CN113702818A - GIS equipment and partial discharge ultrahigh frequency monitoring assembly - Google Patents
GIS equipment and partial discharge ultrahigh frequency monitoring assembly Download PDFInfo
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- CN113702818A CN113702818A CN202110924962.6A CN202110924962A CN113702818A CN 113702818 A CN113702818 A CN 113702818A CN 202110924962 A CN202110924962 A CN 202110924962A CN 113702818 A CN113702818 A CN 113702818A
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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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
- G01R31/1254—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 of gas-insulated power appliances or vacuum gaps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0358—Connections to in or out conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a GIS device and a partial discharge ultrahigh frequency monitoring component, wherein a partial ultrahigh frequency discharge signal of the GIS device is obtained by induction through a butterfly antenna, so that the product volume can be reduced, the structure is simple, the assembly is convenient, and the gain height and the frequency bandwidth can be realized; in addition, the first flange plate is a metal plate, so that electromagnetic interference outside the GIS equipment can be reduced, the GIS equipment has the advantages of strong anti-interference capability and wide monitoring frequency band, partial discharge ultrahigh frequency signals of the antenna can be better monitored, and the monitoring performance is more stable; in addition, the insulating protective cover covers the outer portion of the butterfly antenna, the butterfly antenna is protected, the induced potential between the butterfly antenna and high-voltage equipment can be isolated through insulating materials, deformation of the butterfly antenna due to long-time extrusion of air pressure in the GISS equipment can be prevented, partial discharge ultrahigh-frequency signals of the antenna can be well monitored, and monitoring performance is stable.
Description
Technical Field
The invention relates to the technical field of GIS equipment, in particular to GIS equipment and a partial discharge ultrahigh frequency monitoring assembly.
Background
The requirements for the voltage born by the power transmission line and the energy transmitted by the power transmission line are higher and higher, the power system cannot be unchanged any more due to the increase of the two data, the power system needs to become more intelligent, and meanwhile, the stability of the power system needs to be more careful, so that the power system becomes more reliable. To make electric power system operation stable, the stability of GIS equipment plays decisive role, so research GIS equipment is indispensable.
Partial discharge on-line monitoring is taken as an important means of state maintenance and is widely applied to the field of high-voltage monitoring at present. The monitoring of the partial discharge ultrahigh frequency of the GIS equipment is mainly divided into a built-in ultrahigh frequency sensor and an external ultrahigh frequency sensor. For a built-in ultrahigh frequency sensor, the traditional antennas for built-in partial discharge ultrahigh frequency of GIS equipment comprise a butterfly antenna, a planar antenna, a circular antenna, an insulator embedded antenna and the like, and the planar antenna, the circular antenna and the insulator embedded antenna have the defects of difficulty in monitoring low-frequency signals, low sensitivity of high-frequency signals and insufficient monitoring of other frequency signals. Compared with the antennas of the above types, the butterfly antenna has excellent performances such as a wide frequency band and a high gain, and is widely used for monitoring partial discharge ultrahigh frequency signals of GIS equipment. However, the butterfly antenna is susceptible to the influence of external physical environment, and the defect of unstable monitoring performance is easily caused in the monitoring process of partial discharge ultrahigh frequency signals (the ultrahigh frequency signals are 300MHz-1.5GHz) in the GIS equipment.
Disclosure of Invention
Therefore, it is necessary to overcome the defects of the prior art, and provide a GIS device and a partial discharge ultrahigh frequency monitoring assembly, which can better monitor the partial discharge ultrahigh frequency signal of the antenna and have stable monitoring performance.
The technical scheme is as follows: a partial discharge uhf monitoring assembly, comprising: the first flange plate is a metal plate and is used for being correspondingly connected with a second flange plate of a medium window of the GIS equipment; the insulating protective cover is arranged on the first side face of the first flange plate and used for penetrating through the dielectric window to extend into the cavity of the GIS equipment; the butterfly antenna is arranged on the first side face and is positioned inside the insulating protective cover.
