Flexible UHF sensor for partial discharge detection and its application

Abstract

The present invention provides a flexible ultra-high frequency sensor for partial discharge detection and its application, which can be applied to the field of partial discharge detection technology. The flexible ultra-high frequency sensor comprises: a flexible substrate, a radiation area, a grounding area and a feeder area; wherein the radiation area comprises a main radiation area and a plurality of auxiliary radiation areas, the main radiation area is a rectangle, the plurality of auxiliary radiation areas are distributed on the periphery of the main radiation area, the auxiliary radiation area is in the shape of an isosceles right triangle, the main radiation area and the auxiliary radiation area are an integrated structure, and the hypotenuse of the auxiliary radiation area is connected to the main radiation area.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge detection, and more specifically, to a flexible ultra-high frequency sensor for partial discharge detection and application thereof. Background Art

[0002] Gas Insulation Switchgear (GIS) is a SF 6 As an insulating gas switchgear, GIS has the advantages of small footprint, high safety and reliability, strong environmental adaptability, and low maintenance workload. Partial discharge may occur in GIS equipment during use, and if it is not discovered in time, it will develop into a breakdown discharge fault.

[0003] In the process of realizing the concept of the present invention, the inventors found that there are at least the following problems in the related art: the use of the partial discharge detection sensor in the related art has limitations and cannot effectively detect partial discharge. Summary of the invention

[0004] In view of this, the present invention provides a flexible ultra-high frequency sensor for partial discharge detection and application thereof.

[0005] One aspect of the present invention provides a flexible UHF sensor for partial discharge detection, the flexible UHF sensor comprising a flexible substrate, a radiation area, a grounding area and a feeder area;

[0006] Among them, the above-mentioned radiation zone includes a main radiation zone and multiple auxiliary radiation zones, the above-mentioned main radiation zone is a rectangle, and the multiple auxiliary radiation zones are distributed on the periphery of the above-mentioned main radiation zone. The shape of the above-mentioned auxiliary radiation zone is an isosceles right triangle. The above-mentioned main radiation zone and the above-mentioned auxiliary radiation zone are an integrated structure, and the hypotenuse of the above-mentioned auxiliary radiation zone is connected to the above-mentioned main radiation zone.

[0007] According to an embodiment of the present invention, two corners of the main radiation area close to the feeder area are rounded corners, and a groove area is provided on one side of the main radiation area close to the feeder area.

[0008] According to an embodiment of the present invention, the radiation area includes a plurality of feeding points, the feeding points are arranged at the edge of the groove area, and the radiation area and the feed line area are an integrated structure.

[0009] According to an embodiment of the present invention, two corners of the main radiation area close to the feeder area are rounded corners, the grounding area and the feeder area are located on one side of the flexible substrate, the radiation area is located on the other side of the flexible substrate, and the radiation area and the feeder area are coupled.

[0010] According to an embodiment of the present invention, the flexible substrate comprises a first flexible region, a second flexible region and a flexible connection region, the first flexible region and the second flexible region are connected via the flexible connection region, and the first flexible region, the second flexible region and the flexible connection region make the flexible substrate U-shaped;

[0011] The radiation area and the feeder area are located in the first flexible area, and the grounding area is located in the first flexible area, the flexible connection area and the second flexible area.

[0012] According to an embodiment of the present invention, the radiation zones include two, and adjacent sides of the two radiation zones are complementary structures.

[0013] According to an embodiment of the present invention, the feeder area includes a plurality of straight segments and a plurality of bending segments.

[0014] According to an embodiment of the present invention, a rectangular hollow area is arranged inside the main radiation area.

[0015] According to an embodiment of the present invention, the material of the flexible substrate is polyimide, and the materials of the radiation area, the grounding area and the feeder area are all copper.

[0016] Another aspect of the present invention provides an application of the flexible UHF sensor as described above in partial discharge detection.

