Optical fiber ultrasonic sensor for measuring GIS partial discharge

Abstract

The utility model relates to an optical fiber ultrasonic sensor for measuring GIS partial discharge, which comprises a metal shell and a sensor body, the metal shell comprises a metal top plate, a metal side plate and a metal bottom plate which are sequentially arranged along the vertical direction and are fixedly attached, and a cavity for placing the sensor body is formed among the metal top plate, the metal side plate and the metal bottom plate. A core shaft fixedly connected with the inner side wall of the metal bottom plate is arranged in the cavity, the sensor body is placed on the top of the core shaft, and a pressing plate which is pressed on the top of the sensor body and fixedly connected with the core shaft is arranged above the core shaft. According to the utility model, the sensor body in the metal shell can be clamped and fixed, so that the sensor is firm and inmovable in the metal shell, and full shielding of the sensor body can be realized, so that a good anti-interference effect is achieved, and the measurement accuracy is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical design, in particular to an optical fiber ultrasonic sensor for measuring partial discharge of GIS. Background Technique

[0002] With the continuous development of power equipment in China, higher requirements are put forward for gas-insulated metal-enclosed high-voltage switchgear (GIS). In order to improve the reliability of GIS operation, partial discharge signals are mostly collected to detect insulation hidden dangers and faults in advance. At present, the commonly used methods for measuring partial discharge are ultra-high frequency partial discharge measurement and ultrasonic partial discharge measurement technologies. However, the measurement accuracy and range of these two measurement technologies are limited and do not achieve ideal results.

[0003] Therefore, a new type of optical fiber ultrasonic measurement technology has emerged. This technology converts the discharge signal into an optical fiber ultrasonic signal and then transmits it to the background system for integration and analysis, which can more accurately and timely detect insulation hidden dangers and defects inside GIS and ensure the safe and stable operation of the power system.

[0004] However, this new type of partial discharge measurement technology has good measurement effects in the laboratory, but there are still some drawbacks in practical applications. First, various complex high-voltage electromagnetic field interferences during the operation of GIS affect the measurement accuracy; second, the outdoor humid environment is not conducive to the long-term use of the sensor; third, there is a lack of a simple application scheme for fixing in GIS equipment. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides an optical fiber ultrasonic sensor for measuring partial discharge of GIS, which can clamp and fix the sensor body inside the metal shell, make the sensor firm and immovable inside the metal shell, and can also achieve full shielding of the sensor body, thereby achieving a good anti-interference effect and ensuring the measurement accuracy.

[0006] The utility model is realized by the following technical scheme: An optical fiber ultrasonic sensor for measuring partial discharge of GIS is provided, which includes a metal shell and a sensor body. The metal shell includes a metal top plate, a metal side plate and a metal bottom plate which are arranged in sequence vertically and are fixedly attached. A cavity for placing the sensor body is formed between the metal top plate, the metal side plate and the metal bottom plate. A core shaft fixedly connected to the inner side wall of the metal bottom plate is arranged in the cavity. The sensor body is placed on the top of the core shaft, and a pressing plate pressing on the top of the sensor body and fixedly connected to the core shaft is arranged above the core shaft.

[0007] During the use of the utility model, by setting a metal shell and a sensor body, and the metal shell includes a metal top plate, a metal side plate and a metal bottom plate which are arranged in sequence along the vertical direction and are fixedly attached to each other. A cavity for placing the sensor body is formed between the metal top plate, the metal side plate and the metal bottom plate. A mandrel fixedly connected to the inner side wall of the metal bottom plate is arranged in the cavity. The sensor body is placed on the top of the mandrel. A pressing plate which presses on the top of the sensor body and is fixedly connected to the mandrel is arranged above the mandrel. When the device is in use, it is necessary to first fix the metal top plate to the GIS access cover plate, so as to install the device on the GIS, and clamp and fix the sensor body through the pressing plate and the mandrel, so that it remains relatively fixed with the metal shell. This can not only clamp and fix the sensor body in the metal shell, making the sensor firm and immovable in the metal shell, but also achieve full shielding of the sensor body, thus playing a good anti-interference effect, and further ensuring the measurement accuracy.

[0008] Preferably, a blind groove adapted to the sensor body is formed at the top of the mandrel. The sensor body is placed in the blind groove, and the upper end surface of the sensor body is higher than the upper end surface of the mandrel. By forming a blind groove adapted to the sensor body at the top of the mandrel, and the sensor body is placed in the blind groove, and the upper end surface of the sensor body is higher than the upper end surface of the mandrel, and using the blind groove and the pressing plate to fix the sensor body, the stability of the device during use can be improved, and the sensor body can be prevented from moving during the use of the device.

