Fluorescent optical fiber mounting device for arc light protection of air switch cabinet

Abstract

The invention relates to a fluorescent optical fiber mounting device for arc light protection of an air switch cabinet, and aims to improve the mounting reliability and long-term stability of a fluorescent optical fiber in the switch cabinet. According to the method, an in-cabinet installation device and an inter-cabinet protection device are included, and effective monitoring and protection of fluorescent optical fibers are ensured. The in-cabinet installation device is composed of an installation base made of epoxy resin and fixing rings, the fixing rings are arranged on the installation base at equal intervals, and the fluorescent optical fibers are fixed to the base through the fixing rings to provide necessary protection. The inter-cabinet protection device comprises a first protection disc, a second protection disc, a protection pipe and a fixing groove, and all the components are made of epoxy resin materials and have good insulation performance. And the protection tube is connected with the protection disc through the side wall hole, so that the fluorescent optical fiber is prevented from being damaged when penetrating through the switch cabinet. The material characteristic of the fluorescent optical fiber is matched with the arc discharge spectrum, and interference of ambient light is effectively inhibited. The invention provides a reliable, simple and convenient fluorescent optical fiber installation scheme which is suitable for monitoring the arc of the switch cabinet and has good economic benefits and social benefits.

Description

Technical Field

[0001] The invention relates to the field of switch cabinet arc monitoring, and in particular to a fluorescent optical fiber installation device for arc protection of air switch cabinets. Background Art

[0002] Air switch cabinet is a key equipment in the power distribution system, mainly used for the control, protection and distribution of power lines. It can realize the current breaking, load management, short circuit and overload protection, and ensure the safe operation of the power system. As an important link in directly supplying power to users, the reliability of air switch cabinet directly affects the stability and safety of power supply. Its effective operation not only ensures the continuity of daily power consumption, but also reduces the risk caused by equipment failure, thereby reducing economic losses and social impact. Therefore, air switch cabinet plays an indispensable role in modern power systems. In the existing switch cabinet arc monitoring, the commonly used fluorescent optical fiber fixing method is mostly achieved by simple pasting or mechanical structure. However, the pasting fixing method has the risk of fluorescent optical fiber falling off during long-term use, resulting in unstable monitoring; while the use of metal structure and other methods enhances the fixing effect, it is easy to interfere with the electrical structure in the switch cabinet and the installation is complicated, especially when long-distance fluorescent optical fiber needs to be arranged. It is more limited. In addition, the existing technology lacks effective measures to protect the fluorescent optical fiber from passing through the switch cabinet structure, which easily causes the optical fiber to break during the cabinet penetration process. The above problems directly affect the installation reliability and long-term monitoring effect of the fluorescent optical fiber.

[0003] After searching, the Chinese patent publication number CN202211205820.5 discloses a switch cabinet partial discharge sound and light joint positioning system and method. The system uses fluorescent optical fiber as an optical sensor for partial discharge positioning. The fluorescent optical fiber is fixed to the inner side of the flange by gluing, and the flange is fixed in the middle of the three end panels of the switch cabinet body. This method uses fluorescent optical fiber sensors to detect and locate partial discharges. It has the advantages of accurate positioning and anti-electromagnetic interference by arranging multiple measuring points inside the switch cabinet and combining sound and light detection. However, this method does not propose specific fluorescent optical fiber installation details, such as optical fiber materials, flange materials, glue materials, etc. The fluorescent optical fiber is only fixed to the flange by gluing, which cannot guarantee the long-term and reliable use of the fluorescent optical fiber in the switch cabinet, and there is a risk of the fluorescent optical fiber falling off.

[0004] After searching, the Chinese patent publication number CN202323493847.1 discloses a fluorescent fiber optic temperature measuring device for a switch cabinet. In the device, the fluorescent optical fiber is fixed in the slot of the sliding rod, and the sliding rod can be extended into the interior of the switch cabinet through the sliding device on the right inner wall of the switch cabinet to measure the temperature. The sliding rod device realizes the fixation of the fluorescent fiber optic sensor, which is conducive to quick installation and avoids the use of limiting tools such as screws. However, the disadvantage of this method is that it is necessary to drill holes in the side wall of the switch cabinet, the device is large in size and made of metal, which will affect the internal electrical structure of the switch cabinet. In addition, this method can only fix fluorescent optical fibers within 2m, and cannot achieve the overall layout of tens of meters of fluorescent optical fibers. Summary of the invention

[0005] The present invention proposes a fluorescent optical fiber installation device for arc protection of air switch cabinets, designs a fluorescent optical fiber installation structure inside the switch cabinet, and is divided into an in-cabinet installation device and an inter-cabinet protection device. Through the above two structures, the fluorescent optical fiber can be reliably fixed inside the switch cabinet for arc monitoring.

[0006] The purpose of the present invention can be achieved through the following technical solutions: an in-cabinet installation device fixes the fluorescent optical fiber on the side wall of the switch cabinet, and an inter-cabinet protection device protects the fluorescent optical fiber from breaking when passing through the switch cabinet.

[0007] The method for installing fluorescent optical fiber of arc protection device in air switch cabinet mainly comprises an in-cabinet installation device, an inter-cabinet protection device and a fluorescent optical fiber. The in-cabinet installation device comprises an installation base and a fixing ring. The inter-cabinet protection device comprises a first protection plate, a second protection plate, a first fixing groove, a second fixing groove and a protection tube.

[0008] The mounting base (4) is 40 mm wide and 5 mm thick, and its length is determined by the layout position of the switch cabinet. The material is epoxy resin, and the edge of the mounting base (4) is chamfered. The fixing ring (5) and the mounting base (4) are integrally cast with epoxy resin, and the fixing ring (5) has a diameter of 30 mm and a thickness of 5 mm.

[0009] The first protection plate (6) and the second protection plate (10) are cylinders with an outer diameter of 30 mm, an inner diameter of 5 mm, a thickness of 10 mm, and are made of epoxy resin. The protection tube (10) is a cylinder with an outer diameter of 10 mm, an inner diameter of 5 mm, and a length of 16 mm.

[0010] The wavelength range of arc discharge in the switch cabinet covers 220nm-1000nm. Among them, the peak wavelengths of the phase-to-phase discharge spectrum are 327.4nm and 515.5nm; the peak wavelengths of the surface flashover discharge spectrum are 327.4nm, 515.5nm, 410.2nm, 434.0nm, 486.1nm and 656.3nm; the peak wavelengths of the single-phase grounding discharge spectrum are 327.4nm, 302.1nm, 349.8nm and 425.4nm. Using fluorescent optical fiber to detect ultraviolet light in the arc can avoid interference from ambient visible light during operation.

[0011] The cladding material of the fluorescent optical fiber (3) is polymethyl methacrylate (PMMA), the core material is polystyrene (PS), and the diameter is 1 mm. The core of the fluorescent optical fiber (3) is doped with rhodamine (Rhodamine 6G), the emission spectrum range is 400nm-550nm, the peak is 437nm, and the absorption spectrum range of the fluorescent optical fiber (3) is 400nm-550nm, and the peak wavelength is 375nm.

[0012] Preferably, the in-cabinet installation device (1) is arranged on the upper side wall of the cable room and the busbar room of the air switch cabinet. The installation base (4) is bonded to the inner wall of the air switch cabinet using silicone rubber, and the left and right sides and the bottom of the installation base (4) are chamfered.

[0013] Preferably, the fixing ring and the mounting base are integrally cast with epoxy resin, and the fixing rings are evenly distributed on one side of the mounting base with an interval of 50 mm. During installation, the fluorescent optical fiber passes through the middle of the fixing ring and is fixed between the mounting base and the fixing ring.

[0014] Preferably, holes are drilled in the side walls of the adjacent switch cabinets, the hole diameter is 10 mm, and the edges are chamfered.

[0015] Preferably, the protection tube passes through the hole in the side wall of the switch cabinet, and the ends of the protection tube are threaded 7 mm on both sides, which can be threadedly connected with the inner side of the fixing groove of the protection plate. The first protection plate and the second protection plate can fix the protection tube in the hole in the side wall of the switch cabinet.

[0016] When the fluorescent optical fiber is connected between the switch cabinets, it passes through the first protection plate, the protection tube, and the second protection plate in sequence. The cabinet protection device can prevent the fluorescent optical fiber from being cut by the side wall hole of the switch cabinet.

