CN101949996A - Ultrasonic sensor used for detecting transformer partial discharge signal - Google Patents
Ultrasonic sensor used for detecting transformer partial discharge signal Download PDFInfo
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- CN101949996A CN101949996A CN2010102394654A CN201010239465A CN101949996A CN 101949996 A CN101949996 A CN 101949996A CN 2010102394654 A CN2010102394654 A CN 2010102394654A CN 201010239465 A CN201010239465 A CN 201010239465A CN 101949996 A CN101949996 A CN 101949996A
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- piezoelectric vibrator
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- metal shell
- partial discharge
- ultrasonic sensor
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Abstract
The invention discloses an ultrasonic sensor used for detecting a transformer partial discharge signal, which can prevent a non-receiving face signal from being introduced and has strong anti-electromagnetic interference performance and high precision. The ultrasonic sensor comprises a metal shell (1), wherein the front end of the metal shell (1) is fixed with a piezoelectric vibrator (2); a protective film (3) is arranged on the front face of the piezoelectric vibrator (2); and the piezoelectric vibrator (2) is connected with an output connector (5) through a signal processing circuit (4). The ultrasonic sensor is characterized in that the piezoelectric vibrator (2) is an axial polarized piezoelectric vibrator, and the two axial ends thereof are plated with metal electrodes (6); the protective film (3) is a ceramic protective film, and the inner surface and the side face of the protective film (3) are plated with metal layers (7); and the metal layer (7) on the inner surface is connected with the metal electrode (6) on the front face of the piezoelectric vibrator (2), and the metal layer (7) on the side face is connected with the metal shell (1).
Description
Technical field:
The present invention relates to a kind of sonac, especially a kind ofly avoids the non-sonac that is used to detect the partial discharge of transformer signal that the face signal imports into, anti-electromagnetic interference performance is strong, degree of accuracy is high of accepting.
Background technology:
The electric field intensity value that the transformer built-in electrical insulation bears along with the raising of electric pressure is very high, is easy to produce shelf depreciation at the insulation weakness.Though this discharge only is present in the local location of insulation, can not form whole insulation connectivity immediately punctures or flashover, but also exist very big harmfulness: the one, make the insulating material of contiguous shelf depreciation be subjected to discharging particle direct bombardment and cause local damage, the 2nd, heat, ozone, nitrogen oxide isoreactivity gas that discharge is produced, it is aging to make minor insulation be subjected to corrosion, for this reason, need in time to find partial discharge of transformer and get rid of.But very faint because of partial discharge quantity, have only the very high measurement of partial discharge instrument of sensitivity just can detect, as supersonic reflectoscope etc.
Supersonic reflectoscope is the sound wave that occurs in the partial discharge of transformer with detecting, and by sonac sound wave is transformed to electric signal, utilizes the passing time difference of electric signal and acoustical signal, can try to achieve the distance of sensing point to point of discharge.Existing sonac has metal shell; front end at metal shell is fixed with piezoelectric vibrator; there is diaphragm the front of piezoelectric vibrator, and piezoelectric vibrator joins by signal processing circuit and out splice going splice, sound wave is transformed to electric signal and is sent to analytical equipments such as single-chip microcomputer etc.Present used diaphragm has two kinds on pottery and metal, though ceramic membrane has played protective effect to piezoelectric vibrator, is subjected to the interference of external electromagnetic signal easily; Though coat of metal has good anti-electromagnetic interference performance, be connected with the metal partially conductive of detected test product easily, the interference of ground circuit or test specimen itself will influence the detection performance of sensor.
Summary of the invention:
The present invention is in order to solve the above-mentioned technical matters of existing in prior technology, a kind of non-sonac that is used to detect the partial discharge of transformer signal that the face signal imports into, anti-electromagnetic interference performance is strong, degree of accuracy is high of accepting of avoiding to be provided.
Technical solution of the present invention is: a kind of sonac that is used to detect the partial discharge of transformer signal, metal shell is arranged, front end at metal shell is fixed with piezoelectric vibrator, there is diaphragm the front of piezoelectric vibrator, piezoelectric vibrator joins by signal processing circuit and out splice going splice, described piezoelectric vibrator is the radial polarization piezoelectric vibrator, and its axial two ends are coated with metal electrode; Described diaphragm is ceramic diaphragm, and the inside surface of diaphragm and side all are coated with metal level, and the metal electrode of the metal level of inside surface and piezoelectric vibrator front joins, and the metal level and the metal shell of side join.
Inwall at described metal shell is bonded with sound-absorbing material layer.
Be provided with the decoupling air gap between the inwall of described metal shell and the sound-absorbing material layer.
The used piezoelectric vibrator of the present invention adopts radial polarization; be used to accept the ultrasonic longitudinal wave signal; the side electrodeposited coating and the metal shell conduction of ceramic diaphragm have been connected to form a conductive shield body, can have made the insulation of piezoelectric vibrator and tested transformer metal object also can prevent outside electromagnetic interference.Simultaneously, bonding sound-absorbing material layer on the metal shell inwall can avoid the non-signal of accepting face to import into, makes sensor have good directivity, can effectively improve the accuracy that detects the partial discharge of transformer signal.
Description of drawings:
Fig. 1 is the structural representation of the embodiment of the invention.
Embodiment:
Below in conjunction with description of drawings the specific embodiment of the present invention.As shown in Figure 1: the same with prior art, metal shell 1 is arranged, front end at metal shell 1 is fixed with piezoelectric vibrator 2, there is diaphragm 3 front of piezoelectric vibrator 2, piezoelectric vibrator 2 joins by signal processing circuit 4 and out splice going splice 5 (BNC connector), and different is that piezoelectric vibrator 2 is the radial polarization piezoelectric vibrator with prior art, and it is metal electrode 6 that its axial two ends are coated with nickel dam, be used to accept the ultrasonic longitudinal wave signal, shear wave or side incoming wave are had rejection; Described diaphragm 3 is the high density ceramic material; can make piezoelectric vibrator 2 and tested metal object insulation; the inside surface of diaphragm 3 and side all are coated with metal level 7 (as nickel dam); the metal level 7 of inside surface and the metal electrode of piezoelectric vibrator 2 fronts 6 join by conducting resinl; the metal level 7 and the metal shell 1 of side join; make metal level 8 and metal shell 1 form a conductive shield body, prevented importing into of outside electromagnetic interference.The inwall that is preferably in described metal shell 1 is bonded with sound-absorbing material layer 8, is provided with decoupling air gap 9 between 8 layers of the inwall of described metal shell 1 and acoustic absorbants, can avoid the non-signal of accepting face to import into, makes sensor have good directivity.
Claims (3)
1. sonac that is used to detect the partial discharge of transformer signal, metal shell (1) is arranged, front end at metal shell (1) is fixed with piezoelectric vibrator (2), there is diaphragm (3) front of piezoelectric vibrator (2), piezoelectric vibrator (2) joins by signal processing circuit (4) and out splice going splice (5), it is characterized in that: described piezoelectric vibrator (2) is the radial polarization piezoelectric vibrator, and its axial two ends are coated with metal electrode (6); Described diaphragm (3) is ceramic diaphragm, and the inside surface of diaphragm (3) and side all are coated with metal level (7), and the metal level of inside surface (7) joins with the metal electrode (6) of piezoelectric vibrator (2) front, and the metal level of side (7) joins with metal shell (1).
2. the sonac that is used to detect the partial discharge of transformer signal according to claim 1 is characterized in that: the inwall at described metal shell (1) is bonded with sound-absorbing material layer (8).
3. the sonac that is used to detect the partial discharge of transformer signal according to claim 2 is characterized in that: be provided with decoupling air gap (9) between the inwall of described metal shell (1) and acoustic absorbant (8) layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102394654A CN101949996A (en) | 2010-07-29 | 2010-07-29 | Ultrasonic sensor used for detecting transformer partial discharge signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102394654A CN101949996A (en) | 2010-07-29 | 2010-07-29 | Ultrasonic sensor used for detecting transformer partial discharge signal |
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| Publication Number | Publication Date |
|---|---|
| CN101949996A true CN101949996A (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102394654A Pending CN101949996A (en) | 2010-07-29 | 2010-07-29 | Ultrasonic sensor used for detecting transformer partial discharge signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445619A (en) * | 2011-11-17 | 2012-05-09 | 北京交通大学 | Power transformer on-line state monitoring system based on audio information |
| CN112130033A (en) * | 2020-08-25 | 2020-12-25 | 广西电网有限责任公司南宁供电局 | Cable partial discharge noise signal detection device |
| CN115494359A (en) * | 2022-09-30 | 2022-12-20 | 上海格鲁布科技有限公司 | Partial discharge detection equipment for insulating and heat-insulating circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201397373Y (en) * | 2009-05-15 | 2010-02-03 | 河北省电力研究院 | Ultrasonic plane array sensor for partial discharge detection of transformer |
| CN101656490A (en) * | 2009-09-08 | 2010-02-24 | 华南农业大学 | Longitudinal bending compound modal linear ultrasonic motor |
| CN201464605U (en) * | 2009-08-13 | 2010-05-12 | 保定天威集团有限公司 | High-sensitivity local-discharge location ultrasonic sensor |
| EP2187226A2 (en) * | 2008-11-14 | 2010-05-19 | Korea Electric Power Corporation | Ultra-high frequency partial discharge array sensor apparatus for high-voltage power apparatus |
| CN201796143U (en) * | 2010-07-29 | 2011-04-13 | 大连世有电力科技有限公司 | Ultrasonic sensor for detecting partial discharge signals of transformer |
-
2010
- 2010-07-29 CN CN2010102394654A patent/CN101949996A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2187226A2 (en) * | 2008-11-14 | 2010-05-19 | Korea Electric Power Corporation | Ultra-high frequency partial discharge array sensor apparatus for high-voltage power apparatus |
| CN201397373Y (en) * | 2009-05-15 | 2010-02-03 | 河北省电力研究院 | Ultrasonic plane array sensor for partial discharge detection of transformer |
| CN201464605U (en) * | 2009-08-13 | 2010-05-12 | 保定天威集团有限公司 | High-sensitivity local-discharge location ultrasonic sensor |
| CN101656490A (en) * | 2009-09-08 | 2010-02-24 | 华南农业大学 | Longitudinal bending compound modal linear ultrasonic motor |
| CN201796143U (en) * | 2010-07-29 | 2011-04-13 | 大连世有电力科技有限公司 | Ultrasonic sensor for detecting partial discharge signals of transformer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445619A (en) * | 2011-11-17 | 2012-05-09 | 北京交通大学 | Power transformer on-line state monitoring system based on audio information |
| CN112130033A (en) * | 2020-08-25 | 2020-12-25 | 广西电网有限责任公司南宁供电局 | Cable partial discharge noise signal detection device |
| CN112130033B (en) * | 2020-08-25 | 2023-08-01 | 广西电网有限责任公司南宁供电局 | Cable partial discharge noise signal detection device |
| CN115494359A (en) * | 2022-09-30 | 2022-12-20 | 上海格鲁布科技有限公司 | Partial discharge detection equipment for insulating and heat-insulating circuit breaker |
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Application publication date: 20110119 |