CN215575479U - Anti-electromagnetic interference ultrasonic sensor - Google Patents
Anti-electromagnetic interference ultrasonic sensor Download PDFInfo
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- CN215575479U CN215575479U CN202121863807.XU CN202121863807U CN215575479U CN 215575479 U CN215575479 U CN 215575479U CN 202121863807 U CN202121863807 U CN 202121863807U CN 215575479 U CN215575479 U CN 215575479U
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- piezoelectric crystal
- ultrasonic sensor
- signal interface
- ultrasonic
- electromagnetic interference
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- 239000013078 crystal Substances 0.000 claims abstract description 57
- 239000002184 metal Substances 0.000 claims abstract description 13
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 230000010287 polarization Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 12
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model discloses an anti-electromagnetic interference ultrasonic sensor which comprises a metal shell, wherein a signal interface is arranged at one end of the metal shell, a plurality of piezoelectric crystals are arranged on the inner wall of the other end of the metal shell, and a voltage dividing resistor is arranged between each piezoelectric crystal and the signal interface. The piezoelectric crystal comprises a first piezoelectric crystal and a second piezoelectric crystal, and the first piezoelectric crystal and the second piezoelectric crystal are both made of lead zirconate titanate materials. The anti-electromagnetic interference ultrasonic sensor can effectively shield testing errors caused by forward and reverse interference in a transformer substation field detection environment, avoids the influence of external electromagnetic signals on ultrasonic partial discharge detection, improves the electromagnetic compatibility of the ultrasonic sensor, improves the repeatability and sensitivity of ultrasonic partial discharge detection, truly reflects the running state of equipment, effectively distinguishes various ultrasonic signals, and achieves the purpose of correctly evaluating the state of electrical equipment.
Description
Technical Field
The utility model relates to the technical field of charged detection, in particular to an anti-electromagnetic interference ultrasonic sensor.
Background
The ultrasonic sensor is important hardware in an ultrasonic partial discharge detection system, performance parameters of the ultrasonic sensor have great influence on an ultrasonic partial discharge detection result, the ultrasonic sensor which is generally applied on site at present has a single internal structure and is easily influenced by external electromagnetic interference, and the phenomenon of amplitude fluctuation often occurs when detecting peak values, effective values and frequency correlation, so that the repeatability of the detection result is poor, and the health condition of equipment is difficult to accurately evaluate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an anti-electromagnetic interference ultrasonic sensor, which is used for reducing the influence of external electromagnetic interference on a test process, improving the detection sensitivity and accurately reflecting the running state of electrical equipment.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an anti-electromagnetic interference ultrasonic sensor, includes metal casing, metal casing's one end is equipped with signal interface, metal casing's other end inner wall is equipped with a plurality of piezoelectric crystal, and is equipped with divider resistance between piezoelectric crystal and signal interface.
Preferably, the piezoelectric crystal comprises a first piezoelectric crystal and a second piezoelectric crystal, and the first piezoelectric crystal and the second piezoelectric crystal are both lead zirconate titanate materials.
Preferably, the polarization directions of the first piezoelectric crystal and the second piezoelectric crystal are opposite, the first piezoelectric crystal is electrically connected to the signal interface through a first voltage dividing resistor, and the second piezoelectric crystal is electrically connected to the signal interface through a second voltage dividing resistor.
Compared with the prior art, the utility model has the beneficial effects that:
the anti-electromagnetic interference ultrasonic sensor can effectively shield testing errors caused by forward and reverse interference in a transformer substation field detection environment, avoids the influence of external electromagnetic signals on ultrasonic partial discharge detection, improves the electromagnetic compatibility of the ultrasonic sensor, improves the repeatability and sensitivity of ultrasonic partial discharge detection, truly reflects the running state of equipment, effectively distinguishes various ultrasonic signals, and achieves the purpose of correctly evaluating the state of electrical equipment.
Drawings
Fig. 1 is a circuit diagram of an anti-electromagnetic interference ultrasonic sensor according to the present invention.
1. A metal housing; 2. a signal interface; 3. a first voltage dividing resistor; 4. a second voltage dividing resistor; 5. a first piezoelectric crystal; 6. a second piezoelectric crystal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the utility model provides an anti-electromagnetic interference ultrasonic sensor, includes metal casing 1, the one end of metal casing 1 is equipped with signal interface 2, the other end inner wall of metal casing 1 is equipped with a plurality of piezoelectric crystal, and is equipped with divider resistance between piezoelectric crystal and signal interface 2.