[0017] Compared with the prior art, the present invention solves the problems of poor fixing reliability, complex installation and easy breakage of fluorescent optical fiber in the prior art by designing an in-cabinet installation device and an inter-cabinet protection device. The in-cabinet installation device uses an installation base and a fixing ring integrally formed with epoxy resin to firmly fix the fluorescent optical fiber on the side wall of the switch cabinet, and the base is adhered by silicone rubber to ensure insulation and long-term stability in an electrical environment. The inter-cabinet protection device is threadedly connected to the protection tube through a protection plate to ensure the integrity of the optical fiber when the switch cabinet passes through the cabinet, and avoids damage to the optical fiber due to the side wall hole. This technical solution effectively improves the layout flexibility and reliability of fluorescent optical fiber in the switch cabinet, enhances the stability and installation convenience of the arc detection system, and meets the requirements of long-term monitoring and wiring reliability for arc fault detection in the switch cabinet. The cladding material of the fluorescent optical fiber of the present invention is polymethyl methacrylate (PMMA), and the core material is polystyrene (PS), with a diameter of 1mm. The fluorescent material doped in the core of the fluorescent optical fiber is rhodamine (Rhodamine 6G), and the emission spectrum range is 400nm-550nm, with a peak value of 437nm. The optical fiber absorption spectrum proposed by the present invention matches the switch cabinet arc radiation spectrum, and has the advantage of efficiently detecting switch cabinet arcs. The present invention can reliably fix the fluorescent optical fiber in the switch cabinet through the in-cabinet protection device, and can fix the fluorescent optical fiber through the switch cabinet through the inter-cabinet protection device, thereby achieving the advantages of convenient installation and long-term reliability of the fluorescent optical fiber inside the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the overall installation of a fluorescent optical fiber installation method inside a switch cabinet.

[0019] Figure 2 The figure is a schematic diagram of a method for installing fluorescent optical fiber inside a switch cabinet and a device for installing the optical fiber inside the cabinet.

[0020] Figure 3 The diagram is a schematic diagram of a method for installing fluorescent optical fiber inside a switch cabinet and an inter-cabinet protection device.

[0021] Among them, 1 is the in-cabinet protection device; 2 is the inter-cabinet protection device; 3 is the fluorescent optical fiber; 4 is the mounting base; 5 is the fixing ring; 6 is the first protection plate; 7 is the second protection plate; 8 is the first fixing groove; 9 is the second fixing groove; 10 is the protection tube. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments proposed in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0026] Example 1: The overall installation diagram of the fluorescent optical fiber of the switch cabinet of the present invention is as follows Figure 1 As shown, the fluorescent optical fiber (3) is fixed to the side wall inside the switch cabinet through the in-cabinet protection device (1), and the switch cabinet is arranged through the inter-cabinet protection device (2). The arc fault of the switch cabinet mainly occurs in the busbar room and the cable room. The busbar room is located in the upper half of the switch cabinet, and the cable room is located in the rear lower half of the switch cabinet. In order to achieve efficient monitoring of the switch cabinet arc, the fluorescent optical fiber (3) of the busbar room is arranged on the upper side panel of the switch cabinet, and the fluorescent optical fiber of the cable room is arranged on the rear side panel of the switch cabinet.

[0027] The in-cabinet installation device (1) is integrally cast with epoxy resin, and the installation base (4) is adhered to the side wall of the switch cabinet by silicone rubber. The installation base (4) is 40 mm wide and 5 mm thick. The fluorescent optical fiber (3) passes through the fixing ring (5) and is fixed in the switch cabinet.

[0028] The first protection plate (6) and the second protection plate (7) of the inter-cabinet protection device are designed with fixing grooves (8, 9) with a diameter of 10 mm, and the fixing grooves (8, 9) have threads inside, and the threads of the protection tube (10) can be connected to the protection plates (6, 7). Before installing the inter-cabinet protection device (2), a small hole with a diameter of 10 mm needs to be drilled on the side wall of the switch cabinet for placing the protection tube (10).

[0029] Embodiment 2: The schematic diagram of the structure of the fluorescent optical fiber cabinet installation device of the present invention is as follows Figure 2 As shown, the in-cabinet installation device (1) comprises an installation base (4) and a fixing ring (5). The in-cabinet installation device is processed by pouring epoxy resin, the relative dielectric constant of the epoxy resin is 3.5, and is fixed to the inner wall of the switch cabinet using silicone rubber with the same relative dielectric constant as an adhesive.

[0030] The fixing rings (5) are distributed on the mounting base (4) at intervals of 5 cm. The fluorescent optical fiber (3) passes through the fixing ring (5) to fix the fluorescent optical fiber (3) in the mounting device (1) in the cabinet, thereby protecting the fluorescent optical fiber (3).

[0031] Silicone rubber can withstand temperatures between -60°C and +200°C, has good anti-aging properties against ultraviolet rays, ozone and oxygen, and is suitable for fixing the mounting base (4).

[0032] Embodiment 3: The schematic diagram of the structure of the fluorescent optical fiber cabinet protection device of the present invention is as follows Figure 3 As shown, the cabinet protection device (2) comprises a first protection plate (6), a second protection plate (7), a first fixing groove (8), a second fixing groove (9) and a protection tube (10).

[0033] The first protection plate (6), the second protection plate (7) and the protection tube (10) are all made of epoxy resin material. The outer diameter of the protection plate is 30 mm, and there is a fixing groove (8) with a diameter of 10 mm in the middle. There is a through hole with a diameter of 5 mm in the fixing groove (8), and the fixing groove (8) is designed with a thread inside.

