A method and device for detecting the fusing of a fuse on the high voltage side of a distribution transformer

Abstract

This invention relates to the field of distribution network operation and maintenance monitoring technology, and discloses a method and device for detecting fuse failure on the high-voltage side of a distribution transformer. The method includes: acquiring the low-voltage sequence component and low-voltage current sequence component of the low-voltage side of the distribution transformer; then, when the voltage amplitude of the negative sequence component of the low-voltage voltage is greater than the negative sequence voltage initiation threshold, determining the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the low-voltage sequence component and the low-voltage current sequence component; determining the three-phase voltage amplitude; marking the phase with the lowest voltage amplitude as the amplitude characteristic phase; and marking the other two phases as phase characteristic phases; finally, determining the voltage phase of the two phase characteristic phases; and determining whether a fuse has failed on the amplitude characteristic phase based on the voltage phase of the two phase characteristic phases. In other words, by inverting high-voltage side data from low-voltage side data and utilizing real-time data processing, the method solves the problems existing in the prior art.

Description

Technical Field

[0001] This invention relates to the field of power distribution network operation and maintenance monitoring technology, and in particular to a method and device for detecting fuse failure on the high-voltage side of a power distribution transformer. Background Technology

[0002] In the operation and maintenance of 10kV distribution networks, high-voltage side fuses of distribution transformers serve as critical protection devices, playing a vital role in isolating internal or low-voltage side short-circuit faults and protecting the transformers and upstream power grids. However, rapid fault detection and location after fuse blowing has long faced technical bottlenecks: traditional operation and maintenance heavily rely on manual line inspections or user reports of repairs. The former is inefficient and results in delayed power restoration, while the latter indicates that the fault has been ongoing, severely compromising power supply reliability. Existing technologies attempt to achieve monitoring by installing sensors such as fuse-triggered pin indicators on the high-voltage side, but the high-voltage working environment makes installation inconvenient and costly, and still requires manual on-site confirmation, making it difficult to meet the large-scale monitoring needs of the massive number of distribution transformers in the distribution network, thus hindering practical promotion. Summary of the Invention

[0003] Based on this, it is necessary to propose a method and device for detecting fuse failure on the high-voltage side of distribution transformers to address the above problems. This avoids the installation difficulties and costs associated with direct monitoring on the high-voltage side, and improves the real-time performance, anti-interference capability, and accuracy of fault detection. Compared with traditional manual line inspection and high-voltage side sensor solutions, it has significant advantages in terms of cost, efficiency, and reliability, and effectively solves the problem of large-scale application of rapid detection of fuse failure in distribution networks.

[0004] To achieve the above objectives, the present invention provides, in a first aspect, a method for detecting fuse failure on the high-voltage side of a distribution transformer, the method comprising: Obtain the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current on the low-voltage side of the distribution transformer. When the voltage amplitude of the negative sequence component of the low voltage is greater than the negative sequence voltage initiation threshold, the high-voltage three-phase voltage vector of the high-voltage side of the distribution transformer is determined based on the positive sequence component of the low voltage, the negative sequence component of the low voltage, the zero sequence component of the low voltage, the positive sequence component of the low voltage current, the negative sequence component of the low voltage current, and the zero sequence component of the low voltage current. Based on the high-voltage three-phase voltage vector, the three-phase voltage amplitude is determined, and the phase with the lowest voltage amplitude is marked as the amplitude characteristic phase, and the other two phases are marked as phase characteristic phases; Based on the high-voltage three-phase voltage vector, the voltage phases of the two phase characteristic phases are determined, and based on the voltage phases of the two phase characteristic phases, it is determined whether the amplitude characteristic phase has experienced fuse failure.

[0005] Optionally, determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phases of the two phase characteristic phases includes: Based on the voltage phase of the two phase characteristic phases and the voltage amplitude of the amplitude characteristic phase, it is determined whether the fuse of the amplitude characteristic phase has blown.

[0006] Optionally, determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phases of the two phase characteristic phases and the voltage amplitude of the amplitude characteristic phase includes: Determine the absolute value of the voltage phase difference between the voltage phases of two phase characteristic phases; Based on the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, it is determined whether the fuse of the amplitude characteristic phase has blown.

[0007] Optionally, determining whether a fuse has blown in the amplitude characteristic phase based on the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, includes: If the absolute value of the voltage phase difference is greater than the voltage phase characteristic threshold, and the voltage amplitude of the amplitude characteristic phase is less than the voltage amplitude characteristic threshold, it is determined that the fuse of the amplitude characteristic phase has blown. If the absolute value of the voltage phase difference is less than or equal to the voltage phase characteristic threshold, and / or the voltage amplitude of the amplitude characteristic phase is greater than or equal to the voltage amplitude characteristic threshold, it is determined that the fuse in the amplitude characteristic phase has not blown.

[0008] Optionally, determining the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current includes: Obtain the voltage transformation ratio of the high-voltage side to the low-voltage side of the distribution transformer, and the lead angle of the high-voltage side over the low-voltage side; The high-voltage three-phase voltage vector is determined based on the voltage transformation ratio, the lead angle, the positive sequence component of the low-voltage voltage, the negative sequence component of the low-voltage voltage, the zero sequence component of the low-voltage voltage, the positive sequence component of the low-voltage current, the negative sequence component of the low-voltage current, and the zero sequence component of the low-voltage current.

[0009] Optionally, determining the high-voltage three-phase voltage vector based on the voltage transformation ratio, the lead angle, the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current includes: Obtain the calculation model for low-voltage inversion of high-voltage from the distribution transformer; Using the low-voltage inversion high-voltage calculation model, the high-voltage three-phase voltage vector is determined based on the voltage ratio, the lead angle, the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current.

[0010] Optionally, the calculation model for low-voltage voltage inversion to high-voltage voltage is as follows: ; in, , and These refer to the A-phase voltage vector, B-phase voltage vector, and C-phase voltage vector in the aforementioned high-voltage three-phase voltage vector. The voltage transformation ratio is mentioned above. It is the three-phase rotation factor. It is the orthogonal rotation factor. The positive sequence component of the low voltage. It is a negative rotation factor. This refers to the negative sequence component of the low-voltage voltage. The low-voltage zero-sequence component, This refers to the zero-sequence component of the low-voltage current. This refers to the positive sequence component of the low-voltage current. This refers to the negative sequence component of the low-voltage current. For natural numbers, The imaginary unit, The aforementioned leading angle.

