CN107505548A - A kind of type local-discharge ultrasonic localization method based on flexible array sensor - Google Patents
A kind of type local-discharge ultrasonic localization method based on flexible array sensor Download PDFInfo
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- CN107505548A CN107505548A CN201710757296.5A CN201710757296A CN107505548A CN 107505548 A CN107505548 A CN 107505548A CN 201710757296 A CN201710757296 A CN 201710757296A CN 107505548 A CN107505548 A CN 107505548A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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
- G01R31/1209—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 using acoustic measurements
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Abstract
A kind of type local-discharge ultrasonic localization method based on flexible array sensor, methods described gather ultrasonic signal using flexible array sensor in the outer surface for being detected electrical equipment；Then the radiation direction in global coordinate system is converted to the radiation direction in local coordinate system by Euler's transformation；Dimensionality reduction MUSIC algorithms are used again, try to achieve the estimate of partial discharge source azimuth angle and the angle of pitch；And then according to the coordinate of the estimate and known sensor, determine the line of sensor and partial discharge source；Sensor is finally asked to obtain the exact position in partial discharge source in the intersection point of multiple measurement positions and partial discharge source line.The present invention is detected the ultrasonic signal in electrical equipment using the collection of flexible array sensor, ensure that each array element can be with the surface good fit of electrical equipment, solve the accurate test problems in arbitrary shape local discharge of electrical equipment source well, judge to provide effective way for the analysis of the device interior failure order of severity.
Description
Technical field
The present invention relates to a kind of method for the partial discharges fault that can accurately detect in electrical equipment, belong to detection technique
Field.
Background technology
For baroque electrical equipment, insulation degradation degree depends not only on shelf depreciation type, discharge source
Number, discharge energy size, but also it is closely related with discharge position.Therefore extremely it is necessary the electric discharge to inside electric appliance
Source position is detected, to analyze the order of severity for judging its internal fault.
Shelf depreciation supersonic array detection method is that sensor array and array signal process technique are applied into local put
A kind of new method in electric ultrasound detection, its general principle are surpassed using sensor array detection inside electric appliance shelf depreciation
Acoustical signal, Mutual coupling and space orientation are realized using array signal process technique, the detection success rate of this method and fixed
Position precision is higher, has good development prospect.
Existing ultrasound array sensor is all planar array sensor, is only applicable to the electrical equipment that surface is plane,
And when the surface of electrical equipment is not plane, the part array element of sensor array can not well paste with the surface of electrical equipment
Close, this sensor array just can not be detected.Therefore the accurate inspection to any local discharge of electrical equipment source how is realized
Surveying just turns into the problem that relevant scholar faces.
The content of the invention
It is an object of the invention to the drawback for prior art, there is provided a kind of partial discharge based on flexible array sensor surpasses
Acoustic fix ranging method, arbitrary shape local discharge of electrical equipment source is accurately positioned with realizing.
Problem of the present invention is realized with following technical proposals：
A kind of type local-discharge ultrasonic localization method based on flexible array sensor, methods described are existed using flexible array sensor
It is detected the outer surface collection ultrasonic signal of electrical equipment；Then by Euler's transformation by the radiation direction in local coordinate system
Be converted to the radiation direction in global coordinate system；Dimensionality reduction MUSIC algorithms are used again, try to achieve partial discharge source azimuth angle and the angle of pitch
Estimate；And then according to the coordinate of the estimate and known sensor, determine the line of sensor and partial discharge source；Finally seek sensing
Device obtains the exact position in partial discharge source in the intersection point of multiple measurement positions and partial discharge source line.
