UHF Overvoltage Fusion Sensor for Gas Insulated Equipment and Its Measurement System

Abstract

A UHF overvoltage fusion sensor for gas insulated equipment is disclosed. In the UHF overvoltage fusion sensor for gas insulated equipment, the bottom plate includes a raised frustum portion. The frustum portion is provided with a concave recess portion and a through hole that penetrates the bottom plate downward along the bottom end of the recess portion. The interface is provided in the through hole. The interface has an intermediate layer. The voltage dividing insulation layer is adhesively bonded to the upper surface of the frustum portion via conductive adhesive. The impedance transition structure is connected to the recess portion via a threaded structure. The impedance transition structure is only connected to the intermediate layer by conductive silver paste. The voltage dividing arm is connected to the frustum portion via a threaded structure and surrounds the recess portion. The UHF dielectric layer is supported on the impedance transition structure. The UHF antenna plate is supported on the UHF dielectric layer. The UHF antenna plate and the UHF dielectric layer are connected to the recess portion via a threaded structure. The feeding rod passes through the UHF dielectric layer and is connected to the interface by conductive silver paste.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas insulated equipment detection, and particularly relates to a UHF overvoltage integrated sensor for gas insulated equipment and its measurement system. Background Art

[0002] Partial discharge is an early manifestation of insulation breakdown and flashover, and is an important means for detecting local defects and hidden dangers in gas insulated equipment during insulation tests and an important indicator for evaluating insulation reliability and life. Therefore, it is of great significance to apply sensors to power equipment for partial discharge detection. Due to its high sensitivity and strong anti-interference ability, the UHF detection technology has a wide application space in the partial discharge detection of gas insulated equipment. UHF detection mainly detects signals in the frequency band above 300 MHz generated by partial discharge, which can effectively avoid interference generated by other environmental factors such as corona, so it is an ideal partial discharge detection method.

[0003] In addition to the operating voltage during the operation of gas insulated equipment, it will also be subjected to transient overvoltages such as lightning, switching, and VFTO. Under the action of these transient overvoltages, the equipment will also generate partial discharge or even breakdown. Therefore, it is of great importance to detect the transient overvoltage borne by the equipment during operation. The monitoring of partial discharge and transient overvoltage is of great significance for the safe operation of power equipment.

[0004] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a UHF overvoltage integrated sensor for gas insulated equipment, which has a simple structure, is small and compact for easy installation, and has high measurement accuracy. To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A UHF overvoltage integrated sensor for gas insulated equipment of the present invention includes:

[0007] A bottom plate, which includes a raised frustum portion, the frustum portion is provided with a concave recess portion and a through hole penetrating the bottom plate downward along the bottom end of the recess portion,

[0008] An interface, which is arranged in the through hole, and the interface has an intermediate layer,

[0009] A voltage dividing insulating layer, which is bonded to the upper surface of the frustum portion via conductive adhesive,

[0010] An impedance transition structure, which is connected to the recess portion via a threaded structure, and the impedance transition structure is only connected to the intermediate layer by conductive silver paste,

[0011] A voltage dividing arm, which is connected to the frustum portion via a threaded structure and surrounds the recessed portion.

[0012] A very high frequency dielectric layer, which is supported by an impedance transition structure.

[0013] A very high frequency antenna board, which is supported by the very high frequency dielectric layer. The very high frequency antenna board is connected to the recessed portion via a threaded structure, and a feed rod passes through the very high frequency dielectric layer and is connected to the interface through conductive silver paste.

[0014] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the frustum portion is a centrosymmetric structure, and the central axis of the recessed portion, the central axis of the through hole and the central axis of the median line of the frustum portion are collinear.

[0015] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the recessed portion forms a conical recess.

[0016] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the impedance transition structure gradually thickens in the direction away from the intermediate layer.

[0017] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the very high frequency dielectric layer is a frustum cone structure.

[0018] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the voltage dividing arm is an annular structure.

[0019] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the voltage dividing arm and the bottom plate and the very high frequency antenna board jointly form the low-voltage arm capacitor in the capacitive voltage dividing structure in the overvoltage frequency band, and the gas-insulated equipment guide rod and the voltage dividing arm form the high-voltage arm capacitor in the capacitive voltage dividing structure.

[0020] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the very high frequency antenna board is a disc-shaped antenna structure, which is short-circuited to the bottom plate.

[0021] In the very high frequency overvoltage fusion sensor of the gas-insulated equipment described above, the impedance transition structure is a geometric structure with a smooth transition between the interface and the voltage dividing arm.

[0022] A measurement system of a gas-insulated equipment includes

[0023] A very high frequency overvoltage fusion sensor of a gas-insulated equipment, which is installed on the gas-insulated equipment to measure very high frequency signals and overvoltage signals.