[0017] According to an embodiment of the present invention, a serrated protrusion is provided on the periphery of the radiation zone so that the periphery presents a periodic self-similar structure, thereby extending the circumference of the periphery of the radiation zone and providing a longer flow path for the surface current, thereby saving the area of ​​the flexible substrate, further reducing the volume of the flexible UHF sensor, and improving the low-frequency performance of the flexible UHF sensor. The use of a flexible substrate also increases the flexibility of use of the flexible UHF sensor, so that the flexible UHF sensor can be more flexibly used in a compact space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0019] Figure 1 A block diagram of a flexible UHF sensor for partial discharge detection according to an embodiment of the present invention is shown;

[0020] Figure 2 A front structural diagram of a flexible ultra-high frequency sensor for partial discharge detection according to an embodiment of the present invention is shown;

[0021] Figure 3AA front structural diagram of a flexible ultra-high frequency sensor for partial discharge detection according to another embodiment of the present invention is shown;

[0022] Figure 3B It is shown that according to the present invention Figure 3A A side structural diagram of a flexible UHF sensor for partial discharge detection shown in an embodiment;

[0023] Figure 4A A front structural diagram of a flexible ultra-high frequency sensor for partial discharge detection according to another embodiment of the present invention is shown;

[0024] Figure 4B A front structural diagram of a flexible ultra-high frequency sensor for partial discharge detection according to another embodiment of the present invention is shown;

[0025] Figure 5A A voltage standing wave ratio curve diagram of a flexible UHF sensor in a non-bending state according to an embodiment of the present invention is shown;

[0026] Figure 5B A voltage standing wave ratio curve diagram of a flexible UHF sensor according to an embodiment of the present invention when the bending radius is 25 cm is shown;

[0027] Figure 5C A voltage standing wave ratio curve of the flexible UHF sensor according to an embodiment of the present invention is shown when the bending radius is 15 cm. DETAILED DESCRIPTION

[0028] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0029] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0030] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0031] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0032] In the embodiments of the present invention, the collection, updating, analysis, processing, use, transmission, provision, disclosure, storage and other aspects of the data involved (for example, including but not limited to user personal information) are in compliance with the provisions of relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. In particular, necessary measures are taken for user personal information to prevent illegal access to user personal information data and maintain the security of user personal information and network security.

[0033] In the embodiment of the present invention, before obtaining or collecting the user's personal information, the user's authorization or consent is obtained.

[0034] In the relevant technology, the main causes of GIS failures are insulation defects, mechanical and gas leakage, among which insulation defects account for more than half of the failures. Insulation defects cause the original electric field to be distorted, resulting in local high field strength areas, so these defective areas are insulation weak points. When the electric field in a local area is higher than the breakdown field strength, discharge will occur in that area while other areas still maintain insulation characteristics, which is partial discharge (PD).

[0035] At present, the ultra-high-frequency (UHF) method is commonly used for online detection of partial discharge. The frequency range of the UHF method is 0.3~3GHz. Since the on-site environmental noise is mostly less than 0.3GHz, this method has the advantages of high sensitivity and strong anti-interference ability, and has therefore attracted the attention of researchers at home and abroad.

[0036] In the UHF partial discharge detection system, the UHF sensor is the core component, and its excellent performance is the basic guarantee for the successful detection of partial discharge signals. Therefore, the UHF sensor with superior design performance can lay the foundation for the smooth implementation of partial discharge live detection or online detection. The UHF sensors used for partial discharge detection are divided into built-in and external types. Since the external UHF sensors will not affect the operation of GIS during online detection, flexible detection can be achieved, so they have sufficient practical application value. However, GIS is becoming more and more miniaturized, and the distance between the components of the equipment is decreasing. When partial discharge occurs, it is necessary to check the components of each part. At this time, some compact spaces (such as cable terminals, etc.) are difficult to install, resulting in the inability to effectively detect partial discharge.

[0037] In view of this, an embodiment of the present invention provides a flexible ultra-high frequency sensor for partial discharge detection, including a flexible substrate, a radiation zone, a grounding zone and a feeder zone; wherein the radiation zone includes a main radiation zone and multiple auxiliary radiation zones, the main radiation zone is a rectangle, and the multiple auxiliary radiation zones are distributed on the periphery of the main radiation zone, the auxiliary radiation zone is in the shape of an isosceles right triangle, the main radiation zone and the auxiliary radiation zone are an integrated structure, and the hypotenuse of the auxiliary radiation zone is connected to the main radiation zone.

