CN112763862B - GIS built-in ultrasonic partial discharge sensor - Google Patents
GIS built-in ultrasonic partial discharge sensor Download PDFInfo
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- CN112763862B CN112763862B CN202011537114.1A CN202011537114A CN112763862B CN 112763862 B CN112763862 B CN 112763862B CN 202011537114 A CN202011537114 A CN 202011537114A CN 112763862 B CN112763862 B CN 112763862B
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- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a GIS built-in ultrasonic partial discharge sensor, which comprises: the rear cover is connected with a power signal wire, and the middle flange is assembled with the rear cover, and a small signal amplifying circuit board is arranged on one side of the middle flange, which faces the rear cover; the middle flange is provided with a mounting tube in the center, an insulating sleeve is inserted into the mounting tube, one end of a conductive column penetrates through the insulating sleeve and is connected with the input end of the small signal amplifying circuit board, and the other end of the conductive column is abutted against the back surface of the ultrasonic transduction piece; the ultrasonic transduction piece is fixed on the end face of the mounting tube through a mounting clamping ring; the front of the ultrasonic transduction piece is fixedly provided with a resonance body, the ultrasonic transduction piece is used for converting mechanical deformation generated by vibration of the resonance body into a voltage signal, the small signal amplifying circuit board is provided with an amplifying transmission module for amplifying the voltage signal, and the voltage signal is transmitted to a background acquisition device through the power signal wire. The invention can effectively improve the signal-to-noise ratio of the sensor.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution, in particular to a GIS built-in ultrasonic partial discharge sensor.
Background
GIS is called metal enclosed combined switch, GIS is the important equipment of electric power system, usually includes outside metal casing, electrically conductive part, solid insulation, SF6 gas. Partial discharge is a common type of defect in electrical equipment, and occurs because of defects such as cracking, aging, dirt and the like of an insulator in the electrical equipment, and the insulator breaks down locally under the action of an electric field. The partial discharge part of the power equipment generates signals with characteristics such as ultrasonic waves, ultraviolet rays, ultrahigh frequency electromagnetic waves and the like. If there is a partial discharge phenomenon in the GIS device, insulation breakdown may occur in the GIS device, and a long time is required between the partial discharge and the insulation breakdown. Therefore, the partial discharge signal inside the GIS equipment is found early, and insulation damage of the GIS caused by the existence of the partial discharge for a long time is reduced. According to the self characteristics of partial discharge, ultrasonic waves, ultraviolet rays and ultrahigh frequency electromagnetic waves are detected, so that early partial discharge inside GIS equipment can be effectively found. The existing ultrasonic partial discharge sensor is installed outside a GIS equipment shell, ultrasonic signals are shielded by a GIS metal shell, and the signal to noise ratio of the ultrasonic sensor installed outside the GIS shell is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a GIS built-in ultrasonic partial discharge sensor so as to improve the signal-to-noise ratio of the sensor.
In order to solve the technical problems, the present invention provides a GIS built-in ultrasonic partial discharge sensor, comprising:
the rear cover is connected with a power signal wire, and the middle flange is assembled with the rear cover, and a small signal amplifying circuit board is arranged on one side of the middle flange, which faces the rear cover;
the middle flange is provided with a mounting tube in the center, an insulating sleeve is inserted into the mounting tube, one end of a conductive column penetrates through the insulating sleeve and is connected with the input end of the small signal amplifying circuit board, and the other end of the conductive column is abutted against the back surface of the ultrasonic transduction piece; the ultrasonic transduction piece is fixed on the end face of the mounting tube through a mounting clamping ring;
the front of the ultrasonic transduction piece is fixedly provided with a resonance body, the resonance body is used for vibrating when receiving ultrasonic signals transmitted from the inside of the GIS equipment, the ultrasonic transduction piece is used for converting mechanical deformation generated by vibration of the resonance body into voltage signals, and the small signal amplifying circuit board is provided with an amplifying transmission module for amplifying the voltage signals and transmitting the voltage signals to the background acquisition equipment through the power signal wire.
Further, the GIS built-in ultrasonic partial discharge sensor further comprises a front cover assembled with the middle flange, a liquid filling cavity for containing coupling liquid is arranged in the front cover, and the liquid filling cavity is communicated with the middle flange.
Further, an outer liquid filling hole is formed in the side face of the middle flange, an inner liquid filling hole communicated with the outer liquid filling hole is formed beside the mounting pipe, coupling liquid is injected through the outer liquid filling hole, and the coupling liquid flows out of the inner liquid filling hole to fill the liquid filling cavity in the front cover.
