GIS tank body induced voltage and current feature identification method

Abstract

The invention provides a GIS tank induced voltage and current feature identification method, which comprises the following steps: performing electrical performance detection on a current transformer and a voltage transformer in GIS equipment, and acquiring induced current and induced voltage in real time; performing data analysis on the induced current and the induced voltage, extracting features, and obtaining an induced voltage and current waveform; the method comprises the following steps: acquiring data acquired by a current transformer and a voltage transformer in a GIS tank body in real time, performing time domain and frequency domain analysis on induced current and induced voltage in real time, performing feature extraction on the voltage and current waveforms, and generating corresponding measures. And the fault type of the corresponding waveform is matched and searched, and finally a specific fault event is analyzed, so that the fault condition and the fault position can be known at the first time when the GIS tank body has a fault, the equipment at the fault position is maintained, and the stability and the safety of the whole power system are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of discharge detection, and in particular to a method for identifying induced voltage and current characteristics of a GIS tank. Background Art

[0002] State Grid Corporation of China has a large and complex power system. As one of the most important power equipment in the power grid, GIS equipment (Gas Insulated Switchgear) plays a vital role and its operation stability and safety are of vital importance. The operation of GIS is directly related to the safety of the entire power system, and the occurrence of GIS failures and accidents must be prevented and reduced to the greatest extent possible. However, since GIS equipment cannot directly obtain equipment failure information, mechanical transmission failure and electrical interlock failure of GIS equipment may lead to serious equipment misoperation failures, affecting the stability and safety of the entire power system. Therefore, the safety issue in GIS equipment operation is still a challenge that needs to be solved urgently. Only by quickly identifying GIS equipment failures can the safety and stability of GIS equipment operation be guaranteed, and then the safe operation of the entire power system can be guaranteed.

[0003] The existing GIS tank is filled with SF6 insulating gas, and its metal shell is usually made of aluminum alloy sheets rolled and welded. When the electromagnetic field changes inside the GIS equipment, such as switch operation, partial discharge, etc., induced voltage and induced current will be generated on the metal shell of the tank. The magnitude, direction, frequency and other characteristics of these induced voltage and induced current are related to the electromagnetic field distribution inside the GIS equipment, the type of switch operation, the intensity of partial discharge and other factors. In GIS equipment, current transformers (CT) and voltage transformers (PT) are key components for measuring current and voltage signals. When current passes through the GIS bus, voltage and current will be induced on the tank. The magnitude, phase and waveform of these induced voltage and current are closely related to the operating status and fault conditions of the GIS equipment. Therefore, a method for identifying the induced voltage and current characteristics of the GIS tank is urgently needed to solve the problem that the existing GIS equipment cannot directly obtain equipment fault information, affecting the stability and safety of the entire power system. Summary of the invention

[0004] The purpose of the present invention is to provide a method for identifying the characteristics of induced voltage and current of a GIS tank, aiming to solve the problem that the existing GIS equipment directly obtains equipment fault information, affecting the stability and safety of the entire power system.

[0005] To achieve the above object, the present invention provides a method for identifying the induced voltage and current characteristics of a GIS tank, comprising the following steps:

[0006] S1. Conduct electrical performance tests on current transformers and voltage transformers in GIS equipment, and collect induced current and induced voltage information in real time;

[0007] S2. Perform data analysis on the real-time collected induced current and induced voltage information, extract features, and obtain induced voltage and induced current waveforms;

[0008] S3. Match the acquired induced voltage and induced current waveforms accordingly, identify corresponding waveforms, analyze corresponding faults and potential risks, and generate corresponding measures.

[0009] The specific method of step S1 includes the following steps:

[0010] S11. Measure the transformation ratio, DC resistance and excitation characteristics of the current transformer and voltage transformer, and compare them with the standard values ​​to verify whether the current transformer and voltage transformer are normal;

[0011] S12. Measure the insulation resistance between the secondary winding and the housing and between the secondary winding;

[0012] S13. Perform a pressure test on the GIS tank to verify the ability of the GIS tank to withstand voltage;

[0013] Based on the current transformer and the voltage transformer in the above steps, the induced current and the induced voltage are collected in real time.