The above-mentioned type local-discharge ultrasonic localization method based on flexible array sensor, the described method comprises the following steps：
A. ultrasonic signal is gathered in the outer surface for being detected electrical equipment using flexible array sensor：
X (t)=gikA(Θ)S(t)+N(t)
In formula, X (t) is that snapshot data vector is tieed up in M × 1 of array, and N (t) is that noise data vector, S (t) are tieed up in array M × 1
For the n dimensional vector n of N × 1 of spacing wave, A is the M × N-dimensional steering vector in space, gikIt is i-th of array element in local coordinate system to kth
The polarised direction figure (or gain) of individual signal, i=1 ... .M, k=1 ... .N, wherein M are element number of array, and N is partial discharge source number；
B. the polarised direction figure by i-th of array element in local coordinate system to k-th of signalCorresponding array element office
Portion's radiation directionThat is the angle of pitch and azimuth between i-th of array element and k-th of partial discharge source are converted to world coordinates
Polarised direction figure of i-th of the array element to k-th of signal in systemCorresponding array element overall situation radiation direction
(i) by array element partial radiation direction by the polar coordinates in local coordinate systemIt is converted into rectangular co-ordinate
(xik′,yik′,zik′)；
(ii) by (xik′,yik′,zik') Euler is converted into the rectangular co-ordinate (x in global coordinate system to process three timesik,
yik,zik)；
(iii) by (xik,yik,zik) it is converted into the polar coordinates in global coordinate system
C. direction finding is carried out to shelf depreciation source of ultrasound signal：
Array signal X (t) is subjected to covariance matrix calculating：
R=X (t) X (t)H=ESDSES H+EnDnEn H
Wherein ES、EnRepresentation signal subspace and noise subspace respectively, DS、DnRespectively ESAnd EnCorresponding characteristic value
Diagonal matrix,
Construct traditional two-dimentional MUSIC spaces spectral function：
In formula：It is the column vector in x-axis, and It is the column vector in y-axis,
AndD is array element spacing；λ is wavelength；
It is rightSpectral peak scan for, obtain azimuth and the pitching of N number of array element corresponding to the k of partial discharge source
Optimal one in angle, as the azimuth angle theta of sensor arraykAnd the angle of pitchEstimateWith
D. basisWithAnd the coordinate of known sensor, determine the equation of sensor and partial discharge source line；
E. change the position of sensor, repeat above-mentioned direction finding process twice, obtain two other sensor and connect with partial discharge source
The equation of line, then the intersection point of three lines is the position in partial discharge source.
The above-mentioned type local-discharge ultrasonic localization method based on flexible array sensor, the flexible array sensor include flexible base
Seat and multiple array elements, the both ends of the flexible base by magnet adsorption on the outer surface of electrical equipment is detected, flexible base
Seat middle part is provided with the array element through hole by quadrate array arrangement, and an array element, the survey of each array element are installed in each array element through hole
Amount end is attached on the outer surface of detected electrical equipment, and the signal output part of array element passes through data line and data acquisition device
Connection.
The above-mentioned type local-discharge ultrasonic localization method based on flexible array sensor, the array element through hole row in the middle part of the flexible base
Arrange into 3 × 3 quadrate array.
The above-mentioned type local-discharge ultrasonic localization method based on flexible array sensor, the material of the flexible base are moulded for thermoplasticity
Material, memorial alloy or silicon rubber.
The above-mentioned type local-discharge ultrasonic localization method based on flexible array sensor, passes through spiral shell between the flexible base and array element
Line coordinates.
The present invention is detected the ultrasonic signal in electrical equipment using the collection of flexible array sensor, ensures each array element
Can solve the accurate detection in arbitrary shape local discharge of electrical equipment source well with the surface good fit of electrical equipment
Problem, judge to provide effective way for the analysis of the device interior failure order of severity.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is Eulerian coordinates shift process figure；
Fig. 2 is that (Regional Representative's array of 9 stain compositions passes flexible ultrasonic sensor array coating surface schematic diagram in figure
Sensor)；
Fig. 3 is flexible ultrasonic sensor array plane figure schematic diagram；
Fig. 4 is flexible ultrasonic sensor array profile；
Fig. 5 is sensor array scheme of installation (electrical equipment of the round simulation surface imperfection in figure)；
(figure shows the partial discharge source that is measured with dimensionality reduction MUSIC algorithms to star spectrogram when Fig. 6 is shelf depreciation direction finding
Direction is the angle of pitch and azimuth)；
Fig. 7 is the flow chart of dimensionality reduction MUSIC algorithms；
Fig. 8 be shelf depreciation positioning schematic (three straight lines represent the company between partial discharge source and sensor respectively in figure
Line, the intersection point of three straight lines are the position in partial discharge source).
