CN114325269B - Ultrasonic partial discharge sensor structure for superconducting cable - Google Patents
Ultrasonic partial discharge sensor structure for superconducting cable Download PDFInfo
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- CN114325269B CN114325269B CN202111652837.0A CN202111652837A CN114325269B CN 114325269 B CN114325269 B CN 114325269B CN 202111652837 A CN202111652837 A CN 202111652837A CN 114325269 B CN114325269 B CN 114325269B
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- partial discharge
- superconducting cable
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- discharge sensor
- piezoelectric ceramic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The invention discloses an ultrasonic partial discharge sensor structure for a superconducting cable, which comprises a shell, wherein the shell comprises: the shell comprises a shell body and a resonance body connected to the bottom of the shell body, wherein a heat insulation cavity is formed in the shell body; the mounting flange is fastened at the end part of the shell body, is enclosed at the end part of the shell body and forms a first assembly cavity in the shell body; a second assembly chamber in communication with the first assembly chamber; the cover plate is fastened on one side of the mounting flange plate; and a plurality of retractable probes penetrating the cover plate and extending into the first assembly cavity, respectively; a piezoelectric ceramic piece installed in the first assembly chamber; and a signal conductor installed in the second assembly chamber. By implementing the ultrasonic partial discharge sensor structure for the superconducting cable, the partial discharge phenomenon of the superconducting cable can be effectively detected; the structure is simple, and the maintenance are easy.
Description
Technical Field
The invention relates to the technical field of superconducting equipment, in particular to an ultrasonic partial discharge sensor structure for a superconducting cable.
Background
A superconductor is a conductor having zero resistance characteristics at critical temperatures, which reduces resistive losses during power transmission. When the superconducting cable works, partial discharge can occur due to the problems of liquid nitrogen gasification, delamination of the superconducting connector and the like, and if the partial discharge exists for a long time, the internal fault of the superconducting cable can be caused, so that the partial discharge in the superconducting cable needs to be detected.
The prior art lacks a built-in partial discharge sensor capable of working in a liquid nitrogen temperature zone, and can not effectively monitor a superconducting cable.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultrasonic partial discharge sensor structure for a superconducting cable, which can effectively detect the partial discharge phenomenon of the superconducting cable; the structure is simple, and the maintenance are easy.
In order to solve the technical problem, the invention provides an ultrasonic partial discharge sensor structure for a superconducting cable, which comprises a shell, wherein the shell comprises: the shell comprises a shell body and a resonance body connected to the bottom of the shell body, wherein a heat insulation cavity is formed in the shell body; the mounting flange is fastened at the end part of the shell body, is enclosed at the end part of the shell body and forms a first assembly cavity in the shell body; a second assembly chamber in communication with the first assembly chamber; the cover plate is fastened on one side of the mounting flange plate; a plurality of retractable probes penetrating the cover plate and extending into the first assembly cavity, respectively; a piezoelectric ceramic piece installed in the first assembly chamber; and a signal conductor mounted in the second assembly chamber, wherein: two ends of the signal conductor are respectively connected to one side of the resonator body and one side of the piezoelectric ceramic plate, and the other side of the piezoelectric ceramic plate is abutted against the end part of the telescopic probe extending into the first assembly cavity.
The shell is soaked in liquid nitrogen, partial discharge occurs in the middle joint box of the superconducting cable, the resonance body conducts resonance signals to the piezoelectric ceramic plate through the signal conductor, and the piezoelectric ceramic plate is mechanically deformed.
The piezoelectric ceramic plates form voltage difference output signals and are led out through the telescopic probes.
Wherein, still include: an oscilloscope connected to the retractable probe for reading the partial discharge signal.
Wherein, the vacuum is drawn in the heat insulation cavity for heat insulation.
Wherein, piezoceramics piece includes: the piezoelectric ceramic layer and silver plating layers which are respectively attached to two opposite sides of the piezoelectric ceramic layer and used for leading out voltage signals.
