Dry-type reactor fault detection method and system based on swept impedance phase angle

Abstract

The application provides a dry-type electric reactor fault detection method and system based on a swept impedance phase angle, which comprises the following steps: obtaining impedance phase angle data of a dry-type electric reactor to be detected; obtaining an impedance phase angle frequency characteristic curve of the dry-type electric reactor to be detected based on the impedance phase angle data, dividing the frequency characteristic curve according to a frequency range, and obtaining a frequency band frequency characteristic curve; obtaining impedance phase angles of each frequency band of the dry-type electric reactor to be detected according to the frequency band frequency characteristic curves; obtaining standard impedance phase angle parameters of each frequency band of a standard dry-type electric reactor, obtaining impedance phase angle change rates of each frequency band based on the impedance phase angles of each frequency band and the standard impedance phase angles of each frequency band, and determining a fault degree of the dry-type electric reactor to be detected according to the impedance phase angle change rates of each frequency band. The dry-type electric reactor fault detection method based on the swept impedance phase angle can effectively improve the accuracy of the turn-to-turn short-circuit fault detection of the dry-type electric reactor.

Description

Technical Field

[0001] This invention relates to the field of inter-turn short-circuit fault detection technology for dry-type reactors, and specifically to a method and system for detecting faults in dry-type reactors based on swept-frequency impedance phase angle. Background Technology

[0002] To meet the ever-increasing demand for electricity, the power system is continuously expanding, leading to an increase in capacitive reactive power and severe harmonic pollution. Reactors, with their characteristics of reactive power compensation, harmonic pollution filtering, and limiting short-circuit current and system overvoltage, are widely used in power grids to address these problems. Dry-type reactors, in particular, have advantages such as simple and lightweight structure, relatively low price, convenient installation and maintenance, good inductance linearity, and high mechanical strength; they account for over 90% of all reactors of 66kV and below. However, the increasing capacity of dry-type reactors has led to a continuous increase in the number of encapsulated and parallel branches, making them highly susceptible to insulation defects during manufacturing and transportation. With the increase in nonlinear loads, the number of reactors in operation, and the length of service life, inter-turn short-circuit faults have gradually increased the proportion of accidents caused by dry-type air-core reactor failures in recent years. If a single-turn inter-turn short circuit cannot be effectively detected, it can develop into a multi-turn short circuit, causing the reactor to burn out, leading to a fire, endangering the normal operation of the power system, and causing huge losses.

[0003] Therefore, timely detection of inter-turn short-circuit faults in windings is of great practical significance for the inspection and maintenance of dry-type reactors. Currently, the main methods for detecting inter-turn short-circuit faults in power systems include the detection coil method and temperature monitoring method. However, the detection coil method has shortcomings such as low detection sensitivity, detection blind spots, and the possibility that the detection coil may affect the normal operation of the reactor. Temperature monitoring, on the other hand, has shortcomings such as detection accuracy being limited by the safe detection distance for live dry-type reactors and the ability to detect only the outer layer of the casing.

[0004] In summary, existing technologies for detecting inter-turn short-circuit faults in dry-type reactors have low detection accuracy and are not comprehensive enough. Summary of the Invention

[0005] In view of this, it is necessary to provide a method and system for detecting faults in dry-type reactors based on swept frequency impedance phase angle, so as to solve the technical problems of low detection accuracy and insufficient fault detection when detecting inter-turn short circuit faults in dry-type reactors in the prior art.

[0006] To address the aforementioned technical problems, this invention provides, on the one hand, a method for fault detection of dry-type reactors based on swept-frequency impedance phase angle, comprising:

[0007] Obtain the impedance phase angle data of the dry-type reactor under test;

[0008] Based on the impedance phase angle data, the impedance phase angle frequency characteristic curve of the dry reactor under test is obtained, and the frequency characteristic curve is divided according to the frequency range to obtain the frequency characteristic curve of each frequency band.

[0009] The impedance phase angle of the dry reactor under test in each frequency band is obtained based on the frequency characteristic curves of each frequency band.

[0010] Obtain the standard impedance phase angle parameters of each frequency band of the standard dry-type reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry-type reactor under test based on the impedance phase angle change rate of each frequency band.