Each label is expressed as in figure：1. array element, 2. magnet, 3. flexible bases, 4. data acquisition devices, 5. data transfers
Line, 6. flexible array sensors, 7. are detected electrical equipment,
Each symbol is in text：X (t) is that snapshot data vector is tieed up in M × 1 of array, and N (t) is that noise data is tieed up in array M × 1
Vector, S (t) are the n dimensional vector n of N × 1 of spacing wave, and A is the M × N-dimensional steering vector in space,For in local coordinate system
For i-th of array element to the polarised direction figure (or gain) of k-th of signal, i=1 ... .M, k=1 ... .N, wherein M are element number of array,
N is partial discharge source number；The polarised direction figure of k-th of signal (is increased for i-th of array element in global coordinate system
Benefit)；To use the array element partial radiation direction of polar coordinate representation in local coordinate system；(xik′,yik′,zik') it is local
The element position represented in coordinate system with rectangular co-ordinate；(xik,yik,zik) it is the battle array represented in global coordinate system with rectangular co-ordinate
First position；To use the array element overall situation radiation direction of polar coordinate representation in global coordinate system；ES、EnRepresentation signal respectively
Space and noise subspace, DS、DnRespectively ESAnd EnCorresponding characteristic value diagonal matrix；For traditional two
Tie up MUSIC spaces spectral function；It is the column vector in x-axis；It is the column vector in y-axis；D is between array element
Away from；The angle of pitch in k-th of partial discharge source respectively in global coordinate system corresponding to array element i and azimuth；λ is wavelength；WithRespectively partial discharge source k azimuth angle thetaskAnd the angle of pitchEstimate；For cost function.
Embodiment
It is an object of the invention to the deficiency for existing ultrasound array sensor application, there is provided one kind is based on flexibility
The localization method of sensor array, any local discharge of electrical equipment source is accurately positioned with realizing.
Problem of the present invention is realized with following technical proposals：
Principle and realize step：
1. the design of flexible array sensor
The flexible type local-discharge ultrasonic sensor array of the present invention includes flexible base 3 of the battle array hole number no less than 3 × 3, magnet
2.The flexible base 3 is provided with nine array element mounting holes of square arrangement, and sonac array element 1 is placed in hole.It is soft
The property rear and front end of pedestal 3 is provided with magnet 2 and fixed plate, and sucker is provided with fixed plate, sensor array element is used magnetic
Or sucker two ways is fixed on electrical equipment surface.
The flexible type local-discharge ultrasonic sensor array assembly uses cuboid groove structure, and its size is：Long 80mm, width
30mm, the depth of groove are 15mm, and a diameter of 5mm, the cylinder hole depth of the cylindrical hole of bottom portion of groove are 5mm, adjacent column hole
Center spacing L be 8mm.For convenience of the making and assembling of the present invention, flexible base structure fixes sensor array using square formation type
Member, place in the array element mounting hole of array element and be provided with screw thread, to fixed sensor array element, the magnet shape of flexible base rear and front end
Shape is the rectangle that the length of side is 5mm*20mm.Flexible base can also use silicon rubber from polyimide material or memorial alloy
Material makes, and the material has good pliability, can be attached to above according to the shape of equipment surface, so that array element energy
It is enough closely to be attached with equipment surface.It is small that sound wave propagates energy loss in thermoplastic or silastic material, also has
The characteristics of anticorrosive, antidetonation and excellent anti-high energy particle penetration capacity.The back side of the flexible array sensor assembly is passed through
Coarse processing, it can make external sound wave that repeatedly refraction occur, so as to reduce influence of the outside noise to testing result.
During installation, nine sonac array elements are placed in the circular hole groove of flexible base first, to ensure to obtain
The higher supersonic array signal of signal to noise ratio avoids the occurrence of it is necessary to ensure close-coupled between sensor and equipment outer wall steel plate as far as possible
The air gap.Before install sensor, polished smooth and wiped with emery cloth in the position of the outer wall setting installation of tank wall model first
Totally, good quality butter then is spread on the steel plate outer wall and sensor array after polishing, then sensor array is close to steel
Plate outer wall is good to ensure to couple between sensor array and steel plate outer wall, and makes flexible array sensor steady using magnet adsorption
Surely the surface of equipment is fixed on, to obtain a stable ultrasonic signal.In addition, the present invention is used to assemble in each array element
Annular gap also is provided with the mounting hole of sensor chip, these gaps can also provide the fine setting of locus, so as to utilizing
The deformation of array element spatially obtains the preferably adhesion with equipment surface.
