Optical fiber penetrating device for oil immersed transformer, manufacturing method and assembling method

Abstract

The invention discloses an optical fiber penetrating device for an oil immersed transformer, a manufacturing method and an assembling method. The manufacturing method comprises the following steps: manufacturing and forming a first penetrating device shell and a second penetrating device shell; manufacturing and forming an optical fiber patch cord; placing the optical fiber main body of the optical fiber patch cord into a pre-designed mold for shaping to obtain an optical fiber main body with a preset shape; placing the optical fiber patch cord into the first through device shell and the second through device shell to be connected with the first through device shell and the second through device shell; performing glue filling and fixed connection on the first through device shell and the second through device shell to obtain the optical fiber through device; the method can improve the reliability of the optical fiber penetration device.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-immersed transformers, and particularly to an optical fiber penetrator for an oil-immersed transformer, a manufacturing method and an assembly method thereof. Background Art

[0002] The optical fiber penetrator device can not only safely lead the optical fiber out of the transformer, and transmit the optical signal detected by the internal optical fiber sensor to the demodulation system outside the transformer with low optical loss, but also effectively isolate the internal environment of the transformer from the external atmosphere. In addition, the optical fiber penetrator device is widely used in scenarios where sealed penetration is required, and plays an important role as a key part.

[0003] Reference Figure 1 , in the traditional optical fiber penetrator scheme, the inside includes a ceramic ferrule 2 and two jumper ferrules 1, that is, a jumper ferrule - ceramic ferrule - jumper ferrule structure. The jumper ferrules at both ends are used to connect with other optical fiber components outside. The ferrule structure needs to be prepared with a single-mode optical fiber with a smaller fiber diameter. The diameter of the single-mode optical fiber is about 8 - 10 microns. During the processing, for the connection of the jumper ferrule and the ceramic ferrule, it is necessary to align the single-mode optical fibers at both ends of the ferrule. However, it is difficult to align the ceramic ferrule and the optical fiber jumper ferrule with a micron-level fiber diameter, and the processing accuracy requirement is extremely high, resulting in a high production cost. In addition, when operating in the transformer oil tank for a long time, the vibration of the transformer causes the ceramic ferrule inside the penetrator to shift, and the core alignment structure is damaged, increasing the optical loss and affecting the measurement result. And the transformer oil will leak into the penetrator interior for a long time, making there be an additional oil film between the jumper ferrule and the ceramic ferrule, affecting the refractive index of light, and thus having a certain impact on the transmission of the optical signal.

[0004] Patent text CN 105675167A proposes a penetrator for optical fiber monitoring of an oil-immersed transformer and a preparation method thereof. The penetrator includes a hollow fastening bolt, a bolt cover that can cover the fastening bolt, and a connecting sleeve placed inside the fastening bolt, wherein an optical fiber is arranged inside the connecting sleeve; there are upper and lower sections of optical fiber sleeves outside the optical fiber. One section of the optical fiber sleeve penetrates through the through hole at the bottom of the fastening bolt, and the other section of the optical fiber sleeve penetrates through the through hole at the center of the bolt cover; the two sections of optical fiber sleeves are not closed, leaving a gap. The cross-section of the two sections of optical fiber sleeves is sealed with a sealant, and then a connecting sleeve is sleeved outside the cross-section between the two sections of optical fiber sleeves, and a sealant is filled between the connecting sleeve and the optical fiber sleeve for sealing and fixing. Although this scheme does not require the alignment of the optical fiber, in this method, it is necessary to sleeve the micron-level optical fiber with an optical fiber sleeve, and it is also necessary to apply glue to seal the cross-section of the optical fiber sleeve, and the processing accuracy requirement is also relatively high. And when filling the sealant between the connecting sleeve and the optical fiber sleeve, the thermal expansion coefficients of the sealant and the optical fiber do not match, and the sealant exerts extrusion on the optical fiber during condensation and curing, increasing the optical loss.

[0005] In addition, most of the existing optical fiber penetrators adopt a threaded structure on the outside (such as the above patent text), which is directly screwed to the adapter plate. To ensure the sealing performance, it is also necessary to use a high-temperature and oil-resistant glue for curing, which requires on-site manual operation. Moreover, problems such as aging and hardening of the high-temperature and oil-resistant colloid occur during long-term use, resulting in weakened sealing performance, thereby reducing the sealing performance of the penetrator, posing a risk of leakage of transformer oil, and being inconvenient for troubleshooting and secondary sealing, with insufficient long-term reliability. Summary of the Invention

[0006] The present invention provides an optical fiber penetrator, a manufacturing method, and an assembly method for an oil-immersed transformer, which can improve the reliability of the optical fiber penetrator.

[0007] A manufacturing method for an optical fiber penetrator for an oil-immersed transformer includes:

[0008] Manufacturing and forming a first penetrator housing and a second penetrator housing;

[0009] Manufacturing and forming an optical fiber jumper;

[0010] Placing the optical fiber body of the optical fiber jumper into a pre-designed mold for shaping to obtain an optical fiber body with a preset shape;

[0011] Placing the optical fiber jumper into the first penetrator housing and the second penetrator housing and connecting it to the first penetrator housing and the second penetrator housing;

[0012] Injecting glue and fixedly connecting the inside of the first penetrator housing and the second penetrator housing to obtain the optical fiber penetrator.

