GIS ultra-high frequency partial discharge sensor

Abstract

This utility model discloses a GIS UHF partial discharge sensor, comprising: a housing with a first partition in the middle, a first cavity below the first partition, and three independent cavities above the first partition; a UHF PCB antenna housed in the first cavity, with the bottom of the first cavity sealed with epoxy resin potting compound; a power supply housed in the second cavity; a UHF signal processing board housed in the third cavity; and a low-frequency communication board housed in the fourth cavity. The third cavity and the fourth cavity are separated by a third partition, the third partition being at least 1.5 mm thick and having slots for transmission lines to pass through. This utility model, by using a third partition to separate the UHF signal processing board and the low-frequency communication board into two separate cavities, can significantly reduce the problem of the UHF signal processing board being easily interfered with by the digital noise of the low-frequency communication board.

Description

Technical Field

[0001] This utility model relates to the field of partial discharge detection technology for power equipment, and in particular to a GIS ultra-high frequency partial discharge sensor. Background Technology

[0002] GIS (Gas Insulated Substation) equipment refers to metal-enclosed switchgear that uses gas, rather than air at atmospheric pressure, as the insulating medium, either entirely or partially. Typically, the gas used is sulfur hexafluoride. Due to its advantages such as small footprint, high reliability, and long maintenance cycle, GIS equipment is widely used in high-voltage, ultra-high-voltage, and extra-high-voltage power transmission and transformation systems.

[0003] Partial discharge is a major cause of insulation failures in GIS equipment. To ensure the safe and stable operation of GIS equipment, it is necessary to monitor internal partial discharge.

[0004] Currently, a commonly used method for partial discharge detection is the UHF measurement method, which uses an external GIS UHF partial discharge sensor mounted on the outside of the metal flange of the basin insulator to detect partial discharge. However, due to the compact internal space of current GIS UHF partial discharge sensors, the UHF signal processing board and the low-frequency communication board are often arranged in a shared cavity. This makes the UHF signal processing board highly susceptible to digital noise interference from the low-frequency communication board, resulting in a decrease in the signal-to-noise ratio, signal distortion, and even false alarms or missed alarms. Utility Model Content

[0005] The technical problem to be solved by this utility model is to improve the internal structure of the existing GIS UHF partial discharge sensor in order to reduce the problem that the UHF signal processing board is easily affected by the digital noise interference of the low-frequency communication board.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a GIS ultra-high frequency partial discharge sensor is provided, which includes:

[0007] The housing has a first partition in the middle, a first cavity below the first partition, and a second, third and fourth cavity that are independent of each other above the first partition.

[0008] An ultra-high frequency PCB antenna is placed in the first cavity; wherein, the bottom of the first cavity is sealed with epoxy resin potting compound, so that the ultra-high frequency PCB antenna is sealed in the first cavity;

[0009] The power supply is placed in the second cavity;

[0010] The ultra-high frequency signal processing board is placed in the third cavity;

[0011] A low-frequency communication board is placed in the fourth cavity;

[0012] The third cavity and the fourth cavity are separated by a third partition, the thickness of which is not less than 1.5 mm; and the third partition is provided with a slot to allow the transmission line connecting the ultra-high frequency signal processing board and the low frequency communication board to pass through.

[0013] Furthermore, the housing includes a housing body and a housing top cover;

[0014] The first partition is disposed in the middle of the main body of the housing;

[0015] The shell top cover is detachably installed on the top of the shell body, sealing the tops of the second cavity, the third cavity and the fourth cavity.

[0016] Furthermore, the connection between the top cover and the main body of the housing is sealed with a waterproof gasket to prevent external moisture from entering the interior of the housing through the gap between them.

[0017] Furthermore, the top cover of the housing is fixedly connected to the housing body by screws, and the waterproof gasket is provided with an opening for the screw to pass through.

[0018] Furthermore, the second cavity and the third cavity are separated by a second partition; and both the second partition and the third partition are vertically connected above the first partition.

[0019] Furthermore, the first partition, the second partition, and the third partition are integrally formed with the shell.

[0020] Furthermore, first slots are provided on both sides of the third cavity, and the two sides of the ultra-high frequency signal processing board are inserted into the third cavity through the first slots;

[0021] The fourth cavity is provided with second slots on both sides, and the low-frequency communication board is inserted into the fourth cavity through the second slots on both sides.

[0022] Furthermore, the height of the first cavity is not less than 20mm.

[0023] Furthermore, the bottom of the housing is an arc-shaped structure, and the two ends of the arc-shaped structure are provided with ear plates to facilitate fixing the housing to the GIS equipment.

[0024] Furthermore, the housing is provided with a switch button, a Lora antenna interface, and a spare Lora antenna interface at a position corresponding to the fourth cavity.

[0025] The beneficial effects of this utility model are as follows:

[0026] (1) By setting a third partition, the UHF signal processing board and the low-frequency communication board are separated into two cavities, and the thickness of the third partition is not less than 1.5mm, which can effectively physically isolate the high-frequency / low-frequency circuits and significantly reduce the problem that the UHF signal processing board is easily affected by the digital noise interference of the low-frequency communication board.