Wherein, the thickness of the silver plating layer is 0.05mm.
The cover plate is fastened on the mounting flange plate through fastening bolts.
Wherein, the shell is made of 304 stainless steel material, and the apron is made of polytetrafluoroethylene material.
Wherein, the intermediate joint box of the superconducting cable generates partial discharge and generates ultrasonic signals, and the ultrasonic signals cause resonance with the frequency of 43kHz of the resonance body.
The ultrasonic partial discharge sensor structure for the superconducting cable has the following beneficial effects: an ultrasonic partial discharge sensor structure for a superconducting cable, comprising a housing comprising: the shell comprises a shell body and a resonance body connected to the bottom of the shell body, wherein a heat insulation cavity is formed in the shell body; the mounting flange is fastened at the end part of the shell body, is enclosed at the end part of the shell body and forms a first assembly cavity in the shell body; a second assembly chamber in communication with the first assembly chamber; the cover plate is fastened on one side of the mounting flange plate; and a plurality of retractable probes penetrating the cover plate and extending into the first assembly cavity, respectively; a piezoelectric ceramic piece installed in the first assembly chamber; and a signal conductor mounted in the second assembly chamber, wherein: two ends of the signal conductor are respectively connected to one side of the resonant body and one side of the piezoelectric ceramic piece, and the other side of the piezoelectric ceramic piece is abutted against the end part of the telescopic probe extending into the first assembly cavity, so that the partial discharge phenomenon of the superconducting cable can be effectively detected; the structure is simple, and the maintenance are easy.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view showing an external structure of an ultrasonic partial discharge sensor structure for a superconducting cable according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a blasting structure of an ultrasonic partial discharge sensor structure for a superconducting cable according to an embodiment of the present invention.
Fig. 3 is a schematic diagram showing an internal cross-sectional structure of an ultrasonic partial discharge sensor structure for a superconducting cable according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a piezoelectric ceramic sheet of an ultrasonic partial discharge sensor structure for a superconducting cable according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-4, there is shown a first embodiment of the ultrasonic partial discharge sensor structure for a superconducting cable according to the present invention.
An ultrasonic partial discharge sensor structure for a superconducting cable in this embodiment for connecting an intermediate joint box of the superconducting cable, detecting partial discharge, includes: housing 1, housing 1 includes: a housing body 11 and a resonance body 12 connected to the bottom of the housing body 11, wherein a heat insulation cavity 111 is arranged in the housing body 11; the mounting flange plate 2 is fastened at the end part of the shell body 11, and the mounting flange plate 2 is enclosed at the end part of the shell body 11 and forms a first assembly cavity 3 in the shell body 11; a second fitting chamber 4 communicating with the first fitting chamber 3; a cover plate 5 fastened to one side of the mounting flange 2; and a plurality of retractable probes 6 penetrating the cover plate and extending into the first assembly chamber 3, respectively; a piezoelectric ceramic plate 7 installed in the first assembly chamber 3; and a signal conductor 8 installed in the second fitting chamber 4.
Wherein: the two ends of the signal conductor 8 are respectively connected to one side of the resonator 12 and one side of the piezoelectric ceramic plate 7, and the other side of the piezoelectric ceramic plate 7 is abutted against the end part of the retractable probe 6 extending into the first assembly cavity 3.
In particular, the housing 1 is made of 304 stainless steel material, and the cover plate 5 is made of polytetrafluoroethylene material. The shell 1 is soaked in liquid nitrogen, partial discharge occurs in the middle joint box of the superconducting cable, the resonance body 12 conducts resonance signals to the piezoelectric ceramic sheet 7 through the signal conductor 8, and the piezoelectric ceramic sheet 7 is mechanically deformed. The piezo-ceramic plate 7 forms a voltage difference output signal and is led out through the retractable probe 6.