[0011] Optionally, the method further includes: If the voltage amplitude of the negative sequence component of the low voltage is less than or equal to the negative sequence voltage activation threshold, it is determined that no fuse has blown.

[0012] Optionally, obtaining the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage side of the distribution transformer includes: Obtain the low-voltage three-phase voltage vector and low-voltage three-phase current vector on the low-voltage side of the distribution transformer; Based on the low-voltage three-phase voltage vector, determine the positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage voltage; Based on the low-voltage three-phase current vector, the positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current are determined.

[0013] To achieve the above objectives, the present invention provides a fuse failure detection device on the high-voltage side of a distribution transformer in a second aspect, the device comprising: The acquisition module is used to acquire the positive sequence component, negative sequence component, zero sequence component, positive sequence component, negative sequence component, and zero sequence component of the low-voltage current on the low-voltage side of the distribution transformer. The judgment and determination module is used to determine the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the low-voltage positive-sequence component, the low-voltage negative-sequence component, the low-voltage zero-sequence component, the low-voltage positive-sequence component, the low-voltage negative-sequence component, and the low-voltage zero-sequence component when the voltage amplitude of the low-voltage negative-sequence component is greater than the negative-sequence voltage initiation threshold. The determination and marking module is used to determine the three-phase voltage amplitude based on the high-voltage three-phase voltage vector, mark the phase with the lowest voltage amplitude as the amplitude characteristic phase, and mark the other two phases as phase characteristic phases; The determination module is used to determine the voltage phase of two phase characteristic phases based on the high-voltage three-phase voltage vector, and to determine whether the amplitude characteristic phase has experienced fuse blowing based on the voltage phase of the two phase characteristic phases.

[0014] To achieve the above objectives, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform a fuse-breaking detection method on the high-voltage side of a distribution transformer as described in any one of the first aspects.

[0015] To achieve the above objectives, the present invention provides a computer device in a fourth aspect, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform a fuse-breaking detection method on the high-voltage side of a distribution transformer as described in any one of the first aspects.

[0016] The present invention has the following beneficial effects: The above method obtains the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage side of the distribution transformer. Then, when the voltage amplitude of the negative-sequence component of the low-voltage voltage is greater than the negative-sequence voltage initiation threshold, the high-voltage three-phase voltage vector of the high-voltage side of the distribution transformer is determined based on the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current. Then, based on the high-voltage three-phase voltage vector, the three-phase voltage amplitude is determined, and the phase with the lowest voltage amplitude is marked as... The amplitude characteristic phase is identified, and the other two phases are also marked as phase characteristic phases. Finally, based on the high-voltage three-phase voltage vector, the voltage phases of the two phase characteristic phases are determined, and based on the voltage phases of the two phase characteristic phases, it is determined whether the amplitude characteristic phase has experienced fuse failure. In other words, by inverting high-voltage side data from low-voltage side data, the installation difficulty and cost problems of direct monitoring on the high-voltage side are avoided. At the same time, by utilizing real-time data processing, the real-time performance, anti-interference ability and accuracy of fault detection are improved. Compared with traditional manual line inspection and high-voltage side sensor solutions, it has significant advantages in terms of cost, efficiency and reliability, and effectively solves the problem of large-scale application of rapid detection of fuse failure in distribution networks. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] in: Figure 1 This is a schematic diagram of a fuse failure detection method on the high-voltage side of a distribution transformer according to an embodiment of this application; Figure 2 This is a schematic diagram of a fuse failure detection device on the high-voltage side of a distribution transformer according to an embodiment of this application; Figure 3 This is a diagram showing the internal structure of a computer device in some embodiments. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the operation and maintenance of 10kV distribution networks, high-voltage side fuses of distribution transformers serve as critical protection devices, playing a vital role in isolating internal or low-voltage side short-circuit faults and protecting the transformers and upstream power grids. However, rapid fault detection and location after fuse blowing has long faced technical bottlenecks: traditional operation and maintenance heavily rely on manual line inspections or user reports of repairs. The former is inefficient and results in delayed power restoration, while the latter indicates that the fault has been ongoing, severely compromising power supply reliability. Existing technologies attempt to achieve monitoring by installing sensors such as fuse-triggered pin indicators on the high-voltage side, but the high-voltage working environment makes installation inconvenient and costly, and still requires manual on-site confirmation, making it difficult to meet the large-scale monitoring needs of the massive number of distribution transformers in the distribution network, thus hindering practical promotion.

[0021] To address the aforementioned issues, this application proposes a method and device for detecting fuse failure on the high-voltage side of a distribution transformer. This avoids the installation difficulties and costs associated with direct monitoring on the high-voltage side, and improves the real-time performance, anti-interference capability, and accuracy of fault detection. Compared to traditional manual line inspection and high-voltage side sensor solutions, it has significant advantages in terms of cost, efficiency, and reliability. It effectively solves the problem of large-scale application of rapid detection of fuse failure in distribution networks. The specific implementation principle will be described in detail in the following embodiments.

[0022] This application provides a method for detecting fuse failure on the high-voltage side of a distribution transformer in its first aspect.

[0023] Please see Figure 1 This is a schematic diagram of a fuse failure detection method on the high-voltage side of a distribution transformer according to an embodiment of this application. The method includes: Step 110: Obtain the positive sequence component, negative sequence component, zero sequence component, positive sequence component, negative sequence component, and zero sequence component of the low-voltage current on the low-voltage side of the distribution transformer.

[0024] Regarding the acquisition methods of the positive-sequence component of low-voltage voltage, negative-sequence component of low-voltage voltage, zero-sequence component of low-voltage voltage, positive-sequence component of low-voltage current, negative-sequence component of low-voltage current, and zero-sequence component of low-voltage current, in some embodiments, the three-phase voltage and three-phase current on the low-voltage side of the distribution transformer can be collected in real time to determine the positive-sequence component of low-voltage voltage, negative-sequence component of low-voltage voltage, zero-sequence component of low-voltage voltage, positive-sequence component of low-voltage current, negative-sequence component of low-voltage current, and zero-sequence component of low-voltage current.

[0025] Step 120: When the voltage amplitude of the negative sequence component of the low voltage is greater than the negative sequence voltage initiation threshold, determine the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the positive sequence component of the low voltage, the negative sequence component of the low voltage, the zero sequence component of the low voltage, the positive sequence component of the low voltage current, the negative sequence component of the low voltage current, and the zero sequence component of the low voltage current.