[0027] (2) The top cover of the housing is sealed with waterproof gaskets and screws, and the cavity where the UHF PCB antenna is located is sealed with epoxy resin potting glue. The whole machine can reach the IP67 protection level and can adapt to harsh environments such as outdoor rain, snow, high humidity, and salt spray.

[0028] (3) The third cavity is equipped with the first slot and the fourth cavity is equipped with the second slot, so that the UHF signal processing board and the low-frequency communication board can be quickly installed in the corresponding cavity by plugging and unplugging, which improves the convenience of installation and maintenance. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the UHF partial discharge sensor for GIS provided by this utility model;

[0030] Figure 2 yes Figure 1 Exploded view;

[0031] Figure 3 yes Figure 2 Exploded view of the main body of the inner shell and its internal components;

[0032] Figure 4 yes Figure 1 Cross-sectional structural diagram. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0034] See Figures 1 to 4 This utility model provides a GIS UHF partial discharge sensor, which includes: a housing 100, an UHF PCB antenna 200, a power supply 400, an UHF signal processing board 500, and a low-frequency communication board 600.

[0035] The housing 100 includes a housing body 110 and a housing top cover 120, both of which are die-cast from aluminum alloy. The interior of the housing body 110 is formed by four independent cavities through an integrally formed first partition 111, second partition 112, and third partition 113. The first partition 111 is horizontally positioned in the middle of the housing body 110. The second partition 112 and the third partition 113 are parallel to each other and vertically connected above the first partition 111. Below the first partition 111 is a first cavity 1a, which is an antenna cavity. A second cavity 1b is formed between the second partition 112 and the wall of the housing body 110, which is a power supply cavity. A third cavity 1c is formed between the second partition 112 and the third partition 113, which is a UHF signal processing cavity. A fourth cavity 1d is formed between the third partition 113 and the wall of the housing body 110, which is a communication control cavity. The housing top cover 120 is detachably installed on the top of the housing body 110, sealing the tops of the second cavity 1b, the third cavity 1c, and the fourth cavity 1d.

[0036] The ultra-high frequency PCB antenna 200 is placed in the first cavity 1a. The bottom of the first cavity 1a is sealed with epoxy resin potting compound 300, so that the ultra-high frequency PCB antenna 200 is sealed in the first cavity 1a.

[0037] The power supply 400 is placed in the second cavity 1b.

[0038] The ultra-high frequency signal processing board 500 is placed in the third cavity 1c.

[0039] The low-frequency communication board 600 is placed in the fourth cavity 1d.

[0040] The thickness of the third partition 113 is not less than 1.5 mm. Furthermore, the third partition 113 is provided with a slot 113a to allow the transmission line connecting the ultra-high frequency signal processing board 500 and the low frequency communication board 600 to pass through.

[0041] In this invention, the ultra-high frequency signal processing board 500 and the low frequency communication board 600 are respectively placed in the third cavity 1c and the fourth cavity 1d. The two cavities are separated by a third partition 113. The thickness of the third partition 113 is not less than 1.5mm, which can effectively physically isolate the high frequency / low frequency circuits and significantly reduce the problem that the ultra-high frequency signal processing board is easily affected by the digital noise interference of the low frequency communication board.

[0042] Preferred, see Figure 3The slot 113a is a shallow recessed groove provided on the upper surface of the third partition 113. The transmission line between the ultra-high frequency signal processing board 500 and the low frequency communication board 600 adopts an FPC cable, which is relatively thin and can pass directly through the shallow recessed groove.

[0043] Additionally, see Figure 4 The first partition 111 has a first slot 111a to allow the UHF PCB antenna 200 to connect with the first partition 111 and the components above it for signal transmission. (See also...) Figure 3 The second partition 112, the third partition 113, and the UHF signal processing board 500 are respectively provided with a second slot 112a, a third slot 113b, and a fourth slot 5a at corresponding positions. These slots allow the power cord of the power supply 400 to pass through, so that the power cord can be connected to the low-frequency communication board 600 to provide power. After conversion, the power can be transmitted to the UHF signal processing board 500 through the aforementioned FPC cable.

[0044] In this invention, the height of the first cavity 1a is not less than 20mm, so as to form a cavity structure of a certain thickness, which is conducive to the reflection of the signal to the antenna part, prevents the signal from radiating backward, isolates external interference, and improves impedance matching.

[0045] In this invention, the housing body 110 is provided with a switch button 910, a LoRa antenna interface 920, and a spare LoRa antenna interface 930 at a position corresponding to the fourth cavity 1d. The switch button 910 is used to control the partial discharge sensor to turn on and off, and the LoRa antenna interface 920 and the spare LoRa antenna interface 930 enable the partial discharge sensor to support dual-antenna redundant communication, which can improve the reliability of data transmission.