In the present embodiment, the housing 1 includes: a housing body 11 and a resonance body 12 connected to the bottom of the housing body 11, wherein a heat insulation cavity 111 is arranged in the housing body 11; a mounting flange 2 fastened to the end of the housing body 11. Wherein the inside of the heat insulating cavity 111 is evacuated for heat insulation.
Further, the mounting flange 2 is enclosed at the end of the housing body 11 and forms a first assembly cavity 3 inside the housing body 11; a second fitting chamber 4 communicating with the first fitting chamber 3. The cover plate 5 is fastened to the mounting flange 2 by fastening bolts 9.
The plurality of retractable probes 6 respectively penetrate through the cover plate 5 and extend to the first assembly cavity 3, and the plurality of retractable probes 6 have the following functions: the partial discharge signal occurring in the superconducting cable joint box is converted into an electrical signal between the retractable probes 6, and the stronger the partial discharge signal is, the larger the corresponding electrical signal amplitude is.
Further, the piezoelectric ceramic sheet 7 includes: the piezoelectric ceramic layer 71 and silver plating layers 72 which are respectively attached to two opposite sides of the piezoelectric ceramic layer 71 and used for leading out voltage signals. Wherein the silver plating 72 has a thickness of 0.05mm. Thus leading out the signal.
Further, the intermediate joint box of the superconducting cable generates partial discharge, and generates an ultrasonic signal, which causes the resonance body 12 to resonate at a frequency of 43 kHz.
The ultrasonic partial discharge sensor structure for a superconducting cable in this embodiment further includes: the oscilloscope which is connected to the telescopic probe 6 and used for reading the partial discharge signal is connected to the probe, so that the reading of the partial discharge signal can be realized.
In the structure of the ultrasonic partial discharge sensor for the superconducting cable in this embodiment, when the ultrasonic partial discharge sensor is specifically implemented, the ultrasonic partial discharge sensor is integrally mounted on the intermediate joint box of the superconducting cable, the part below the mounting flange 2 is immersed in liquid nitrogen, when partial discharge occurs in the superconducting cable joint box, an ultrasonic signal is generated, the ultrasonic signal causes resonance with the frequency of 43kHz of the resonant body 12, the vibration signal is transmitted to the piezoelectric ceramic plate 7 through the signal conductor 8, and the piezoelectric ceramic plate 7 vibrates, so that mechanical deformation occurs. The piezoelectric ceramic plate 7 generates a voltage difference to form an output signal, and the electrical signal is led out through the telescopic probes 6 which are conducted with the two sides of the piezoelectric ceramic plate 7.
Through the process, partial discharge signals generated in the superconducting cable joint box are converted into electric signals between the telescopic probes 6, the stronger the partial discharge signals are, the larger the corresponding electric signal amplitude is, and the oscilloscopes are connected to the probes, so that the reading of the partial discharge signals can be realized.
The ultrasonic partial discharge sensor structure for the superconducting cable has the following beneficial effects:
first, an ultrasonic partial discharge sensor structure for a superconducting cable includes a housing including: the shell comprises a shell body and a resonance body connected to the bottom of the shell body, wherein a heat insulation cavity is formed in the shell body; the mounting flange is fastened at the end part of the shell body, is enclosed at the end part of the shell body and forms a first assembly cavity in the shell body; a second assembly chamber in communication with the first assembly chamber; the cover plate is fastened on one side of the mounting flange plate; and a plurality of retractable probes penetrating the cover plate and extending into the first assembly cavity, respectively; a piezoelectric ceramic piece installed in the first assembly chamber; and a signal conductor installed in the second assembly chamber. The two ends of the signal conductor are respectively connected to one side of the resonant body and one side of the piezoelectric ceramic plate, and the other side of the piezoelectric ceramic plate is abutted against the end part of the telescopic probe extending into the first assembly cavity, so that the partial discharge phenomenon of the superconducting cable can be effectively detected.
Secondly, the structure is simple, and the maintenance, the maintenance and the control cost are easy.
