risk points of the line, avoid missing transmission performance problems in a single dimension, and ensure the comprehensiveness and reliability of the state evaluation.

[0041] In a third aspect, the present embodiment provides a terminal device, comprising: a processor, a memory, a communication interface and a communication bus, the processor, the memory and the communication interface complete communication with each other through the communication bus;

[0042] The memory is used to store at least one executable instruction, and the executable instruction makes the processor execute the operations of the line detection method based on the DC signal test according to any one of the above.

[0043] In a fourth aspect, the present embodiment provides a computer readable storage medium, which comprises a stored computer program, wherein when the computer program runs, the computer readable storage medium controls the device or apparatus where the computer readable storage medium is located to execute the line detection method based on the DC signal test according to any one of the above.

[0044] The above description is only a summary of the technical solutions of the present embodiment, in order to more clearly understand the technical means of the present embodiment, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present embodiment more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A line detection method based on DC signal test provided by the present embodiment is shown in the figure;

[0046] Figure 2 A structural diagram of a line testing device based on DC signal testing is provided in an embodiment of the present invention;

[0047] Figure 3 This is a structural diagram of another line testing device based on DC signal testing provided in an embodiment of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1:

[0050] like Figure 1 As shown, an embodiment of the present invention provides a line detection method based on DC signal testing, comprising the following steps:

[0051] S101, obtain the operating parameters of the power distribution line under test, and obtain the DC test signal parameter set of the power distribution line under test according to the operating parameters; wherein, the DC test signal parameter set includes target voltage value, target current value, pulse width and repetition period;

[0052] In this embodiment, the step of acquiring the operating parameters of the distribution line under test and acquiring the DC test signal parameter set of the distribution line under test based on the operating parameters includes: acquiring the voltage coefficient and the corresponding rated voltage value of the distribution line under test, and calculating the preliminary target voltage value of the distribution line under test based on the voltage coefficient and the rated voltage value of the line; acquiring the pre-stored ambient temperature reference value and temperature correction coefficient, and correcting the preliminary target voltage value based on the ambient temperature reference value and the temperature correction coefficient to obtain the target voltage value.

[0053] In one specific embodiment, the specific steps for analyzing the target voltage of the distribution line under test are as follows: The voltage coefficient of the distribution line under test is obtained and multiplied with the corresponding rated voltage value of the line to obtain the preliminary target voltage value of the distribution line under test. The voltage coefficient is preset by the system and is used to correct the rated voltage value of the line to conform to changes in environmental factors. Typically, the voltage coefficient is obtained through experimental data or industry standards, and the voltage is adjusted according to the actual ambient temperature. The voltage coefficient is usually stored in the system database and can be dynamically read according to environmental conditions when needed. The preliminary target voltage value is then combined with the ambient temperature value for correction analysis to obtain the target voltage of the distribution line under test.

[0054] The specific formula for calculating the target voltage is as follows:

[0055]

[0056] In the formula, , , , The target voltage of the to-be-tested power distribution line, the preliminary target voltage value, the ambient temperature value, and the ambient temperature reference value are sequentially obtained. The temperature correction coefficient stored in the database is 0.05 in this embodiment.

[0057] In this embodiment, the operating parameters of the to-be-tested power distribution line are obtained, and the DC test signal parameter set of the to-be-tested power distribution line is obtained according to the operating parameters. Specifically, the line impedance value of the to-be-tested power distribution line is obtained, and a preliminary theoretical current value is calculated according to the line impedance value and the target voltage value. The preliminary theoretical current value is corrected according to the preset line-to-ground electromagnetic field and line-to-ground capacitance parameters to obtain a theoretical target current value. The safety factor of the to-be-tested power distribution line and the corresponding rated current value are obtained, and an allowed test current value is calculated according to the safety factor and the rated current value. The theoretical target current value and the allowed test current value are compared, and the smaller value is taken as the target current value of the to-be-tested power distribution line.

