CN201796143U - Ultrasonic sensor for detecting partial discharge signals of transformer - Google Patents
Ultrasonic sensor for detecting partial discharge signals of transformer Download PDFInfo
- Publication number
- CN201796143U CN201796143U CN201020274536XU CN201020274536U CN201796143U CN 201796143 U CN201796143 U CN 201796143U CN 201020274536X U CN201020274536X U CN 201020274536XU CN 201020274536 U CN201020274536 U CN 201020274536U CN 201796143 U CN201796143 U CN 201796143U
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- piezoelectric vibrator
- metal
- metal shell
- partial discharge
- transformer
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Abstract
The utility model discloses an ultrasonic sensor for detecting partial discharge signals of a transformer, which can prevent signals on a non-accepting surface from being transmitted in, and is strong in electromagnetic interference resistance and high in accuracy. The ultrasonic sensor is provided with a metal shell (1); a piezoelectric vibrator (2) is fixed at the front end of the metal shell (1); a protecting film (3) is arranged at the front of the piezoelectric vibrator (2); and the piezoelectric vibrator (2) is connected with an output joint (5) by 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 of the piezoelectric vibrator (2) are plated with metal layers (7); the metal layer (7) at the inner surface is connected with a metal electrode (6) at the front of the piezoelectric vibrator (2); and the metal layer (7) at the side surface is connected with the metal shell (1).
Description
Technical field:
The utility model 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 to get rid of, but very faint to have only the very high measurement of partial discharge instrument of sensitivity just can detect, as supersonic reflectoscope etc. because of partial discharge quantity.
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 utility model 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 utility model 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 utility model 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 utility model embodiment.
Embodiment:
Below in conjunction with description of drawings embodiment of the present utility model.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 |
|---|---|---|---|
| CN201020274536XU CN201796143U (en) | 2010-07-29 | 2010-07-29 | Ultrasonic sensor for detecting partial discharge signals of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020274536XU CN201796143U (en) | 2010-07-29 | 2010-07-29 | Ultrasonic sensor for detecting partial discharge signals of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201796143U true CN201796143U (en) | 2011-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020274536XU Expired - Lifetime CN201796143U (en) | 2010-07-29 | 2010-07-29 | Ultrasonic sensor for detecting partial discharge signals of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201796143U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949996A (en) * | 2010-07-29 | 2011-01-19 | 大连世有电力科技有限公司 | Ultrasonic sensor used for detecting transformer partial discharge signal |
-
2010
- 2010-07-29 CN CN201020274536XU patent/CN201796143U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949996A (en) * | 2010-07-29 | 2011-01-19 | 大连世有电力科技有限公司 | Ultrasonic sensor used for detecting transformer partial discharge signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |