CN111474241A - Method for evaluating latent fault factors existing in GIS structural state - Google Patents
Method for evaluating latent fault factors existing in GIS structural state Download PDFInfo
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Abstract
The invention discloses a method for evaluating latent fault factors existing in a GIS (geographic information System) structural state, which solves the problem that how to timely evaluate structural change of the GIS structure easily causes accidents. The method comprises the steps of arranging a plurality of excitation frequency response test points on the same cross section of the GIS at equal intervals, arranging a force hammer excitation point between two adjacent excitation frequency response test points, applying a certain force on the force hammer excitation point through a force hammer, arranging a vibration acceleration sensor on the excitation frequency response test points, obtaining a response signal from the vibration acceleration sensor, processing the excitation signal and the response signal through corresponding signal amplifiers, inputting the processed signals into a modal analyzer as input signals, carrying out frequency response function analysis, comparing frequency response functions obtained by two times of measurement according to frequency response function amplitude values or frequency response function imaginary part extreme values, and judging the structure of the GIS.
Description
Technical Field
The invention relates to an evaluation method for latent fault factors existing in a GIS (geographic information System) structural state, which is suitable for accurately and timely detecting and evaluating the structural state of a running GIS.
Background
The enclosed gas insulated switchgear (GIS for short) has the characteristics of small occupied area, high reliability and good insulation, and is widely applied to a power grid; the GIS is simple in structure and is formed by combining a plurality of separated basin-type insulator air chambers, and due to the totally-closed structural characteristic, once an accident occurs, the consequences caused by the accident are more serious and the repairing is more complex, so that the accident is eliminated at the sprouting stage by carrying out detection and evaluation in advance; in various accidents of the GIS, due to factors such as temperature, humidity and ground settlement, the gas leakage of a GIS gas chamber, the breakage of a basin-type insulator, the crack of a metal shell and other structures are often directly caused to change, and the reasons for generating the structural defects are three, (1) due to the assembly environment, various foreign matters can be attached to the inside of equipment, and when the equipment reaches a certain degree, creeping discharge can be induced; (2) irregular assembly in the assembly process can directly cause potential risk factors such as unreasonable stress on the GIS structure, defects of buried structural components and the like; (2) in the later operation process, the GIS overall structure can be directly changed due to environmental factors such as the sedimentation of the ground at the installation position, the change of temperature and humidity and the like; when structural defects of the GIS occur, the inherent structural state of the GIS can be changed, including parameters such as modal frequency, vibration mode and damping, so that the structural state of the GIS can be judged by collecting and analyzing the parameters, and the operation of the GIS can be timely adjusted, thereby ensuring the normal operation of a power grid.
Disclosure of Invention
The invention provides an evaluation method for latent fault factors existing in a GIS structure state, and solves the technical problem that an accident is easily caused by how to timely evaluate structural change of the GIS structure.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the method comprises the steps of arranging a plurality of excitation frequency response test points on the same cross section of the GIS at equal intervals, arranging a force hammer excitation point between two adjacent excitation frequency response test points, applying a certain force on the force hammer excitation point through a force hammer, arranging a vibration acceleration sensor on the excitation frequency response test points, obtaining a response signal from the vibration acceleration sensor, processing the excitation signal and the response signal through corresponding signal amplifiers, inputting the processed signals into a modal analyzer as input signals, carrying out frequency response function analysis, comparing frequency response functions obtained by two times of measurement according to frequency response function amplitude values or frequency response function imaginary part extreme values, and judging the structure of the GIS.
