GIS equipment distributed mechanical state evaluation method based on circuit breaker action

Abstract

The invention discloses a GIS equipment distributed mechanical state evaluation method based on circuit breaker action. The method comprises the following steps: S1, constructing a distributed sensor network; s2, signal acquisition; s3, signal preprocessing; s4, extracting state characteristic parameters; and S5, performing state evaluation: performing distributed mechanical state evaluation on the GIS equipment according to the extracted state characteristic parameters of each vibration measurement point in combination with a preset mechanical state evaluation standard.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power operation and maintenance, and in particular to a distributed mechanical state evaluation method of GIS equipment based on circuit breaker action. Background Art

[0002] With the construction of ultra-high and extra-high voltage power grids, the demand for power system capacity and energy continues to increase, and higher and higher requirements are also put forward for the reliability and economy of power systems. Gas-insulated fully enclosed switchgear (GIS) is a widely used high-voltage switchgear in today's power transmission network. Compared with traditional open equipment, GIS has the advantages of small footprint, high reliability and strong environmental compatibility, so it is widely used in important loads and hub substations. Because GIS equipment adopts a full metal enclosed structure, its internal mechanical structure is relatively complex and large, and its operating environment is harsh, it is prone to mechanical failure or performance degradation. Once a failure occurs, the impact range is large and it is difficult to accurately locate and quickly repair, affecting the commissioning of equipment after the failure. Its operating status directly affects the safety and stability of the power system, so regular inspection and maintenance are required. In the prior art, the evaluation of the mechanical state of GIS equipment mainly relies on the judgment of the operator based on personal experience during regular inspections. It is highly dependent on the experience of the operator and is highly subjective. It is difficult to find the potential failure problems of GIS equipment in the early stage. Therefore, it is urgent to develop a method that can objectively and accurately evaluate the mechanical state of GIS. Summary of the invention

[0003] In view of this, it is necessary to provide a distributed mechanical state evaluation method for GIS equipment based on circuit breaker action, which can objectively and accurately evaluate the mechanical state of GIS.

[0004] A method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action includes the following steps:

[0005] S1. Distributed sensor network construction, including:

[0006] S10, setting an acceleration sensor for collecting excitation signals on the surface of the GIS circuit breaker housing;

[0007] S11. Vibration measuring points are respectively set on the insulating basin of the GIS circuit breaker, the surface and insulating basin of the CT housing, the surface and insulating basin of the PT housing, the surface and insulating basin of the busbar housing, and the operating mechanism, and an acceleration sensor for collecting vibration response signals is set at each vibration measuring point;

[0008] S2. Signal acquisition, including:

[0009] S20, triggering and collecting data through an acceleration sensor arranged on the surface of the GIS circuit breaker housing to obtain the original transient vibration excitation signal x when the circuit breaker is in action ′ (t);

[0010] S21, using the acceleration sensors set at each vibration measuring point to synchronously collect data, and obtain the original vibration response signal y of each vibration measuring point after the circuit breaker is actuated n ′ (t), n = 1, 2..., n is the number of each vibration measurement point;

[0011] S3. Signal preprocessing:

[0012] For the original transient vibration excitation signal x ′ (t) and the original vibration response signal y n ′ (t) Perform filtering, denoising and normalization preprocessing respectively to obtain the transient vibration excitation signal x(t) and the vibration response signal y of each vibration measurement point n (t);

[0013] S4. Extraction of state characteristic parameters, including:

[0014] S40, based on the transient vibration excitation signal x(t) and the vibration response signal y of each vibration measurement point n (t), obtain the frequency response function H of each vibration measurement point n (f);

[0015] S41, according to the frequency response function H of each vibration measurement point n (f) Obtain the amplitude-frequency characteristic curve of the frequency response function within 0-20kHz at each vibration measurement point |H n (f)|;

[0016] S42, according to the amplitude-frequency characteristic curve of each vibration measurement point |H n (f)|, obtain the correlation coefficient R between the current mechanical state signal of each vibration measurement point and the reference benchmark signal in the low frequency band nLF , correlation coefficient R in the mid-frequency band nMF , and the correlation coefficient R in the high frequency band nHF , as the state characteristic parameter of each vibration measuring point;

[0017] S5. Status evaluation:

[0018] According to the extracted state characteristic parameters of each vibration measuring point and combined with the preset mechanical state evaluation standard, the distributed mechanical state evaluation of GIS equipment is carried out.

