CN103969560A - Visual ultrasonic detection system for partial discharge failure detection - Google Patents
Visual ultrasonic detection system for partial discharge failure detection Download PDFInfo
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Abstract
The invention relates to a visual ultrasonic detection system for partial discharge failure detection. The system is characterized in that an ultrasonic sensor array is firstly adopted to acquire ultrasonic signals generated by power equipment, and ultrasonic intensity space distribution is evaluated; and meanwhile, video signals are acquired on the scene, and the ultrasonic intensity space distribution is visualized on the basis of the acquired ultrasonic signals and video signals, thereby visually displaying the space position of the partial discharge point as an ultrasonic source. By researching the partial discharge failure detection of the power equipment and designing the visual ultrasonic detection according to the distribution characteristics of the generated ultrasonic signals in the time domain and frequency domain, the system can detect the partial discharge phenomenon in the power equipment at high precision.
Description
Technical field
The present invention relates to the fault detect field of power equipment, particularly a kind of visual ultrasonic wave detecting system for fault detection of local discharge.
Background technology
Shelf depreciation is in power equipment, to need a kind of phenomenon of the failure of detecting in time, and it can produce the insulation degradation of equipment, accelerates the process of insulation damages.Avoid in time and remove shelf depreciation, thereby make the normal safe operation of equipment become the thing that power equipment maintainer considers at most, in order to remove this latency phenomenon of the failure, nowadays occurred a lot of online methods that detect partial discharge phenomenon.
It is foundation that the various physical phenomenons of its generation are all take in the detection of shelf depreciation, estimates state, characteristic and the position of electric discharge.In shelf depreciation process, can produce electric pulse, electromagnetic radiation, ultrasound wave, light and product that some are new, and can cause local pyrexia.Correspondingly, can utilize the several different methods such as flash spotting, chemical measure, Infrared Detection Method, ultrahigh frequency detection method, pulse current detection method and ultrasonic Detection Method to put for detection of office.Flash spotting is conducive to location most, but blocked by barrier, affects; The on-line monitoring result reliability of chemical measure is high, but slower to catastrophic discontinuityfailure reaction; Infrared Detection Method is applicable to the superheating phenomenon of checkout equipment external terminal, but is difficult for the internal state of monitoring equipment in service; Ultrahigh frequency detection method can be avoided corona and disturb, and can reflect the intensity of electric discharge, also can react in time, but because electric wave wavelength is very long, be difficult to discharge source to be located to catastrophic discontinuityfailure; Being most widely used of pulse current detection method, also effective, but its survey frequency is low, can not avoid corona in air and disturb, and is not suitable for on-line monitoring.
When shelf depreciation appears in transformer, can be accompanied by the acoustic emission of explosion shape, produce ultrasonic signal, and to surrounding, propagate very soon.Therefore, can utilize ultrasonic signal detection method to position trouble spot.Existing a lot of research institutions both at home and abroad carry out the Partial Discharge Detection research based on ultrasonic at present, yet existing research is intended for the automatic location of shelf depreciation mostly, but its positioning result tends to produce error due to various interference and obstacle, its testing result is not presented to user with visual means yet, and be much the ultrasonic detection equipment based on single-sensor, need manual search sound source position.
Summary of the invention
For the defect described in background technology or deficiency, the object of this invention is to provide a kind of visual ultrasonic wave detecting system for fault detection of local discharge, maintainer can directly observe the position of supersonic source accurately according to the method, and judges the shelf depreciation point of power equipment.
The present invention adopts following scheme to realize: a kind of visual ultrasonic wave detecting system for fault detection of local discharge, it is characterized in that: comprise signals collecting parts and calculate control assembly: signals collecting parts gather ultrasonic signal and vision signal, and these two signal inputs are calculated to control assembly, by calculating control assembly, complete the fusion treatment to above-mentioned two signals, described fusion treatment comprises: the ultrasound intensity information based on each orientation of ultrasonic signal computer memory; Based on vision signal, obtain the scene information in ultrasonic signal space of living in; The scene information in ultrasound intensity information and space is shown jointly, intuitively the supersonic source position of locating and displaying ultrasonic signal.
In an embodiment of the present invention, the collection of described ultrasonic signal and vision signal is to adopt collection plate collection in one ultrasonic, video set; In described ultrasonic, video set, collection plate comprises the ultrasonic sensor array that is integrated on a pcb board, photographing module and is the electric battery of this collection plate power supply; The output terminal of described array of ultrasonic sensors is connected with a multi-channel data acquisition board through an array signal amplification circuit.