[0013] Further, manufacturing and forming a first penetrator housing and a second penetrator housing includes:

[0014] Stamping a metal part to respectively form a first cylindrical part and a second cylindrical part that are open at one end, closed at the other end, and hollow;

[0015] Respectively extending a step at the open end of the first cylindrical part and the second cylindrical part, and forming a first screw hole for housing connection and a second screw hole for adapter plate connection on the step;

[0016] Processing a connection hole at the closed end of the first cylindrical part or the second cylindrical part to obtain the first penetrator housing and the second penetrator housing.

[0017] Further, manufacturing and forming an optical fiber jumper includes:

[0018] Preparing a fiber core;

[0019] A cladding is formed outside the core, and the refractive index of the cladding is lower than that of the core;

[0020] A coating layer is formed outside the cladding;

[0021] A sheath is formed outside the coating layer to obtain the optical fiber body of the fiber optic patch cord;

[0022] Connectors are respectively installed at both ends of the optical fiber body to obtain the fiber optic patch cord.

[0023] Further, respectively installing connectors at both ends of the optical fiber body to obtain the fiber optic patch cord includes:

[0024] Peel off part of the sheath and coating layer at both ends of the optical fiber body to expose the core with the cladding of a preset length;

[0025] Insert the core with the cladding of a preset length into the ferrule of the connector and align it in the center, and make the end of the core with the cladding protrude from the ferrule of the connector;

[0026] Inject glue into the ferrule of the connector for fixation;

[0027] Grind the end of the core with the cladding that protrudes from the ferrule of the connector so that the end of the core is flush with the ferrule of the connector.

[0028] Further, the preset shape is a wavy shape;

[0029] Placing the optical fiber body of the fiber optic patch cord into a pre-designed mold for shaping to obtain an optical fiber body with a preset shape includes:

[0030] Place the optical fiber body of the fiber optic patch cord into a wavy mold and leave a gap between the optical fiber body and the inner wall of the mold;

[0031] Inject glue into the gap between the optical fiber body and the inner wall of the mold and cool it;

[0032] Remove the mold to obtain a wavy optical fiber body.

[0033] Further, inject silicone into the gap between the optical fiber body and the inner wall of the mold.

[0034] Further, placing the fiber optic patch cord into the first through connector housing and the second through connector housing and connecting it to the first through connector housing and the second through connector housing includes:

[0035] Connect the first connector at one end of the fiber optic patch cord to the connection hole of the first through connector housing through a matching first flange;

[0036] Connect the second connector at the other end of the fiber optic patch cord to the connection hole of the second penetrator housing through a matching second flange.

[0037] Further, after connecting the first connector at one end of the fiber optic patch cord to the connection hole of the first penetrator housing through a matching first flange, pot the first flange with silicone.

[0038] After connecting the second connector at the other end of the fiber optic patch cord to the connection hole of the second penetrator housing through a matching second flange, pot the second flange with silicone.

[0039] Further, after obtaining the first penetrator housing and the second penetrator housing, it further includes:

[0040] Form a perfusion hole on the first penetrator housing or the second penetrator housing.

[0041] Perform glue filling and fixed connection inside the first penetrator housing and the second penetrator housing to obtain the fiber optic penetrator, including:

[0042] Connect the first penetrator housing and the second penetrator housing with bolts adapted to the first screw holes.

[0043] Inject perfusion glue into the first penetrator housing and the second penetrator housing through the perfusion hole to obtain the fiber optic penetrator.

[0044] Further, inject epoxy resin into the first penetrator housing and the second penetrator housing through the perfusion hole to obtain the fiber optic penetrator.

[0045] Further, perform glue filling and fixed connection inside the first penetrator housing and the second penetrator housing to obtain the fiber optic penetrator, including:

[0046] Inject perfusion glue into the first penetrator housing and the second penetrator housing from the connection part of the first penetrator housing and the second penetrator housing, and inject perfusion glue into the gap between the step of the first penetrator housing and the step of the second penetrator housing.

[0047] Connect the first penetrator housing and the second penetrator housing with bolts adapted to the first screw holes to obtain the fiber optic penetrator.

[0048] Further, inject epoxy resin into the first penetrator housing and the second penetrator housing from the connection part of the first penetrator housing and the second penetrator housing, and inject epoxy resin into the gap between the step of the first penetrator housing and the step of the second penetrator housing.

[0049] Further, after steps are extended from one end of the opening of the first cylindrical member and the second cylindrical member respectively, it further includes:

[0050] Machining a sealing groove on the step of the first cylindrical member or the second cylindrical member.

[0051] An optical fiber penetrator for an oil-immersed transformer using the above manufacturing method, including a first penetrator housing, a second penetrator housing, and an optical fiber jumper. The optical fiber jumper is shaped into a preset shape through a pre-designed mold, the optical fiber jumper is connected within the first penetrator housing and the second penetrator housing, the first penetrator housing and the second penetrator housing are filled with a potting adhesive, and the first penetrator housing and the second penetrator housing are fixedly connected.

[0052] Further, the first penetrator housing and the second penetrator housing are of a cylindrical structure, with an opening formed at one end and a connection hole formed at the other end, and a step is extended from the end with the opening. A first screw hole for housing connection and a second screw hole for adapter plate connection are formed on the step.

[0053] Further, the optical fiber jumper includes an optical fiber main body and a first connector and a second connector respectively arranged at both ends of the optical fiber main body. The optical fiber main body sequentially includes a core, a cladding, a coating layer, and a sheath from inside to outside.

[0054] Further, the shape of the optical fiber main body is wavy.

[0055] Further, the first connector at one end of the optical fiber jumper is connected to the connection hole of the first penetrator housing through a matching first flange; the second connector at the other end of the optical fiber jumper is connected to the connection hole of the second penetrator housing through a matching second flange.

[0056] Further, a pouring hole is formed on the first penetrator housing or the second penetrator housing.

[0057] Further, the first penetrator housing and the second penetrator housing are connected through the first screw hole and a matching bolt.

[0058] Further, a sealing groove is provided on the step of the first penetrator housing or the second penetrator housing.

[0059] An assembly method for an optical fiber penetrator for an oil-immersed transformer obtained by using the above manufacturing method, including:

[0060] Fixing and connecting the optical fiber penetrator to an adapter plate through bolts and a sealing ring;

[0061] Connecting the adapter plate installed with the optical fiber penetrator to an oil-immersed transformer.

[0062] Furthermore, the second through - connector housing extends into the oil - immersed transformer. A sealing groove is provided on the step of the second through - connector housing. Second screw holes for connecting the adapter plate are machined on the steps of the first through - connector housing and the second through - connector housing. The adapter plate is provided with mounting holes and screw holes.

[0063] Fixing and connecting the fiber optic through - connector to the adapter plate with bolts and sealing rings includes:

[0064] Place the sealing ring in the sealing groove, and install the fiber optic through - connector in the mounting hole of the adapter plate through adaptation and bolts with the second screw holes.

[0065] Furthermore, the end of the second flange on the second through - connector housing is flush with the upper part of the inner wall of the oil - immersed transformer.

[0066] The fiber optic through - connector, manufacturing method and assembly method for an oil - immersed transformer provided by the present invention have at least the following beneficial effects:

[0067] (1) The through - connector housing with a cylindrical structure is used. Connection of itself and subsequent connection of the adapter plate are based on the screw holes on the steps at the connection of the two through - connector housings. Compared with the traditional threaded through - connector, when connecting with the adapter plate, it is not necessary to use high - temperature and oil - resistant glue for curing, avoiding the risk of leakage of transformer oil caused by the aging of the glue during long - term use, and improving the reliability of the long - term use of the fiber optic through - connector.

[0068] (2) The fiber optic jumper is used instead of the traditional ceramic ferrule solution. There is no longer a fiber core alignment structure inside the fiber optic through - connector, avoiding the problem that the vibration of the transformer during long - term operation in the transformer oil tank causes the damage of the fiber core alignment structure inside the fiber optic through - connector, avoiding the increase of optical loss, being convenient for batch preparation, and improving production efficiency.

[0069] (3) The two - end flanges support quick plug - and - play of the fiber optic jumper, realizing plug - and - play wiring, being convenient for maintenance and replacement of sensors. Or checking whether the screws are loose to judge the connection reliability of the through - connector, being convenient for quick replacement.

[0070] (4) The inside of the fiber optic through - connector is filled with glue, and epoxy resin is filled to ensure the sealing performance of the fiber optic through - connector to the greatest extent. It can not only prevent transformer oil from entering the inside of the fiber optic through - connector, but also enable the fiber optic through - connector to withstand higher oil pressure.

[0071] (5) The fiber body of the fiber optic jumper is pre - shaped into a wavy shape, which can avoid excessive extrusion of the fiber optic jumper during the condensation and curing of the poured epoxy resin, better cope with the thermal expansion and contraction of the potting material, reduce the degree of extrusion, and further reduce optical loss.

[0072] (6) Adopt the method of pouring glue into the optical fiber penetrator from the pouring hole. The operation is simple, the pouring reliability is high, and the pouring hole is located outside the oil-immersed transformer to ensure the sealing of the optical fiber penetrator;

[0073] (7) Adopt the method of pouring glue at the joint of the first penetrator housing and the second penetrator housing. There is no need to drill holes in the penetrator housing, saving processing steps. After filling the perfusion glue into the gap between the steps of the first penetrator housing and the steps of the second penetrator housing, then connect the penetrator housing, further ensuring the sealing of the optical fiber penetrator;

[0074] (8) The optical fiber penetrator adopts the fixing method of sealing rings and bolts. Not only the sealing performance is ensured, but even during long-term operation under the vibration condition of the transformer, if the screws become loose, just turn the screws, which is convenient for equipment operation and maintenance and secondary reinforcement of the seal, and the long-term reliability is higher;

[0075] (9) The end of the flange on the penetrator housing located inside the oil-immersed transformer is flush with the upper part of the inner wall of the oil-immersed transformer, avoiding the risk of tip discharge and avoiding interference with the monitoring of optical fiber sensors, especially ultrasonic sensors;

[0076] (10) Adopt silicone rubber to pot the flange and epoxy resin to pot the inside of the penetrator, improving the overall sealing performance and compressive performance of the penetrator. Description of the Drawings

[0077] Figure 1 It is a schematic structural diagram of an existing optical fiber penetrator.