[0019] Preferably, in step S5, the preset mechanical state evaluation standard is as follows:

[0020] When the R nLF When <0.7, it is determined that the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment has a serious mechanical failure;

[0021] When 0.7≤R nLF <0.8, or R nMF When <0.8, the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment is judged to be a slight mechanical failure;

[0022] When 0.8≤R nLF <0.9 or 0.8≤R nMF When <0.9, the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment is judged to be a suspected mechanical failure;

[0023] When 0.9≤R nLF ≤1 and 0.9≤R nMF and 0.8≤R nHF At this time, the mechanical state of the internal structure of the GIS equipment corresponding to this vibration measuring point is determined to be normal.

[0024] Preferably, when the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is determined to be a serious mechanical failure, it needs to be shut down immediately;

[0025] When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a minor mechanical failure, a comprehensive analysis is required;

[0026] When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a suspected mechanical failure, enhanced monitoring is required.

[0027] Preferably, in step S42, the correlation coefficient R nLF , R nMF , R nHF The steps to obtain are as follows:

[0028] S420, record the amplitude-frequency characteristic curve of each vibration measurement point obtained when the circuit breaker is operated for the first time during the installation and commissioning of GIS equipment or after a certain maintenance as the reference reference signal | H n (f)| ref , record the amplitude-frequency characteristic curve of each vibration measurement point obtained after the current circuit breaker action|H n (f) | is the current mechanical state signal;

[0029] S421. According to formula (1), the correlation coefficient R between the current mechanical state signal of each vibration measurement point of the GIS equipment and the reference reference signal in the low frequency band is calculated respectively. nLF , correlation coefficient R in the mid-frequency band nMF , and the correlation coefficient R in the high frequency bandnHF , where Cov(|H n (f)| ref ,|H n (f)|) is the covariance between the current mechanical state signal of each vibration measurement point and the reference reference signal, Var(|H n (f)| ref ) is the covariance of the reference signal of each vibration measurement point, Var(|H n (f)|) is the covariance of the current mechanical state signal of each vibration measurement point.

[0030]

[0031] Preferably, in step S420, if the GIS device has no historical data as a reference, the amplitude-frequency characteristic curve of each vibration measurement point obtained when the circuit breaker is first operated during the installation and commissioning of the same model of GIS equipment at the same station or after a certain maintenance is selected as the reference reference signal |H n (f)| ref .

[0032] Preferably, in step S42, the low frequency band is 0-1 kHz; the middle frequency band is 1 k-5 kHZ; and the high frequency band is 5 k-20 kHz.

[0033] Preferably, in step S40, the frequency response function H of each vibration measurement point is n (f) is calculated by formula (2), where G xyn (f) is x(t) and y n The cross power spectral density function of (t), G xx (f) is the auto-power spectral density function of x(t), H Rn (f) and H τn (f) are the real and imaginary parts of the frequency response function of each vibration measurement point.

[0034] H n (f) = G xyn (f) / G xx (f) = H Rn (f)+i×H τn (f) Formula (2)

[0035] In this embodiment, the frequency response function of each vibration measuring point is calculated using the H1 method of the frequency response function.

[0036] Preferably, in step S41, the amplitude-frequency characteristic curve of the frequency response function within 0-20kHz of each vibration measurement point |H n (f)|, calculated by formula (3), where H Rn (f) and H τn (f) are the real and imaginary parts of the frequency response function of each vibration measurement point.

