A method and system for phase checking of GIS substation surge arresters

Abstract

The application provides a method and system for nuclear phase of GIS substation system arrester, and relates to the technical field of electric power detection. The method comprises the following steps: acquiring voltage signals of multiple low-voltage lines; converting the voltage signals into low-voltage signals through an arrester and a bus; performing digital signal processing on the low-voltage signals through a transmitter; performing filtering processing on the low-voltage signals after digital signal processing through a low-pass filter to obtain filtered signals; calculating phase differences of the filtered signals through a zero-crossing detection algorithm; performing consistency determination on phases of each line according to the phase differences; and transmitting each filtered signal to a monitoring center through a GC433 wireless module. The method solves the nuclear phase problem caused by the closed structure of the GIS substation system by acquiring signals through the grounding point of the arrester, realizes the live nuclear phase, and does not need to power off and disassemble the cable terminal.

Description

Technical Field

[0001] This invention relates to the field of power detection technology, and in particular to a method and system for phase verification using surge arresters in GIS substations. Background Technology

[0002] The primary circuits of a GIS substation are fully enclosed, making traditional phase matching difficult to implement. Furthermore, when matching phases through the output cable shielding layer, the phase value at the grounding point is unstable due to the cross-interconnection of the shielding layers and the capacitive coupling between the core wire and the shield, making it impossible to obtain a phase consistent with the main line. However, the grounding point of a zinc oxide surge arrester, under normal operating voltage, generates a small low-voltage signal consistent with the busbar phase, providing a feasible path for live phase matching in the GIS system.

[0003] Existing phase detection technologies mainly rely on surge arresters and busbars to convert high-voltage lines into low-voltage signals, and then combine low-voltage sensing sampling technology to realize phase detection in GIS systems. At the same time, wireless communication modules are used for data transmission, in an attempt to solve the phase detection problem in closed environments.

[0004] However, existing technologies suffer from insufficient signal acquisition and conversion accuracy. The enclosed environment makes traditional acquisition techniques difficult to apply, leading to attenuation, distortion, or interference in low-voltage signals. Furthermore, accurate phase difference calculation is challenging, affected by wireless signal delay, noise, hardware limitations, and computational errors, resulting in high phase comparison costs, low detection efficiency, and potential hazards. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for phase comparison using surge arresters in GIS substations. This method can solve the problems of insufficient acquisition and conversion accuracy, difficulty in applying traditional acquisition techniques due to the enclosed environment, and the tendency for low-voltage signals to attenuate, distort, or interfere. Furthermore, the method is difficult to calculate the phase difference accurately, and is affected by wireless signal delay, noise, hardware, and calculation errors, resulting in high phase comparison costs, low phase comparison detection efficiency, and potential hazards.

[0006] A first aspect of this invention provides a method for phase verification using surge arresters in a GIS substation, comprising: S1: Acquire voltage signals from multiple low-voltage lines.

[0007] S2: Converts voltage signals into low-voltage signals through surge arresters and busbars.

[0008] S3: The low-voltage signal is digitally processed by the transmitter.

[0009] S4: The low-voltage signal after digital signal processing is filtered by a low-pass filter to obtain a filtered signal.

[0010] S5: Calculate the phase difference of the filtered signal using a zero-crossing detection algorithm.

[0011] S6: Based on the phase difference, determine the consistency of the phase of each line.

[0012] S7: The phase difference of each of the filtered signals is transmitted to the monitoring center via the GC433 wireless module.

[0013] In a second aspect of the present invention, a system for phase matching using surge arresters in a GIS substation is proposed, comprising: a processor and a memory.

[0014] The memory stores a program or instructions that can run on a processor, which, when executed by the processor, implement the steps of the method for phase matching using surge arresters in a GIS substation, as described in the first aspect.

[0015] A third aspect of the present invention provides a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method for phase verification using surge arresters in a GIS substation as described in the first aspect.