A method for evaluating latent fault factors existing in a GIS structural state is characterized by comprising the following steps:
firstly, selecting a certain cross section of the GIS as a detection section, wherein the detection section is arranged on a metal shell of the GIS or a basin-type insulator;
secondly, determining eight frequency response signal acquisition points at equal intervals in radian on the detection section selected in the first step, and arranging an acceleration sensor (5) on each frequency response signal acquisition point; selecting a force hammer knocking point on the detection section selected in the first step, and arranging a force hammer (6) on the selected force hammer knocking point;
thirdly, connecting the output end of the force hammer with the input end of a single-path signal amplifier by using a single-path signal transmission line, and connecting the output end of the single-path signal amplifier with the single-path signal input end of a modal analyzer; connecting the acceleration sensors on the eight frequency response signal acquisition points with the input end of a multi-path signal amplifier by using a multi-path signal transmission line, and connecting the output end of the multi-path signal amplifier with the multi-path signal input end of a modal analyzer;
fourthly, after the GIS runs for one week in an electrified mode, under the conditions that the ambient temperature is higher than 5 ℃ and the ambient humidity is lower than 80%, the force hammer serves as an excitation source to generate an excitation signal F1 (t), and response signals X1 (t) generated by the force hammer in a knocking mode are received through acceleration sensors on eight frequency response signal acquisition points;
fifthly, performing Fast Fourier Transform (FFT) on the excitation signal function F1 (t) and the response signal function X1 (t) obtained in the fourth step through a modal analyzer to respectively obtain an excitation signal function F1 (omega) and a response signal function X1 (omega) in a frequency domain; the transfer function H1 (ω) at this time is calculated by the mode analyzer, and the calculation formula is: h1 (omega) = X1 (omega)/F1 (omega), drawing a corresponding amplitude-frequency curve, simultaneously obtaining a vibration mode diagram of the GIS at the position, and recording state parameters, namely the natural frequency and the vibration mode, of the GIS operation basic structure obtained at the time;
sixthly, after the GIS is operated for a period of time in an electrified way:
firstly, laying eight frequency response signal acquisition points on the cross section selected in the first step according to the frequency response signal acquisition points selected in the second step, laying a force hammer on the force hammer knocking points selected in the second step, and repeating the step of the third step;
then, repeating the fourth step of hammer strike to obtain an excitation signal F2 (t) and a response signal X2 (t);
finally, performing FFT (fast Fourier transform) on the excitation signal function F2 (t) and the response signal function X2 (t) obtained at this time by using a modal analyzer to respectively obtain an excitation signal function F2 (omega) and a response signal function X2 (omega) in a frequency domain; the transfer function H2 (ω) at this time is calculated by the mode analyzer, and the calculation formula is: h2 (omega) = X2 (omega)/F2 (omega), drawing a corresponding amplitude-frequency curve, and meanwhile, obtaining a mode shape graph of the GIS at the position;
and seventhly, comparing the modal parameters obtained in the fifth step with the modal parameters obtained in the sixth step as follows: (1) comparing amplitude-frequency curves of H1 (omega) and H2 (omega), and if the amplitude difference of the amplitude curves at the same frequency is more than 20%, judging that the GIS interval has a latent fault factor; (2) and comparing the two vibration mode diagrams, and judging that the GIS interval has a latent fault factor if the amplitude difference of the vibration mode diagrams at the same position is more than 1%.
The invention can detect the structural state of the GIS under the power failure and electrification conditions, and can evaluate the structural states of the whole GIS and parts by comparing modal parameters of different operation stages, thereby improving the operation reliability of the GIS equipment.
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Fig. 1 is a schematic diagram of the signal acquisition structure of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a method for evaluating latent fault factors existing in a GIS structural state is characterized by comprising the following steps:
firstly, selecting a certain cross section of the GIS as a detection section, wherein the detection section is arranged on a metal shell 3 of the GIS or on a basin-type insulator 1;
secondly, determining eight frequency response signal acquisition points at equal intervals in radian on the detection section selected in the first step, and arranging an acceleration sensor 5 on each frequency response signal acquisition point; selecting a force hammer knocking point on the detection section selected in the first step, and arranging a force hammer 6 on the selected force hammer knocking point;