[0058] In a specific embodiment, the specific steps of analyzing the target current of the to-be-tested power distribution line are as follows: the target voltage value and the line impedance value of the to-be-tested power distribution line, the line-to-ground electromagnetic field, and the line-to-ground capacitance parameters are read, and division analysis is performed to obtain the corresponding theoretical target current value. The safety factor of the to-be-tested power distribution line is obtained, and multiplication analysis is performed in combination with the corresponding rated current value to obtain the corresponding allowed test current value. The theoretical target current value is compared, and the smaller value is taken as the target current of the to-be-tested power distribution line. The safety factor is determined according to the line design and safety standards to ensure that the current does not exceed the safety carrying range of the line or equipment during the test process. The safety factor is usually determined by the design standards of the equipment and the expected use environment. In actual application, the coefficient is generally stored in the equipment parameter database and adjusted according to different test requirements.

[0059] In the embodiment, the operation parameter of the to-be-tested power distribution line is acquired, and a direct current test signal parameter set of the to-be-tested power distribution line is acquired according to the operation parameter, including: acquiring a line inductance of the to-be-tested power distribution line and a corresponding line impedance value, and calculating a charge-discharge time constant according to the line inductance and the line impedance value; calculating a pulse width initial value according to the charge-discharge time constant, and correcting the pulse width initial value according to a preset temperature correction coefficient and an ambient temperature reference value to obtain a pulse width.

[0060] In a specific embodiment, the specific steps of analyzing the pulse width of the to-be-tested power distribution line are as follows: acquiring a line inductance of the to-be-tested power distribution line (determined by physical parameters of the line, usually measured by an inductance measuring instrument or electrical analysis software, in the design stage, the inductance can also be estimated by the material, length and layout of the cable, usually, the inductance is pre-set and stored in the system for subsequent calculation), and analyzing a charge-discharge time constant in combination with a corresponding line impedance value, the calculation formula of which is:

[0061]

[0062] Among them, , , The charge-discharge time constant, the line inductance and the line impedance value are in turn, the charge-discharge time constant is multiplied by a preset multiple as a pulse width initial value, and is corrected and analyzed in combination with an ambient temperature value to obtain the pulse width of the to-be-tested power distribution line.

[0063] Among them, the specific formula for calculating the pulse width initial value and the pulse width is as follows:

[0064]

[0065] Among them, , , The pulse width initial value, the charge-discharge time constant and the preset multiple are in turn, and the preset multiple takes a value of 1.5 in the embodiment. , , , The pulse width of the to-be-tested power distribution line, the ambient temperature value and the ambient temperature reference value are in turn, The temperature correction coefficient stored in the database takes a value of 0.05 in the embodiment.

[0066] In the embodiment, the operation parameter of the to-be-tested power distribution line is acquired, and a direct current test signal parameter set of the to-be-tested power distribution line is acquired according to the operation parameter, including: acquiring a line electrical response time length and a corresponding pulse width of the to-be-tested power distribution line, comparing the line electrical response time length with the pulse width, and taking a larger value as a cycle calculation reference; calculating a repetition cycle initial value according to the cycle calculation reference, and correcting the repetition cycle initial value through a real-time collected environmental temperature to obtain a repetition cycle.

[0067] In a specific embodiment, the specific steps of analyzing the repetition cycle of the to-be-tested power distribution line are as follows: a line electrical response time length of the to-be-tested power distribution line is acquired, and a corresponding pulse width is combined for comparative analysis, and a larger value is taken as a cycle calculation reference, wherein the line electrical response time length refers to a time required from the start of direct current signal injection to the reaching of a steady-state response of the line, the response time length can be measured in real time through a test device, or can be derived through calculation on electrical parameters (such as resistance and inductance) of the line, in the test process, the system dynamically adjusts the response time length according to the real-time measured data to ensure that each test signal is completed in a steady state; the cycle calculation reference is multiplied by a preset multiple (m, and m≥2) to obtain a repetition cycle initial value, and the repetition cycle initial value is corrected and analyzed in combination with an environmental temperature value to obtain the repetition cycle of the to-be-tested power distribution line.

