CN204719179U - A kind of inside transformer shelf depreciation determinator - Google Patents
A kind of inside transformer shelf depreciation determinator Download PDFInfo
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- CN204719179U CN204719179U CN201520351988.6U CN201520351988U CN204719179U CN 204719179 U CN204719179 U CN 204719179U CN 201520351988 U CN201520351988 U CN 201520351988U CN 204719179 U CN204719179 U CN 204719179U
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Abstract
The utility model discloses a kind of inside transformer shelf depreciation determinator, solve existing partial discharge of transformer mensuration and there is the problem that error is large and cost performance is low.Seven sonacs that the end face of cylinder shape sensor mount pad (4) is provided with L shape layout patch groove (5) and sonac (6); Stage clip (7) is provided with between the bottom surface of circular groove (3) and the bottom surface of cylinder shape sensor mount pad (4), the ultrasonic signal extension line (8) of sonac (6) is electrically connected with ultrasound data acquisition device (9) by through hole (11), and ultrasound data acquisition device (9) is connected with computing machine (10); Adopt based on L-type sensor array, use the wideband focusing algorithm of total least square method (TLS) to focus on type local-discharge ultrasonic broadband signal, the azimuth information in source is put in the arrowband Direction Finding Algorithm acquisition office adopting phase matching principle and cloud Optimizing Search to combine.There is the advantage of direction finding precision height and accurate positioning.
Description
Technical field
The present invention relates to a kind of inside transformer shelf depreciation determinator, particularly a kind of inside transformer shelf depreciation determinator and assay method.
Background technology
The detection of partial discharge of transformer with accurately locate for the latency insulation defect of Timeliness coverage inside electric appliance, trouble-saving generation significant.Traditional transformer partial discharge positioning method is when shelf depreciation abnormal occurrence appears in transformer, moved around on transformer outer wall by a sonac, measure the position of inside transformer shelf depreciation point, there is measuring accuracy difference in this measuring method, ineffective problem.Prior art starts to adopt arranges ultrasound array sensor on transformer surface, measure the method for inside transformer shelf depreciation point, it be multiple ultrasonic sensor is arranged on transformer outside surface square or circular, ultrasonic signal is obtained by sensor array, according to the time delay relation between each channel ultrasound signal, obtain the azimuth information of shelf depreciation point, by array signal Direction Finding Algorithm and shelf depreciation point location algorithm, and then it is accurately located.But it is many to there is sensor element number of array in square array ultrasonic sensor, the problem that cost is high; Although circular array ultrasonic sensor arrangement cost performance is high, there is ultrasonic signal and receive the low problem of resolution.In addition, array signal Direction Finding Algorithm is all carry out calculating based on the signal of signal frequency between 142.5kHz to 157.5kHz, and that is, it is a kind of direction finding evaluation method based on narrow band signal; And the frequency of the local discharge signal of electrical equipment is between 50kHz to 400kHz, it is a kind of typical broadband signal, calculate according to array signal Direction Finding Algorithm, the ultrasonic signal caused between 50kHz to 142.5kHz and 157.5kHz to 400kHz is lost, make the position of shelf depreciation point occur the error of calculation, cause location inaccurate.
Summary of the invention
The invention provides a kind of inside transformer shelf depreciation determinator, solve existing partial discharge of transformer mensuration and there is the technical matters that error is large and cost performance is low.
The present invention solves above technical matters by the following technical programs:
A kind of inside transformer shelf depreciation determinator, comprises transformer shell and magnetic support, the end face of magnetic support is fixedly installed four magnet pieces; The center of magnetic support end face is provided with circular groove, in circular groove, is movably set with cylinder shape sensor mount pad; Seven sonacs that the end face of cylinder shape sensor mount pad is provided with L shape layout patch groove, patch in groove be plugged with sonac at sonac; Stage clip is provided with between the bottom surface of circular groove and the bottom surface of cylinder shape sensor mount pad, in the bottom surface central authorities of circular groove, through hole is set, the ultrasonic signal extension line of sonac is electrically connected by through hole and ultrasound data acquisition device, and ultrasound data acquisition device is connected with computing machine; The end face of magnetic support is pulled together with the housing of tested transformer.
Four magnet pieces are evenly arranged on the end face of magnetic support, between the probe and the housing of tested transformer of sonac, be provided with butter layer, and stage clip is by together with the housing of the probe of sonac and transformer tightly apical grafting.