thirdly, the output end of the force hammer 6 is connected with the input end of a single-path signal amplifier 7 by a single-path signal transmission line 9, and the output end of the single-path signal amplifier 7 is connected with the single-path signal input end of a mode analyzer 11; connecting the acceleration sensors 5 on the eight frequency response signal acquisition points with the input end of a multi-channel signal amplifier 8 by using a multi-channel signal transmission line 10, and connecting the output end of the multi-channel signal amplifier 8 with the multi-channel signal input end of a modal analyzer 11;
fourthly, after the GIS runs for one week in an electrified mode, under the conditions that the ambient temperature is higher than 5 ℃ and the ambient humidity is lower than 80%, the force hammer 6 serves as an excitation source to generate an excitation signal F1 (t), and response signals X1 (t) generated by the force hammer 6 in a knocking mode are received through acceleration sensors 5 on eight frequency response signal acquisition points;
fifthly, performing Fast Fourier Transform (FFT) on the excitation signal function F1 (t) and the response signal function X1 (t) obtained in the fourth step by using the modal analyzer 11 to obtain an excitation signal function F1 (ω) and a response signal function X1 (ω) in a frequency domain, respectively; the mode analyzer 11 calculates a transfer function H1 (ω) at this time by the formula: h1 (omega) = X1 (omega)/F1 (omega), drawing a corresponding amplitude-frequency curve, simultaneously obtaining a vibration mode diagram of the GIS at the position, and recording state parameters, namely the natural frequency and the vibration mode, of the GIS operation basic structure obtained at the time;
sixthly, after the GIS is operated for a period of time in an electrified way:
firstly, laying eight frequency response signal acquisition points on the cross section selected in the first step according to the frequency response signal acquisition points selected in the second step, laying a force hammer 6 on the force hammer knocking points selected in the second step, and repeating the step of the third step;
then, the force hammer 6 is knocked repeatedly in the fourth step, and an excitation signal F2 (t) and a response signal X2 (t) are obtained at the moment;
finally, the mode analyzer 11 performs FFT on the excitation signal function F2 (t) and the response signal function X2 (t) obtained this time to obtain an excitation signal function F2 (ω) and a response signal function X2 (ω) in the frequency domain, respectively; the mode analyzer 11 calculates a transfer function H2 (ω) at this time by the formula: h2 (omega) = X2 (omega)/F2 (omega), drawing a corresponding amplitude-frequency curve, and meanwhile, obtaining a mode shape graph of the GIS at the position;
and seventhly, comparing the modal parameters obtained in the fifth step with the modal parameters obtained in the sixth step as follows: (1) comparing amplitude-frequency curves of H1 (omega) and H2 (omega), and if the amplitude difference of the amplitude curves at the same frequency is more than 20%, judging that the GIS interval has a latent fault factor; (2) and comparing the two vibration mode diagrams, and judging that the GIS interval has a latent fault factor if the amplitude difference of the vibration mode diagrams at the same position is more than 1%.
The invention obtains the modal parameters of each interval of the GIS, namely the natural frequency and the vibration mode, by analyzing the modal parameters of different stages through the modal analyzer 11, and can comprehensively judge the running states of the whole GIS and internal components thereof, such as a circuit breaker, a disconnecting switch, a basin-type insulator and the like, thereby timely and accurately judging and mastering potential fault factors of the GIS and effectively avoiding the occurrence of events such as sudden power failure and the like caused by GIS equipment faults.
Claims (1)
1. A method for evaluating latent fault factors existing in a GIS structural state is characterized by comprising the following steps:
firstly, selecting a certain cross section of the GIS as a detection section, wherein the detection section is arranged on a metal shell (3) of the GIS or a basin-type insulator (1);
secondly, determining eight frequency response signal acquisition points at equal intervals in radian on the detection section selected in the first step, and arranging an acceleration sensor (5) on each frequency response signal acquisition point; selecting a force hammer knocking point on the detection section selected in the first step, and arranging a force hammer (6) on the selected force hammer knocking point;
thirdly, the output end of the force hammer (6) is connected with the input end of a single-path signal amplifier (7) by a single-path signal transmission line (9), and the output end of the single-path signal amplifier (7) is connected with the single-path signal input end of a modal analyzer (11); connecting the acceleration sensors (5) on the eight frequency response signal acquisition points with the input end of a multi-channel signal amplifier (8) by using a multi-channel signal transmission line (10), and connecting the output end of the multi-channel signal amplifier (8) with the multi-channel signal input end of a modal analyzer (11);