[0011] In some possible implementations, the impedance phase angle data includes: the impedance phase angle and the frequency corresponding to the impedance phase angle.

[0012] In some possible implementations, the step of obtaining the impedance phase angle frequency characteristic curve of the dry-type reactor under test based on the impedance phase angle data, and dividing the frequency characteristic curve according to the frequency range to obtain the frequency characteristic curve of each frequency band, includes:

[0013] Plot the impedance phase angle frequency characteristic curve in a Cartesian coordinate system based on the impedance phase angle and the frequency corresponding to the impedance phase angle.

[0014] Based on the frequency range of the impedance phase angle frequency characteristic curve, the impedance phase angle frequency characteristic curve is divided into low-frequency band frequency characteristic curve, mid-frequency band frequency characteristic curve and high-frequency band frequency characteristic curve.

[0015] In some possible implementations, obtaining the characteristic impedance phase angle of the dry-type reactor under test for each frequency band based on the frequency characteristic curves of each frequency band includes:

[0016] Based on the characteristic frequency points of the low-frequency band frequency characteristic curve, the mid-frequency band frequency characteristic curve, and the high-frequency band frequency characteristic curve, the low-frequency band impedance phase angle, the mid-frequency band impedance phase angle, and the high-frequency band impedance phase angle corresponding to the characteristic frequency points are extracted respectively.

[0017] In some possible implementations, the standard impedance phase angle parameter includes: low-frequency standard impedance phase angle, mid-frequency standard impedance phase angle, and high-frequency standard impedance phase angle.

[0018] In some possible implementations, the step of obtaining the rate of change of impedance phase angle for each frequency band based on the impedance phase angle of each band and the standard impedance phase angle of each frequency band, and determining the fault degree of the dry-type reactor under test based on the rate of change of impedance phase angle for each frequency band, includes:

[0019] Calculate the rate of change of the phase angle in the low-frequency band based on the low-frequency band impedance phase angle and the low-frequency standard band impedance phase angle;

[0020] Calculate the low-frequency phase angle change rate based on the mid-frequency impedance phase angle and the mid-frequency standard band impedance phase angle;

[0021] Calculate the rate of change of the phase angle in the high-frequency band based on the high-frequency band impedance phase angle and the mid-frequency standard band impedance phase angle;

[0022] The maximum phase angle change rate is calculated based on the phase angle change rate in the low-frequency band, the phase angle change rate in the mid-frequency band, and the phase angle change rate in the high-frequency band. The fault degree of the dry reactor under test is determined based on the maximum phase angle change rate.

[0023] In some possible implementations, determining the fault degree of the dry-type reactor under test based on the maximum rate of change of the phase angle includes:

[0024] When the maximum rate of change of the phase angle is 0 < ΔP < 2%, it is determined that the dry-type reactor under test has a minor inter-turn short circuit fault.

[0025] When the maximum rate of change of the phase angle is 2% ≤ ΔP < 4%, it is determined that the dry-type reactor under test has a serious inter-turn short circuit fault.

[0026] When the maximum rate of change of the phase angle is 4% ≤ ΔP < 6%, the dry-type reactor is determined to have a serious inter-turn short circuit fault.

[0027] When the maximum rate of change of the phase angle ΔP ≥ 6%, the dry-type reactor is determined to have an extremely severe inter-turn short-circuit fault.

[0028] On the other hand, the present invention also provides a dry reactor fault detection system based on swept-frequency impedance phase angle, comprising:

[0029] The data acquisition module is used to acquire the impedance phase angle data of the dry-type reactor under test;

[0030] The data partitioning module is used to obtain the impedance phase angle frequency characteristic curve of the dry reactor under test based on the impedance phase angle data, and to partition the frequency characteristic curve according to the frequency range to obtain the frequency characteristic curve of each frequency band.

[0031] The feature acquisition module is used to obtain the impedance phase angle of the dry reactor under test in each frequency band based on the frequency characteristic curves of each frequency band.

[0032] The fault determination module is used to obtain the standard impedance phase angle parameters of each frequency band of the standard dry reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry reactor under test based on the impedance phase angle change rate of each frequency band.

