CN103558241B - The sample aging degree detection method of insulator - Google Patents
The sample aging degree detection method of insulator Download PDFInfo
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- CN103558241B CN103558241B CN201310531737.1A CN201310531737A CN103558241B CN 103558241 B CN103558241 B CN 103558241B CN 201310531737 A CN201310531737 A CN 201310531737A CN 103558241 B CN103558241 B CN 103558241B
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Abstract
The invention discloses the sample aging degree detection method of a kind of insulator, solve the problem that the uniformity of magnetic field of existing the Ageing of Insulators degree magnetic resonance detection magnet is not high.Comprise the cube shaped magnet submodule (1) choosing the identical magnetic material of 12 volumes identical to magnetize, make the identical magnetizing direction of the intensity that magnetizes of each cube shaped magnet submodule identical; The radian compartment of terrains such as 12 cube shaped magnet submodules are distributed on same circumferentially, the home position of uniform this same circumference place circle of 12 cube shaped magnet submodules arranges magnetic test coil (15), carry out detection to the signal in magnetic test coil to analyze, carry out electric magnetization to insulator sample, the magnetic resonance induction deamplification of generation is after prime amplifier, frequency mixer and analog to digital converter process successively; By parameters such as the height of each root characteristic spectral line on observation and analysis spectrogram, and contrast with normal data, realize the judgement to the Ageing of Insulators degree.
Description
Technical field
The present invention relates to a kind of magnetic resonance permanent magnet detection method of the relaxation behavior for detecting insulator sample, particularly a kind of detection method for detecting the sample aging degree of insulator.
Background technology
The principal ingredient of conventional silicone rubber composite insulator is dimethyl silicone polymer, its molecule with repeat silicon oxygen bond Si-O for main chain, Si atom is directly connected with the polymkeric substance such as methyl, vinyl, around the compact arranged nonpolar methyl group of Si-O main chain to surface orientation, shield the strong polarity of Si-O, make silastic surface present good hydrophobic nature.By the impact of extraneous rugged surroundings or corona discharge etc., insulator occurs aging, the moieties be connected with main chain Si atom is come off, the state of institute hydrogen atoms 1H changes, and mr techniques is according to the electromagnetic property of 1H, study the physics and chemistry character of 1H in material and residing molecule environment thereof, and analyze correlation molecule structure.Adopt the change of magnetic resonance method to silicon rubber insulator 1H state to analyze, can indirectly realize characterizing the quantitative and qualitative analysis of sample aging degree.At present, the online test method of composite insulator umbrella skirt material mainly contains infrared imaging method and ultrasonic Detection Method etc.Infrared imaging method, this method is used for the heatings such as wire, joint, sleeve pipe and detects and composite insulator local anomaly heating detection, and most insulating material caused by electric field damages relevant with temperature.Dielectric loss when shelf depreciation leakage current flows through megohmite insulant or ohmic loss all can cause insulator local temperature to raise.The infrared ray sent by observing hot localised points can find some defect.The shortcoming of this method be the high and temperature survey of instrument cost be subject to sunlight, strong wind, moisture, environment temperature and some can cause the impact of the factors such as insulator surface temperature sharply changes.Ultrasonic Detection Method, can reflect at the interface of two media based on ultrasound wave is entering into another kind of medium communication process from a kind of medium, reflect and the principle of mode conversion (P-wave And S conversion), the reflection wave of pulse ultrasonic wave when entering insulator medium and pass insulator medium sent by reception ultrasonic generator (being called transducer) is limited between the lane place of insulator.When " cracking " appears in insulator, then will there is the reflection wave of this defect on the time shaft receiving reflection wave, the concrete condition of defect in insulator can be judged by the size and location of this defect waves on time shaft.Ultrasound examination is simple to operate, safe and reliable, antijamming capability strong, mainly for detection of the crackle of core rod of insulator.But there is the problems such as coupling, decay and ultrasonic transducer performance in it.In addition, during actual measurement often there is corona in high-pressure side gold utensil, and reasons for its use noise can flood the sound wave that defects of insulator sends, and is not suitable for Site Detection, compares and be applicable to enterprise production on-line checkingi and laboratory verification etc.Known the Ageing