fourthly, after the GIS is electrified for one week, under the conditions that the ambient temperature is higher than 5 ℃ and the ambient humidity is lower than 80%, the knocking force hammer (6) serves as an excitation source to generate an excitation signal F1 (t), and a response signal X1 (t) generated by knocking of the knocking force hammer (6) is received through acceleration sensors (5) on eight frequency response signal acquisition points;
fifthly, performing fast Fourier transform on the excitation signal function F1 (t) and the response signal function X1 (t) obtained in the fourth step by using a modal analyzer (11) to respectively obtain an excitation signal function F1 (omega) and a response signal function X1 (omega) in a frequency domain; the mode analyzer (11) calculates a transfer function H1 (ω) at this time by the following formula: h1 (omega) = X1 (omega)/F1 (omega), drawing a corresponding amplitude-frequency curve, simultaneously obtaining a vibration mode diagram of the GIS at the position, and recording state parameters, namely the natural frequency and the vibration mode, of the GIS operation basic structure obtained at the time;
sixthly, after the GIS is operated for a period of time in an electrified way:
firstly, distributing eight frequency response signal acquisition points on the cross section selected in the first step according to the frequency response signal acquisition points selected in the second step, distributing force hammers (6) on the force hammer knocking points selected in the second step, and repeating the step of the third step;
then, repeating the fourth step of knocking by the force hammer (6) to obtain an excitation signal F2 (t) and a response signal X2 (t) at the moment;
finally, fast Fourier transform is carried out on the excitation signal function F2 (t) and the response signal function X2 (t) obtained at this time through a modal analyzer (11), and an excitation signal function F2 (omega) and a response signal function X2 (omega) in a frequency domain are obtained respectively; the mode analyzer (11) calculates a transfer function H2 (ω) at this time by the following formula: h2 (omega) = X2 (omega)/F2 (omega), drawing a corresponding amplitude-frequency curve, and meanwhile, obtaining a mode shape graph of the GIS at the position;
and seventhly, comparing the modal parameters obtained in the fifth step with the modal parameters obtained in the sixth step as follows: (1) comparing amplitude-frequency curves of H1 (omega) and H2 (omega), and if the amplitude difference of the amplitude curves at the same frequency is more than 20%, judging that the GIS interval has a latent fault factor; (2) and comparing the two vibration mode diagrams, and judging that the GIS interval has a latent fault factor if the amplitude difference of the vibration mode diagrams at the same position is more than 1%.
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Cited By (7)
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| CN112595778A (en) * | 2020-12-17 | 2021-04-02 | 北京科技大学 | Dynamic damage identification method for structural sealant under non-reference model |
| CN112846937A (en) * | 2020-12-31 | 2021-05-28 | 西安交通大学 | Main shaft state online monitoring system and method |
| CN114200268A (en) * | 2021-12-07 | 2022-03-18 | 国网河南省电力公司检修公司 | Basin-type insulator surface state detection system and detection method based on modal analysis |
| CN114252199A (en) * | 2021-11-26 | 2022-03-29 | 潍柴动力股份有限公司 | Cylinder air leakage detection method and related device |
| CN114312906A (en) * | 2021-12-29 | 2022-04-12 | 中铁第四勘察设计院集团有限公司 | Floating slab track bed, self-vibration frequency detection method thereof and health monitoring method of vibration-damping track |
| CN114705282A (en) * | 2022-04-28 | 2022-07-05 | 浙江中新电力工程建设有限公司 | Modal-based lightning arrester fault detection method |
| CN117411570A (en) * | 2023-12-15 | 2024-01-16 | 深圳捷扬微电子有限公司 | Method and device for detecting state of antenna radio frequency channel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112595778A (en) * | 2020-12-17 | 2021-04-02 | 北京科技大学 | Dynamic damage identification method for structural sealant under non-reference model |
| CN112846937A (en) * | 2020-12-31 | 2021-05-28 | 西安交通大学 | Main shaft state online monitoring system and method |
| CN114252199A (en) * | 2021-11-26 | 2022-03-29 | 潍柴动力股份有限公司 | Cylinder air leakage detection method and related device |
| CN114252199B (en) * | 2021-11-26 | 2024-02-20 | 潍柴动力股份有限公司 | Cylinder air leakage detection method and related device |
| CN114200268A (en) * | 2021-12-07 | 2022-03-18 | 国网河南省电力公司检修公司 | Basin-type insulator surface state detection system and detection method based on modal analysis |
| CN114312906A (en) * | 2021-12-29 | 2022-04-12 | 中铁第四勘察设计院集团有限公司 | Floating slab track bed, self-vibration frequency detection method thereof and health monitoring method of vibration-damping track |
| CN114705282A (en) * | 2022-04-28 | 2022-07-05 | 浙江中新电力工程建设有限公司 | Modal-based lightning arrester fault detection method |
| CN117411570A (en) * | 2023-12-15 | 2024-01-16 | 深圳捷扬微电子有限公司 | Method and device for detecting state of antenna radio frequency channel |
| CN117411570B (en) * | 2023-12-15 | 2024-03-22 | 深圳捷扬微电子有限公司 | Method and device for detecting state of antenna radio frequency channel |
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