CN114137374A - A modal analysis-based method for detecting the electrification of the surface of GIS basin insulators - Google Patents
A modal analysis-based method for detecting the electrification of the surface of GIS basin insulators Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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Abstract
本发明提供了一种基于模态分析的GIS盆式绝缘子表面状态带电检测方法，属电力技术领域。一种基于模态分析的GIS盆式绝缘子表面状态带电检测方法，构建GIS的盆式绝缘子模型，仿真盆式绝缘子表面存在不同程度污秽、不同种类污秽及不同位置污秽时的模态特征。采有有限元软件构建模型，利用仿真的方法计算振动传递函数的变化规律，获得能表征盆式绝缘子表面状态的传递函数特征频率范围。本发明解决了无法针对GIS内部盆式绝缘子进行全方位，高精度，高安全性非介入监测的问题。
The invention provides a method for detecting the electrification of the surface state of a GIS basin-type insulator based on modal analysis, which belongs to the technical field of electric power. A modal analysis-based GIS pot insulator surface state electrification detection method, constructs a GIS pot insulator model, and simulates the modal characteristics of the pot insulator surface with different degrees of contamination, different types of contamination and contamination at different locations. The finite element software is used to build the model, and the variation law of the vibration transfer function is calculated by the simulation method, and the characteristic frequency range of the transfer function that can characterize the surface state of the basin insulator is obtained. The invention solves the problem that all-round, high-precision and high-safety non-intrusive monitoring cannot be performed for the GIS internal basin insulator.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a GIS basin-type insulator surface state live detection method based on modal analysis.
Background
In recent years, with the rapid development of national economy, the power demand is rapidly increased, the capacity of a power grid is continuously expanded, and the voltage level is continuously improved, which all put higher requirements on the reliability and safety of the power grid. Gas insulated totally enclosed switchgear (GIS) is widely used not only in the high voltage and ultra high voltage fields, but also in the ultra high voltage field. By counting the occurrence frequency of the GIS equipment faults, the internal insulation faults in the GIS equipment faults account for a large proportion. GIS equipment insulation failure mostly comes from manufacturing and installation process, and the insulator itself appears bubble or crackle, and insulator surface adheres to filth to be the leading factor that leads to insulation failure. Therefore, the more conductive impurities on the surface of the basin-type insulator are accumulated, the more and more poor voltage distribution equilibrium degree on the surface is caused, the flashover voltage value on the surface of the basin-type insulator is lower and lower, and when the flashover voltage value is lower to a certain value, the flashover discharge occurs on the surface of the basin-type insulator. The insulation capability of the basin-type insulator is continuously reduced due to flashover discharge on the surface of the basin-type insulator, and finally serious safety accidents are caused. Therefore, the method adopts the targeted measures to timely detect and master the pollution state of the basin-type insulator in the GIS, and the method is the fundamental way of ensuring the safety of the basin-type insulator before the basin-type insulator is treated before the partial discharge of the basin-type insulator occurs.
Chinese patent document CN202011393531.3 discloses a non-contact zero-value insulator live-line detection system, which includes an aircraft, a space electric field detector and a ground station; the aircraft is used for carrying the space electric field detector to fly to the vicinity of the overhead line insulator; the space electric field detector is used for detecting the intensity of the synthesized electric field around the insulator and sending detection data to the ground station; the ground station is used for controlling the unmanned aerial vehicle to fly, and receiving the analysis detection data to obtain the detection result of the zero-value insulator. The invention also discloses a non-contact zero-value insulator live-line detection method, which comprises the following steps: detecting the resultant electric field intensity around the overhead line insulator through an aircraft carrying a space electric field detector, and transmitting detection data to a ground station; and the ground station controls the aircraft and analyzes the received detection data to obtain a detection result of the zero-value insulator. Zero-value insulator detection is realized in a tower climbing-free and non-contact manner; through aircraft flight detection, compare with the manual detection of traditional tower of stepping on, the security is high, and is efficient. But it cannot solve the problem of large monitoring area.
Chinese patent document CN20150708804.1 discloses a wireless ad hoc network communication-based insulator live-line detection system and method, which belong to the technical field of power equipment detection. But it does not solve the problem of monitoring comprehensiveness.
Disclosure of Invention
The invention aims to provide a GIS basin-type insulator surface state live detection method based on modal analysis, and solves the problem that omnibearing, high-precision and high-safety non-intervention monitoring cannot be carried out on a basin-type insulator in a GIS.