[0078] Figure 2 It is a flowchart of an embodiment of the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0079] Figure 3 It is a flowchart of an embodiment of manufacturing the penetrator housing in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0080] Figure 4 It is a flowchart of an embodiment of manufacturing the optical fiber jumper in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0081] Figure 5 It is a flowchart of an embodiment of installing the connector in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0082] Figure 6 It is a flowchart of an embodiment of shaping the optical fiber main body in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0083] Figure 7Flow chart of an embodiment of the connection between the optical fiber jumper and the penetrator housing in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0084] Figure 8 Flow chart of an embodiment of pouring glue into the penetrator housing in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0085] Figure 9 Flow chart of the second embodiment of pouring glue into the penetrator housing in the manufacturing method of the optical fiber penetrator for oil-immersed transformers provided by the present invention.

[0086] Figure 10 Exploded view of an embodiment of the optical fiber penetrator for oil-immersed transformers provided by the present invention. Detailed implementation manners

[0087] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0088] Embodiment 1

[0089] Refer to Figure 2 , this embodiment provides a manufacturing method of an optical fiber penetrator for oil-immersed transformers, including:

[0090] S1. Manufacture and form the first penetrator housing and the second penetrator housing;

[0091] S2. Manufacture and form the optical fiber jumper;

[0092] S3. Place the optical fiber body of the optical fiber jumper into a pre-designed mold for shaping to obtain an optical fiber body with a preset shape;

[0093] S4. Place the optical fiber jumper into the first penetrator housing and the second penetrator housing and connect it with the first penetrator housing and the second penetrator housing;

[0094] S5. Pour glue and fixedly connect the inside of the first penetrator housing and the second penetrator housing to obtain the optical fiber penetrator.

[0095] Furthermore, refer to Figure 3 , in step S1, manufacturing and forming the first penetrator housing and the second penetrator housing includes:

[0096] S11. Stamp the metal parts to respectively form a first cylindrical part and a second cylindrical part that are open at one end, closed at the other end, and hollow;

[0097] S12. Extend steps at one open end of the first cylindrical component and the second cylindrical component respectively, and form a first screw hole for housing connection and a second screw hole for adapter board connection on the steps.

[0098] S13. Machine a connection hole at the closed end of the first cylindrical component or the second cylindrical component to obtain the first penetrator housing and the second penetrator housing.

[0099] Specifically, in step S11, the metal part can be stainless steel, which has higher oil pressure resistance. The metal part is stamped to form a first cylindrical component and a second cylindrical component with one end open and the other end closed. The first cylindrical component and the second cylindrical component are hollow structures.

[0100] Further, in step S12, extend steps at one open end of the first cylindrical component and the second cylindrical component respectively. The working surface of the steps is perpendicular to the axis of the first cylindrical component and the second cylindrical component. Form a first screw hole for housing connection and a second screw hole for adapter board connection on the working surface of the steps. The connection between the first penetrator housing and the second penetrator housing can be realized by the cooperation of a matching bolt and the first screw hole, and the connection between the fiber optic penetrator and the adapter board can be realized by the second screw hole and a matching bolt.

[0101] Further, in step S13, machine a connection hole at the closed end of the first cylindrical component or the second cylindrical component to obtain the first penetrator housing and the second penetrator housing. The connection hole is used to connect a flange, and the flange is used to connect the connector of the fiber optic jumper. One side of the flange is potted in the fiber optic penetrator to connect the internal fiber optic jumper, and the other side is used to connect the fiber optic component inside the oil-immersed transformer to form an optical path, which is convenient for optical signals to be transmitted to the external demodulation system.

[0102] Further, referring to Figure 4 , in step S2, manufacture a fiber optic jumper, including:

[0103] S21. Prepare the fiber core.

[0104] S22. Form a cladding outside the fiber core, and the refractive index of the cladding is lower than that of the fiber core.

[0105] S23. Form a coating layer outside the cladding.

[0106] S24. Form a sheath outside the coating layer to obtain the fiber optic body of the fiber optic jumper.

[0107] S25. Install connectors at both ends of the fiber optic body respectively to obtain the fiber optic jumper.

[0108] Specifically, in step S21, the core is located in the innermost layer and serves as the main channel for optical signal transmission. The diameter and refractive index of the core determine the transmission characteristics of the optical fiber. The core diameter of single-mode optical fiber is usually 8 - 10 micrometers, while that of multi-mode optical fiber is 50 or 62.5 micrometers, and the material is generally silica.

[0109] Furthermore, in step S22, the cladding is wrapped around the core and confines the optical signal within the core for transmission through the principle of total internal reflection, preventing signal leakage. It is also made of high-purity silica, but its refractive index is slightly lower than that of the core.

[0110] Furthermore, in step S23, the coating layer is directly covered on the outside of the cladding, providing mechanical protection and environmental isolation, preventing the optical fiber from being damaged due to bending, stretching, or external environmental factors (such as humidity, chemicals), and is usually made of ultraviolet-cured acrylate or other polymer materials.

[0111] Furthermore, in step S24, the sheath is the outermost protective structure of the fiber optic patch cord, further enhancing the mechanical strength and durability of the fiber optic patch cord.