[0068] S102, according to the direct current test signal parameter set, a direct current signal source is controlled to test a direct current signal to the to-be-tested power distribution line, and a line direct current response data set is collected in the test process; wherein the line direct current response data set includes voltage values, current values and leakage current values at a plurality of time points;

[0069] S103, according to the line direct current response data set, a power distribution line state analysis is performed to obtain a line detection result; wherein the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

[0070] In the embodiment, according to the line direct current response data set, a power distribution line state analysis is performed to obtain a line detection result, including: according to leakage current values at a plurality of time points in the line direct current response data set, a peak value and an average value of the leakage current are calculated; if the peak value is greater than a preset maximum allowable leakage current value or the average value is greater than a preset percentage reference, it is determined that the line insulation state of the to-be-tested power distribution line is unqualified, otherwise, according to current values and voltage values at a plurality of time points in the line direct current response data set, electrical performance analysis is performed.

[0071] In the embodiment, the electrical performance analysis is performed according to the current values and voltage values of the plurality of time points in the line DC response data set, specifically, the signal attenuation rate of the current signal is calculated according to the current values and voltage values of the plurality of time points in the line DC response data set; if the signal attenuation rate is greater than a preset signal attenuation threshold, it is determined that the electrical performance of the power distribution line under test is unqualified.

[0072] In a specific embodiment, the specific steps of analyzing the line operation state determination result are as follows: based on the leakage current values of the plurality of time points in the line DC response data set, the peak value and the average value of the leakage current are analyzed and compared with the maximum allowed leakage current value and its percentage reference, the insulation state of the line is determined, if the peak value or the average value of the leakage current exceeds the maximum allowed leakage current value or its percentage reference (70% or 80%), it is determined that the insulation state of the line is unqualified, if it is lower than these values, it is considered that the insulation state of the line is qualified; according to the result of the insulation state determination, the voltage values and current values of the plurality of time points in the line DC response data set are analyzed, the attenuation characteristic of the current signal is calculated, and compared with the set current attenuation threshold to determine whether there is a decline in electrical performance or unqualified transmission characteristic, and the determination result of the line operation state is obtained, which is specifically: if the insulation state of the line is qualified, the electrical performance analysis is continued; if the insulation state is unqualified, the line is directly marked as unqualified, and the subsequent steps are skipped, in the case of being qualified, the voltage values and current values in the line DC response data set are read next, the attenuation characteristic of the current signal is calculated, that is, according to the change of the current with time, it is evaluated whether the current signal attenuates too much, the attenuation characteristic is usually determined by calculating the signal attenuation rate, the calculation method is to calculate the ratio of the initial value and the end value of the current signal, and compare the attenuation rate with the set current attenuation threshold, if the attenuation rate is greater than the set threshold, it means that the line has the risk of electrical performance decline or unqualified transmission characteristic, finally, the operation state of the line is judged according to the calculation result of the current attenuation characteristic.

[0073] Preferably, when the determination result is qualified or there is a risk, the DC signal source output is immediately stopped, and the end time and end reason of the test sending are recorded; the DC test sending signal parameter set of this test sending, the line DC response data set, the analysis results and the final determination conclusion are summarized and arranged to form a test sending result report, and numbered and archived.

[0074] This invention, through a closed-loop process from dynamically adapting test parameters to accurately acquiring dynamic responses and then to comprehensive two-dimensional analysis, solves the problems of fixed parameters not matching reality, one-sided data acquisition, and singular state assessment in existing technologies. Specifically, dynamic parameters ensure that the test signal matches the line's operating conditions, avoiding detection distortion caused by inappropriate signals; multi-dimensional dynamic data provides sufficient basis for analysis, reducing random data errors; dual analysis of insulation status and electrical performance covers core fault types, avoiding omissions, ultimately achieving a comprehensive and accurate assessment of the distribution line's condition and significantly improving detection reliability. Compared with existing technologies, this invention can improve the reliability of distribution line detection results through automated DC signal testing.

[0075] Example 2:

[0076] like Figure 2 As shown, this embodiment provides a line testing device based on DC signal testing, including a parameter acquisition module 201, a response data acquisition module 202, and a test result acquisition module 203, wherein...

