A power distribution network broken line fault analysis method, device, equipment and storage medium

Abstract

The present application relates to the technical field of power distribution network broken line, and discloses a power distribution network broken line fault analysis method, device, equipment and storage medium; a broken line fault diagnosis range is constructed according to all suspected fault line parameters, a preset power supply upstream direction and a preset power supply downstream direction; a phase line fault diagnosis result is obtained by performing fault diagnosis on the broken line fault diagnosis range according to a preset first fault diagnosis condition, a preset zero current drop and a preset zero voltage drop; a neutral line fault diagnosis result is obtained by performing fault diagnosis on the load side three-phase ground voltage according to a preset neutral line fault diagnosis condition; a power distribution network fault diagnosis result is generated according to the phase line fault diagnosis result and the neutral line fault diagnosis result; suspected fault lines are collected and a diagnosis range is delimited, and the end branch topology is clarified; the current and voltage double threshold values are used to identify the open-phase line fault, and the accuracy of the power distribution network broken line fault diagnosis and the repair efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of power distribution network disconnection technology, and in particular to a method, apparatus, equipment and storage medium for analyzing power distribution network disconnection faults. Background Technology

[0002] The current low-voltage distribution network has a complex branch line topology and dispersed load locations, resulting in frequent line breaks, including two typical types: phase break and neutral break. Traditional fault diagnosis methods rely heavily on manual, segment-by-segment inspections, lacking a systematic mechanism for fault area screening and diagnostic scope delineation, leading to low efficiency and high labor costs. Existing diagnostic methods mostly target a single fault type independently, making it difficult to define fault boundaries; they also often use single electrical quantity thresholds for judgment, failing to effectively distinguish between actual line breaks and normal operating conditions such as light load, no load, and unbalanced three-phase loads, easily leading to misdiagnosis and missed faults. Furthermore, some existing solutions collect electrical signals at the beginning of the main line, which is prone to signal attenuation and distortion due to line transmission, making it difficult to accurately reflect the abnormal voltage and current characteristics of the end load side, and unable to simultaneously integrate phase break and neutral break fault conclusions. This results in a one-sided fault assessment, failing to meet the practical application needs of precise operation and maintenance, rapid repair, and power supply reliability assurance in the distribution network. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a method, device, equipment and storage medium for analyzing power distribution network disconnection faults.

[0004] A method for analyzing distribution network open-circuit faults includes: collecting all suspected fault route parameters from a preset distribution network fault diagnosis area to obtain multiple suspected fault route parameters; constructing an open-circuit fault diagnosis range based on all suspected fault route parameters, a preset upstream power supply direction, and a preset downstream power supply direction; performing fault diagnosis on the open-circuit fault diagnosis range based on preset first fault diagnosis conditions, preset zero-drop current, and preset zero-drop voltage to obtain phase line fault diagnosis results; collecting the three-phase phase-to-ground voltages on the load side and performing fault diagnosis on the three-phase phase-to-ground voltages on the load side based on preset neutral line fault diagnosis conditions to obtain neutral line fault diagnosis results; and generating a distribution network fault diagnosis result based on the phase line fault diagnosis results and the neutral line fault diagnosis results.

[0005] Furthermore, the step of constructing the fault diagnosis range based on all suspected fault route parameters, the preset upstream power supply direction, and the preset downstream power supply direction includes: determining multiple trunk line parameters based on the upstream power supply direction and each suspected fault route parameter; determining multiple branch line parameters based on the downstream power supply direction and each suspected fault route parameter; and constructing the fault diagnosis range based on all suspected fault route parameters, all trunk line parameters, and all branch line parameters.

[0006] Furthermore, the step of performing fault diagnosis on the open circuit fault diagnosis range according to preset first fault diagnosis conditions, preset zero-drop current, and preset zero-drop voltage to obtain phase line fault diagnosis results includes: extracting all the last branch parameters from the open circuit fault diagnosis range according to preset acquisition conditions; determining multiple last branch regions according to each last branch parameter; acquiring the three-phase load current and three-phase load voltage of each last branch region to obtain multiple three-phase load currents and multiple three-phase load voltages; and performing fault diagnosis on all three-phase load currents and all three-phase load voltages according to the first fault diagnosis conditions, zero-drop current, and zero-drop voltage to obtain phase line fault diagnosis results.

[0007] Further, the step of performing fault diagnosis on the load-side three-phase voltage to ground according to the preset neutral line fault diagnosis conditions to obtain the neutral line fault diagnosis result includes: obtaining the end neutral line current of each terminal branch region to obtain multiple terminal neutral line currents; performing offset calculation on the load-side three-phase voltage to ground and all terminal neutral line currents to obtain multiple adaptive offset thresholds; calculating the three-phase load voltage of each path according to the preset offset voltage calculation formula to obtain multiple neutral point approximate offset voltages; and performing fault diagnosis on the neutral point approximate offset voltage and the terminal neutral line current of each path according to the neutral line fault diagnosis conditions and multiple adaptive offset thresholds to obtain the neutral line fault diagnosis result.

[0008] Furthermore, the step of offsetting the three-phase voltage to ground and all terminal neutral currents on the load side to obtain multiple adaptive offset thresholds includes: calculating the three-phase voltage to ground and all terminal neutral currents on the load side according to a preset three-phase imbalance calculation formula to obtain multiple three-phase imbalances; analyzing each three-phase imbalance according to a preset piecewise function to obtain multiple actual imbalances; and offsetting each actual imbalance according to a preset offset threshold calculation formula to obtain multiple adaptive offset thresholds.

[0009] Further, the step of generating distribution network fault diagnosis results based on phase line fault diagnosis results and neutral line fault diagnosis results includes: analyzing the phase line fault diagnosis results according to a preset first judgment condition to obtain a first analysis result; if the first analysis result satisfies the first judgment condition, then analyzing the parameters of each terminal branch and each branch line according to the phase line fault diagnosis results and the preset first judgment condition to obtain a first fault analysis result; and generating distribution network fault diagnosis results based on a preset second judgment condition, the first fault analysis result, and the neutral line fault diagnosis result.

