CN202614892U - Transformer partial discharge positioning system - Google Patents
Transformer partial discharge positioning system Download PDFInfo
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- CN202614892U CN202614892U CN 201220270217 CN201220270217U CN202614892U CN 202614892 U CN202614892 U CN 202614892U CN 201220270217 CN201220270217 CN 201220270217 CN 201220270217 U CN201220270217 U CN 201220270217U CN 202614892 U CN202614892 U CN 202614892U
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Abstract
The utility model discloses a transformer partial discharge positioning system and belongs to the technical field of transformer discharge monitoring. The positioning system comprises an ultrahigh frequency sensor, a detection amplifier, an ultrasonic wave sensor array unit, a filter amplifier, a multi-channel synchronous data acquisition unit and a data processor; the ultrahigh frequency sensor is connected with the detection amplifier; the ultrasonic wave sensor array unit is composed of a plurality of ultrasonic wave sensors which are distributed on the same plane; each of the ultrasonic wave sensors is respectively connected with the filter amplifier; the detection amplifier and the filter amplifier are respectively connected with the multi-channel synchronous data acquisition unit; and the multi-channel synchronous data acquisition unit is connected with the data processor. The transformer partial discharge positioning system is fast in positioning speed and accurate in positioning accuracy.
Description
Technical field
The utility model belongs to transformer discharge monitoring technical field, relates in particular to a kind of partial discharge of transformer positioning system.
Background technology
Power transformer is one of key equipment of electric system, and its operational reliability directly affects the safety and stablization of total system.According to incompletely statistics; In the accident of existing record; Accounted for very big ratio by the caused accident of transformer fault; And shelf depreciation is to cause one of power transformer cause faults, also is the important sign and the form of expression of insulation degradation, therefore the further investigation of shelf depreciation has been become gradually the important topic of vast researcher.
Phenomenons such as the electric pulse that existing partial discharge of transformer detection method produces so that shelf depreciation to take place mostly, electromagnetic radiation, light, ultrasound wave are foundation, and corresponding localization method comprises electrical Location method, uhf electromagnetic wave localization method, light-seeking method and ultrasonic locating method etc.
The electrical Location method is put the pulse current that causes through detecting positions such as impedance detection bottom shielding of bushing ground wire owing to office; Obtain the apparent discharge capacity; This method comparative maturity, International Electrotechnical Commission (IEC) has formulated corresponding rules specially, but because this method confirms is the electric position that takes place of shelf depreciation but not locus; And be subject to disturb, seldom adopt in the reality.
The uhf electromagnetic wave localization method obtains shelf depreciation information through the uhf electromagnetic wave signal that detects partial discharge of transformer, and utilizes the time delay relation to realize the location.Usually, in order to obtain more accurate result, select uhf sensor is built-in during on-the-spot test, it is inconvenient to cause equipment to install.
When the light-seeking method propagated on the optical fiber through detecting and extract the shelf depreciation ultrasonic signal, the deformation situation of optical fiber positioned shelf depreciation.Because light signal do not receive electromagnetic interference (EMI), have very high sensitivity, therefore can confirm the position of innings putting the source easily.But because transformer device structure is complicated, how burying optical fiber underground is a present big difficult point, and the resolution of Fibre Optical Sensor can not satisfy requirement of engineering.
The direction of the ultrasonic propagation that the ultrasonic locating method produces during according to shelf depreciation and time confirm that office puts the orientation in source, comprise " electricity-sound " method and " sound-sound " method two class greatly." electricity-sound " method utilizes discharge pulse signal as benchmark, obtains hyperacoustic travel-time, and then draws the distance of discharge source and sensor, but it only obtains space length, also needs additive method auxiliary for the location." sound-sound " method is according to the distance of a plurality of sonacs and discharge source, and the particular location in source is put in definite office through the whole bag of tricks, but because ultrasound wave is very complicated in the inner propagation of transformer; And decay is serious; Cause detection system sensitivity not high, positioning error is bigger, even mistake occurs.
Summary of the invention
The purpose of the utility model is, a kind of partial discharge of transformer positioning system is provided, and is used to solve the problem that existing transformer partial discharge positioning method exists.
To achieve these goals; The technical scheme that the utility model proposes is; A kind of partial discharge of transformer positioning system is characterized in that said positioning system comprises: uhf sensor, detector amplefier, array of ultrasonic sensors unit, filter amplifier, multi-channel synchronous data acquisition device and data processor;
Said uhf sensor links to each other with detector amplefier;
Said array of ultrasonic sensors unit is laid in conplane group of ultrasonic sensors by a plurality of, and each ultrasonic sensor links to each other with filter amplifier respectively;
Said detector amplefier links to each other with the multi-channel synchronous data acquisition device respectively with filter amplifier;
Said multi-channel synchronous data acquisition device links to each other with data processor.
