Failure monitoring method, device and equipment for three-phase alternating current lightning protection device and medium

Abstract

The embodiment of the invention discloses a three-phase alternating current lightning protection device failure monitoring method, device and equipment and a medium, and relates to the technical field of three-phase alternating current lightning protection device safety monitoring. The method comprises the following steps: respectively obtaining the phase of the leakage current of the piezoresistor of the three-phase alternating current lightning protection device; obtaining the phase of the phase voltage of one phase of the three-phase AC lightning protection device; based on the phase of the phase voltage of one phase of the three-phase alternating current lightning protection device, determining the phase of the phase voltage of the other two phases of the three-phase alternating current lightning protection device; whether the phase difference between the phase of the leakage current of the piezoresistor and the phase of the phase voltage corresponding to the piezoresistor is smaller than a preset phase difference threshold value or not is judged; if the phase difference is smaller than the phase difference threshold value, it is judged that the piezoresistor fails. According to the invention, the hardware complexity of the three-phase alternating current lightning protection device can be reduced, the early warning of the degradation of the piezoresistor is realized, and the safety and economy of a lightning protection system are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of three-phase AC lightning arrester safety monitoring, and in particular to a three-phase AC lightning arrester failure monitoring method, device, equipment and medium. Background Art

[0002] As a key lightning protection device in power systems, varistors are widely used in the field of lightning protection due to their large current-carrying capacity, stable performance, and strong consistency. Their core function is to absorb transient overvoltage energy through their nonlinear volt-ampere characteristics, thereby protecting back-end equipment from damage caused by lightning strikes or operational overvoltages. However, during long-term operation, varistors will degrade due to repeated exposure to impact currents or environmental factors. The initial stage of degradation manifests as a gradual increase in resistive leakage current, which leads to an increase in device temperature rise. If degradation continues to develop, two serious consequences may occur: first, abnormal heating caused by leakage current may ignite the device or surrounding materials, creating a fire hazard; second, the clamping voltage characteristics of the varistor are significantly degraded, resulting in the failure of the lightning protection function and threatening the safe operation of the power system. Therefore, real-time monitoring of the degradation state of the varistor is crucial to ensuring the reliability of the lightning protection system.

[0003] Currently, the industry generally uses thermal trip devices as a means of protecting against varistor failure. This device detects temperature changes in the varistor and triggers a mechanical trip mechanism when the temperature exceeds a safety threshold, removing the degraded varistor from the circuit while simultaneously sending an alarm signal through an indicator window or communication interface. However, this type of solution has significant flaws: First, thermal tripping is a passive protection mechanism that only operates when the varistor has severely degraded or is nearing failure, providing no early warning. This puts the lightning protection system at risk of insufficient protection capabilities from the mid-stage of degradation to the stage before tripping. Second, after tripping, manual component replacement is required, resulting in delayed maintenance responses and potentially exacerbating system safety risks.

[0004] To overcome the above problems, some technical solutions attempt to predict degradation trends by monitoring the resistive leakage current of the varistor. Under normal operating conditions, the leakage current of the varistor is mainly capacitive, and its phase leads the applied phase voltage by about 90 degrees. As degradation worsens, the resistive leakage current component gradually increases, and the phase difference between the leakage current and the phase voltage decreases accordingly. By detecting changes in the phase difference, it is theoretically possible to identify risks before the varistor deteriorates seriously. However, existing implementation methods have significant limitations: for three-phase AC lightning protection systems, the phase angle of each phase voltage and leakage current needs to be measured separately, which requires independent voltage sensors and current sensors for each phase. For example, in a three-phase three-wire or four-wire system, three voltage sensors and three current sensors need to be deployed, resulting in high hardware costs, complex system wiring, and significantly increased difficulty in synchronously processing multi-channel signals. In addition, the increase in the number of sensors will introduce more failure points, reducing the overall reliability of the system.