[0026] The negative sequence voltage start-up threshold can be obtained and preset by the operator based on extensive experience, experiments, or statistics. Alternatively, it can be preset by the operator according to actual needs.

[0027] In some embodiments, the negative sequence voltage initiation threshold can be determined by obtaining the amplitude of the low-voltage rated phase voltage on the low-voltage side of the distribution transformer, and then determining the negative sequence voltage initiation threshold based on the amplitude of the low-voltage rated phase voltage.

[0028] Furthermore, in some embodiments, a first preset percentage of the low-voltage rated phase voltage amplitude can be used as the negative sequence voltage start-up threshold; wherein the first preset percentage can be obtained and preset by the operator based on a large amount of experience, experimentation or statistics, or of course, it can also be preset by the operator according to actual needs.

[0029] Regarding the value of the first preset percentage, in some embodiments, this application preferably sets the first preset percentage to any one of [10%, 50%].

[0030] It should be noted that in a distribution transformer, the relationship between the current on the high-voltage side and the voltage on the low-voltage side follows the law of conservation of energy and the principle of voltage-current transformation. Therefore, in some embodiments, this principle can be used to determine the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the positive-sequence component, negative-sequence component, zero-sequence component of the low-voltage voltage, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current.

[0031] Step 130: Determine the three-phase voltage amplitude based on the high-voltage three-phase voltage vector, and mark the phase with the lowest voltage amplitude as the amplitude characteristic phase, and mark the other two phases as phase characteristic phases.

[0032] In some embodiments, the voltage magnitude of the three-phase voltage can be determined based on the voltage vectors of the three phases in the high-voltage three-phase voltage vector, and the voltage magnitudes of the three phases can be used as the three-phase voltage amplitude.

[0033] Step 140: Based on the high-voltage three-phase voltage vector, determine the voltage phase of the two phase characteristic phases, and based on the voltage phase of the two phase characteristic phases, determine whether the amplitude characteristic phase has experienced fuse blowing.

[0034] In some embodiments, the radian of the two characteristic phases can be determined based on the voltage vectors of the two characteristic phases in the high-voltage three-phase voltage vector. Then, the radian of the two characteristic phases can be converted into angles, and the angles of the two characteristic phases can be used as the voltage phase of the two characteristic phases.

[0035] In some embodiments, the determination of whether a suspected fuse-fusing phase has blown is based on the voltage phase difference between the voltage phases of two characteristic phases.

[0036] In some embodiments, the status of a suspected fuse failure can be uploaded to the main station or edge terminal, and relevant data of the fuse failure event can be recorded.

[0037] In this embodiment, high-voltage side data is retrieved from low-voltage side data, avoiding the installation difficulties and costs associated with direct monitoring of the high-voltage side. At the same time, real-time data processing improves the real-time performance, anti-interference capability, and accuracy of fault detection. Compared with traditional manual line inspection and high-voltage side sensor solutions, it has significant advantages in terms of cost, efficiency, and reliability, effectively solving the problem of large-scale application of rapid detection of fuse failure in power distribution networks.

[0038] In addition to the aforementioned beneficial effects, the method and device for detecting fuse failure on the high-voltage side of the distribution transformer also have the following advantages: Optimized allocation of operation and maintenance resources: Traditional operation and maintenance relies on manual line patrols, which lacks targeted allocation of manpower. Personnel are often only dispatched for patrols after a fuse failure occurs, requiring a large workforce to cover the entire distribution network area. This application, through real-time monitoring and data uploading, allows operation and maintenance personnel to know the location of fuse failures in advance. The operation and maintenance department can rationally allocate operation and maintenance personnel and equipment resources based on the urgency and impact of the fuse failure, concentrating limited resources on handling critical faults, improving resource utilization efficiency, and reducing unnecessary resource waste; Facilitates fault statistics and analysis: This method can record relevant data on fuse failure events, such as the time and location of failure. Through long-term accumulation and analysis of this data, a deeper understanding of the occurrence patterns and distribution characteristics of fuse failures in the distribution network, as well as their relationship with power grid operating parameters and environmental factors, can be gained. This provides strong data support for power grid planning, design, and renovation, helping to optimize the power grid structure and improve the power grid's fault resistance. Capabilities; Reduced power outage duration: Rapid and accurate detection and timely handling of fuse failures significantly reduces the duration of power outages caused by fuse failures. For users, this translates to a more stable power supply, reducing inconvenience and losses caused by power outages to production and daily life, and improving user satisfaction and electricity experience; Ensuring reliable power supply for critical users: For critical users with extremely high requirements for power supply reliability, such as hospitals, data centers, and large factories, this method can promptly detect and handle fuse failures, ensuring minimal power supply interruptions, guaranteeing the normal operation of their critical equipment, and avoiding significant economic losses and social impacts caused by power outages; Adapting to the trend of smart grid development: With the continuous construction and development of smart grids, the requirements for monitoring and protecting grid equipment are becoming increasingly stringent, necessitating more intelligent and automated detection methods. This method utilizes low-voltage side data to invert high-voltage side data, achieving intelligent and automated fuse failure detection, which aligns with the trend of smart grid development and helps improve the overall intelligence level of the power grid.

[0039] In one feasible implementation, step 140 in the above embodiment, determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phases of the two phase characteristic phases, includes: determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phases of the two phase characteristic phases and the voltage amplitude of the amplitude characteristic phase.

[0040] In some embodiments, the determination of whether a suspected fuse-blown phase has blown is based on the voltage phase difference between the voltage phases of two characteristic phases and the voltage amplitude of the amplitude characteristic phase.

[0041] In this embodiment, by introducing the voltage amplitude of the amplitude characteristic phase and combining the voltage phase of the two phase characteristic phases with the voltage amplitude of the amplitude characteristic phase for comprehensive judgment, the accuracy and reliability of fuse failure detection can be further improved, and the comprehensiveness of fuse failure judgment can be enhanced.

[0042] Understandably, when determining whether a fuse has blown in the amplitude characteristic phase, a comprehensive judgment is made not only based on the voltage phases of the two phase characteristic phases but also on the voltage amplitude of the amplitude characteristic phase. Compared to relying solely on voltage phase, this method, which combines voltage phase and amplitude, can more comprehensively consider changes in multiple parameters, avoiding misjudgments due to interference from a single parameter or special circumstances. This improves the accuracy of the detection results, makes fuse fault diagnosis more reliable, and provides a more precise basis for subsequent operation and maintenance.

[0043] In one feasible implementation, determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phase of the two phase characteristic phases and the voltage amplitude of the amplitude characteristic phase in the above embodiments includes: determining the absolute value of the voltage phase difference between the voltage phases of the two phase characteristic phases; and determining whether a fuse has blown in the amplitude characteristic phase based on the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold.

[0044] The voltage phase characteristic threshold and voltage amplitude characteristic threshold can both be obtained and preset by the operator based on a large amount of experience, experiments or statistics. Of course, they can also be preset by the operator according to actual needs.

[0045] Regarding the value of the voltage phase characteristic threshold, in some embodiments, this application preferably sets the current phase characteristic threshold to any angle in [150°, 170°].

[0046] In some embodiments, the voltage amplitude characteristic threshold can be determined by obtaining the voltage rated phase voltage amplitude on the high-voltage side of the distribution transformer and then determining the voltage amplitude characteristic threshold based on the voltage rated phase voltage amplitude.

[0047] Furthermore, in some embodiments, a second preset percentage of the high-voltage rated phase voltage amplitude can be used as the voltage amplitude characteristic threshold; wherein the second preset percentage can be obtained and preset by the operator based on a large amount of experience, experiment or statistics, or of course, it can also be preset by the operator according to actual needs.

[0048] Regarding the value of the second preset percentage, in some embodiments, this application preferably sets the second preset percentage to any one of [1%, 30%].

[0049] In this embodiment of the application, by determining the absolute value of the voltage phase difference between the voltage phases of two phase characteristic phases, and combining the absolute value of the voltage phase difference with a preset voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase with a preset voltage amplitude characteristic threshold, a comprehensive judgment is made, which further improves the accuracy and reliability of fuse failure judgment.

[0050] Understandably, improving judgment accuracy involves determining the absolute value of the voltage phase difference between two characteristic phases, combining this absolute value with a preset voltage phase characteristic threshold, and considering the voltage amplitude of the amplitude characteristic phase with a preset voltage amplitude characteristic threshold. Compared to simply relying on the phase difference, or the phase difference and amplitude alone, this quantitative approach, combined with specific thresholds, can more accurately determine whether a suspected fuse-blown phase has actually blown. This is because the phase difference and amplitude vary within a certain range under different operating conditions, both normal and fault states. Setting reasonable thresholds can prevent the possibility of a fuse blowing due to accidental factors or normal operating conditions. This reduces misjudgments caused by fluctuations, thereby improving the accuracy of fuse fault diagnosis; it also enhances reliability: the voltage phase characteristic threshold and voltage amplitude characteristic threshold can be set by operators based on extensive experience, experiments, or statistics, and can also be adjusted according to actual needs. This flexible approach, based on actual data and experience, makes the thresholds more closely match actual operating conditions and can adapt to different distribution network environments and the characteristics of distribution transformers. Whether in distribution networks of different regions and load levels, or when dealing with distribution transformers of different specifications and service lives, reasonable threshold settings can reliably determine fuse faults, thus enhancing the reliability of the entire detection method.

[0051] In one feasible implementation, determining whether a fuse has blown in the amplitude characteristic phase based on the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, in the above embodiments includes: determining that a fuse has blown in the amplitude characteristic phase when the absolute value of the voltage phase difference is greater than the voltage phase characteristic threshold and the voltage amplitude of the amplitude characteristic phase is less than the voltage amplitude characteristic threshold; and determining that a fuse has not blown in the amplitude characteristic phase when the absolute value of the voltage phase difference is less than or equal to the voltage phase characteristic threshold and / or the voltage amplitude of the amplitude characteristic phase is greater than or equal to the voltage amplitude characteristic threshold.

[0052] In this embodiment of the application, by clearly setting the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the relationship between the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, as a comprehensive judgment basis, the accuracy and clarity of fuse failure judgment are further improved, and the occurrence of misjudgment and omission is effectively avoided.

[0053] Understandably, improving the accuracy of judgment is achieved by clearly defining the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the relationship between the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, as a comprehensive judgment basis. Compared with vague judgment methods, this clear standard can more accurately define whether the suspected fuse phase has actually blown. Under different operating conditions, the phase difference and amplitude in normal and fault states have a certain range. This method, based on clear thresholds, can avoid misjudgments caused by accidental factors or normal fluctuations, greatly improving the accuracy of fuse fault judgment. Enhancing the clarity of judgment is also achieved by clearly classifying multiple situations and correspondingly determining whether the suspected fuse phase has blown. This clear judgment logic enables maintenance personnel to quickly and accurately grasp the fuse fault situation, avoiding processing delays or incorrect operations caused by unclear judgments, and enhancing the clarity of the entire fuse fault judgment process.

[0054] In one feasible implementation, step 120 in the above embodiment, which determines the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current, includes: obtaining the voltage transformation ratio of the high-voltage side to the low-voltage side of the distribution transformer, and the lead angle of the high-voltage side leading the low-voltage side; and determining the high-voltage three-phase voltage vector based on the voltage transformation ratio, the lead angle, the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current.

[0055] In this embodiment, the voltage ratio between the high-voltage side and the low-voltage side of the distribution transformer and the lead angle of the high-voltage side over the low-voltage side are obtained. The high-voltage three-phase voltage vector is determined by comprehensively considering the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current. This improves the accuracy and applicability of the high-voltage three-phase voltage vector determination and ensures the reliability of subsequent fuse fault judgment.

[0056] Understandably, by obtaining the voltage transformation ratio of the high-voltage side to the low-voltage side of the distribution transformer and the lead angle of the high-voltage side over the low-voltage side, and by comprehensively considering the positive-sequence component, negative-sequence component, zero-sequence component of the low-voltage voltage, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current, the high-voltage three-phase voltage vector is determined. This method comprehensively considers the key factors affecting the determination of the inverted high-voltage three-phase voltage vector. Different distribution transformers have different voltage transformation ratios and lead angles. Accurately obtaining these parameters and incorporating them into the calculation can more accurately reflect the actual situation of the high-voltage three-phase voltage vector on the high-voltage side, avoiding calculation errors caused by ignoring these factors, thereby improving the accuracy of the determination of the high-voltage three-phase voltage vector.