of Insulators degree magnetic resonance detection probe is made up of minitype permanent-magnet and radio-frequency coil.Tested insulator sample is positioned among magnetic field of permanent magnet, hydrogen nuclei generation magnetic polarization in sample, radio-frequency coil produces a radio-frequency pulse magnetic field vertical with permanent magnet magnetic field direction in sample area, pull the static magnetization intensity vector of sample down 90 degree, in the process of described magnetization intensity vector return to primitive age state, induction electromotive force is produced at the two ends of radio-frequency coil after removing radio-frequency pulse magnetic field, i.e. magnetic resonance signal, complementary operation based on T2 (T2) is carried out to this signal, obtain T2 spectrum, by can determine the linked network time limit of tested insulator sample to the analysis of line structure." a kind of magnetic resonance sensors for composite insulator umbrella skirt aging Non-Destructive Testing " of the patent No. 201210248887.7 describes the Ageing of Insulators degree magnetic resonance pick-up unit based on two pieces of permanent magnets staggered relatively and planar coil, can be adapted to the insulator sample of different-thickness by the distance between mechanical adjustment two pieces of permanent magnets.Because described magnet forms for adopting conventional method monomer to magnetize, its magnetic field homogeneity in desired target area is not high, the magnetized homogeneity of sample can be affected, and then reduce the detection signal-to-noise ratio of magnetic resonance signal, increase the detection time of the Ageing of Insulators degree, in addition, adopt the adjustable magnet combination mode of spacing, although the applicability of described pick-up unit can be increased, but the magnetic flux density of neutral magnetic field can be made to change, and then magnetic resonance frequency changes, readjust with regard to needing the resonant frequency of radio frequency coil, add the complicacy that device uses.No matter be in laboratory or at substation field, the existence of one piece of high-intensity magnetic field magnet can bring certain potential safety hazard, particularly when moving magnet to the electrical equipment of surrounding normal work.
Summary of the invention
The invention provides the sample aging degree detection method of a kind of insulator, the uniformity of magnetic field solving existing the Ageing of Insulators degree magnetic resonance detection magnet is not high, and stray magnetic field is on the technical matters of the impact of surrounding environment.
The present invention solves above technical matters by the following technical programs:
The sample aging degree pick-up unit of a kind of insulator, comprise detected insulator sample, magnetic test coil and 12 magnetizing directions and all identical cube shaped magnet submodule of the intensity that magnetizes, the cube shaped magnet submodule that 12 volumes are identical be to wait radian compartment of terrain be distributed on same circumferentially, if choose the magnetizing direction of one of them cube shaped magnet submodule as benchmark, circumferentially same at this, the magnetizing direction of each cube shaped magnet submodule arranged successively along clockwise direction rotates 60 degree successively along clockwise direction, the home position of uniform this same circumference place circle of 12 cube shaped magnet submodules is provided with magnetic test coil, the central shaft of magnetic test coil is provided with detected insulator sample, one end ground connection of magnetic test coil, the other end of magnetic test coil is connected with one end of impedance matching capacitances, frequency tuning electric capacity is parallel with at the two ends of magnetic test coil, the other end of impedance matching capacitances is that one end of 1/4 wavelength lossless line and series diode one end to pipe are connected respectively with length, length is that the other end of 1/4 wavelength lossless line is connected with the input end of prime amplifier and parallel diode one end to pipe respectively, parallel diode is to the other end ground connection of pipe, the output terminal of prime amplifier is connected with one end of gate controlled switch, the other end of gate controlled switch is connected with the first input end of frequency mixer, the output terminal of frequency mixer is connected with the input end of analog to digital converter, the output terminal of analog to digital converter is connected with the input end of computing machine, the output terminal of computing machine is connected with the input end of radio-frequency signal source, the output terminal of radio-frequency signal source is connected with the second input end of frequency mixer and the input end of sampling switch respectively, the output terminal of sampling switch is connected with the input end of power amplifier, the output terminal of power amplifier is connected with the other end of series diode to pipe.
Described detected insulator sample is torus shape, and detected insulator sample is arranged on directly over magnetic test coil.