[0014] During the real-time collection of the induced current and the induced voltage, interference suppression measures are taken, and the interference suppression measures include filtering and shielding.

[0015] The specific method of step S2 includes the following steps:

[0016] S21. Performing time domain analysis and frequency domain analysis on the induced current and the induced voltage to obtain analysis information;

[0017] S22. Perform feature extraction on the analysis information based on a deep learning algorithm to obtain voltage and current waveforms.

[0018] The information on the waveform, amplitude and frequency of the induced voltage and the induced current is obtained according to the time domain analysis.

[0019] The frequency spectrum distribution and harmonic component information of the induced voltage and the induced current are obtained according to the frequency domain analysis.

[0020] The specific method of step S3 comprises the following steps:

[0021] S31. Perform similarity matching on the induced voltage and induced current waveforms with waveforms in a known waveform library to identify corresponding waveforms;

[0022] S32. Find the corresponding fault type based on the corresponding waveform and analyze the corresponding fault or event;

[0023] S33. Based on the corresponding fault analysis potential risks, early warning and recording, and automatically generate corresponding measures;

[0024] S34. Repair or replace the GIS tank based on the corresponding measures.

[0025] The invention discloses a method for identifying the characteristics of induced voltage and current of a GIS tank, comprising: performing electrical performance detection on a current transformer and a voltage transformer in a GIS device, utilizing the characteristics of the GIS tank, that is, when current passes through a GIS busbar, voltage and current are induced on the tank, identifying the characteristics through this, and collecting the detected induced current and induced voltage in real time; performing data analysis on the induced current and the induced voltage, extracting characteristics, and obtaining induced voltage and current waveforms; matching the induced voltage and current waveforms, identifying corresponding waveforms, analyzing corresponding faults and potential risks, and generating corresponding measures. The method collects data collected by the current transformer and the voltage transformer in the GIS tank in real time, performs time domain and frequency domain analysis on the induced current and the induced voltage in real time, extracts characteristics of the voltage and current waveforms, matches and searches for the fault type of the corresponding waveform, and finally analyzes the specific fault event. The fault condition and the fault location can be known at the first time when the GIS tank fails, so that the equipment at the fault location can be maintained at the first time, thereby ensuring the stability and safety of the entire power system, effectively preventing the operational risks that may be caused by mechanical transmission failure and electrical interlock failure, and reducing the risk of equipment failure caused by human factors. Through accurate operation effectiveness identification and early warning methods, operation anomalies can be discovered in time, which not only reduces equipment loss and maintenance costs, but also improves the life and stability of equipment, making the operation of the power system more reliable, reducing the probability of power outages, improving the continuity of power supply, ensuring the user's electricity needs, and solving the problem that existing GIS equipment cannot directly obtain equipment fault information, affecting the stability and safety of the entire power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention provides a flow chart of a method for identifying GIS tank induced voltage and current characteristics.

[0027] Figure 2 It is a flow chart of the specific method for testing the electrical performance of the current transformer and voltage transformer in the GIS equipment and collecting the induced current and induced voltage in real time.

[0028] Figure 3It is a flow chart of a specific method for performing data analysis on the induced current and the induced voltage, extracting features, and obtaining induced voltage and current waveforms.

[0029] Figure 4 It is a flowchart of a specific method of matching the induced voltage and current waveforms, identifying corresponding waveforms, and analyzing corresponding faults. DETAILED DESCRIPTION

[0030] See also Figures 1 to 4 , these four figures provide the overall flow chart of a method for identifying the induced voltage and current characteristics of a GIS tank body proposed by the present invention. The method comprises the following steps:

[0031] S1. Conduct electrical performance testing on current transformers and voltage transformers in GIS equipment, and collect induced current and induced voltage in real time; S2. Perform data analysis on the induced current and induced voltage information collected in real time, extract features, and obtain induced voltage and induced current waveforms; S3. Perform corresponding matching on the obtained induced voltage and induced current waveforms, identify corresponding waveforms, analyze corresponding faults and potential risks, and generate corresponding measures.