[0005] In summary, existing varistor degradation monitoring solutions face a core contradiction: the passive nature of the thermal trip mechanism and the complexity of resistive leakage current detection. The former prevents preventive maintenance, while the latter, while capable of early identification of degradation, is limited by the high cost and low reliability of multi-sensor configurations, hindering large-scale engineering application. Therefore, a monitoring method that reduces hardware complexity while providing early warning of varistor degradation is urgently needed to improve the safety and cost-effectiveness of lightning protection systems. Summary of the Invention

[0006] The embodiments of the present invention provide a three-phase AC lightning arrester failure monitoring method, device, equipment and medium, aiming to provide a monitoring method that can reduce hardware complexity and achieve early warning of varistor degradation, thereby improving the safety and economy of the lightning protection system.

[0007] In a first aspect, an embodiment of the present invention provides a method for monitoring failure of a three-phase AC lightning arrester, comprising:

[0008] Obtain the phase of the leakage current of the varistor of the three-phase AC lightning arrester respectively;

[0009] Obtaining the phase of the phase voltage of one phase of the three-phase AC lightning arrester;

[0010] Determining the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester;

[0011] Determining whether a phase difference between a phase of a leakage current of the varistor and a phase voltage corresponding to the varistor is less than a preset phase difference threshold;

[0012] If the phase difference is less than the phase difference threshold, it is determined that the varistor has failed.

[0013] A further technical solution is that the phases of the leakage currents of the varistors of the three-phase AC lightning arrester are obtained respectively, including:

[0014] collecting a current signal of the leakage current of the varistor by a current sensor;

[0015] Perform an FFT operation on the current signal to determine the phase of the leakage current of the varistor.

[0016] A further technical solution is that the collecting of the phase of the phase voltage of one phase of the three-phase AC lightning arrester includes:

[0017] The voltage sampling circuit collects a voltage signal of a phase voltage of one phase of the three-phase AC lightning arrester;

[0018] Perform an FFT operation on the voltage signal to determine the phase of the phase voltage of one phase of the three-phase AC lightning arrester.

[0019] A further technical solution is that the three-phase AC lightning arrester is a 4P structured intelligent lightning arrester, wherein the voltage between the phase line and the neutral line of one phase of the three-phase AC lightning arrester is used as the phase voltage of one phase of the three-phase AC lightning arrester.

[0020] A further technical solution is that the phase of the phase voltage of one phase of the three-phase AC lightning arrester is determined based on the phase of the phase voltage of the other two phases of the three-phase AC lightning arrester, including:

[0021] The phases of the phase voltages of one phase of the three-phase AC lightning arrester are shifted by 120° and 240° respectively to obtain the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester.

[0022] A further technical solution is that the phase difference threshold is 70-75°.

[0023] A further technical solution is that the voltage signal and the current signal are sampled using the same time window.

[0024] In a second aspect, an embodiment of the present invention further provides a three-phase AC lightning arrester failure monitoring device, which includes a unit for executing the above method.

[0025] In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the above method when executing the computer program.

[0026] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program can implement the above method when executed by a processor.

[0027] The embodiment of the present invention provides a method, device, equipment and medium for monitoring the failure of a three-phase AC lightning arrester. The method includes: respectively obtaining the phase of the leakage current of the varistor of the three-phase AC lightning arrester; obtaining the phase of the phase voltage of one phase of the three-phase AC lightning arrester; based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester, determining the phase of the phase voltage of the other two phases of the three-phase AC lightning arrester; judging whether the phase difference between the phase of the leakage current of the varistor and the phase of the phase voltage corresponding to the varistor is less than a preset phase difference threshold; if the phase difference is less than the phase difference threshold, determining that the varistor has failed. The present invention can reduce the hardware complexity of the three-phase AC lightning arrester, achieve early warning of varistor degradation, and significantly improve the safety and economy of the lightning protection system.

