CN105548824B - A kind of electrical equipment partial discharge source positioner and localization method - Google Patents
A kind of electrical equipment partial discharge source positioner and localization method Download PDFInfo
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- CN105548824B CN105548824B CN201510871342.5A CN201510871342A CN105548824B CN 105548824 B CN105548824 B CN 105548824B CN 201510871342 A CN201510871342 A CN 201510871342A CN 105548824 B CN105548824 B CN 105548824B
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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
- G01R31/1227—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
- G01R31/1263—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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Abstract
The invention discloses a kind of electrical equipment partial discharge source positioner and localization method, including differential vector sensor, high frequency carrier communication module and analytical equipment；The differential vector sensor is arranged in insulation of electrical installation oil, for gathering discharge information；The high frequency carrier communication module is used to the information that differential vector sensor transmits being sent to analytical equipment；The analytical equipment is arranged in control room, and the information for being gathered to differential vector sensor is analyzed, and draws the specific location in partial discharge source.The present invention has the advantages that simple in structure, easy to use, registration for being positioned to the Partial Discharge Sources in insulation of electrical installation oil.
Description
Technical field
It is particularly a kind of local in insulation of electrical installation oil for detecting the present invention relates to electrical equipment detection technique field
The device and method of discharge position.
Background technology
With China's economic development, the requirement to Power System Reliability is also higher and higher, and electrical equipment is as electric power
Hinge in system, reliability of operation are directly related to the safety and stablization of electric system.Electrical equipment is prolonged
In operational process due to insulation ag(e)ing, overvoltage or insulation of electrical installation layer structure are uneven the problems such as, be easy to cause part
Decreasing insulating, the position of these insulation reductions can take the lead in that various types of electric discharges occur, so as to cause the further of insulation
It is impaired, make inside electric appliance that various short troubles occur.If the initial stage that shelf depreciation can occur in electrical equipment is sent out early
Existing problem, can timely safeguard electrical equipment, so as to avoid the generation of more major break down.
Since the 1980s, detect existing substantial amounts of basic research around local discharge of electrical equipment and application is opened
Send out work.Existing local discharge of electrical equipment localization method mainly has light-seeking method, electrical Location method, extra-high frequency electromagnetic waves to determine
Position method, x-ray excitation positioning mode and ultrasonic wave positioning mode etc..Wherein ultrasonic wave positioning mode is surpassed according to what shelf depreciation generated
The direction of Acoustic Wave Propagation and time determine the spatial position of discharge source, due to its principle is simple, anti-electromagnetic interference capability is strong, into
Sheet is low, can realize direct geometry location, therefore application is relatively broad.
Traditional method is that scalar sound pressure sensor is formed array, phase when reaching each array element by measuring ultrasonic wave
Potential difference recycles certain orientation and location algorithm to realize the positioning in partial discharge source.Scalar sound pressure sensor sensitivity is very low, noiseless
The azimuth information of field, it is impossible to determine target, in sound intensity processing, isotropic noise cannot cancel out each other, and signal-to-noise ratio is relatively low；And
And the ordinary ultrasonic positioner that partial discharge is detected in insulation of electrical installation oil is applied, more due to disturbing, influence of noise is larger,
Sound wave may reflect, and cause to detect the situation with the actual multiple partial discharge sources not being consistent, positioning is caused to fail.
In the ultrasonic vector array element that local discharge of electrical equipment ultrasound vector array positioner in prior art uses
Comprising three piezoelectric velocity sensors and a wireless data acquisition module, local discharge of electrical equipment position can be realized
It is accurately positioned；But it is poor to the corresponding effect of ultrasonic wave high-frequency signal, and when making its center of gravity is required all to must be positioned at
On the centre of sphere, in addition the requirement that size is smaller, higher to density, causes the requirement of its manufacturing process harsh, is not easy to volume production.
