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

Abstract

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

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: 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; According to the direct current test signal parameter set, controlling the direct current signal source to test the direct current signal to the to-be-tested distribution line, and collecting the line direct current response data set 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; According to the line direct current response data set, power distribution line state analysis is performed to obtain line detection results; wherein, the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

[0006] The embodiment of the present application can avoid the problem of mismatching between fixed parameters and actual line working conditions in the prior art by obtaining a direct current 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 direct current signal source to test the direct current signal according to the direct current test signal parameter set, the line direct current 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 can capture the real-time dynamic changes of the line response, avoiding detection deviation caused by the contingency of single data; by performing power distribution line state analysis according to the response data set, the detection results are obtained, 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 single dimension, and ensure the comprehensiveness of state evaluation. Through the closed-loop process from dynamically adaptive test parameters to accurate collection of dynamic response to comprehensive double-dimensional analysis, 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, wherein the dynamic parameters ensure that the test signal matches the line working conditions, 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 automatically test the direct current signal to improve the reliability of the detection results of the power distribution line.

[0007] Further, the operating parameters of the to-be-tested power distribution line are obtained, and the direct current test signal parameter set of the to-be-tested power distribution line is obtained according to the operating parameters, including: 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; 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.

[0008] This embodiment of the present invention uses voltage coefficient correction to correct for fundamental characteristics and temperature correction to compensate for environmental influences, ensuring that the target voltage is tailored to both the inherent electrical properties of the circuit and the real-time environmental conditions. This addresses the existing problem of inaccurate voltage parameters caused by ignoring ambient temperature and actual circuit characteristics. This precise target voltage ensures that the test signal effectively stimulates a circuit response without damaging it due to excessive voltage or causing a weak response due to excessive voltage. This ensures the effectiveness of subsequent data acquisition and further improves detection reliability.

[0009] Furthermore, the step of obtaining operating parameters of the distribution line to be tested and obtaining a DC test signal parameter set of the distribution line to be tested based on the operating parameters includes: Obtaining a line impedance value of the power distribution line to be tested, and calculating a preliminary theoretical current value based on 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; Obtaining the safety factor and the corresponding rated current value of the distribution line to be tested, and calculating the allowable test current value based on the safety factor and the rated current value; The theoretical target current value is compared with the allowable trial current value, and the smaller value is taken as the target current value of the distribution line to be tested.

[0010] The present invention combines multi-parameter theoretical current correction with calculation logic based on safety upper limit constraints, ensuring that the target current is both consistent with the actual electrical environment of the line and strictly controlled within a safe range. This solves the problem of existing technologies that only consider current parameters based on Ohm's law and ignore actual interference and safety redundancy. The precise and safe target current ensures that the line is not damaged during the test transmission process, while also enabling the collection of clear response data, avoiding invalid detection or line failures due to improper current, improving detection safety and data validity, and ensuring reliability.

[0011] Furthermore, the step of obtaining operating parameters of the distribution line to be tested and obtaining a DC test signal parameter set of the distribution line to be tested based on the operating parameters includes: Obtaining the line inductance and the corresponding line impedance value of the distribution line to be tested, and calculating the charge and discharge time constant based on the line inductance and the line impedance value; An initial pulse width value is calculated according to the charge and discharge time constant, and the initial pulse width value is corrected according to a preset temperature correction coefficient and an ambient temperature reference value to obtain a pulse width.

[0012] 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.

[0013] 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: 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; 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.

[0014] The embodiment of the present application solves the problem of fixed repetition cycle and easy signal superposition 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.

[0015] Further, the power distribution line state analysis is performed according to the line direct-current response data set to obtain a line detection result, including: 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; 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.

[0016] 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 peak value and the average value double index cover 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 performed on the premise of qualified insulation, thereby improving the effectiveness and reliability of the overall detection.

[0017] 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: 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. 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.

[0018] 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 inability to quantify in the 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, avoiding 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.

[0019] 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, The parameter acquisition module is configured to acquire the operating parameters of the power distribution line under test, and acquire a direct current test signal parameter set of the power distribution line under test 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. 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 under test, 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. The detection result acquisition module is configured to perform 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.

[0020] 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 direct current test signal parameter set according to the operation parameters, so as to make the test signal conform to the actual state of the line from the source, lay a foundation for subsequent accurate detection; the direct current signal source test direct current signal according to the direct current test signal parameter set by the response data acquisition module, so as to collect the line direct current response data set in the test process, so as to inject the signal 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 change of the line response, avoid the detection deviation caused by the contingency of single data; the detection result acquisition module analyzes the distribution line state according to the response data set, and obtains the detection result, wherein the insulation fault and the electrical performance decline are the core fault types of the distribution line, the double-dimensional analysis can cover the main risk points of the line, avoid the omission of the transmission performance problem in single dimension, and ensure the comprehensiveness and reliability of the state evaluation.