[0028] Specifically, the present invention obtains the phase of the three-phase varistor leakage current and the phase voltage of one phase, and derives the reference phase of the other two phases based on this phase voltage phase. Finally, the varistor failure is determined by comparing whether the phase difference between the leakage current and the corresponding phase voltage is below a preset threshold. The core technical benefits of this solution are reflected in the following aspects: First, by measuring only the single-phase voltage and using the fixed phase relationship of the three-phase voltages to generate the reference phase of the remaining two phases, the number of voltage sensors required in traditional solutions is significantly reduced from three to one, thereby significantly reducing hardware cost and system complexity. Second, the judgment logic based on the phase difference threshold can proactively identify early degradation trends of the varistor. Compared with the passive response mechanism of traditional thermal trip devices, it effectively avoids the degradation of lightning protection capabilities or the risk of fire caused by delayed maintenance. In addition, because the actual phase error of the three-phase power grid is typically less than 1°, far below the preset phase difference threshold, the reference phase generated by single-phase voltage phase simulation has sufficient accuracy to ensure the reliability of degradation judgment. The method proposed in the present invention combines algorithm optimization with hardware simplification, thereby improving the economy and practicality of the lightning protection system while ensuring monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a three-phase AC lightning arrester provided in an embodiment of the present invention;

[0031] Figure 2 A schematic structural diagram of a three-phase AC lightning arrester provided in another embodiment of the present invention;

[0032] Figure 3 A schematic flow chart of a method for monitoring failure of a three-phase AC lightning arrester provided by an embodiment of the present invention;

[0033] Figure 4 A schematic block diagram of a computer device provided in an embodiment of the present invention.

[0034] Reference numerals

[0035] The lightning arrester body 10, the first current sensor 20, the second current sensor 30, the third current sensor 40, the lightning arrester monitoring module 50, the first varistor 11, the second varistor 12, the third varistor 13, the fourth varistor 14, the discharge tube 15, the AC / DC power conversion module 51, the first voltage dividing resistor 52, the second voltage dividing resistor 53, the isolation transformer 54, the amplification and filtering unit 55, and the single-chip microcomputer subsystem 56. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0038] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0039] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0040] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0041] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a three-phase AC lightning arrester provided by an embodiment of the present invention. The three-phase AC lightning arrester is a 4P structured three-phase intelligent lightning arrester suitable for TN-S systems. Figure 2 , Figure 2 This figure shows the structure of a three-phase AC lightning arrester according to another embodiment of the present invention. This three-phase AC lightning arrester is a 3+NPE intelligent lightning arrester suitable for TT systems. This article uses a 4P intelligent lightning arrester as an example to illustrate the implementation of a three-phase intelligent lightning arrester. The implementation principles and methods of a 3+NPE intelligent lightning arrester are essentially the same and will not be further elaborated in this invention.

[0042] See also Figure 1 The 4P structure three-phase intelligent lightning arrester includes a lightning arrester body 10, three current sensors (a first current sensor 20, a second current sensor 30 and a third current sensor 40), and a lightning arrester monitoring module 50.

[0043] The lightning arrester body 10 includes a first varistor 11, a second varistor 12, a third varistor 13 and a fourth varistor 14. The first varistor 11 is located between the phase line L1 and the ground line PE, the second varistor 12 is located between the phase line L2 and the ground line PE, the third varistor 13 is located between the phase line L3 and the ground line PE, and the fourth varistor 14 is located between the neutral line N and the ground line PE.

[0044] The first current sensor 20, the second current sensor 30, and the third current sensor 40 can be current transformers for measuring conductor current. Phase lines L1, L2, and L3 respectively pass through the first current sensor 20, the second current sensor 30, and the third current sensor 40 and are connected to the terminals of the first varistor 11, the second varistor 12, and the third varistor 13 of the lightning arrester. The current flowing through the first varistor 11, the second varistor 12, and the third varistor 13 can generate an induced voltage at the output of the current transformer that is linearly related to the leakage current. To reduce the number of cables, the output terminals of the first current sensor 20, the second current sensor 30, and the third current sensor 40 can share a common terminal as a reference output terminal. This reduces the number of cables connecting the three current sensors to the lightning arrester monitoring module 50 from six to four. These four cables input the three induced voltages into the lightning arrester monitoring module 50.