[0010] Further, the step of generating a distribution network fault diagnosis result based on a preset second judgment condition, a first fault analysis result, and a neutral line fault diagnosis result includes: analyzing the neutral line fault diagnosis result based on the second judgment condition to obtain a second analysis result; if the second analysis result satisfies the second judgment condition, then analyzing the parameters of each terminal branch and each branch line based on the preset second judgment condition and the neutral line fault diagnosis result to obtain a second fault analysis result; and generating a distribution network fault diagnosis result based on the first fault analysis result and the second fault analysis result.

[0011] Furthermore, a distribution network open circuit fault analysis device includes: a parameter acquisition module for acquiring all suspected fault route parameters from a preset distribution network fault diagnosis area to obtain multiple suspected fault route parameters; a range construction module for constructing an open circuit fault diagnosis range based on all suspected fault route parameters, a preset upstream power supply direction, and a preset downstream power supply direction; a first fault diagnosis module for performing fault diagnosis on the open circuit fault diagnosis range based on preset first fault diagnosis conditions, preset zero-drop current, and preset zero-drop voltage to obtain phase line fault diagnosis results; a second fault diagnosis module for acquiring the three-phase phase-to-ground voltage on the load side and performing fault diagnosis on the three-phase phase-to-ground voltage on the load side based on preset neutral line fault diagnosis conditions to obtain neutral line fault diagnosis results; and a fault diagnosis result generation module for generating distribution network fault diagnosis results based on the phase line fault diagnosis results and the neutral line fault diagnosis results.

[0012] Furthermore, a power distribution network disconnection fault analysis device is provided, comprising: a memory and at least one processor, wherein the memory stores instructions; at least the processor invokes the instructions in the memory to cause the power distribution network disconnection fault analysis device to perform the steps of the power distribution network disconnection fault analysis method as described above.

[0013] Furthermore, a computer-readable storage medium stores instructions that, when executed by a processor, implement the steps of the power distribution network disconnection fault analysis method described above.

[0014] In the technical solution of this invention, all parameters of suspected faulty lines are first collected and aggregated within a preset distribution network fault diagnosis area to identify target lines with fault symptoms, thus laying a solid data foundation for subsequent range delineation. Combining all parameters of suspected faulty lines with the fault diagnosis range constructed according to the upstream and downstream power supply directions, and clearly defining the topological characteristics of the final branch, the fault analysis boundary is clear and the judgment object is standardized. Based on the first fault diagnosis condition and the dual thresholds of zero-current and zero-voltage drops, a full-domain discrimination of the fault diagnosis range is performed, effectively distinguishing between faults and light-load or no-load normal operating conditions, avoiding load fluctuation interference, and identifying the phase of a broken phase and abnormal areas. By collecting the three-phase-to-ground voltage on the end load side as basic electrical quantities, voltage deviation and three-phase imbalance characteristics are captured locally, avoiding signal attenuation and distortion, and improving the sensitivity and stability of neutral line fault identification. Finally, the phase line fault diagnosis results and the neutral line fault diagnosis results are integrated to comprehensively judge the two types of faults, fully locking the fault type and impact range, and improving the completeness, accuracy, and efficiency of operation and maintenance emergency repair in distribution network fault diagnosis. Attached Figure Description

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a first flowchart of a power distribution network open circuit fault analysis method provided by an embodiment of the present invention; Figure 2 This is a second flowchart of a power distribution network line breakage fault analysis method provided by an embodiment of the present invention; Figure 3 This is a third flowchart of a power distribution network disconnection fault analysis method provided by an embodiment of the present invention; Figure 4 This is a fourth flowchart of a power distribution network open circuit fault analysis method provided by an embodiment of the present invention; Figure 5 A fifth flowchart of a power distribution network disconnection fault analysis method provided in an embodiment of the present invention; Figure 6 The sixth flowchart of a power distribution network disconnection fault analysis method provided in this embodiment of the invention; Figure 7 The seventh flowchart of a power distribution network open circuit fault analysis method provided in this embodiment of the invention; Figure 8 This is a schematic diagram of the structure of a power distribution network open circuit fault analysis device provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a power distribution network line breakage fault analysis device provided in an embodiment of the present invention. Detailed Implementation

[0016] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0017] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the distribution network line breakage fault analysis method of the present invention includes: 101. Collect all suspected fault route parameters from the preset distribution network fault diagnosis area to obtain multiple suspected fault route parameters; In this embodiment, all suspected faulty lines are identified, and parameters of all suspected faulty lines are uniformly collected and identified from the preset distribution network fault diagnosis area. Target lines with fault signs are screened out, providing a complete basic data source for the subsequent delineation of the fault diagnosis scope. By collecting suspected line information in advance, the pertinence and overall analysis efficiency of subsequent fault diagnosis are improved, laying a preliminary data foundation for the judgment of distribution network faults. 102. Based on all suspected fault route parameters, the preset upstream power supply direction, and the preset downstream power supply direction, the fault diagnosis range for line breakage is constructed. In this embodiment, the fault diagnosis range is constructed based on all suspected fault route parameters, all trunk line parameters, and all branch line parameters; all the last branches within the diagnosis range refer to branch lines that only have upstream nodes and no downstream nodes, that is, the line segment only supplies power to a single load point and is no longer divided into sub-branches to supply power to multiple load points. 103. Based on the preset first fault diagnosis conditions, preset zero-drop current and preset zero-drop voltage, perform fault diagnosis on the open circuit fault diagnosis range to obtain the phase line fault diagnosis result. In this embodiment, based on the preset first fault diagnosis condition and combined with the dual thresholds of zero-current and zero-voltage, a full-domain fault diagnosis is carried out within the defined open-circuit fault diagnosis range. The phase-line fault identification is achieved by relying on the current and voltage linkage criteria. It can effectively distinguish between real open-circuit faults and normal operating conditions such as light load and no load, and avoid misjudgment interference caused by load fluctuations. Through standardized threshold constraints, the diagnosis range is batch-analyzed, and reliable phase-line fault diagnosis results are quickly output, clarifying the fault phase and abnormal area, improving the real-time performance and anti-interference capability of the distribution network phase-line fault diagnosis, and providing solid data support for subsequent fault source tracing and location. 104. Collect the three-phase-to-ground voltage on the load side, and perform fault diagnosis on the three-phase-to-ground voltage on the load side according to the preset fault diagnosis conditions for neutral line failure, so as to obtain the fault diagnosis result of neutral line failure. In this embodiment, the three-phase-to-ground voltage on the load side is the real-time power frequency voltage between the A, B, and C phase lines of each of the three longest branch areas in the distribution network and the ground reference point, denoted as the ground voltage. Voltage to ground Voltage to ground By collecting the three-phase voltage to ground on the load side of each terminal branch area, and using the real-time power frequency voltage of the three-phase line to ground as the basic electrical sampling quantity, and relying on the preset fault diagnosis conditions for neutral line breakage, it can capture the characteristics of neutral point potential shift, three-phase load imbalance, and voltage anomalies caused by line breakage. Using the local voltage signal close to the end of the load as the diagnostic basis can avoid signal attenuation and distortion caused by line transmission, improve the sensitivity of fault feature identification, effectively support subsequent neutral point shift calculation, threshold matching, and neutral line breakage fault judgment, reduce the probability of misjudgment, provide an accurate data source for outputting reliable neutral line fault diagnosis results, and enhance the accuracy and stability of distribution network line breakage fault diagnosis. 105. Generate distribution network fault diagnosis results based on phase line fault diagnosis results and neutral line fault diagnosis results; In this embodiment, the phase line fault diagnosis results and the neutral line fault diagnosis results are integrated to unify and integrate the two types of fault identification information: phase line breakage and neutral line breakage. This allows for a comprehensive assessment of distribution network line breakage faults in one go. It can clearly distinguish fault types and pinpoint fault ranges, avoiding the one-sidedness of independent judgment of single faults, and providing a complete and reliable basis for judgment of distribution network fault isolation and line repair. In this embodiment, parameters of all suspected faulty lines are first collected and aggregated within a pre-defined distribution network fault diagnosis area to identify target lines exhibiting fault symptoms, thus laying a solid data foundation for subsequent range delineation. Combining all suspected faulty line parameters with the upstream and downstream power supply directions, a fault diagnosis range for open circuits is constructed. Simultaneously, the topological characteristics of the final branch are clearly defined, ensuring clear fault analysis boundaries and standardized assessment objects. Based on the first fault diagnosis condition and the dual thresholds of zero-current and zero-voltage drops, a comprehensive discrimination of the fault diagnosis range for open circuits is conducted. This effectively distinguishes open circuit faults from light-load and no-load normal operating conditions, avoids load fluctuation interference, and identifies the phase of a broken phase and abnormal areas. By collecting the three-phase-to-ground voltage on the end load side as basic electrical quantities, voltage deviation and three-phase imbalance characteristics are captured locally, avoiding signal attenuation and distortion, and improving the sensitivity and stability of neutral line fault identification. Finally, the phase line fault diagnosis results and neutral line fault diagnosis results are integrated to comprehensively assess the two types of open circuit faults, fully locking the fault type and impact range, and improving the completeness, accuracy, and efficiency of operation and maintenance emergency repair in distribution network fault diagnosis.

[0018] Please see Figure 2 A second embodiment of a power distribution network disconnection fault analysis method according to the present invention includes: 201. Determine the parameters of multiple main lines based on the upstream direction of power supply and the parameters of each suspected faulty line; In this embodiment, based on the identified suspected faulty line, the system traces upwards in the opposite direction of power transmission to identify all main lines that provide power support for the suspected faulty line. It extracts the main line parameters such as the corresponding line topology, electrical connection relationship, and power supply path, clarifies the possible upstream transmission path of the fault, and includes all main lines that may affect the power supply status of the suspected faulty line in the analysis scope. This avoids the failure to detect faults due to the disconnection of upstream lines and provides key upstream basis for the subsequent construction of a complete diagnostic boundary. 202. Determine the parameters of multiple branch lines based on the downstream direction of power supply and the parameters of each suspected faulty line; In this embodiment, starting from each suspected faulty line, the process is streamlined downwards along the direction of power transmission to identify all branch lines directly or indirectly powered by each suspected faulty line. Branch line parameters such as branch topology, load distribution, and terminal branch connections are extracted to fully cover the downstream load side range that may be affected after the fault occurs. This ensures that all terminal branches affected by the fault are included in the analysis, avoiding fault location deviations due to the omission of downstream branches, and providing complete downstream data support for the diagnostic scope. 203. Based on all suspected fault route parameters, all trunk line parameters, and all branch line parameters, the fault diagnosis range is constructed. In this embodiment, all suspected faulty lines are first identified, then all main lines supplying power to the suspected faulty lines are determined along the upstream direction of power supply, and all branch lines flowing through the suspected faulty lines are determined along the downstream direction of power supply. The parameters and topology information of the above three types of lines are analyzed to determine a clearly defined fault diagnosis range. This fault diagnosis range follows the physical characteristics of low-voltage distribution networks, where "faults will be propagated upstream and downstream along the power supply path, affecting the entire power supply chain," ensuring that subsequent fault judgments are only performed within the effective range, guaranteeing that the diagnostic logic is rigorous, the range is reasonable, and the results are reliable. In this embodiment, using the suspected faulty line as a benchmark, all main power supply lines are traced upwards and all branch lines are analyzed downwards, which can completely cover the fault propagation path and affected areas. It follows the physical characteristics of fault propagation along the upstream and downstream of the power supply path, ensuring that the boundary of the fault diagnosis range is clear and reasonable, effectively improving the accuracy and reliability of fault diagnosis. At the same time, the full-domain detection is transformed into limited area analysis, reducing the amount of data collection and computational redundancy, and improving diagnostic efficiency and real-time performance. This solution is adaptable to complex distribution network topologies, has clear logic, and is easy to automate. It can provide a reliable basis for subsequent phase-line and neutral-line fault judgment and location, effectively improving the fault operation and maintenance efficiency and power supply safety level of low-voltage distribution networks.

