Omnidirectional antenna for oil-immersed transformer temperature oil level information collection

Abstract

The application provides an omnidirectional antenna for oil-immersed transformer temperature oil level information collection, which comprises a base, a radio frequency coaxial connecting line, an antenna shell and an omnidirectional antenna, an installation space is formed in the antenna shell, the base is connected with the bottom of the antenna shell, the omnidirectional antenna is arranged in the installation space, one end of the radio frequency coaxial connecting line is connected with the omnidirectional antenna, the other end of the radio frequency coaxial connecting line sequentially passes through the bottom of the antenna shell and / or the base and extends to the outside of the installation space and is connected with a data reading device. The base is fastened and installed on the arrangement characteristics of the oil-immersed transformer temperature oil level sensor, the antenna floor and the antenna radiation sheet are arranged, which helps to realize the transmission and reception of the electromagnetic wave signals of the reading and collecting device with sufficient power, and the structure is simple and convenient to install.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of information collection antenna design, in particular, to a kind of omnidirectional antenna for oil-immersed transformer temperature oil level information collection. BACKGROUND

[0002] The existing reading antenna for information collection in the market is generally a flat reading directional antenna, which is fixed by a pole, and has problems such as large size and inconvenient installation. The problem is particularly prominent in the field of wireless collection of oil-immersed transformer temperature oil level information.

[0003] The existing Chinese patent with publication number CN102323524A discloses a signal collection device for transformer partial discharge online monitoring device; its features are: containing a sealed insulating part, an antenna and a support device, the sealed insulating part is fixedly connected with the support device, an inner cavity is arranged in the sealed insulating part, the antenna is arranged in the inner cavity of the sealed insulating part, the wire of the antenna is arranged to pass through the support device, the outer end of the wire of the antenna is arranged to protrude from the outer end surface of the cavity of the support device, the sealed insulating part is arranged inside the transformer, and the support device is fixedly and sealingly connected with the shell of the transformer. The included angle α between the horizontal center line of the antenna and the horizontal center line of the support device is 0-15°.

[0004] The inventor believes that the signal collection device in the prior art has a complex structure and is inconvenient to install the antenna, which needs to be improved. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide an omnidirectional antenna for oil-immersed transformer temperature oil level information collection.

[0006] According to the omnidirectional antenna for oil-immersed transformer temperature oil level information collection provided by the present application, the omnidirectional antenna includes a base, a radio frequency coaxial connecting line, an antenna shell and an omnidirectional antenna, an installation space is formed in the antenna shell, the base is connected with the bottom of the antenna shell, the omnidirectional antenna is arranged in the installation space, one end of the radio frequency coaxial connecting line is connected with the omnidirectional antenna, the other end of the radio frequency coaxial connecting line passes through the bottom of the antenna shell and / or the base in sequence and extends to the outside of the installation space to be connected with a data reading device.

[0007] Preferably, the feed mode of the omnidirectional antenna includes coaxial feed.

[0008] Preferably, the omnidirectional antenna and the radio frequency coaxial connecting line are riveted.

[0009] Preferably, the end of the radio frequency coaxial connecting line extending to the outside of the installation space includes an SMA type joint or an N type joint, and the radio frequency coaxial connecting line is connected with the data reading device through the SMA type joint or the N type joint.

[0010] Preferably, the omnidirectional antenna includes an antenna ground plane and an antenna radiating plate, both of which have an arc shape; both the antenna ground plane and the antenna radiating plate are fixedly connected to the bottom of the antenna housing, and both the antenna ground plane and the antenna radiating plate are spaced apart from the side wall of the antenna housing.

[0011] Preferably, the bottom of the antenna housing is provided with a radial ridge, and the radial ridge is provided with an installation gap, and the antenna radiating plate is inserted into the installation gap.

[0012] Preferably, the gap between the antenna floor and the antenna radiating plate and the side wall of the antenna housing is 2-3 mm.

[0013] Preferably, the base comprises a magnetic material.

[0014] Preferably, the magnetic material includes a magnet, and the base also includes a stainless steel component, with the magnet embedded within the stainless steel component.

[0015] Preferably, the antenna housing is made of a non-metallic material with wave transmission properties, and the dielectric constant of the antenna housing material is in the range of 3.5-5.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention utilizes the arrangement of an omnidirectional antenna installed inside an antenna housing and secured to an oil-immersed transformer temperature and oil level sensor via a base. The arrangement of the antenna floor and antenna radiating plate helps to transmit and receive electromagnetic wave signals from the reading and acquisition device with sufficient power. Furthermore, the structure is simple and easy to install.