What the distance of adjacent two ultrasonic sensors of said array of ultrasonic sensors unit was a ultrasound wave at the transformer oil medium wavelength is half the.
Said data processor adopts computing machine, notebook or panel computer.
The utility model is through comparing the time domain waveform of ultra-high frequency signal and ultrasonic signal; Confirm the sequential relationship of ultra-high frequency signal and ultrasonic signal; Thereby can accurately obtain the distance between partial discharge of transformer source and the array of ultrasonic sensors unit; Through the position angle and the angle of pitch on estimation partial discharge of transformer source and plane, place, array of ultrasonic sensors unit, obtain the position of partial discharge of transformer source in the space, the method for this associating ultrahigh frequency and ultrasonic technology measuring transformer Partial Discharge Sources again; Locating speed is higher, and bearing accuracy is more accurate.
Description of drawings
Fig. 1 is a partial discharge of transformer positioning system structural drawing;
Fig. 2 is ultrahigh frequency electromagnetic signal and the time domain waveform comparison diagram of selected filtered ultrasonic signal after the detection;
Fig. 3 utilizes Estimation of Spatial Spectrum algorithm estimation partial discharge of transformer source with respect to the position angle on plane, place, array of ultrasonic sensors unit and the synoptic diagram of the angle of pitch.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than scope and application thereof in order to limit the utility model.
Fig. 1 is a partial discharge of transformer positioning system structural drawing.In Fig. 1, the partial discharge of transformer positioning system that the utility model provides comprises: uhf sensor, detector amplefier, array of ultrasonic sensors unit, filter amplifier, multi-channel synchronous data acquisition device and data processor.
Uhf sensor links to each other with detector amplefier.The array of ultrasonic sensors unit is laid in conplane group of ultrasonic sensors by a plurality of, and each ultrasonic sensor links to each other with filter amplifier respectively.When laying the ultrasonic array sensor, for reaching better measurement effect, what the distance that preferably makes adjacent two ultrasonic sensors in the array of ultrasonic sensors unit was a ultrasound wave at the transformer oil medium wavelength is half the.Detector amplefier links to each other with the multi-channel synchronous data acquisition device respectively with filter amplifier.The multi-channel synchronous data acquisition device links to each other with data processor.
The ultrahigh frequency electromagnetic signal that uhf sensor produces when being used to detect transformer generation shelf depreciation, and detected ultrahigh frequency electromagnetic signal is sent to detector amplefier.
Detector amplefier is used to receive the ultrahigh frequency electromagnetic signal that uhf sensor sends, and the ultrahigh frequency electromagnetic signal is carried out being sent to the multi-channel synchronous data acquisition device after the detection.Detector amplefier carries out detection to the ultrahigh frequency electromagnetic signal and comprises that detector amplefier converts the ultrahigh frequency electromagnetic signal that receives into low frequency electromagnetic signals earlier, and the low frequency electromagnetic signals after will changing again amplifies.Detector amplefier carries out detection to the ultrahigh frequency electromagnetic signal to be handled, and helps the multi-channel synchronous data acquisition device and gathers the ultrahigh frequency electromagnetic signal.
The ultrasonic signal that ultrasonic sensor produces when being used to detect transformer generation shelf depreciation, and detected ultrasonic signal is sent to filter amplifier.
Filter amplifier is used to receive the ultrasonic signal that ultrasonic sensor sends, and ultrasonic signal is carried out being sent to the multi-channel synchronous data acquisition device after the filtering.Filter amplifier carries out filtering to ultrasonic signal and comprises that filter amplifier carries out Filtering Processing to the ultrasonic signal that receives earlier, and filtering interference signals amplifies the ultrasonic signal after the Filtering Processing again.Filter amplifier carries out Filtering Processing to ultrasonic signal, helps the multi-channel synchronous data acquisition device and gathers ultrasonic signal.
The multi-channel synchronous data acquisition device is used to receive the filtered ultrasonic signal that ultrahigh frequency electromagnetic signal and filter amplifier after the detection that detector amplefier sends send, and ultrahigh frequency electromagnetic signal and the filtered ultrasonic signal after the detection that receives is sent to data processor.The multi-channel synchronous data acquisition device can specify one of them passage as ultrahigh frequency electromagnetic signal acquisition passage, and remaining passage is used to gather ultrasonic signal.In the remaining passage, each passage is gathered the ultrasonic signal of a ultrasonic sensor detection and the filtering of process filter amplifier.During practical implementation; Uhf sensor and ultrasonic sensor are when sending ultrahigh frequency electromagnetic signal and ultrasonic signal respectively; Can send together with uhf sensor ID and ultrasonic sensor ID; The multi-channel synchronous data acquisition device is sent signal into respective channel according to sensor ID after receiving signal.