[0009] Preferably, a through hole is formed in the metal top plate. The pressing plate is located in the through hole. A circumferentially closed stepped groove is formed on the outer peripheral surface of the mandrel. The inner side wall of the metal top plate presses on the stepped groove. By forming a through hole in the metal top plate, and the pressing plate is located in the through hole, and a circumferentially closed stepped groove is formed on the outer peripheral surface of the mandrel, and the inner side wall of the metal top plate presses on the stepped groove, the stability of the mandrel during the use of the device can be improved.

[0010] Preferably, a first counterbore is formed in the outer sidewall of the metal top plate. A first threaded rod is disposed in the first counterbore. The first threaded rod passes through the metal top plate and is fastened to the top of the metal side plate. A second counterbore is formed in the outer sidewall of the metal bottom plate. A second threaded rod is disposed in the second counterbore. The second threaded rod passes through the metal bottom plate and is fastened to the bottom of the metal side plate. By forming a first counterbore in the outer sidewall of the metal top plate, disposing a first threaded rod in the first counterbore, passing the first threaded rod through the metal top plate and fastening it to the top of the metal side plate, forming a second counterbore in the outer sidewall of the metal bottom plate, disposing a second threaded rod in the second counterbore, and passing the second threaded rod through the metal bottom plate and fastening it to the bottom of the metal side plate, the metal side plate is fixed to the metal top plate and the metal bottom plate respectively by the first threaded rod and the second threaded rod, which can improve the connection effect between the metal side plate and the metal top plate and the metal bottom plate during the use of the device and improve the stability of the device during use.

[0011] Preferably, a first sealing ring and a second sealing ring that are closed along the circumferential direction of the core shaft are respectively installed at the top and bottom of the metal side plate. The metal side plate and the metal top plate are sealed by the first sealing ring, and the metal side plate and the metal bottom plate are sealed by the second sealing ring. By respectively installing a first sealing ring and a second sealing ring that are closed along the circumferential direction of the core shaft at the top and bottom of the metal side plate, sealing the metal side plate and the metal top plate with the first sealing ring, and sealing the metal side plate and the metal bottom plate with the second sealing ring, the first sealing ring and the second sealing ring can be used to prevent moisture in the air from entering the metal shell during the use of the device, which is convenient for the staff to use the device for outdoor operations.

[0012] Preferably, a third counterbore is formed in the outer sidewall of the metal bottom plate. A third threaded rod is disposed in the third counterbore. The third threaded rod passes through the metal bottom plate and is fastened to the core shaft. A fourth counterbore is formed in the outer sidewall of the pressing plate. A fourth threaded rod is disposed in the fourth counterbore. The fourth threaded rod passes through the pressing plate and the inner hole of the sensor body and is fastened to the core shaft. By providing a third counterbore in the outer sidewall of the metal bottom plate, disposing a third threaded rod in the third counterbore, passing the third threaded rod through the metal bottom plate and fastening it to the core shaft, forming a fourth counterbore in the outer sidewall of the pressing plate, disposing a fourth threaded rod in the fourth counterbore, and passing the fourth threaded rod through the pressing plate and the inner hole of the sensor body and fastening it to the core shaft, the third threaded rod and the fourth threaded rod can improve the stability of the device during use and prevent the core shaft and the pressing plate from moving in the metal shell during use, thereby causing the sensor body to move accordingly.

[0013] Preferably, an optical fiber holder is fixedly installed on the outer side wall of the metal side plate, and one end of the optical fiber holder penetrates into the metal shell. By fixedly installing an optical fiber holder on the outer side wall of the metal side plate and enabling one end of the optical fiber holder to penetrate into the metal shell, the optical fiber holder can facilitate the sensor body to convert the discharge signal into an optical fiber ultrasonic signal and then transmit it to the background system for integrated analysis.

[0014] Preferably, a third sealing ring that is circumferentially closed along the optical fiber holder is further arranged on the outer side wall of the metal side plate, and the optical fiber holder and the metal shell are sealed through the third sealing ring. By arranging a third sealing ring that is circumferentially closed along the optical fiber holder on the outer side wall of the metal side plate and sealing the optical fiber holder and the metal shell through the third sealing ring, the third sealing ring can prevent moisture in the air from entering the interior of the metal shell through the possible gap between the optical fiber holder and the metal shell during the use of the device, facilitating the staff to use the device for outdoor operations.