[0016] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this embodiment of the invention, a sine wave is converted into a square wave using a zero-crossing detection algorithm. Wireless synchronization technology is used to accurately measure the time difference between the zero-crossing moments of two detection points, thereby calculating the phase difference of the filtered signal. This, combined with wireless communication technology, allows phase comparison detection to be applied in a closed environment, reducing the attenuation of low-voltage signals and minimizing distortion or interference. Voltage signals are obtained from low-voltage lines via capacitive coupling or induction. Based on the phase difference, the consistency of the phases of each line is determined, improving conversion accuracy. Simultaneously, phase comparison is performed using the grounding point of the GIS surge arrester busbar grounding device, replacing the complex scheme of disconnecting and disassembling cable terminals required for phase comparison in GIS systems. This enables direct phase comparison detection while the system is energized, improving the safety and efficiency of phase comparison detection and reducing its cost. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] Figure 1 This is a flowchart illustrating a method for phase verification using surge arresters in a GIS substation, as provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a system for phase matching using surge arresters in a GIS substation, provided by an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] The method for phase verification using surge arresters in GIS substations, provided by the present invention, will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0022] Reference manual attached Figure 1 The diagram shows a flowchart of a method for phase verification using surge arresters in a GIS substation, provided by an embodiment of the present invention.

[0023] This invention provides a method for phase verification using surge arresters in a GIS substation system, which may include the following steps: S1: Acquire voltage signals from multiple low-voltage lines.

[0024] In one possible implementation, a voltage signal is obtained from a low-voltage line via capacitive coupling or induction.

[0025] In this embodiment of the invention, voltage signals are obtained from low-voltage lines using capacitive coupling or induction, without disassembling the GIS enclosed structure or directly contacting high-voltage lines. This avoids the risk of equipment damage, ensures operational safety, and can stably collect effective signals that are consistent with the phase of the busbar, avoiding the limitations of traditional contact sampling. At the same time, it supports phase verification while energized, without affecting the normal power supply of the grid, laying a reliable data foundation for subsequent accurate phase verification.

[0026] S2: Converts voltage signals into low-voltage signals through surge arresters and busbars.

[0027] In this embodiment of the invention, voltage signal conversion is achieved using the existing surge arresters and busbars of the GIS substation system, eliminating the need for additional complex conversion devices and making it suitable for applications in enclosed environments. The conversion process relies on the voltage division principle of the surge arrester resistor, accurately preserving signal characteristics consistent with the busbar phase while converting high-voltage signals into safe low-voltage signals. This avoids the risk of high-voltage contact, provides a stable and reliable foundation for subsequent signal processing, and does not interfere with the normal operation of the power grid.

[0028] S3: The low-voltage signal is digitally processed by the transmitter.

[0029] In this embodiment of the invention, digital signal processing of the low-voltage signal by the transmitter effectively filters out noise and interference, optimizes signal quality, and significantly improves the signal's anti-interference capability and stability. Simultaneously, the digitally processed signal is better suited to subsequent wireless transmission requirements, accurately retaining phase characteristics consistent with the bus, avoiding signal distortion from affecting phase comparison accuracy, and eliminating the need for additional independent processing equipment. This also adapts to the compact layout of a closed GIS environment, providing highly reliable data support for subsequent zero-crossing detection and phase difference calculation.

[0030] S4: The low-voltage signal after digital signal processing is filtered by a low-pass filter to obtain a filtered signal.

[0031] Specifically, the least mean square (LMS) or recursive least squares (RLS) adaptive algorithm can be used to construct an adaptive filter with a zero at the power frequency. The low-voltage signal after digital signal processing can be filtered through the adaptive filter to obtain the filtered signal.

[0032] S5: Calculate the phase difference of the filtered signal using a zero-crossing detection algorithm.

[0033] Specifically, the filtered signal undergoes preliminary processing to obtain discrete sampling points. To improve the accuracy of zero-crossing, linear interpolation is used to confirm the exact location of the zero-crossing. Simultaneously, to reduce random errors, multiple consecutive measurements are taken and averaged to calculate the phase difference of the filtered signal. By contacting the circuit under test at the top, the sine wave is converted into a square wave through signal conditioning and zero-crossing detection circuitry. Wireless synchronization technology is used to accurately measure the time difference between the zero-crossing moments of the two detection points. The phase difference is calculated using the formula: time difference / period × 360°, to determine whether the circuit phases are consistent.

[0034] In one possible implementation, S5 specifically includes sub-steps S501 to S504: S501: Performs zero-crossing detection on multiple filtered signals of the same frequency but different phases, and measures the corresponding zero-crossing times.

[0035] In one possible implementation, S501 specifically includes sub-steps S5011 to S5014: S5011: For multiple filtered signals with the same frequency but different phases, the signal-to-noise ratio, harmonic content, and amplitude stability of the signals are calculated through signal preprocessing and feature extraction.