In order to achieve the purpose, the invention adopts the following technical scheme:
a GIS basin-type insulator surface state live detection method based on modal analysis is used for constructing a basin-type insulator model of a GIS and simulating modal characteristics of different degrees of dirt, different types of dirt and different positions of the surface of a basin-type insulator. A finite element software is adopted to construct a model, the change rule of the vibration transfer function is calculated by a simulation method, and a transfer function characteristic frequency range capable of representing the surface state of the basin-type insulator is obtained.
Preferably, basin-type insulators on a GIS (geographic information System) of a laboratory entity are used for respectively constructing models with different surface filths and carrying out test mode detection.
Preferably, based on simulation analysis, when the surface states of the basin-type insulator surface pollution types, distribution positions, pollution degrees and the like are tested to change, the influence rule of various factors on modal characteristics is tested, the relation between the vibration transfer function and the basin surface state is obtained, and the standard for judging the basin surface state by using modal signal characteristics is obtained.
Preferably, a force hammer is used as an excitation source to obtain a vibration transfer function, the relation between the signal attenuation characteristic and the surface state characteristic of the basin is researched, and a method for obtaining the surface state characteristic through vibration transfer function signal detection is established.
Preferably, based on simulation and experimental research, a modal analysis-based live detection system which is stable in signal and can realize field detection is constructed, and a large amount of field detection is carried out.
Furthermore, at present, a lot of researches are carried out on pollution detection of line and station insulators, various methods are also provided, and detection on the pollution state of the basin-type insulator in the GIS is less. The main reason is that the GIS adopts a fully sealed structure, various sensors and detection equipment are difficult to implant, and any sensor cannot be implanted for direct measurement, so that no method for detecting the pollution state of the GIS exists at present. Chinese patent document CN202011393531.3 published in 03, 16 and 2021 discloses a non-contact zero-value insulator live-line detection system. Only solved and detected through aircraft flight, step on the tower manual detection with the tradition and compare, the security is high, efficient problem.
Even if the partial discharge detection method is adopted, the epoxy material absorbs ultrahigh frequency electromagnetic waves and ultrasonic signals, so that severe surface type partial discharge occurs in time, and the generated ultrasonic signals and ultrahigh frequency signals are weak and difficult to detect in time. The reduction of the insulation performance caused by the pollution of the prior basin-type insulator is a blind spot, no effective method is used for detection, and the method only can be used for artificially and passively waiting for insulation flashover and then carrying out replacement work.
Furthermore, the number of the basin-type insulators in the GIS is large, and a specific sensor cannot be installed on one insulator.
The invention provides a non-intrusive detection method, which utilizes the principle that the mode of a basin-type insulator can change when dirt exists on the surface of the basin-type insulator to carry out mode test measurement on the electrification of the basin-type insulator, obtains a test vibration transfer function of the basin-type insulator, and further carries out electrification detection on the surface dirt state of the basin-type insulator based on the test vibration transfer function.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for detecting the surface state of a basin-type insulator based on modal analysis, which respectively carries out relevant research on the influence of four conditions of dirt attached to the surface, cracks on the surface, bubbles on the surface and metal impurities on the surface on the basin mode, and finally provides a modal index for judging the surface state of the basin-type insulator by combining test and simulation for analysis. The project has important practical and scientific significance for timely detecting the surface state of the basin-type insulator, avoiding flashover of the basin-type insulator, perfecting the operation maintenance level of the GIS equipment and improving the operation reliability of the GIS equipment.
The method utilizes online modal analysis to detect the pollution degree of the basin-type insulator, has effectiveness and field implementability, and can provide an effective method and approach for solving the problem of detecting the surface state of the insulator. In addition, the modal analysis detection technology has high sensitivity, strong operability and simple test, is widely applied to defect detection, and provides an effective way for ensuring the safety of equipment.
The invention researches on the charged detection of the surface state of the GIS basin-type insulator, and provides an effective solution for the current 'blind spot' and 'pain spot' of field detection. The innovation point is that a detection method in the mechanical field is introduced into the state detection of the electrical equipment, and an effective solution is provided for the evaluation of the surface state of the GIS basin-type insulator. In addition, the pollution state of the basin-type insulator is mastered, technical support is provided for field operation of the GIS, and the method has a profound application value.
