Partial discharge measurement antenna for double dielectric sleeve

Abstract

The application discloses a partial discharge measuring antenna of a double-medium sleeve, which comprises a base plate, a first antenna array, a first medium sleeve, a first sleeve, a second medium sleeve, a second sleeve and a supporting body in sequence and are connected in series, and the supporting body has a supporting function; through the double-medium composite sleeve structure, the effects of balancing current and increasing an antenna resonance point are achieved, the working bandwidth can be effectively expanded, the antenna radiation direction can be controlled, and the physical size of the antenna radiation can be compressed; the installation size requirement is small, the requirements of hidden and narrow space installation are met, and the antenna can be applied to various scenes; in addition, the above designed antenna can meet the requirements of vertical polarization and omnidirectional radiation in UHF and L working frequency bands, and the antenna gain is better.

Description

Technical Field

[0001] This invention relates to the field of partial discharge detection technology, and in particular to a partial discharge measurement antenna with a dual dielectric sleeve. Background Technology

[0002] In power systems, factors such as insulation defects and electrical stress can lead to partial discharges of varying degrees and forms. The resulting electromagnetic pulses can damage the internal insulation materials of the power system, causing insulation breakdown and resulting in electrical accidents. Similar problems can also occur in industries such as aerospace, automotive, and energy extraction. Therefore, there is a widespread need to monitor partial discharge signals to prevent accidents.

[0003] To address the aforementioned issues, the currently available effective device for partial discharge monitoring is the ultra-high frequency partial discharge sensor, which is an antenna radiation receiving device. This device operates in the 300MHz~1500MHz frequency band, spanning both UHF and L bands. It typically operates in the near-field and mid-field of antenna radiation, and is used to receive and capture partial discharge signals within the ultra-high frequency range and convert them into electrical signals. Spectral analysis and time-domain analysis are then performed on these signals to extract information and characteristics related to partial discharge activity.

[0004] Specifically, at the end of the 20th century, scholars M.D. Judd and O. Farish of the University of Strathclyde in the UK proposed a highly efficient measurement antenna for partial discharge applications. This antenna is actually a modified pole antenna system with a reflector disk and a metal capacitor disk loaded at the top. According to relevant literature, test results show that this antenna achieves relatively good reception performance when the size of the metal disk loaded at the top is greater than 150mm, but its performance drops sharply once it is less than 150mm. Another type of antenna commonly used in partial discharge measurements is various planar frequency-independent antennas, such as Archimedean spirals, sinc function antennas, or logarithmic spiral antennas. Currently, the spiral-type UHF partial discharge sensor developed by Toshiba Corporation of Japan is widely used, employing a standard double-arm Archimedean spiral antenna. The double-arm Archimedean spiral antenna, a type of ultra-wideband frequency-independent antenna, features double-arm radiation with a 180-degree phase difference, exhibiting relatively good radiation performance. However, standard Archimedean spiral antennas operating in the UHF band are physically large, making them unsuitable for miniaturized installations. Furthermore, PCB-manufactured antennas suffer from strong self-discharge interference under high-voltage environments, failing to adequately meet the requirements for partial discharge detection. With the increasing demands for miniaturization, portability, energy efficiency, and adaptability to various scenarios in modern technology, partial discharge detection devices must also meet specific requirements, including not only operational requirements but also embedded design, space constraints, and miniaturization. Designing a partial discharge measurement antenna that achieves miniaturization, wide bandwidth, high gain, and space-constrained installation is a crucial technical challenge for those skilled in the art. Summary of the Invention

[0005] According to an embodiment of the present invention, to overcome the above-mentioned deficiencies of the prior art, a partial discharge measurement antenna with dual dielectric sleeves is provided, comprising a chassis, a first antenna array, a first dielectric sleeve, a first sleeve, a second dielectric sleeve, a second sleeve, and a support body; the chassis has a first through hole; the first antenna array is a rotating body; the first dielectric sleeve is sleeved outside the first antenna array; the first sleeve is sleeved outside the first dielectric sleeve, and a first positioning plate is provided on the side of the first sleeve near the chassis; the second dielectric sleeve is sleeved outside the first sleeve, and one end of the second dielectric sleeve near the chassis is located on the side of the first positioning plate away from the chassis; the second sleeve is sleeved outside the second dielectric sleeve, and a second positioning plate is provided on the side of the second sleeve near the chassis, the second positioning plate and the first positioning plate are located in the same plane after installation, and the second positioning plate is located on the chassis; one end of the support body is located on the second positioning plate, and the other end supports the first antenna array.