[0057] Furthermore, this method is applicable to distribution transformers of various specifications and operating conditions. Regardless of changes in voltage ratio and lead angle, it can accurately calculate based on the obtained parameters, enhancing the applicability of the method in different scenarios. The accuracy and applicability of the high-voltage three-phase voltage vector determination provide a reliable basis for subsequent fuse fault judgment based on the high-voltage three-phase voltage vector, ensuring the reliability of the entire fuse fault detection process.

[0058] In one feasible implementation, determining the high-voltage three-phase voltage vector based on the voltage transformation ratio, lead angle, positive-sequence component of low-voltage voltage, negative-sequence component of low-voltage voltage, zero-sequence component of low-voltage voltage, positive-sequence component of low-voltage current, negative-sequence component of low-voltage current, and zero-sequence component of low-voltage current in the above embodiments includes: obtaining a calculation model for low-voltage voltage inversion of high-voltage voltage from a distribution transformer; and using the calculation model for low-voltage voltage inversion of high-voltage voltage to determine the high-voltage three-phase voltage vector based on the voltage transformation ratio, lead angle, positive-sequence component of low-voltage voltage, negative-sequence component of low-voltage voltage, zero-sequence component of low-voltage voltage, positive-sequence component of low-voltage current, negative-sequence component of low-voltage current, and zero-sequence component of low-voltage current.

[0059] Among them, the calculation model for low-voltage voltage inversion to high-voltage voltage can be obtained and preset by the operator based on a large amount of experience, experiments or statistics.

[0060] In this embodiment, a calculation model for high-voltage inversion from low-voltage voltage is obtained, and this model is used in conjunction with voltage ratio, lead angle, positive-sequence component of low-voltage voltage, negative-sequence component of low-voltage voltage, zero-sequence component of low-voltage voltage, positive-sequence component of low-voltage current, negative-sequence component of low-voltage current, and zero-sequence component of low-voltage current to determine the high-voltage three-phase voltage vector. This improves the accuracy and scientific validity of the high-voltage three-phase voltage vector determination and ensures the reliability of subsequent fuse fault judgment.

[0061] Understandably, by obtaining a calculation model for high-voltage inversion from low-voltage voltage, and using this model in conjunction with voltage ratio, lead angle, positive-sequence component, negative-sequence component, zero-sequence component of low-voltage voltage, positive-sequence component, negative-sequence component, and zero-sequence component of low-voltage current, the high-voltage three-phase voltage vector is determined. This method utilizes a calculation model that has been verified through extensive experience, experiments, or statistical analysis. It can more scientifically and accurately reflect the actual situation of the high-voltage three-phase voltage vector on the high-voltage side, avoiding errors that may arise from relying solely on theoretical derivation or simple calculations. This improves the accuracy of determining the high-voltage three-phase voltage vector. At the same time, the accurately determined high-voltage three-phase voltage vector provides a reliable basis for subsequent fuse fault judgment based on this high-voltage three-phase voltage vector, ensuring the reliability of the entire fuse fault detection process.

[0062] In one feasible implementation, the calculation model for low-voltage inversion of high-voltage in the above embodiments is as follows: ; in, , and These represent the A-phase voltage vector, B-phase voltage vector, and C-phase voltage vector in the high-voltage three-phase voltage vector system. For voltage turns ratio, It is the three-phase rotation factor. It is the orthogonal rotation factor. This is the positive sequence component of the low-voltage system. It is a negative rotation factor. This is the negative sequence component of the low-voltage system. The zero-sequence component of the low-voltage voltage. This is the zero-sequence component of the low-voltage current. This is the positive sequence component of the low-voltage current. This is the negative sequence component of the low-voltage current. For natural numbers, The imaginary unit, This is the forward angle.

[0063] In this embodiment, the calculation model for high-voltage voltage inversion using low-voltage voltage comprehensively considers key factors such as voltage ratio, lead angle, positive sequence component of low-voltage voltage, negative sequence component of low-voltage voltage, zero sequence component of low-voltage voltage, positive sequence component of low-voltage current, negative sequence component of low-voltage current, and zero sequence component of low-voltage current. This improves the accuracy and scientific nature of determining the high-voltage three-phase voltage vector and provides a reliable basis for subsequent fuse fault judgment.

[0064] Understandably, this low-voltage voltage inversion high-voltage calculation model comprehensively considers key factors such as voltage turns ratio, lead angle, positive-sequence component of low-voltage voltage, negative-sequence component of low-voltage voltage, zero-sequence component of low-voltage voltage, positive-sequence component of low-voltage current, negative-sequence component of low-voltage current, and zero-sequence component of low-voltage current. Among these, voltage turns ratio and lead angle reflect the differences in electrical characteristics between the high-voltage and low-voltage sides of the distribution transformer. Different distribution transformers have different parameters; accurately obtaining and incorporating these parameters into the model calculation can more precisely reflect the actual situation of the high-voltage three-phase voltage vector on the high-voltage side. The three-phase rotation factor, positive-sequence rotation factor, and negative-sequence rotation factor are also considered. The conversion factor helps to scientifically process the positive-sequence component, negative-sequence component, and zero-sequence component of low-voltage voltage, as well as the positive-sequence component, negative-sequence component, and zero-sequence component of low-voltage current. Calculations are performed using this low-voltage inversion high-voltage calculation model, which has been verified through extensive experience, experiments, and statistical methods. This avoids errors that may arise from relying solely on theoretical derivation or simple calculations, improving the accuracy of determining the high-voltage three-phase voltage vector. This provides a reliable basis for subsequent fuse fault judgment based on this high-voltage three-phase voltage vector, ensuring the reliability of the entire fuse fault detection process.

[0065] In one feasible implementation, the method in the above embodiments further includes: determining that no fuse has blown when the voltage amplitude of the negative sequence component of the low voltage is less than or equal to the negative sequence voltage activation threshold.

[0066] In this embodiment, when the voltage amplitude of the negative sequence component of the low voltage is less than or equal to the negative sequence voltage activation threshold, it is directly determined that the fuse has not blown, which improves the accuracy and efficiency of fuse blow detection and avoids unnecessary judgment procedures.

[0067] Understandably, if the voltage amplitude of the negative sequence component of the low-voltage system is less than or equal to the negative sequence voltage trigger threshold, it can be directly determined that the fuse has not blown. This approach avoids performing operations when no further complex judgment procedures are needed, reducing unnecessary calculation and judgment steps and making the entire detection process more efficient. At the same time, since the negative sequence voltage trigger threshold is set based on a large amount of experience, experiments, or statistics, using it as a judgment criterion can accurately distinguish whether further detection of fuse blowing is needed, improving the accuracy of fuse blowing detection and preventing unnecessary maintenance operations caused by misjudgment or the problem of untimely handling of fuse blowing faults caused by missed judgment.