[0019] Please see Figure 3 A third embodiment of a power distribution network disconnection fault analysis method according to the present invention includes: 301. Extract all the parameters of the last branch from the fault diagnosis range of the broken wire according to the preset acquisition conditions; In this embodiment, the acquisition condition is that there are only upstream nodes and no downstream nodes in the branch line, that is, the line only supplies power to a single load point and is not further divided into sub-branches; the analysis boundary is the range of the line break fault diagnosis, and all branch lines within the range are traversed and screened according to the above acquisition conditions. The intermediate lines with lower-level branches are eliminated, and only the branch lines that meet the definition of the end are retained. The parameters of the last branch, such as the line number, topology location, power supply object, and electrical port information, are extracted to ensure that the extracted branch is the end point with the most significant electrical fault characteristics and the easiest to collect, so as to provide an effective analysis object for subsequent fault diagnosis; 302. Determine multiple terminal branch regions based on the parameters of each terminal branch; In this embodiment, based on the extracted last branch parameters, the regions are divided according to topological affiliation, power supply path, and electrical correlation. The last lines belonging to the same upstream power supply path and whose electrical characteristics change in tandem are classified into the same last branch region, forming multiple independent last branch regions with clear boundaries. Through regional division, the range of fault impact can be independently judged by region, avoiding mutual interference of electrical quantities in different branches, and improving the pertinence and accuracy of phase break and neutral break fault identification. 303. Obtain the three-phase load current and three-phase load voltage of each terminal branch region to obtain multiple three-phase load currents and multiple three-phase load voltages; In this embodiment, key electrical quantities of each terminal branch area are measured and collected to obtain the three-phase currents flowing through the load on each terminal branch, namely current IA, current IB, current IC, and the three-phase voltages of the load, namely voltage UAN′, voltage UBN′, voltage UCN′; the three-phase load currents and three-phase load voltages are used to identify phase-break faults. 304. Based on the first fault diagnosis condition, zero-drop current and zero-drop voltage, perform fault diagnosis on all three-phase load currents and all three-phase load voltages to obtain phase line fault diagnosis results; In this embodiment, the first fault diagnosis condition is: determining whether the load current of a certain phase or multiple phases in the current terminal branch area is less than the zero-drop current, and the load voltage of the corresponding phase line is simultaneously less than the zero-drop voltage; if the first fault diagnosis condition is met, it is determined that there is a phase-break fault in the terminal branch area or its upstream line, and the phase line with the phase current less than the zero-drop current is marked as the faulty phase line; the fault diagnosis principle and specific judgment logic are explained in detail with examples as follows: Single-phase phase-break fault judgment: if the load current IA of phase A on the terminal branch is less than the zero-drop current Ith, and the load voltage UAN' of phase A is less than the zero-drop voltage Uth, it indicates that the power supply circuit of phase A has been interrupted, and it is determined that a phase-break fault has occurred in the current phase A line or the upstream phase A line; Multi-phase phase-break fault judgment: if the load current IA of phase A is less than Ith, the load current IB of phase B is less than Ith, and the load voltage UAN' of phase A is less than Ith, it indicates that the power supply circuit of phase A has been interrupted, and a phase-break fault has occurred in the current phase A line or the upstream phase A line; If Uth and the load voltage UBN' of phase B are less than Uth, it indicates that the power supply circuits of both phases A and B are interrupted. It is determined that there is a phase-break fault in the current branch AB phase line or the upstream AB phase line. Other multi-phase faults such as three-phase breakage can be deduced by analogy. Distinguishing between no-load and fault: If the load current IC of phase C of the last branch is less than Ith, but the load voltage UCN' of phase C is greater than or equal to Uth, it means that phase C is only under light load or close to no-load, the power supply circuit is complete, and there is no phase-break fault. This can effectively avoid misjudgment caused by load fluctuation. The phase line fault diagnosis result is the primary electrical judgment conclusion of each last branch area within the fault diagnosis range. It is based on the three-phase load current, three-phase load voltage and zero-drop current and zero-drop voltage, and the output is the primary electrical judgment conclusion of each last branch to determine whether there is a phase-break fault, the specific fault phase, and the suspected fault section. In this embodiment, the parameters of the last branch are extracted from the fault diagnosis range of the open circuit fault by pre-set acquisition conditions. Independent terminal areas are divided according to topology and power supply path to provide a stable and reliable analysis object for fault diagnosis. The current and voltage of multiple three-phase loads are collected in each terminal area, which can truly reflect the open circuit anomaly and improve the effectiveness of the data. Based on the first fault diagnosis condition of current and voltage dual thresholds, single-phase and multi-phase open circuit faults can be accurately identified, and the open circuit and no-load conditions can be effectively distinguished. The misjudgment rate caused by load fluctuations can be reduced, and the phase line fault diagnosis results can be output quickly and reliably. The faulty phase line and fault range are clearly identified, which improves the real-time performance and anti-interference capability of open circuit fault diagnosis in low-voltage distribution network. It provides a solid basis for subsequent fault location and operation and maintenance, and effectively improves power supply reliability and fault handling efficiency.