[0112] Furthermore, referring to Figure 5 , in step S25, connectors are respectively installed at both ends of the optical fiber main body to obtain the fiber optic patch cord, including:

[0113] S25a. Strip off a part of the sheath and coating layer at both ends of the optical fiber main body to expose the core with the cladding of a preset length;

[0114] S25b. Insert the core with the cladding of the preset length into the ferrule of the connector and align it in the center, and make the end of the core with the cladding protrude from the ferrule of the connector;

[0115] S25c. Glue and fix the ferrule of the connector;

[0116] S25d. Grind the end of the core with the cladding that protrudes from the ferrule of the connector so that the end of the core is flush with the ferrule of the connector.

[0117] Specifically, the connector is preferably an FC interface type connector. The FC interface does not require screw fixation, as there is a risk of discharge when screws are inside the transformer.

[0118] Furthermore, in step S3, the preset shape is a wavy shape.

[0119] Referring to Figure 6 , place the optical fiber main body of the fiber optic patch cord into a pre-designed mold for shaping to obtain an optical fiber main body with a preset shape, including:

[0120] S31. Place the optical fiber body of the fiber optic jumper into a wavy mold, and leave a gap between the optical fiber body and the inner wall of the mold;

[0121] S32. Inject glue into the gap between the optical fiber body and the inner wall of the mold and cool it;

[0122] S33. Remove the mold to obtain a wavy optical fiber body.

[0123] Specifically, in step S31, the wavy mold can be designed according to actual needs. The amplitude of the wave can be determined through simulation or experiment, and the amplitude of the wave needs to meet the requirement that after subsequent glue injection, it can maximize the avoidance of excessive extrusion of the fiber optic jumper during the condensation and curing of epoxy resin, thereby increasing optical loss.

[0124] Further, in step S32, when injecting glue into the gap between the optical fiber body and the inner wall of the mold, preferably silicone glue is used.

[0125] Further, in step S33, after removing the mold, the epoxy resin attached to the optical fiber body keeps the optical fiber body in a wavy shape, which is convenient for subsequent perfusion.

[0126] Further, referring to Figure 7 , in step S4, connecting the fiber optic jumper into the first through - connector housing and the second through - connector housing and connecting it with the first through - connector housing and the second through - connector housing includes:

[0127] S41. Connect the first connector at one end of the fiber optic jumper to the connection hole of the first through - connector housing through a matching first flange;

[0128] S42. Connect the second connector at the other end of the fiber optic jumper to the connection hole of the second through - connector housing through a matching second flange.

[0129] Among them, the interface types of the first flange and the second flange are the same as the interface types of the first connector and the second connector at both ends of the fiber optic jumper.

[0130] Specifically, in actual application, the first through - connector housing or the second through - connector housing in the fiber optic through - connector extends into the oil - immersed transformer, and the corresponding flange is also placed in the oil - immersed transformer. The fiber optic components in the oil - immersed transformer are connected to the corresponding flange, and the flange located outside the oil - immersed transformer is connected to an external fiber optic device, realizing the transmission of optical signals from the oil - immersed transformer to the outside.

[0131] Preferably, after connecting the first connector at one end of the fiber optic jumper to the connection hole of the first through - connector housing through a matching first flange, use silicone glue to pot the first flange;

[0132] After connecting the second connector at the other end of the fiber optic patch cord to the connection hole of the second penetrator housing through a matching second flange, silicone is used to pot the second flange.

[0133] Silicone has a better sealing effect, so it is used for potting the flange.

[0134] Further, in step S1, after obtaining the first penetrator housing and the second penetrator housing, it further includes:

[0135] S14. Form a perfusion hole on the first penetrator housing or the second penetrator housing.

[0136] Preferably, the perfusion hole can be processed on the penetrator housing located outside the oil-immersed transformer. For example, in actual use, if the first penetrator housing is located outside the oil-immersed transformer, the perfusion hole is processed on the first penetrator housing.

[0137] Further, referring to Figure 8 , in step S5, potting and fixedly connecting the first penetrator housing and the second penetrator housing to obtain the fiber optic penetrator, including:

[0138] S51. Connect the first penetrator housing and the second penetrator housing through bolts adapted to the first screw holes;

[0139] S52. Inject the potting glue into the first penetrator housing and the second penetrator housing through the perfusion hole to obtain the fiber optic penetrator.

[0140] Specifically, in this embodiment, first connect the first penetrator housing and the second penetrator housing, specifically by fixing and connecting through the first screw holes on the steps of the first penetrator housing and the second penetrator housing and the adapted bolts. Then, pot the glue into the first penetrator housing and the second penetrator housing from the perfusion hole. Preferably, it is epoxy resin. Since the fiber body of the fiber optic patch cord in the first penetrator housing and the second penetrator housing is wavy, it can avoid excessive extrusion of the fiber optic patch cord when the epoxy resin condenses and solidifies, thereby increasing the optical loss. The inside of the fiber optic penetrator is filled with epoxy resin, which not only makes the inside full and has better sealing performance, but also can withstand higher oil pressure without damage, and the risk of leaking transformer oil is lower.

[0141] Silicone has a better sealing effect, but its strength is insufficient. Therefore, the flange is potted with silicone, and the inside of the penetrator is potted with epoxy resin to improve the overall sealing performance and compressive performance of the penetrator.