Data processor is used to receive and store ultrahigh frequency electromagnetic signal and the filtered ultrasonic signal after the detection that the multi-channel synchronous data acquisition device sends; And, the partial discharge of transformer source is positioned according to ultrahigh frequency electromagnetic signal after the detection and filtered ultrasonic signal.Data processor has the function of reception and storage signal; The function that also has the partial discharge of transformer source location simultaneously; Promptly possesses computing function, so data processor generally adopts computing machine, notebook or panel computer etc. to have the equipment of storage data and data computation ability.
The roughly process of the Partial Discharge Sources of data processor location transformer is:
At first, data processor is chosen the filtered ultrasonic signal of the ultrasonic sensor that is positioned at array of ultrasonic sensors cell geometry center, as selected filtered ultrasonic signal.Through the time domain waveform of the ultrahigh frequency electromagnetic signal behind the comparison detection, confirm the mistiming of ultrahigh frequency electromagnetic signal and ultrasonic signal with the filtered ultrasonic signal of selecting.Fig. 2 is ultrahigh frequency electromagnetic signal and the time domain waveform comparison diagram of selected filtered ultrasonic signal after the detection.Because the aerial velocity of propagation of electromagnetic wave is similar to the light velocity,, can think that the moment that receives the ultrahigh frequency electromagnetic signal is the moment that partial discharge of transformer takes place therefore with respect to ultrasonic signal.With the ultrahigh frequency electromagnetic signal is time reference, and the cooperation through sequential obtains hyperacoustic propagation delay time.Among Fig. 2, t
0The moment that the indication transformer shelf depreciation takes place, t
1The expression sonac receives the moment of ultrasonic signal, and then Δ t is a propagation delay time, and this propagation delay time is the mistiming of ultrahigh frequency electromagnetic signal and ultrasonic signal.
Secondly, according to the mistiming of ultrahigh frequency electromagnetic signal and ultrasonic signal, the distance at calculating transformer Partial Discharge Sources and array of ultrasonic sensors cell geometry center.The distance of calculating transformer Partial Discharge Sources and array of ultrasonic sensors unit specifically adopts formula L=C
Oil* Δ t; Wherein, the distance at L partial discharge of transformer source and array of ultrasonic sensors cell geometry center, C
OilBe ultrasound wave transmitting speed in transformer oil, Δ t is the mistiming of ultrahigh frequency electromagnetic signal and ultrasonic signal.
Next, utilize position angle and the angle of pitch of Estimation of Spatial Spectrum algorithm estimation partial discharge of transformer source with respect to plane, place, array of ultrasonic sensors unit.As shown in Figure 3; Be initial point with any ultrasonic sensor in the array of ultrasonic sensors unit earlier; With plane, place, array of ultrasonic sensors unit is the transverse axis (x axle) and the plane, the longitudinal axis (y axle) place of rectangular coordinate system in space, sets up rectangular coordinate system in space; Choose again and the adjacent ultrasonic sensor of ultrasonic sensor that is positioned at initial point, be designated as the ultrasonic sensor of adjacent initial point; Then according to equation
Estimation partial discharge of transformer source is with respect to the position angle and the angle of pitch on plane, place, array of ultrasonic sensors unit.In the above-mentioned formula (1); β is the phase differential of the detected ultrasonic signal of ultrasonic sensor that is positioned at ultrasonic sensor and the adjacent initial point of initial point; λ is the wavelength of ultrasound wave in transformer oil; X is the horizontal ordinate of the ultrasonic sensor of adjacent initial point, and y is the ordinate of the ultrasonic sensor of adjacent initial point.θ is the position angle of partial discharge of transformer source with respect to plane, place, array of ultrasonic sensors unit, and the electric wave direction that the indication transformer Partial Discharge Sources produces is at the angle of xoy plane projection and x positive axis.
is the angle of pitch of partial discharge of transformer source with respect to plane, place, array of ultrasonic sensors unit, the electric wave direction that the indication transformer Partial Discharge Sources produces and the angle of normal z positive axis.Because being positioned at the path length difference s of ultrasonic sensor of ultrasonic sensor and the adjacent initial point of initial point can be by formula
Confirm, therefore can obtain being positioned at the phase difference beta of ultrasonic sensor of ultrasonic sensor and the adjacent initial point of initial point in view of the above.According to formula (1), can estimate position angle and the angle of pitch of partial discharge of transformer source again with respect to plane, place, array of ultrasonic sensors unit.