2. signal model
The mathematical modeling of reception signal, it is under the hypothesis of arrowband, because carrier curvature and element pattern refer in partial discharge source
To difference：
In formula, X (t) is that snapshot data vector is tieed up in M × 1 of array, and N (t) is that noise data vector, S (t) are tieed up in array M × 1
For the n dimensional vector n of N × 1 of spacing wave, A is the M × N-dimensional steering vector in space,K-th is believed for i-th of array element
Number directional diagram (or gain), i=1 ... .M, k=1 ... .N, wherein M are element number of array, and N is partial discharge source number；
In the modeling of traditional planar array steering vector, it has been generally acknowledged that the directional diagram (also referred to as gain) of each array element is protected
Hold unanimously, and crosspolar effect can often ignore generally by formula (1)It is normalized to 1.
In conformal array, directional diagramPointed to and had a great influence by carrier curvature and radiation element.Array element is bent by carrier
The influence of rate, there is the incident angle of different local coordinate systems, i.e. far-field signalIt is different.It is unable in wushu (1)Itd is proposed as common factor.
But in conformal array, due to carrier curvature and the difference of element pattern sensing, we are needed to every in (1)
The directional diagram of individual array elementIt is usual to carry out accurate mathematical modeling, array element directional diagramDefinition and set
Meter is all using local local coordinate system as reference.Therefore, need to solve in the modeling of conformal array steering vector one is closed
Key problem is exactly the global rotation transformation of element pattern(It is in local coordinate system
Directional diagram,It is the directional diagram in global coordinate system).
The conformal line overall situation rectangular coordinate system of Arbitrary 3 D geometry carrier is constructed first with Euler's rotation transformation three times to arrive
The Unified frame of unit local rectangular coordinate system rotation transformation.And based on this, realize conformal array overall situation polar coordinate system
To the Space Rotating conversion and the global rotation transformation of Element Polarization directional diagram of local polar coordinate system.Array element is obtained in world coordinates
Signal gain in system
The incident angle in known partial discharge sourceMake conversion of the global polar coordinate system to global rectangular coordinate system：Again local rectangular coordinates are obtained by Euler's rotation transformation three times：Connect
To utilize and make conversion of the local polar coordinate system to local rectangular coordinate system：Array element is can obtain locally to sit
Antenna pattern vector in mark systemThis is the global conversion for arriving local coordinate of array element：
Then the local antenna pattern of array element is converted into the global antenna pattern of array element： Array element is completed locally to global coordinate transform, the conversion is the inverse transformation of formula (2)
In summary, in assigned directionOn, obtain the far-field pattern of circular polarisation specific steps and method such as
Under：
(1)Polar coordinate representation of the array element in the overall situation is converted into rectangular co-ordinate to represent.
(2)Rectangular co-ordinate of the array element in the overall situation is represented to be converted into by Euler three times
Rectangular co-ordinate in local coordinate system represents.
(3)Rectangular co-ordinate of the array element in local rectangular coordinate system is represented to be converted into local seat
Polar coordinate representation in mark system.
The step of the above three completes array element and is converted to its local polar coordinates in the polar coordinates of the overall situation.
Polar coordinates in the local coordinate system obtained according to step (3)I-th of array element can be determined in its part
Antenna pattern in coordinate system
The local antenna pattern of array element is converted into the antenna pattern of the overall situation.The step
Conversion in rapid is the conversion from local coordinate to world coordinates, is the inverse transformation of step (1) (2) (3).Finally it can obtain the overall situation
Antenna pattern
3. direction-finding method is studied
Array signal X (t) is subjected to covariance matrix calculating：
R=X (t) X (t)H=ESDSES H+EnDnEn H
Wherein ES、EnRepresentation signal subspace and noise subspace respectively, DS、DnRespectively ESAnd EnCorresponding characteristic value
Diagonal matrix,
Construct traditional two-dimentional MUSIC spaces spectral function：
In formula：It is the column vector in x-axis, and It is the column vector in y-axis,
AndD is array element spacing；；λ is wavelength；
It can findK maximum spectral peak corresponding to the azimuth of information source and the estimation of the angle of pitch
Value.Because common MUSIC algorithms need two-dimensional search, its calculate complexity it is higher, calculating speed is slower, direction finding precision compared with
Difference.A kind of arrival direction estimation for needing the dimension-reduction algorithm for carrying out one-dimensional Local Search to carry out partial discharge source is set forth below.
Definition：
αy(u)=[1e-j2πdu/λ…e-j2π(n-1)du/λ]T, αx(v)=[1e-j2πdv/λ…
e-j2π(m-1)dv/λ]T,
The present invention carries out DOA estimations using a kind of need by the one-dimensional DOA estimation method of linear search, makees below detailed
Introduce.