[0018] 2. By using fiberglass material for the antenna housing, this invention helps to improve its service life outdoors. The base with magnets is directly attached to the transformer cover plate, which helps to improve the convenience of installation.

[0019] 3. The present invention improves the ease of installation of the antenna floor and antenna radiating plate by creating an installation gap on the radial ridge at the bottom of the antenna housing and fastening the antenna floor and antenna radiating plate to the bottom of the antenna housing by inserting them into the installation gap. Attached Figure Description

[0020] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram illustrating the overall structure of the omnidirectional antenna, which is the main feature of this invention.

[0022] Figure 2 This is a schematic diagram illustrating the working principle of an omnidirectional antenna, which is the main feature of this invention.

[0023] Figure 3 This is a schematic diagram illustrating the installation of an omnidirectional antenna on a transformer, which is the main feature of this invention.

[0024] As shown in the figure:

[0025] Base 1 Antenna Ground 4

[0026] RF coaxial cable 2, antenna radiating plate 5

[0027] Antenna housing 3 Detailed Implementation

[0028] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0029] like Figure 1 As shown, an omnidirectional antenna for collecting temperature and oil level information of an oil-immersed transformer according to the present invention includes a base 1, a radio frequency coaxial connecting line 2, an antenna housing 3, and an omnidirectional antenna. An installation space is formed inside the antenna housing 3, and the omnidirectional antenna is disposed within the installation space. The base 1 is connected to the bottom of the antenna housing 3.

[0030] One end of the RF coaxial cable 2 is connected to the omnidirectional antenna, and the other end of the RF coaxial cable 2 passes through the bottom of the antenna housing 3 and the base 1 in sequence, and extends to the outside of the installation space to connect with the data reading device.

[0031] Specifically, the antenna housing 3 comprises a non-metallic material with wave transmission properties, and the dielectric constant of the antenna housing 3 material ranges from 3.5 to 5. In this application, the antenna housing 3 is preferably made of fiberglass, and its shape is cylindrical, which has anti-aging properties and is aesthetically pleasing.

[0032] The base 1 comprises a magnetic material and a stainless steel component. In this application, the magnetic material is preferably a magnet, which is embedded in the stainless steel component. The base 1 has an overall cylindrical shape and is coaxially mounted on the bottom of the antenna housing 3. The base 1 fits tightly with the bottom of the antenna housing 3 and has a certain degree of waterproof performance.

[0033] Furthermore, the base 1 is used to provide stable support for the overall omnidirectional structure and can be firmly fixed to the cover plate of the oil-immersed transformer.

[0034] The omnidirectional antenna includes an antenna ground plate 4 and an antenna radiating plate 5. The omnidirectional antenna is a metal antenna. Both the antenna ground plate 4 and the antenna radiating plate 5 have an arc shape, and the antenna ground plate 4 and the antenna radiating plate 5 are arranged correspondingly in the installation space.

[0035] The antenna ground plane 4 has an arc of 225 degrees, a radius of 35 mm, a width of 50 mm, and a thickness of 1 mm. In actual use, due to processing and assembly errors, the dimensional parameters of the antenna ground plane 4 may deviate within a range that does not affect its function. Furthermore, a slot is formed in the middle of the antenna ground plane 4, thereby increasing the length of the current path on the metal surface of the antenna ground plane 4.

[0036] The antenna radiating piece 5 has an arc of 180 degrees, a radius of 50 mm, a width of 65 mm, and a thickness of 1 mm. In actual use, due to processing and assembly errors, the dimensional parameters of the antenna radiating piece 5 may deviate within a range that does not affect its function.

[0037] Both the antenna ground plate 4 and the antenna radiating plate 5 are fixedly connected to the bottom of the antenna housing 3. To achieve this fixed connection, radial ridges are formed on the bottom of the antenna housing 3. These radial ridges correspond to the antenna ground plate 4 and the antenna radiating plate 5. A 1mm wide mounting slot is provided on each radial ridge. The antenna ground plate 4 and the antenna radiating plate 5 are respectively inserted into the mounting slots on their corresponding radial ridges, thus achieving a secure installation of the omnidirectional antenna within the installation space.