[0142] The manufacturing method of the fiber optic penetrator for an oil-immersed transformer provided in this embodiment has at least the following beneficial effects:

[0143] (1) The penetrator housing adopts a cylindrical structure and is connected to itself and the subsequent adapter plate based on the screw holes on the steps at the connection of the two penetrator housings. Compared with the traditional threaded penetrator, when connecting to the adapter plate, it is not necessary to use high-temperature and oil-resistant glue for curing, avoiding the risk of leakage of transformer oil caused by the aging of the glue during long-term use, and improving the reliability of the fiber optic penetrator during long-term use;

[0144] (2) The traditional ceramic ferrule solution is replaced with a fiber optic jumper. It only needs to be aligned with the external fiber optic equipment through the flanges at both ends of the fiber optic penetrator. There is no longer a fiber core alignment structure inside the fiber optic penetrator, avoiding the problem that the vibration of the transformer during long-term operation in the transformer oil tank causes the fiber core alignment structure inside the fiber optic penetrator to be damaged, avoiding an increase in optical loss, facilitating batch preparation, and improving production efficiency;

[0145] (3) The flanges at both ends support the quick insertion and extraction of the fiber optic jumper, realizing pluggable wiring, facilitating the maintenance and replacement of sensors. Or check whether the screws are loose to judge the connection reliability of the penetrator, facilitating quick replacement;

[0146] (4) The inside of the fiber optic penetrator is filled with glue, and epoxy resin is filled to ensure the tightness of the fiber optic penetrator to the greatest extent. It can not only prevent transformer oil from entering the inside of the fiber optic penetrator, but also enable the fiber optic penetrator to withstand higher oil pressure;

[0147] (5) The fiber body of the fiber optic jumper is pre-shaped into a wavy shape, which can avoid excessive extrusion of the fiber optic jumper during the condensation and curing of the epoxy resin perfusion, better cope with the thermal expansion and contraction of the potting material, reduce the degree of extrusion, and thus reduce optical loss;

[0148] (6) The method of filling glue into the fiber optic penetrator from the perfusion hole is adopted. The operation is simple, the perfusion reliability is high, and the perfusion hole is located outside the oil-immersed transformer to ensure the tightness of the fiber optic penetrator;

[0149] (7) The flange is potted with silicone rubber, and the inside of the penetrator is potted with epoxy resin to improve the overall sealing performance and compressive performance of the penetrator.

[0150] Example 2

[0151] Reference Figure 2 , this embodiment provides a manufacturing method for a fiber optic penetrator for an oil-immersed transformer, including:

[0152] S1. Manufacture and form the first penetrator housing and the second penetrator housing;

[0153] S2. Manufacture and form the fiber optic jumper;

[0154] S3. Place the optical fiber body of the fiber optic jumper into a pre-designed mold for shaping to obtain an optical fiber body with a preset shape;

[0155] S4. Place the fiber optic jumper into the first through connector housing and the second through connector housing and connect it to the first through connector housing and the second through connector housing;

[0156] S5. Inject glue into the first through connector housing and the second through connector housing and fixedly connect them to obtain the fiber optic through connector.

[0157] For the specific implementation manners of steps S1, S2, S3, and S4, please refer to Embodiment 1 and will not be elaborated here.

[0158] Similarly, after placing the fiber optic jumper into the first through connector housing and the second through connector housing and connecting it to the first through connector housing and the second through connector housing, use silicone to pot the first flange and the second flange.

[0159] Specifically, refer to Figure 9 , in step S5, injecting glue into the first through connector housing and the second through connector housing and fixedly connecting them to obtain the fiber optic through connector includes:

[0160] S5a. Inject the potting glue into the first through connector housing and the second through connector housing from the connection part of the first through connector housing and the second through connector housing, and inject the potting glue at the gap between the steps of the first through connector housing and the steps of the second through connector housing;

[0161] S5b. Connect the first through connector housing and the second through connector housing with bolts adapted to the first screw holes to obtain the fiber optic through connector.

[0162] Specifically, in this embodiment, the method of potting first and then connecting the first through connector housing and the second through connector housing is adopted. After connecting the fiber optic jumper to the inside of the first through connector housing and the second through connector housing, inject glue from the connection part of the first through connector housing and the second through connector housing, that is, the gap between the opposite surfaces of the two steps of the first through connector housing and the second through connector housing. The potting glue is preferably epoxy resin. After the glue injection is completed, inject epoxy resin at the gap between the steps of the first through connector housing and the steps of the second through connector housing. After cooling and extrusion, connect the first through connector housing and the second through connector housing with bolts adapted to the first screw holes, so that the gap between the steps of the first through connector housing and the steps of the second through connector housing is filled with the potting glue to ensure the sealing performance of the fiber optic through connector.

[0163] The manufacturing method of the fiber optic through connector for oil-immersed transformers provided in this embodiment has at least the following beneficial effects:

[0164] By adopting the method of injecting glue at the connection of the first penetrator housing and the second penetrator housing, there is no need to drill holes in the penetrator housing, saving processing steps. After filling the gap between the steps of the first penetrator housing and the steps of the second penetrator housing with the injection glue, the connection of the penetrator housing is carried out, further ensuring the sealing performance of the fiber optic penetrator.

[0165] Embodiment III

[0166] Reference Figure 10 , this embodiment provides a fiber optic penetrator for an oil-immersed transformer adopting the above manufacturing method, which includes a first penetrator housing 3, a second penetrator housing 4 and an optical fiber jumper 5. The optical fiber jumper 5 is shaped into a preset shape through a pre-designed mold. The optical fiber jumper 5 is connected inside the first penetrator housing 3 and the second penetrator housing 4. The first penetrator housing 3 and the second penetrator housing 4 are filled with injection glue, and the first penetrator housing 3 and the second penetrator housing 4 are fixedly connected.