Further, a clamping ring groove is formed in the top of the installation tube, the installation clamping ring is fixed to the clamping ring groove, and the ultrasonic transduction piece is propped against the end face of the installation tube through the installation clamping ring.
Further, the installation snap ring comprises a snap ring body which is in an unclosed annular shape and compression reeds which are symmetrically arranged on the snap ring body, the snap ring body is sleeved on the snap ring groove, and the compression reeds compress the ultrasonic transduction piece on the end face of the installation tube.
Further, the conductive column comprises a conductive column, a hemispheroid arranged at the top of the conductive column and a groove arranged at the top of the hemispheroid, and the hemispheroid is in contact with the back surface of the ultrasonic transduction piece through a disc-shaped reed arranged in the groove so as to lead out the electric signal of the ultrasonic transduction piece.
Further, the dish-shaped reed comprises a reed body, and a protrusion and a depression respectively positioned at two sides of the reed body, and the dish-shaped reed is used for connecting the ultrasonic transduction piece and the conductive column.
Further, the insulating sleeve comprises a large cylinder and a small cylinder which are coaxial, a central hole is formed in the axis in a penetrating mode, the small cylinder and the large cylinder of the insulating sleeve are sequentially inserted into the mounting tube of the middle flange, and the central hole is used for accommodating the conductive cylinder of the conductive column.
Further, an insulating coating is arranged on the edge of the ultrasonic transduction piece, and an insulating ring is arranged on the back surface of the ultrasonic transduction piece and used for isolating the ultrasonic transduction piece from the middle flange.
Further, the resonator body is bonded to the front surface of the ultrasonic transducer by an epoxy resin adhesive, and includes a resonant disk and a connection post for conducting mechanical vibration of the resonant disk to the ultrasonic transducer.
Further, the rear cover is provided with a first mounting plate for being assembled with the middle flange, and a mounting cavity for accommodating a lithium battery is arranged in the center of the first mounting plate.
Further, a plurality of mounting seats are arranged on one side, facing the rear cover, of the middle flange in a protruding mode, and are used for mounting the small-signal amplifying circuit board.
The embodiment of the invention has the beneficial effects that: according to the requirements of GIS equipment on the tightness and mechanical strength of the built-in sensor, the GIS equipment is manufactured by adopting the same materials as the GIS inner conductor and the insulator, so that the normal operation of the GIS equipment is not affected; the elastic element is adopted to fix the ultrasonic transduction piece, so that the ultrasonic transduction piece has higher sensitivity; according to the characteristics of the ultrasonic signal frequency band of partial discharge in the GIS, a large-size resonance sheet is adopted, so that the sensitivity is further improved; the independent liquid filling cavity is adopted to isolate the ultrasonic element from the interior of the GIS, and the normal operation of GIS equipment is not affected when the ultrasonic sensor element falls off; the liquid filling cavity is filled with coupling liquid, so that the normal ultrasonic signal receiving is not influenced while the isolation effect is ensured; and the signal to noise ratio of the sensor is effectively improved.
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 diagram of a three-dimensional exploded structure of a GIS built-in ultrasonic partial discharge sensor according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of another three-dimensional exploded structure of a GIS built-in ultrasonic partial discharge sensor according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a rear cover according to an embodiment of the present invention.
Fig. 4 is a schematic perspective view of an intermediate flange according to an embodiment of the present invention.
Fig. 5 is a schematic perspective view of a snap ring according to an embodiment of the present invention.
Fig. 6 is a schematic perspective view of a conductive pillar according to an embodiment of the present invention.
Fig. 7 is a schematic perspective view of an insulation sleeve according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of an ultrasonic transducer according to an embodiment of the present invention.
Fig. 9 is a schematic perspective view of a resonator body according to an embodiment of the invention.
Fig. 10 is a schematic perspective view of a front cover according to an embodiment of the present invention.
Fig. 11 is a schematic perspective view of a GIS built-in ultrasonic partial discharge sensor according to an embodiment of the present invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. The terms of direction and position in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the invention and are not intended to limit the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a GIS built-in ultrasonic partial discharge sensor, including:
a rear cover 2 connected with a power signal wire 5, and an intermediate flange 3 assembled with the rear cover 2, wherein the intermediate flange 3 is provided with a small signal amplifying circuit board 4 at one side facing the rear cover 2;
the middle flange 3 is provided with a mounting tube 30 at the center, an insulating sleeve 6 is inserted into the mounting tube, one end of a conductive post 7 penetrates through the insulating sleeve 6 and is connected with the input end of the small signal amplifying circuit board 4, and the other end of the conductive post is abutted against the back surface of the ultrasonic transduction piece 8; the ultrasonic transduction piece 8 is fixed on the end face of the installation tube 30 through the installation clamping ring 35;
the front of the ultrasonic transduction piece 8 is fixed with a resonance body 9 for receiving ultrasonic signals, the resonance body 9 is used for vibrating when receiving the ultrasonic signals transmitted from the inside of the GIS equipment, the ultrasonic transduction piece 8 is used for converting mechanical deformation generated by the vibration of the resonance body 9 into voltage signals, and the small signal amplifying circuit board 4 is provided with an amplifying transmission module for amplifying the voltage signals and transmitting the voltage signals to the background acquisition equipment through the power signal wire 5.
Further, referring to fig. 2 again, the GIS built-in ultrasonic partial discharge sensor of the present embodiment is further provided with a front cover 1 assembled with an intermediate flange 3, a liquid filling cavity 10 for accommodating coupling liquid is provided in the front cover 1, and the liquid filling cavity 10 is communicated with the intermediate flange 3. The resonant body 9 is soaked in the coupling liquid in the liquid filling cavity 10, and ultrasonic waves are conducted to the resonant body 9 through the coupling liquid, so that the working efficiency of the ultrasonic transduction piece 8 can be increased, and the GIS liquid filling type ultrasonic partial discharge sensor is formed.
Referring to fig. 3, the rear cover 2 has a first mounting plate 20 for assembly with the intermediate flange 3, a mounting cavity 21 for receiving a lithium battery is provided in the center of the first mounting plate 20, and a plurality of first mounting holes 22 are provided in the first mounting plate 20. The rear cover 2 is made of 6061 aluminum alloy by die casting, and as an example, the center distance of the first mounting holes 22 is 62.5mm, the inner diameter is 12.5mm, and the first mounting holes are used for passing through M12 bolts; the power signal line 5 is a 4-core twisted pair and is respectively a direct current +12V, a power ground, a signal A and a signal B, the transmitted signals are analog voltage signals of 0.1V-10V, wherein the direct current +12V and the power ground are connected with the power end of the small signal amplifying circuit board 4, and the signal A and the signal B are connected with the output end of the small signal amplifying circuit board 4.
Referring to fig. 4, the middle flange 3 is adapted to the first mounting plate 20 of the rear cover 2, and is generally cylindrical in shape, and has an outer liquid filling hole 31 on a side surface thereof, an inner liquid filling hole 32 communicating with the outer liquid filling hole 31 is provided beside the mounting tube 30, and coupling liquid is injected through the outer liquid filling hole 31 and flows out from the inner liquid filling hole 32 to fill the liquid filling cavity 10 in the front cover 1. The top of the mounting tube 30 is provided with a snap ring groove 34. The intermediate flange 3 is provided with a plurality of second mounting holes 33 for passing through the M12 bolts at positions corresponding to the first mounting holes 22 on the rear cover 2. A mounting snap ring 35 (see fig. 1) is fixed to the snap ring groove 34, and the ultrasonic transducer 8 is pressed against the end face of the mounting tube 30 by the elastic structure of the mounting snap ring 35. The intermediate flange 3 is made of 6063 aluminum alloy and is manufactured by adopting a milling process, and as an example, the intermediate flange 3 is a cylinder with the outer diameter of 150mm and the height of 30 mm; the center distance of the second mounting holes 33 is 62.5mm, and the inner diameter is 12.5mm for passing through the M12 bolts; the mounting tube 30 has an outer diameter of 35mm, an inner diameter of 20mm and a height of 35mm; the width of the snap ring groove is 2mm, and the outer diameter is 33mm; the inner diameter of the outer liquid filling hole is 4mm, and the inner liquid filling hole is 4mm. The middle flange 3 is provided with a plurality of mounting seats 36 protruding toward one side of the rear cover 2 for mounting the small signal amplifying circuit board 4, and as an example, 4 mounting seats 36 are all cylinders with an outer diameter of 12mm and a height of 10mm, and an M6 screw hole is formed in the center and a depth of 8mm for penetrating through an M6 bolt.
Referring to fig. 5, the mounting clip 35 includes an unsealed annular clip body 351, compression springs 352 symmetrically disposed on the clip body 351, and a third mounting hole 353 at the end of the clip body 351. The mounting snap ring 35 is made of H65 brass and is manufactured by adopting a milling process. The inner diameter of the mounting snap ring 35 is 33mm, the outer diameter is 37mm, the thickness is 1.8mm, and the thickness of the compression reed 352 is 0.8mm; the inner diameter of the third mounting hole 353 is 1.5mm. During assembly, the clamping spring pliers are inserted into the third mounting holes 353, the mounting clamping rings 35 are integrally opened and sleeved in the clamping ring grooves 34 of the middle flange 3, the clamping spring pliers are loosened, the mounting clamping rings 35 are elastically fixed in the clamping ring grooves 34 by themselves, and meanwhile, the pressing reed 352 presses the ultrasonic transduction piece 8 on the end face of the mounting pipe 30 of the middle flange 3, so that the ultrasonic transduction piece 8 is prevented from being displaced and falling off.
Referring to fig. 6, the conductive column 7 includes a conductive column 70, a hemispherical body 71 disposed on top of the conductive column 70, and a groove 72 disposed on top of the hemispherical body 71, a disc-shaped reed 73 (see fig. 1) is installed in the groove 72, and the hemispherical body 71 of the conductive column 7 contacts the back surface of the ultrasonic transducer 8 through the disc-shaped reed 73 to lead out the electrical signal of the ultrasonic transducer 8. As an example, the material of the conductive post 7 is 65 brass, and is manufactured by turning; the radius of the hemisphere 71 is 8mm, the diameter of the groove 72 is 6mm, the depth is 0.5mm, the diameter of the conductive cylinder 70 is 5mm, and the length is 45mm.
The disc-shaped reed 73 comprises a reed body, and bulges and depressions respectively positioned at two sides of the reed body, the disc-shaped reed is made of conductive plastic, and comprises 0.5% of carbon black, 95% of polyethylene and 4.5% of polypropylene, and is made by adopting a mould pressing process, wherein the silver plating is performed on the surface, the thickness of a silver plating layer is 0.02mm, the outer diameter is 6mm, the inner diameter is 3mm and the thickness is 2mm; the height of the protrusions is 0.8mm, and the depth of the depressions is 0.8mm. The disc-shaped reed 73 is used for connecting the ultrasonic transduction piece 8 and the conductive column 7, and ensures electric contact through self elastic deformation, and the elastic modulus of the disc-shaped reed 73 is far lower than that of a metal material, so that vibration interference caused by the conductive column 7 can be reduced.
Referring to fig. 7, the insulating sleeve 6 is a stepped cylinder, and includes a large cylinder 61 with a relatively large diameter and a small cylinder 62 with a relatively small diameter, wherein the large cylinder 61 and the small cylinder 62 are coaxial, and a central hole 63 is formed on the axis. The small and large cylinders 62, 61 of the insulating sleeve 6 are inserted in turn into the mounting tube 30 of the intermediate flange 3, wherein the large cylinder 61 is at least partially exposed outside the mounting tube 30 and the central hole 63 is intended to receive the conductive cylinder 70 of the conductive post 7. The insulating sleeve 6 is connected with the conductive column 7 and the intermediate flange 3 to form a complete sealing structure, and meanwhile, the insulating sleeve 6 also plays a role in insulation to isolate the conductive column 7 from the intermediate flange 3, and the insulating sleeve 6 can be made of polytetrafluoroethylene materials by turning in the embodiment. As an example, the diameter of the large cylinder 61 is 20mm, the height is 25mm, the diameter of the small cylinder 62 is 16mm, the height is 30mm, and the diameter of the center hole 63 is 5mm.
Referring to fig. 8, the ultrasonic transducer 8 is cylindrical, and an insulating coating 81 is disposed on the edge of the ultrasonic transducer, wherein the insulating coating 81 is usually an epoxy insulating paint for ensuring side insulation of the ultrasonic transducer 8. The back of the ultrasonic transduction piece 8 is provided with an insulating ring 82, the ultrasonic transduction piece 8 is isolated from the middle flange 3, the effects of electric insulation and vibration isolation are achieved, and the ultrasonic transduction piece 8 is ensured to work normally. As an example, the ultrasonic transducer 8 has a diameter of 35mm and a thickness of 2mm, is made of barium titanate, is made by sintering process, and has silver plating on the front and back surfaces, and has a silver plating thickness of 0.02mm. When the ultrasonic transduction piece 8 is mechanically deformed, the barium titanate crystals have bound charges with opposite signs at the two ends of the crystals due to piezoelectric effect, voltage is generated between the front surface and the back surface of the ultrasonic transduction piece 8, and the silver coating is used for leading out voltage signals generated by the ultrasonic transduction piece 8; the insulating ring 82 is specifically an ethylene propylene diene monomer ring having an outer diameter of 33mm, an inner diameter of 27mm, and a thickness of 0.2 mm.