After the first flange plate is arranged on the second flange plate, the insulating protective cover penetrates through the dielectric window and extends into the cavity of the GIS equipment, and the local ultrahigh frequency discharge signal of the GIS equipment is obtained through induction of the butterfly antenna, so that the product volume can be reduced, the structure is simple, the assembly is convenient, and the gain height and the frequency bandwidth can be realized; in addition, the first flange plate is a metal plate, so that electromagnetic interference outside the GIS equipment can be reduced, the GIS equipment has the advantages of strong anti-interference capability and wide monitoring frequency band, partial discharge ultrahigh frequency signals of the antenna can be better monitored, and the monitoring performance is more stable; in addition, the insulating protective cover covers the outer portion of the butterfly antenna, the butterfly antenna is protected, the induced potential between the butterfly antenna and high-voltage equipment can be isolated through insulating materials, deformation of the butterfly antenna due to long-time extrusion of air pressure in the GISS equipment can be prevented, partial discharge ultrahigh-frequency signals of the antenna can be well monitored, and monitoring performance is stable.
In one embodiment, the partial discharge ultrahigh frequency monitoring assembly further comprises a balun structure and a transmission connector; the butterfly antenna comprises a dielectric substrate, a first radiating patch and a second radiating patch which are arranged on the dielectric substrate at intervals and symmetrically; the first radiation patch and the second radiation patch are both in a triangular shape; a first feeding point is arranged at the position, close to the vertex angle of the second radiation patch, of the first radiation patch, and a second feeding point is arranged at the position, close to the vertex angle of the first radiation patch, of the second radiation patch; the first feeding point and the second feeding point are electrically connected with the balun structure, a first through hole is formed in the first flange plate, the transmission joint is arranged on the second side face of the first flange plate, and the balun structure penetrates through the first through hole and then is electrically connected with the transmission joint.
In one embodiment, the balun structure includes a first conductor, a second conductor, a balun impedance, and a coaxial cable; one end of the first conductor is electrically connected with the first feed point, and the other end of the first conductor is electrically connected with the outer conductor of the coaxial cable; one end of the second conductor is electrically connected with the second feed point, and the other end of the second conductor is electrically connected with the inner conductor of the coaxial cable; the coaxial cable is electrically connected with the transmission connector; the first conductor and the second conductor are electrically connected through the balun impedance.
In one embodiment, the partial discharge ultrahigh frequency monitoring assembly further comprises a metal shield; the metal shielding cover is arranged on the second side face, a window is arranged on the metal shielding cover, and the transmission joint is arranged in the metal shielding cover.
In one embodiment, the plate surface of the dielectric substrate is rectangular; the length of the dielectric substrate is a, and the width of the dielectric substrate is b; a is 150 mm-160 mm, and b is 150 mm-160 mm.
In one embodiment, the distance from the vertex of the first radiation patch close to the vertex angle part of the second radiation patch to the diagonal edge of the first radiation patch is S, and the length of the diagonal edge is L; s is 25 mm-35 mm, L is 150 mm-160 mm.
In one embodiment, the partial discharge uhf monitoring assembly further includes a support structure disposed between the bowtie antenna and the first side; the butterfly antenna is arranged on the first side surface through the supporting structure, and the supporting structure is arranged inside the insulating protective cover.
In one embodiment, the support structure comprises an insulating base plate disposed on the first side, and an insulating rod disposed on the insulating base plate; the butterfly antenna is arranged on the insulating rod.
The utility model provides a GIS equipment, GIS equipment includes partial discharge superfrequency monitoring subassembly, still includes major structure, major structure is provided with the medium window, the mouth edge of medium window is provided with the second ring flange, first ring flange with the second ring flange corresponds the connection, insulating protective cover passes the medium window stretches into inside the cavity of GIS equipment.
In the GIS equipment, after the first flange plate is arranged on the second flange plate, the insulating protective cover penetrates through the dielectric window and extends into the cavity of the GIS equipment, and the local ultrahigh frequency discharge signal of the GIS equipment is obtained through induction of the butterfly antenna, so that the product volume can be reduced, the structure is simple, the assembly is convenient, and the gain height and the frequency bandwidth can be realized; in addition, the first flange plate is a metal plate, so that electromagnetic interference outside the GIS equipment can be reduced, the GIS equipment has the advantages of strong anti-interference capability and wide monitoring frequency band, partial discharge ultrahigh frequency signals of the antenna can be better monitored, and the monitoring performance is more stable; in addition, the insulating protective cover covers the outer portion of the butterfly antenna, the butterfly antenna is protected, the induced potential between the butterfly antenna and high-voltage equipment can be isolated through insulating materials, deformation of the butterfly antenna due to long-time extrusion of air pressure in the GISS equipment can be prevented, partial discharge ultrahigh-frequency signals of the antenna can be well monitored, and monitoring performance is stable.
In one embodiment, the GIS device includes a plurality of first connectors; a plurality of first mounting holes are formed in the first flange plate, and a plurality of second mounting holes are formed in the second flange plate; the plurality of first mounting holes and the plurality of first connecting pieces are arranged in one-to-one correspondence with the plurality of second mounting holes; and the first connecting piece penetrates through the first mounting hole and the second mounting hole to fixedly connect the first flange plate and the second flange plate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an exploded view of a partial discharge UHF monitoring device according to an embodiment of the present invention;
FIG. 2 is an exploded view of a partial discharge UHF monitoring device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a butterfly antenna of the partial discharge UHF monitoring device according to an embodiment of the present invention;
FIG. 4 is a diagram of a balun structure of a partial discharge VHF monitoring module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a discharge model structure of a partial discharge gap according to an embodiment of the present invention;
FIG. 6 is a graph illustrating a Voltage Standing Wave Ratio (VSWR) curve simulation according to an embodiment of the present invention;
FIG. 7 is a partial discharge UHF signal collected by the partial discharge UHF monitoring module according to an embodiment of the present invention;
fig. 8 is a diagram of a spectrum analysis of a partial discharge uhf signal collected by the partial discharge uhf monitoring assembly according to an embodiment of the present invention.
10. A first flange plate; 11. a first via hole; 12. a first mounting hole; 13. a fourth mounting hole; 20. an insulating protective cover; 21. a recess; 22. a third mounting hole; 30. a butterfly antenna; 31. a dielectric substrate; 32. a first radiating patch; 321. a first feeding point; 33. a second radiating patch; 331. a second feeding point; 40. a balun structure; 41. a first conductor; 42. a second conductor; 43. a balun impedance; 44. a coaxial cable; 441. an outer conductor; 442. an inner conductor; 50. a transmission joint; 60. a metal shield case; 61. a window; 62. flanging; 70. a support structure; 71. an insulating base plate; 711. a second via hole; 72. an insulating rod; 81. a second connecting member; 82. a third connecting member; 91. a needle; 92. a plate electrode; 93. and (5) oil-immersed paper boards.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Referring to fig. 1 to 3, fig. 1 is an exploded schematic view of a partial discharge ultrahigh frequency monitoring device according to an embodiment of the present invention; FIG. 2 is an exploded view of a partial discharge VHF monitoring assembly according to an embodiment of the present invention; fig. 3 shows a structure diagram of the butterfly antenna 30 of the partial discharge uhf monitoring assembly according to an embodiment of the present invention. An embodiment of the present invention provides a partial discharge ultrahigh frequency monitoring device, including: a first flange plate 10, an insulating shield 20, and a butterfly antenna 30. The first flange 10 is a metal plate, and the first flange 10 is used for being correspondingly connected with a second flange (not shown) of a medium window of the GIS device. An insulating shield 20 is provided on a first side of the first flange 10, the insulating shield 20 being adapted to extend through the dielectric window into the interior of the chamber of the GIS device. The butterfly antenna 30 is disposed on the first side and inside the insulating shield 20.
After the first flange plate 10 is arranged on the second flange plate, the insulating protective cover 20 penetrates through the dielectric window and extends into the cavity of the GIS equipment, and the butterfly antenna 30 is used for sensing and acquiring a local ultrahigh frequency discharge signal of the GIS equipment, so that the product volume can be reduced, the structure is simple, the assembly is convenient, and the gain height and the frequency bandwidth can be realized; in addition, the first flange plate 10 is a metal plate, so that electromagnetic interference outside the GIS equipment can be reduced, the GIS equipment has the advantages of strong anti-interference capability and wide monitoring frequency band, partial discharge ultrahigh frequency signals of the antenna can be better monitored, and the monitoring performance is more stable; in addition, the insulating protective cover 20 covers the butterfly antenna 30 to protect the butterfly antenna 30, and can also isolate the induced potential between the butterfly antenna 30 and the high-voltage equipment by using an insulating material, and prevent the butterfly antenna 30 from deforming due to long-time extrusion of the air pressure in the GISS equipment, so that the partial discharge ultrahigh-frequency signal of the antenna can be better monitored, and the monitoring performance is stable.
Specifically, the insulation shield 20 is, for example, an insulation block, a concave portion 21 having an opening corresponding to the volume size of the butterfly antenna 30 is provided on the surface of the insulation block facing the first side surface, and the butterfly antenna 30 is provided in the concave portion 21, so that the volume size of the insulation block can be made sufficiently small, and the volume size of the insulation shield 20 can be greatly reduced while satisfying the wall thickness thereof. Specifically, the insulating shield 20 is, for example, a teflon body, or other insulating material bodies are selected as necessary.
Referring to fig. 1, fig. 3 and fig. 4, fig. 4 is a structural diagram of a balun structure 40 of the partial discharge ultrahigh frequency monitoring device according to an embodiment of the present invention. In one embodiment, the partial discharge vhf monitoring assembly further includes a balun structure 40 and a transmission connector 50. The butterfly antenna 30 includes a dielectric substrate 31, and a first radiation patch 32 and a second radiation patch 33 spaced and symmetrically disposed on the dielectric substrate 31. The first radiation patch 32 and the second radiation patch 33 are both triangular in shape. The first radiation patch 32 is provided with a first feeding point 321 near the top corner of the second radiation patch 33, and the second radiation patch 33 is provided with a second feeding point 331 near the top corner of the first radiation patch 32. The first feeding point 321 and the second feeding point 331 are electrically connected to the balun structure 40. The first flange plate 10 is provided with a first through hole 11, the transmission connector 50 is arranged on the second side surface of the first flange plate 10, and the balun structure 40 is electrically connected with the transmission connector 50 after passing through the first through hole 11. Thus, in operation, the first radiation patch 32 and the second radiation patch 33 function to commonly receive the uhf discharge signal. The first radiating patch 32 and the second radiating patch 33 are symmetrical structures, and belong to a balanced transmission antenna. In addition, by connecting the first radiation patch 32 and the second radiation patch 33 with the transmission connector 50 through the balun structure 40, the balun structure 40 can be used for adjusting impedance balance, so that the conversion from unbalanced transmission to balanced transmission is realized, and the impedance matching between the butterfly antenna 30 and the coaxial cable 44 of the balun structure 40 reaches 50 Ω, thereby improving the performance of the antenna.
Specifically, the transmission connector 50 is, for example, an SMA connector, and the SMA connector adopts an N-female connector. The N female heads can be in butt joint with SMA joints of external related equipment, so that signal transmission is realized. The dielectric substrate 31 is specifically made of FR4 dielectric material, for example, but other materials may be used, and the materials are not limited herein and may be selected according to actual requirements. In addition, the first radiation patch 32 and the second radiation patch 33 are both specifically metal radiation pieces such as copper, aluminum, gold, and the like.
It should be noted that the first radiation patch 32 and the second radiation patch 33 in the butterfly antenna 30 are not limited to the triangular radiation patches described above, and may also be other irregular radiation patches, for example, more than two triangular radiation patches that are sequentially connected, or a combination of a triangular radiation patch and a square radiation patch, or other forms, which are not limited herein, and are selected according to actual requirements.
Referring to fig. 1, 3 and 4, in one embodiment, the balun structure 40 includes a first conductor 41, a second conductor 42, a balun impedance 43 and a coaxial cable 44. One end of the first conductor 41 is electrically connected to the first feeding point 321, and the other end of the first conductor 41 is electrically connected to the outer conductor 441 of the coaxial cable 44. One end of the second conductor 42 is electrically connected to the second feeding point 331, and the other end of the second conductor 42 is electrically connected to the inner conductor 442 of the coaxial cable 44. The coaxial cable 44 is electrically connected to the transmission connector 50. The first conductor 41 and the second conductor 42 are electrically connected through a balun impedance 43. Thus, the first conductor 41, the second conductor 42 and the balun impedance 43 match the impedance of the coaxial cable 44, thereby playing a balance role. In addition, the first radiating patch 32 is grounded via the first conductor 41 and the outer conductor 441 of the coaxial cable 44, and the second radiating patch 33 transmits the sensed uhf discharge signal to the outside via the second conductor 42 and the inner conductor 442 of the coaxial cable 44.
Referring to fig. 1 and 2, in one embodiment, the partial discharge uhf monitoring assembly further includes a metal shield 60. The metal shielding cover 60 is disposed on the second side surface, a window 61 is disposed on the metal shielding cover 60, and the transmission connector 50 is disposed inside the metal shielding cover 60. In this way, the metallic shield 60 can avoid electromagnetic interference and the influence on the collected uhf signals. In addition, specifically, the metal shielding case 60 is made of 6061 aluminum alloy, which has excellent processing properties, excellent welding characteristics, electroplating properties, excellent corrosion resistance, high toughness, no deformation after processing, compact and defect-free material, easy polishing, easy coloring, excellent oxidation effect, and the like, and the metal shielding case 60 may be made of other metal materials, which is not limited herein. Similarly, the first flange 10 may be made of 6061 aluminum alloy material similarly to the metal shielding can 60, but other metal materials may be used, which is not limited herein.
Referring to fig. 3, in one embodiment, the dielectric substrate 31 has a rectangular plate surface. The length of the dielectric substrate 31 is a and the width of the dielectric substrate 31 is b. a is 150 mm-160 mm, and b is 150 mm-160 mm. Specifically, a is 156.27mm, for example, and b is 155.92mm, for example. In addition, the thickness c of the dielectric substrate 31 is, for example, 2mm to 20mm, specifically, for example, 2.3mm, and the thickness c of the dielectric substrate 31 may also be other values, which are not limited herein and are set according to actual requirements.
Referring to fig. 3, in one embodiment, the distance from the vertex of the first radiation patch 32 close to the vertex of the second radiation patch 33 to the diagonal edge is S, and the length of the diagonal edge is L; s is 25 mm-35 mm, L is 150 mm-160 mm. Specifically, L is 154mm, for example, and S is 31.86mm, for example. It should be noted that the second radiation patch 33 is similar to the first radiation patch 32, and is not described in detail herein.
Referring to fig. 1 and 2, in one embodiment, the partial discharge uhf monitoring assembly further includes a support structure 70 disposed between the bowtie antenna 30 and the first side. The butterfly antenna 30 is arranged on the first side by a support structure 70, the support structure 70 being arranged inside the insulating shield 20.
Referring to fig. 1 and 2, in one embodiment, the supporting structure 70 includes an insulating base plate 71 disposed on the first side, and an insulating rod 72 disposed on the insulating base plate 71. The butterfly antenna 30 is disposed on the insulating rod 72. In this way, the insulation rod 72 supports the butterfly antenna 30 such that a desired predetermined interval is provided between the butterfly antenna 30 and the first side. In addition, insulating bottom plate 71 passes through the installed parts such as insulating screw, insulating pin and locates fixedly on first side, and insulating rod 72 one end is fixed to be set up on insulating bottom plate 71, and the insulating rod 72 other end is fixed to be set up on butterfly antenna 30 to can make butterfly antenna 30 installation stability better, thereby can the permanent temperature operation, be difficult for damaging. In addition, the number of the insulating rods 72 is more than one, and for example, the number may be two, three or other numbers, and the number may be set according to actual requirements. As a specific example, an end of the insulating rod 72 is fixedly provided on the dielectric substrate 31 of the bowtie antenna 30 by a mounting member such as an insulating screw, an insulating pin, or the like.
Referring to fig. 1 and fig. 2, in order to avoid the coaxial cable 44, the insulating base 71 is further provided with a second via 711. The second via hole 711 is disposed corresponding to the first via hole 11, so that the coaxial cable 44 of the balun structure 40 can sequentially pass through the second via hole 711 and the first via hole 11 to be led out and connected to the output connector.
It should be noted that the "insulating rod 72" may be a part of the "insulating base plate 71", that is, the "insulating rod 72" and the "other part of the insulating base plate 71" are integrally formed; or a separate member that can be separated from the other part of the insulating base plate 71, i.e., the insulating rod 72 can be manufactured separately and then combined with the other part of the insulating base plate 71 into a whole. In one embodiment, the "insulating rod 72" is a part of the "insulating base plate 71" that is integrally formed.
Referring to fig. 1 to fig. 3, in an embodiment, a GIS device includes the partial discharge ultrahigh frequency monitoring device of any of the above embodiments, and further includes a main structure (not shown). The main body structure is provided with a medium window (not shown in the figure), a second flange (not shown in the figure) is arranged on the opening edge of the medium window, the first flange 10 is correspondingly connected with the second flange, and the insulating protective cover 20 penetrates through the medium window and extends into the cavity of the GIS equipment.
In the GIS equipment, after the first flange plate 10 is arranged on the second flange plate, the insulating protective cover 20 penetrates through the dielectric window and extends into the cavity of the GIS equipment, and the local ultrahigh frequency discharge signal of the GIS equipment is obtained through induction by the butterfly antenna 30, so that the product volume can be reduced, the structure is simple, the assembly is convenient, and the gain height and the frequency bandwidth can be realized; in addition, the first flange plate 10 is a metal plate, so that electromagnetic interference outside the GIS equipment can be reduced, the GIS equipment has the advantages of strong anti-interference capability and wide monitoring frequency band, partial discharge ultrahigh frequency signals of the antenna can be better monitored, and the monitoring performance is more stable; in addition, the insulating protective cover 20 covers the butterfly antenna 30 to protect the butterfly antenna 30, and can also isolate the induced potential between the butterfly antenna 30 and the high-voltage equipment by using an insulating material, and prevent the butterfly antenna 30 from deforming due to long-time extrusion of the air pressure in the GISS equipment, so that the partial discharge ultrahigh-frequency signal of the antenna can be better monitored, and the monitoring performance is stable.
Referring to fig. 1 and 2, in one embodiment, the GIS device includes a plurality of first connectors (not shown). The first flange 10 is provided with a plurality of first mounting holes 12, and the second flange is provided with a plurality of second mounting holes (not shown). The plurality of first mounting holes 12 and the plurality of first connecting pieces are arranged in one-to-one correspondence with the plurality of second mounting holes. Specifically, the number of the first mounting holes 12 illustrated in fig. 1 is, for example, 12, and accordingly, the number of the first connecting pieces and the number of the second mounting holes are, for example, 12. The first connecting member passes through the first mounting hole 12 and the second mounting hole to fixedly connect the first flange 10 and the second flange. Specifically, the first connecting member is, for example, an insulating bolt, an insulating pin, an insulating screw, or the like, and the first mounting hole 12 and the second mounting hole are mounting holes corresponding to the first connecting member. After a plurality of first connecting pieces are correspondingly loaded into a plurality of first mounting holes 12 and a plurality of second mounting holes respectively, on one hand, the first flange plate 10 and the second flange plate can be firmly combined together, on the other hand, better sealing performance can be ensured, and the sulfur fluoride gas in the cavity of the GIS equipment is prevented from leaking outwards through the second flange plate.