[0077] The parameter acquisition module 201 is used to acquire the operating parameters of the power distribution line under test, and to acquire the DC test signal parameter set of the power distribution line under test based on the operating parameters; wherein, the DC test signal parameter set includes target voltage value, target current value, pulse width and repetition period;

[0078] In this embodiment, the parameter acquisition module 201 acquires the operating parameters of the power distribution line under test, and acquires the DC test signal parameter set of the power distribution line under test based on the operating parameters, including: the parameter acquisition module 201 acquires the voltage coefficient and the corresponding line rated voltage value of the power distribution line under test, and calculates the preliminary target voltage value of the power distribution line under test based on the voltage coefficient and the line rated voltage value; acquires the pre-stored ambient temperature reference value and temperature correction coefficient, and corrects the preliminary target voltage value based on the ambient temperature reference value and the temperature correction coefficient to obtain the target voltage value.

[0079] In the embodiment, the parameter acquisition module 201 acquires the operating parameter of the to-be-tested power distribution line, and acquires the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter, including: the parameter acquisition module 201 acquires the line impedance value of the to-be-tested power distribution line, and calculates a preliminary theoretical current value according to the line impedance value and the target voltage value; the preliminary theoretical current value is corrected according to preset line-to-ground electromagnetic field and line-to-ground capacitance parameters to obtain a theoretical target current value; the safety factor and the corresponding rated current value of the to-be-tested power distribution line are acquired, and the allowed test current value is calculated according to the safety factor and the rated current value; the theoretical target current value and the allowed test current value are compared, and the smaller one is taken as the target current value of the to-be-tested power distribution line.

[0080] In the embodiment, the parameter acquisition module 201 acquires the operating parameter of the to-be-tested power distribution line, and acquires the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter, including: the parameter acquisition module 201 acquires the line inductance and the corresponding line impedance value of the to-be-tested power distribution line, and calculates a charge-discharge time constant according to the line inductance and the line impedance value; the pulse width initial value is calculated according to the charge-discharge time constant, and the pulse width initial value is corrected according to a preset temperature correction coefficient and an environmental temperature reference value to obtain a pulse width.

[0081] In the embodiment, the parameter acquisition module 201 acquires the operating parameter of the to-be-tested power distribution line, and acquires the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter, including: the parameter acquisition module 201 acquires the line electrical response time length and the corresponding pulse width of the to-be-tested power distribution line, and compares the line electrical response time length with the pulse width, and takes the larger one as a cycle calculation reference; the repetition cycle initial value is calculated according to the cycle calculation reference, and the repetition cycle initial value is corrected through the real-time collected environmental temperature to obtain a repetition cycle.

[0082] The response data acquisition module 202 is configured to control a direct-current signal source to test a direct-current signal to the to-be-tested power distribution line according to the direct-current test signal parameter set, and to collect a line direct-current response data set during the testing process; wherein the line direct-current response data set includes voltage values, current values and leakage current values at a plurality of time points.

[0083] The detection result acquisition module 203 is configured to analyze the state of the power distribution line according to the line direct-current response data set to obtain a line detection result; wherein the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

[0084] In this embodiment, the detection result acquisition module 203 performs a power distribution line status analysis based on the line DC response dataset to obtain the line detection result, including: the detection result acquisition module 203 calculates the peak value and average value of the leakage current based on the leakage current values ​​at several time points in the line DC response dataset; if the peak value is greater than the preset maximum allowable leakage current value or the average value is greater than the preset percentage benchmark, then the insulation status of the power distribution line under test is determined to be unqualified; otherwise, electrical performance analysis is performed based on the current and voltage values ​​at several time points in the line DC response dataset.

[0085] In this embodiment of the invention, the parameter acquisition module 201 obtains a DC test signal parameter set based on operating parameters, avoiding the problem of mismatch between fixed parameters and actual line conditions in the prior art. This ensures that the test signal aligns with the actual line condition from the source, laying the foundation for subsequent accurate detection. The response data acquisition module 202 controls the DC signal source to test-send DC signals based on the DC test signal parameter set, collecting a DC response dataset of the line during the test. By injecting signals according to the appropriate parameters, it ensures that the signal strength is sufficient to stimulate the line response without overloading and damaging the line. Furthermore, the acquisition of multi-dimensional data at multiple time points captures the real-time dynamic changes in the line response, avoiding detection deviations caused by the randomness of single data points. The detection result acquisition module 203 performs a power distribution line status analysis based on the response dataset to obtain the detection results. Insulation faults and electrical performance degradation are the core fault types of power distribution lines. The dual-dimensional analysis covers the main risk points of the line, avoiding omissions of transmission performance issues from a single dimension, and ensuring the comprehensiveness and reliability of the status assessment.