The content of the invention
It is an object of the invention to overcome defect in the prior art, provide that a kind of manufacture craft is simple, frequency response effect
Well, pinpoint device can be carried out to partial discharge position in insulation of electrical installation oil, and a kind of electrical equipment office is provided
Put the localization method in source.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
A kind of electrical equipment partial discharge source positioner, including differential vector sensor, high frequency carrier communication module and
Analytical equipment；The differential vector sensor is arranged in insulation of electrical installation oil, for gathering discharge information；The high frequency
Carrier communication module is used to the information that differential vector sensor transmits being sent to analytical equipment；The analytical equipment is arranged on
In control room, the information for being gathered to differential vector sensor is analyzed, and draws the specific location in partial discharge source.
Above-mentioned electrical equipment partial discharge source positioner, the differential vector sensor includes spherical framework, described spherical
Set there are six double laminate patches to bend piezoceramic transducer in framework, six double laminate patch bending piezoceramic transducers pass through respectively
Connecting rod is fixedly connected in spherical framework；The distance of six double laminate patch bending piezoceramic transducer to the centre ofs sphere is equal；It is described
Six double laminate patch bending piezoceramic transducers are divided into three groups, and every group two are located at the same of spherical framework by connecting rod respectively
Diametrically, straight line where three groups of double laminate patch bending piezoceramic transducers is mutually perpendicular to two-by-two on spatial position；It changes positioned at double
Piece bends piezoceramic transducer and gathers double laminate patch bending piezoelectric ceramics sensings with being provided in the connecting rod of spherical framework
The data acquisition module that device Data Concurrent is seen off.
Above-mentioned electrical equipment partial discharge source positioner, the spherical framework include at least three clamping rings, three fixations
Annulus concentric and place plane is mutually perpendicular to two-by-two.
Above-mentioned electrical equipment partial discharge source positioner, each double laminate patch bending piezoceramic transducers pass through two companies respectively
Extension bar is fixedly connected in spherical framework, and the inner end of the six roots of sensation connecting rod at the centre of sphere is connected to each other and is arranged on spherical framework
The centre of sphere, the six roots of sensation connecting rod close to spherical framework outer are separately fixed on spherical framework.
Above-mentioned electrical equipment partial discharge source positioner, the connecting rod are the rectangular body rod of slender type, connecting rod and double laminate patches
It is connected between bending piezoceramic transducer by the convex triangular prism mutually clamped with recessed triangular prism.
Above-mentioned electrical equipment partial discharge source positioner, is additionally provided with two fixed links on the annulus on horizontal plane, and two
Root fixed link is vertically intersected on the centre of sphere.
0.15mm thickness is respectively adopted in above-mentioned electrical equipment partial discharge source positioner, the annulus, connecting rod and fixed link
Silicon steel sheet foil be overrided to form.
Above-mentioned electrical equipment partial discharge source positioner, the high frequency carrier communication module use the transmission line of electricity of electrical equipment
As channel；Power transmission line terminal positioned at electrical equipment side is provided with sender, the sender and differential vector sensor
Pass through wirelessly or non-wirelessly network communication；Power transmission line terminal positioned at control room side is provided with receiver, the receiver and control
Indoor analytical equipment passes through wireless communication.
Above-mentioned electrical equipment partial discharge source positioner, it is described to transmit pusher side and collection of letters pusher side is respectively arranged with trap, coupling
Close capacitor and wave filter.
A kind of electrical equipment partial discharge source localization method, specifically includes following steps：
A. at least three differential vector sensors, three differential vector sensors are put into insulation of electrical installation oil
Positioned at different position；The high frequency carrier communication mould to communicate with differential vector sensor is installed on selected transmission line of electricity
Block；The installing analysis device in control room；
B. the discharge information of differential vector sensor acquisition is sent to analytical equipment through high frequency carrier communication module；
C. orient：X, Y, Z axis is obtained by calculation according to the discharge information that differential vector sensor gathers in analytical equipment
On acoustic pressure gradient and the pressure at the centre of sphere, pass through formula（1）To formula（4）Azimuth is calculatedAnd pitch angle, completion pair
The positioning in partial discharge source；
Formula（1）
Formula（2）
Formula（3）
Formula（4）
D. position：Three-dimensional system of coordinate is established on electrical equipment, three direction finding straight lines is determined by multiple platforms, then passes through
Particle cluster algorithm, which is spatially searched for, a bit, makes the distance of this point to three different surface beelines most short；The point is as partial discharge source
Specific coordinate.