[0167] Furthermore, the first penetrator housing 3 and the second penetrator housing 4 are hollow cylindrical structures, and one end is formed with an opening, and the other end is formed with a connection hole 6. And a step 7 extends from the end with the opening. A first screw hole 8 for housing connection and a second screw hole for adapter plate connection are formed on the step 7.

[0168] Furthermore, the optical fiber jumper 5 includes an optical fiber main body 51 and a first connector 52 and a second connector 53 respectively arranged at both ends of the optical fiber main body. The optical fiber main body 51 sequentially includes a core, a cladding, a coating layer and a sheath from inside to outside.

[0169] Furthermore, the shape of the optical fiber main body 51 is wavy.

[0170] Furthermore, the first connector 52 at one end of the optical fiber jumper 5 is connected to the connection hole 6 of the first penetrator housing 3 through a matching first flange 9; the second connector 53 at the other end of the optical fiber jumper 5 is connected to the connection hole 6 of the second penetrator housing 4 through a matching second flange 10.

[0171] Furthermore, the first flange 9 and the second flange 10 are potted with silicone. The injection glue in the first penetrator housing 3 and the second penetrator housing 4 is epoxy resin.

[0172] Furthermore, a perfusion hole is formed on the first penetrator housing 3 or the second penetrator housing 4. Specifically, in actual use, a perfusion hole is formed on the penetrator housing located outside the oil-immersed transformer.

[0173] Furthermore, the first penetrator housing 3 and the second penetrator housing 4 are connected through the first screw hole and a matching bolt 11.

[0174] Furthermore, a sealing groove is provided on the step of the first penetrator housing 3 or the second penetrator housing 4. Specifically, a sealing groove is provided on the step of the penetrator housing located inside the oil-immersed transformer for placing a sealing ring when connecting to the adapter plate to achieve a sealed connection with the adapter plate.

[0175] The optical fiber penetrator provided in this embodiment has at least the following beneficial effects:

[0176] (1) The penetrator housing with a cylindrical structure is used. Based on the screw holes on the steps at the connection of the two penetrator housings, its own connection and subsequent connection with the adapter plate are carried out. Compared with the traditional threaded penetrator, when connecting to the adapter plate, there is no need to use high-temperature and oil-resistant glue for curing, avoiding the risk of leakage of transformer oil caused by the aging of the glue during long-term use, and improving the reliability of the long-term use of the optical fiber penetrator;

[0177] (2) The optical fiber jumper is used instead of the traditional ceramic ferrule solution. It only needs to be aligned with the external optical fiber equipment through the flanges at both ends of the optical fiber penetrator. There is no longer a core alignment structure inside the optical fiber penetrator, avoiding the problem that the core alignment structure inside the optical fiber penetrator is damaged due to the vibration of the transformer during long-term operation in the transformer oil tank, and avoiding an increase in optical loss;

[0178] (3) The inside of the optical fiber penetrator is filled with glue, and epoxy resin is filled to ensure the sealing performance of the optical fiber penetrator to the greatest extent. It can not only prevent transformer oil from entering the inside of the optical fiber penetrator, but also enable the optical fiber penetrator to withstand higher oil pressure;

[0179] (4) The optical fiber body of the optical fiber jumper is pre-shaped into a wavy shape, which can avoid excessive extrusion of the optical fiber jumper during the condensation and curing of the poured epoxy resin, thereby increasing optical loss

[0180] Embodiment 4

[0181] In this embodiment, an assembly method of an optical fiber penetrator for an oil-immersed transformer obtained by using the above manufacturing method is provided, including:

[0182] Fixing and connecting the optical fiber penetrator to the adapter plate through bolts and sealing rings;

[0183] Connecting the adapter plate installed with the optical fiber penetrator to the oil-immersed transformer.

[0184] Specifically, in the above embodiment, during the process of manufacturing the first penetrator housing and the second penetrator housing, after the stepped portions are respectively extended from the open ends of the first cylindrical member and the second cylindrical member, it further includes:

[0185] Processing a sealing groove on the step of the first cylindrical member or the second cylindrical member.

[0186] Specifically, in actual use, a sealing groove needs to be machined on the step of the penetrator housing that needs to extend into the oil-immersed transformer. For example, assuming that the second penetrator housing needs to extend into the oil-immersed transformer, a sealing groove is provided on the step of the second penetrator housing.

[0187] Second screw holes for connecting the adapter plate are machined on the steps of the first penetrator housing and the second penetrator housing, and mounting holes and screw holes are provided on the adapter plate.

[0188] The fiber optic penetrator is fixedly connected to the adapter plate through bolts and sealing rings, including:

[0189] Place the sealing ring in the sealing groove, and install the fiber optic penetrator in the mounting hole of the adapter plate through adaptation and bolts to the second screw hole.

[0190] Furthermore, the end of the second flange on the second penetrator housing is flush with the upper part of the inner wall of the oil-immersed transformer.