[0045] The lightning arrester monitoring module 50 consists of an AC / DC power conversion module 51, a first voltage-dividing resistor 52, a second voltage-dividing resistor 53, an isolation transformer 54, an amplifier and filter unit 55, and a single-chip microcomputer subsystem 56. The AC / DC power conversion module 51 is connected to the phase line L1 and the neutral line N, and is used to convert AC power into DC power to power the other components of the lightning arrester monitoring module 50. The first voltage-dividing resistor 52 and the second voltage-dividing resistor 53 are connected in series between the phase line L1 and the neutral line N to form a voltage-dividing circuit. The primary winding of the isolation transformer 54 is connected in parallel across the second voltage-dividing resistor 53, and the secondary winding outputs a sampled voltage, which is connected to the single-chip microcomputer subsystem 56 via the amplifier and filter unit 55. Each current sensor is connected to the single-chip microcomputer subsystem 56 via an amplifier and filter unit 55.

[0046] See also Figure 2 , suitable for TT system 3+NPE type intelligent lightning arrester and Figure 1 The difference of the 4P structure three-phase intelligent lightning arrester shown is that the neutral line N is connected to the ground line PE through the discharge tube 15.

[0047] Accordingly, see Figure 3 The embodiment of the present invention provides a method for monitoring failure of a three-phase AC lightning arrester. The method is applied to the three-phase AC lightning arrester provided in any of the above embodiments. The method includes the following steps:

[0048] S1, respectively obtaining the phases of the leakage currents of the varistors of the three-phase AC lightning arrester.

[0049] In a specific implementation, the leakage current of each varistor of the three-phase AC lightning arrester is collected respectively, and the phase of each leakage current is calculated accordingly.

[0050] For example, in a preferred embodiment, the above step S1 specifically includes: collecting a current signal of the leakage current of the varistor through a current sensor; and performing an FFT operation on the current signal to determine the phase of the leakage current of the varistor.

[0051] In a specific implementation, the current signal of the leakage current of the varistor is collected by a current sensor, and the current signal is input into an amplification and filtering unit for signal amplification and filtering processing, and then the current signal is subjected to FFT operation to determine the phase of the leakage current of the varistor.

[0052] The FFT (Fast Fourier Transform) is an efficient algorithm used to convert time-domain signals (time-varying signals, such as voltage or current waveforms) into frequency-domain signals (amplitude and phase information of different frequency components). In this embodiment of the present invention, the FFT is used to extract the fundamental phase of the current signal, that is, to obtain the phase of the leakage current.

[0053] In this embodiment, the leakage current signal is collected by a current sensor, and its phase information is extracted using FFT operation. The direct effect brought about by this technical feature is to improve the accuracy and anti-interference ability of phase detection. FFT (Fast Fourier Transform) can convert the time domain current signal into a frequency domain spectrum, accurately separate the fundamental component (such as 50 / 60Hz power frequency signal), and avoid the interference of high-frequency noise or harmonics on the phase calculation. Compared with the traditional time domain zero-crossing detection or simple filtering method, the FFT algorithm can accurately extract the fundamental phase and ensure the accuracy of the calculation of the leakage current and voltage phase difference. At the same time, the high efficiency of FFT makes it suitable for embedded systems (such as single-chip microcomputers) to meet real-time monitoring needs. In addition, the use of current sensors ensures non-invasive measurement, avoids changes to the original circuit structure, and enhances the engineering applicability of the solution.

[0054] S2: Obtain the phase of the phase voltage of one phase of the three-phase AC lightning arrester.

[0055] In a specific implementation, the phase of the phase voltage of one phase of the three-phase AC lightning arrester is obtained, which may be the phase of the phase voltage of any phase, and is not specifically limited in the present invention.

[0056] For example, in a preferred embodiment, the above step S2 specifically includes: collecting the voltage signal of the phase voltage of one phase of the three-phase AC lightning arrester through a voltage sampling circuit; performing FFT operation on the voltage signal to determine the phase of the phase voltage of one phase of the three-phase AC lightning arrester.

[0057] In a specific implementation, the voltage sampling circuit includes Figure 1-Figure 2 The first voltage-dividing resistor, the second voltage-dividing resistor and the isolation transformer are not specifically limited in the present invention.

[0058] A voltage sampling circuit collects a voltage signal of the phase voltage of one phase of the three-phase AC lightning arrester; the voltage signal is input into an amplification and filtering unit for signal amplification and filtering, and then an FFT operation is performed on the voltage signal to determine the phase of the phase voltage of one phase of the three-phase AC lightning arrester. The FFT operation is used to extract the fundamental phase of the voltage signal, that is, to obtain the phase of the phase voltage of one phase.

[0059] In this embodiment, the acquisition process of the single-phase voltage phase is clarified, including collecting the voltage signal through the voltage sampling circuit and extracting the phase using the FFT operation. Its technical effects are mainly reflected in two aspects: First, the design of the voltage sampling circuit (such as the voltage divider resistor and the isolation transformer) realizes the voltage reduction and electrical isolation of the high-voltage signal, which not only ensures the measurement safety but also avoids interference with the power supply network. Second, the application of FFT operation in voltage signal processing ensures the high-precision extraction of the fundamental phase. Since the voltage signal may contain harmonics or transient noise, FFT can effectively filter out non-power frequency components and extract a pure fundamental phase as a reference benchmark.

[0060] Furthermore, in an embodiment of the present invention, when the three-phase AC lightning arrester is a 4P structured intelligent lightning arrester, the voltage between the phase line and the neutral line of one phase of the three-phase AC lightning arrester is used as the phase voltage of one phase of the three-phase AC lightning arrester.

[0061] In this embodiment, when the three-phase AC lightning arrester is a 4P structured intelligent lightning arrester, the voltage between the phase line and the neutral line (LN) is used as the phase voltage measurement benchmark. The core effect of this technical feature is to optimize the security of the voltage detection path. In the TN-S power supply system, the neutral line (N) and the protective ground line (PE) are connected together at the power supply end but are independent at the user end. Directly measuring the L-PE voltage may cause leakage current to flow into the ground network through the PE line due to equipment insulation defects, threatening the security of the power supply network. The use of LN voltage measurement can not only avoid the risk of PE line-related leakage current, but also because the LN and L-PE voltage amplitudes are similar (the phase difference can be ignored), it can be equivalent to replacing the traditional L-PE voltage detection, while ensuring the accuracy of the measurement and the compatibility of the system. In addition, this design reduces the dependence on the PE line, simplifies the wiring complexity of the lightning arrester monitoring module, and is particularly suitable for industrial scenarios that require strict grounding safety requirements.

[0062] In some preferred embodiments, the voltage signal and the current signal are sampled using the same time window.

[0063] Specifically, in power system monitoring, the phase relationship between voltage and current signals is extremely sensitive to time synchronization. If there is an offset in the sampling time windows of the two, it will directly lead to phase difference calculation deviation. Through strict synchronous sampling, the voltage and current signals are collected and processed at the same time, avoiding the introduction of phase errors due to sampling delays. In addition, synchronous sampling combined with the spectrum analysis characteristics of FFT can ensure the consistency of fundamental phase extraction, especially in scenarios with grid frequency fluctuations or harmonic interference, and can still maintain high-precision judgment. This design further improves the reliability and robustness of the degradation monitoring system through the coordinated optimization of hardware and algorithms.