[0015] Preferably, two fifth counterbores are formed at the bottom of the metal top plate, and the two fifth counterbores are respectively located on the left and right sides of the metal shell, and fifth threaded rods are arranged in the fifth counterbores. By forming two fifth counterbores at the bottom of the metal top plate, with the two fifth counterbores respectively located on the left and right sides of the metal shell and fifth threaded rods arranged in the fifth counterbores, the fifth counterbores and the fifth threaded rods can facilitate the staff to fix the metal top plate to the GIS socket cover plate.

[0016] Preferably, a fourth sealing ring that is circumferentially closed along the through hole is installed on the top of the metal top plate. By installing a fourth sealing ring that is circumferentially closed along the through hole on the top of the metal top plate, when the metal top plate is fixed to the GIS socket cover plate, the fourth sealing ring can contact the GIS socket cover plate, thereby preventing moisture in the air from entering the interior of the metal shell through the through hole during the use of the device, facilitating the staff to use the device for outdoor operations.

[0017] The beneficial effects of the present utility model are as follows: By providing a metal housing and a sensor body, and the metal housing includes a metal top plate, a metal side plate, and a metal bottom plate that are arranged in sequence vertically and are fixedly attached to each other. A cavity for placing the sensor body is formed between the metal top plate, the metal side plate, and the metal bottom plate. A mandrel fixedly connected to the inner side wall of the metal bottom plate is provided in the cavity. The sensor body is placed on the top of the mandrel, and a pressing plate that presses on the top of the sensor body and is fixedly connected to the mandrel is provided above the mandrel. When the device is in use, it is necessary to first fix the metal top plate to the GIS access cover plate, so that the device is installed on the GIS, and the sensor body is clamped and fixed by the pressing plate and the mandrel, so that it remains relatively fixed with the metal housing. This can not only clamp and fix the sensor body in the metal housing, making the sensor firm and immovable in the metal housing, but also achieve full shielding of the sensor body, thereby achieving a good anti-interference effect, and further ensuring the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the application of the present utility model in a GIS device;

[0020] As shown in the figure:

[0021] 1. Metal top plate, 2. Metal side plate, 3. Metal bottom plate, 4. Second sealing ring, 5. Optical fiber holder, 6. First threaded rod, 7. Mandrel, 8. Pressing plate, 9. Sensor body, 10. Fourth sealing ring, 11. Fifth threaded rod, 12. Third threaded rod, 13. Third sealing ring, 14. First sealing ring, 15. Fourth threaded rod, 16. Second threaded rod, 17. Through hole, 18. Step groove, 19. Blind groove, 20. GIS access cover plate, 21. GIS. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific embodiments.

[0023] As Figure 1 - Figure 2 shown, the fiber optic ultrasonic sensor for measuring GIS partial discharge of the present utility model includes a metal housing and a sensor body 9. The metal housing includes a metal top plate 1, a metal side plate 2, and a metal bottom plate 3 that are arranged in sequence vertically and are fixedly attached to each other. A cavity for placing the sensor body 9 is formed between the metal top plate 1, the metal side plate 2, and the metal bottom plate 3. A mandrel 7 fixedly connected to the inner side wall of the metal bottom plate 3 is provided in the cavity. The sensor body 9 is placed on the top of the mandrel 7, and a pressing plate 8 that presses on the top of the sensor body 9 and is fixedly connected to the mandrel 7 is provided above the mandrel 7.