[0086] like Figure 3 As shown, this embodiment provides another line testing device based on DC signal test transmission, including an operation data acquisition unit 301, a test transmission parameter analysis unit 302, a signal injection and response acquisition unit 303, a status determination and analysis unit 304, and a test transmission end and result generation unit 305, wherein,

[0087] The operation data acquisition unit 301 is used to acquire the operation parameters of the power distribution line under test, including the line rated voltage value, rated current value, line impedance value, maximum allowable leakage current value and ambient temperature value.

[0088] The test transmission parameter analysis unit 302 is used to analyze the DC test transmission signal parameter set of the power distribution line under test based on the operating parameters, including the target voltage, target current, pulse width and repetition period;

[0089] The signal injection and response acquisition unit 303 is configured to control the DC signal source to inject a DC signal into the power distribution line according to the DC test signal parameter set, and to acquire a line DC response data set during the test.

[0090] The state determination analysis unit 304 is configured to analyze a line operation state determination result based on the line DC response data set.

[0091] The test end and result generation unit 305 is configured to end the DC signal test according to the line operation state determination result, and to generate a test result report.

[0092] The working principle and step flow of the embodiment can be but not limited to the related description of the first embodiment.

[0093] Embodiment three:

[0094] The embodiment provides a terminal device, which comprises a processor, a memory, a communication interface and a communication bus, and the processor, the memory and the communication interface complete mutual communication through the communication bus.

[0095] The memory is used for storing at least one executable instruction, and the executable instruction makes the processor execute the operation of the line detection method based on the DC signal test.

[0096] Embodiment four:

[0097] The embodiment of the application provides a computer readable storage medium, which comprises a stored computer program, wherein when the computer program runs, the computer readable storage medium controls a device or apparatus where the computer readable storage medium is located to execute the line detection method based on the DC signal test.

[0098] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium. When the program is executed, the program can include the processes of the above-mentioned embodiments. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM) or a random access memory (RAM).

[0099] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above-described specific embodiments are merely examples of the present application and are not intended to limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting a line based on a direct current signal transmission, characterized in that, The method comprises the following steps: acquiring an operating parameter of a to-be-tested power distribution line, and acquiring a direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter; wherein the direct-current test signal parameter set comprises a target voltage value, a target current value, a pulse width, and a repetition period; each direct-current test signal parameter in the direct-current test signal parameter set is obtained by correcting a real-time temperature; the repetition period is calculated according to the pulse width; the acquiring of the operating parameter of the to-be-tested power distribution line and the acquiring of the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter comprises the following steps: acquiring a line impedance value of the to-be-tested power distribution line, and calculating a preliminary theoretical current value according to the line impedance value and the target voltage value; correcting the preliminary theoretical current value according to preset line-to-ground electromagnetic field and line-to-ground capacitance parameters to obtain a theoretical target current value; acquiring a safety factor and a corresponding rated current value of the to-be-tested power distribution line, and calculating an allowable test current value according to the safety factor and the rated current value; comparing the theoretical target current value with the allowable test current value, and taking the smaller value as the target current value of the to-be-tested power distribution line; controlling a direct-current signal source according to the direct-current test signal parameter set to test a direct-current signal to the to-be-tested power distribution line, and collecting a line direct-current response data set during the test; wherein the line direct-current response data set comprises voltage values, current values, and leakage current values at a plurality of time points; performing power distribution line state analysis according to the line direct-current response data set to obtain a line detection result; wherein the power distribution line state analysis comprises line insulation state analysis and electrical performance analysis.

2. A method for detecting a line based on a direct current signal as claimed in claim 1, characterized in that, The acquiring of the operating parameter of the to-be-tested power distribution line and the acquiring of the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter comprises the following steps: acquiring a voltage coefficient and a corresponding line rated voltage value of the to-be-tested power distribution line, and calculating a preliminary target voltage value of the to-be-tested power distribution line according to the voltage coefficient and the line rated voltage value; acquiring a pre-stored environmental temperature reference value and a temperature correction coefficient, and correcting the preliminary target voltage value according to the environmental temperature reference value and the temperature correction coefficient to obtain the target voltage value.