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The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1: the schematic diagram of the basin-type insulator in embodiment 1 of the invention.
Detailed Description
For a better understanding of the invention, the following description is given in conjunction with the examples and the accompanying drawings, but the invention is not limited to the examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Example 1
Referring to fig. 1, a GIS basin-type insulator surface state live detection method based on modal analysis constructs a basin-type insulator model of a GIS, and simulates modal characteristics of different degrees of contamination, different types of contamination and different positions of contamination on the surface of a basin-type insulator. A finite element software is adopted to construct a model, the change rule of the vibration transfer function is calculated by a simulation method, and a transfer function characteristic frequency range capable of representing the surface state of the basin-type insulator is obtained.
A three-dimensional model is built for the 110kV basin-type insulator, the geometric dimensions of the basin-type insulator are all measured, the outer diameter is 400mm, the thickness is 34mm, and the curved surface is smooth by adopting fillet treatment. Will build 110kV basinThe sub three-dimensional model is imported into COMSOL, the physical field tree selects solid mechanics in structural mechanics, the characteristic frequency in the general research is selected in the research tree, and then all the sub three-dimensional models are constructed in COMSOL to form a union. Filling and selecting epoxy resin Filled epoxy resin (X238) [ solid ] in basin-type insulator material]The Young's modulus E of the epoxy resin is set to 10^9Pa, and the Poisson ratio nu is set to 0.38. The dirt is filled by covering a thin surface on the surface of the basin, and the dirt density is set to be 1070kg/m of dust bulk density3Young's modulus E is set to 1.9 x 10^11Pa, and Poisson ratio nu is set to 0.16. The grid division is divided by selecting a software default, and the unit size is conventional. The grid is divided into default divisions, and the grid at the filthy side is significantly smaller than the grids elsewhere. The natural modes refer to the modes when the system is vibrating freely, so no constraints have to be added to the basin.
Furthermore, basin-type insulators on a GIS (geographic information System) of a laboratory entity are utilized to respectively construct models of different surface filth and carry out test mode detection. The reasons for influencing the surface state of the basin-type insulator are four, namely dirt attached to the surface, cracks on the surface, defects on the surface and metal impurities on the surface. The GIS disassembly result of the transformer substation site shows that the dirt attached to the surface of the basin-type insulator is the most common reason for changing the surface state of the basin-type insulator, so that the simulation mainly detects the influence of the attached dirt on the inherent mode of the basin, and mainly detects the influence of four factors of dirt position, area, quality and type.
Further, based on simulation analysis, when the surface states of the surface contamination types, distribution positions, contamination degrees and the like of the test basin-type insulator are changed, the influence rule of various factors on modal characteristics is obtained, the relation between the vibration transfer function and the basin surface state is obtained, and the standard for judging the basin surface state by utilizing modal signal characteristics is obtained:
1. when the surface of the basin-type insulator is polluted, the first 14 natural frequency values of the basin-type insulator generally rise, and the larger the surface pollution quality is, the more the surface pollution quality is.
2. When the dirt exists only in a certain area on the surface of the basin-type insulator, the circular symmetrical structure of the dirt is damaged, and partial heavy root modal phenomenon disappears.
3. The wider the area of the dirt is, the more obvious the influence on the higher order natural frequency is, the most obvious the influence on the 1 st order natural frequency and the 2 nd order natural frequency under the condition of more concentrated dirt is, and when the dirt covers the whole surface of the basin-type insulator, the most obvious influence is on each order natural frequency near 330-380 Hz.
4. The conductive contamination and the non-conductive contamination with the same mass, the same area and the same distribution position have the same influence on the natural frequency.
Further, a force hammer is used as an excitation source to obtain a vibration transfer function, the relation between the signal attenuation characteristic and the surface state characteristic of the basin is researched, and a method for obtaining the surface state characteristic through vibration transfer function signal detection is established.
Further, based on simulation and experimental research, a live detection system based on modal analysis and stable in signal and capable of realizing field detection is constructed, and a large amount of field detection is carried out. The force hammer strikes the basin to obtain an excitation signal, the basin vibrates, the vibration acceleration sensor is arranged at a proper position to receive a vibration response signal, the sensor in the force hammer can obtain the excitation signal, the excitation signal and the response signal are collected by the collection card and transmitted to data processing software of an upper computer, then data processing and modal characteristic extraction are carried out, and the surface condition of the basin is obtained through analysis.