The sample aging degree detection method of a kind of insulator, comprises the following steps:
The first step, the cube shaped magnet submodule choosing the identical magnetic material of 12 volumes identical magnetize, and make the intensity that magnetizes of each cube shaped magnet submodule identical, and magnetizing direction are also identical;
Second step, the radian compartment of terrains such as 12 cube shaped magnet submodules are distributed on same circumferentially, if choose the magnetizing direction of one of them cube shaped magnet submodule as benchmark, circumferentially same at this, the magnetizing direction of each cube shaped magnet submodule arranged successively along clockwise direction to rotate 60 degree along clockwise direction successively;
3rd step, magnetic test coil is set on the home position of uniform this same circumference place circle of 12 cube shaped magnet submodules, detected insulator sample is set directly over the central shaft of magnetic test coil;
4th step, by one end ground connection of magnetic test coil, the other end of magnetic test coil is connected with one end of impedance matching capacitances, the frequency tuning electric capacity in parallel at the two ends of magnetic test coil, the other end of impedance matching capacitances is that one end of 1/4 wavelength lossless line and series diode one end to pipe are connected respectively with length, length is that the other end of 1/4 wavelength lossless line is connected with the input end of prime amplifier and parallel diode one end to pipe respectively, parallel diode is to the other end ground connection of pipe, the output terminal of prime amplifier is connected with one end of gate controlled switch, the other end of gate controlled switch is connected with the first input end of frequency mixer, the output terminal of frequency mixer is connected with the input end of analog to digital converter, the output terminal of analog to digital converter is connected with the input end of computing machine, the output terminal of computing machine is connected with the input end of radio-frequency signal source, the output terminal of radio-frequency signal source is connected with the second input end of frequency mixer and the input end of sampling switch respectively, the output terminal of sampling switch is connected with the input end of power amplifier, the output terminal of power amplifier is connected with the other end of series diode to pipe,
5th step, under control of the computer, power amplifier exports CPMG pulse train, electric magnetization is carried out to insulator sample, the magnetic resonance induction deamplification produced is after prime amplifier, frequency mixer and analog to digital converter process successively, orthogonal phase sensitive detection is completed by computing machine, obtain real part and the imaginary part frequency response component of magnetic resonance signal, further Laplace transform is carried out to signal, obtain the T2 distribution profile of sample.By height, the parameter such as position and area coverage of each root characteristic spectral line on observation and analysis spectrogram, and contrast with normal data, realize the judgement to the Ageing of Insulators degree.
The invention provides a kind of permanent magnet, this magnet can not only detect the Degree of Ageing of insulator, and the magnetic field homogeneity of sample detection target area can be improved, and there is lower stray magnetic field, the uniformity of magnetic field overcoming existing the Ageing of Insulators degree magnetic resonance detection magnet is not high, and stray magnetic field is on the impact of surrounding environment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is metering circuit structural representation of the present invention;
Fig. 3 is that 12 cube shaped magnet submodules 1 of the present invention overlook the magnetic field structure schematic diagram on direction;
Fig. 4 is the structural representation in the magnetic field of magnetizing of cube shaped magnet submodule 1 of the present invention.
Embodiment
The sample aging degree pick-up unit of a kind of insulator, comprise detected insulator sample 17, magnetic test coil 15 and 12 magnetizing directions and all identical cube shaped magnet submodule 1 of the intensity that magnetizes, the cube shaped magnet submodule 1 that 12 volumes are identical be to wait radian compartment of terrain be distributed on same circumferentially, if choose the magnetizing direction X of one of them cube shaped magnet submodule 1 as benchmark, circumferentially same at this, the magnetizing direction of each cube shaped magnet submodule arranged successively along clockwise direction rotates 60 degree successively along clockwise direction, the home position of uniform this same circumference place circle of 12 cube shaped magnet submodules 1 is provided with magnetic test coil 15, the central shaft of magnetic test coil 15 is provided with detected insulator sample 17, one end ground connection of magnetic test coil 15, the other end of magnetic test coil 15 is connected with one end of impedance matching capacitances 16, frequency tuning electric capacity 3 is parallel with at the two ends of magnetic test coil 15, the other end of impedance matching capacitances 16 is that one end of 1/4 wavelength lossless line 4 and series diode one end to pipe 7 are connected respectively with length, length is that the other end of 1/4 wavelength lossless line 4 is connected with the input end of prime amplifier 5 and parallel diode one end to pipe 6 respectively, parallel diode is to the other end ground connection of pipe 6, the output terminal of prime amplifier 5 is connected with one end of gate controlled switch 10, the other end of gate controlled switch 10 is connected with the first input end of frequency mixer 11, the output terminal of frequency mixer 11 is connected with the input end of analog to digital converter 12, the output terminal of analog to digital converter 12 is connected with the input end of computing machine 14, the output terminal of computing machine 14 is connected with the input end of radio-frequency signal source 13, the output terminal of radio-frequency signal source 13 is connected with the second input end of frequency mixer 11 and the input end of sampling switch 9 respectively, the output terminal of sampling switch 9 is connected with the input end of power amplifier 8, the output terminal of power amplifier 8 is connected with the other end of series diode to pipe 7.
Described detected insulator sample 17 is torus shape, and detected insulator sample 17 is arranged on directly over magnetic test coil 15.