[0024] A signal separation interface that connects to a UHF overvoltage fusion sensor to separate the UHF signal and the overvoltage signal,

[0025] A signal processor that connects to the signal separation interface to filter and amplify the UHF signal and the overvoltage signal,

[0026] An oscilloscope that connects to the signal processor.

[0027] In the above technical solution, a UHF overvoltage fusion sensor for a gas-insulated equipment provided by the present invention has the following beneficial effects: The UHF overvoltage fusion sensor for a gas-insulated equipment has high stability, is easy to manufacture, has strong anti-interference ability, high sensitivity, combines the characteristics of UHF and overvoltage sensors, can simultaneously monitor the partial discharge and overvoltage signals in the gas-insulated equipment and has high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of an embodiment of the UHF overvoltage fusion sensor for a gas-insulated equipment of the present invention;

[0030] Figure 2 It is a three-dimensional structural diagram of an embodiment of the UHF overvoltage fusion sensor for a gas-insulated equipment in the present invention;

[0031] Figure 3 It is a sectional view schematic diagram of an embodiment of the UHF overvoltage fusion sensor for a gas-insulated equipment in the present invention;

[0032] Figure 4 It is a schematic structural diagram of an embodiment of the measurement system for a gas-insulated equipment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the scope of protection of the present invention.

[0034] Therefore, the following description of the drawings Figures 1 to 4The detailed description of the embodiments of the present invention provided herein is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0037] In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0038] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, as Figures 1 to 3 shown,

[0041] the UHF overvoltage fusion sensor of the gas-insulated equipment includes

[0042] a bottom plate 2, which includes a raised frustum portion, and the frustum portion is provided with a concave recess and a through hole penetrating downward along the bottom end of the recess through the bottom plate 2,

[0043] an interface 1, which is provided in the through hole, and the interface 1 has an intermediate layer,

[0044] a voltage-dividing insulating layer 3, which is adhesively bonded to the upper surface of the frustum portion via a conductive adhesive,

[0045] an impedance transition structure 4, which is connected to the recess via a threaded structure, and the impedance transition structure 4 is only connected to the intermediate layer by a conductive silver paste,

[0046] a voltage-dividing arm 7, which is connected to the frustum portion via a threaded structure and surrounds the recess,

[0047] a UHF dielectric layer 6, which is supported on the impedance transition structure 4,

[0048] a UHF antenna board 8, which is supported on the UHF dielectric layer 6, and the UHF antenna board 8 is connected to the recess via a threaded structure, and a feeding rod 5 passes through the UHF dielectric layer 6 and is connected to the interface 1 by a conductive silver paste.

[0049] In a preferred embodiment of the UHF overvoltage fusion sensor of the gas-insulated equipment, the frustum portion is a centrally symmetric structure, and the central axis of the recess, the central axis of the through hole and the median axis of the frustum portion are collinear.

[0050] In a preferred embodiment of the UHF overvoltage fusion sensor of the gas-insulated equipment, the recess forms a conical recess.

[0051] In a preferred embodiment of the UHF overvoltage fusion sensor for a gas-insulated device, the impedance transition structure 4 gradually thickens in the direction away from the intermediate layer.

[0052] In a preferred embodiment of the UHF overvoltage fusion sensor for a gas-insulated device, the UHF dielectric layer 6 is a frustum of a cone structure.

[0053] In a preferred embodiment of the UHF overvoltage fusion sensor for a gas-insulated device, the voltage-dividing arm 7 is an annular structure.

[0054] In a preferred embodiment of the UHF overvoltage fusion sensor for a gas-insulated device, the voltage-dividing arm 7 and the bottom plate 2, the UHF antenna plate 8 together constitute the low-voltage arm capacitor in the capacitive voltage-dividing structure in the overvoltage frequency band, and the gas-insulated device rod and the voltage-dividing arm 7 constitute the high-voltage arm capacitor in the capacitive voltage-dividing structure.

[0055] In a preferred embodiment of the UHF overvoltage fusion sensor for a gas-insulated device, the UHF antenna plate 8 is a disc-shaped antenna structure, which is short-circuited to the bottom plate 2.

[0056] In a preferred embodiment of the UHF overvoltage fusion sensor for a gas-insulated device, the impedance transition structure 4 is a geometric structure with a smooth transition between the interface 1 and the voltage-dividing arm 7

[0057] In one embodiment, the outer diameter of the annular structure is the same as the outer diameter of the frustum part and their central axes are collinear.

[0058] In one embodiment, the UHF overvoltage fusion sensor is a centrally symmetric structure.

[0059] Further, the thickness of the impedance transition structure 4 linearly increases in the direction away from the intermediate layer.

[0060] In one embodiment, the basic structure of the gas-insulated device UHF-overvoltage fusion sensor from top to bottom is a UHF detection structure, which includes a UHF antenna plate 8, a UHF dielectric layer 6 and a feeding rod 5; an overvoltage detection structure, which includes a voltage-dividing arm 7, a voltage-dividing insulating layer 3 and a bottom plate 2; an impedance transition structure 4, an interface 1 and a lead wire.

[0061] In one embodiment, the voltage-dividing insulating layer 3 is closely bonded to the bottom plate 2 through a conductive adhesive; the voltage-dividing insulating layer 3 is closely bonded to the voltage-dividing arm 7 through a conductive adhesive; the voltage-dividing arm 7 is closely connected to the bottom plate 2 through an insulating bolt; the bottom plate 2 is connected to the interface 1 through a threaded structure; the impedance transition structure 4 is connected to the intermediate layer of the interface 1 through a conductive silver adhesive, and it is ensured that the connection is sufficient and uniform; the UHF antenna board 8 and the UHF dielectric layer 6 are connected to the bottom plate 2 through a threaded structure, and it is ensured that the connection between the UHF dielectric layer 6 and the UHF antenna board 8 is tight; the feeding rod 5 is closely connected to the UHF antenna board 8 through a threaded structure, and the feeding rod 5 is connected to the interface 1 through a conductive silver adhesive.

[0062] In one embodiment, the UHF antenna board 8 is a disc-shaped antenna structure. By short-circuit connecting with the bottom plate 2, the homogenization effect of the internal electric field of the gas-insulated equipment can be realized, thereby reducing the influence of the introduction of the integrated sensor on the equipment. The UHF dielectric layer 6 is a dielectric layer 6 with good insulation performance, which mainly undertakes the electrical characteristics of insulation and dielectric. The impedance transition structure 4 is a transition structure 4 connecting the joint and the voltage-dividing arm 7. Through the smooth transition of the geometric structure, the continuous transformation of the impedance is realized, and the reflection of the high-frequency signal during the propagation process in the sensor structure is reduced, thereby realizing the transmission of the signal. The voltage-dividing arm 7 and the bottom plate 2 and the UHF antenna board 8 together constitute the low-voltage arm capacitor in the capacitive voltage-dividing structure in the overvoltage frequency band, and its high-voltage arm capacitor is constituted by the guide rod of the gas-insulated equipment and the voltage-dividing arm 7.

[0063] In one embodiment, the selection of the thickness and radius of the voltage-dividing arm 7 should follow the following principles: the increase in the radius and thickness of the voltage-dividing arm 7 will respectively increase the capacitance between the voltage-dividing arm 7 and the UHF antenna, the bottom plate 2 and the equipment shell, thereby increasing the overvoltage measurement voltage-division ratio, and the increase in the capacitance between the UHF antenna and the voltage-dividing arm 7 will affect the performance of the UHF sensor. Therefore, on the premise of meeting the characteristics of the UHF sensor, the radius and thickness of the voltage-dividing arm 7 should be appropriately increased to increase the capacitance between the voltage-dividing arm 7 and the bottom plate 2 and the equipment shell, thereby reducing the induced voltage on the voltage-dividing arm 7.

[0064] Such as Figure 1As shown in the figure, first, apply a layer of conductive adhesive evenly and densely on the upper surface of the bottom plate 2 to fix the voltage-dividing insulating layer 3 and eliminate the gap between the bottom plate 2 and the voltage-dividing insulating layer 3 during installation; connect the voltage-dividing arm 7 and the impedance transition structure 4 to the bottom plate 2 with a threaded structure; connect the interface 1 to the bottom plate 2 with a threaded structure, and connect the interface 1 and the impedance transition structure 4 with conductive adhesive; connect the UHF antenna board 8 to the feeding rod 5; apply an appropriate amount of conductive adhesive at the bottom end of the feeding rod 5 above the interface 1; polish the upper and lower surfaces of the UHF dielectric plate smoothly, and fix the UHF antenna board 8 and the UHF dielectric layer 6 to the bottom plate 2 with a threaded structure, and adjust the height so that the feeding rod 5 is in good contact with the interface 1; evacuate and cure at high temperature to tightly connect the impedance transition structure and the feeding rod 5 with the interface 1. As Figure 2 shown, it omits structures such as the interface 1, the voltage-dividing insulating layer 3, the impedance transition structure 4, the feeding rod 5, and the UHF dielectric layer 6. As Figure 3 shown, it omits the interface 1 and the voltage-dividing insulating layer 3. To ensure that the implantation of the UHF-overvoltage fusion sensor of the insulating device does not affect the airtightness of the original device, sealing is performed between the UHF antenna board 8 and the dielectric layer 6, between the dielectric layer 6 and the impedance transition structure 4, and between the impedance transition structure 4 and the bottom plate 2.