[0032] The specific method of step S1 includes the following steps:

[0033] S11. Measure the transformation ratio, DC resistance and excitation characteristics of the current transformer and voltage transformer, and compare them with the standard values ​​to verify whether the current transformer and voltage transformer are normal;

[0034] S12. Measure the insulation resistance between the secondary winding and the housing and between the secondary winding;

[0035] S13. Perform a pressure test on the GIS tank to verify the ability of the GIS tank to withstand voltage;

[0036] S14. Collecting induced current and induced voltage in real time based on the current transformer and the voltage transformer.

[0037] In the embodiment of the present invention, high-precision measuring instruments, such as digital voltmeters and ammeters, are used to measure the induced voltage and current on the GIS tank, and characteristic information such as the waveform, phase, and amplitude of the voltage and current are recorded. In practical applications, the induced voltage and current signals emitted by the GIS tank may be affected by external interference. Therefore, in the process of real-time acquisition of induced current and induced voltage, interference suppression measures, including filtering and shielding, need to be taken to improve the reliability of subsequent identification results.

[0038] The specific method of step S2 includes the following steps:

[0039] S21. Performing time domain analysis and frequency domain analysis on the induced current and the induced voltage to obtain analysis information;

[0040] In an embodiment of the present invention, by measuring the changes of induced voltage and induced current over time, their time domain characteristics can be obtained. Time domain analysis can reveal key information such as the waveform, amplitude, frequency, etc. of the induced voltage and current. For example, in the identification of transmission line faults, the induced voltage characteristics of short-circuit faults generally have transient, large amplitude and wide bandwidth, and time domain analysis can be used to obtain these characteristics; during the operation of GIS switches, transient changes of induced voltage and current can be observed, and these characteristics can be extracted through time domain analysis.

[0041] By performing Fourier transform on the induced voltage and current signals, their frequency domain characteristics can be obtained. Frequency domain analysis can reveal information such as the spectrum distribution and harmonic components of the induced voltage and current. For example, in GIS partial discharge detection, the UHF method uses the UHF electromagnetic wave signal radiated by GIS partial discharge for detection, and partial discharge can be identified by analyzing the frequency domain characteristics.

[0042] S22. Perform feature extraction on the analysis information based on a deep learning algorithm to obtain voltage and current waveforms.

[0043] In an embodiment of the present invention, the features extracted from the analysis information can be classified and identified through machine learning or deep learning algorithms. For example, in the identification of transmission line faults, the corresponding feature extraction and classification methods can be used to implement fault identification based on the induced voltage characteristics of different types of faults such as short circuit, grounding, overload, etc.

[0044] The specific methods of step S3 include:

[0045] 31. Perform similarity matching between the induced voltage and current waveforms and the waveforms in the known waveform library to identify the corresponding waveforms;

[0046] In an embodiment of the present invention, the induced voltage and current waveforms are matched for similarity with waveforms in a known waveform library, and the corresponding fault or event type is identified through comparative measurement. The known waveform library is established through waveforms of previous GIS equipment faults.

[0047] S32. Find the corresponding fault type based on the corresponding waveform and analyze the corresponding fault or event;

[0048] In the embodiment of the present invention, the corresponding fault or event with the highest similarity is analyzed and searched according to the identified corresponding fault or event type.

[0049] S33. Based on the corresponding fault analysis potential risks, early warning and recording, and automatically generate corresponding measures;

[0050] In an embodiment of the present invention, after analyzing the potential risks, the analysis is sent to the management end to inform the administrator of the potential risks, and corresponding measures are automatically generated. The corresponding measures are automatically generated according to the different potential risks and fault events, and there is no need for maintenance personnel to check the faults and countermeasures on site.

[0051] S34. Repair or replace the GIS tank based on the corresponding measures.