[0068] In one feasible implementation, obtaining the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage side of the distribution transformer in the above embodiments includes: obtaining the low-voltage three-phase voltage vector and the low-voltage three-phase current vector on the low-voltage side of the distribution transformer; determining the positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage voltage based on the low-voltage three-phase voltage vector; and determining the positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current based on the low-voltage three-phase current vector.

[0069] In some embodiments, the determination of the low-voltage three-phase voltage vector and the low-voltage three-phase current vector can be achieved by synchronously acquiring the low-voltage three-phase simulated voltage and current on the low-voltage side of the distribution transformer in real time. Then, both the low-voltage three-phase simulated voltage and current are preprocessed to obtain standard low-voltage three-phase simulated voltage and current. Next, both standard low-voltage three-phase simulated voltage and current are subjected to analog-to-digital conversion to obtain low-voltage three-phase digital voltage and current. Then, both low-voltage three-phase digital voltage and current are subjected to anti-aliasing processing to obtain standard low-voltage three-phase digital voltage and current. Finally, the low-voltage three-phase voltage vector and the low-voltage three-phase current vector are determined based on the standard low-voltage three-phase digital voltage and current.

[0070] In some embodiments, the low-voltage three-phase simulated voltage and low-voltage three-phase simulated current can be acquired in real time using hardware devices; the hardware devices can be voltage transformers and current transformers, etc.

[0071] In some embodiments, preprocessing includes, but is not limited to, transformation, filtering, and other processing.

[0072] For analog-to-digital conversion processing, in some embodiments, a multi-channel synchronous sampling ADC (i.e., analog-to-digital converter) can be used to perform analog-to-digital conversion on both the standard low-voltage three-phase analog voltage and the standard low-voltage three-phase analog current to obtain the low-voltage three-phase digital voltage and low-voltage three-phase digital current.

[0073] For anti-aliasing processing, in some embodiments, a low-pass filter can be used to perform anti-aliasing processing on both the low-voltage three-phase digital voltage and the low-voltage three-phase digital current to obtain standard low-voltage three-phase digital voltage and standard low-voltage three-phase digital current.

[0074] In some embodiments, the low-voltage three-phase voltage vector and low-voltage three-phase current vector can be determined by any of the following methods: synchronous DFT (Discrete Fourier Transform) with a window length of an integer or half-cycle, vector tracking based on PLL (Phase-Locked Loop), or steady-state vector estimation based on least squares, based on the standard low-voltage three-phase digital voltage and standard low-voltage three-phase digital current.

[0075] Regarding the determination of the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of low-voltage voltage, in some embodiments, the symmetrical component method can be used to determine the positive-sequence component, negative-sequence component, and zero-sequence component of low-voltage voltage based on the three-phase low-voltage voltage vector, and to determine the positive-sequence component, negative-sequence component, and zero-sequence component of low-voltage current based on the three-phase low-voltage current vector.

[0076] In this embodiment, the low-voltage three-phase voltage vector and low-voltage three-phase current vector of the distribution transformer are obtained. Multiple processing steps are used to ensure data accuracy, which improves the accuracy and comprehensiveness of low-voltage side data acquisition and provides a reliable foundation for subsequent fuse failure detection.

[0077] Understandably, obtaining the low-voltage three-phase voltage and current vectors from the low-voltage side of the distribution transformer involves multiple processing steps to ensure data accuracy. These steps include real-time acquisition of the low-voltage three-phase analog voltage and current, followed by preprocessing to eliminate interference, analog-to-digital conversion to convert analog signals into digital signals for easier subsequent calculation and analysis, multi-channel synchronous sampling ADC to ensure sampling synchronization and accuracy, anti-aliasing processing to prevent signal aliasing and ensure that the digital signal accurately reflects the characteristics of the original analog signal, and finally, using multiple methods to determine the low-voltage three-phase voltage and current vectors, which can be flexibly selected according to actual conditions to ensure the accuracy of the determined low-voltage three-phase voltage and current vectors.

[0078] Furthermore, the symmetrical component method is used to determine the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage voltage, as well as the low-voltage current. This provides a reliable basis for subsequent fuse failure detection based on these components, ensuring the accuracy of the entire detection process.

[0079] To verify the effectiveness of the fuse failure detection method on the high-voltage side of the distribution transformer proposed in this application, a complete test process for fuse failure on the high-voltage side of a Dyn11 type distribution transformer was conducted.

[0080] The low-voltage three-phase voltage vector and low-voltage three-phase current vector of the distribution transformer are obtained as follows: The voltage vector of phase A in the low-voltage three-phase voltage vector is 0.074719496693513-j0.0532788566379851kV; The voltage vector of phase B in the low-voltage three-phase voltage vector is -0.193552253852793 + j0.117613993791074 kV; The C-phase voltage vector in the low-voltage three-phase voltage vector is 0.11821405064424-j0.0647803231785601kV; The A-phase current vector in the low-voltage three-phase current vector is 0.0456459425430004-j0.0504790998742293kA; The B-phase current vector in the low-voltage three-phase current vector is 0.0060895096757346-j0.00446651756109604kA; The C-phase current vector in the low-voltage three-phase current vector is 0.0060895096757346-j0.00446651756109604kA.

[0081] The calculated positive-sequence component of the low-voltage voltage is -0.015189837901275 - j0.116564410560889 kV, the negative-sequence component is 0.0901155700998016 + j0.0634339492647276 kV, and the zero-sequence component is -0.0002062355050136 - j0.00014839534182371 kV. At 2kV, the positive sequence component of the low-voltage current is -0.0195501419419503-j0.057377902447395kA, the negative sequence component is 0.0591065748092161+j0.0113653201342617kA, and the zero sequence component is 0.0060895096757346-j0.00446651756109604kA.

[0082] The calculated amplitude of the negative sequence component of the low-voltage voltage is 0.11kV. The negative sequence voltage initiation threshold is taken as 20% of the amplitude of the rated low-voltage phase voltage on the low-voltage side of the distribution transformer, i.e., (0.4kV × 20%) / =0.046kV, 0.11kV is greater than 0.046kV.