The piezoelectric crystal comprises a first piezoelectric crystal 5 and a second piezoelectric crystal 6, and the first piezoelectric crystal 5 and the second piezoelectric crystal 6 are both made of lead zirconate titanate materials.
The polarization directions of the first piezoelectric crystal 5 and the second piezoelectric crystal 6 are opposite, the first piezoelectric crystal 5 is electrically connected with the signal interface 2 through a first divider resistor 3, and the second piezoelectric crystal 6 is electrically connected with the signal interface 2 through a second divider resistor 4.
When the electric equipment has the hidden danger of ultrasonic partial discharge, the piezoelectric crystal converts the sound signal of the vibration of the electric equipment into an electric signal, and the first piezoelectric crystal 5 and the second piezoelectric crystal 6 obtain electric potentials with equal numerical values but opposite phases. Under the condition of no interference, because the resistance values of the first divider resistor 5 and the second divider resistor 6 are equal, the two divider resistors play a role of voltage sharing, and an electric signal received by the signal interface is one half of the potential difference value of the first piezoelectric crystal 5 and the second piezoelectric crystal 6. When the external environment has forward interference, the collected electric signals of the first piezoelectric crystal 5 and the second piezoelectric crystal 6 obtain a forward increment at the same time, and compared with the state without the interference, the potential difference value of the first piezoelectric crystal 5 and the second piezoelectric crystal 6 is unchanged, and the signal received by the signal interface is kept unchanged. Similarly, when there is reverse interference outside, the acquired electrical signals of the first piezoelectric crystal 5 and the second piezoelectric crystal 6 obtain negative increments at the same time, and compared with the state without interference, the potential difference between the first piezoelectric crystal 5 and the second piezoelectric crystal 6 is unchanged, and the signal received by the signal interface is still unchanged. The problem of signal fluctuation caused by external electromagnetic interference of the single-piezoelectric crystal ultrasonic sensor is avoided, meanwhile, the single-piezoelectric crystal ultrasonic sensor receives signals of electrical equipment and the outside simultaneously, field detection personnel cannot correctly distinguish abnormal conditions of the equipment, the state of the equipment cannot be truly and effectively reacted, the power failure maintenance opportunity is delayed, and equipment failure tripping is finally caused.
The working principle is as follows: through the ultrasonic sensor structure of many signal acquisition routes, gather ultrasonic wave original signal simultaneously, reduce the influence that external electromagnetic interference caused the test procedure to GIS equipment, further optimize ultrasonic sensor's central frequency.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. An anti-electromagnetic interference ultrasonic sensor, characterized in that: the device is characterized by comprising a metal shell (1), wherein a signal interface (2) is arranged at one end of the metal shell (1), a plurality of piezoelectric crystals are arranged on the inner wall of the other end of the metal shell (1), and a voltage dividing resistor is arranged between each piezoelectric crystal and the signal interface (2).
2. The ultrasonic sensor of claim 1, wherein: the piezoelectric crystal comprises a first piezoelectric crystal (5) and a second piezoelectric crystal (6), and the first piezoelectric crystal (5) and the second piezoelectric crystal (6) are both made of lead zirconate titanate materials.
3. The ultrasonic sensor of claim 2, wherein: the polarization directions of the first piezoelectric crystal (5) and the second piezoelectric crystal (6) are opposite, the first piezoelectric crystal (5) is electrically connected with the signal interface (2) through a first voltage dividing resistor (3), and the second piezoelectric crystal (6) is electrically connected with the signal interface (2) through a second voltage dividing resistor (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121863807.XU CN215575479U (en) | 2021-08-11 | 2021-08-11 | Anti-electromagnetic interference ultrasonic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121863807.XU CN215575479U (en) | 2021-08-11 | 2021-08-11 | Anti-electromagnetic interference ultrasonic sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215575479U true CN215575479U (en) | 2022-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121863807.XU Active CN215575479U (en) | 2021-08-11 | 2021-08-11 | Anti-electromagnetic interference ultrasonic sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215575479U (en) |
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2021
- 2021-08-11 CN CN202121863807.XU patent/CN215575479U/en active Active
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