[0021] In a third aspect, an embodiment of the present application 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 the communication among each other through the communication bus; 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 direct current signal test as described in any one of the above.

[0022] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, the computer readable storage medium 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 direct current signal test as described in any one of the above.

[0023] The above description is only a summary of the technical scheme of the embodiment of the present application, in order to more clearly understand the technical means of the embodiment of the present application, the embodiment can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the embodiment of the present application more obvious and easy to understand, the specific embodiment of the present application is described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A line detection method based on direct current signal test provided by the embodiment of the present application is shown in the figure; Figure 2 A line detection device structure diagram based on direct current signal test provided by the embodiment of the present application is shown in the figure; Figure 3 Another line detection device structure diagram based on direct current signal test provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Example 1: like Figure 1 As shown, a line detection method based on DC signal test transmission provided by an embodiment of the present invention includes the following steps: S101, obtaining operating parameters of a distribution line to be tested, and obtaining a DC test signal parameter set for the distribution line to be tested based on 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 period; In this embodiment, the operating parameters of the distribution line to be tested are obtained, and based on the operating parameters, a set of DC test signal parameters of the distribution line to be tested is obtained, including: obtaining the voltage coefficient of the distribution line to be tested and the corresponding line rated voltage value, and calculating the preliminary target voltage value of the distribution line to be tested based on the voltage coefficient and the line rated voltage value; obtaining a pre-stored ambient temperature reference value and a temperature correction coefficient, and correcting the preliminary target voltage value based on the ambient temperature reference value and the temperature correction coefficient to obtain a target voltage value.

[0027] In a specific embodiment, the specific steps for analyzing the target voltage of the distribution line to be tested are as follows: obtain the voltage coefficient of the distribution line to be tested, and perform multiplication analysis in combination with the corresponding line rated voltage value to obtain a preliminary target voltage value of the distribution line to be tested, wherein the voltage coefficient is preset by the system and is used to correct the line rated voltage value to conform to changes in environmental factors. Usually, 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 corrected and analyzed in combination with the ambient temperature value to obtain the target voltage of the distribution line to be tested.

[0028] The specific formula for calculating the target voltage is as follows: Where, 、 、 、 The order is target voltage, preliminary target voltage value, ambient temperature value, and ambient temperature reference value of the distribution line to be tested. The temperature correction coefficient stored in the database is 0.05 in this embodiment.

[0029] In this embodiment, 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. 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. 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. 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 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 one is taken as the target current value of the to-be-tested power distribution line.

[0030] 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 acquired, and multiplication analysis is performed in combination with the corresponding rated current value to obtain the corresponding allowed test current value, and the theoretical target current value is compared, and the smaller one 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 standard, and is used to ensure that the current in the test process does not exceed the safety bearing range of the line or the equipment. The safety factor is usually determined according to the design standard of the equipment and the expected use environment. In actual application, the coefficient is generally stored in the equipment parameter database, and is adjusted according to different test requirements.

[0031] In this embodiment, 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. 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. 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. 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 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 one is taken as the target current value of the to-be-tested power distribution line.

[0032] In a specific embodiment, the specific steps of analyzing the pulse width of the power distribution line to be tested are as follows: obtaining the line inductance of the power distribution line to be tested (determined by the physical parameters of the line, usually measured by inductance measuring instruments 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 combining the corresponding line impedance value, analyzing the charge-discharge time constant, the calculation formula is: Wherein, 、 、 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 the pulse width initial value, and is corrected and analyzed in combination with the ambient temperature value to obtain the pulse width of the power distribution line to be tested.

[0033] Wherein, the specific formula for calculating the pulse width initial value and the pulse width is as follows: Wherein, 、 、 The pulse width initial value, the charge-discharge time constant, and the preset multiple are in turn, and the preset multiple is taken as , 、 、 The pulse width of the power distribution line to be tested, the ambient temperature value, and the ambient temperature reference value are in turn, The temperature correction coefficient stored in the database, which is taken as 0.05 in this embodiment.

[0034] In this embodiment, the operation parameters of the power distribution line to be tested are obtained, and the direct current test signal parameter set of the power distribution line to be tested is obtained according to the operation parameters, including: obtaining the line electrical response time length and the corresponding pulse width of the power distribution line to be tested, and comparing the line electrical response time length with the pulse width, taking the larger value as the cycle calculation reference; according to the cycle calculation reference, the repetition cycle initial value is calculated, and the repetition cycle initial value is corrected by the real-time collected ambient temperature to obtain the repetition cycle.

[0035] In a specific embodiment, the specific steps of analyzing the repetition period of the to-be-tested power distribution line are as follows: obtaining the line electrical response duration of the to-be-tested power distribution line, and combining the corresponding pulse width to perform comparative analysis, taking the larger value as the period calculation reference, wherein the line electrical response duration refers to the time required from the start of the direct current signal injection to the steady-state response of the line, the response duration can be measured in real time by the test equipment, or can be derived by calculating the electrical parameters (such as resistance, inductance) of the line, during the trial sending process, the system will dynamically adjust the response duration according to the real-time measured data to ensure that each trial sending signal can be completed in a steady state; multiplying the period calculation reference by a preset multiple (m, and m≥2) to obtain the repetition period initial value, and combining the ambient temperature value to perform correction analysis to obtain the repetition period of the to-be-tested power distribution line.

[0036] S102, according to the direct current trial sending signal parameter set, controlling the direct current signal source to send direct current signal to the to-be-tested power distribution line, and collecting line direct current response data set during the trial sending process; wherein the line direct current response data set includes voltage values, current values and leakage current values at several time points; S103, according to the line direct current response data set, performing power distribution line state analysis to obtain line detection results; wherein the power distribution line state analysis includes line insulation state analysis and electrical performance analysis.

[0037] In this embodiment, according to the line direct current response data set, the power distribution line state analysis is performed to obtain the line detection results, including: according to the leakage current values at several time points in the line direct current response data set, calculating the peak value and average value of the leakage current; if the peak value is greater than the preset maximum allowed 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 direct current response data set, the electrical performance analysis is performed.

[0038] In this embodiment, according to the current values and voltage values at several time points in the line direct current response data set, the electrical performance analysis is performed, specifically: according to the current values and voltage values at several time points in the line direct current response data set, the signal attenuation rate of the current signal is calculated; 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.

[0039] 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 several 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 allowable leakage current value and its percentage benchmark (70% or 80%), the line insulation state is determined, if the peak value or the average value of the leakage current exceeds the maximum allowable leakage current value or its percentage benchmark (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 value and the current value of several 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, whether there is a decline in electrical performance or unqualified transmission characteristic is judged, and the determination result of the line operation state is obtained, which is specific: if the insulation state of the line is qualified, the analysis of the electrical performance 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 value and the current value 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, whether the current signal attenuates too much is evaluated, the attenuation characteristic is usually determined by calculating the signal attenuation rate, the calculation method is to calculate the ratio of the starting value and the ending value of the current signal, the attenuation rate is compared with the set current attenuation threshold, if the attenuation rate is greater than the set threshold, it means that there is a risk of decline in electrical performance or unqualified transmission characteristic of the line, finally, the operation state of the line is judged according to the calculation result of the current attenuation characteristic.

[0040] 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 the end reason of the test sending are recorded; the DC test sending signal parameter set of this time, the line DC response data set, the analysis results and the final determination conclusion are summarized to form a test sending result report, and are numbered and archived.

[0041] The embodiment of the present application solves the problems of fixed parameters not fitting the actual situation, one-sided data collection and single state evaluation in the prior art through the closed loop process from dynamically adapting test sending parameters, to accurately collecting dynamic response, to comprehensive double-dimension analysis, wherein the dynamic parameters ensure that the test sending signal matches the line working condition, avoiding detection distortion caused by improper signal; the multi-dimensional dynamic data provides sufficient basis for analysis, reducing accidental error of data; the 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 distribution line, significantly improving the detection reliability. Compared with the prior art, the present application can improve the reliability of the detection result of the distribution line through automatic DC signal test sending.

[0042] Embodiment two: As Figure 2As shown, the embodiment provides a line detection device based on direct current signal test, which comprises a parameter acquisition module 201, a response data acquisition module 202 and a detection result acquisition module 203, wherein, The parameter acquisition module 201 is configured to acquire the operating parameters of the to-be-tested power distribution line, and acquire a direct current test signal parameter set of the to-be-tested power distribution line 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. In the embodiment, the parameter acquisition module 201 acquires the operating parameters 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 parameters, comprising: the parameter acquisition module 201 acquires the voltage coefficient and the corresponding line rated voltage value of the to-be-tested power distribution line, and calculates the preliminary target voltage value of the to-be-tested power distribution line according to the voltage coefficient and the line rated voltage value; acquires the pre-stored environmental temperature reference value and the temperature correction coefficient, and corrects the preliminary target voltage value according to the environmental temperature reference value and the temperature correction coefficient to obtain the target voltage value.