[0033] On the other hand, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the dry reactor fault detection method based on swept frequency impedance phase angle in the above-described implementation.

[0034] Finally, the present invention also provides a storage medium storing computer program instructions, which, when executed by a computer, cause the computer to perform the dry reactor fault detection method based on swept frequency impedance phase angle in the above implementation.

[0035] The beneficial effects of the above embodiments are as follows: The dry-type reactor fault detection method based on swept-frequency impedance phase angle provided by the present invention has the following advantages: Firstly, since the selected detection electrical parameter is the impedance phase angle, the sensitivity to changes in the distributed parameters of the dry-type reactor winding is higher, thus enabling earlier detection of inter-turn short-circuit faults in the dry-type reactor. Secondly, by distinguishing the severity of inter-turn short-circuit faults in the dry-type reactor through the rate of change of impedance phase angle parameters corresponding to each characteristic frequency point, the inter-turn short-circuit insulation status of the dry-type reactor can be fed back more accurately. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0037] Figure 1 This is a flowchart illustrating an embodiment of the dry reactor fault detection method based on swept frequency impedance phase angle provided by the present invention.

[0038] Figure 2 This is a schematic diagram of an embodiment of the test environment setup provided by the present invention;

[0039] Figure 3 A flowchart illustrating an embodiment of the dry reactor fault detection system based on swept frequency impedance phase angle provided by the present invention.

[0040] Figure 4 A schematic diagram of the structure of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0041] 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] It should be understood that the illustrative drawings are not drawn to scale. The flowcharts used in this invention illustrate operations implemented according to some embodiments of the invention. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or performed simultaneously. Furthermore, those skilled in the art, guided by the content of this invention, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0043] Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] The specific embodiments are described in detail below. It should be noted that the order of the following descriptions of the embodiments is not intended to limit the preferred order of the embodiments.

[0046] This invention provides a method and system for fault detection of dry reactors based on swept frequency impedance phase angle.

[0047] like Figure 1 As shown, Figure 1 This is a flowchart illustrating an embodiment of the dry-type reactor fault detection method based on swept-frequency impedance phase angle provided by the present invention. The method includes:

[0048] S101. Obtain the impedance phase angle data of the dry-type reactor under test;

[0049] S102. Based on the impedance phase angle data, obtain the impedance phase angle frequency characteristic curve of the dry reactor under test, and divide the frequency characteristic curve according to the frequency range to obtain the frequency characteristic curve of each frequency band.

[0050] S103. Obtain the impedance phase angle of the dry-type reactor under test in each frequency band according to the frequency characteristic curve of each frequency band.

[0051] S104. Obtain the standard impedance phase angle parameters of each frequency band of the standard dry-type reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry-type reactor under test based on the impedance phase angle change rate of each frequency band.

[0052] Compared with the prior art, the dry-type reactor fault detection method based on swept-frequency impedance phase angle provided by the embodiments of the present invention has the following advantages: First, since the selected detection electrical parameter is the impedance phase angle, it has higher sensitivity to changes in the distributed parameters of the dry-type reactor winding, thus enabling earlier detection of inter-turn short-circuit faults in the dry-type reactor. Second, by distinguishing the severity of inter-turn short-circuit faults in the dry-type reactor through the rate of change of impedance phase angle parameters corresponding to each characteristic frequency point, it can more accurately reflect the insulation status of inter-turn short circuits in the dry-type reactor.

[0053] In a specific embodiment of the present invention, a test environment needs to be set up before testing, such as... Figure 2 As shown, Figure 2 This is a schematic diagram of an embodiment of the test environment setup provided by the present invention. The purpose of setting up the test environment is to quickly implement the dry reactor fault detection method based on swept-frequency impedance phase angle provided by the embodiment of the present invention. The test environment setup includes:

[0054] The special fixture 202 is installed to the special port 203 reserved on the impedance analyzer 201. The inlet arm 206 and outlet arm 208 of the dry reactor under test 207 are connected to the special fixture 202. At the same time, the inlet arm 206 and outlet arm 208 of the dry reactor under test 207 are grounded through the first sampling resistor 204 and the second sampling resistor 205, respectively. The impedance analyzer 201 transmits data to the computing device 210 through the data port 209. The resistance values ​​of the first sampling resistor 204 and the second sampling resistor 205 are 50Ω.