As a result of above technical scheme, the invention technological progress is as follows.
The differential vector sensor of the present invention can be directly placed in insulation of electrical installation oil, communicated by high frequency carrier
Module obtains the shelf depreciation ultrasonic signal in insulation of electrical installation oil, and then completes the positioning to Partial Discharge Sources, has knot
The advantages of structure is simple, easy to make, registration.The differential vector sensor high frequency response effect used in the present invention compared with
Good, double laminate patch bending piezoceramic transducers need not be potted, and be placed directly in insulation of electrical installation oil, can directly be received
To the ultrasonic signal of high-energy, the sensor phase of attenuation and other forms because of caused by the increase of propagation medium is alleviated
Than having significant high s/n ratio advantage, positioning is also more accurate.Compared with traditional single sound pressure sensor, the output of signal
Amount is original four times, and the increase of output information amount substantially improves the performance of target Bearing Estimation；Single differential vector passes
Sensor has directionality, it is already possible to realize comprehensive direction estimation；It is compared with synchronous vibration type vector sensor, differential vector
The sensitivity of sensor increases with the increase of frequency, therefore the survey of the ultrasonic signal for inside electric appliance hyperfrequency
Amount, differential vector sensor have higher sensitivity, there is higher resolution capability to target.
Description of the drawings
Fig. 1 is the structure diagram of differential vector sensor of the present invention；
Fig. 2 is that double laminate patches of the present invention bend piezoceramic transducer and the fillet figure of connecting rod；
Fig. 3 is the structure diagram of connecting rod of the present invention；
Fig. 4 is the structure diagram that double laminate patches of the present invention bend piezoceramic transducer；
Fig. 5 is the principle schematic of high frequency carrier communication module of the present invention；
Fig. 6 is the simulation result figure of the present invention in application process.
Each label is expressed as in figure：1. circle ring rack, 2. connecting rods, 21. convex triangular prisms, 3. pairs of laminate patch bending piezoelectricity potteries
Porcelain sensor, 31. recessed triangular prisms, 4. data acquisition modules, 5. fixed links.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be described in further detail.
The present invention includes differential vector sensor, high frequency carrier communication module and analytical equipment.Differential vector passes
Sensor is arranged in insulation of electrical installation oil, for gathering discharge information；High frequency carrier communication module is used for differential vector
The information of sensor transmissions is sent to analytical equipment；Analytical equipment is arranged in control room, for differential vector sensor
The information of acquisition is analyzed, and draws the specific location in partial discharge source.
Differential vector sensor sets there are six double laminate patches to bend piezoelectric ceramics including spherical framework, in spherical framework
The connection of 3, six data acquisition modules 4 of sensor and fixed double laminate patch bending piezoceramic transducers and data acquisition module
Bar 2.Spherical framework includes at least three clamping rings 1, three clamping rings concentrics, and place plane is mutually perpendicular to two-by-two；
In the present embodiment, spherical framework includes three clamping rings, as shown in Figure 1.
Six double laminate patch bending piezoceramic transducers 3 are fixedly connected on three of spherical framework by connecting rod 2 respectively
In clamping rings, the distance of six double laminate patch bending piezoceramic transducer 3 to the centre ofs sphere is equal.Six double laminate patch bending piezoelectricity potteries
Porcelain sensor is divided into three groups, every group two respectively by connecting rod be located at clamping rings it is same diametrically, it is symmetrical on the centre of sphere,
Straight line where three groups of double laminate patch bending piezoceramic transducers is mutually perpendicular to two-by-two on spatial position.Double laminate patch bending piezoelectricity pass
Sensor is made of a circular metal diaphragm and a circular piezoelectric potsherd bonding, and piezoelectric ceramics on piece has silver electrode, has
Resonance impedance is low, be easy to match external circuit, be easier to apply damping, be simple in structure, performance stabilization the advantages of.Double laminate patch sensors
Metallic membrane and piezoelectric ceramic piece deform upon under external drive, present flexuosity, can increase piezoelectric transducer by
Deformation extent under power state improves transducing sensitivity.