3. A method for detecting a line based on a direct current signal as claimed in claim 1, characterized in that, The acquiring of the operating parameter of the to-be-tested power distribution line and the acquiring of the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter comprises the following steps: acquiring a line inductance value and a corresponding line impedance value of the to-be-tested power distribution line, and calculating a charge-discharge time constant according to the line inductance value and the line impedance value; calculating a pulse width initial value according to the charge-discharge time constant, and correcting the pulse width initial value according to a preset temperature correction coefficient and an environmental temperature reference value to obtain the pulse width.

4. The method of claim 1, wherein the DC signal is transmitted through the line. The acquiring of the operating parameter of the to-be-tested power distribution line and the acquiring of the direct-current test signal parameter set of the to-be-tested power distribution line according to the operating parameter comprises the following steps: Acquire the line electrical response duration and the corresponding pulse width of the to-be-tested power distribution line, and compare the line electrical response duration with the pulse width, taking the larger value as the cycle calculation reference; According to the cycle calculation reference, calculate the initial repetition cycle value, and correct the initial repetition cycle value through the real-time collected environmental temperature to obtain the repetition cycle.

5. The method of claim 1, wherein the DC signal is transmitted by a DC power line. According to the line DC response data set, perform power distribution line state analysis to obtain line detection results, including: ​ According to the leakage current values at several time points in the line DC response data set, calculate the peak value and the average value of the leakage current; If the peak value is greater than the preset maximum allowable leakage current value or the average value is greater than the preset percentage reference, it is determined that the line insulation state of the to-be-tested power distribution line is unqualified, otherwise, according to the current values and voltage values at several time points in the line DC response data set, perform electrical performance analysis.

6. A method of line testing based on a DC signal transmission as claimed in claim 5, characterized in that, According to the current values and voltage values at several time points in the line DC response data set, perform electrical performance analysis, specifically: According to the current values and voltage values at several time points in the line DC response data set, calculate the signal attenuation rate of the current signal; If the signal attenuation rate is greater than the preset signal attenuation threshold, it is determined that the electrical performance of the to-be-tested power distribution line is unqualified.

7. A line detection apparatus based on a direct current signal transmission, characterized by The parameter acquisition module is configured to acquire the operating parameters of the to-be-tested power distribution line, and acquire the DC test signal parameter set of the to-be-tested power distribution line according to the operating parameters; wherein the DC test signal parameter set includes a target voltage value, a target current value, a pulse width, and a repetition cycle; each DC test signal parameter in the DC test signal parameter set is obtained by correcting the real-time temperature; the repetition cycle is calculated according to the pulse width; the parameter acquisition module is configured to acquire the operating parameters of the to-be-tested power distribution line, and acquire the DC test signal parameter set of the to-be-tested power distribution line according to the operating parameters, including: Acquire the line impedance value of the to-be-tested power distribution line, and calculate a preliminary theoretical current value according to the line impedance value and the target voltage value; According to the preset line-to-ground electromagnetic field and line-to-ground capacitance parameters, correct the preliminary theoretical current value to obtain a theoretical target current value; Acquire the safety factor and the corresponding rated current value of the to-be-tested power distribution line, and calculate the allowable test current value according to the safety factor and the rated current value; Compare the theoretical target current value with the allowable test current value, and take the smaller value as the target current value of the to-be-tested power distribution line; The response data acquisition module is configured to control a DC signal source to test a DC signal to the to-be-tested power distribution line according to the DC test signal parameter set, and acquire a line DC response data set during the test; wherein the line DC response data set includes voltage values, current values, and leakage current values at several time points; ​ The detection result acquisition module is configured to perform power distribution line state analysis according to the line DC response data set to obtain line detection results; wherein the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

8. A terminal device, comprising: Comprise: A processor, a memory, a communication interface and a communication bus, the processor, the memory and the communication interface complete the communication among each other through the communication bus; The memory is used for storing at least one executable instruction, and the executable instruction makes the processor execute the operation of the line detection method based on the DC signal test sending in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium includes a stored computer program, wherein when the computer program runs, the device or apparatus where the computer readable storage medium is located executes the line detection method based on the DC signal test sending in any one of claims 1 to 6.

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