External transformer partial discharge ultrahigh frequency sensor and installation method

Abstract

The invention discloses an external transformer partial discharge ultrahigh frequency sensor and an installation method, and belongs to the technical field of antennae, and the method comprises the steps: enabling one surface, provided with a radiation patch, of the external transformer partial discharge ultrahigh frequency sensor to face a grounding copper bar of a transformer, and not to be in direct contact with the grounding copper bar; the external transformer partial discharge ultrahigh frequency sensor comprises a dielectric substrate and a radiation patch. The radiation patch is mounted on the first surface of the dielectric substrate; the radiation patch is of a rectangular array window structure. According to the invention, the sensor is installed near the grounding copper bar outside the transformer, so that the problem that the sensor is installed inside the transformer in the prior art can be solved. The internal structure of the transformer does not need to be transformed, and internal insulation of the transformer is not affected.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to an external transformer partial discharge ultra-high frequency sensor and its installation method. Background Technology

[0002] Current partial discharge detection technologies include electrical and non-electrical detection techniques. Electrical detection techniques mainly include pulse current method, high-frequency current method, and ultra-high frequency method. Due to its higher detection frequency and stronger anti-interference ability, the ultra-high frequency method has been widely used.

[0003] Existing ultra-high frequency (UHF) sensors are mainly installed inside transformers for detection, such as oil valve-type UHF sensors, or by creating a medium window in the transformer tank wall and installing the UHF sensor inside the medium window. This method of installing sensors inside the transformer can affect the internal insulation of the transformer, posing a potential insulation hazard. Furthermore, built-in UHF sensors cannot be directly applied to transformers operating in substations. Summary of the Invention

[0004] This invention provides an external transformer partial discharge ultra-high frequency sensor and its installation method, which can solve the problem of installing the sensor inside the transformer in the prior art.

[0005] An embodiment of the present invention provides an installation method for an external transformer partial discharge ultra-high frequency sensor, comprising: The external transformer partial discharge UHF sensor with the radiation patch installed faces the transformer's grounding copper busbar and does not directly contact the grounding copper busbar. The external transformer partial discharge ultra-high frequency sensor includes: a dielectric substrate and a radiating patch; The radiating patch is mounted on the first side of the dielectric substrate; The radiating patch has a rectangular array window structure.

[0006] Another embodiment of the present invention provides an external transformer partial discharge ultra-high frequency sensor, comprising: a dielectric substrate and a radiating patch; The radiating patch is mounted on the first side of the dielectric substrate; The radiating patch has a rectangular array window structure.

[0007] Furthermore, the external transformer partial discharge ultra-high frequency sensor also includes: a microstrip transmission line and a coaxial connector; The coaxial connector is welded to the edge of the dielectric substrate; The radiating patch is connected to the coaxial connector via the microstrip transmission line.

[0008] Furthermore, the dielectric substrate has a rectangular structure; A ground plane is provided on the second surface of the dielectric substrate.

[0009] Furthermore, the dielectric substrate is made of FR4 material; the dielectric constant of the dielectric substrate is 4.4.

[0010] Furthermore, the radiating patch is provided with several rectangular windows; The rectangular array window structure of the radiating patch is a 1-row × N-column structure; where N is the number of rectangular windows.

[0011] Furthermore, the coaxial connector is a BNC interface.

[0012] Furthermore, the detection frequency band of the radiation patch is 0.7-1.5 GHz.

[0013] Furthermore, the width of the dielectric substrate is equal to the width of the grounding copper busbar.

[0014] Furthermore, antenna lugs are designed on both sides of the radiating patch.

[0015] The following benefits can be obtained by implementing the present invention: This invention relates to an external transformer partial discharge UHF sensor, with the side of the sensor containing the radiating patch facing the transformer's grounding copper busbar but not in direct contact with it. The external transformer partial discharge UHF sensor includes a dielectric substrate and a radiating patch; the radiating patch is mounted on a first side of the dielectric substrate; the radiating patch has a rectangular array window structure. This invention installs the sensor near the grounding copper busbar outside the transformer, without requiring modification to the transformer's internal structure and without affecting the transformer's internal insulation. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating the installation position of an external transformer partial discharge ultra-high frequency sensor according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an external transformer partial discharge ultra-high frequency sensor provided in an embodiment of the present invention; The reference numerals in the accompanying drawings are as follows: dielectric substrate 1, radiating patch 2, microstrip transmission line and coaxial connector 4. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] See Figure 1 This is a flowchart illustrating the installation position of an external transformer partial discharge ultra-high frequency sensor according to an embodiment of the present invention. To address the problem of installing sensors inside the transformer in the prior art, an embodiment of the present invention provides an installation method for an external transformer partial discharge ultra-high frequency sensor, comprising: The external transformer partial discharge ultra-high frequency sensor with the radiation patch 2 is mounted facing the grounding copper busbar of the transformer and is not in direct contact with the grounding copper busbar. The external transformer partial discharge ultra-high frequency sensor includes: a dielectric substrate 1 and a radiating patch 2; The radiation patch 2 is mounted on the first side of the dielectric substrate 1; The radiating patch 2 has a rectangular array window structure.

[0023] In this embodiment, the sensor is located outside the transformer. The transformer's grounding copper busbar is an external component. The side of the sensor with the radiating patch 2 is positioned facing the grounding copper busbar, maintaining a certain distance between the radiating patch 2 and the grounding copper busbar, without direct contact. Due to the partial discharge current flowing through the grounding copper wire in the ultra-high frequency band, an electromagnetic field is generated in the surrounding area. The radiating patch 2 generates a partial discharge signal through inductive electromagnetic field coupling.

[0024] It should be noted that the radiating patch 2 is designed as a rectangular array window structure, meaning that the radiating patch 2 is actually a window-shaped structure, and the window openings of this window-shaped structure are several rectangles arranged in an array. The rectangular array window structure of the radiating patch 2 is more effective than the ring-shaped radiating patch 2.

[0025] The width of the radiating patch 2 does not exceed the width of the dielectric substrate 1.

[0026] like Figure 2 As shown, based on the above-described method embodiments, an embodiment of the present invention provides an X-type external transformer partial discharge ultra-high frequency sensor, comprising: a dielectric substrate 1 and a radiating patch 2; The radiation patch 2 is mounted on the first side of the dielectric substrate 1; The radiating patch 2 has a rectangular array window structure.

[0027] In a preferred embodiment, the external transformer partial discharge ultra-high frequency sensor further includes: a microstrip transmission line 3 and a coaxial connector 4; The coaxial connector 4 is welded to the edge of the dielectric substrate 1; The radiating patch 2 and the coaxial connector 4 are connected via the microstrip transmission line 3.

[0028] In this embodiment, the partial discharge signal is transmitted through the microstrip transmission line 3 and output through the coaxial connector 4, which can be displayed on an oscilloscope or other device. The microstrip transmission line 3 is used to achieve impedance matching between the radiating patch 2 and the coaxial connector 4.

[0029] In a preferred embodiment, the dielectric substrate 1 has a rectangular structure; The second surface of the dielectric substrate 1 is provided with a ground plane.

[0030] In a preferred embodiment, the dielectric substrate 1 is made of FR4 material; the dielectric constant of the dielectric substrate 1 is 4.4.

[0031] In a preferred embodiment, the radiating patch 2 is provided with a plurality of rectangular windows; The rectangular array window structure of the radiation patch 2 is a 1-row × N-column structure; where N is the number of rectangular windows.

[0032] In a preferred embodiment, the coaxial connector 4 is a BNC interface.

[0033] In a preferred embodiment, the detection frequency band of the radiation patch 2 is 0.7-1.5 GHz.

[0034] In a preferred embodiment, the width of the dielectric substrate 1 is equal to the width of the grounding copper busbar.

[0035] It should be noted that setting the dielectric substrate 1 to be the same width as the grounding copper busbar is for the convenience of sensor installation. During installation, simply align the sensor's dielectric substrate 1 with the grounding copper busbar to ensure they are the same width.

[0036] In a preferred embodiment, antenna ears are designed on both sides of the radiating patch 2.

[0037] It should be noted that the antenna lugs are used to improve the impedance matching effect of the radiating sheet metal. Thickening the antenna makes the antenna impedance lower, effectively matching a specific ohmic impedance over a wider frequency band.

[0038] It should be noted that existing built-in UHF sensors require installation inside the transformer, which is costly and poses certain safety risks. This invention installs the sensor near the grounding copper busbar outside the transformer, requiring no modification to the transformer's internal structure and having no impact on the transformer's internal insulation. Furthermore, detection at the grounding copper busbar is far from the transformer's high-voltage end, thus minimizing risk.

[0039] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for installing an external transformer partial discharge ultra-high frequency sensor, characterized in that, include: The external transformer partial discharge UHF sensor with the radiation patch installed faces the transformer's grounding copper busbar and does not directly contact the grounding copper busbar. The external transformer partial discharge ultra-high frequency sensor includes: a dielectric substrate and a radiating patch; The radiating patch is mounted on the first side of the dielectric substrate; The radiating patch has a rectangular array window structure.

2. An external transformer partial discharge ultra-high frequency sensor, characterized in that, include: Dielectric substrate and radiating patch; The radiating patch is mounted on the first side of the dielectric substrate; The radiating patch has a rectangular array window structure.

3. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, Also includes: Microstrip transmission lines and coaxial connectors; The coaxial connector is welded to the edge of the dielectric substrate; The radiating patch is connected to the coaxial connector via the microstrip transmission line.

4. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The dielectric substrate has a rectangular structure; The second side of the dielectric substrate is provided with a ground plane.

5. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The dielectric substrate is made of FR4 material; the dielectric constant of the dielectric substrate is 4.

4.

6. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The radiating patch is provided with several rectangular windows; The rectangular array window structure of the radiating patch is a 1-row × N-column structure; where N is the number of rectangular windows.

7. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The coaxial connector is a BNC interface.

8. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The detection frequency band of the radiation patch is 0.7-1.5 GHz.

9. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The width of the dielectric substrate is equal to the width of the grounding copper busbar.

10. The external transformer partial discharge ultra-high frequency sensor as described in claim 2, characterized in that, The radiating patch is designed with antenna lugs on both sides.

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