[0020] Please see Figure 4 The fourth embodiment of a power distribution network disconnection fault analysis method in this invention includes: 401. Obtain the end neutral current of each terminal branch region to obtain multiple terminal neutral currents; In this embodiment, synchronous data acquisition is performed on each of the terminal branch regions to obtain the terminal neutral current corresponding to each terminal branch. It covers the current characteristics of each end power supply circuit, laying a solid foundation for subsequent neutral point approximate offset voltage calculation, adaptive threshold matching and fault diagnosis, and effectively improving the accuracy and comprehensiveness of neutral line failure fault identification. 402. Calculate the offset of the three-phase-to-ground voltage on the load side and all terminal neutral currents to obtain multiple adaptive offset thresholds; In this embodiment, based on the three-phase ground voltage and the neutral line current at the end of the load side, after the three-phase unbalance degree and piecewise function calculation, the offset threshold calculation formula is substituted into the formula to generate an adaptive offset threshold Uadp that is adapted to each branch, providing a dynamic criterion threshold for the neutral line failure. 403. Calculate the three-phase load voltage of each circuit according to the preset offset voltage calculation formula to obtain the approximate offset voltage of the neutral point of multiple circuits. In this embodiment, the neutral point approximate offset voltage formula is used to calculate the three-phase load voltage vectors of each path to obtain the neutral point approximate offset voltage for each path. : , ; In the formula, For the load voltage vector of phase A in the corresponding branch area at the end of the road, For the load voltage vector of phase B in the corresponding branch area at the end of the road, This represents the load voltage vector of phase C in the corresponding branch area at the end of the road; The approximate neutral point offset voltage for the corresponding circuit is approximately equivalent to the actual neutral point offset voltage. By directly collecting electrical quantities from each circuit in the terminal branch area, abnormal characteristics such as current drops and voltage shifts caused by wire breakage can be accurately captured, avoiding signal attenuation and distortion caused by transmission through intermediate circuits. This ensures that the data sources for each circuit are authentic and reliable, laying a data foundation for fault diagnosis of broken neutral and phase lines. At the same time, the approximate neutral point offset voltage must be controlled within a safe range (not higher than 24V). Combined with adaptive characteristics, this ensures the safety and reliability of the fault diagnosis process. 404. Based on the fault diagnosis conditions of the broken neutral line and multiple adaptive offset thresholds, fault diagnosis is performed on the approximate offset voltage of the neutral point of each path and the neutral line current at the end of each path to obtain the fault diagnosis results of the neutral line. In this embodiment, the fault diagnosis condition for a broken neutral line is as follows: if the approximate offset voltage magnitude of a neutral point is greater than the corresponding adaptive offset threshold, then it is determined that there is a risk of a broken neutral line fault in the terminal branch area and the upstream power supply path; based on this, if the neutral line current at the terminal of the line is less than the zero-current, then a broken neutral line fault is diagnosed in the current branch neutral line or the upstream neutral line; since the three-phase load is difficult to be completely balanced for a long time in the actual operation of the low-voltage distribution network, the neutral line current will not be continuously zero under normal operating conditions, so the zero current interference caused by the three-phase balance is excluded to avoid misjudgment; through "offset voltage exceeding limit and The criterion of "neutral current returning to zero" can distinguish between a neutral line fault and normal voltage deviation, accurately locate the faulty branch and its upstream range, and output a reliable neutral line fault diagnosis result. The neutral line fault diagnosis result is obtained by calculating the approximate neutral point deviation voltage and adaptive deviation threshold based on the locally collected terminal neutral line current and three-phase load voltage at the level of each terminal branch area. Then, according to the neutral line fault diagnosis conditions, each terminal branch is compared with the electrical characteristic threshold one by one. The resulting preliminary hierarchical judgment conclusion on whether each terminal branch has a risk of neutral line fault and whether a neutral line fault has been diagnosed is obtained. In this embodiment, by collecting the neutral line current at the end of each branch area, and relying on the three-phase ground voltage and neutral line current on the load side, the three-phase unbalance and actual unbalance are calculated sequentially, and adaptive offset thresholds are generated for each branch. This enables dynamic adjustment of the fault criterion threshold. The approximate neutral point offset voltage of each circuit is solved by using three-phase load voltage vector calculation. Local collection of electrical quantities at the end can avoid signal attenuation and distortion in intermediate lines, ensuring the authenticity and validity of the data. At the same time, the approximate neutral point offset voltage is limited to a safe range, improving operational safety. The joint criterion of neutral point approximate offset voltage exceeding the limit and end neutral line current drop is adopted. Combined with the actual working condition that the three-phase load of the low-voltage distribution network is difficult to balance for a long time, normal zero current interference is eliminated, effectively distinguishing between conventional load imbalance and neutral line break faults, locking the faulty branch and upstream range, and improving the accuracy, anti-interference capability, and operation and maintenance efficiency of low-voltage distribution network neutral line break fault diagnosis.

[0021] Please see Figure 5 The fifth embodiment of a power distribution network disconnection fault analysis method in this invention includes: 501. Calculate the three-phase voltage to ground on the load side and all the neutral currents at the end according to the preset three-phase unbalance calculation formula to obtain multiple three-phase unbalances. In this embodiment, the three-phase voltage to ground on the load side, the voltage to ground UA, the voltage to ground UB, the voltage to ground UC, and the neutral line current corresponding to each terminal branch are used. Based on the calculation, we substitute each value into the three-phase unbalance calculation formula to obtain the three-phase unbalance κ corresponding to each end branch: , In the formula, κ is used to quantify the real-time imbalance of the three-phase system; the greater the load imbalance during normal operation, the larger κ is; when a neutral line fault occurs, the neutral line current... When κ is zero, it is always 0. This formula can transform the imbalance state into a standardized value, providing a quantitative basis for subsequent adaptive threshold calculation and enabling accurate characterization of the degree of imbalance in each terminal branch. 502. Analyze the unbalance of each three phase according to the preset piecewise function to obtain multiple actual unbalances; In this embodiment, a piecewise function is constructed. The expression used to generate the actual imbalance is: , Substitute the calculated three-phase unbalance κ from each end branch into the piecewise function λ(κ) to obtain the corresponding actual unbalance λ: when the actual unbalance κ < 0.1, λ = 0; when the actual unbalance κ ≥ 0.1, λ = κ. Simultaneously, set the base operating voltage. =12V, which is half of the safe voltage 24V. Under the premise of ensuring personal safety and avoiding dangerous contact voltage on the equipment casing caused by the neutral line failure, the piecewise function can generate the corresponding actual imbalance degree according to each three-phase imbalance degree, effectively overcome the limitations of the fixed threshold, reduce the dependence on manual setting threshold, and improve the adaptability and anti-interference ability of the neutral line failure judgment under different load conditions. 503. Calculate the offset for each actual imbalance according to the preset offset threshold calculation formula to obtain multiple adaptive offset thresholds; In this embodiment, each actual imbalance degree λ is substituted into the offset threshold calculation formula to obtain multiple adaptive offset thresholds Uadp: The adaptive offset threshold Uadp is corrected in real time based on the three-phase ground voltage on the load side and the neutral line current at each end. It can adaptively adjust the threshold value according to each actual imbalance. Under normal imbalance conditions, the threshold is increased to avoid false operation. In the event of a neutral line failure, the threshold is automatically reduced to ensure reliable operation. This realizes the dynamic adaptive adjustment of the protection criteria and provides a dynamic and safe threshold benchmark for subsequent neutral point approximate offset voltage judgment, effectively improving the accuracy and safety of neutral line failure diagnosis. In this embodiment, multiple three-phase unbalances are calculated based on the three-phase voltage to ground on the load side and the neutral current at each end, which can accurately characterize the three-phase unbalance state of each branch and provide a reliable quantitative basis for adaptive adjustment. The actual unbalance is generated by the piecewise function λ(κ), which can dynamically adapt to load changes, overcome the limitations of fixed thresholds, reduce reliance on manual setting, and improve the universality and anti-interference capability of the criterion. The adaptive offset threshold Uadp can be used to increase the threshold under normal operating conditions to prevent false operation and decrease the threshold to ensure reliable operation during neutral line failure, taking into account both safety and sensitivity. The overall dynamic adaptive adjustment of the protection criterion is realized, providing a benchmark for the judgment of the approximate offset voltage of the neutral point, effectively improving the accuracy, reliability and safety of neutral line failure diagnosis, and adapting to complex low-voltage distribution network conditions.