[0046] In a preferred embodiment, see Figure 2 The connection between the top cover 120 and the main body 110 is sealed by a waterproof gasket 700 to prevent external moisture from entering the interior of the housing 100 through the gap between them. The top cover 120 is fixedly connected to the main body 110 by screws 800. The waterproof gasket 700 has an opening 710 for the screws 800 to pass through, allowing the screws 800 to lock the position of the waterproof gasket 700 when the top cover 120 is connected.

[0047] Therefore, the top cover 120 of the housing and the main body 110 are sealed by a waterproof gasket 700 and screws 800, and the first cavity 1a where the UHF PCB antenna 200 is located is sealed with epoxy resin potting compound 300, so that the whole machine can reach the IP67 protection level and can adapt to harsh environments such as outdoor rain, snow, high humidity, and salt spray.

[0048] In a preferred embodiment, see Figure 3 The third cavity 1c has first slots 1c1 on both sides, and the ultra-high frequency signal processing board 500 is inserted into the third cavity 1c through the first slots 1c1 on both sides. The fourth cavity 1d has second slots 1d1 on both sides, and the low frequency communication board 600 is inserted into the fourth cavity 1d through the second slots 1d1 on both sides.

[0049] The slot design allows the UHF signal processing board 500 and the low-frequency communication board 600 to be quickly installed in their respective cavities via plug-and-play, improving the ease of installation and maintenance.

[0050] In a preferred embodiment, see Figures 1 to 3 The bottom of the housing 100 is an arc-shaped structure 114, and the two ends of the arc-shaped structure 114 are provided with ear plates 115 to facilitate fixing the housing 100 to the GIS equipment.

[0051] The aforementioned arc-shaped structure 114 allows the partial discharge sensor of this invention to be adapted to the flange of GIS equipment. The partial discharge sensor is fixed on the flange by connecting the clamp and the ear plate 115.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A GIS ultra-high frequency partial discharge sensor, characterized in that, include: The housing (100) has a first partition (111) in the middle, and a first cavity (1a) is below the first partition (111), and a second cavity (1b), a third cavity (1c) and a fourth cavity (1d) that are independent of each other are above the first partition (111). An ultra-high frequency PCB antenna (200) is placed in the first cavity (1a); wherein the bottom of the first cavity (1a) is sealed with epoxy resin potting compound (300) so that the ultra-high frequency PCB antenna (200) is sealed in the first cavity (1a); A power supply (400) is placed in the second cavity (1b); The ultra-high frequency signal processing board (500) is placed in the third cavity (1c); A low-frequency communication board (600) is placed in the fourth cavity (1d); The third cavity (1c) and the fourth cavity (1d) are separated by a third partition (113), the thickness of which is not less than 1.5mm; and the third partition (113) is provided with a slot (113a) for the transmission line connecting the ultra-high frequency signal processing board (500) and the low frequency communication board (600) to pass through.

2. The GIS UHF partial discharge sensor according to claim 1, characterized in that, The housing (100) includes a housing body (110) and a housing top cover (120). The first partition (111) is disposed in the middle of the housing body (110); The housing top cover (120) is detachably installed on the top of the housing body (110) to close the top of the second cavity (1b), the third cavity (1c) and the fourth cavity (1d).

3. The GIS UHF partial discharge sensor according to claim 2, characterized in that, The connection between the top cover (120) and the body (110) of the housing is sealed by a waterproof gasket (700) to prevent external moisture from entering the interior of the housing (100) through the gap between them.

4. A GIS UHF partial discharge sensor according to claim 3, characterized in that, The top cover (120) of the housing is fixedly connected to the housing body (110) by screws (800), and the waterproof gasket (700) is provided with an opening (710) for the screws (800) to pass through.

5. A GIS UHF partial discharge sensor according to claim 2, characterized in that, The second cavity (1b) and the third cavity (1c) are separated by a second partition (112); and the second partition (112) and the third partition (113) are both vertically connected above the first partition (111).

6. A GIS UHF partial discharge sensor according to claim 5, characterized in that, The first partition (111), the second partition (112), and the third partition (113) are integrally formed with the shell (100).

7. A GIS UHF partial discharge sensor according to claim 2, characterized in that, The third cavity (1c) has first slots (1c1) on both sides, and the ultra-high frequency signal processing board (500) is inserted into the third cavity (1c) through the first slots (1c1) on both sides. The fourth cavity (1d) has second slots (1d1) on both sides, and the low-frequency communication board (600) is inserted into the fourth cavity (1d) through the second slots (1d1) on both sides.

8. A GIS UHF partial discharge sensor according to claim 1, characterized in that, The height of the first cavity (1a) is not less than 20mm.

9. A GIS UHF partial discharge sensor according to claim 1, characterized in that, The bottom of the housing (100) is an arc-shaped structure (114), and the two ends of the arc-shaped structure (114) are provided with ear plates (115) to facilitate fixing the housing (100) to the GIS equipment.

10. A GIS UHF partial discharge sensor according to claim 1, characterized in that, The housing (100) is provided with a switch button (910), a Lora antenna interface (920) and a spare Lora antenna interface (930) at the position corresponding to the fourth cavity (1d).

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