Claims (10)
1. An ultrasonic partial discharge sensor structure for a superconducting cable, an intermediate joint box for connecting the superconducting cable, detecting partial discharge, characterized by comprising:
a housing, the housing comprising: the shell comprises a shell body and a resonance body connected to the bottom of the shell body, wherein a heat insulation cavity is formed in the shell body;
the mounting flange is fastened at the end part of the shell body, and the mounting flange is enclosed at the end part of the shell body and forms a first assembly cavity in the shell body;
a second assembly chamber in communication with the first assembly chamber;
the cover plate is fastened on one side of the mounting flange plate;
a plurality of retractable probes respectively penetrating through the cover plate and extending into the first assembly cavity;
a piezoelectric ceramic piece arranged in the first assembly cavity; and
a signal conductor disposed in the second assembly chamber, wherein: the two ends of the signal conductor are respectively connected to one side of the resonant body and one side of the piezoelectric ceramic plate, and the other side of the piezoelectric ceramic plate is abutted to the end part of the telescopic probe extending into the first assembly cavity.
2. The ultrasonic partial discharge sensor structure for a superconducting cable according to claim 1, wherein the housing is immersed in liquid nitrogen, partial discharge occurs in an intermediate joint box of the superconducting cable, the resonator body conducts a resonance signal to the piezoelectric ceramic plate through the signal conductor, and the piezoelectric ceramic plate is mechanically deformed.
3. An ultrasonic partial discharge sensor structure for a superconducting cable according to claim 2, characterized in that the piezoelectric ceramic plates form a voltage difference output signal and are led out through the retractable probe.
4. An ultrasonic partial discharge sensor structure for a superconducting cable according to claim 3, further comprising: and the oscilloscope is connected to the telescopic probe and used for reading the partial discharge signal.
5. An ultrasonic partial discharge sensor structure for a superconducting cable according to claim 1, wherein the inside of the heat insulating cavity is evacuated for heat insulation.
6. The ultrasonic partial discharge sensor structure for a superconducting cable according to claim 1, characterized in that the piezoelectric ceramic sheet includes: the piezoelectric ceramic layer and silver plating layers which are respectively attached to two opposite sides of the piezoelectric ceramic layer and used for leading out voltage signals.
7. An ultrasonic partial discharge sensor structure for a superconducting cable according to claim 6, characterized in that the silver plating layer has a thickness of 0.05mm.
8. An ultrasonic partial discharge sensor structure for a superconducting cable according to claim 1, characterized in that the cover plate is fastened to the mounting flange by fastening bolts.
9. The ultrasonic partial discharge sensor structure for a superconducting cable according to claim 8, characterized in that the housing is made of 304 stainless steel material, and the cover plate is made of polytetrafluoroethylene material.
10. An ultrasonic partial discharge sensor structure for a superconducting cable according to claim 2, wherein the intermediate joint box of the superconducting cable is partially discharged to generate an ultrasonic signal which causes resonance of the resonating body at a frequency of 43 kHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111652837.0A CN114325269B (en) | 2021-12-30 | 2021-12-30 | Ultrasonic partial discharge sensor structure for superconducting cable |
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| CN202111652837.0A CN114325269B (en) | 2021-12-30 | 2021-12-30 | Ultrasonic partial discharge sensor structure for superconducting cable |
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| CN114325269B true CN114325269B (en) | 2023-07-25 |
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| CN117269697B (en) * | 2023-10-26 | 2024-05-31 | 国网上海市电力公司 | Dewar-mounted long-distance superconducting cable partial discharge ultrasonic detection system and method thereof |
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| JP2016101016A (en) * | 2014-11-21 | 2016-05-30 | 住友電気工業株式会社 | Superconducting cable line |
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| CN110780170A (en) * | 2019-11-09 | 2020-02-11 | 深圳供电局有限公司 | Spherical shell type partial discharge sensing device |
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