The sample aging degree detection method of a kind of insulator, comprises the following steps:
The first step, the cube shaped magnet submodule 1 choosing the identical magnetic material of 12 volumes identical magnetize, and make the intensity that magnetizes of each cube shaped magnet submodule 1 identical, and magnetizing direction are also identical;
Second step, the radian compartment of terrains such as 12 cube shaped magnet submodules 1 are distributed on same circumferentially, if choose the magnetizing direction X of one of them cube shaped magnet submodule 1 as benchmark, circumferentially same at this, the magnetizing direction of each cube shaped magnet submodule arranged successively along clockwise direction to rotate 60 degree along clockwise direction successively;
3rd step, magnetic test coil 15 is set on the home position of uniform this same circumference place circle of 12 cube shaped magnet submodules 1, detected insulator sample 17 is set directly over the central shaft of magnetic test coil 15;
4th step, by one end ground connection of magnetic test coil 15, the other end of magnetic test coil 15 one end with impedance matching capacitances 16 is connected, the frequency tuning electric capacity 3 in parallel at the two ends of magnetic test coil 15, the other end of impedance matching capacitances 16 is that one end of 1/4 wavelength lossless line 4 and series diode one end to pipe 7 are connected respectively with length, length is that the other end of 1/4 wavelength lossless line 4 is connected with the input end of prime amplifier 5 and parallel diode one end to pipe 6 respectively, parallel diode is to the other end ground connection of pipe 6, the output terminal of prime amplifier 5 is connected with one end of gate controlled switch 10, the other end of gate controlled switch 10 is connected with the first input end of frequency mixer 11, the output terminal of frequency mixer 11 is connected with the input end of analog to digital converter 12, the output terminal of analog to digital converter 12 is connected with the input end of computing machine 14, the output terminal of computing machine 14 is connected with the input end of radio-frequency signal source 13, the output terminal of radio-frequency signal source 13 is connected with the second input end of frequency mixer 11 and the input end of sampling switch 9 respectively, the output terminal of sampling switch 9 is connected with the input end of power amplifier 8, the output terminal of power amplifier 8 is connected with the other end of series diode to pipe 7,
5th step, under control of the computer, power amplifier exports CPMG pulse train, electric magnetization is carried out to insulator sample, the magnetic resonance induction deamplification produced is after prime amplifier, frequency mixer and analog to digital converter process successively, orthogonal phase sensitive detection is completed by computing machine, obtain real part and the imaginary part frequency response component of magnetic resonance signal, further Laplace transform is carried out to signal, obtain the T2 distribution profile of sample; By height, the parameter such as position and area coverage of each root characteristic spectral line on observation and analysis spectrogram, and contrast with normal data, realize the judgement to the Ageing of Insulators degree.
The technical solution adopted for the present invention to solve the technical problems is: choose the cube shaped permanent magnet that 12 length evenly magnetized is identical, its magnetizing direction is all vertical with its length-wise axis, and the intensity that magnetizes is all identical, be arranged in order often propping up permanent magnet 30 degree of angles of being separated by along the circumference that radius is enough large, and often prop up the geometric center of permanent magnet at grade, and the remanent magnetic field direction of often propping up permanent magnet rotates orientation successively according to 60 degree of phase differential, due to the mutual superposition of single magnets magnetic fields, will be inner at permanent magnet array, the uniform magnetic field perpendicular to array axis direction is produced near its geometric center plane, and the region beyond array, comprise above and below array, magnetic field intensity is almost nil, reach the requirement to main field homogeneity when the magnetic resonance of the Ageing of Insulators degree detects, the surrounding magnetic field of main magnet is almost nil simultaneously.
The invention has the beneficial effects as follows, detect magnet used with other the Ageing of Insulators degree magnetic resonance to compare, the magnetic field intensity space distribution of array magnet structure is more even, the stray magnetic field of magnet outside is very faint simultaneously, and for the ease of the loading of tested insulator, cubic type magnet array can be divided into two parts and can machinery folding be realized.
In the embodiment shown in fig. 1, magnet array is made up of along a circumferential arrangement 12 submodules 1, centered by the round dot of described circumference, between each submodule 1 center and circumference round dot, the angle of line is 30 degree, if with the magnetization intensity vector of the top submodule 1 for benchmark, in counter clockwise direction, the direction of each submodule 1 magnetization intensity vector rotates 60 degree successively.In fig. 2, the magnetization intensity vector direction of single submodule 1 is shown.
During actual detection, first plane monitoring-network coil 15 level is put into circular ring type magnet, then tested insulator sample 17 is placed on its top position near magnetic test coil, run a spin-echo sequence by testing circuit and pass to shown magnetic test coil, sample 17 is excited, later the induced magnetism resonance signal produced after testing coil 15,1/4 wavelength line 4 is transferred to the pre-amplifier section 5 of testing circuit, carry out follow-up signal transacting successively, finally process related data on computer 14 and display measurement result.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if of the present invention these change and modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (1)
1. the sample aging degree detection method of insulator, comprises the following steps:
The first step, the cube shaped magnet submodule (1) choosing the identical magnetic material of 12 volumes identical magnetize, and make the intensity that magnetizes of each cube shaped magnet submodule (1) identical, and magnetizing direction are also identical;
Second step, the radian compartment of terrains such as cube shaped magnet submodule (1) identical for magnetic material identical for 12 volumes are distributed on same circumferentially, if choose the magnetizing direction (X) of one of them cube shaped magnet submodule (1) as benchmark, circumferentially same at this, the magnetizing direction of each cube shaped magnet submodule arranged successively along clockwise direction rotates 60 degree successively along clockwise direction;
3rd step, magnetic test coil (15) is set on the home position of uniform this same circumference place circle of the cube shaped magnet submodule (1) that the magnetic material that 12 volumes are identical is identical, detected insulator sample (17) is set directly over the central shaft of magnetic test coil (15);
4th step, by one end ground connection of magnetic test coil (15), the other end of magnetic test coil (15) one end with impedance matching capacitances (16) is connected, frequency tuning electric capacity (3) in parallel at the two ends of magnetic test coil (15), the other end of impedance matching capacitances (16) is that one end of 1/4 wavelength lossless line (4) and series diode are connected the one end of managing (7) respectively with length, length is that the other end of 1/4 wavelength lossless line (4) is connected the one end of managing (6) with the input end of prime amplifier (5) and parallel diode respectively, parallel diode is to the other end ground connection of pipe (6), the output terminal of prime amplifier (5) is connected with one end of gate controlled switch (10), the other end of gate controlled switch (10) is connected with the first input end of frequency mixer (11), the output terminal of frequency mixer (11) is connected with the input end of analog to digital converter (12), the output terminal of analog to digital converter (12) is connected with the input end of computing machine (14), the output terminal of computing machine (14) is connected with the input end of radio-frequency signal source (13), the output terminal of radio-frequency signal source (13) is connected with the second input end of frequency mixer (11) and the input end of sampling switch (9) respectively, the output terminal of sampling switch (9) is connected with the input end of power amplifier (8), the output terminal of power amplifier (8) is connected the other end of managing (7) with series diode,
5th step, under control of the computer, power amplifier exports CPMG pulse train, electric magnetization is carried out to insulator sample, the magnetic resonance induction deamplification produced is after prime amplifier, frequency mixer and analog to digital converter process successively, orthogonal phase sensitive detection is completed by computing machine, obtain real part and the imaginary part frequency response component of magnetic resonance signal, further Laplace transform is carried out to signal, obtain the T2 distribution profile of sample; By the height of each root characteristic spectral line on observation and analysis spectrogram, position and area coverage parameter, and contrast with normal data, realize the judgement to the Ageing of Insulators degree.
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| CN106501297A (en) * | 2016-10-17 | 2017-03-15 | 国网重庆市电力公司电力科学研究院 | A kind of NMR measuring system for the detection of composite insulator degree of aging |
| CN107402225A (en) * | 2017-07-07 | 2017-11-28 | 云南电网有限责任公司大理供电局 | Radio-frequency electromagnetic relaxation behavior measuring system |
| FR3081554B1 (en) | 2018-05-23 | 2021-05-21 | Electricite De France | NON-DESTRUCTIVE CONTROL PROCESS OF ELASTOMERIC INSULATING SHEATH OF CABLE, DEVICE AND PROGRAM |
| EP3618117B1 (en) * | 2018-08-30 | 2022-05-11 | Nokia Solutions and Networks Oy | Apparatus comprising a first and second layer of conductive material and methods of manufacturing and operating such apparatus |
| CN112945942B (en) * | 2021-02-02 | 2023-10-27 | 国网山西省电力公司电力科学研究院 | Insulator pollution degree testing method |
| CN115420765B (en) * | 2022-09-02 | 2023-04-25 | 国网湖北省电力有限公司超高压公司 | Composite insulator aging nuclear magnetic relaxation spectrum characteristic spectrum searching and analyzing method |
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| 基于核磁共振原理的复合绝缘子老化问题研究;徐征 等;《高压电器》;20120331;第48卷(第3期);21-24 * |
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| CN103558241A (en) | 2014-02-05 |
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