In the present embodiment, each double laminate patch bending piezoceramic transducers 3 are fixedly connected on respectively by two connecting rods 2
In clamping rings, two connecting rods of the same double laminate patch bending piezoceramic transducers 3 of connection are located at the same half of annulus
On footpath, therefore in the present embodiment, connecting rod sets 12 altogether, and the inner end of the six roots of sensation connecting rod 2 wherein at the centre of sphere is connected to each other and sets
The centre of sphere in spherical framework is put, the six roots of sensation connecting rod close to spherical framework outer is separately fixed on clamping rings.
In the present embodiment, connecting rod 2 is the rectangular body rod of slender type, and connecting rod 2 bends piezoceramic transducer with double laminate patches
Between connected by the convex triangular prism mutually clamped with recessed triangular prism, and the angle of recessed triangular prism be more than convex triangular prism angle, specifically
As shown in Fig. 2, in order to have higher sensitivity when double laminate patches are with acoustic vibration.Wherein connecting rod 2 bends piezoelectricity with double laminate patches
The opposite one end of ceramic sensor element is arranged to convex triangular prism 21, and bottom surface isosceles triangle apex angle is 45 degree on convex tri-prismoid,
As shown in figure 3, double laminate patches, which bend the one end opposite with connecting rod of piezoceramic transducers 3, is arranged to recessed triangular prism 31, and recessed three
Bottom surface isosceles triangle apex angle is 90 degree on prism, as shown in Figure 4.
To ensure the stable fastness of spherical framework, the present invention is also provided with two admittedly on the annulus on horizontal plane
Fixed pole 5, two fixed links 5 are vertically intersected on the centre of sphere, as shown in Figure 1.The shape of fixed link is also the rectangular body rod of slender type.
In the present embodiment, density is respectively adopted as 7.75g/cm in annulus, connecting rod and fixed link3Silicon steel material,
The silicon steel sheet foil of 0.15mm thickness is made, is then overrided to form, a diameter of 4mm of annulus.Since silicon steel sheet density is larger,
The spherical framework total quality of composition is larger, stationary state is can be regarded as under ul-trasonic irradiation, and silicon steel sheet belongs to soft magnetism
Material can mitigate magnetic hystersis loss caused by leakage magnetic flux, and the vortex that can reduce leakage magnetic flux generation is overrided to form with thin slice, was prevented
Heat.
Data acquisition module 4 is arranged in the connecting rod 2 of double laminate patch bending piezoceramic transducers and spherical framework,
It is seen off for gathering double laminate patch bending piezoceramic transducer Data Concurrents.
It is realized in the present invention when sending the data of data collecting module collected by high frequency carrier communication module, high frequency carries
Wave communication module installs sender, close by the use of a certain phase transmission line of electricity of electrical equipment as channel in electrical equipment side
Then the transmission line of electricity end installation receiver of control room is propagating channel part both ends installation trap, the coupling of high-frequency signal
Capacitor and wave filter are closed, to realize the transmission of high-frequency signal, the composition of high frequency carrier communication module is as shown in Figure 5.Trap
Setting for limiting the transmission range of signal, coupled capacitor device can isolate height laminate section, and wave filter can make transmission signal
Frequency band passes through, and can also further isolate height laminate section, by this transmission mode can measurement data efficiently, can
That leans on is sent to the outside of electrical equipment.
Differential vector sensor in the present invention carries out according to the following steps in the preparation：
The first step：Determine three axis
The center of circle of annulus is as origin using on horizontal plane, using horizontal from left to right and by the straight line in the center of circle as X-axis, presses
Y-axis and Z axis are determined according to right-hand screw rule.
Second step：Fixed link on X/Y plane is installed
Fixed link on the annulus positioned at X/Y plane is installed, two fixed links is made to be vertically intersected on circle centre position, fixed link
Both ends are separately fixed on the annulus of X/Y plane.