Definition
Formula (4) is also indicated as
Wherein,Above formula is double optimization problem.Consider constraints
e1 Hαx(v)=1, e1=[1,0 ..., 0]T, to eliminate αx(v)=0MIt can reconstruct as follows：
Build following cost functionWherein τ is a constant.
We have：
According to formula (7), ax(v)=μ Q-1(u)e1, wherein μ is a constant.For e1 Hax(v)=1,
AndIt can be obtained by following formula：
By a in (8) formulat(θ) is brought intoIn, then the DOA estimations in partial discharge source can be by following formula
To calculate：
By Local Search, findK peak-peak.K peak-peakIt is correspondingAnd k vector can be obtained by (9) formula
Due to ax(vK)=[1, exp (- j2 π dvk/λ),…,exp(-j2πd(m-1)vk)/λ]T, can obtain：
gK=-angle (ax(vK)) (10)
In formula, angle () is the phase angle of each respective element for compound matrice.gK=[0,2 π dvk/λ,…,(m-
1)2πdvk/λ]T=vkQ, wherein q=[0,2 π d/ λ ..., 2 (m-1) π d/ λ]T。
Then, v is estimated using least square method (LS) principleK, mainly to estimated vector
Normalized, then obtained according to formula (10) by the normalized sequence that is processed
Now, using least square method (LS) principle come estimation orientation angle, θk, least square method (LS) is fitted as follows：
Wherein, ck=[ck0,vk]T∈R2×1It is a unknown parameter vector, ck0It is another estimation parameter.P is：
For ck, according to least square method (LS) principle, solution is：
And azimuth angle thetakAnd the angle of pitchEstimated by following formula：
Above is one-dimensional DOA estimation method principles and methods.The azimuth angle theta tried to achieve more thankAnd the angle of pitchIt is available
Partial discharge source position is obtained in multi-platform cross bearing, and principle is as follows：Obtain the direction of signal, it is known that the coordinate of sensor, therefore
The equation of sensor and partial discharge source line is tested it was determined that changing sensing station, can obtain two other straight line,
Three straight line intersection points are the position in partial discharge source.In actual applications, if causing three straight lines can not phase because of measurement error
Meet at and certain o'clock to the position that the point most short apart from sum of three straight lines is partial discharge source in space a bit, may be selected.
This method is that conformal supersonic array is introduced to the Position Research in electrical equipment partial discharge source first.It is oriented in conformal array
Solves the global rotation transformation of element pattern in Vector Modeling based on Euler's transformation.Avoid because array signal polarization characteristic is led
Cause the deviation to positioning result caused by the orientation estimation of incoming signal.By arrival direction estimation dimensionality reduction in traditional Direction Finding Algorithm
Into one-dimensional.
It is flexible ultrasonic array signal process provides the method for relatively simple solution array signal multipolarization characteristic
Processing provide thinking.
Claims (6)
1. a kind of type local-discharge ultrasonic localization method based on flexible array sensor, it is characterized in that, methods described utilizes flexible array
Sensor gathers ultrasonic signal in the outer surface for being detected electrical equipment；Then by Euler's transformation by local coordinate system
Radiation direction is converted to the radiation direction in global coordinate system；Use dimensionality reduction MUSIC algorithms again, try to achieve partial discharge source azimuth angle and
The estimate of the angle of pitch；And then according to the coordinate of the estimate and known sensor, determine the line of sensor and partial discharge source；Most
Sensor is asked to obtain the exact position in partial discharge source in the intersection point of multiple measurement positions and partial discharge source line afterwards.
2. a kind of type local-discharge ultrasonic localization method based on flexible array sensor according to claim 1, it is characterized in that, institute
The method of stating comprises the following steps：
A. ultrasonic signal is gathered in the outer surface for being detected electrical equipment using flexible array sensor：
X (t)=gikA(Θ)S(t)+N(t)
In formula, X (t) is that snapshot data vector is tieed up in M × 1 of array, and N (t) is that noise data vector is tieed up in array M × 1, and S (t) is sky
Between signal the n dimensional vector n of N × 1, A is the M × N-dimensional steering vector in space, gikK-th is believed for i-th of array element in local coordinate system
Number polarised direction figure (or gain), i=1 ... .M, k=1 ... .N, wherein M are element number of array, and N is partial discharge source number；
B. the polarised direction figure by i-th of array element in local coordinate system to k-th of signalCorresponding array element part spoke
Penetrate directionThat is the angle of pitch and azimuth between i-th of array element and k-th of partial discharge source are converted in global coordinate system
Polarised direction figure of i-th of the array element to k-th of signalCorresponding array element overall situation radiation direction
(i) by array element partial radiation direction by the polar coordinates in local coordinate systemIt is converted into rectangular co-ordinate (xik′,
yik′,zik′)；
(ii) by (xik′,yik′,zik') Euler is converted into the rectangular co-ordinate (x in global coordinate system to process three timesik,yik,
zik)；
(iii) by (xik,yik,zik) it is converted into the polar coordinates in global coordinate system
C. direction finding is carried out to shelf depreciation source of ultrasound signal：
Array signal X (t) is subjected to covariance matrix calculating：
R=X (t) X (t)H=ESDSES H+EnDnEn H
Wherein ES、EnRepresentation signal subspace and noise subspace respectively, DS、DnRespectively ESAnd EnCorresponding characteristic value is diagonal
Matrix,
Construct traditional two-dimentional MUSIC spaces spectral function：
In formula：It is the column vector in x-axis, and It is the column vector in y-axis,
AndD is array element spacing；λ is wavelength；
It is rightSpectral peak scan for, obtain N number of array element corresponding to the k of partial discharge source azimuth and the angle of pitch in most
Excellent one, as the azimuth angle theta of sensor arraykAnd the angle of pitchEstimateWith
D. basisWithAnd the coordinate of known sensor, determine the equation of sensor and partial discharge source line；
E. change the position of sensor, repeat above-mentioned direction finding process twice, obtain two other sensor and partial discharge source line
Equation, then the intersection point of three lines is the position in partial discharge source.
3. a kind of type local-discharge ultrasonic localization method based on flexible array sensor according to claim 1 or 2, its feature
It is that the flexible array sensor (6) includes flexible base (3) and multiple array elements (1), and the both ends of the flexible base (3) lead to
Magnet (2) absorption is crossed on the outer surface of electrical equipment (7) is detected, flexible base (3) middle part is provided with is arranged by quadrate array
The array element through hole of cloth, installs an array element (1) in each array element through hole, the measurement end of each array element (1) be attached to be detected it is electric
On the outer surface of equipment (7), the signal output part of array element (1) is connected by data line (5) with data acquisition device (4).
4. a kind of type local-discharge ultrasonic localization method based on flexible array sensor according to claim 3, it is characterized in that, institute
The array element arrays of openings in the middle part of flexible base (3) is stated into 3 × 3 quadrate array.
5. a kind of type local-discharge ultrasonic localization method based on flexible array sensor according to claim 4, it is characterized in that, institute
The material for stating flexible base (3) is thermoplastic, memorial alloy or silicon rubber.
6. a kind of type local-discharge ultrasonic localization method based on flexible array sensor according to claim 5, it is characterized in that, institute
State and coordinated between flexible base (3) and array element (1) by screw thread.
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| CN108051717A (en) * | 2018-02-24 | 2018-05-18 | 平顶山学院 | Substation's shelf depreciation automatic positioning method |
| CN108204892A (en) * | 2018-01-24 | 2018-06-26 | 重庆邮电大学 | Roller set equipment fault detection method based on array-type flexible pressure sensor |
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| CN108761279A (en) * | 2018-03-23 | 2018-11-06 | 广东电网有限责任公司东莞供电局 | A kind of polar grid searching method and system for Partial Discharge Sources positioning |
| CN108776288A (en) * | 2018-07-25 | 2018-11-09 | 杭州顿恒科技有限公司 | A kind of novel local On-line Discharge monitoring device based on wireless aware |
| CN110148518A (en) * | 2019-06-18 | 2019-08-20 | 天津大学 | The magnet array and preparation method thereof in customized enhancing magnetic field |
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| CN110907778A (en) * | 2019-12-12 | 2020-03-24 | 国网重庆市电力公司电力科学研究院 | GIS equipment partial discharge ultrasonic positioning method, device, equipment and medium |
| CN113030671A (en) * | 2021-04-23 | 2021-06-25 | 应急管理部沈阳消防研究所 | Electrical equipment partial discharge fault on-site detection and positioning device and method |
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| CN113030671A (en) * | 2021-04-23 | 2021-06-25 | 应急管理部沈阳消防研究所 | Electrical equipment partial discharge fault on-site detection and positioning device and method |
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