[0083] The voltage transformation ratio from the high-voltage side to the low-voltage side of the Dyn11 type distribution transformer is 25. The high-voltage three-phase voltage vector obtained by using the low-voltage inversion high-voltage calculation model is as follows: The voltage vector of phase A in the high-voltage three-phase voltage vector is -0.62740387659392 + j0.16578245787784 kV; The voltage vector of phase A in the high-voltage three-phase voltage vector is -3.95335373031865 + j2.43230891043906 kV; The voltage vector of phase A in the high-voltage three-phase voltage vector is 4.58075760691257-j2.5980913683169kV.

[0084] The calculated three-phase voltage amplitudes are 0.65kV for phase A, 4.64kV for phase B, and 5.26kV for phase C. Phase A is marked as the amplitude characteristic phase, and both phases B and C are marked as phase characteristic phases.

[0085] The calculated absolute value of the voltage phase difference between the two characteristic phases is 178°. The voltage phase characteristic threshold is taken as 160°, and the voltage amplitude characteristic threshold is taken as 20% of the rated voltage amplitude of the high-voltage phase on the high-voltage side of the distribution transformer, i.e., (10kV × 20%) / =1.15kV, 178° is greater than 160°, and 0.65kV is less than 1.15kV, indicating that the suspected fuse phase has blown.

[0086] Through the above tests, this application fully verifies the effectiveness of the method proposed in this application for the fuse failure detection process on the high-voltage side of the Dyn11 type distribution transformer.

[0087] In a second aspect, this application provides a fuse failure detection device for the high-voltage side of a distribution transformer.

[0088] Please see Figure 2 This is a schematic diagram of a fuse failure detection device on the high-voltage side of a distribution transformer according to an embodiment of this application. The device 210 includes: The acquisition module 211 is used to acquire the positive sequence component of low voltage, the negative sequence component of low voltage, the zero sequence component of low voltage, the positive sequence component of low voltage current, the negative sequence component of low voltage current, and the zero sequence component of low voltage current on the low voltage side of the distribution transformer. The judgment and determination module 212 is used to determine the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the low-voltage positive-sequence component, low-voltage negative-sequence component, low-voltage zero-sequence component, low-voltage positive-sequence component, low-voltage negative-sequence component, and low-voltage zero-sequence component when the voltage amplitude of the low-voltage negative-sequence component is greater than the negative-sequence voltage initiation threshold. The determination and marking module 213 is used to determine the three-phase voltage amplitude based on the high-voltage three-phase voltage vector, mark the phase with the lowest voltage amplitude as the amplitude characteristic phase, and mark the other two phases as phase characteristic phases; The determination module 214 is used to determine the voltage phase of two phase characteristic phases based on the high-voltage three-phase voltage vector, and to determine whether the amplitude characteristic phase has experienced fuse blowing based on the voltage phase of the two phase characteristic phases.

[0089] In this embodiment of the application, the relevant contents of the above-mentioned acquisition module 211, judgment and determination module 212, determination and marking module 213 and determination module 214 can be found in the following references. Figure 1 The contents of the illustrated embodiments will not be repeated here.

[0090] It should be noted that the device 210 of this application also includes other modules. It can be understood that the method of this application and the device 210 have a one-to-one correspondence. Therefore, the other modules of the device 210 of this application are the contents corresponding to the method of this application in the above embodiments.

[0091] In this embodiment, high-voltage side data is retrieved from low-voltage side data, avoiding the installation difficulties and costs associated with direct monitoring of the high-voltage side. At the same time, real-time data processing improves the real-time performance, anti-interference capability, and accuracy of fault detection. Compared with traditional manual line inspection and high-voltage side sensor solutions, it has significant advantages in terms of cost, efficiency, and reliability, effectively solving the problem of large-scale application of rapid detection of fuse failure in power distribution networks.

[0092] In addition to the aforementioned beneficial effects, the fuse failure detection device and apparatus on the high-voltage side of the distribution transformer also have the following advantages: Optimized allocation of operation and maintenance resources: Traditional operation and maintenance relies on manual line patrols, which lacks targeted allocation of manpower. Personnel are often only dispatched for patrols after a fuse failure occurs, requiring a large workforce to cover the entire distribution network area. This application, through real-time monitoring and data uploading, allows operation and maintenance personnel to know the location of fuse failures in advance. The operation and maintenance department can rationally allocate operation and maintenance personnel and equipment resources based on the urgency and impact of the fuse failure, concentrating limited resources on handling critical faults, improving resource utilization efficiency, and reducing unnecessary resource waste; Facilitates fault statistics and analysis: This device can record relevant data on fuse failure events, such as the time and location of failure. Through long-term accumulation and analysis of this data, a deeper understanding of the occurrence patterns and distribution characteristics of fuse failures in the distribution network, as well as their relationship with power grid operating parameters and environmental factors, can be gained. This provides strong data support for power grid planning, design, and renovation, helping to optimize the power grid structure and improve the power grid's fault resistance. Capabilities; Reduced power outage duration: Rapid and accurate detection and timely handling of fuse failures significantly reduces power outage duration caused by fuse failures. For users, this translates to a more stable power supply, reducing inconvenience and losses caused by power outages, and improving user satisfaction and electricity experience. Ensuring reliable power supply for critical users: For critical users with extremely high power supply reliability requirements, such as hospitals, data centers, and large factories, this device can promptly detect and handle fuse failures, ensuring minimal power outage time, guaranteeing the normal operation of their critical equipment, and avoiding significant economic losses and social impacts caused by power outages. Adapting to the trend of smart grid development: With the continuous construction and development of smart grids, the requirements for monitoring and protecting grid equipment are increasing, necessitating more intelligent and automated detection devices. This device utilizes low-voltage side data to invert high-voltage side data, achieving intelligent and automated fuse failure detection, which aligns with the trend of smart grid development and helps improve the overall intelligence level of the power grid.

[0093] In a third aspect, this application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform a fuse-breaking detection method on the high-voltage side of a distribution transformer as described in any of the first aspects.

[0094] This application provides a computer device in a fourth aspect, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform a fuse-breaking detection method on the high-voltage side of a distribution transformer as described in any of the first aspects.

[0095] Figure 3The diagram illustrates the internal structure of a computer device in some embodiments. This computer device may specifically be a terminal, a server, or a gateway. Figure 3 As shown, the computer device includes a processor, memory, and network interface connected via a system bus.

[0096] The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When executed by a processor, this computer program causes the processor to perform the steps in the above method embodiments. The internal memory may also store a computer program, which, when executed by a processor, causes the processor to perform the steps in the above method embodiments. Those skilled in the art will understand that... Figure 3 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0097] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods.