In an embodiment of the present invention, described ultrasonic sensor array is comprised of 16 sonacs that are placed in diverse location, and every four sensors form one group of line style battle array, take four groups of line style battle arrays as four limits, forms the square battle array of two dimension.
In an embodiment of the present invention, the long limit of the square battle array of described two dimension is 30cm, and minor face is 20cm.
In an embodiment of the present invention, the distribution in described ultrasound intensity space estimates it is the judgement of the distribution situation in space supersonic source position by ultrasound intensity, by the time delay to each channel signal, superpose, obtain having the beam signal of space directivity, as the formula (1):
(1)
Wherein,
the angle that represents beam position,
represent that orientation angle is
beam signal, i represents channel number, n represents the moment of delay-correlated, N represents the port number that ultrasonic signal gathers,
represent that i passage orientation angle is
time delay;
Beam signal statistics short-time energy to all angles, as the formula (2):
(2)
Wherein
for the T beam energy that orientation angle is θ constantly,
expression is based on T time variation amount constantly;
For three-dimensional pointing wave beam, solid angle pointed can be decomposed into vertical angle and horizontal angle, beam energy can be regarded as vertical angle and points to energy and horizontal angle sensing energy sum, can obtain the energy distribution of each space angle in this way, formation be take horizontal angle and be take the two-dimensional matrix that vertical angle is ordinate as horizontal ordinate, referred to herein as dimensional energy matrix; The two-dimensional space energy matrix generating is got to maximal value, and as sound source position, and centered by this coordinate, this intensity is amplitude, generates two-dimensional Gaussian function, as display matrix, jointly shows with visual scene.
The present invention has advantages of as follows:
(1) adopt ultrasonic sensor array to gather ultrasonic signal, utilize the ultrasound intensity in each orientation in supersonic source location technology estimation space, realize high-precision ultrasound location;
(2) each orientation ultrasound intensity detecting is shown jointly in conjunction with spatial vision scene information, realized the visual detection and location of supersonic source, be very easy to maintainer's observation judgement;
(3) fault detection of local discharge of power equipment is studied, the characteristic distributions of the ultrasonic signal producing for it on time domain and frequency domain, this visual Ultrasonic Detection is designed, can high-precision the partial discharge phenomenon existing in power equipment be detected.
Accompanying drawing explanation
Fig. 1 is the formation schematic diagram of visual ultrasonic detection equipment.
Fig. 2 is the formation schematic diagram of ultrasonic sensor array in visual ultrasonic detection equipment.
Fig. 3 is array signal amplification circuit diagram in visual ultrasonic detection equipment.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, the present embodiment provides a kind of visual ultrasonic wave detecting system for fault detection of local discharge, this system comprises signals collecting parts and calculates control assembly: signals collecting parts gather ultrasonic signal and vision signal, and these two signal inputs are calculated to control assembly, by calculating control assembly, complete the fusion treatment to above-mentioned two signals, described fusion treatment comprises: the ultrasound intensity information based on each orientation of ultrasonic signal computer memory; Based on vision signal, obtain the scene information in ultrasonic signal space of living in; The scene information in ultrasound intensity information and space is shown jointly, intuitively the supersonic source position of locating and displaying ultrasonic signal.
Please continue referring to Fig. 1, in the present embodiment, the collection of above-mentioned ultrasonic signal and vision signal is to adopt collection plate collection in one ultrasonic, video set; In described ultrasonic, video set, collection plate comprises the ultrasonic sensor array that is integrated on a pcb board, photographing module and is the electric battery of this collection plate power supply; The output terminal of described array of ultrasonic sensors is connected with a multi-channel data acquisition board through an array signal amplification circuit.Ultrasonic signal and the video information of digital form are inputted computing machine by USB interface, and settling signal is processed and Presentation Function.Wherein by ultrasonic sensor array, realize the collection of ultrasonic signal, by array signal amplifying circuit, realize the amplification that gathers rear ultrasonic signal, by multi-channel data acquisition board, realize the analog to digital conversion of amplifying rear ultrasonic signal.On this signal acquiring board, also disposing electric battery powers.
The acoustical signal frequency coverage that shelf depreciation produces is very wide, from audible sound scope (about 10kHz to 100kHz).In design, suitable frequency range need be determined within the scope of this, to select sensor type.The ultrasonic propagation attenuation of high band is very serious, is unsuitable for it to carry out remote capture.The propagation characteristic of low-frequency range is good, but can be subject to the interference of audible sound in environment, affects locating effect, thereby the ultrasonic signal considering about 40kHz is suitable for gathering and auditory localization.