[0034] The protection tube (10) has an outer diameter of 10 mm and an inner diameter of 5 mm, and has a thread at the end, which can be connected with the thread in the fixing groove (8). The inner diameter of the protection tube (10) is 5 mm and is a through hole for passing the fluorescent optical fiber (3).

[0035] The protection tube (10) is fixed to a circular hole with a diameter of 5 mm on the side wall of the switch cabinet. Both ends of the protection tube (10) are connected to the protection plates (6) and (7). The overall inter-cabinet protection device (2) is fixed to the circular hole on the side wall of the switch cabinet.

Claims

1. A fluorescent optical fiber installation device for arc protection of air switch cabinet, characterized in that: The installation method comprises an in-cabinet installation device (1), an inter-cabinet protection device (2), a fluorescent optical fiber (3), a mounting base (4), and a fixing ring (5). The inter-cabinet protection device (2) comprises a first protection plate (6), a second protection plate (7), a first fixing groove (8), a second fixing groove (9), and a protection tube (10).

2. A fluorescent optical fiber installation device for arc protection of air switch cabinet according to claim 1, characterized in that: The in-cabinet installation device (1) consists of a mounting base (4) and a fixing ring (5). Preferably, the mounting base (4) is 40 mm wide and 5 mm thick, and its length is determined by the layout position of the switch cabinet. The material is epoxy resin, and the edge of the mounting base (4) is chamfered. The fixing ring (5) and the mounting base (4) are integrally cast with epoxy resin, and the fixing ring (5) has a diameter of 30 mm and a thickness of 5 mm.

3. The fluorescent optical fiber installation device for arc protection of air switch cabinet according to claim 1, characterized in that: The cabinet protection device (2) is composed of a first protection plate (6), a protection tube (10), and a second protection plate (7). Preferably, the first protection plate (6) and the second protection plate (10) are cylinders with an outer diameter of 30 mm, an inner diameter of 10 mm, a thickness of 10 mm, and are made of epoxy resin. The first protection plate (6) and the second protection plate (10) are respectively designed with a first fixing groove (8) and a second fixing groove (9) with a diameter of 10 mm, and the fixing grooves are threaded. The protection tube (10) is a cylinder with an outer diameter of 10 mm, an inner diameter of 5 mm, and a length of 17 mm. The end of the protection tube (10) is threaded.

4. A fluorescent optical fiber installation device for arc protection of air switch cabinet according to claim 1, characterized in that: The cladding material of the fluorescent optical fiber (3) is polymethyl methacrylate (PMMA), the core material is polystyrene (PS), and the diameter is 1 mm. The core of the fluorescent optical fiber (3) is doped with rhodamine (Rhodamine 6G), the emission spectrum range is 400nm-550nm, the peak is 437nm, and the absorption spectrum range of the fluorescent optical fiber (3) is 400nm-550nm, and the peak wavelength is 375nm.

5. A fluorescent optical fiber installation device for arc protection of air switch cabinet, characterized in that: Preferably, the fixing rings (5) are installed on the mounting base (4) at intervals of 50 mm, and the fluorescent optical fiber (3) passes through the interior of the fixing ring (5).

6. A fluorescent optical fiber installation device for arc protection of air switch cabinet, characterized in that: The protection tube (10) passes through the hole between two parallel air switch cabinets. A channel is designed in the middle of the protection tube (10) for the fluorescent optical fiber (3) to pass through. The fluorescent optical fiber (3) passes through the center of the first protection plate (6), the inside of the protection tube (10) and the center of the second protection plate (7) in sequence.

7. A fluorescent optical fiber installation device for arc protection of air switch cabinet, characterized in that: The in-cabinet installation device (1) is arranged on the side wall of the air switch cabinet. The installation base (4) is bonded to the inner wall of the air switch cabinet using silicone rubber, and the left and right sides and the bottom of the installation base (4) are chamfered.

8. A fluorescent optical fiber installation device for arc protection of air switch cabinet, characterized in that: The inter-cabinet protection device is installed in the side hole of the switch cabinet. The first protection plate (6) and the second protection plate (7) are bonded to the inner wall where the hole is located using silicone rubber, and 1 mm thick silicone rubber is used to fill the gaps around and at the bottom. A through hole is set in the center of the first protection plate (6) and the second protection plate (7).

9. A fluorescent optical fiber installation device for arc protection of air switch cabinet, characterized in that: The fluorescent optical fiber (3) passes through a fixing ring (5) inside the switch cabinet, and passes through a first protection plate (6), a protection tube (10), and a second protection plate (7) between switch cabinets.

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