A kind of inside transformer partial discharge positioning method, comprises the following steps:
The first step, on the end face of magnetic support, be fixedly installed four magnet pieces, arrange circular groove in the center of magnetic support end face, in circular groove, activity arranges cylinder shape sensor mount pad; Seven sonacs that the end face of cylinder shape sensor mount pad arranges L shape layout patch groove, patch in groove patch a sonac at each sonac; Between the bottom surface of circular groove and the bottom surface of cylinder shape sensor mount pad, stage clip is set, in the bottom surface central authorities of circular groove, through hole is set, the ultrasonic signal extension line of sonac is electrically connected with ultrasound data acquisition device by through hole, and ultrasound data acquisition device connects computing machine; The end face of magnetic support and the housing of tested transformer are pulled together;
Second step, the output signal of seven ultrasonic sensors of L shape being arranged, first through the denoising of ultrasound data acquisition device, then send computing machine to, form type local-discharge ultrasonic array signal X by computing machine
k;
3rd step, wideband focusing algorithm based on total least square method, by supersonic array broadband signal X
kconvert narrow band signal X to
z;
4th step, the arrowband Direction Finding Algorithm adopting phase matching principle and cloud Optimizing Search to combine obtain position angle and the angle of pitch of shelf depreciation point direction finding line;
5th step, the shelf depreciation location algorithm adopting global optimization to search for, determine the particular location of partial discharge of transformer.
Ultrasound data acquisition device following methods carries out denoising:
First play a game and put supersonic array signal and carry out centralization and get average and white noise pre-service; Then, the blind separation of type local-discharge ultrasonic array signal is carried out; Finally carry out the extraction of type local-discharge ultrasonic signal.
Based on the wideband focusing algorithm of total least square method, by supersonic array broadband signal X
kconvert narrow band signal X to
zthe basic step of conversion is:
(1) the ultrasonic signal initial value after ultrasonic sensor denoising is estimated, and selected reference frequency f
0, construct the array manifold A (f of each Frequency point
0);
(2) focussing matrix of each Frequency point is constructed;
(3) utilize a series of focussing matrix pair array to receive data and carry out focusing transform, obtain the narrow band signal X of single-frequency point
z.
The present invention has the advantages such as operand is little, direction finding precision is high, accurate positioning, fast convergence rate.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that the present invention overlooks the structural representation on direction.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
The invention provides a kind of inside transformer shelf depreciation determinator, comprise transformer shell and magnetic support 1, the end face of magnetic support 1 is fixedly installed four magnet pieces 2; The center of magnetic support 1 end face is provided with circular groove 3, in circular groove 3, is movably set with cylinder shape sensor mount pad 4; Seven sonacs that the end face of cylinder shape sensor mount pad 4 is provided with L shape layout patch groove 5, patch in groove 5 be plugged with sonac 6 at sonac; Stage clip 7 is provided with between the bottom surface of circular groove 3 and the bottom surface of cylinder shape sensor mount pad 4, in the bottom surface central authorities of circular groove 3, through hole 11 is set, the ultrasonic signal extension line 8 of sonac 6 is electrically connected by through hole 11 and ultrasound data acquisition device 9, and ultrasound data acquisition device 9 is connected with computing machine 10; The end face of magnetic support 1 is pulled together with the housing of tested transformer.
Four magnet pieces 2 are uniform on the end face of magnetic support 1, between the probe and the housing of tested transformer of sonac 6, be provided with butter layer, and stage clip 7 is by together with the housing of the probe of sonac 6 and transformer tightly apical grafting.Apparatus of the present invention are easy to carry except having, simple to operate, outside the engineering advantages such as stable performance, also have the following advantages: (1) this device plug and play simultaneously, avoid cannot changing when single-sensor damage or sensitivity decrease, affect whole structure; (2) this device can fix sonac 6 spacing, ensures the consistance that each array element of ultrasound array sensor contacts with electrical equipment outer wall surface and globality.
A kind of inside transformer partial discharge positioning method, comprises the following steps:
The first step, on the end face of magnetic support 1, be fixedly installed four magnet pieces 2; Arrange circular groove 3 in the center of magnetic support 1 end face, in circular groove 3, activity arranges cylinder shape sensor mount pad 4; Seven sonacs that the end face of cylinder shape sensor mount pad 4 arranges L shape layout patch groove 5, patch in groove 5 patch a sonac 6 at each sonac; Stage clip 7 is provided with between the bottom surface of circular groove 3 and the bottom surface of cylinder shape sensor mount pad 4, in the bottom surface central authorities of circular groove 3, through hole 11 is set, the ultrasonic signal extension line 8 of sonac 6 is electrically connected with ultrasound data acquisition device 9 by through hole 11, and ultrasound data acquisition device 9 connects computing machine 10; The end face of magnetic support 1 is pulled together with the housing of tested transformer;
Second step, after ultrasound data acquisition device 9 denoising, send the output signal of seven ultrasonic sensors 6 that L shape is arranged to computing machine 10, form type local-discharge ultrasonic array signal X by computing machine 10
k;
3rd step, convert supersonic array broadband signal X to narrow band signal X based on the wideband focusing algorithm of total least square method
z;
4th step, the arrowband Direction Finding Algorithm adopting phase matching principle and cloud Optimizing Search to combine obtain position angle and the angle of pitch of shelf depreciation point direction finding line;
5th step, the shelf depreciation location algorithm adopting global optimization to search for, determine the particular location of partial discharge of transformer.