[0055] The impedance analyzer's sweep frequency range is selected from 10Hz to 10MHz.

[0056] In step S101, the start and end voltage signals of the dry-type reactor under test during the frequency sweep process are obtained by an impedance analyzer. and and input / output current signals and It is generally assumed that the input current and the output current are equal. The basic formula for calculating the impedance phase angle data of the dry-type reactor under test using an impedance analyzer is as follows:

[0057]

[0058] In the formula, P is the impedance phase angle; The impedance of the dry-type reactor was measured using an impedance analyzer. This is the voltage at the beginning of the dry-type reactor; This is the terminal voltage of the dry-type reactor; Input current for dry-type reactors; R1 is the output current of the dry-type reactor; R2 is the sampling resistor.

[0059] Furthermore, in some embodiments of the present invention, in step S102, an impedance phase angle frequency characteristic curve is plotted in a Cartesian coordinate system based on the impedance phase angle and the frequency corresponding to the impedance phase angle.

[0060] Based on the frequency range of the impedance phase angle frequency characteristic curve, the impedance phase angle frequency characteristic curve is divided into low-frequency band frequency characteristic curve, mid-frequency band frequency characteristic curve and high-frequency band frequency characteristic curve.

[0061] The low-frequency band corresponds to the range of 10Hz-100kHz, the mid-frequency band corresponds to the range of 100kHz-600kHz, and the high-frequency band corresponds to the range of 600kHz-10MHz. The purpose of the frequency band division is to adapt to the impact of inter-turn short-circuit faults on series inductance, series capacitance, distributed inductance, and distributed capacitance during the testing of dry-type reactors of different specifications.

[0062] Furthermore, in some embodiments of the present invention, in step S103: the low-frequency impedance phase angle, mid-frequency impedance phase angle and high-frequency impedance phase angle corresponding to the characteristic frequency points of the low-frequency band frequency characteristic curve, mid-frequency band frequency characteristic curve and high-frequency band frequency characteristic curve are extracted respectively.

[0063] Furthermore, in some embodiments of the present invention, in step S104:

[0064] The standard impedance phase angle parameters include: low-frequency standard impedance phase angle, mid-frequency standard impedance phase angle, and high-frequency standard impedance phase angle.

[0065] Calculate the rate of change of the phase angle in the low-frequency band based on the low-frequency band impedance phase angle and the low-frequency standard band impedance phase angle;

[0066] Calculate the low-frequency phase angle change rate based on the mid-frequency impedance phase angle and the mid-frequency standard band impedance phase angle;

[0067] Calculate the rate of change of the phase angle in the high-frequency band based on the high-frequency band impedance phase angle and the mid-frequency standard band impedance phase angle;

[0068] The maximum phase angle change rate is calculated based on the phase angle change rate in the low-frequency band, the phase angle change rate in the mid-frequency band, and the phase angle change rate in the high-frequency band. The fault degree of the dry reactor under test is determined based on the maximum phase angle change rate.

[0069] In some embodiments of the present invention, three impedance phase angles corresponding to the low, medium, and high frequency characteristic points of the dry-type reactor are extracted from the low-frequency band frequency characteristic curve, the mid-frequency band frequency characteristic curve, and the high-frequency band frequency characteristic curve, respectively: low-frequency band impedance phase angle P L Mid-frequency impedance phase angle P M and high-frequency impedance phase angle P H , where P L P M P H This includes the phase zero-crossing points within each of the three frequency bands. Due to the resolution limitations of the impedance analyzer, it is impossible to scan every characteristic frequency point. The method for handling phase zero-crossing points is as follows: Assume that there are two sequentially adjacent phase points on either side of the horizontal axis of the Cartesian coordinate system containing the impedance phase angular frequency characteristic curve P(ω), with corresponding frequencies Fr and Fr respectively. i and Fr i+1 The corresponding phase angles are P i and P i+1 Let the frequency and phase angle corresponding to the zero-crossing point of the phase between the two be Fr0 and P0, respectively. Then, the formula for calculating the frequency of the zero-crossing point of the phase is:

[0070]

[0071] Furthermore, the standard impedance phase angle frequency characteristic curve P of the standard dry-type reactor is obtained using the same method as in steps S101 to S103. n (ω), where the factory impedance phase angle frequency characteristic curve P of the dry-type reactor is... n (ω) Obtain the standard impedance phase angle frequency characteristic curve P of the θ-strip dry reactor by conducting θ experiments. n1 (ω), P n2 (ω), ..., P nθ (ω), and then processed by averaging:

[0072]

[0073] This process aims to stabilize the experimental results, with the number of experiments θ determined based on accuracy and safety requirements. The characteristic curve data is then stored for post-commissioning fault analysis; three standard impedance phase angles are used: low-frequency standard impedance phase angle P...nL Mid-frequency standard impedance phase angle P nM and the high-frequency standard impedance phase angle P nH These correspond to the impedance phase angle P in the low-frequency band. L Mid-frequency impedance phase angle P M and high-frequency impedance phase angle P H .

[0074] The reactor winding can be considered equivalent to an equivalent circuit with only resistance, inductance, and capacitance distributed parameters based on the multi-conductor transmission line theory. However, inter-turn short-circuit faults will affect the series inductance, series capacitance, distributed inductance, and distributed capacitance, changing the equivalent circuit parameters. This causes the zeros and poles of the characteristic curve under inter-turn short-circuit fault conditions to change, thus allowing the detection of whether an inter-turn short-circuit fault has occurred based on the change in the impedance phase angle of the dry reactor.

[0075] Among them, the phase angle change rate ΔP in the low frequency band L Mid-frequency phase angle change rate ΔP M High-frequency phase angle change rate ΔP H The calculation formulas are as follows:

[0076]

[0077]

[0078]

[0079] In the formula, x, y, and z represent the number of feature frequency points extracted in the low, medium, and high frequency bands according to steps S101 to S103, respectively.

[0080] Let ΔP = max{ΔP} L ,ΔP M ,ΔP H The degree of inter-turn short circuit fault in the dry reactor is determined by comparing it with the benchmark value.

[0081] When the maximum rate of change of the phase angle is 0 < ΔP < 2%, it is determined that the dry-type reactor under test has a minor inter-turn short circuit fault.

[0082] When the maximum rate of change of the phase angle is 2% ≤ ΔP < 4%, it is determined that the dry-type reactor under test has a serious inter-turn short circuit fault.

[0083] When the maximum rate of change of the phase angle is 4% ≤ ΔP < 6%, the dry-type reactor is determined to have a serious inter-turn short circuit fault.

[0084] When the maximum rate of change of the phase angle ΔP ≥ 6%, the dry-type reactor is determined to have an extremely severe inter-turn short-circuit fault.

[0085] The embodiments of the present invention differentiate the severity of inter-turn short-circuit faults in dry reactors by the rate of change of impedance phase angle parameters corresponding to each characteristic frequency point, which can more accurately reflect the insulation status of inter-turn short circuits in dry reactors.

[0086] To better implement the dry-type reactor fault detection method based on swept-frequency impedance phase angle in the embodiments of the present invention, the embodiments of the present invention also provide a dry-type reactor fault detection system based on swept-frequency impedance phase angle, such as... Figure 3 As shown, the dry-type reactor fault detection system 300 based on swept-frequency impedance phase angle includes:

[0087] Data acquisition module 301 is used to acquire the impedance phase angle data of the dry-type reactor under test;

[0088] The data partitioning module 302 is used to obtain the impedance phase angle frequency characteristic curve of the dry reactor under test based on the impedance phase angle data, and to partition the frequency characteristic curve according to the frequency range to obtain the frequency characteristic curve of each frequency band.

[0089] Feature acquisition module 303 is used to acquire the impedance phase angle of the dry reactor under test in each frequency band according to the frequency characteristic curve of each frequency band;

[0090] The fault determination module 304 is used to obtain the standard impedance phase angle parameters of each frequency band of the standard dry reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry reactor under test based on the impedance phase angle change rate of each frequency band.