3rd step：Connecting rod on X/Y plane is installed
A piece connecting rod one end is fixed on the center of circle, this root connecting rod is located on the angular bisector of two fixed links, then will
Another connecting rod is fixed on annulus, is in mounted connecting rod on same Radius, and double laminate patches are then bent piezoelectricity
Ceramic sensor element is installed between two connecting rods.
4th step：Installation data acquisition module
Data acquisition module is fixedly mounted in the connecting rod between double laminate patch bending piezoceramic transducers and annulus.
5th step：The 3rd step to the 4th step is repeated, the double laminate patch bending piezoelectricity potteries of the other three are installed on X/Y plane annulus
Porcelain sensor and data acquisition module.
6th step：Annulus in YZ planes is installed, repeats the 3rd step to the 4th step, connecting rod, double laminate patches on Z axis are installed
Sensor and data acquisition module.
7th step：Annulus in XZ planes is installed, makes entire sphere frame more secured.
8th step：In connecting rod and connecting rod and connecting rod with smearing asphalt mixtures modified by epoxy resin on the exposed metal in annulus junction
Fat, you can obtain differential vector sensor.Epoxy resin adhesion strength is strong, can firmly be attached on entire spherical framework,
Dielectric properties are high, can effectively prevent sensor from causing possible internal short-circuit, have dimensional stability, weaken accurate sensing
Device overall dimensions are protected from environmental, therefore can also all apply last layer epoxy resin in all annulus and connecting rod outer layer
It insulate.
The differential vector sensor to be completed using above-mentioned steps, general frame quality are much larger than double laminate patches and bent
Piezoelectricity is made pottery the quality of sensor, can be regarded as static compared with double laminate patches bending piezoelectricity pottery sensor, working band is
50kHz~80 kHz。
The present invention is in use, directly place it in insulation of electrical installation oil, without additional packaging measure, so that
Double laminate patch bending piezoelectricity pottery sensors can be sufficiently exposed in ultrasonic environment.
Positioning carries out according to the following steps：
A. at least three differential vector sensors, three differential vector sensors are put into insulation of electrical installation oil
Positioned at different position；The high frequency carrier communication mould to communicate with differential vector sensor is installed on selected transmission line of electricity
Block；The installing analysis device in control room.
B. the discharge information of differential vector sensor acquisition is sent to analytical equipment through high frequency carrier communication module.Electricity
Partial discharge source in the apparatus insulated oil of gas sends ultrasonic signal, by six double laminate patch bending piezoelectricity potteries of differential vector sensor
Sensor is received, and three differential vector sensors respectively will using high frequency carrier mode by A, B, C three phase line
Sampled data is transferred to analytical equipment.
C. partial discharge source orientation
The discharge information that analytical equipment is gathered according to differential vector sensor can be obtained in X, Y, Z axis by calculating
Acoustic pressure gradient and the centre of sphere at pressure, pass through formula（1）To formula（4）Calculating can obtain azimuthAnd pitch angle, into
And complete the positioning to partial discharge source.Since differential vector sensor size is smaller, can be exported with six acoustic pressures equal
Value replaces the sound pressure signal at the centre of sphere.
Formula（1）
Formula（2）
Formula（3）
Formula（4）
Wherein,,The acoustic pressure measured at X, Y, Z positive axis is represented respectively,,,X, Y are represented respectively, and Z is born
Acoustic pressure at semiaxis.As soon as the acoustic pressure gradient measured to be done to 90 degree of phase-shift processing, obtain and acoustic pressure same-phase is shaken
Fast signal, conversion calculating formula are as follows：
Wherein：For azimuth,For pitch angle, k=, represent wave number,Represent signal angular frequency, c is ultrasonic wave
Spread speed in insulation of electrical installation oil, P are pressure, and x (t) represents signal expression, and r is that double laminate patch center sensors arrive
The distance of the centre of sphere.