[0191] The assembly method of the fiber optic penetrator for an oil-immersed transformer provided in this embodiment has at least the following beneficial effects:

[0192] (1) The fiber optic penetrator adopts a fixing method with a sealing ring and bolts, which not only ensures the sealing performance. Even during long-term operation under the vibration condition of the transformer, if the screws become loose, only the screws need to be tightened, which is convenient for equipment operation inspection and secondary reinforcement of the seal, and has higher long-term reliability;

[0193] (2) The end of the flange on the penetrator housing located in the oil-immersed transformer is flush with the upper part of the inner wall of the oil-immersed transformer, avoiding the risk of tip discharge and avoiding interference with the monitoring of fiber optic sensors, especially ultrasonic sensors.

[0194] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A manufacturing method of an optical fiber penetrator for an oil-immersed transformer, characterized in that, include: Manufacturing and forming a first through-hole housing and a second through-hole housing; Manufacturing and forming optical fiber jumpers; Placing the optical fiber body of the optical fiber jumper into a pre-designed mold for shaping to obtain an optical fiber body of a preset shape; Placing the optical fiber jumper into the first through-hole housing and the second through-hole housing to connect the first through-hole housing and the second through-hole housing; The first through-hole housing and the second through-hole housing are glue-filled and fixedly connected to obtain the optical fiber through-hole.

2. The method according to claim 1, wherein Manufacturing a first through-hole housing and a second through-hole housing, comprising: Stamping the metal part to form a first cylindrical part and a second cylindrical part which are open at one end and closed at the other end and are hollow; A step is extended from one end of the opening of the first cylindrical component and the second cylindrical component respectively, and a first screw hole for connecting to the housing and a second screw hole for connecting to the adapter plate are formed on the step; A connecting hole is formed at one closed end of the first cylindrical component or the second cylindrical component to obtain the first through-hole housing and the second through-hole housing.

3. The method according to claim 1, wherein Manufacturing of fiber optic patch cords, including: preparing a fiber core; Forming a cladding outside the core, wherein the refractive index of the cladding is lower than the refractive index of the core; forming a coating layer outside the cladding; Forming a sheath outside the coating layer to obtain an optical fiber body of the optical fiber jumper; Connectors are respectively installed at both ends of the optical fiber body to obtain the optical fiber jumper.

4. The method according to claim 3, wherein Connectors are installed at both ends of the optical fiber body to obtain the optical fiber jumper, including: Stripping off part of the sheath and coating at both ends of the optical fiber body to expose a fiber core with a cladding of a preset length; Insert a fiber core with a cladding of a preset length into the ferrule of the connector and align it in the center, and make the end of the fiber core with the cladding protrude from the ferrule of the connector; Fix the connector's ferrule with glue; The end of the fiber core with the cladding protruding from the ferrule of the connector is polished so that the end of the fiber core is flush with the ferrule of the connector.

5. The method according to claim 1, wherein The preset shape is a wave shape; Placing the optical fiber body of the optical fiber jumper into a pre-designed mold for shaping to obtain an optical fiber body of a preset shape, including: Placing the optical fiber body of the optical fiber jumper into a wavy mold, and leaving a gap between the optical fiber body and the inner wall of the mold; Filling the gap between the optical fiber body and the inner wall of the mold with glue and cooling it; The mold is removed to obtain a wavy optical fiber body.

6. The method according to claim 2, wherein Placing the optical fiber jumper into the first through-hole housing and the second through-hole housing to connect the first through-hole housing and the second through-hole housing, comprising: Connecting the first connector at one end of the optical fiber jumper to the connecting hole of the first through-hole housing through a matching first flange; The second connector at the other end of the optical fiber jumper is connected to the connecting hole of the second through-hole housing through a matching second flange.

7. The method according to claim 2, wherein After obtaining the first through-hole housing and the second through-hole housing, the method further includes: forming a perfusion hole on the first through-hole housing or the second through-hole housing; The first through-hole housing and the second through-hole housing are glued and fixedly connected to obtain the optical fiber through-hole, including: Connecting the first through-hole housing and the second through-hole housing by bolts matching the first screw holes; The potting glue is injected into the first through-hole shell and the second through-hole shell through the potting hole to obtain the optical fiber through-hole.

8. The method according to claim 2, wherein The first through-hole housing and the second through-hole housing are glued and fixedly connected to obtain the optical fiber through-hole, including: Injecting potting glue into the first and second vial shells from the connection between the first and second vial shells, and injecting potting glue into the gap between the step of the first vial shell and the step of the second vial shell; The first through-hole housing and the second through-hole housing are connected by bolts matched with the first screw holes to obtain the optical fiber through-hole.

9. An optical fiber penetrator for an oil-immersed transformer using the manufacturing method according to any one of claims 1-8, characterized in that, It includes a first through-device shell, a second through-device shell and an optical fiber jumper. The optical fiber jumper is shaped into a preset shape by a pre-designed mold. The optical fiber jumper is connected to the first through-device shell and the second through-device shell. The first through-device shell and the second through-device shell are poured with potting glue. The first through-device shell and the second through-device shell are fixedly connected.

10. An assembly method of an optical fiber penetrator for an oil-immersed transformer obtained by using the manufacturing method according to any one of claims 1-8, characterized in that, include: The optical fiber through-hole is fixedly connected to the adapter plate through bolts and a sealing ring; The adapter plate on which the optical fiber through-hole is installed is connected to the oil-immersed transformer.

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