[0024] By providing a blind groove 19 on the top of the mandrel 7 that is adapted to the sensor body 9, and placing the sensor body 9 in the blind groove 19 with the upper end face of the sensor body 9 higher than the upper end face of the mandrel 7, and fixing the sensor body 9 with the blind groove 19 and the pressure plate 8, the stability of the device during use can be improved, and the sensor body 9 can be prevented from moving during the use of the device. By providing a through hole 17 on the metal top plate 1, with the pressure plate 8 located in the through hole 17, and providing a circumferentially closed stepped groove 18 on the outer peripheral surface of the mandrel 7, the inner side wall of the metal top plate 1 is pressed against the stepped groove 18, which can improve the stability of the mandrel 7 during the use of the device. By providing a first counterbore on the outer side wall of the metal top plate 1, with a first threaded rod 6 disposed in the first counterbore, the first threaded rod 6 passing through the metal top plate 1 and fastened to the top of the metal side plate 2, and providing a second counterbore on the outer side wall of the metal bottom plate 3, with a second threaded rod 16 disposed in the second counterbore, the second threaded rod 16 passing through the metal bottom plate 3 and fastened to the bottom of the metal side plate 2, fixing the metal side plate 2 to the metal top plate 1 and the metal bottom plate 3 respectively with the first threaded rod 6 and the second threaded rod 16 can improve the connection effect between the metal side plate 2, the metal top plate 1 and the metal bottom plate 3 during the use of the device, and improve the stability of the device during use. By respectively installing a first sealing ring 14 and a second sealing ring 4 that are circumferentially closed along the mandrel 7 at the top and bottom of the metal side plate 2, the metal side plate 2 and the metal top plate 1 are sealed by the first sealing ring 14, and the metal side plate 2 and the metal bottom plate 3 are sealed by the second sealing ring 4. Using the first sealing ring 14 and the second sealing ring 4 can prevent moisture in the air from entering the metal housing during the use of the device, facilitating the staff to use the device for outdoor operations. By providing a third counterbore on the outer side wall of the metal bottom plate 3, with a third threaded rod 12 disposed in the third counterbore, the third threaded rod 12 passing through the metal bottom plate 3 and fastened to the mandrel 7, and providing a fourth counterbore on the outer side wall of the pressure plate 8, with a fourth threaded rod 15 disposed in the fourth counterbore, the fourth threaded rod 15 passing through the pressure plate 8 and the inner hole of the sensor body 9 and fastened to the mandrel 7, using the third threaded rod 12 and the fourth threaded rod 15 can improve the stability of the device during use, preventing the mandrel 7 and the pressure plate 8 from moving in the metal housing during the use of the device, and thus preventing the sensor body 9 from moving along with them. By fixedly installing an optical fiber holder 5 on the outer side wall of the metal side plate 2, with one end of the optical fiber holder 5 extending into the metal housing, using the optical fiber holder 5 can facilitate the sensor body 9 to convert the discharge signal into an optical fiber ultrasonic signal and then transmit it to the background system for integration and analysis. By further providing a third sealing ring 13 that is circumferentially closed along the optical fiber holder 5 on the outer side wall of the metal side plate 2, and sealing the optical fiber holder 5 and the metal housing with the third sealing ring 13, using the third sealing ring 13 can prevent moisture in the air from entering the metal housing through the possible gap between the optical fiber holder 5 and the metal housing during the use of the device, facilitating the staff to use the device for outdoor operations.By providing two fifth counterbores at the bottom of the metal top plate 1, which are respectively located on the left and right sides of the metal housing, and a fifth threaded rod 11 is arranged in the fifth counterbore, it is convenient for the staff to fix the metal top plate 1 to the GIS nozzle cover plate 20 by using the fifth counterbore and the fifth threaded rod 11. By installing a fourth sealing ring 10 that closes circumferentially along the through hole 17 on the top of the metal top plate 1, when the metal top plate 1 is fixed on the GIS nozzle cover plate 20, the fourth sealing ring 10 can be in contact with the GIS nozzle cover plate 20, so as to prevent moisture in the air from entering the interior of the metal housing through the through hole 17 during the use of the device, which is convenient for the staff to use the device for outdoor operations. The metal top plate 1 is made of aluminum material.

[0025] Combined with the attached Figure 1 - 2 As can be seen, the usage method of the present utility model is as follows: First, by rotating the fifth threaded rod 11 in the fifth counterbore, the fifth threaded rod 11 is screwed into the GIS nozzle cover plate 20 to fix the metal top plate 1 to the GIS nozzle cover plate 20, so that the device is installed on the GIS 21, and the fourth sealing ring 10 is in contact with the GIS nozzle cover plate 20. The sensor body 9 is clamped and fixed by the pressure plate 8 and the core shaft 7, so that it remains stationary in the blind groove 19 and is relatively fixed to the metal housing. The full shielding of the sensor body 9 is realized through the metal top plate 1, the metal side plate 2, the metal bottom plate 3, the core shaft 7 and the pressure plate 8. The optical fiber frame 5 can facilitate the conversion of the discharge signal of the sensor body 9 into an optical fiber ultrasonic signal and then transmit it to the background system for integration and analysis.