[0036] S5012: Based on the signal-to-noise ratio, the harmonic content, and the amplitude stability, estimate the noise level and adaptively select the filtering parameters.

[0037] S5013: For multiple filtered signals with the same frequency but different phases, multiple zero-crossing positions can be detected by linear interpolation or higher-order interpolation methods.

[0038] Specifically, if x [ n ]≤0 and x [ n If +1]>0, then it is considered that in n and n There is a zero-crossing point between +1 and 0. To improve accuracy, linear interpolation or higher-order interpolation methods are used to determine the precise location of the zero-crossing point. The specific formula for linear interpolation is:

[0039] in, t zero Indicates the time past midnight. n Indicates the index of the sampling point. x Indicates the filtered signal. x [ n ] represents the first [number]th ... n The specific voltage amplitude corresponding to each sampling point x [ n+ 1] represents the first [number]th ... n+ The specific voltage amplitude corresponding to one sampling point.

[0040] It should be noted that using linear interpolation or higher-order interpolation methods to detect zero-crossing positions can accurately compensate for the inherent errors of discrete sampling, precisely locate the true zero-crossing points between sampling points, and effectively resist weak interference remaining after filtering. It adapts to different precision requirements, ensuring the stability of the basic scene while meeting high-precision phase comparison requirements through higher-order interpolation. This provides millimeter-level precise position data for subsequent phase difference calculations, significantly improving the reliability and consistency of phase comparison results in the GIS system.

[0041] S5014: Based on the noise level and the filtering parameters, detect multiple zero-crossing times corresponding to each of the zero-crossing positions.

[0042] It should be noted that the precise detection of the zero-crossing time corresponding to each zero-crossing point position converts the precise position information obtained by interpolation into quantified time data, ensuring the synchronization and comparability of the zero-crossing times of multiple lines.

[0043] In this embodiment of the invention, zero-crossing detection is performed on filtered signals of the same frequency but different phases. This accurately captures key nodes of signal phase transitions, effectively avoids weak interference remaining after filtering, and ensures the accuracy of zero-crossing time. This method is suitable for signal characteristics in phase comparison scenarios, providing accurate basic data for subsequent phase difference calculation based on time difference, ensuring the reliability of phase comparison results, and its simple operation logic is suitable for the signal processing needs of GIS systems.

[0044] S502: Calculate the time difference between each zero-crossing point.

[0045] Specifically, wireless synchronization technology is used to accurately measure the time difference between multiple zero-crossing points. The moment when the detected signal changes from a negative value to a positive value (zero-crossing point) is used to determine the phase difference by calculating the time difference between the zero-crossing points of two signals.

[0046] It should be noted that, building upon the zero-crossing time of the preceding precise detection, this method directly calculates the time differences, avoiding the discrete errors of independent time measurements and clearly quantifying the temporal correlation of multiple line phases. This provides a direct and comparable core quantitative basis for subsequent phase difference conversion, while also adapting to the pairwise comparison requirements of multi-line phase verification, reducing error propagation, and further solidifying the foundation for the phase verification accuracy of the GIS system.

[0047] S503: Obtain the frequency of the filtered signal.

[0048] It should be noted that accurately acquiring the frequency of the filtered signal and capturing the real-time frequency dynamics of the power grid provides reliable quantitative parameters for the core phase difference conversion formula, avoiding cascading errors caused by frequency deviations. This adapts to the minute fluctuations in the power grid frequency of the GIS system, ensuring the consistency of multi-cycle signal calculations, solidifying the key prerequisite for accurate phase difference conversion, and further improving the stability and adaptability of the phase difference verification results.

[0049] S504: Calculate the phase difference based on the time difference and frequency.

[0050] Specifically, the formula for calculating the phase difference is:

[0051]

[0052] in, Indicates phase difference, f Indicates the frequency of the filtered signal. π Represents pi (π). t Indicates the time difference past zero. t zero1 This indicates the zero-crossing time of line 1. t zero2 This indicates the zero-crossing time of line 2.

[0053] It should be noted that, relying on the accurately acquired time difference and frequency data, the core formula directly quantifies and converts time-series information into phase difference, avoiding the accumulation of errors from additional intermediate conversion steps. It adapts to the frequency fluctuation characteristics of GIS power grids, quickly outputting core phase verification indicators, providing direct and highly reliable quantitative evidence for subsequent phase consistency verification, and perfecting the logical closed loop of phase verification technology.