[0006] Preferably, it further includes a second antenna array, which is a rotating body, and the second antenna array is partially embedded in the first antenna array; Preferably, the chassis is a disc, and the first through hole is opened at the center of the disc. The central axis of the first through hole is the rotational central axis of the first and second medium sleeves, the first and second sleeves, and the first and second antenna arrays.

[0007] Preferably, the first antenna array includes a solid frustum and an open shell. The bottom surface of the solid frustum with a smaller diameter is close to the chassis, and the shell is located on the bottom surface of the solid frustum with a larger diameter. The opening of the shell is circular and faces away from the chassis. A ring is provided at the opening. The ring is coaxial with the opening and the diameter of the ring is equal to that of the opening. A groove coupled to the solid frustum of the first antenna array is provided inside the first dielectric sleeve.

[0008] Preferably, the second antenna array comprises a coaxial cone and an ellipsoid, with the cone disposed within the housing of the first antenna array and the ellipsoid disposed at the end furthest from the first antenna array.

[0009] Preferably, the central axis of rotation of the cone of the second linear array lies in the secondary axis plane of the ellipsoid.

[0010] Preferably, the solid frustum has two base diameters of 4mm and 32mm, and a height of 34mm; the open shell is a hollow frustum shell with a wall thickness of 4mm and a height of 18mm; the circular opening has a diameter of 135mm, and the ring connected to the opening has a width of 20mm, with the ring having the same thickness as the open shell; the second antenna array has a cone base diameter of 25mm and a height of 45mm, and an ellipsoid with a major semi-axis of 50mm and a minor semi-axis of 10mm.

[0011] Preferably, the support includes a barrel body and a bottom flange and a top flange respectively located at both ends of the barrel body. The barrel body is fitted over the second sleeve, the bottom flange is located on the second positioning plate, and the top flange supports the opening shell of the first antenna array.

[0012] Preferably, the first medium sleeve and the second medium sleeve are stepped sleeves.

[0013] Preferably, the first medium sleeve includes a sleeve-shaped first step and a second step, the outer diameter of the first step being smaller than the outer diameter of the second step, and the outer diameter of the second step being the same as the inner diameter of the first sleeve; the second medium sleeve includes a sleeve-shaped third step and a fourth step, the outer diameter of the third step being smaller than the outer diameter of the fourth step, and the second medium sleeve is provided with a second through hole, the inner diameter of the second through hole being the same as the outer diameter of the first sleeve, and the outer diameter of the fourth step being the same as the inner diameter of the second sleeve.

[0014] Preferably, the outer diameters of the first, second, third, and fourth steps are 40mm, 45mm, 70mm, and 75mm, respectively, and the heights are 30mm, 15mm, 19mm, and 16mm, respectively. The wall thickness of the first and second sleeves is 2mm, and the heights are 30mm and 20mm, respectively. The thickness of the first and second positioning plates is 2mm, and the outer diameters are 55mm and 95mm, respectively.

[0015] Preferably, the first and second medium sleeves are made of nylon.

[0016] Preferably, the first and second sleeves are made of hard aluminum.

[0017] The partial discharge measurement antenna with a dual-dielectric sleeve according to embodiments of the present invention, by employing a dual-broadband array and a dual-dielectric composite sleeve structure, can balance the current, increase the antenna resonant point, effectively expand the operating bandwidth, control the antenna radiation direction, and compress the physical size of the antenna radiation. The structural design of the embodiments of the present invention allows for smaller installation size requirements, meeting the requirements for concealed and confined space installation, and is applicable to various scenarios. Furthermore, the antenna designed above can meet the requirements of vertical polarization and omnidirectional radiation in the UHF and L operating frequency bands, and has excellent antenna gain.

[0018] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the partial discharge measurement antenna with a dual dielectric sleeve according to an embodiment of the present invention; Figure 2 This is an exploded view of a partial discharge measurement antenna with a dual dielectric sleeve according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the first antenna element structure of the partial discharge measurement antenna with a dual dielectric sleeve according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the second antenna element structure of the partial discharge measurement antenna with a dual dielectric sleeve according to an embodiment of the present invention. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0021] First, combine Figures 1-4 This invention describes a dual-dielectric sleeve partial discharge measurement antenna, which is widely used in scenarios such as partial discharge monitoring. In this embodiment, an example is given where the installation and use are subject to certain space constraints.

[0022] like Figure 1 , 2 As shown, the partial discharge measurement antenna with dual dielectric sleeves according to an embodiment of the present invention has a chassis 8, a first antenna array 1, a first dielectric sleeve 4, a first sleeve 3, a second dielectric sleeve 6, a second sleeve 5, and a support body 7.

[0023] Specifically, such as Figure 1 , 2 As shown, the chassis 8 has a first through hole, reserving a certain space to facilitate the connection between the antenna array and the external RF connector 9; the first antenna array 1 is a rotating body, and the first dielectric sleeve 4 is fitted outside the first antenna array 1; the first sleeve 3 is fitted outside the first dielectric sleeve 4, and a first positioning plate is provided on the side of the first sleeve 3 near the chassis 8; the second dielectric sleeve 6 is fitted outside the first sleeve 3, and the end of the second dielectric sleeve 6 near the chassis 8 is located on the side of the first positioning plate away from the chassis 8; the second sleeve 5 is fitted outside the second dielectric sleeve 6, and a second positioning plate is provided on the side of the second sleeve 5 near the chassis 8. The above dual-dielectric composite sleeve structure can adjust the electrical properties of the antenna. Features, including resonant frequency, enable the antenna to resonate over a wider frequency band, increasing its operating bandwidth. This allows an antenna of the same size to cover a broader frequency range, reducing the need for complex designs and multiple antennas to cover different frequency bands. Furthermore, it allows for control of the radiated beam, making it more focused or directional, both contributing to a reduction in the overall antenna's physical size. The second positioning plate, after installation, is located in the same plane as the first positioning plate and is mounted on the chassis 8, facilitating positioning and fixation during installation. One end of the support body 7 is mounted on the second positioning plate, and the other end supports the first antenna array 1, enhancing antenna stability. By employing a dual-dielectric composite sleeve structure, the antenna meets performance requirements while having a smaller volume and size, making it suitable for applications with limited space or small requirements for antenna physical size.

[0024] Preferably, it also includes a second antenna array 2, which is a rotating body and partially embedded in the first antenna array 1. The dual array design can achieve a balanced distribution of current in the array, so as to avoid the current from concentrating in a specific area, reduce the conductor length required for current distribution, and thus reduce the size of the antenna. The dual broadband array has a better current balancing effect and better technical performance.

[0025] Preferably, such as Figure 2 As shown, the chassis 8 is a disc, and the first through hole is opened at the center of the disc. The central axis of the first through hole is the rotational central axis of the first dielectric sleeve 4, the second dielectric sleeve 6, the first sleeve 3, the second sleeve 5, the first antenna element 1, and the second antenna element 2. The entire antenna structure is a rotating body structure, and all components share the same central axis with the chassis 8, realizing omnidirectional radiation and making the structure more compact.

[0026] Preferably, such as Figure 3 As shown, the first antenna array 1 includes a solid frustum and an open shell. The smaller diameter bottom surface of the solid frustum is close to the chassis 8, and the shell is located on the larger diameter bottom surface of the solid frustum. The opening of the shell is circular and faces away from the chassis 8. A ring is provided at the opening, and the ring is coaxial with the opening. The ring can be thin-skinned and have a diameter equal to the opening; or it can be a three-dimensional concentric ring with a circular cross-section. In this case, the diameter of the concentric circles of the ring is equal to the opening. The diameter of the larger circle on the outer side of the ring is equal to the opening diameter plus 0.03 times the wavelength, and the diameter of the smaller circle on the inner side of the ring is equal to the opening diameter minus 0.03 times the wavelength. The first dielectric sleeve 4 has a groove inside that couples with the solid frustum of the first antenna array 1. By adopting the combined structure of the solid frustum and the open shell, a wider frequency band resonance characteristic can be achieved, enabling the antenna to have higher efficiency over a wider frequency range and achieve better directional control.

[0027] Preferably, such as Figure 4 As shown, the second antenna array 2 includes a coaxial cone and an ellipsoid. The cone is located inside the housing of the first antenna array 1. The first antenna array 1 and the second antenna array 2 are coaxial. The ellipsoid is located at the end away from the first antenna array 1, which is the top of the entire antenna. As the main structure for radiation and reception, it can concentrate electromagnetic wave energy, improve the antenna's radiation efficiency and reception sensitivity, thereby increasing the signal strength and quality.

[0028] Preferably, such as Figure 4 As shown, the rotation center axis of the cone of the second linear array 2 is located in the secondary axis plane of the ellipsoid. The transmission and radiation of the signal inside the antenna are uniform, which can effectively reduce signal loss and make the design more compact.

[0029] Preferably, the overall height and dimensional relationships of the two antenna arrays are adjusted. In practical operation, the specific dimensions are designed based on the wavelength at the center frequency point within the operating frequency band. An effective design structure is as follows: the diameters of the two base surfaces of the solid frustum are 0.012 and 0.12 times the wavelength, respectively, and the height is 0.102 times the wavelength. The open shell is a hollow frustum-shaped shell with a wall thickness of 0.012 times the wavelength, a height of 0.066 times the wavelength, and a circular opening diameter of 0.45 times the wavelength; the opening extends further towards the top of the antenna to a height of 0.06 times the wavelength, which is the width of the top ring. The second antenna array 2 is installed in series with the first antenna array along the antenna axis. The diameter of the bottom of the cone is 0.03 times the wavelength, the height is 0.18 times the wavelength, and the major axis of the ellipsoid at the top is 0.36 times the wavelength, and the minor axis is 0.09 times the wavelength. Preferably, a commonly used and effective structural dimension is as follows: the diameters of the two bases of the solid frustum are 4mm and 32mm respectively, and the height is 34mm; the open shell is a hollow frustum shell with a wall thickness of 4mm and a height of 18mm; the diameter of the circular opening is 125mm, and the diameter of the concentric circle of the ring connected to the opening is equal to the diameter of the opening, with the larger circle diameter of the ring being 135mm and the smaller circle diameter being 115mm; the diameter of the bottom of the cone of the second antenna array 2 is 25mm, the height is 45mm, the major semi-axis of the ellipsoid is 50mm, and the minor semi-axis is 10mm. At this point, the antenna has good transmission efficiency and transmission capability, effectively reduces signal loss and reflection, and achieves higher gain.

[0030] Preferably, such as Figure 2 As shown, the support body 7 includes a barrel body and bottom flanges and top flanges respectively located at both ends of the barrel body. The barrel body is fitted over the second sleeve 5, the bottom flange is located on the second positioning plate, and the top flange supports the open shell of the first antenna array 1. The structure has high strength and can provide good support. The diameter of the barrel body of the support body 7 is 0.24~0.57 times the wavelength, the height is 0.114 times the wavelength, and the wall thickness is 0.006~0.045 times the wavelength. The inner diameter of the bottom flange is connected to the outer surface of the barrel body, the outer diameter of the bottom flange is the length of the outer diameter of the barrel body plus 0.03~0.3 times the wavelength, and the thickness is 0.006~0.06 times the wavelength. The inner surface of the top flange is connected to the open shell of the first antenna array, and the height is 0.022~0.06 times the wavelength. Furthermore, the support body 7 can be made of nylon medium in one piece. The lower surface of the bottom flange is flush with the upper surface of the bottom edge of the second sleeve 5. The inner surface is coaxially and tightly attached to the outer surface of the second sleeve 5. The diameter of the barrel is 82mm, the height is 88mm, and the wall thickness is 5mm. The inner diameter of the bottom flange is the same as the outer diameter of the barrel, and the outer diameter of the bottom flange is 10mm longer than the outer diameter of the barrel. Its thickness is 10mm. The top flange is a hollow frustum shape coupled with the open shell part, and its height is 12mm.

[0031] Preferably, such as Figure 2As shown, the first dielectric sleeve 4 and the second dielectric sleeve 6 are stepped sleeves, which are beneficial for enhancing the electric field distribution and expanding the bandwidth in the partial discharge measurement antenna.

[0032] Preferably, the first dielectric sleeve 4 includes a sleeve-shaped first step and a second step, the outer diameter of the first step being smaller than the outer diameter of the second step, and the outer diameter of the second step being the same as the inner diameter of the first sleeve 3; the second dielectric sleeve 6 includes a sleeve-shaped third step and a fourth step, the outer diameter of the third step being smaller than the outer diameter of the fourth step, and a second through hole is provided inside the second dielectric sleeve 6, the inner diameter of the second through hole being the same as the outer diameter of the first sleeve 3, and the outer diameter of the fourth step being the same as the inner diameter of the second sleeve 5. The structural design of matching the size and shape of the dielectric sleeve and the sleeve will affect the electric field distribution, radiation effect, impedance matching, etc. of the antenna. By adopting the matching method of the above scheme, the performance of the antenna can be improved, its working effect optimized, and the antenna has good structural stability, and can work stably and reliably in complex working environments.

[0033] Preferably, the external design, diameter, and height dimensions of the first dielectric sleeve 4 and the second dielectric sleeve 6 are adjusted to further optimize the relevant technical performance. The diameter of the first sleeve 3 is 0.15 times the wavelength, and the height is 0.069 times the wavelength; the diameter of the second sleeve 5 is 0.234 times the wavelength, and the height is 0.069 times the wavelength; the outer diameter of the second positioning disk is 0.3003 times the wavelength; the first step diameter of the first dielectric sleeve 4 is 0.138 times the wavelength, and the height is 0.069 times the wavelength; the second step diameter is 0.15 times the wavelength, and the height is 0.043 times the wavelength; the third step diameter of the second dielectric sleeve 6 is 0.222 times the wavelength, and the height is 0.063 times the wavelength; the fourth step diameter is 0.234 times the wavelength, and the height is 0.059 times the wavelength. Specifically, the outer diameters of the first, second, third, and fourth steps are 40mm, 45mm, 70mm, and 75mm, respectively, and the heights are 30mm, 15mm, 19mm, and 16mm, respectively. The wall thickness of the first sleeve 3 and the second sleeve 5 are both 2mm, and the heights are 30mm and 20mm, respectively. The thickness of the first and second positioning plates is both 2mm, and the outer diameters are 55mm and 95mm, respectively.

[0034] Furthermore, such as Figure 1As shown, considering the overall shape and structural design of the first antenna array 1 and the second antenna array 2, the base 8 is a disk with a diameter of 0.78~1.65 times the wavelength and a thickness of 0.06~0.15 times the wavelength, made of hard aluminum. Preferably, the diameter of the base 8 is 220mm and the thickness is 20mm. The size of the first through hole at the center of the disk is adapted to the conductor size of the RF connector 9. Typically, the universal N-50KFD48 RF connector 9 is used for installation, and the size of the first through hole matches it. Correspondingly, a solid frustum of the first antenna array 1 has a hole at the geometric center of the bottom surface near one end of the base 8. A threaded hole with a diameter of M3 and a depth of 10mm is provided to connect to the inner conductor of the external RF connector 9. Similarly, a through hole with a diameter of M3 is also opened in the first dielectric sleeve 4. The apex of the cone of the second antenna array 2 can be appropriately rounded or ground flat to form a smaller planar cross section, which can better nest with the first antenna array 1. Preferably, the cross section is a circle with a top diameter of 0.09 times the wavelength, that is, a diameter of 10mm. Several positioning holes are opened on the first positioning plate. Preferably, the positioning holes are evenly spaced around the circumference of the first positioning plate, with a total of 8 holes, which are positioning through holes with a size of M3.

[0035] Preferably, the first dielectric sleeve 4 and the second dielectric sleeve 6 are made of nylon, and the first sleeve 3 and the second sleeve 5 are made of hard aluminum. As commonly used metals and insulating materials, they have good machinability and thermal stability, and low loss factor, which can meet the performance requirements of partial discharge measurement antennas in terms of sensitivity, frequency response, etc.

[0036] When using, such as Figures 1-4 As shown, based on receiving radio frequency signals generated by partial discharge, the electromagnetic waves generated by partial discharge propagate in electrical equipment. The measuring antenna receives these radio frequency signals and transmits them to the measuring equipment for analysis. In particular, in some cases, the second linear array 2 can be omitted, and only the first linear array 2 can be used alone to achieve certain technical effects. The use of dual broadband arrays and a dual dielectric composite sleeve structure balances the current, increases the antenna resonant point, and achieves better technical effects.

[0037] Above, refer to Figures 1-4 This paper describes a partial discharge measurement antenna with a dual-dielectric sleeve according to an embodiment of the present invention. By employing a dual-broadband array and a dual-dielectric composite sleeve structure, it achieves current balancing and increases the antenna resonant point, effectively expanding the operating bandwidth, controlling the antenna radiation direction, and compressing the physical size of the antenna radiation. The installation size requirement is small, meeting the requirements for concealed installation in narrow spaces, and it is applicable to various scenarios. Furthermore, the antenna design described above can meet the requirements of vertical polarization and omnidirectional radiation in the UHF and L operating frequency bands, and the antenna gain is excellent.

[0038] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A partial discharge measurement antenna with a dual dielectric sleeve, characterized in that, Include: The chassis has a first through hole; The first antenna array is a rotating body; A first dielectric sleeve is fitted outside the first antenna array; A first sleeve is fitted over the first medium sleeve, and a first positioning plate is provided on the side of the first sleeve near the chassis; The second medium sleeve is sleeved outside the first sleeve, and one end of the second medium sleeve near the chassis is located on the side of the first positioning plate away from the chassis; The second sleeve is sleeved on the outside of the second medium sleeve. The second sleeve is provided with a second positioning plate on the side near the chassis. The second positioning plate and the first positioning plate are located in the same plane after installation. The second positioning plate is located on the chassis. A support body, one end of which is disposed on the second positioning disk, and the other end of which supports the first antenna array; The second antenna array is a rotating body, and part of the second antenna array is embedded within the first antenna array; The first antenna array includes a solid frustum and an open housing. The smaller diameter bottom surface of the solid frustum is close to the chassis. The housing is disposed on the larger diameter bottom surface of the solid frustum. The opening of the housing is circular and faces away from the chassis. A ring is provided at the opening. The ring is coaxial with the opening and the diameter of the ring is equal to that of the opening. The first dielectric sleeve has a groove that couples with the solid frustum of the first antenna array. The second antenna array comprises a coaxial cone and an ellipsoid, the cone being disposed within the housing of the first antenna array, and the ellipsoid being disposed at one end away from the first antenna array.

2. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 1, characterized in that, The chassis is a disc, and the first through hole is opened at the center of the disc. The central axis of the first through hole is the rotational central axis of the first and second medium sleeves, the first and second sleeves, and the first and second antenna arrays.

3. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 1, characterized in that, The rotational center axis of the cone of the second antenna array lies within the secondary axis plane of the ellipsoid.

4. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 3, characterized in that, The solid frustum has two base diameters of 4mm and 32mm, and a height of 34mm; the open shell is a hollow frustum shell with a wall thickness of 4mm and a height of 18mm; the circular opening has a diameter of 135mm, and the ring connected to the opening has a width of 20mm, with the ring having the same thickness as the open shell; the second antenna array has a cone base diameter of 25mm and a height of 45mm, and the ellipsoid has a major semi-axis of 50mm and a minor semi-axis of 10mm.

5. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 1, characterized in that, The support body includes a barrel body and a bottom flange and a top flange respectively located at both ends of the barrel body. The barrel body is fitted over the second sleeve, the bottom flange is located on the second positioning plate, and the top flange supports the opening shell of the first antenna array.

6. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 1, characterized in that, The first medium sleeve and the second medium sleeve are stepped sleeves.

7. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 6, characterized in that, The first medium sleeve includes a sleeve-shaped first step and a second step, the outer diameter of the first step being smaller than the outer diameter of the second step, and the outer diameter of the second step being the same as the inner diameter of the first sleeve; the second medium sleeve includes a sleeve-shaped third step and a fourth step, the outer diameter of the third step being smaller than the outer diameter of the fourth step, and the second medium sleeve is provided with a second through hole, the inner diameter of the second through hole being the same as the outer diameter of the first sleeve, and the outer diameter of the fourth step being the same as the inner diameter of the second sleeve.

8. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 1, characterized in that, The first and second medium sleeves are made of nylon.

9. The partial discharge measurement antenna with a dual dielectric sleeve as described in claim 1, characterized in that, The first and second sleeves are made of hard aluminum.

Images