[0043] In the embodiment, the parameter acquisition module 201 acquires the operating parameters 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 parameters, comprising: the parameter acquisition module 201 acquires the line impedance value of the to-be-tested power distribution line, and calculates the preliminary theoretical current value according to the line impedance value and the target voltage value; corrects the preliminary theoretical current value according to the pre-set line-to-ground electromagnetic field and line-to-ground capacitance parameters to obtain the theoretical target current value; acquires the safety coefficient and the corresponding rated current value of the to-be-tested power distribution line, and calculates the allowed test current value according to the safety coefficient and the rated current value; compares the theoretical target current value with the allowed test current value, and takes the smaller value as the target current value of the to-be-tested power distribution line.

[0044] In the embodiment, the parameter acquisition module 201 acquires the operating parameters 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 parameters, comprising: 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 the charge-discharge time constant according to the line inductance and the line impedance value; calculates the pulse width initial value according to the charge-discharge time constant, and corrects the pulse width initial value according to the pre-set temperature correction coefficient and the environmental temperature reference value to obtain the pulse width.

[0045] In the embodiment, the parameter acquisition module 201 acquires the operating parameters 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 parameters, 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, compares the line electrical response time length with the pulse width, and takes the larger value as the cycle calculation reference; according to the cycle calculation reference, the initial value of the repetition period is calculated, and the initial value of the repetition period is corrected through the real-time collected environmental temperature to obtain the repetition period.

[0046] 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 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. The detection result acquisition module 203 is configured to perform 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 includes line insulation state analysis and electrical performance analysis.

[0047] In the embodiment, the detection result acquisition module 203 performs power distribution line state analysis according to the line direct-current response data set to obtain a line detection result, including: the detection result acquisition module 203 calculates the peak value and the average value of the leakage current according to the leakage current values at a plurality of time points in the line direct-current response data set; 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, the electrical performance analysis is performed according to the current values and the voltage values at a plurality of time points in the line direct-current response data set.

[0048] The embodiment of the present application can obtain the direct current test signal parameter set according to the operating parameter through the parameter acquisition module 201, avoid the problem that the fixed parameter in the prior art does not match the actual line working condition, make the test signal conform to the actual state of the line from the source, lay a foundation for subsequent accurate detection, control the direct current signal source to test the direct current signal according to the direct current test signal parameter set through the response data acquisition module 202, collect the line direct current response data set in the test process, and thus inject the signal according to the adaptive parameter, so that the signal strength is sufficient to excite the line response and does not overload and damage the line, and the multi-dimensional data at multiple time points is collected, the real-time dynamic change of the line response can be captured, and the detection deviation caused by the contingency of single data is avoided; the detection result acquisition module 203 analyzes the distribution line state according to the response data set, and obtains the detection result, wherein the insulation fault and the electrical performance decline are the core fault types of the distribution line, the double-dimensional analysis can cover the main risk points of the line, avoid missing the transmission performance problem in a single dimension, and ensure the comprehensiveness and reliability of the state evaluation.

[0049] As shown in Figure 3 The embodiment provides another line detection device based on direct current signal test, which comprises an operating data acquisition unit 301, a test parameter analysis unit 302, a signal injection and response acquisition unit 303, a state determination analysis unit 304 and a test end and result generation unit 305. The operating data acquisition unit 301 is used to acquire the operating parameter of the distribution line to be tested, including the line rated voltage value, the rated current value, the line impedance value, the maximum allowable leakage current value and the environmental temperature value. The test parameter analysis unit 302 is used to analyze the direct current test signal parameter set of the distribution line to be tested based on the operating parameter, including the target voltage, the target current, the pulse width and the repetition period. The signal injection and response acquisition unit 303 is used to control the direct current signal source to inject the direct current signal into the distribution line according to the direct current test signal parameter set, and collect the line direct current response data set in the test process. The state determination analysis unit 304 is used to analyze the line operating state determination result based on the line direct current response data set. The test end and result generation unit 305 is used to end the direct current signal test according to the line operating state determination result, and generate a test result report.

[0050] The more detailed working principle and step flow of the embodiment can be but not limited to the related description of embodiment one.

[0051] Embodiment three: The 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 mutual communication 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 direct current signal test sending according to any one of the above.

[0052] Embodiment four: The embodiment of the application provides a computer readable storage medium, and the computer readable storage medium comprises a stored computer program, wherein when the computer program runs, the computer readable storage medium controls a device or an apparatus where the computer readable storage medium is located to execute the line detection method based on the direct current signal test sending according to any one of the above.

[0053] 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) and the like.