[0064] S3 : Based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester, determine the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester.

[0065] In a specific implementation, the phase difference between the three phases of the three-phase AC lightning arrester is fixed, and the phase difference between two adjacent phases is 120°. Therefore, the phase of the phase voltage of one phase of the three-phase AC lightning arrester is shifted by 120° and 240° respectively to obtain the phase of the phase voltage of the other two phases of the three-phase AC lightning arrester.

[0066] In a three-phase balanced system, the phase difference between the phase voltages strictly follows a 120° interval. Therefore, by performing a fixed-angle phase shift calculation based on the measured single-phase phase, the theoretical phase values ​​of the remaining two phases can be simulated with extremely low error (usually less than 1°). Compared with the traditional solution of independently measuring the three-phase voltages, this method does not require additional voltage sensors and signal processing channels, significantly reducing hardware costs and wiring complexity. At the same time, because the actual phase fluctuations of the power grid are far smaller than the judgment threshold (such as the degradation threshold of 70-75°), the impact of the simulated phase error on the judgment result is negligible. This solution achieves the dual goals of system simplification and cost optimization by replacing hardware redundancy with algorithms.

[0067] S4, determining whether a phase difference between a phase of the leakage current of the varistor and a phase voltage corresponding to the varistor is smaller than a preset phase difference threshold.

[0068] In a specific implementation, a phase difference between a phase of a leakage current of the varistor and a phase voltage corresponding to the varistor is calculated, and it is determined whether the phase difference is less than a preset phase difference threshold.

[0069] If the phase difference is not less than a preset phase difference threshold, it is determined that the varistor is not failed.

[0070] In some preferred embodiments, the phase difference threshold is 70-75°.

[0071] In the normal state of the varistor, the leakage current is mainly composed of a capacitive component, and its phase leads the phase voltage by about 90°; as the degradation intensifies, the resistive component gradually increases, resulting in a gradual decrease in the phase difference. The inventors of the present application have found that when the phase difference drops to 70-75°, the clamping voltage characteristics of the varistor have significantly degraded, and the lightning protection performance cannot meet the requirements. Setting this threshold not only avoids misjudgments caused by a threshold that is too high (such as 80°), but also prevents missed judgments caused by a threshold that is too low (such as 60°), achieving a balance between safety and economy. In addition, the universal design of this threshold range is applicable to varistors of different brands or models, which enhances the versatility and engineering applicability of the solution.

[0072] S5: If the phase difference is less than the phase difference threshold, determine that the varistor is failed.

[0073] In a specific implementation, if the phase difference is smaller than the phase difference threshold, it is determined that the varistor has failed.

[0074] Furthermore, a replacement reminder can be issued to remind the user to replace the failed varistor, so that the varistor can be replaced in advance, ensuring safety.

[0075] An embodiment of the present invention proposes a method for monitoring the failure of a three-phase AC lightning arrester. This method obtains the phase of the leakage current of a three-phase varistor and the phase voltage of one phase, and derives the reference phase of the other two phases based on this phase voltage phase. Finally, the varistor failure is determined by comparing whether the phase difference between the leakage current and the corresponding phase voltage is below a preset threshold. The core technical benefits of this solution are reflected in the following aspects: First, by measuring only a single-phase voltage and using the fixed phase relationship of the three-phase voltages to generate the reference phase for the remaining two phases, the number of voltage sensors required in traditional solutions is significantly reduced from three to one, significantly reducing hardware cost and system complexity. Second, the judgment logic based on the phase difference threshold can proactively identify early degradation trends of the varistor. Compared to the passive response mechanism of traditional thermal trip devices, this effectively avoids the degradation of lightning protection capabilities or the risk of fire caused by delayed maintenance. Furthermore, because the actual phase error of a three-phase power grid is typically less than 1°, far below the preset phase difference threshold, the reference phase generated by single-phase voltage phase simulation is sufficiently accurate to ensure the reliability of degradation judgment. The method proposed in the present invention combines algorithm optimization with hardware simplification, thereby improving the economy and practicality of the lightning protection system while ensuring monitoring accuracy.

