Oil-filled sleeve monitoring sensor

Abstract

The invention provides an oil-filled sleeve monitoring sensor. The oil-filled sleeve monitoring sensor comprises an aluminum alloy shell, a Teflon hollowed-out shell and a stainless steel shell arranged between the aluminum alloy shell and the Teflon hollowed-out shell. A pressure sensor, a hydrogen sensor, a UHF (Ultra High Frequency) sensor and a PCB (Printed Circuit Board) are arranged in the Teflon hollow shell; and the PCB is respectively connected with the pressure sensor, the hydrogen sensor and the UHF sensor. The sensors mounted on the circuit board are integrated together in a welding manner, so that the use space of the sensors is reduced, the sensors are more miniaturized and integrated, the future maintenance is greatly facilitated, and meanwhile, the shell for protecting the circuit board for mounting the sensors adopts a Teflon hollow structure, so that the sensor is corrosion-resistant, high-temperature-resistant and high-temperature-resistant, and the service life of the sensor is prolonged. And electromagnetic shielding of a metal material to the electromagnetic wave sensor can be avoided.

Description

Technical Field

[0001] The invention relates to the field of sensors, and in particular to an oil-filled casing monitoring sensor. Background Art

[0002] Oil-filled bushings, transformers and other low-oil equipment are one of the main equipment in the power system, playing a pivotal role in the power system, and their reliability directly affects the safe operation of transformers and power grids. Due to the particularity of the oil extraction structure of low-oil equipment, there are currently few effective live detection or online monitoring methods for oil-filled bushings and other low-oil equipment. If a simple and effective online monitoring method can be adopted to detect defects in time before the oil-filled bushing fails, and effective measures can be taken, major accidents can be avoided.

[0003] The prior art will arrange several different types of sensors in the insulating oil container, but most of them are split. For example, a Chinese invention patent discloses a three-in-one hydrogen sensor measurement device based on a transformer insulating bushing with application (patent) number CN202211502198.4, which is integrated by installing the hydrogen sensor, pressure sensor and temperature sensor in a cavity.

[0004] When multiple sensors are installed in a cavity for integration, there will be a "dead oil zone" problem, which will lead to a decrease in the detection accuracy and response rate of hydrogen, temperature and oil pressure. Summary of the invention

[0005] In view of this, the main purpose of the present invention is to solve the technical problem that when multiple sensors are installed in a cavity for integration, there will be a "dead oil zone" problem, which will lead to reduced detection accuracy and response rate of hydrogen, temperature and oil pressure.

[0006] The present invention provides an oil-filled casing monitoring sensor, comprising an aluminum alloy shell, a Teflon hollow shell, and a stainless steel shell arranged between the aluminum alloy shell and the Teflon hollow shell;

[0007] A pressure sensor, a hydrogen sensor, a UHF sensor and a PCB circuit board are installed in the Teflon hollow shell, and the PCB circuit board is connected to the pressure sensor, the hydrogen sensor and the UHF sensor respectively;

[0008] The aluminum alloy shell is provided with a through hole, the stainless steel T-shaped plug is provided with a threaded hole, and the aluminum alloy shell and the stainless steel T-shaped plug are fastened and connected by screws.

[0009] In some embodiments of the present invention, a hydrogen sensor and a pressure sensor are welded on the PCB circuit board;

[0010] A UHF sensor is arranged parallel to and below the PCB circuit board. The hydrogen sensor temperature, the pressure sensor and the UHF sensor are sealed and fixed through the square hole and the round hole of the cylindrical plug.

[0011] In some embodiments of the present invention, the T-shaped plug is provided with a first groove for installing an O-ring, and the cylindrical plug is provided with a second groove and a third groove for installing an O-ring.

[0012] In some embodiments of the present invention, a BNC connector and an aviation plug are installed on the back of the aluminum alloy housing (1), and the BNC connector and the aviation plug are connected to the processing circuit board via a metal connecting wire.

[0013] In some embodiments of the present invention, the processing circuit board is connected to the PCB circuit board and the UHF sensor respectively through metal connecting wires.

[0014] In some embodiments of the present invention, the Teflon hollow shell is connected to the stainless steel shell via external threads.

[0015] The oil-filled casing monitoring sensor provided by the present invention reduces the usage space of the sensor by integrating the sensors installed on the circuit board through welding, so that the sensor can be more miniaturized and integrated while monitoring more data, and greatly facilitates future maintenance. At the same time, the shell used to protect the sensor circuit board is made of a Teflon hollow structure, which is not only corrosion-resistant and high-temperature-resistant, but also can avoid electromagnetic shielding of the electromagnetic wave sensor by the metal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of an oil-filled casing monitoring sensor according to one embodiment of the present invention Figure 1 ;

[0017] Figure 2 A schematic diagram of the structure of an oil-filled casing monitoring sensor according to one embodiment of the present invention Figure 2 ;

[0018] Figure 3 A schematic diagram of a T-shaped plug of an oil-filled casing monitoring sensor according to an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of a cylindrical plug of an oil-filled casing monitoring sensor according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the internal processing circuit board and external connector structure of an oil-filled casing monitoring sensor according to one embodiment of the present invention.