It for the differential vector sensor made, can be emulated on MATLAB platforms, demonstrate its orientation
Feasibility.Experimental setup condition：Each double laminate patch bending piezoceramic transducer centre distance centre of sphere 0.001m, incoming signal side
120 degree of parallactic angle, 30 degree of pitch angle, signal-to-noise ratio takes -20dB, using MUSIC algorithms.Simulation result is as shown in fig. 6, wherein azimuth
For 120 degree, pitch angle is 30.5 degree, and the angle that differential vector sensor direction finding spectrogram spectral peak is apparent, and spectrum peak search obtains is missed
Poor also very little, shows that differential vector sensor can realize effective orientation.
D. partial discharge source positions
Analytical equipment establishes three-dimensional system of coordinate on electrical equipment, and partial discharge source is determined using multi-platform method and particle cluster algorithm
Specific location coordinate.
Coordinate at three differential vector sensor centre ofs sphere is respectively（,,), (,,), (,,)；
In a direction finding, the direction finding straight line of three differential vector sensors of process can be obtained；But since angle measurement error etc. is asked
Topic, three straight lines can not often intersect at a point.
For such case, found a bit in space using intelligent search algorithm, make this point between three direction finding lines
Distance it is most short；It is scanned for using particle cluster algorithm, the primary number of population is arranged to 20, is updated using following two formula
The latest position of particle：
In formulaRepresenting j-th of the coordinate of i-th of particle in three dimensions, i takes the integer between 1 to 20, and j takes 1,2,
3；Represent the displacement in particle single iteration；Represent the optimum individual in current particle；Represent the optimal grain in group
Son；,It is 0 to 1 random number；==2, it is Studying factors；W initial values are arranged to 0.8, linearly subtract according to iterations
It is small to 0.2；Using the size range of electrical equipment as the border of each particle position；Maximum iteration is arranged to 1000 times；
The adjacent difference of fitness twice reaches 10-6When terminate；Using the distance of Space Particle to three different surface beelines and as fitness letter
Number.
The search of space partial discharge source position is carried out using multi-platform localization method and particle cluster algorithm, it is fast with search speed,
It is efficient, the simple advantage of algorithm.
Claims (9)
1. electrical equipment partial discharge source positioner, it is characterised in that：Including differential vector sensor, high frequency carrier communication module
And analytical equipment；The differential vector sensor is arranged in insulation of electrical installation oil, for gathering the super of electric discharge generation
Information of acoustic wave；The high frequency carrier communication module is used to the information that differential vector sensor transmits being sent to analytical equipment；
The analytical equipment is arranged in control room, and the ultrasonic signal for being gathered to differential vector sensor is analyzed, and is obtained
Go out the specific location in partial discharge source；
The differential vector sensor includes spherical framework, sets there are six double laminate patches to bend piezoelectricity pottery in the spherical framework
Porcelain sensor (3), six double laminate patch bending piezoceramic transducers (3) are fixedly connected on spherical frame by connecting rod (2) respectively
In structure；The distance of six double laminate patch bending piezoceramic transducer (3) to the centre ofs sphere is equal；
Described six double laminate patch bending piezoceramic transducers are divided into three groups, and every group two are located at spherical frame by connecting rod respectively
Structure it is same diametrically, straight lines where three groups of double laminate patches bending piezoceramic transducers are mutually perpendicular to two-by-two on spatial position；
It is provided with to gather pair laminate patches in connecting rod (2) of double laminate patches bending piezoceramic transducer with spherical framework curved
The data acquisition module (4) that bent piezoceramic transducer Data Concurrent is seen off.
2. electrical equipment partial discharge source positioner according to claim 1, it is characterised in that：The spherical framework at least wraps
Include three clamping rings (1), three clamping rings concentrics and place plane is mutually perpendicular to two-by-two.
3. electrical equipment partial discharge source positioner according to claim 2, it is characterised in that：Each double laminate patch bending piezoelectricity
Ceramic sensor element (3) is fixedly connected on by two connecting rods (2) in spherical framework respectively, the six roots of sensation connecting rod at the centre of sphere
(2) inner end is connected to each other and is arranged on the centre of sphere of spherical framework, and the six roots of sensation connecting rod close to spherical framework outer is separately fixed at
On spherical framework.