[0022] Please see Figure 6 The sixth embodiment of a distribution network line disconnection fault analysis method in this invention includes: 601. Analyze the phase line fault diagnosis results according to the preset first judgment conditions to obtain the first analysis result; In this embodiment, the first judgment condition requires that all the last branches under the current line be diagnosed with phase-break faults, forming a consistent fault characteristic across the entire region, providing a reliable preliminary judgment basis for subsequent phase-break fault section location. 602. If the first analysis result satisfies the first judgment condition, then the parameters of each terminal branch and each branch line are analyzed according to the phase line fault diagnosis result and the preset first judgment condition to obtain the first fault analysis result. In this embodiment, both the first judgment condition and the first judgment condition must be met simultaneously for it to be determined that a phase-break fault within the diagnostic range occurs on the current line. When the phase-line fault diagnosis result meets the preset first judgment condition, the parameters of each terminal branch and each branch line are retrieved by combining the existing phase-line fault diagnosis results with the preset first judgment condition. Topology correlation analysis and comprehensive comparison analysis of electrical fault characteristics are carried out to derive the first fault analysis result. The first judgment condition includes upstream topology backtracking constraints, tracing back to the upstream power supply node of the current line, and checking the power supply coverage of the upstream node. If the upstream node supplies power to other branch lines in addition to supplying power to the current line, then it is required that no phase-break fault has been diagnosed on the remaining branch lines and all their terminal branches. By combining end-of-line fault consistency verification with upstream adjacent line fault-free verification, and relying on line topology and branch parameters for cross-comparison and judgment, it is possible to trace and distinguish the faulty section of the phase-break line, effectively identifying whether the fault occurs on the phase line of the end branch itself or on the phase line of the upstream common trunk line. The first fault analysis result can clarify the scope of the end branch under the jurisdiction of the fault, lock the faulty phase line and the faulty section, eliminate the interference of faults in adjacent lines, and complete the fault section location, fault type confirmation and impact range delineation. This provides a reliable judgment basis for subsequent fault isolation and line repair, and gives a fault tracing conclusion that can be directly used for operation and maintenance. If the above first judgment condition and the first judgment condition are met at the same time, it can be clearly determined that the phase-break line within the diagnostic range has a phase-break line fault on the current line. 603. Generate distribution network fault diagnosis results based on the preset second judgment conditions, the first fault analysis results, and the neutral line fault diagnosis results; In this embodiment, based on the preset second judgment condition, combined with the first fault analysis result and the neutral line fault diagnosis result, the judgment conclusions of two types of faults, namely phase line failure and neutral line failure, are integrated in a comprehensive manner. Through the consistency verification of terminal electrical characteristics and upstream topology backtracking constraints, it is possible to distinguish whether the fault occurs in the branch itself or the upstream main line, effectively avoiding misjudgment interference caused by load fluctuations and measurement deviations. A complete distribution network fault diagnosis result is generated in a comprehensive manner, clearly defining the fault type, fault section and impact range, providing a basis for fault isolation and line emergency repair, and improving the accuracy of distribution network line failure diagnosis and operation and maintenance efficiency. In this embodiment, the phase line fault diagnosis results are analyzed hierarchically based on a preset first judgment condition. The consistent characteristic of detecting phase line faults across all the terminal branches of the line is used to establish a preliminary judgment benchmark for fault section location. By combining the first judgment condition with the terminal branch parameters and branch line parameters, topological correlation analysis and electrical feature comparison are performed. Relying on upstream power supply node backtracking verification, it is determined whether the phase line fault occurred on the terminal branch's own phase line or on the upstream common trunk line phase line, clarifying the faulty phase line, fault section, and affected area, effectively eliminating interference from adjacent line faults. Then, combining the preset second judgment condition, the first fault analysis results and the neutral line fault diagnosis results are integrated to uniformly collect the judgment conclusions for both phase line and neutral line faults. Relying on terminal feature verification and topological backtracking constraints, misjudgment problems caused by load fluctuations and measurement errors are avoided, fully realizing fault characterization, section location, and range delineation. This provides a reliable basis for distribution network fault isolation and line emergency repair, effectively improving the accuracy of line fault diagnosis, the reliability of judgment, and the efficiency of operation and maintenance.