[0091] The dry-type reactor fault detection system 300 based on swept frequency impedance phase angle provided in the above embodiments can realize the technical solutions described in the embodiments of the dry-type reactor fault detection method based on swept frequency impedance phase angle. The specific implementation principles of each module or unit can be found in the corresponding content in the embodiments of the dry-type reactor fault detection method based on swept frequency impedance phase angle, which will not be repeated here.

[0092] like Figure 4 As shown, the present invention also provides an electronic device 400. The electronic device 400 includes a processor 401, a memory 402, and a display 403. Figure 4 Only some components of the electronic device 400 are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0093] In some embodiments, processor 401 may be a central processing unit (CPU), microprocessor or other data processing chip, used to run program code stored in memory 402 or process data, such as the dry reactor fault detection program based on swept frequency impedance phase angle in this invention.

[0094] In some embodiments, processor 401 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 401 may be local or remote. In some embodiments, processor 401 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, intranet, multi-cloud, etc., or any combination thereof.

[0095] In some embodiments, memory 402 may be an internal storage unit of electronic device 400, such as a hard disk or memory of electronic device 400. In other embodiments, memory 402 may also be an external storage device of electronic device 400, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 400.

[0096] Furthermore, the memory 402 may include both internal storage units of the electronic device 400 and external storage devices. The memory 402 is used to store application software and various types of data installed on the electronic device 400.

[0097] In some embodiments, display 403 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 403 is used to display information from electronic device 400 and to display a visual user interface. Components 401-403 of electronic device 400 communicate with each other via a system bus.

[0098] In one embodiment, when the processor 401 executes the dry reactor fault detection program based on swept-frequency impedance phase angle in the memory 402, the following steps can be implemented:

[0099] Obtain the impedance phase angle data of the dry-type reactor under test;

[0100] Based on the impedance phase angle data, the impedance phase angle frequency characteristic curve of the dry reactor under test is obtained, and the frequency characteristic curve is divided according to the frequency range to obtain the frequency characteristic curve of each frequency band.

[0101] The impedance phase angle of the dry reactor under test in each frequency band is obtained based on the frequency characteristic curves of each frequency band.

[0102] Obtain the standard impedance phase angle parameters of each frequency band of the standard dry-type reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry-type reactor under test based on the impedance phase angle change rate of each frequency band.

[0103] It should be understood that when the processor 401 executes the dry reactor fault detection program based on swept frequency impedance phase angle in the memory 402, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0104] Furthermore, this embodiment of the invention does not specifically limit the type of electronic device 400 mentioned. Electronic device 400 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the invention, electronic device 400 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0105] Accordingly, this application also provides a computer-readable storage medium for storing computer-readable programs or instructions. When the programs or instructions are executed by a processor, they can implement the steps or functions of the dry reactor fault detection method based on swept frequency impedance phase angle provided in the above-described method embodiments.