[0037]

[0038] The above-mentioned distributed mechanical state evaluation method of GIS equipment based on circuit breaker action, by setting an acceleration sensor for collecting excitation signals on the surface of the GIS circuit breaker shell, and setting multiple vibration measuring points at key positions around the circuit breaker, and arranging acceleration sensors at each vibration measuring point to form a distributed sensor network, can collect the transient vibration excitation signal when the GIS circuit breaker is in action and the vibration response signal of each vibration measuring point, and then extract the amplitude-frequency characteristic curve at each vibration measuring point from the transient vibration excitation signal and the vibration response signal, take it as the current mechanical state, and compare it with the reference benchmark signal, so as to obtain the amplitude-frequency characteristic curve at each vibration measuring point that can reflect the mechanical state of the GIS equipment. The state characteristic parameters of the mechanical state are obtained, and then the distributed mechanical state evaluation of the GIS equipment is performed according to the evaluation criteria; compared with the method in the prior art in which operators make judgments based on observation and personal experience, on the one hand, the present invention is more objective and accurate in evaluating the mechanical state of GIS equipment, and can provide decision support for preventive maintenance and fault handling of GIS equipment, which is helpful to extend the life of GIS equipment and improve the safety of power operation and maintenance; on the other hand, because multiple vibration measuring points are set, the mechanical state of the internal structure corresponding to each vibration measuring point of the GIS equipment can be evaluated more accurately, and the fault location is more accurate and comprehensive, which provides strong support for subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0040] The technical solutions and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0041] Please see Figure 1 As shown, a method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action includes the following steps:

[0042] S1. Distributed sensor network construction, including:

[0043] S10, setting an acceleration sensor for collecting excitation signals on the surface of the GIS circuit breaker housing;

[0044] S11. Vibration measuring points are respectively set on the insulating basin of the GIS circuit breaker, the surface and insulating basin of the CT housing, the surface and insulating basin of the PT housing, the surface and insulating basin of the busbar housing, and the operating mechanism, and an acceleration sensor for collecting vibration response signals is set at each vibration measuring point;

[0045] S2. Signal acquisition, including:

[0046] S20, triggering and collecting data through an acceleration sensor arranged on the surface of the GIS circuit breaker housing to obtain the original transient vibration excitation signal x when the circuit breaker is in action ′ (t);

[0047] S21, using the acceleration sensors set at each vibration measuring point to synchronously collect data and obtain the original vibration response signal y of each vibration measuring point after the circuit breaker is actuated n ′ (t), n = 1, 2..., n is the number of each vibration measurement point;

[0048] S3. Signal preprocessing:

[0049] For the original transient vibration excitation signal x ′ (t) and the original vibration response signal y n ′ (t) Perform filtering, denoising and normalization preprocessing respectively to obtain the transient vibration excitation signal x(t) and the vibration response signal y of each vibration measurement point n (t);

[0050] S4. Extraction of state characteristic parameters, including:

[0051] S40, based on the transient vibration excitation signal x(t) and the vibration response signal y of each vibration measurement point n (t), obtain the frequency response function H of each vibration measurement point n (f);

[0052] S41, according to the frequency response function H of each vibration measurement point n (f) Obtain the amplitude-frequency characteristic curve of the frequency response function within 0-20kHz at each vibration measurement point |H n (f)|;

[0053] S42, according to the amplitude-frequency characteristic curve of each vibration measurement point |H n (f)|, obtain the correlation coefficient R between the current mechanical state signal of each vibration measurement point and the reference benchmark signal in the low frequency band nLF , correlation coefficient R in the mid-frequency band nMF , and the correlation coefficient R in the high frequency band nHF , as the state characteristic parameter of each vibration measuring point;

[0054] S5. Status evaluation:

[0055] According to the extracted state characteristic parameters of each vibration measuring point and combined with the preset mechanical state evaluation standard, the distributed mechanical state evaluation of GIS equipment is carried out.