Array element distance is relevant with signal frequency, and array sizes determines spatial resolution.Consider that selected ultrasonic frequency is at 40kHz, so array element is apart from should be less than 1/2 of ultrasonic wavelength as far as possible, in conjunction with the requirement to instrument size, determines that array sizes is between 20cm to 30cm.
As shown in Figure 2, ultrasonic sensor array described in the present embodiment utilizes 16 sonacs that are placed in diverse location to form array, every four sensors form one group of line style battle array, take four groups of line style battle arrays as four limits, form the square battle array of two dimension, the long limit of square battle array is 30cm, and minor face is 20cm, the sonac of wherein selecting is the ATR40-10P model of Shanghai Ni Saila company, by this square battle array, can the sound source in two-dimensional space be positioned.
As shown in Figure 3, consider that ultrasonic signal is very serious through long Distance Transmission decay, in this enforcement, designed twin-stage amplifying circuit, every grade adopts negative feedback amplifier circuit, amplify 100 times, utilize Capacitor apart flip-flop between two-stage, the gain amplifier after cascade can reach 10000 times.Here adopt double operational chip AD822, there is high precision, low-power consumption, the characteristic such as rail-to-rail, guaranteed the high s/n ratio output under high-gain condition.Utilize single power supply, voltage range 3-36v, circuit elements device is selected surface mount elements substantially, guarantees miniaturization and low-power consumption.16 sonacs form array, and every four only reach corresponding amplifying circuit forms a module.Four modules are placed in respectively collection plate four limits.Power supply is also needed to take voltage stabilizing measure, reduce to disturb.
Signal input multi-channel data acquisition board after amplification carries out analog to digital conversion, according to ultrasonic frequency bandwidth and sampling law, the signal sampling frequency of each passage need reach 100kHz, port number reaches 16, the USB7646 type data collecting card of having selected Zhong Taiyanchuan company to produce, supports 16 channel parallel collections, and every channel sample rate reaches 100kHz, sampling precision 16 bits, meet above-mentioned requirements.
In the present embodiment, camera is selected sieve skill C270 high definition integrated camera, and resolution reaches 1,000,000 pixels, inner integrated video condensing encoder, camera is powered by USB, and by USB to computing machine transmission of video coded data.
In the present embodiment, this visual ultrasonic detection equipment can be designed to portable equipment, adopt powered battery mode.Consider that ultrasonic circuit supply voltage is at 3-36v, data collecting card supply voltage is 5v, and work total current is 800mA left and right.Therefore system adopts 4 joint 1.2v rechargeable battery power supplies, every joint capacity 2500mAh.After connect 15w boost DC-DC module, keep stable 5v output voltage, be data collecting card and ultrasound acquisition and amplifying circuit module for power supply.
At the Data processing of Ultrasonic Detection, utilize ultrasound intensity space distribution algorithm for estimating, the distribution situation judgement supersonic source position by ultrasound intensity in space.By the time delay to each channel signal, superpose, can obtain having the beam signal of space directivity, as the formula (1):
，N=16 (1)
Wherein,
the angle that represents beam position,
represent that orientation angle is
beam signal, i represents channel number, n represents the moment of delay-correlated, N represents the port number that ultrasonic signal gathers,
represent that i passage orientation angle is
time delay.Beam signal statistics short-time energy to all angles, as the formula (2):
(2)
Wherein
for the T beam energy that orientation angle is θ constantly,
expression is based on T time variation amount constantly.
For three-dimensional pointing wave beam, solid angle pointed can be decomposed into vertical angle and horizontal angle, and beam energy can be regarded as vertical angle and points to energy and horizontal angle sensing energy sum.Can obtain the energy distribution of each space angle in this way, form and take horizontal angle and take the two-dimensional matrix that vertical angle is ordinate as horizontal ordinate, referred to herein as dimensional energy matrix.
The two-dimensional space energy matrix generating is got to maximal value, and as sound source position, and centered by this coordinate, this intensity is amplitude, generates two-dimensional Gaussian function, as display matrix, jointly shows with visual scene.
Every frame video signal and the dimensional energy matrix of camera collection show jointly, and its principle is by vision signal as a setting, and energy matrix shows as prospect, and the numerical value in matrix is larger, and the brightness of demonstration is just larger.