[0054] The above-mentioned specific embodiments further specifically describe the purposes, technical solutions and beneficial effects of the application. It should be understood that the above-mentioned embodiments are only specific embodiments of the application and are not used to limit the protection scope of the application. It should be particularly pointed out that any modification, equivalent replacement, improvement and the like made by those skilled in the art within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A line detection method based on DC signal test transmission, characterized in that: include: Obtaining operating parameters of the distribution line to be tested, and obtaining a DC test signal parameter set for the distribution line to be tested based on 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 period; Controlling a DC signal source according to the DC test signal parameter set to test-send a DC signal to the distribution line under test, and collecting 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 a plurality of time points; A distribution line status analysis is performed based on the line DC response data set to obtain a line detection result; wherein the distribution line status analysis includes line insulation status analysis and electrical performance analysis.

2. A line detection method based on DC signal test transmission according to claim 1, characterized in that: The step of obtaining the operating parameters of the distribution line to be tested and obtaining a DC test signal parameter set of the distribution line to be tested based on the operating parameters includes: Obtaining a voltage coefficient of a distribution line to be tested and a corresponding line rated voltage value, and calculating a preliminary target voltage value of the distribution line to be tested based on the voltage coefficient and the line rated voltage value; A pre-stored ambient temperature reference value and a temperature correction coefficient are obtained, and the preliminary target voltage value is corrected according to the ambient temperature reference value and the temperature correction coefficient to obtain a target voltage value.

3. A line detection method based on DC signal test transmission as claimed in claim 2, characterized in that: The step of obtaining the operating parameters of the distribution line to be tested and obtaining a DC test signal parameter set of the distribution line to be tested based on the operating parameters includes: Obtaining a line impedance value of the power distribution line to be tested, and calculating a preliminary theoretical current value based on 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; Obtaining the safety factor and the corresponding rated current value of the distribution line to be tested, and calculating the allowable test current value based on the safety factor and the rated current value; The theoretical target current value is compared with the allowable trial current value, and the smaller value is taken as the target current value of the distribution line to be tested.

4. A line detection method based on DC signal test transmission according to claim 1, characterized in that: The step of obtaining the operating parameters of the distribution line to be tested and obtaining a DC test signal parameter set of the distribution line to be tested based on the operating parameters includes: Obtaining the line inductance and the corresponding line impedance value of the distribution line to be tested, and calculating the charge and discharge time constant based on the line inductance and the line impedance value; An initial pulse width value is calculated according to the charge and discharge time constant, and the initial pulse width value is corrected according to a preset temperature correction coefficient and an ambient temperature reference value to obtain a pulse width.

5. The line detection method based on DC signal test transmission according to claim 1, characterized in that: The step of obtaining the operating parameters of the distribution line to be tested and obtaining a DC test signal parameter set of the distribution line to be tested based on the operating parameters includes: Obtaining the line electrical response duration and the corresponding pulse width of the distribution line to be tested, and comparing the line electrical response duration with the pulse width, taking the larger value as a period calculation basis; The initial value of the repetition period is calculated according to the period calculation benchmark, and the initial value of the repetition period is corrected by the ambient temperature collected in real time to obtain the repetition period.

6. A line detection method based on DC signal test transmission according to claim 1, characterized in that: The performing of distribution line status analysis based on the line DC response data set to obtain line detection results includes: Calculating the peak value and average value of the leakage current according to the leakage current values ​​at several time points in the line DC response data set; 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, the line insulation state of the distribution line to be tested 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 data set.

7. A line detection method based on DC signal test transmission according to claim 6, characterized in that: The electrical performance analysis is performed based on the current and voltage values ​​at several time points in the line DC response data set, specifically: Calculating a signal attenuation rate of the current signal according to current values ​​and voltage values ​​at a 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 to be tested is unqualified.

8. A line detection device based on DC signal test transmission, characterized in that: It includes parameter acquisition module, response data acquisition module and detection result acquisition module, among which, The parameter acquisition module is used to obtain the operating parameters of the distribution line to be tested, and obtain a DC test signal parameter set of the distribution line to be tested based on 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 period; The response data acquisition module is configured to control a DC signal source to test-send a DC signal to the distribution line under test according to the DC test signal parameter set, and collect 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 a plurality of time points; The detection result acquisition module is used to perform distribution line status analysis based on the line DC response data set to obtain line detection results; wherein the distribution line status analysis includes line insulation status analysis and electrical performance analysis.

9. A terminal device, characterized in that: include: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform the operation of the line detection method based on DC signal trial transmission according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device or apparatus where the computer-readable storage medium is located is controlled to execute the line detection method based on DC signal trial transmission according to any one of claims 1 to 7.

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