[0023] Please see Figure 7 The seventh embodiment of a power distribution network disconnection fault analysis method according to the present invention includes: 701. Analyze the centerline fault diagnosis results based on the second judgment condition to obtain the second analysis result; In this embodiment, the second judgment condition specifically requires that all the last branches under the current line must exhibit electrical abnormality characteristics where the neutral point approximate offset voltage is greater than the corresponding adaptive offset threshold. If the current line itself is the last branch, then the constraint condition that the neutral line current at the end of the branch is less than the zero-drop current must be met in addition, so as to provide a reliable preliminary judgment basis for the location of the subsequent neutral line fault section. 702. If the second analysis result satisfies the second judgment condition, then the parameters of each terminal branch and each branch line are analyzed according to the preset second judgment condition and the center line fault diagnosis result to obtain the second fault analysis result. In this embodiment, both the second and second judgment conditions must be met simultaneously to determine that a neutral-line fault within the diagnostic range occurs on the current line. When the neutral-line fault diagnosis result meets the second judgment condition, the parameters of each terminal branch and each level of branch line are retrieved for topological correlation and electrical characteristic comprehensive analysis to derive the second fault analysis result. The second judgment condition includes upstream topological backtracking constraints, tracing back to the upstream power supply node of the current line. If the upstream node supplies power to the current line and is also a power supply branch line, then the remaining branch lines and all their terminal branches must be free from neutral-line fault risk. The combination of end-point full-domain anomaly consistency verification and upstream adjacent line risk-free verification, relying on the cross-comparison of line topology and branch parameters, can achieve fault segment tracing and differentiation, and distinguish whether the fault occurs in the end branch itself or in the upstream common trunk line; the second fault analysis result clarifies the scope of the end branch under the jurisdiction of the fault, eliminates the possibility of faults in adjacent lines, completes the fault segment location, fault type confirmation and impact range delineation, provides a judgment basis for subsequent fault isolation and line repair, and gives a fault tracing conclusion that can be directly used for operation and maintenance; if the above second judgment condition is met, it can be clearly determined that the neutral line fault within the diagnostic range occurs in the neutral line section of the current line; 703. Generate distribution network fault diagnosis results based on the first fault analysis results and the second fault analysis results; In this embodiment, by integrating the results of the first and second fault analyses, the judgment conclusions of two types of faults, namely phase-break and neutral-break, can be coordinated simultaneously. The fault type, fault section, fault phase, and impact range at the end are integrated. Relying on the dual constraints of end branch electrical characteristic verification and upstream topology backtracking, the fault location can be identified as either the branch itself or the upstream main line. This effectively avoids misjudgments caused by load imbalance and measurement errors, and comprehensively generates complete distribution network fault diagnosis results. This achieves unified fault characterization, location, and range delineation, thereby improving the efficiency of distribution network line break fault diagnosis and operation and maintenance repair. In this embodiment, the fault diagnosis results of the neutral line are pre-verified through the second judgment condition. Combined with the consistency of voltage offset across the entire terminal area and the neutral line current constraint at the terminal, a reliable preliminary basis is provided for locating the fault section of the broken neutral line. Then, through the upstream topology backtracking constraint of the second judgment condition, combined with the topological correlation and electrical characteristic comparison of the terminal branch and line parameters, the fault is identified as being located on the terminal branch itself or the upstream common trunk line, clarifying the fault range, eliminating cascading interference, and generating the second fault analysis result. Finally, the first fault analysis result and the second fault analysis result are integrated, coordinating the two types of faults, namely, broken phase line and broken neutral line, integrating the fault type, phase, section, and impact range, avoiding misjudgments caused by load imbalance and measurement errors, realizing unified fault characterization, location, and range delineation, providing a direct basis for fault isolation and emergency repair, improving the accuracy of distribution network fault diagnosis and operation and maintenance efficiency, and ensuring power supply reliability.

[0024] The above describes a method for analyzing power distribution network disconnection faults according to an embodiment of the present invention. The following describes a device for analyzing power distribution network disconnection faults according to an embodiment of the present invention. Please refer to [link / reference]. Figure 8 One embodiment of the power distribution network disconnection fault analysis device of the present invention includes: Parameter acquisition module 1 is used to acquire all suspected fault route parameters from the preset distribution network fault diagnosis area to obtain multiple suspected fault route parameters; Range construction module 2 is used to construct the fault diagnosis range based on all suspected fault route parameters, preset upstream power supply direction and preset downstream power supply direction; The first fault diagnosis module 3 is used to perform fault diagnosis on the open circuit fault diagnosis range according to the preset first fault diagnosis conditions, the preset zero-drop current and the preset zero-drop voltage, so as to obtain the phase line fault diagnosis result. The second fault diagnosis module 4 is used to collect the three-phase voltage to ground on the load side and perform fault diagnosis on the three-phase voltage to ground on the load side according to the preset fault diagnosis conditions for neutral line failure, so as to obtain the neutral line fault diagnosis result. Fault diagnosis result generation module 5 is used to generate distribution network fault diagnosis results based on phase line fault diagnosis results and neutral line fault diagnosis results. In this embodiment, parameters of all suspected faulty lines are first collected and aggregated within a pre-defined distribution network fault diagnosis area to identify target lines exhibiting fault symptoms, thus laying a solid data foundation for subsequent range delineation. Combining all suspected faulty line parameters with the upstream and downstream power supply directions, a fault diagnosis range for open circuits is constructed. Simultaneously, the topological characteristics of the final branch are clearly defined, ensuring clear fault analysis boundaries and standardized assessment objects. Based on the first fault diagnosis condition and the dual thresholds of zero-current and zero-voltage drops, a comprehensive discrimination of the fault diagnosis range for open circuits is conducted. This effectively distinguishes open circuit faults from light-load and no-load normal operating conditions, avoids load fluctuation interference, and identifies the phase of a broken phase and abnormal areas. By collecting the three-phase-to-ground voltage on the end load side as basic electrical quantities, voltage deviation and three-phase imbalance characteristics are captured locally, avoiding signal attenuation and distortion, and improving the sensitivity and stability of neutral line fault identification. Finally, the phase line fault diagnosis results and neutral line fault diagnosis results are integrated to comprehensively assess the two types of open circuit faults, fully locking the fault type and impact range, and improving the completeness, accuracy, and efficiency of operation and maintenance emergency repair in distribution network fault diagnosis.

[0025] Figure 9 This is a schematic diagram of the structure of a power distribution network disconnection fault analysis device 900 provided in an embodiment of the present invention. This power distribution network disconnection fault analysis device 900 can vary significantly due to different configurations or performance. It may include one or more central processing units (CPUs) 910 (e.g., one or more processors) and a memory 920, and one or more storage media 930 (e.g., one or more mass storage devices) storing application programs 933 or data 932. The memory 920 and storage media 930 can be temporary or persistent storage. The program stored in the storage media 930 may include one or more modules (not shown in the diagram), each module may include a series of instruction operations on the power distribution network disconnection fault analysis device 900. Furthermore, the processor 910 may be configured to communicate with the storage media 930 and execute a series of instruction operations in the storage media 930 on the power distribution network disconnection fault analysis device 900 to implement the steps of the power distribution network disconnection fault analysis method provided in the above-described method embodiments.

[0026] A power distribution network disconnection fault analysis device 900 may further include one or more power supplies 940, one or more wired or wireless network interfaces 950, one or more input / output interfaces 960, and / or one or more operating systems 931, such as Windows Server, MacOSX, Unix, Linux, FreeBSD, etc. Those skilled in the art will understand that... Figure 9The illustrated structure of a power distribution network disconnection fault analysis device does not constitute a limitation on a power distribution network disconnection fault analysis device. It may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0027] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of a power distribution network disconnection fault analysis method.