[0098] Any references to memory, storage, database, or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A method for detecting fuse failure on the high-voltage side of a distribution transformer, characterized in that, The method includes: Obtain the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current on the low-voltage side of the distribution transformer. When the voltage amplitude of the negative sequence component of the low voltage is greater than the negative sequence voltage initiation threshold, the high-voltage three-phase voltage vector of the high-voltage side of the distribution transformer is determined based on the positive sequence component of the low voltage, the negative sequence component of the low voltage, the zero sequence component of the low voltage, the positive sequence component of the low voltage current, the negative sequence component of the low voltage current, and the zero sequence component of the low voltage current. Based on the high-voltage three-phase voltage vector, the three-phase voltage amplitude is determined, and the phase with the lowest voltage amplitude is marked as the amplitude characteristic phase, and the other two phases are marked as phase characteristic phases; Based on the high-voltage three-phase voltage vector, the voltage phases of the two phase characteristic phases are determined, and based on the voltage phases of the two phase characteristic phases, it is determined whether the amplitude characteristic phase has experienced fuse failure.

2. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 1, characterized in that, The step of determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phases of the two phase characteristic phases includes: Based on the voltage phase of the two phase characteristic phases and the voltage amplitude of the amplitude characteristic phase, it is determined whether the fuse of the amplitude characteristic phase has blown.

3. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 2, characterized in that, The step of determining whether a fuse has blown in the amplitude characteristic phase based on the voltage phases of the two phase characteristic phases and the voltage amplitude of the amplitude characteristic phase includes: Determine the absolute value of the voltage phase difference between the voltage phases of two characteristic phases; Based on the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, it is determined whether the fuse of the amplitude characteristic phase has blown.

4. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 3, characterized in that, The step of determining whether a fuse has blown in the amplitude characteristic phase based on the absolute value of the voltage phase difference and the voltage phase characteristic threshold, as well as the voltage amplitude of the amplitude characteristic phase and the voltage amplitude characteristic threshold, includes: If the absolute value of the voltage phase difference is greater than the voltage phase characteristic threshold, and the voltage amplitude of the amplitude characteristic phase is less than the voltage amplitude characteristic threshold, it is determined that the fuse of the amplitude characteristic phase has blown. If the absolute value of the voltage phase difference is less than or equal to the voltage phase characteristic threshold, and / or the voltage amplitude of the amplitude characteristic phase is greater than or equal to the voltage amplitude characteristic threshold, it is determined that the fuse in the amplitude characteristic phase has not blown.

5. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 1, characterized in that, The step of determining the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current includes: Obtain the voltage transformation ratio from the high-voltage side to the low-voltage side of the distribution transformer, and the lead angle of the high-voltage side over the low-voltage side; The high-voltage three-phase voltage vector is determined based on the voltage transformation ratio, the lead angle, the positive sequence component of the low-voltage voltage, the negative sequence component of the low-voltage voltage, the zero sequence component of the low-voltage voltage, the positive sequence component of the low-voltage current, the negative sequence component of the low-voltage current, and the zero sequence component of the low-voltage current.

6. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 5, characterized in that, The step of determining the high-voltage three-phase voltage vector based on the voltage transformation ratio, the lead angle, the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current includes: Obtain the calculation model for low-voltage inversion of high-voltage from the distribution transformer; Using the low-voltage inversion high-voltage calculation model, the high-voltage three-phase voltage vector is determined based on the voltage ratio, the lead angle, the positive-sequence component of the low-voltage voltage, the negative-sequence component of the low-voltage voltage, the zero-sequence component of the low-voltage voltage, the positive-sequence component of the low-voltage current, the negative-sequence component of the low-voltage current, and the zero-sequence component of the low-voltage current.

7. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 6, characterized in that, The calculation model for low-voltage voltage inversion to high-voltage voltage is as follows: ； in, , and These refer to the A-phase voltage vector, B-phase voltage vector, and C-phase voltage vector in the aforementioned high-voltage three-phase voltage vector. The voltage transformation ratio is mentioned above. It is the three-phase rotation factor. It is the orthogonal rotation factor. The low-voltage positive-sequence component is... It is a negative rotation factor. This refers to the negative sequence component of the low-voltage voltage. The low-voltage zero-sequence component, This refers to the zero-sequence component of the low-voltage current. This refers to the positive sequence component of the low-voltage current. This refers to the negative sequence component of the low-voltage current. For natural numbers, The imaginary unit, The aforementioned leading angle.

8. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 1, characterized in that, The method further includes: If the voltage amplitude of the negative sequence component of the low voltage is less than or equal to the negative sequence voltage activation threshold, it is determined that no fuse has blown.

9. The method for detecting fuse failure on the high-voltage side of a distribution transformer according to claim 1, characterized in that, The acquisition of the positive-sequence component, negative-sequence component, zero-sequence component, positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current on the low-voltage side of the distribution transformer includes: Obtain the low-voltage three-phase voltage vector and low-voltage three-phase current vector of the low-voltage side of the distribution transformer; Based on the low-voltage three-phase voltage vector, determine the positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage voltage; Based on the low-voltage three-phase current vector, the positive-sequence component, negative-sequence component, and zero-sequence component of the low-voltage current are determined.

10. A fuse failure detection device on the high-voltage side of a distribution transformer, characterized in that, The device includes: The acquisition module is used to acquire the positive sequence component, negative sequence component, zero sequence component, positive sequence component, negative sequence component, and zero sequence component of the low-voltage current on the low-voltage side of the distribution transformer. The judgment and determination module is used to determine the high-voltage three-phase voltage vector on the high-voltage side of the distribution transformer based on the low-voltage positive-sequence component, the low-voltage negative-sequence component, the low-voltage zero-sequence component, the low-voltage positive-sequence component, the low-voltage negative-sequence component, and the low-voltage zero-sequence component when the voltage amplitude of the low-voltage negative-sequence component is greater than the negative-sequence voltage initiation threshold. The determination and marking module is used to determine the three-phase voltage amplitude based on the high-voltage three-phase voltage vector, mark the phase with the lowest voltage amplitude as the amplitude characteristic phase, and mark the other two phases as phase characteristic phases; The determination module is used to determine the voltage phase of two phase characteristic phases based on the high-voltage three-phase voltage vector, and to determine whether the amplitude characteristic phase has experienced fuse blowing based on the voltage phase of the two phase characteristic phases.

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