[0106] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware (such as a processor, controller, etc.), and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0107] The above provides a detailed description of the dry reactor fault detection method, system, equipment, and medium based on swept frequency impedance phase angle provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for fault detection of dry-type reactors based on swept-frequency impedance phase angle, characterized in that, include: Obtain the impedance phase angle data of the dry-type reactor under test; Based on the impedance phase angle data, the impedance phase angle frequency characteristic curve of the dry reactor under test is obtained, and the frequency characteristic curve is divided according to the frequency range to obtain the frequency characteristic curve of each frequency band. The impedance phase angle of the dry reactor under test in each frequency band is obtained based on the frequency characteristic curves of each frequency band. Obtain the standard impedance phase angle parameters of each frequency band of the standard dry-type reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry-type reactor under test based on the impedance phase angle change rate of each frequency band. The impedance phase angle data includes: the impedance phase angle and the frequency corresponding to the impedance phase angle; The impedance phase angle frequency characteristic curve of the dry-type reactor under test is obtained based on the impedance phase angle data. The frequency characteristic curve is divided according to the frequency range to obtain the frequency characteristic curve of each frequency band, including: Plot the impedance phase angle frequency characteristic curve in a Cartesian coordinate system based on the impedance phase angle and the frequency corresponding to the impedance phase angle. Based on the frequency range of the impedance phase angle frequency characteristic curve, the impedance phase angle frequency characteristic curve is divided into low-frequency band frequency characteristic curve, mid-frequency band frequency characteristic curve and high-frequency band frequency characteristic curve. The step of obtaining the characteristic impedance phase angle of the dry-type reactor under test for each frequency band based on the frequency characteristic curves of each frequency band includes: Based on the characteristic frequency points of the low-frequency band frequency characteristic curve, the mid-frequency band frequency characteristic curve, and the high-frequency band frequency characteristic curve, extract the low-frequency band impedance phase angle, the mid-frequency band impedance phase angle, and the high-frequency band impedance phase angle corresponding to the characteristic frequency points, respectively. The standard impedance phase angle parameters include: low-frequency standard impedance phase angle, mid-frequency standard impedance phase angle, and high-frequency standard impedance phase angle; The process of obtaining the rate of change of impedance phase angle for each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determining the fault degree of the dry-type reactor under test based on the rate of change of impedance phase angle for each frequency band, includes: Calculate the rate of change of the phase angle in the low-frequency band based on the low-frequency band impedance phase angle and the low-frequency standard band impedance phase angle; Calculate the low-frequency phase angle change rate based on the mid-frequency impedance phase angle and the mid-frequency standard band impedance phase angle; Calculate the rate of change of the phase angle in the high-frequency band based on the high-frequency band impedance phase angle and the mid-frequency standard band impedance phase angle; The maximum phase angle change rate is calculated based on the phase angle change rate in the low-frequency band, the phase angle change rate in the mid-frequency band, and the phase angle change rate in the high-frequency band. The fault degree of the dry reactor under test is determined based on the maximum phase angle change rate.

2. The dry-type reactor fault detection method based on swept-frequency impedance phase angle according to claim 1, characterized in that, The determination of the fault degree of the dry-type reactor under test based on the maximum rate of change of the phase angle includes: When the maximum rate of change of the phase angle is 0 < Δ P If the value is less than 2%, the dry-type reactor under test is determined to have a minor inter-turn short circuit fault. When the maximum rate of change of the phase angle is 2% ≤ Δ P If the rate is less than 4%, the dry-type reactor under test is determined to have a serious inter-turn short-circuit fault. When the maximum rate of change of the phase angle is 4% ≤ ΔP < 6%, the dry-type reactor is determined to have a serious inter-turn short circuit fault. When the maximum rate of change of the phase angle ΔP ≥ 6%, the dry-type reactor is determined to have experienced an extremely severe inter-turn short-circuit fault.

3. A dry-type reactor fault detection system based on swept-frequency impedance phase angle, used to execute the dry-type reactor fault detection method based on swept-frequency impedance phase angle as described in any one of claims 1-2, characterized in that, include: The data acquisition module is used to acquire the impedance phase angle data of the dry-type reactor under test; The data partitioning module is used to obtain the impedance phase angle frequency characteristic curve of the dry reactor under test based on the impedance phase angle data, and to partition the frequency characteristic curve according to the frequency range to obtain the frequency characteristic curve of each frequency band. The feature acquisition module is used to obtain the impedance phase angle of the dry reactor under test in each frequency band based on the frequency characteristic curves of each frequency band. The fault determination module is used to obtain the standard impedance phase angle parameters of each frequency band of the standard dry reactor, obtain the impedance phase angle change rate of each frequency band based on the impedance phase angle of each frequency band and the standard impedance phase angle of each frequency band, and determine the fault degree of the dry reactor under test based on the impedance phase angle change rate of each frequency band.

4. An electronic device, characterized in that, The device includes a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the dry reactor fault detection method based on swept frequency impedance phase angle as described in any one of claims 1-2.

5. A storage medium, characterized in that, The storage medium stores computer program instructions, which, when executed by a computer, cause the computer to perform the dry reactor fault detection method based on swept frequency impedance phase angle as described in any one of claims 1-2.

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