[0021] The above drawings include the following reference numerals:

[0022] 1. Aluminum alloy shell; 2. Teflon hollow shell; 3. Stainless steel shell; 4. Pressure sensor; 5. Hydrogen sensor; 6. External thread; 7. Through hole; 8. Internal thread hole; 9. T-type plug; 10. Groove for installing O-ring; 12. PCB board; 13. UHF sensor; 14. Square hole; 15. Round hole; 16. Groove for installing O-ring; 17. Groove for installing O-ring; 18 Cylindrical plug; 19. Processing circuit board; 20. Aviation plug; 21. BNC head. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be appreciated that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only portions related to the relevant inventions are shown in the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] Embodiment 1

[0025] like Figure 1 to Figure 5 As shown, a small 4-in-1 oil-filled casing monitoring sensor comprises an aluminum alloy housing 1, a stainless steel housing 3, a Teflon hollow housing 2, and a pressure sensor 4, a hydrogen sensor 5, a UHF sensor 13 and a PCB circuit board 12 installed in the Teflon hollow housing 2; the aluminum alloy housing 1 is provided with three through holes 7, and the stainless steel T-type plug 9 is provided with three threaded holes 8. The housing 1 is fastened to the stainless steel T-type plug 9 by screws.

[0026] Embodiment 2

[0027] like Figure 1 to Figure 5 As shown, this embodiment is a further improvement on the basis of the first embodiment. The details are as follows:

[0028] A hydrogen sensor 5 and a pressure sensor 4 are welded on the PCB circuit board 12;

[0029] A UHF sensor 13 is arranged parallel to and below the PCB circuit board 12 . The hydrogen sensor 5 , the temperature sensor 4 , and the UHF sensor 13 are sealed and fixed through the square hole 14 and the round hole 15 of the cylindrical plug 18 .

[0030] The cylindrical plug 18 can not only fix the UHF sensor 13 , the hydrogen sensor 5 and the pressure sensor 4 , but also prevent the oil from flowing back into the aluminum alloy housing 1 .

[0031] Embodiment 3

[0032] like Figure 1 to Figure 5 As shown, this embodiment is a further improvement on the basis of the second embodiment. The details are as follows:

[0033] The T-shaped plug 9 is provided with a first groove 10 for installing an O-ring, and the cylindrical plug 18 is provided with a second groove 16 and a third groove 17 for installing an O-ring.

[0034] Embodiment 4

[0035] like Figure 1 to Figure 5 As shown, this embodiment is a further improvement on the basis of the first embodiment. The details are as follows:

[0036] A BNC connector 21 and an aviation plug 20 are installed on the back of the aluminum alloy housing (1), and the BNC connector 21 and the aviation plug 20 are connected to the processing circuit board 19 via a metal connecting wire.

[0037] Furthermore, the processing circuit board 19 is connected to the PCB circuit board 12 and the UHF sensor 13 respectively through metal connecting wires.

[0038] Embodiment 5

[0039] like Figure 1 to Figure 5 As shown, this embodiment is a further improvement on the basis of embodiment 1. The details are as follows:

[0040] The Teflon hollow shell 2 is connected to the stainless steel shell 3 via an external thread 6 .

[0041] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An oil-filled casing monitoring sensor, characterized in that: It comprises an aluminum alloy shell (1), a Teflon hollow shell (2), and a stainless steel shell (3) arranged between the aluminum alloy shell (1) and the Teflon hollow shell (2); A pressure sensor (4), a hydrogen sensor (5), a UHF sensor (13) and a PCB circuit board (12) are installed in the Teflon hollow shell (2), and the PCB circuit board (12) is connected to the pressure sensor (4), the hydrogen sensor (5) and the UHF sensor respectively; The aluminum alloy shell (1) is provided with a through hole (7), the stainless steel T-shaped plug (9) is provided with a threaded hole (8), and the aluminum alloy shell (1) and the stainless steel T-shaped plug (9) are fastened together by screws.

2. The oil-filled casing monitoring sensor according to claim 1, characterized in that: A hydrogen sensor (5) and a pressure sensor (4) are welded on the PCB circuit board (12); A UHF sensor (13) is arranged parallel to and below the PCB circuit board (12); the temperature of the hydrogen sensor (5), the pressure sensor (4) and the UHF sensor (13) are sealed and fixed through the square hole (14) and the round hole (15) of the cylindrical plug (18).

3. The oil-filled casing monitoring sensor according to claim 2, characterized in that: The T-shaped plug (9) is provided with a first groove (10) for installing an O-type sealing ring, and the cylindrical plug (18) is provided with a second groove (16) and a third groove (17) for installing an O-type sealing ring.

4. The oil-filled casing monitoring sensor according to claim 1, characterized in that: A BNC connector (21) and an aviation plug (20) are installed on the back of the aluminum alloy housing (1); the BNC connector (21) and the aviation plug (20) are connected to a processing circuit board (19) via a metal connecting wire.

5. The oil-filled casing monitoring sensor according to claim 4, characterized in that: The processing circuit board (19) is respectively connected to the PCB circuit board (12) and the UHF sensor (13) via metal connecting wires.

6. The oil-filled casing monitoring sensor according to claim 1, characterized in that: The Teflon hollow shell (2) is connected to the stainless steel shell (3) via an external thread (6).

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