[0038] Furthermore, both the antenna ground plate 4 and the antenna radiating plate 5 are spaced apart from the side wall of the antenna housing 3, and the gap between the antenna ground plate 4 and the antenna radiating plate 5 and the side wall of the antenna housing 3 is 2-3mm.

[0039] The omnidirectional antenna has a PIFA (Piston-Induced Atomizer) structure. It can be used to collect electromagnetic signals emitted by wireless sensors mounted on transformer covers. This scenario is characterized by short reading distances, a large number of sensors, constant sensor operating frequencies, and relatively fixed sensor mounting positions. Improvements to the omnidirectional antenna's structural shape can meet the omnidirectional reading requirements in this context.

[0040] The omnidirectional antenna is fed via coaxial feeding. In this application, the RF coaxial cable 2 adopts RG316 or higher specification. Specifically, the omnidirectional antenna is fed through the RF coaxial cable 2. One end of the RF coaxial cable 2 is riveted to both the antenna ground plate 4 and the antenna radiating plate 5. This riveting connection method has advantages such as simple operation, low cost, and stable reliability.

[0041] The other end of the RF coaxial cable 2 passes coaxially through the through-holes on the bottom of the antenna housing 3 and the base 1, extending to the outside of the mounting space. The end of the RF coaxial cable 2 extending to the outside of the mounting space includes an SMA connector or an N-type connector. The RF coaxial cable 2 connects to the data reading device via the SMA connector or N-type connector, transmitting the query signal from the data acquisition unit as an electromagnetic wave signal and receiving the returned data signal from the outside world, which is then transmitted to the data acquisition unit for analysis.

[0042] Working principle

[0043] The omnidirectional antenna is firmly fixed to the cover plate of the oil-immersed transformer by the base 1. The omnidirectional antenna can be reasonably placed according to the arrangement characteristics of the temperature and oil level sensors of the oil-immersed transformer. It can transmit and receive electromagnetic wave signals of the reading and acquisition equipment with sufficient power. The omnidirectional antenna has excellent performance, is easy to process, has a small size, a square and simple overall appearance, and is easy to install.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0045] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An omnidirectional antenna for oil-immersed transformer temperature oil level information collection, characterized in that, The application relates to a radio frequency coaxial connector, which comprises a base (1), a radio frequency coaxial connecting line (2), an antenna shell (3) and an omnidirectional antenna, the antenna shell (3) is internally formed with a mounting space, the base (1) is connected with the bottom of the antenna shell (3); the omnidirectional antenna is arranged in the mounting space, one end of the radio frequency coaxial connecting line (2) is connected with the omnidirectional antenna, the other end of the radio frequency coaxial connecting line (2) sequentially penetrates through the bottom of the antenna shell (3) and / or the base (1) and extends to the outside of the mounting space and is connected with a data reading device; the omnidirectional antenna comprises an antenna floor (4) and an antenna radiation sheet (5), the shapes of the antenna floor (4) and the antenna radiation sheet (5) both comprise an arc shape; the antenna floor (4) and the antenna radiation sheet (5) are both fixedly connected with the bottom of the antenna shell (3), and the antenna floor (4) and the antenna radiation sheet (5) are both arranged in a spaced mode with the side wall of the antenna shell (3); the base (1) comprises a magnetic material.

2. The omnidirectional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The feeding mode of the omnidirectional antenna comprises coaxial feeding.

3. The omnidirectional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The end of the radio frequency coaxial connecting line (2) extending to the outside of the mounting space comprises an SMA type joint or an N type joint, the radio frequency coaxial connecting line (2) is connected with the data reading device through the SMA type joint or the N type joint.

4. The omnidirectional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The bottom of the antenna shell (3) is provided with a radial rib, the radial rib is provided with a mounting gap, and the antenna radiation sheet (5) is inserted and matched with the mounting gap.

5. The omnidirectional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The gaps between the antenna floor (4) and the antenna radiation sheet (5) and the side wall of the antenna shell (3) are both 2-3 mm.

6. The omnidirectional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The radio frequency coaxial connecting line (2) is riveted with the antenna floor (4) and the antenna radiation sheet (5) respectively.

7. The omni-directional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The magnetic material comprises a magnet, the base (1) further comprises a stainless steel part, and the magnet is embedded in the stainless steel part.

8. The omnidirectional antenna for oil-immersed transformer temperature oil level information collection of claim 1, wherein, The antenna shell (3) comprises a non-metal material with wave transmission performance, and the dielectric constant of the material of the antenna shell (3) ranges from 3.5 to 5.

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