[0056] In this embodiment, the acceleration sensor is a high-precision acceleration sensor; vibration measuring points are respectively set at key positions around the GIS circuit breaker, namely, the insulating basin of the GIS circuit breaker, the surface and insulating basin of the CT shell, the surface and insulating basin of the PT shell, the surface and insulating basin of the busbar shell, and the operating mechanism, and acceleration sensors are set at each vibration measuring point, so that the vibration of all key parts of the GIS caused by the operation of the circuit breaker can be measured. In this way, the vibration response information obtained is more accurate, rich and comprehensive, which provides an information source for subsequent more accurate and comprehensive judgment of the mechanical state of the GIS equipment.

[0057] Furthermore, in step S5, the preset mechanical state evaluation criteria are as follows:

[0058] When the R nLF When <0.7, it is determined that the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment has a serious mechanical failure;

[0059] When 0.7≤R nLF <0.8, or R nMF When <0.8, the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment is judged to be a slight mechanical failure;

[0060] When 0.8≤R nLF <0.9 or 0.8≤R nMF When <0.9, the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment is judged to be a suspected mechanical failure;

[0061] When 0.9≤R nLF ≤1 and 0.9≤R nMF and 0.8≤R nHF At this time, it is determined that the mechanical state of the internal structure of the GIS equipment corresponding to this vibration measuring point is normal.

[0062] In this embodiment, the correlation coefficient R of each vibration measurement point is calculated by the above evaluation criteria. nLF , R nMF , R nHF By making comparisons, the mechanical states of the internal structures of the GIS equipment corresponding to each vibration measurement point are obtained, thus realizing an accurate and objective distributed evaluation of the mechanical states of the internal structures of the GIS equipment.

[0063] For example, when the vibration measurement point is set at the insulating basin of the circuit breaker, the corresponding correlation coefficient R nLF <0.7, it is determined that the mechanical state of the GIS equipment circuit breaker has a serious mechanical fault; when the vibration measurement point is set on the surface of the CT shell, the corresponding correlation coefficient is 0.7≤R nLF <0.8, or R nMF<0.8, it is determined that the mechanical state of the GIS equipment CT has a slight mechanical fault; when the vibration measurement point is set on the CT insulation basin, the corresponding correlation coefficient R nLF When <0.7, it is determined that the mechanical state of the CT or disconnector closest to the vibration measuring point in the GIS equipment has a serious mechanical fault. The specific fault is in which of the above two parts, and it is determined when the operation needs to be stopped.

[0064] Furthermore, when the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is determined to be a serious mechanical failure, it needs to be shut down immediately;

[0065] When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a minor mechanical failure, a comprehensive analysis is required;

[0066] When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a suspected mechanical failure, enhanced monitoring is required.

[0067] Furthermore, in step S42, the correlation coefficient R nLF , R nMF , R nHF The steps to obtain are as follows:

[0068] S420, record the amplitude-frequency characteristic curve of each vibration measurement point obtained when the circuit breaker is operated for the first time during the installation and commissioning of GIS equipment or after a certain maintenance as the reference reference signal | H n (f)| ref , record the amplitude-frequency characteristic curve of each vibration measurement point obtained after the current circuit breaker action|H n (f) | is the current mechanical state signal;

[0069] S421. According to formula (1), the correlation coefficient R between the current mechanical state signal of each vibration measurement point of the GIS equipment and the reference reference signal in the low frequency band is calculated respectively. nLF , correlation coefficient R in the mid-frequency band nMF , and the correlation coefficient R in the high frequency band nHF , where Cov(|H n (f)| ref ,|H n (f)|) is the covariance between the current mechanical state signal of each vibration measurement point and the reference reference signal, Var(|H n (f)| ref ) is the covariance of the reference signal of each vibration measurement point, Var(|H n (f)|) is the covariance of the current mechanical state signal of each vibration measurement point.

[0070]

[0071] Furthermore, in step S420, if the GIS device has no historical data as a reference, the amplitude-frequency characteristic curve of each vibration measurement point obtained when the circuit breaker is operated for the first time during the installation and commissioning of the GIS device of the same model at the same station or after a certain maintenance is selected as the reference reference signal |H n (f)| ref .

[0072] Further, in step S42, the low frequency band is 0-1 kHz; the middle frequency band is 1 k-5 kHZ; and the high frequency band is 5 k-20 kHz.