Referring to fig. 1 and 2, a plurality of third mounting holes 22 are further formed in the insulating protective cover 20, and a plurality of fourth mounting holes 13 are formed in the first side surface and are in one-to-one correspondence with the plurality of third mounting holes 22. The insulation shield 20 is fixedly mounted on the first side surface after correspondingly passing through the plurality of third mounting holes 22 and entering the plurality of fourth mounting holes 13 through the plurality of second connectors 81. Thus, the insulation shield 20 can be stably mounted on the first side surface. In addition, when the butterfly antenna 30 needs to be maintained or replaced, the second connecting member 81 is removed to open the insulating protective cover 20, so that the operation is convenient.
Referring to fig. 1 and 2, further, a flange 62 is disposed along the opening edge of the insulation shield 20, and the flange 62 is fixedly mounted on the second side surface, for example, by at least one third connecting member 82.
In order to verify the antenna performance of the partial discharge ultrahigh frequency monitoring device in the above embodiment, please refer to fig. 5, in which fig. 5 illustrates a schematic structural diagram of a discharge model of a partial discharge air gap according to an embodiment of the present invention, and an electrode system is a pin 91-plate electrode 92. The air gap is composed of an insulating paper board (specifically, for example, oil-impregnated paper board 93) with a diameter of 80mm and a thickness of 0.5mm, the diameter of the needle 91 is 1mm, the curvature radius of the needle tip is 200 μm, the oil-impregnated paper board 93 is placed between the needle 91 and the plate electrode 92, and the gap during the test is about 3 mm. During the test, the artificial oilpaper insulation defect model is immersed in the insulating oil for partial discharge measurement.
Referring to fig. 6 to 8 again, fig. 6 is a graph showing a simulation of Voltage Standing Wave Ratio (VSWR) curves according to an embodiment of the present invention; FIG. 7 illustrates a partial discharge UHF signal collected by the partial discharge UHF monitoring assembly in accordance with one embodiment of the present invention; fig. 8 shows a spectrum analysis diagram of the partial discharge uhf signal collected by the partial discharge uhf monitoring assembly according to an embodiment of the present invention. As shown in fig. 6, the Voltage Standing Wave Ratio (VSWR) is less than 5 in the range of 300MHz to 1.5GHz, wherein the voltage standing wave ratio is the smallest at 500MHz, so that the transmission power of the partial discharge ultrahigh frequency monitoring component is high when monitoring the partial discharge of the GIS device, and the electromagnetic wave signal can be well received. As shown in fig. 7, the partial discharge ultrahigh frequency monitoring component can monitor the partial discharge ultrahigh frequency signal of the GIS device. As shown in fig. 8, through the spectrum analysis of the partial discharge ultrahigh frequency signal of the partial discharge ultrahigh frequency monitoring component, the working frequency point of the partial discharge ultrahigh frequency monitoring component is 500MHz, which indicates that the monitoring performance of the partial discharge ultrahigh frequency monitoring component is better, and the partial discharge ultrahigh frequency signal can be well monitored.
In summary, the present embodiment is mainly used for monitoring and extracting partial discharge ultrahigh frequency signals of the GIS device, the volume size of the whole device structure is reduced by using the butterfly antenna 30, and the balun structure 40 is introduced to realize the conversion from imbalance to balance, so as to achieve 50 Ω impedance matching between the coaxial cable 44 and the antenna. In addition, the butterfly antenna 30 is packaged in the insulating protective cover 20, is not easily influenced by the external physical environment, has the advantages of small size, low cost, convenience in assembly and the like, and can meet the monitoring of partial discharge ultrahigh frequency signals in GIS equipment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Claims (10)
1. A partial discharge uhf monitoring assembly, the partial discharge uhf monitoring assembly comprising:
the first flange plate is a metal plate and is used for being correspondingly connected with a second flange plate of a medium window of the GIS equipment;
the insulating protective cover is arranged on the first side face of the first flange plate and used for penetrating through the dielectric window to extend into the cavity of the GIS equipment;
the butterfly antenna is arranged on the first side face and is positioned inside the insulating protective cover.