In experiment, utilize electronic ignition gun as supersonic source, be placed in respectively apart from 15 meters of ultrasound partial discharge detectors, 18 meters and 20 meters of, the working condition of testing apparatus, from effect of visualization, system can effectively detect supersonic source within the scope of 20m, and realizes accurately location.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. the visual ultrasonic wave detecting system for fault detection of local discharge, it is characterized in that: comprise signals collecting parts and calculate control assembly: signals collecting parts gather ultrasonic signal and vision signal, and these two signal inputs are calculated to control assembly, by calculating control assembly, complete the fusion treatment to above-mentioned two signals, described fusion treatment comprises: the ultrasound intensity information based on each orientation of ultrasonic signal computer memory; Based on vision signal, obtain the scene information in ultrasonic signal space of living in; The scene information in ultrasound intensity information and space is shown jointly, intuitively the supersonic source position of locating and displaying ultrasonic signal.
2. the visual ultrasonic wave detecting system for fault detection of local discharge according to claim 1, is characterized in that: described ultrasonic signal and the collection of vision signal are to adopt collection plate collection in one ultrasonic, video set; In described ultrasonic, video set, collection plate comprises the ultrasonic sensor array that is integrated on a pcb board, photographing module and is the electric battery of this collection plate power supply; The output terminal of described array of ultrasonic sensors is connected with a multi-channel data acquisition board through an array signal amplification circuit.
3. the visual ultrasonic wave detecting system for fault detection of local discharge according to claim 2, it is characterized in that: described ultrasonic sensor array is comprised of 16 sonacs that are placed in diverse location, every four sensors form one group of line style battle array, take four groups of line style battle arrays as four limits, form the square battle array of two dimension.
4. the visual ultrasonic wave detecting system for fault detection of local discharge according to claim 3, is characterized in that: the long limit of the square battle array of described two dimension is 30cm, and minor face is 20cm.
5. the visual ultrasonic wave detecting system for fault detection of local discharge according to claim 3, it is characterized in that: the distribution in described ultrasound intensity space estimates it is the judgement of the distribution situation in space supersonic source position by ultrasound intensity, by the time delay to each channel signal, superpose, obtain having the beam signal of space directivity, as the formula (1):
(1)
Wherein,
the angle that represents beam position,
represent that orientation angle is
beam signal, i represents channel number, n represents the moment of delay-correlated, N represents the port number that ultrasonic signal gathers,
represent that i passage orientation angle is
time delay;
Beam signal statistics short-time energy to all angles, as the formula (2):
(2)
Wherein
for the T beam energy that orientation angle is θ constantly,
expression is based on T time variation amount constantly;
For three-dimensional pointing wave beam, solid angle pointed can be decomposed into vertical angle and horizontal angle, beam energy can be regarded as vertical angle and points to energy and horizontal angle sensing energy sum, can obtain the energy distribution of each space angle in this way, formation be take horizontal angle and be take the two-dimensional matrix that vertical angle is ordinate as horizontal ordinate, referred to herein as dimensional energy matrix; The two-dimensional space energy matrix generating is got to maximal value, and as sound source position, and centered by this coordinate, this intensity is amplitude, generates two-dimensional Gaussian function, as display matrix, jointly shows with visual scene.
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| CN104375068A (en) * | 2014-11-25 | 2015-02-25 | 国家电网公司 | Visual ultrasonic quick inspection device used for power transmission and distribution line patrolling |
| CN104407276A (en) * | 2014-11-04 | 2015-03-11 | 国网河南省电力公司电力科学研究院 | Signal acquisition device for laboratory partial discharge tests |
| CN105334435A (en) * | 2015-10-23 | 2016-02-17 | 国网山东海阳市供电公司 | Adaptive partial discharge ultrasonic monitoring method based on any array |
| CN105738779A (en) * | 2016-01-26 | 2016-07-06 | 国网上海市电力公司 | Partial discharge detection method based on multi-source image fusion |
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| CN107393283A (en) * | 2017-08-31 | 2017-11-24 | 重庆市通信建设有限公司 | A kind of data acquisition unit and data collecting system |
| CN109490723A (en) * | 2018-11-06 | 2019-03-19 | 红相股份有限公司 | A kind of ultrasonic wave visible detection method and ultrasonic wave Visual retrieval instrument |
| CN110865287A (en) * | 2019-11-27 | 2020-03-06 | 国网重庆市电力公司电力科学研究院 | GIS partial discharge positioning device |
| CN110995821A (en) * | 2019-11-28 | 2020-04-10 | 深圳供电局有限公司 | Power distribution network inspection system based on AI and intelligent helmet |
| CN110995821B (en) * | 2019-11-28 | 2021-05-04 | 深圳供电局有限公司 | Power distribution network inspection system based on AI and intelligent helmet |
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