The invention provides a method for detecting the surface state of a basin-type insulator based on modal analysis, which respectively carries out relevant research on the influence of four conditions of dirt attached to the surface, cracks on the surface, bubbles on the surface and metal impurities on the surface on the basin mode, and finally provides a modal index for judging the surface state of the basin-type insulator by combining test and simulation for analysis. The project has important practical and scientific significance for timely detecting the surface state of the basin-type insulator, avoiding flashover of the basin-type insulator, perfecting the operation maintenance level of the GIS equipment and improving the operation reliability of the GIS equipment.
The method utilizes online modal analysis to detect the pollution degree of the basin-type insulator, has effectiveness and field implementability, and can provide an effective method and approach for solving the problem of detecting the surface state of the insulator. In addition, the modal analysis detection technology has high sensitivity, strong operability and simple test, is widely applied to defect detection, and provides an effective way for ensuring the safety of equipment.
The invention researches on the charged detection of the surface state of the GIS basin-type insulator, and provides an effective solution for the current 'blind spot' and 'pain spot' of field detection. The innovation point is that a detection method in the mechanical field is introduced into the state detection of the electrical equipment, and an effective solution is provided for the evaluation of the surface state of the GIS basin-type insulator. In addition, the pollution state of the basin-type insulator is mastered, technical support is provided for field operation of the GIS, and the method has a profound application value.
Example 2
A GIS basin-type insulator surface state live line detection method based on modal analysis is different from embodiment 1 in that: a220 kV basin is taken as a research object, a 220kV basin-type insulator three-dimensional model is established, the geometric dimensions of the basin-type insulator are all actually measured, the outer diameter is 480mm, the thickness is 38mm, the curved surface is smooth by chamfering, and the diameter of a screw hole is 10 mm.
The method can be used for detecting the surface state of the 220KV GIS basin-type insulator, provides an effective way for ensuring the safety of equipment, grasps the dirty state of the basin-type insulator, provides technical support for the field operation of the GIS, and has profound application value.
Example 3
A GIS basin-type insulator surface state live line detection method based on modal analysis is different from embodiment 1 in that: a330 kV basin is used as a detection object, and a 330kV basin-type insulator three-dimensional model is established. The geometric dimension of the basin-type insulator is actually measured, the outer diameter is 520mm, the thickness is 40mm, and the curved surface is smooth by adopting fillet treatment.
The method can be applied to the surface state detection of the 330KV GIS basin-type insulator, provides an effective way for ensuring the equipment safety, grasps the dirty state of the basin-type insulator, provides technical support for the field operation of the GIS, and has profound application value.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A GIS basin-type insulator surface state live detection method based on modal analysis is characterized in that a basin-type insulator model of a GIS is built, modal characteristics of different degrees of dirt, different types of dirt and different positions of the dirt exist on the surface of a simulated basin-type insulator, finite element software is adopted to build the model, the change rule of a vibration transfer function is calculated by using the simulation method, and a transfer function characteristic frequency range capable of representing the basin-type insulator surface state is obtained.
2. The method for detecting the surface state of the GIS basin-type insulator based on modal analysis according to claim 1, characterized in that basin-type insulators on a laboratory entity GIS are used for respectively constructing models of different surface dirt and carrying out test modal detection.
3. The method for detecting the charged state of the surface of the GIS basin-type insulator based on the modal analysis as claimed in claim 1, wherein based on the simulation analysis, when the surface states of the basin-type insulator surface pollution types, distribution positions, pollution degrees and the like are tested to change, the influence rule of various factors on the modal characteristics is tested, the relationship between the vibration transfer function and the basin surface state is obtained, and the standard for judging the basin surface state by using the modal signal characteristics is obtained.
4. The charged detection method for the surface state of the GIS basin-type insulator based on modal analysis as claimed in claim 1, characterized in that a vibration transfer function is obtained by using a force hammer as an excitation source, the relation between the signal attenuation characteristic and the basin surface state characteristic is studied, and the method for obtaining the surface state characteristic through vibration transfer function signal detection is established.
5. The method for detecting the charged surface state of the GIS basin-type insulator based on modal analysis according to claim 1, wherein a modal analysis-based charged detection system which is stable in signal and can realize field detection is constructed based on simulation and experimental research, and a large number of field detections are performed.
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