Referring to fig. 9, the resonator body 9 is bonded to the front surface of the ultrasonic transducer 8 by epoxy resin glue, and includes a resonator plate 91 and a connection post 92, where the resonator body 9 is made by 6061 aluminum alloy turning, the resonator plate 91 has a diameter of 25mm and a thickness of 3mm, the connection post 92 has a diameter of 10mm and a thickness of 2mm, the resonant frequency of the resonator plate 91 is determined by the size of the resonator plate, the resonant frequency of the resonator plate 91 in this embodiment is 56.6kHz, the amplitude of mechanical resonance of the resonator plate 91 is maximum when an ultrasonic signal of 56.6kHz exists around the resonator plate 91, and the connection post 92 is used to conduct mechanical vibration of the resonator plate 91 to the ultrasonic transducer 8.
Referring to fig. 10, the front cover 1 includes a second mounting plate 11 with a shape adapted to the middle flange 3, the liquid filling cavity 10 protrudes outwards from the second mounting plate 11, and a third mounting hole 12 is provided on the second mounting plate 11 corresponding to the second mounting hole 33 on the middle flange 3 for passing through the M12 bolt. The M12 bolts pass through the third mounting holes 12, the second mounting holes 33 and the first mounting holes 22 to fix the front cover 1, the intermediate flange 3 and the rear cover 2. As an example, the second mounting plate 11 is made of 6063 aluminum alloy, and is made of a cylinder with an outer diameter of 150mm and a height of 30mm by adopting a milling process; the center distance of the mounting holes is 62.5mm; the liquid filling chamber 10 is a hollow hemisphere with an outer radius of 40mm, an inner radius of 38mm and a thickness of 2mm. The coupling liquid comprises dimethyl silicone oil.
Fig. 11 is a schematic perspective view of an assembled ultrasonic partial discharge sensor with a GIS built-in structure according to this embodiment. The working principle and the working process are as follows: when partial discharge occurs in the GIS equipment, an ultrasonic signal with a wider frequency band is generated at a fault part, the resonator 9 receives the ultrasonic signal transmitted from the inside of the GIS equipment and vibrates, the resonator 9 drives the ultrasonic transduction piece 8 to vibrate, the ultrasonic transduction piece 8 is mechanically deformed, the mechanical deformation is converted into a voltage signal with the amplitude of 0.1mV-10mV by the ultrasonic transduction piece 8 through a piezoelectric effect, the voltage signal is transmitted to the small signal amplification circuit board 4, the small signal amplification circuit board 4 is provided with a standard amplification module with the voltage amplification factor of 1000 times, the voltage signal with the amplitude of 0.1-10mV is amplified into a voltage signal with the amplitude of 0.1V-10V, the voltage signal is transmitted to the background acquisition equipment by the power signal wire 5, and when the amplitude of the voltage signal exceeds 5V, the partial discharge signal is considered to exist in the GIS equipment, the background acquisition equipment gives an alarm to monitoring staff, so that the monitoring of the partial discharge in the GIS equipment is realized. The liquid filling cavity 10 is communicated with the middle flange 3, coupling liquid is filled in through the outer liquid filling hole 31 and the inner liquid filling hole 32 of the middle flange 3, and ultrasonic waves are conducted to the resonator 9 through the coupling liquid, so that the working efficiency of the ultrasonic transduction piece 8 can be increased.