4. electrical equipment partial discharge source positioner according to claim 3, it is characterised in that：The connecting rod (2) is thin
The rectangular body rod of elongated, by the convex triangular prism that mutually clamps and recessed between connecting rod (2) and double laminate patch bending piezoceramic transducers
Triangular prism connects.
5. electrical equipment partial discharge source positioner according to claim 4, it is characterised in that：Annulus on horizontal plane
On be additionally provided with two fixed links, two fixed links are vertically intersected on the centre of sphere.
6. electrical equipment partial discharge source positioner according to claim 5, it is characterised in that：The annulus, connecting rod with
And fixed link is respectively adopted the silicon steel sheet foil of 0.15mm thickness and is overrided to form.
7. electrical equipment partial discharge source positioner according to claim 1, it is characterised in that：The high frequency carrier communication mould
Block is using the transmission line of electricity of electrical equipment as channel；Power transmission line terminal positioned at electrical equipment side is provided with sender, described
Sender passes through wirelessly or non-wirelessly network communication with differential vector sensor；Power transmission line terminal positioned at control room side is provided with
Receiver, the receiver is with controlling indoor analytical equipment to pass through wireless communication.
8. electrical equipment partial discharge source positioner according to claim 7, it is characterised in that：It is described to transmit pusher side and the collection of letters
Pusher side is respectively arranged with trap, coupled capacitor device and wave filter.
9. a kind of electrical equipment partial discharge source localization method, which is characterized in that using as described in any one of claim 1-8 right
Electrical equipment partial discharge source positioner, and carry out according to the following steps：
A. at least three differential vector sensors are put into insulation of electrical installation oil, three differential vector sensors are located at
Different position；The high frequency carrier communication module to communicate with differential vector sensor is installed on selected transmission line of electricity；
The installing analysis device in control room；
B. the electric discharge ultrasound information of differential vector sensor acquisition is sent to analytical equipment through high frequency carrier communication module；
C. orient：The sound in X, Y, Z axis is obtained by calculation in the electric discharge ultrasound information gathered according to differential vector sensor
The acoustic pressure size at pressure, that is, centre of sphere at gradient and the centre of sphere is pressed, azimuth angle theta is calculated by formula (1) to formula (4) and is bowed
The elevation angleComplete the positioning to partial discharge source；
▽Px=p1-p2 (2)
▽Py=p3-p4 (3)
▽Pz=p5-p6(4)；
Wherein p1, p3, p5The acoustic pressure measured at X, Y, Z positive axis, p are represented respectively2, p4, p6X, Y are represented respectively, and Z is born at semiaxis
Acoustic pressure.As soon as the acoustic pressure gradient measured to be done to 90 degree of phase-shift processing, obtain and the vibration velocity signal of acoustic pressure same-phase,
It is as follows to convert calculating formula：
Wherein：θ is azimuth,For pitch angle, k=ω/c represent wave number, and ω represents signal angular frequency, and c is ultrasonic wave in electricity
Spread speed in the apparatus insulated oil of gas, P are pressure, and x (t) represents signal expression, and r is double laminate patch center sensors to the centre of sphere
Distance.
The coordinate system is determined by following principle：
Using straight line is reference axis where three groups of double laminate patch bending piezoelectric transducers, wherein on selected level face where one group of sensor
Straight line is X-axis, and straight line where another group of sensor is Y-axis on horizontal plane, and straight line where upper next group of sensor is Z axis, three
Reference axis positive direction meets right-hand screw rule；
D. position：Three-dimensional system of coordinate is established on electrical equipment, three direction finding straight lines is determined by multiple platforms, then passes through particle
Group's algorithm, which is spatially searched for, a bit, makes the distance of this point to three different surface beelines most short；The point is as the specific of partial discharge source
Coordinate.
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| CN106093715B (en) * | 2016-03-17 | 2018-11-27 | 国网江西省电力科学研究院 | A kind of electrical equipment partial discharge source positioning device and localization method |
| CN110108993B (en) * | 2019-05-31 | 2021-05-07 | 国网青海省电力公司检修公司 | Multi-frequency-band three-dimensional combined test method for partial discharge of power equipment |
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