[0076] Corresponding to the above three-phase AC lightning arrester failure monitoring method, the present invention also provides a three-phase AC lightning arrester failure monitoring device. The three-phase AC lightning arrester failure monitoring device includes a unit for executing the above three-phase AC lightning arrester failure monitoring method. The three-phase AC lightning arrester failure monitoring device can be configured in a terminal, such as a three-phase AC lightning arrester. Specifically, the three-phase AC lightning arrester failure monitoring device includes:

[0077] A first acquiring unit is used to respectively acquire the phase of the leakage current of the varistor of the three-phase AC lightning arrester;

[0078] A second acquiring unit is used to acquire the phase of the phase voltage of one phase of the three-phase AC lightning arrester;

[0079] a determining unit, configured to determine the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester;

[0080] a judging unit, configured to judge whether a phase difference between a phase of a leakage current of the varistor and a phase voltage corresponding to the varistor is less than a preset phase difference threshold;

[0081] A determination unit is configured to determine that the varistor has failed if the phase difference is less than the phase difference threshold.

[0082] In a preferred embodiment, respectively obtaining the phases of the leakage currents of the varistors of the three-phase AC lightning arrester includes:

[0083] collecting a current signal of the leakage current of the varistor by a current sensor;

[0084] Perform an FFT operation on the current signal to determine the phase of the leakage current of the varistor.

[0085] In a preferred embodiment, the collecting the phase of the phase voltage of one phase of the three-phase AC lightning arrester includes:

[0086] The voltage sampling circuit collects a voltage signal of a phase voltage of one phase of the three-phase AC lightning arrester;

[0087] Perform an FFT operation on the voltage signal to determine the phase of the phase voltage of one phase of the three-phase AC lightning arrester.

[0088] In a preferred embodiment, the three-phase AC lightning arrester is a 4P structured intelligent lightning arrester, wherein the voltage between the phase line and the neutral line of one phase of the three-phase AC lightning arrester is used as the phase voltage of one phase of the three-phase AC lightning arrester.

[0089] In a preferred embodiment, determining the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester includes:

[0090] The phases of the phase voltages of one phase of the three-phase AC lightning arrester are shifted by 120° and 240° respectively to obtain the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester.

[0091] In a preferred embodiment, the phase difference threshold is 70-75°.

[0092] In a preferred embodiment, the voltage signal and the current signal are sampled using the same time window.

[0093] It should be noted that technicians in the relevant field can clearly understand that the specific implementation process of the above-mentioned three-phase AC lightning arrester failure monitoring device and each unit can refer to the corresponding description in the aforementioned method embodiment. For the convenience and brevity of description, it will not be repeated here.

[0094] The above three-phase AC lightning arrester failure monitoring device can be implemented in the form of a computer program. The computer program can be used in Figure 4 Runs on the computer equipment shown.

[0095] See also Figure 4 , Figure 4 1 is a schematic block diagram of a computer device provided in an embodiment of the present application. The computer device 500 may be a terminal, such as a three-phase AC lightning arrester.

[0096] The computer device 500 includes a processor 502 , a memory, and a network interface 505 connected via a system bus 501 , wherein the memory may include a non-volatile storage medium 503 and an internal memory 504 .

[0097] The non-volatile storage medium 503 can store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, the processor 502 can execute a method for monitoring failure of a three-phase AC lightning arrester.

[0098] The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500.

[0099] The internal memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute a method for monitoring failure of a three-phase AC lightning arrester.