2. The partial discharge uhf monitoring assembly of claim 1, wherein the partial discharge vhf monitoring assembly further includes a balun structure and a transmission connection; the butterfly antenna comprises a dielectric substrate, a first radiating patch and a second radiating patch which are arranged on the dielectric substrate at intervals and symmetrically; the first radiation patch and the second radiation patch are both in a triangular shape; a first feeding point is arranged at the position, close to the vertex angle of the second radiation patch, of the first radiation patch, and a second feeding point is arranged at the position, close to the vertex angle of the first radiation patch, of the second radiation patch; the first feeding point and the second feeding point are electrically connected with the balun structure, a first through hole is formed in the first flange plate, the transmission joint is arranged on the second side face of the first flange plate, and the balun structure penetrates through the first through hole and then is electrically connected with the transmission joint.
3. The partial discharge uhf monitoring assembly of claim 2, wherein the balun structure includes a first conductor, a second conductor, a balun impedance and a coaxial cable; one end of the first conductor is electrically connected with the first feed point, and the other end of the first conductor is electrically connected with the outer conductor of the coaxial cable; one end of the second conductor is electrically connected with the second feed point, and the other end of the second conductor is electrically connected with the inner conductor of the coaxial cable; the coaxial cable is electrically connected with the transmission connector; the first conductor and the second conductor are electrically connected through the balun impedance.
4. The partial discharge uhf monitoring assembly of claim 2, wherein the partial discharge uhf monitoring assembly further includes a metal shield; the metal shielding cover is arranged on the second side face, a window is arranged on the metal shielding cover, and the transmission joint is arranged in the metal shielding cover.
5. The partial discharge ultrahigh frequency monitoring assembly according to claim 2, wherein the plate surface of the dielectric substrate is rectangular; the length of the dielectric substrate is a, and the width of the dielectric substrate is b; a is 150 mm-160 mm, and b is 150 mm-160 mm.
6. The partial discharge uhf monitoring assembly of claim 2, wherein the first radiating patch has a distance S from a vertex at a vertex position close to the second radiating patch to a diagonal edge thereof, the length of the diagonal edge being L; s is 25 mm-35 mm, L is 150 mm-160 mm.
7. The partial discharge uhf monitoring assembly of claim 1, further comprising a support structure disposed between the bowtie antenna and the first side; the butterfly antenna is arranged on the first side surface through the supporting structure, and the supporting structure is arranged inside the insulating protective cover.
8. The partial discharge uhf monitoring assembly of claim 7, wherein the support structure includes an insulating base plate disposed on the first side, and an insulating rod disposed on the insulating base plate; the butterfly antenna is arranged on the insulating rod.
9. The GIS equipment is characterized by comprising the partial discharge ultrahigh frequency monitoring assembly according to any one of claims 1 to 8 and further comprising a main structure, wherein the main structure is provided with a medium window, a second flange is arranged on the opening edge of the medium window, the first flange is correspondingly connected with the second flange, and the insulating protective cover penetrates through the medium window and extends into a cavity of the GIS equipment.
10. The GIS device of claim 9 wherein the GIS device comprises a plurality of first connectors; a plurality of first mounting holes are formed in the first flange plate, and a plurality of second mounting holes are formed in the second flange plate; the plurality of first mounting holes and the plurality of first connecting pieces are arranged in one-to-one correspondence with the plurality of second mounting holes; and the first connecting piece penetrates through the first mounting hole and the second mounting hole to fixedly connect the first flange plate and the second flange plate.
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| CN202110924962.6A CN113702818A (en) | 2021-08-12 | 2021-08-12 | GIS equipment and partial discharge ultrahigh frequency monitoring assembly |
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| CN202110924962.6A CN113702818A (en) | 2021-08-12 | 2021-08-12 | GIS equipment and partial discharge ultrahigh frequency monitoring assembly |
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