[0065] A measurement system for a gas-insulated device includes

[0066] The described UHF-overvoltage fusion sensor for a gas-insulated device, which is installed on the gas-insulated device to measure UHF signals and overvoltage signals.

[0067] A signal separation interface 9, which is connected to the UHF-overvoltage fusion sensor to separate the UHF signal and the overvoltage signal.

[0068] A signal processor 10, which is connected to the signal separation interface 9 to filter and amplify the UHF signal and the overvoltage signal.

[0069] An oscilloscope 11, which is connected to the signal processor 10.

[0070] As Figure 4 shown, the measurement system of the gas-insulated device includes an insulating device UHF-overvoltage fusion sensor, a signal separation interface 9, an oscilloscope 11, and a gas-insulated device guide rod 12. Install the sensor at the manhole of the gas-insulated device to be detected; separate the UHF signal and the overvoltage signal with the signal separation interface 9; perform filtering processing on the detected UHF signal and overvoltage signal respectively; amplify the detected UHF signal; collect the UHF signal and the overvoltage signal, and output the signal through the oscilloscope 11.

[0071] Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0072] Only some exemplary embodiments of the present invention have been described above by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A UHF overvoltage fusion sensor for a gas-insulated equipment, characterized in that, It includes, a bottom plate, which includes a protruding frustum portion provided with a concave recess and a through hole penetrating the bottom plate downward along the bottom end of the recess; an interface, which is provided in the through hole and has an intermediate layer; a voltage-dividing insulating layer, which is adhesively bonded to the upper surface of the frustum portion via a conductive adhesive; an impedance transition structure, which is connected to the recess via a threaded structure, and the impedance transition structure is only connected to the intermediate layer by a conductive silver paste; a voltage-dividing arm, which is connected to the frustum portion via a threaded structure and surrounds the recess; a very high frequency dielectric layer, which is supported by the impedance transition structure; a very high frequency antenna board, which is supported by the very high frequency dielectric layer, and the very high frequency antenna board and the very high frequency dielectric layer are connected to the recess via a threaded structure, and a feed rod passes through the very high frequency dielectric layer and is conductively connected to the interface.

2. The UHF overvoltage fusion sensor for a gas insulated equipment according to claim 1, characterized in that Preferably, the frustum portion is a centrosymmetric structure, and the central axis of the recess, the central axis of the through hole and the median axis of the frustum portion are collinear.

3. The UHF overvoltage fusion sensor for a gas insulated equipment according to claim 2, characterized in that, The recess forms a conical depression.

4. The UHF overvoltage fusion sensor for a gas-insulated equipment according to claim 1, characterized in that The impedance transition structure gradually thickens in the direction away from the intermediate layer.

5. The UHF overvoltage fusion sensor for a gas-insulated device according to claim 1, characterized in that, The very high frequency dielectric layer is a truncated cone structure.

6. The UHF overvoltage fusion sensor for a gas insulated equipment according to claim 1, characterized in that, The voltage-dividing arm is an annular structure.

7. The UHF overvoltage fusion sensor for a gas-insulated equipment according to claim 1, characterized in that, The voltage-dividing arm and the bottom plate and the very high frequency antenna board jointly form a low-voltage arm capacitor in a capacitive voltage-dividing structure in an overvoltage frequency band, and the gas-insulated equipment guide rod and the voltage-dividing arm form a high-voltage arm capacitor in the capacitive voltage-dividing structure.

8. The UHF overvoltage fusion sensor for a gas-insulated equipment according to claim 1, characterized in that The very high frequency antenna board is a disc-shaped antenna structure, which is short-circuited to the bottom plate.

9. The UHF overvoltage fusion sensor for a gas-insulated equipment according to claim 1, characterized in that, The impedance transition structure is a geometric structure with a smooth transition between the interface and the voltage-dividing arm.

10. A measurement system for a gas-insulated equipment, characterized in that, It includes, a very high frequency overvoltage fusion sensor for a gas-insulated equipment according to any one of claims 1-9, which is installed on the gas-insulated equipment to measure very high frequency signals and overvoltage signals; a signal separation interface, which is connected to the very high frequency overvoltage fusion sensor to separate the very high frequency signals and overvoltage signals; a signal processor, which is connected to the signal separation interface to filter and amplify the very high frequency signals and overvoltage signals; an oscilloscope, which is connected to the signal processor.

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