At last, distance, the partial discharge of transformer source according to partial discharge of transformer source and array of ultrasonic sensors cell geometry center belongs to the position angle on plane and the position that the angle of pitch is confirmed the partial discharge of transformer source with respect to the array of ultrasonic sensors unit.Owing to calculated the distance of the geometric center of partial discharge of transformer source and array of ultrasonic sensors unit before; Therefore the partial discharge of transformer source must be to be the center of circle in the geometric center with the array of ultrasonic sensors unit, and the distance of the geometric center of partial discharge of transformer source and array of ultrasonic sensors unit is on the ball of radius.Simultaneously, estimated position angle and the angle of pitch of partial discharge of transformer source with respect to plane, place, array of ultrasonic sensors unit.Therefore, the point that satisfies the position angle and the angle of pitch on the ball that can draw, it is actual partial discharge of transformer source.
The above; Be merely the preferable embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion with the protection domain of claim.
Claims (3)
1. a partial discharge of transformer positioning system is characterized in that said positioning system comprises: uhf sensor, detector amplefier, array of ultrasonic sensors unit, filter amplifier, multi-channel synchronous data acquisition device and data processor;
Said uhf sensor links to each other with detector amplefier;
Said array of ultrasonic sensors unit is laid in conplane group of ultrasonic sensors by a plurality of, and each ultrasonic sensor links to each other with filter amplifier respectively;
Said detector amplefier links to each other with the multi-channel synchronous data acquisition device respectively with filter amplifier;
Said multi-channel synchronous data acquisition device links to each other with data processor.
2. what partial discharge of transformer positioning system according to claim 1, the distance that it is characterized in that adjacent two ultrasonic sensors of said array of ultrasonic sensors unit were ultrasound waves at the transformer oil medium wavelength is half the.
3. partial discharge of transformer positioning system according to claim 1 is characterized in that said data processor adopts computing machine, notebook or panel computer.
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|---|---|---|---|
| CN 201220270217 CN202614892U (en) | 2012-06-08 | 2012-06-08 | Transformer partial discharge positioning system |
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| CN 201220270217 CN202614892U (en) | 2012-06-08 | 2012-06-08 | Transformer partial discharge positioning system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707208A (en) * | 2012-06-08 | 2012-10-03 | 华北电力大学（保定） | Positioning system and method of local discharge of transformer |
| CN103399265A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | High voltage cable terminal partial discharge ultrasonic monitor |
| CN103454564A (en) * | 2013-08-22 | 2013-12-18 | 江苏科技大学 | Partial discharge detecting system and method for high voltage switch cabinet |
| WO2015085955A1 (en) * | 2013-12-13 | 2015-06-18 | 上海交通大学 | Parallel connecting method and device for multi-path partial discharge signals |
| CN105974281A (en) * | 2016-05-09 | 2016-09-28 | 中国电力科学研究院 | Detection system and detection method used for positioning partial discharge of voltage transformer |
| CN106154132A (en) * | 2016-08-31 | 2016-11-23 | 国家电网公司 | A kind of GIS partial discharge ultrasound wave superfrequency joint-detection localization method |
| CN115453300A (en) * | 2022-11-11 | 2022-12-09 | 国网江苏省电力有限公司泰州供电分公司 | Partial discharge positioning system and method based on acoustic sensor array |
-
2012
- 2012-06-08 CN CN 201220270217 patent/CN202614892U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707208A (en) * | 2012-06-08 | 2012-10-03 | 华北电力大学（保定） | Positioning system and method of local discharge of transformer |
| CN102707208B (en) * | 2012-06-08 | 2015-04-15 | 华北电力大学（保定） | Positioning system and method of local discharge of transformer |
| CN103399265A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | High voltage cable terminal partial discharge ultrasonic monitor |
| CN103399265B (en) * | 2013-08-13 | 2015-08-19 | 国家电网公司 | A kind of high voltage cable terminal partial discharge ultrasonic monitor |
| CN103454564A (en) * | 2013-08-22 | 2013-12-18 | 江苏科技大学 | Partial discharge detecting system and method for high voltage switch cabinet |
| WO2015085955A1 (en) * | 2013-12-13 | 2015-06-18 | 上海交通大学 | Parallel connecting method and device for multi-path partial discharge signals |
| CN105974281A (en) * | 2016-05-09 | 2016-09-28 | 中国电力科学研究院 | Detection system and detection method used for positioning partial discharge of voltage transformer |
| CN106154132A (en) * | 2016-08-31 | 2016-11-23 | 国家电网公司 | A kind of GIS partial discharge ultrasound wave superfrequency joint-detection localization method |
| CN115453300A (en) * | 2022-11-11 | 2022-12-09 | 国网江苏省电力有限公司泰州供电分公司 | Partial discharge positioning system and method based on acoustic sensor array |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20140608 |