[0054] In this embodiment of the invention, a complete logical chain of "precise zero-crossing point positioning - time difference quantization - frequency capture - phase difference conversion" is employed, with each step seamlessly connected and errors controllable at each level. Adapting to the signal characteristics of a closed GIS environment, it avoids the superposition of errors from multiple stages by accurately extracting core parameters and directly quantifying and converting them. This efficiently outputs highly reliable key phase indicators, providing comprehensive and accurate technical support for phase consistency determination. Simultaneously, it is compatible with dynamic fluctuations in the power grid, ensuring the stability and reliability of energized phase comparisons.

[0055] In this embodiment of the invention, a zero-crossing detection algorithm is used to calculate the phase difference of the filtered signal, accurately adapting to the purity characteristics of the filtered signal, directly capturing the core phase correlation, and avoiding redundant processing steps. It can effectively resist residual interference in the closed environment of GIS, quickly quantify the phase differences of multiple lines, and provide a direct and accurate core basis for subsequent phase consistency determination. Simultaneously, it is adaptable to charged phase verification scenarios, ensuring detection efficiency and result reliability.

[0056] S6: Based on the phase difference, determine the consistency of the phase of each line.

[0057] In one possible implementation, S6 specifically includes sub-steps S601 and S602: S601: Calculate the average phase difference over multiple cycles.

[0058] It should be noted that by calculating the average of the phase differences over multiple cycles, the random errors and transient interference of a single measurement can be effectively offset, smoothing out minor signal fluctuations in a closed GIS environment. This enhances the robustness and consistency of the phase difference data, avoids accidental deviations from affecting the phase comparison conclusions, provides a more convincing quantitative basis for the final phase consistency determination, and further improves the accuracy and reliability of charged phase comparison.

[0059] S602: According to the phase determination standard of the power industry standard, determine whether the average value of the phase difference is less than a preset value; if so, the phases of each line are consistent; otherwise, the phases of each line are inconsistent.

[0060] For example, by sampling the signal from line 2, the phase value of the signal from line 2 is obtained, and the phase difference is calculated. According to the DLT971-2017 power industry standard's phase determination standard (Level A), when the phase difference is less than a preset value, the phases of all lines are considered consistent. Phase measurements (samples) of each line are collected over a certain period, and a one-way ANOVA is performed on the phase samples from multiple lines. The p-value is used for determination: if the p-value is less than the significance level, the null hypothesis is rejected (the phases of all lines are considered consistent), i.e., inconsistent; otherwise, they are considered consistent. Considering the distribution characteristics of the measured values ​​avoids the limitations of a single threshold.

[0061] It should be noted that those skilled in the art can set preset values ​​according to actual needs, and this invention does not limit such settings.

[0062] It should be noted that using the average of multiple cycle phase differences as the core criterion avoids the interference of accidental fluctuations in a single measurement, making the phase consistency judgment more objective and convincing. It directly addresses the core objective of phase matching, clearly outputting the line phase matching results, adapting to the actual operational needs of GIS energized phase matching, and providing accurate and reliable decision support for safe grid connection or wiring.

[0063] S7: The phase difference of each of the filtered signals is transmitted to the monitoring center via the GC433 wireless module.

[0064] In this embodiment of the invention, the GC433 wireless module is selected to transmit the phase difference of each filtered signal, accurately adapting to the enclosed environment of GIS and electromagnetic interference scenarios of power equipment, and enabling stable long-distance transmission. It ensures that the phase determination results are delivered to the monitoring center in real time without distortion, without the need for additional cabling, and is compatible with compact equipment layouts, providing efficient and convenient transmission support for maintenance personnel to quickly grasp the phase status and timely manage power grid safety.

[0065] The method for phase verification using surge arresters in a GIS substation provided in this application can be executed by a device for phase verification using surge arresters in a GIS substation. This application uses the device for phase verification using surge arresters in a GIS substation as an example to illustrate the device for phase verification using surge arresters in a GIS substation provided in this application.

[0066] Reference manual attached Figure 2 The diagram shows a structural schematic of a system for phase matching using surge arresters in a GIS substation, provided by an embodiment of the present invention.

[0067] This invention provides a system 20 for phase matching using surge arresters in a GIS substation, comprising: a processor 201 and a memory 202; The memory 202 stores programs or instructions that can run on the processor 201. When the program or instructions are executed by the processor 201, they implement the steps of the above-described method for phase verification using surge arresters in GIS substations and achieve the same technical effect. To avoid repetition, the present invention will not elaborate further.