[0038] Figure 1 A block diagram of a flexible UHF sensor for partial discharge detection according to an embodiment of the present invention is shown.

[0039] like Figure 1 As shown, the flexible UHF sensor 100 for partial discharge detection includes a flexible substrate 110 , a radiation area 120 , a grounding area 130 and a feeder area 140 .

[0040] Among them, the radiation zone 120 includes a main radiation zone 121 and multiple auxiliary radiation zones 122. The main radiation zone 121 is a rectangle. The multiple auxiliary radiation zones 122 are distributed on the periphery of the main radiation zone 121. The shape of the auxiliary radiation zone 122 is an isosceles right triangle. The main radiation zone 121 and the auxiliary radiation zone 122 are an integrated structure. The hypotenuse of the auxiliary radiation zone 122 is connected to the main radiation zone 121.

[0041] According to an embodiment of the present invention, a serrated protrusion is provided on the periphery of the radiation zone so that the periphery presents a periodic self-similar structure, thereby extending the circumference of the periphery of the radiation zone and providing a longer flow path for the surface current, thereby saving the area of ​​the flexible substrate, further reducing the volume of the flexible UHF sensor, and improving the low-frequency performance of the flexible UHF sensor. The use of a flexible substrate also increases the flexibility of use of the flexible UHF sensor, so that the flexible UHF sensor can be more flexibly used in a compact space.

[0042] Figure 2A front structural diagram of a flexible ultra-high frequency sensor for partial discharge detection according to an embodiment of the present invention is shown.

[0043] like Figure 2 As shown, the flexible ultra-high frequency sensor for partial discharge detection includes a flexible substrate 210, a radiation area 220, a grounding area 230 and a feeder area 240. The radiation area 220, the grounding area 230 and the feeder area 240 are located on the same surface of the flexible substrate 210. The radiation area 220 includes a main radiation area 221 and a plurality of auxiliary radiation areas 222. The two corners of the main radiation area 221 close to the feeder area 240 are rounded corners, and a groove area is provided on one side of the main radiation area 221 close to the feeder area 240. The radiation area 220 includes a plurality of feeding points, which are arranged at the edge of the groove area. The radiation area 220 and the feeder area 240 are an integrated structure. A rectangular hollow area is provided inside the main radiation area 221. The feeder area 240 includes a plurality of straight segments and a plurality of bending segments, so that the feeder area 240 is a multi-branched zigzag structure for feeding. The number of the plurality of auxiliary radiation areas 222 can be as shown in the figure, with two auxiliary radiation areas being arranged on each side, or it can be other arrangements, for example, three. It should be noted that Figure 2 The sizes of the UHF sensors in the figures are for schematic illustration only and do not constitute any limitation on the size of the flexible UHF sensor of the present invention.

[0044] According to an embodiment of the present invention, the corners below the radiation zone are rounded to make the flow of the current on the surface of the radiation zone smoother, which can improve the impedance continuity of the flexible UHF sensor and avoid the deterioration of the directional diagram caused by the edges and corners. A groove is set below the radiation zone, which can also extend the outer perimeter of the radiation zone, and at the same time reserve a certain space for the feeder, reduce the area of ​​the flexible substrate in the flexible UHF sensor, thereby reducing the volume of the flexible UHF sensor, and facilitate the discharge detection of the flexible UHF sensor in a small space. The middle of the radiation zone is hollowed out, which has the effect of adjusting the impedance of the flexible UHF sensor and improving the surface current path, so that it can better match the coaxial line. The multi-point feeding structure increases the uniformity of the surface current distribution, and also improves the stability of the input impedance, which plays a role in increasing the working bandwidth of the flexible UHF sensor. At the same time, in order to combine the multi-feed point structure, the feeder is appropriately extended by tortuosity, and the feeder size is effectively extended when the flexible substrate area of ​​the flexible UHF sensor is constant, that is, the electrical size of the flexible UHF sensor is equivalently increased, and the bandwidth of the flexible UHF sensor is widened.

[0045] Figure 3A A front structural diagram of a flexible UHF sensor for partial discharge detection according to yet another embodiment of the present invention is shown.

[0046] Figure 3B It is shown that according to the present invention Figure 3AA side structural diagram of a flexible UHF sensor for partial discharge detection shown in an embodiment.

[0047] like Figure 3A and Figure 3B As shown, the flexible UHF sensor for partial discharge detection includes a flexible substrate 310, a radiation zone 320, a grounding zone 330 and a feeder zone 340. The radiation zone 320 includes a main radiation zone 321 and a plurality of auxiliary radiation zones 322. The two corners of the main radiation zone 321 close to the feeder zone 340 are rounded. The grounding zone 330 and the feeder zone 340 are located on one side of the flexible substrate 310, and the radiation zone 320 is located on the other side of the flexible substrate 310. The radiation zone 320 and the feeder zone 340 are coupled. A rectangular hollow area is provided inside the main radiation zone 321. The feeder zone 340 includes a plurality of straight segments and a plurality of bending segments, so that the feeder zone 340 is a multi-branched zigzag structure for feeding. It should be noted that Figure 3A and Figure 3B The sizes of the flexible UHF sensor are for schematic illustration only and do not constitute a limitation on the size of the flexible UHF sensor of the present invention.

[0048] like Figure 3A and Figure 3B As shown, the flexible substrate 310 includes a first flexible area A1, a second flexible area A2 and a flexible connection area A3, the first flexible area A1 and the second flexible area A2 are connected by the flexible connection area A3, and the first flexible area A1, the second flexible area A2 and the flexible connection area A3 make the flexible substrate U-shaped. The first flexible area A1 and the flexible connection area A3 can be at an angle of 90°, the second flexible area A2 and the flexible connection area A3 can be at an angle of 90°, and the first flexible area A1 and the second flexible area A2 can be parallel. The angle between the first flexible area A1, the flexible connection area A2 and the second flexible area A3 can also be set to other angles as needed.

[0049] The radiation area and the feeder area are located in the first flexible area A1, and the grounding area is located in the first flexible area A1, the flexible connection area A2, and the second flexible area A3. Figure 3B The first flexible region A1, the flexible connection region A2 and the second flexible region A3 are separate structures. In actual applications, the first flexible region A1, the flexible connection region A2 and the second flexible region A3 are an integrated structure, and the corners can be rounded at the bending parts.

[0050] According to an embodiment of the present invention, since the main receiving direction of the flexible UHF sensor is the normal direction of the surface where the radiation surface is located, electromagnetic shielding is mainly performed on the electromagnetic waves propagating from the back side of the flexible UHF sensor, that is, the side where the second flexible area A3 is located. On the one hand, due to the particularity of the installation position on the left and right sides, there are fewer electromagnetic waves in this direction. At the same time, the bending characteristics of the flexible UHF sensor also need to be considered. Therefore, the present invention does not perform shielding structure processing on the left and right sides of the flexible UHF sensor. The metal in the grounding area on the back can shield most of the external electromagnetic interference. At the same time, because it is connected to the ground, it can quickly introduce electrons into the earth, so that the flexible UHF sensor has good electromagnetic shielding performance. Compared with the sensors in the related art, the flexible UHF sensor of the present invention has the advantage of on-site detection.

[0051] According to an embodiment of the present invention, since the radiation zone and the feeder zone are not on the same surface, the radiation zone and the feeder zone are fed by coupling, and the radiation zone and the feeder zone can form overlapping structures on different surfaces. Combined with the multi-feed point structure, the feeder zone size is effectively extended under the condition of a certain area of ​​the flexible substrate, that is, the electrical size of the flexible UHF sensor is equivalently increased, and the bandwidth of the flexible UHF sensor is widened. The feeder zone and the grounding zone can be connected through an SMA connector. In order to be suitable for on-site detection, the grounding zone can also be extended to the second flexible area of ​​the flexible substrate, and the electromagnetic shielding effect is achieved for the electromagnetic waves propagated from the second flexible area. The middle part of the radiation zone is hollowed out, which has the effect of adjusting the impedance of the flexible UHF sensor and improving the surface current path, so that it can better match the 50Ω coaxial line; the multi-point feeding structure increases the uniformity of the surface current distribution, and also improves the stability of the input impedance, which plays a role in increasing the working bandwidth of the flexible UHF sensor.

[0052] Figure 4A A front structural diagram of a flexible UHF sensor for partial discharge detection according to yet another embodiment of the present invention is shown.

[0053] Figure 4B A front structural diagram of a flexible UHF sensor for partial discharge detection according to yet another embodiment of the present invention is shown.

[0054] like Figure 4A and Figure 4B As shown, the radiation zone may include two, and the adjacent edges of the two radiation zones are complementary structures. The serrated edges of the two parts are complementary structures, and can be coupled with each other to increase the coupling effect of the radiation zone as a whole. Figure 4A It can be in Figure 2 The flexible UHF sensor in the embodiment shown is improved based on the Figure 4B It can be in Figure 3A and 3BThe flexible UHF sensor in the embodiment shown is improved based on Figure 4A and Figure 4B The flexible UHF sensor shown in the figure is similar to the flexible UHF sensor shown in the previous text. The relevant part identification can refer to the previous identification and will not be displayed or repeated here.

[0055] According to an embodiment of the present invention, the material of the flexible substrate may be polyimide, and the materials of the radiation area, the grounding area and the feeder area may all be copper.

[0056] The present invention also provides an application of the flexible UHF sensor as described above in partial discharge detection.

[0057] by Figure 4B The flexible UHF sensor shown in FIG. 1 is used as a basis to provide a size example of a flexible UHF sensor, wherein the flexible substrate is bent into a shape as shown in FIG. Figure 3B The three-dimensional dimensions are 85×75×20mm, and the thickness of the radiation area, grounding area and feeder area is 0.035mm.

[0058] The main radiation area of ​​the two radiation areas is a rectangle of 30×55mm, the auxiliary radiation area is an isosceles right triangle with a right angle of 11.3mm, the middle is hollowed out to be a rectangle of 20×9mm, the radius of curvature of the fillet below the radiation area is 4mm, and a groove can also be set below the radiation area, the groove size is 23×3.5mm, which can also extend the outer perimeter of the radiation area. The grounding area is in the same plane as the feeder area and is not on the same plane as the radiation area. The received signal is transmitted through the feeder area in the form of coupling. In order to increase the coupling effect, there is an overlap area of ​​10mm between the feeder area and the radiation area. The feeder area adopts a multi-branch zigzag structure for feeding, in which the feeder width is 1.4mm, and the radiation area adopts a coupled multi-point feeding form, and the distance between the two feeding points is 17mm.

[0059] by Figure 1 The flexible UHF sensor shown in the figure is used as the basis for testing, where the dimensions are as follows: the dimensions of the flexible substrate are 83.5×70×0.2mm, the thickness of the radiation area, grounding area, and feeder area are all 0.035mm, the dimensions of the main radiation area are 55×60mm, the auxiliary radiation area is an isosceles right triangle of 9.4mm, the hollow in the middle of the radiation area is a rectangle of 40×11mm, the dimensions of the groove below the radiation area are 37.4×4.7mm, and the width of the feeder area is 1.4mm. The test results are shown in Figure 5A to Figure 5C shown.

[0060] Figure 5A A voltage standing wave ratio curve of the flexible UHF sensor according to an embodiment of the present invention is shown in the non-bending state.

[0061] Figure 5B A voltage standing wave ratio curve of the flexible UHF sensor according to an embodiment of the present invention is shown when the bending radius is 25 cm.

[0062] Figure 5C A voltage standing wave ratio curve of the flexible UHF sensor according to an embodiment of the present invention is shown when the bending radius is 15 cm.

[0063] like Figure 5A As shown, a Voltage Standing Wave Ratio (VSWR) curve when the flexible UHF sensor is not bent, wherein the abscissa is the frequency and the ordinate is the VSWR.

[0064] VSWR indicates the ratio of the maximum value to the minimum value of the voltage standing wave graph generated along the transmission line when the flexible ultra-high frequency sensor is used as the load of the lossless transmission line. The minimum VSWR is 1. The smaller the value, the smaller the reflection and the better the matching effect. In engineering, the frequency band range with VSWR less than 2 is generally used as the bandwidth. Therefore, Figure 5A It can be obtained that the bandwidth simulated when the flexible UHF sensor is not bent is 0.65~2.05GHz.

[0065] like Figure 5B and Figure 5C As shown, the horizontal axis is frequency and the vertical axis is voltage standing wave ratio. It can be obtained that when the bending radius of the flexible UHF sensor is 25cm, the simulation bandwidth is 0.64~2GHz; when the bending radius of the flexible UHF sensor is 15cm, the simulation bandwidth is 0.62~2.03GHz. Therefore, the overall effect of bending on the VSWR of the flexible UHF sensor is small, so when it is attached to the GIS surface for actual partial discharge detection, it will not affect the performance of the flexible UHF sensor too much.

[0066] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. It can be understood by those skilled in the art that the features recorded in the various embodiments of the present invention can be combined and / or combined in various ways, even if such a combination or combination is not explicitly recorded in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features recorded in the various embodiments of the present invention can be combined and / or combined in various ways. All these combinations and / or combinations fall within the scope of the present invention.

[0067] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A flexible ultra-high frequency sensor for partial discharge detection, characterized in that: The flexible UHF sensor comprises a flexible substrate, a radiation area, a grounding area and a feeder area; Among them, the radiation zone includes a main radiation zone and multiple auxiliary radiation zones, the main radiation zone is a rectangle, and the multiple auxiliary radiation zones are distributed on the periphery of the main radiation zone. The shape of the auxiliary radiation zone is an isosceles right triangle, the main radiation zone and the auxiliary radiation zone are an integrated structure, the hypotenuse of the auxiliary radiation zone is connected to the main radiation zone, the two corners of the main radiation zone close to the feeder zone are rounded corners, and a groove zone is provided on the side of the main radiation zone close to the feeder zone.

2. The flexible UHF sensor according to claim 1, characterized in that: The radiation area includes a plurality of feed points, and the feed points are arranged at the edge of the groove area. The radiation area and the feed line area are an integrated structure.

3. The flexible UHF sensor according to claim 1, characterized in that: Two corners of the main radiation area close to the feeder area are rounded, the grounding area and the feeder area are located on one side of the flexible substrate, the radiation area is located on the other side of the flexible substrate, and the radiation area and the feeder area are coupled.

4. The flexible UHF sensor according to claim 3, characterized in that: The flexible substrate comprises a first flexible region, a second flexible region and a flexible connection region, the first flexible region and the second flexible region are connected through the flexible connection region, and the first flexible region, the second flexible region and the flexible connection region make the flexible substrate U-shaped; The radiation area and the feeder area are located in the first flexible area, and the grounding area is located in the first flexible area, the flexible connection area and the second flexible area.

5. The flexible UHF sensor according to any one of claims 1 to 3, characterized in that: The radiation zones include two, and adjacent sides of the two radiation zones are complementary structures.

6. The flexible UHF sensor according to any one of claims 1 to 3, characterized in that: The feeder area includes a plurality of straight segments and a plurality of bending segments.

7. The flexible UHF sensor according to any one of claims 1 to 3, characterized in that: A rectangular hollow area is arranged inside the main radiation area.

8. The flexible UHF sensor according to any one of claims 1 to 3, characterized in that: The flexible substrate is made of polyimide, and the radiation area, the grounding area and the feeder area are all made of copper.

9. Use of the flexible ultra-high frequency sensor according to any one of claims 1 to 8 in partial discharge detection.

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