[0100] The network interface 505 is used to communicate with other devices over the network. Those skilled in the art will appreciate that the above structure is merely a block diagram of a portion of the structure related to the present invention and does not limit the computer device 500 to which the present invention is applied. A specific computer device 500 may include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0101] The processor 502 is configured to run a computer program 5032 stored in a memory to implement the steps of a method for monitoring failure of a three-phase AC lightning arrester provided in any embodiment of the present invention.

[0102] It should be understood that in the embodiment of the present application, the processor 502 may be a central processing unit (CPU), and the processor 502 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0103] Those skilled in the art will appreciate that all or part of the steps in the method of the above-described embodiment can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the steps in the method of the above-described embodiment.

[0104] Therefore, the present invention further provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program. When executed by a processor, the computer program causes the processor to perform the steps of a three-phase AC lightning arrester failure monitoring method provided in any embodiment of the present invention.

[0105] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a magnetic disk, or an optical disk, etc. Any physical storage medium capable of storing program code can be non-volatile or volatile.

[0106] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0107] In the several embodiments provided herein, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the various units is merely a logical functional division, and actual implementation may employ other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented.

[0108] The steps in the methods of the embodiments of the present invention may be adjusted in order, combined, or deleted as needed. The units in the devices of the embodiments of the present invention may be combined, divided, or deleted as needed. Furthermore, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0109] If this integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the existing technology, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, terminal, or network device, etc.) to execute all or part of the steps of the method described in various embodiments of the present invention.

[0110] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0111] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, to the extent such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0112] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A three-phase AC lightning arrester failure monitoring method, characterized in that: include: Obtain the phase of the leakage current of the varistor of the three-phase AC lightning arrester respectively; Obtaining the phase of the phase voltage of one phase of the three-phase AC lightning arrester; Determining the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester; Determining whether a phase difference between a phase of a leakage current of the varistor and a phase voltage corresponding to the varistor is less than a preset phase difference threshold; If the phase difference is less than the phase difference threshold, it is determined that the varistor has failed.

2. The three-phase AC lightning arrester failure monitoring method according to claim 1, characterized in that: The respectively obtaining the phases of the leakage currents of the varistors of the three-phase AC lightning arrester includes: collecting a current signal of the leakage current of the varistor by a current sensor; Perform an FFT operation on the current signal to determine the phase of the leakage current of the varistor.

3. The three-phase AC lightning arrester failure monitoring method according to claim 2, characterized in that: The collecting of the phase of the phase voltage of one phase of the three-phase AC lightning arrester includes: The voltage sampling circuit collects a voltage signal of a phase voltage of one phase of the three-phase AC lightning arrester; Perform an FFT operation on the voltage signal to determine the phase of the phase voltage of one phase of the three-phase AC lightning arrester.

4. The method for monitoring failure of a three-phase AC lightning arrester according to claim 3, characterized in that: The three-phase AC lightning arrester is a 4P structured intelligent lightning arrester, wherein the voltage between the phase line and the neutral line of one phase of the three-phase AC lightning arrester is used as the phase voltage of one phase of the three-phase AC lightning arrester.

5. The method for monitoring failure of a three-phase AC lightning arrester according to claim 1, characterized in that: The determining, based on the phase of the phase voltage of one phase of the three-phase AC lightning arrester, the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester includes: The phases of the phase voltages of one phase of the three-phase AC lightning arrester are shifted by 120° and 240° respectively to obtain the phases of the phase voltages of the other two phases of the three-phase AC lightning arrester.

6. The method for monitoring failure of a three-phase AC lightning arrester according to claim 1, characterized in that: The phase difference threshold is 70-75°.

7. The method for monitoring failure of a three-phase AC lightning arrester according to claim 3, characterized in that: The voltage signal and the current signal are sampled using the same time window.

8. A three-phase AC lightning arrester failure monitoring device, characterized in that: The method comprises a unit for executing the method according to any one of claims 1 to 7.

9. A computer device, characterized in that: The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by a processor, the computer program can implement the method according to any one of claims 1 to 7.

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