As can be seen from the above description, compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the requirements of GIS equipment on the tightness and mechanical strength of the built-in sensor, the GIS equipment is manufactured by adopting the same materials as the GIS inner conductor and the insulator, so that the normal operation of the GIS equipment is not affected; the elastic element is adopted to fix the ultrasonic transduction piece, so that the ultrasonic transduction piece has higher sensitivity; according to the characteristics of the ultrasonic signal frequency band of partial discharge in the GIS, a large-size resonance sheet is adopted, so that the sensitivity is further improved; the independent liquid filling cavity is adopted to isolate the ultrasonic element from the interior of the GIS, and the normal operation of GIS equipment is not affected when the ultrasonic sensor element falls off; the liquid filling cavity is filled with coupling liquid, so that the normal ultrasonic signal receiving is not influenced while the isolation effect is ensured; and the signal to noise ratio of the sensor is effectively improved.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. The utility model provides a sensor is put to built-in ultrasonic wave office of GIS which characterized in that includes:
the rear cover is connected with a power signal wire, and the middle flange is assembled with the rear cover, and a small signal amplifying circuit board is arranged on one side of the middle flange, which faces the rear cover;
the middle flange is provided with a mounting tube in the center, an insulating sleeve is inserted into the mounting tube, one end of a conductive column penetrates through the insulating sleeve and is connected with the input end of the small signal amplifying circuit board, and the other end of the conductive column is abutted against the back surface of the ultrasonic transduction piece; the ultrasonic transduction piece is fixed on the end face of the mounting tube through a mounting clamping ring;
the front surface of the ultrasonic transduction piece is fixedly provided with a resonance body, the resonance body is used for vibrating when receiving ultrasonic signals transmitted from the inside of GIS equipment, the ultrasonic transduction piece is used for converting mechanical deformation generated by the vibration of the resonance body into voltage signals, the small signal amplifying circuit board is provided with an amplifying transmission module for amplifying the voltage signals, and the voltage signals are transmitted to background acquisition equipment through the power signal wire;
the GIS built-in ultrasonic partial discharge sensor further comprises a front cover assembled with the middle flange, wherein a liquid filling cavity for containing coupling liquid is arranged in the front cover, and the liquid filling cavity is communicated with the middle flange; an outer liquid filling hole is formed in the side face of the middle flange, an inner liquid filling hole communicated with the outer liquid filling hole is formed beside the mounting pipe, coupling liquid is injected through the outer liquid filling hole, and the coupling liquid flows out of the inner liquid filling hole so as to fill a liquid filling cavity in the front cover;
the top of the mounting pipe is provided with a clamping ring groove, a mounting clamping ring is fixed on the clamping ring groove, and the ultrasonic transduction piece is propped against the end face of the mounting pipe through the mounting clamping ring; the mounting clamp ring comprises an unclosed annular clamp ring body and compression reeds symmetrically arranged on the clamp ring body, wherein the clamp ring body is sleeved on the clamp ring groove, and the compression reed compresses the ultrasonic transduction sheet on the end face of the mounting tube.
2. The GIS built-in ultrasonic partial discharge sensor according to claim 1, wherein the conductive column comprises a conductive column, a hemisphere disposed on the top of the conductive column, and a groove disposed on the top of the hemisphere, and the hemisphere contacts the back surface of the ultrasonic transduction sheet through a disk-shaped reed installed in the groove, so as to lead out an electrical signal of the ultrasonic transduction sheet.
3. The GIS built-in ultrasonic partial discharge sensor according to claim 2, wherein the disc-shaped reed comprises a reed body, and protrusions and depressions respectively located at both sides of the reed body, and the disc-shaped reed is used for connecting the ultrasonic transduction piece with the conductive column.
4. The GIS built-in ultrasonic partial discharge sensor according to claim 2, wherein the insulating sleeve comprises a coaxial large cylinder and a small cylinder, a central hole is formed through the axis, the small cylinder and the large cylinder of the insulating sleeve are sequentially inserted into the mounting tube of the intermediate flange, and the central hole is used for accommodating the conductive cylinder of the conductive column.
5. The GIS built-in ultrasonic partial discharge sensor according to claim 1, wherein an insulating coating is provided on an edge of the ultrasonic transduction piece, and an insulating ring is provided on a back surface of the ultrasonic transduction piece for isolating the ultrasonic transduction piece from the intermediate flange.
6. The GIS built-in ultrasonic partial discharge sensor according to claim 1, wherein the resonator body is bonded to the front surface of the ultrasonic transduction sheet by an epoxy resin adhesive, and includes a resonant disk and a connection post for conducting mechanical vibration of the resonant disk to the ultrasonic transduction sheet.
7. The GIS built-in ultrasonic partial discharge sensor according to claim 1, wherein the rear cover has a first mounting plate for assembly with the intermediate flange, and a mounting cavity for accommodating a lithium battery is provided at the center of the first mounting plate.
8. The GIS built-in ultrasonic partial discharge sensor according to claim 1, wherein a plurality of mounting seats are protruded from one side of the middle flange, which faces the rear cover, for mounting the small signal amplification circuit board.
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