[0073] Furthermore, in step S40, the frequency response function H of each vibration measurement point is n (f) is calculated by formula (2), where G xyn (f) is x(t) and y n The cross power spectral density function of (t), G xx (f) is the auto-power spectral density function of x(t), H Rn (f) and H τn (f) are the real and imaginary parts of the frequency response function of each vibration measurement point.

[0074] H n (f) = G xyn (f) / G xx (f) = H Rn (f)+i×H τn (f) Formula (2)

[0075] Further, in step S41, the amplitude-frequency characteristic curve of the frequency response function within 0-20kHz of each vibration measurement point |H n (f)|, calculated by formula (3), where H Rn (f) and H τn (f) are the real and imaginary parts of the frequency response function of each vibration measurement point.

[0076]

[0077] The above-mentioned distributed mechanical state evaluation method of GIS equipment based on circuit breaker action, by setting an acceleration sensor for collecting excitation signals on the surface of the GIS circuit breaker shell, and setting multiple vibration measuring points at key positions around the circuit breaker, and arranging acceleration sensors at each vibration measuring point to form a distributed sensor network, can collect the transient vibration excitation signal when the GIS circuit breaker is in action and the vibration response signal of each vibration measuring point, and then extract the amplitude-frequency characteristic curve at each vibration measuring point from the transient vibration excitation signal and the vibration response signal, take it as the current mechanical state, and compare it with the reference benchmark signal, so as to obtain the amplitude-frequency characteristic curve at each vibration measuring point that can reflect the mechanical state of the GIS equipment. The state characteristic parameters of the mechanical state are obtained, and then the distributed mechanical state evaluation of the GIS equipment is performed according to the evaluation criteria; compared with the method in the prior art in which operators make judgments based on observation and personal experience, on the one hand, the present invention is more objective and accurate in evaluating the mechanical state of GIS equipment, and can provide decision support for preventive maintenance and fault handling of GIS equipment, which is helpful to extend the life of GIS equipment and improve the safety of power operation and maintenance; on the other hand, because multiple vibration measuring points are set, the mechanical state of the internal structure corresponding to each vibration measuring point of the GIS equipment can be evaluated more accurately, and the fault location is more accurate and comprehensive, which provides strong support for subsequent maintenance.

[0078] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action, characterized in that: The following steps are involved: S1. Distributed sensor network construction, including: S10, setting an acceleration sensor for collecting excitation signals on the surface of the GIS circuit breaker housing; S11. Vibration measuring points are respectively set on the insulating basin of the GIS circuit breaker, the surface and insulating basin of the CT housing, the surface and insulating basin of the PT housing, the surface and insulating basin of the busbar housing, and the operating mechanism, and an acceleration sensor for collecting vibration response signals is set at each vibration measuring point; S2. Signal acquisition, including: S20, triggering and collecting data through an acceleration sensor disposed on the surface of the GIS circuit breaker housing to obtain the original transient vibration excitation signal x′(t) when the circuit breaker is in action; S21, using the acceleration sensors set at each vibration measuring point to synchronously collect data, and obtain the original vibration response signal y′ of each vibration measuring point after the circuit breaker is actuated n (t), n = 1, 2..., n is the number of each vibration measurement point; S3. Signal preprocessing: The original transient vibration excitation signal x′(t) and the original vibration response signal y′ n (t) Perform filtering, denoising and normalization preprocessing respectively to obtain the transient vibration excitation signal x(t) and the vibration response signal y of each vibration measurement point n (t); S4. Extraction of state characteristic parameters, including: S40, based on the transient vibration excitation signal x(t) and the vibration response signal y of each vibration measurement point n (t), obtain the frequency response function H of each vibration measurement point n (f); S41, according to the frequency response function H of each vibration measurement point n (f) Obtain the amplitude-frequency characteristic curve of the frequency response function within 0-20kHz at each vibration measurement point |H n (f)|; S42, according to the amplitude-frequency characteristic curve of each vibration measurement point |H n (f)|, obtain the correlation coefficient R between the current mechanical state signal of each vibration measurement point and the reference benchmark signal in the low frequency band nLF , correlation coefficient R in the mid-frequency band nMF , and the correlation coefficient R in the high frequency band nHF , as the state characteristic parameter of each vibration measuring point; S5. Status evaluation: According to the extracted state characteristic parameters of each vibration measuring point and combined with the preset mechanical state evaluation standard, the distributed mechanical state evaluation of GIS equipment is carried out.

2. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 1, characterized in that: In step S5, the preset mechanical state evaluation criteria are as follows: When the vibration point R nLF When <0.7, it is determined that the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment has a serious mechanical failure; When 0.7≤R nLF <0.8, or R nMF When <0.8, the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment is judged to be a slight mechanical failure; When 0.8≤R nLF <0.9 or 0.8≤R nMF When <0.9, the mechanical state of the internal structure corresponding to the vibration measurement point of the GIS equipment is judged to be a suspected mechanical failure; When 0.9≤R nLF ≤1 and 0.9≤R nMF and 0.8≤R nHF At this time, the mechanical state of the internal structure of the GIS equipment corresponding to this vibration measuring point is determined to be normal.

3. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 2, characterized in that: When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a serious mechanical failure, it needs to be shut down immediately; When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a minor mechanical failure, a comprehensive analysis is required; When the mechanical state of the internal structure of the GIS equipment corresponding to a certain vibration measurement point is judged to be a suspected mechanical failure, enhanced monitoring is required.

4. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 1, characterized in that: In step S42, the correlation coefficient R nLF , R nMF , R nHF The steps to obtain are as follows: S420, record the amplitude-frequency characteristic curve of each vibration measurement point obtained when the circuit breaker is operated for the first time during the installation and commissioning of GIS equipment or after a certain maintenance as the reference reference signal | H n (f)| ref , record the amplitude-frequency characteristic curve of each vibration measurement point obtained after the current circuit breaker action|H n (f) | is the current mechanical state signal; S421. According to formula (1), the correlation coefficient R between the current mechanical state signal of each vibration measurement point of the GIS equipment and the reference reference signal in the low frequency band is calculated respectively. nLF , correlation coefficient R in the mid-frequency band nMF , and the correlation coefficient R in the high frequency band nHF , where Cov(|H n (f)| ref ,|H n (f)|) is the covariance between the current mechanical state signal of each vibration measurement point and the reference reference signal, Var(|H n (f)| ref ) is the covariance of the reference signal of each vibration measurement point, Var(|H n (f)|) is the covariance of the current mechanical state signal of each vibration measurement point.

5. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 4, characterized in that: In step S420, if the GIS device has no historical data as a reference, the amplitude-frequency characteristic curve of each vibration measurement point obtained when the circuit breaker is operated for the first time during the installation and commissioning of the GIS device of the same model at the same station or after a certain maintenance is selected as the reference reference signal |H n (f)| ref .

6. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 1, characterized in that: In step S42, the low frequency band is 0-1 kHz; the middle frequency band is 1 k-5 kHZ; and the high frequency band is 5 k-20 kHz.

7. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 1, characterized in that: In step S40, the frequency response function H of each vibration measurement point is n (f) is calculated by formula (2), where G xyn (f) is x(t) and y n The cross power spectral density function of (t), G xx (f) is the auto-power spectral density function of x(t), H Rn (f) and H τn (f) are the real and imaginary parts of the frequency response function of each vibration measurement point. H n (f) = G xyn (f) / G xx (f) = H Rn (f)+i×H τn (f) Formula (2) 8. The method for evaluating the distributed mechanical state of GIS equipment based on circuit breaker action according to claim 7, characterized in that: In step S41, the amplitude-frequency characteristic curve of the frequency response function within 0-20kHz of each vibration measurement point |H n (f)|, calculated by formula (3), where H Rn (f) and H τn (f) are the real and imaginary parts of the frequency response function of each vibration measurement point.

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