[0026] Of course, the above description is not limited to the above examples. The technical features not described in the present utility model can be realized by or adopted from the prior art, and will not be elaborated here. The above embodiments and drawings are only used to illustrate the technical solutions of the present utility model and are not limitations to the present utility model. The present utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model do not depart from the purpose of the present utility model and should also fall within the scope of the claims of the present utility model.

Claims

1. An optical fiber ultrasonic sensor for measuring partial discharge in GIS, comprising a metal shell and a sensor body (9), characterized in that: The metal housing includes a metal top plate (1), a metal side plate (2), and a metal bottom plate (3) which are arranged in sequence vertically and are fixedly attached. A cavity for placing the sensor body (9) is formed among the metal top plate (1), the metal side plate (2), and the metal bottom plate (3). A core shaft (7) fixedly connected to the inner side wall of the metal bottom plate (3) is arranged in the cavity. The sensor body (9) is placed on the top of the core shaft (7). A pressing plate (8) which presses on the top of the sensor body (9) and is fixedly connected to the core shaft (7) is arranged above the core shaft (7).

2. The fiber optic ultrasonic sensor for measuring partial discharge in GIS according to claim 1, wherein: A blind slot (19) adapted to the sensor body (9) is formed at the top of the core shaft (7). The sensor body (9) is placed in the blind slot (19), and the upper end face of the sensor body (9) is higher than the upper end face of the core shaft (7).

3. The fiber optic ultrasonic sensor for measuring partial discharge of GIS according to claim 2, characterized in that: A through hole (17) is formed in the metal top plate (1). The pressing plate (8) is located in the through hole (17). A step slot (18) closed in the circumferential direction is formed on the outer peripheral surface of the core shaft (7), and the inner side wall of the metal top plate (1) presses on the step slot (18).

4. The fiber optic ultrasonic sensor for measuring partial discharge in GIS according to claim 3, characterized in that: A first counterbore is formed on the outer side wall of the metal top plate (1). A first threaded rod (6) is arranged in the first counterbore. The first threaded rod (6) passes through the metal top plate (1) and is fastened to the top of the metal side plate (2). A second counterbore is formed on the outer side wall of the metal bottom plate (3). A second threaded rod (16) is arranged in the second counterbore. The second threaded rod (16) passes through the metal bottom plate (3) and is fastened to the bottom of the metal side plate (2).

5. The fiber optic ultrasonic sensor for measuring partial discharge in GIS according to claim 4, characterized in that: A first sealing ring (14) and a second sealing ring (4) which are closed in the circumferential direction of the core shaft (7) are respectively installed at the top and the bottom of the metal side plate (2). The metal side plate (2) and the metal top plate (1) are sealed through the first sealing ring (14), and the metal side plate (2) and the metal bottom plate (3) are sealed through the second sealing ring (4).

6. The fiber optic ultrasonic sensor for measuring GIS partial discharge according to claim 3, wherein: A third counterbore is formed on the outer side wall of the metal bottom plate (3). A third threaded rod (12) is arranged in the third counterbore. The third threaded rod (12) passes through the metal bottom plate (3) and is fastened to the core shaft (7). A fourth counterbore is formed on the outer side wall of the pressing plate (8). A fourth threaded rod (15) is arranged in the fourth counterbore. The fourth threaded rod (15) passes through the pressing plate (8) and the inner hole of the sensor body (9) and is fastened to the core shaft (7).

7. The fiber optic ultrasonic sensor for measuring GIS partial discharge according to claim 2, characterized in that: An optical fiber holder (5) is also fixedly installed on the outer side wall of the metal side plate (2), and one end of the optical fiber holder (5) penetrates into the metal housing.

8. The fiber optic ultrasonic sensor for measuring partial discharge in GIS according to claim 7, wherein: A third sealing ring (13) which is closed in the circumferential direction of the optical fiber holder (5) is also arranged on the outer side wall of the metal side plate (2). The optical fiber holder (5) and the metal housing are sealed through the third sealing ring (13).

9. The fiber optic ultrasonic sensor for measuring partial discharge in GIS according to claim 6, characterized in that: Two fifth counterbores are formed at the bottom of the metal top plate (1), and the two fifth counterbores are respectively located on the left and right sides of the metal housing. A fifth threaded rod (11) is arranged in the fifth counterbores.

10. The fiber optic ultrasonic sensor for measuring partial discharge in GIS according to claim 9, characterized in that: A fourth sealing ring (10) which is closed in the circumferential direction of the through hole (17) is installed at the top of the metal top plate (1).

Images