[0068] It should be understood that the processor 201 in this embodiment of the invention may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), 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.

[0069] It should also be understood that the memory 202 in the embodiments of the present invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM).

[0070] The above embodiments can be implemented, in whole or in part, by software, hardware (such as circuits), firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0071] It should be understood that, in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0072] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0073] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0074] In the several embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0075] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0076] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0077] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0078] This invention provides a readable storage medium comprising: storing a program or instructions on the readable storage medium, wherein when the program or instructions are executed by a processor, the program or instructions implement the steps of the above-described method for phase verification using surge arresters in a GIS substation, and achieve the same technical effect. To avoid repetition, this invention will not elaborate further.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A method for phase verification using surge arresters in a GIS substation, characterized in that, include: S1: Acquire voltage signals from multiple low-voltage lines; S2: The voltage signal is converted into a low-voltage signal through the surge arrester and busbar; S3: The low-voltage signal is digitally processed by the transmitter; S4: The low-voltage signal after digital signal processing is filtered by a low-pass filter to obtain a filtered signal; S5: Calculate the phase difference of the filtered signal using a zero-crossing detection algorithm; S6: Based on the phase difference, determine the consistency of the phase of each of the lines; S7: The phase difference of each of the filtered signals is transmitted to the monitoring center via the GC433 wireless module.

2. The method for phase verification using surge arresters in a GIS substation according to claim 1, characterized in that, S1 specifically refers to obtaining a voltage signal from a low-voltage line through capacitive coupling or induction.

3. The method for phase verification using surge arresters in a GIS substation according to claim 1, characterized in that, S5 specifically includes: S501: Zero-crossing detection is performed on multiple filtered signals of the same frequency but different phases to measure the corresponding multiple zero-crossing times; S502: Calculate the time difference of each of the zero-crossing times; S503: Obtain the frequency of the filtered signal; S504: Calculate the phase difference based on the time difference and the frequency.

4. The method for phase verification using surge arresters in a GIS substation according to claim 3, characterized in that, S501 specifically includes: S5011: For multiple filtered signals with the same frequency but different phases, the signal-to-noise ratio, harmonic content, and amplitude stability of the signals are calculated through signal preprocessing and feature extraction. S5012: Estimate the noise level and adaptively select filter parameters based on the signal-to-noise ratio, the harmonic content, and the amplitude stability; S5013: For multiple filtered signals of the same frequency but different phases, multiple zero-crossing positions can be detected by linear interpolation or higher-order interpolation methods; S5014: Based on the noise level and the filtering parameters, detect multiple zero-crossing times corresponding to each of the zero-crossing positions.

5. The method for phase verification using surge arresters in a GIS substation according to claim 4, characterized in that, The specific formula for the linear interpolation is as follows: ； in, t zero Indicates the time past midnight. n Indicates the index of the sampling point. x Indicates the filtered signal. x [ n ] represents the first [number]th ... n The specific voltage amplitude corresponding to each sampling point x [ n+ 1] represents the first [number]th ... n+ The specific voltage amplitude corresponding to one sampling point.

6. The method for phase verification using surge arresters in a GIS substation according to claim 3, characterized in that, Specifically, S502 involves using wireless synchronization technology to accurately measure the time difference between multiple zero-crossing points.

7. The method for phase verification using surge arresters in a GIS substation according to claim 3, characterized in that, The formula for calculating the phase difference is: ； ； in, Indicates phase difference, f Indicates the frequency of the filtered signal. π Represents pi (π). t Indicates the time difference past zero. t zero1 This indicates the zero-crossing time of line 1. t zero2 This indicates the zero-crossing time of line 2.

8. The method for phase verification using surge arresters in a GIS substation according to claim 1, characterized in that, S6 specifically includes: S601: Calculate the average value of the phase difference over multiple cycles; S602: Determine whether the average value of the phase difference is less than a preset value; if so, the phases of each line are consistent; otherwise, the phases of each line are inconsistent.

9. A system for phase verification using surge arresters in a GIS substation, characterized in that, include: Processor and memory; The memory stores programs or instructions that can run on the processor, which, when executed by the processor, implement the steps of the method for phase verification using surge arresters in a GIS substation as described in any one of claims 1 to 8.

10. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method for phase verification using surge arresters in a GIS substation as described in any one of claims 1 to 8.

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