[0028] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system, device, or unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0029] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0030] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for analyzing power distribution network open circuit faults, characterized in that, include: Collect all suspected fault route parameters from the preset distribution network fault diagnosis area to obtain multiple suspected fault route parameters; The fault diagnosis range is constructed based on all suspected fault route parameters, the preset upstream power supply direction, and the preset downstream power supply direction. Based on the preset first fault diagnosis conditions, preset zero-drop current and preset zero-drop voltage, the fault diagnosis range of the open circuit fault is diagnosed to obtain the phase line fault diagnosis result. The three-phase voltage to ground on the load side is collected, and the three-phase voltage to ground on the load side is diagnosed according to the preset fault diagnosis conditions for neutral line failure, so as to obtain the neutral line fault diagnosis result. The distribution network fault diagnosis results are generated based on the phase line fault diagnosis results and the neutral line fault diagnosis results.

2. The method for analyzing power distribution network line disconnection faults as described in claim 1, characterized in that, The fault diagnosis range is constructed based on all suspected fault route parameters, preset upstream power supply direction, and preset downstream power supply direction, including: Multiple trunk line parameters were determined based on the upstream power supply direction and parameters of each suspected faulty route. Parameters of multiple branch lines were determined based on the downstream direction of power supply and the parameters of each suspected faulty route. The range of fault diagnosis is constructed based on all suspected fault route parameters, all trunk line parameters, and all branch line parameters.

3. The method for analyzing power distribution network line disconnection faults as described in claim 2, characterized in that, The step of performing fault diagnosis on the open-circuit fault diagnosis range based on preset first fault diagnosis conditions, preset zero-drop current, and preset zero-drop voltage to obtain phase line fault diagnosis results includes: Based on preset acquisition conditions, all terminal branch parameters are extracted from the range of open circuit fault diagnosis. Multiple terminal branch regions are determined based on the parameters of each terminal branch. Obtain the three-phase load current and three-phase load voltage of each of the last branch regions to obtain multiple three-phase load currents and multiple three-phase load voltages; Based on the first fault diagnosis condition, zero-drop current, and zero-drop voltage, fault diagnosis is performed on all three-phase load currents and all three-phase load voltages to obtain phase line fault diagnosis results.

4. The method for analyzing power distribution network line disconnection faults as described in claim 3, characterized in that, The step of performing fault diagnosis on the three-phase phase-to-ground voltage on the load side according to preset neutral line fault diagnosis conditions to obtain neutral line fault diagnosis results includes: Obtain the end neutral current of each of the last branch regions to obtain multiple end neutral currents; Offset calculations are performed on the three-phase phase-to-ground voltages on the load side and all terminal neutral currents to obtain multiple adaptive offset thresholds; The three-phase load voltage of each circuit is calculated according to the preset offset voltage calculation formula to obtain the approximate offset voltage of the neutral point of multiple circuits. Based on the fault diagnosis conditions of the neutral line break and multiple adaptive offset thresholds, fault diagnosis is performed on the approximate offset voltage of the neutral point of each path and the neutral line current at the end of each path to obtain the neutral line fault diagnosis results.

5. The method for analyzing power distribution network line breakage faults as described in claim 4, characterized in that, The offset calculation is performed on the three-phase phase-to-ground voltage on the load side and all terminal neutral currents to obtain multiple adaptive offset thresholds, including: The three-phase unbalance is calculated based on the preset three-phase unbalance calculation formula to obtain multiple three-phase unbalance values. The unbalance of each three phase is analyzed according to the preset piecewise function to obtain multiple actual unbalances; The offset is calculated for each actual imbalance according to the preset offset threshold calculation formula to obtain multiple adaptive offset thresholds.

6. The method for analyzing power distribution network line disconnection faults as described in claim 3, characterized in that, The process of generating distribution network fault diagnosis results based on phase line fault diagnosis results and neutral line fault diagnosis results includes: The phase line fault diagnosis results are analyzed according to the preset first judgment conditions to obtain the first analysis result; If the first analysis result satisfies the first judgment condition, then the parameters of each terminal branch and each branch line are analyzed according to the phase line fault diagnosis result and the preset first judgment condition to obtain the first fault analysis result. The distribution network fault diagnosis results are generated based on the preset second judgment conditions, the first fault analysis results, and the neutral line fault diagnosis results.

7. The method for analyzing power distribution network line breakage faults as described in claim 6, characterized in that, The step of generating distribution network fault diagnosis results based on preset second judgment conditions, first fault analysis results, and neutral line fault diagnosis results includes: The centerline fault diagnosis results are analyzed based on the second judgment condition to obtain the second analysis result; If the second analysis result satisfies the second judgment condition, then the parameters of each terminal branch and each branch line are analyzed according to the preset second judgment condition and the center line fault diagnosis result to obtain the second fault analysis result. The distribution network fault diagnosis results are generated based on the first fault analysis results and the second fault analysis results.

8. A power distribution network open circuit fault analysis device, characterized in that, include: The parameter acquisition module is used to collect all suspected fault route parameters from the preset distribution network fault diagnosis area to obtain multiple suspected fault route parameters; The range construction module is used to construct the fault diagnosis range based on all suspected fault route parameters, the preset upstream power supply direction, and the preset downstream power supply direction. The first fault diagnosis module is used to perform fault diagnosis on the open circuit fault diagnosis range according to the preset first fault diagnosis conditions, the preset zero-drop current and the preset zero-drop voltage, so as to obtain the phase line fault diagnosis result. The second fault diagnosis module is used to collect the three-phase voltage to ground on the load side and perform fault diagnosis on the three-phase voltage to ground on the load side according to the preset fault diagnosis conditions for neutral line failure, so as to obtain the neutral line fault diagnosis result. The fault diagnosis result generation module is used to generate distribution network fault diagnosis results based on phase line fault diagnosis results and neutral line fault diagnosis results.

9. A power distribution network open circuit fault analysis device, characterized in that, The power distribution network disconnection fault analysis device includes: a memory and at least one processor, wherein the memory stores instructions; At least one of the processors invokes the instructions in the memory to cause the power distribution network disconnection fault analysis device to perform the steps of the power distribution network disconnection fault analysis method as described in any one of claims 1-7.

10. A computer-readable storage medium storing instructions thereon, characterized in that, When the instructions are executed by the processor, they implement the steps of the power distribution network disconnection fault analysis method as described in any one of claims 1-7.

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