[0052] The invention proposes a GIS tank induced voltage and current feature recognition method, which performs electrical performance detection on current transformers and voltage transformers in GIS equipment, and utilizes the characteristics of the GIS tank, that is, when current passes through the GIS bus, voltage and current will be induced on the tank, and through this feature recognition, the induced current and induced voltage are collected in real time; data analysis is performed on the induced current and the induced voltage, features are extracted, and induced voltage and current waveforms are obtained; the induced voltage and current waveforms are matched, the corresponding waveforms are identified, and corresponding faults and potential risks are analyzed, and corresponding measures are generated. The method collects data collected by the current transformer and the voltage transformer in the GIS tank in real time, performs time domain and frequency domain analysis on the induced current and the induced voltage in real time, extracts features of the voltage and current waveforms, matches and searches for the fault type of the corresponding waveform, and finally analyzes the specific fault event. The fault situation and fault location can be known at the first time when the GIS tank fails, so that the equipment at the fault location can be maintained at the first time, ensuring the stability and safety of the entire power system, effectively preventing the operational risks that may be caused by mechanical transmission failure and electrical interlock failure, and reducing the risk of equipment failure caused by human factors. Through accurate operation effectiveness identification and early warning methods, operation anomalies can be discovered in time, which not only reduces equipment loss and maintenance costs, but also improves the life and stability of equipment, makes the operation of the power system more reliable, reduces the probability of power outages, improves the continuity of power supply, ensures the user's electricity needs, and solves the problem of existing GIS equipment directly obtaining equipment fault information, affecting the stability and safety of the entire power system.

[0053] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for identifying the induced voltage and current characteristics of a GIS tank, characterized in that: The following steps are involved: S1. Conduct electrical performance tests on current transformers and voltage transformers in GIS equipment, and collect induced current and induced voltage information in real time; S2. Perform data analysis on the real-time collected induced current and induced voltage information, extract features, and obtain induced voltage and induced current waveforms; S3. Match the acquired induced voltage and induced current waveforms accordingly, identify corresponding waveforms, analyze corresponding faults and potential risks, and generate corresponding measures.

2. The GIS tank induced voltage and current feature recognition method according to claim 1 is characterized in that: The specific method of step S1 includes: S11. Measure the transformation ratio, DC resistance and excitation characteristics of the current transformer and voltage transformer, and compare them with the standard values ​​to verify whether the current transformer and voltage transformer are normal; S12. Measure the insulation resistance between the secondary winding and the housing and between the secondary winding; S13. Perform a pressure test on the GIS tank to verify the ability of the GIS tank to withstand voltage; Based on the current transformer and the voltage transformer in the above steps, the induced current and the induced voltage are collected in real time.

3. The GIS tank induced voltage and current feature recognition method according to claim 2 is characterized in that: During the real-time collection of the induced current and the induced voltage, interference suppression measures are taken, and the interference suppression measures include filtering and shielding.

4. The GIS tank induced voltage and current feature recognition method according to claim 1 is characterized in that: The specific method of step S2 includes the following steps: S21. Performing time domain analysis and frequency domain analysis on the induced current and the induced voltage to obtain analysis information; S22. Perform feature extraction on the analysis information based on a deep learning algorithm to obtain voltage and current waveforms.

5. The GIS tank induced voltage and current feature recognition method according to claim 4 is characterized in that: The information on the waveform, amplitude and frequency of the induced voltage and the induced current is obtained according to the time domain analysis.

6. The GIS tank induced voltage and current feature recognition method according to claim 4, characterized in that: The frequency spectrum distribution and harmonic component information of the induced voltage and the induced current are obtained according to the frequency domain analysis.

7. The GIS tank induced voltage and current feature recognition method according to claim 1, characterized in that: The specific method of step S3 includes the following steps: S31. Perform similarity matching on the induced voltage and induced current waveforms with waveforms in a known waveform library to identify corresponding waveforms; S32. Find the corresponding fault type based on the corresponding waveform and analyze the corresponding fault or event; S33. Based on the corresponding fault analysis potential risks, early warning and recording, and automatically generate corresponding measures; S34. Repair or replace the GIS tank based on the corresponding measures.

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