According to signal phase matching method, when signal space phase place is identical, just can solve real part and the imaginary part of signal.For avoiding traditional method of exhaustion maximizing arithmetic speed shortcoming slowly, the present invention adopts cloud Optimizing Search algorithm to carry out the search of optimum solution, can the office of obtaining put the azimuth information in source, i.e. the position angle of direction finding line and the angle of pitch.
First ultrasound array sensor is utilized to carry out Partial Discharge Detection at the diverse location of electrical equipment, obtain position angle and the angle of pitch of the direction finding line of every group pattern sensor, and set up space a bit to the equation of each bar direction finding linear distance sum based on the home position of L-type sensor array, the locus in source is put depending on the spatial point office of being that its distance sum minimum value is corresponding.
Following methods denoising used by ultrasound data acquisition device 9:
First play a game and put supersonic array signal and carry out centralization (getting average) and white noise pre-service; Then the blind separation of type local-discharge ultrasonic array signal is carried out; Finally carry out the extraction of type local-discharge ultrasonic signal.
Based on the wideband focusing algorithm of total least square method by supersonic array broadband signal X
kconvert narrow band signal X to
zthe basic step of conversion is:
(1) the ultrasonic signal initial value after ultrasonic sensor 6 denoising is estimated, and selected reference frequency f
0, construct the array manifold A (f of each Frequency point
0);
(2) focussing matrix of each Frequency point is constructed;
(3) utilize a series of focussing matrix pair array to receive data and carry out focusing transform, obtain the narrow band signal X of single-frequency point
z.
By above-mentioned steps, the accurate location of the local discharge of electrical equipment based on L-type sensor array can be realized.The present invention adopts based on L-type sensor array, use the wideband focusing algorithm of total least square method (TLS) to focus on type local-discharge ultrasonic broadband signal, the azimuth information in source is put in the arrowband Direction Finding Algorithm acquisition office adopting phase matching principle and cloud Optimizing Search to combine.Compare with traditional partial discharge positioning method, the present invention has the advantages such as operand is little, direction finding precision is high, accurate positioning, fast convergence rate.
Claims (2)
1. an inside transformer shelf depreciation determinator, comprises transformer shell and magnetic support (1), and the end face of magnetic support (1) is fixedly installed four magnet pieces (2); The center of magnetic support (1) end face is provided with circular groove (3), in circular groove (3), is movably set with cylinder shape sensor mount pad (4); It is characterized in that, seven sonacs that the end face of cylinder shape sensor mount pad (4) is provided with L shape layout patch groove (5), patch in groove (5) be plugged with sonac (6) at sonac; Stage clip (7) is provided with between the bottom surface of circular groove (3) and the bottom surface of cylinder shape sensor mount pad (4), in the bottom surface central authorities of circular groove (3), through hole (11) is set, the ultrasonic signal extension line (8) of sonac (6) is electrically connected by through hole (11) and ultrasound data acquisition device (9), and ultrasound data acquisition device (9) is connected with computing machine (10); The end face of magnetic support (1) is pulled together with the housing of tested transformer.
2. a kind of inside transformer shelf depreciation determinator according to claim 1, it is characterized in that, four magnet pieces (2) are evenly arranged on the end face of magnetic support (1), between the probe and the housing of tested transformer of sonac (6), be provided with butter layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520351988.6U CN204719179U (en) | 2015-05-28 | 2015-05-28 | A kind of inside transformer shelf depreciation determinator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520351988.6U CN204719179U (en) | 2015-05-28 | 2015-05-28 | A kind of inside transformer shelf depreciation determinator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880651A (en) * | 2015-05-28 | 2015-09-02 | 国网山西省电力公司电力科学研究院 | Transformer internal partial discharge determination device and positioning method thereof |
| CN107422231A (en) * | 2017-06-14 | 2017-12-01 | 西安交通大学 | A kind of transformer superfrequency local discharge detection device |
-
2015
- 2015-05-28 CN CN201520351988.6U patent/CN204719179U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880651A (en) * | 2015-05-28 | 2015-09-02 | 国网山西省电力公司电力科学研究院 | Transformer internal partial discharge determination device and positioning method thereof |
| CN107422231A (en) * | 2017-06-14 | 2017-12-01 | 西安交通大学 | A kind of transformer superfrequency local discharge detection device |
| CN107422231B (en) * | 2017-06-14 | 2020-01-31 | 西安交通大学 | transformer ultrahigh frequency partial discharge detection device |
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