Composite core insulator supporting column capable of being intelligently monitored and preparation method of composite core insulator supporting column

Abstract

The invention provides a composite core insulator supporting column capable of being intelligently monitored and a preparation method thereof. The composite core insulator supporting column capable of being intelligently monitored comprises a center composite core body layer, a middle composite core interlayer and an outer fiber composite material layer which are coaxially arranged and sequentially distributed from inside to outside. The middle composite core interlayer wraps the outer side of the central composite core body layer; the outer fiber composite material layer wraps the outer side of the middle composite core interlayer; a strain grating is implanted into the outer surface of the central composite core body layer; and the strain grating is electrically connected with a signal monitoring device arranged outside the composite core insulator pillar. According to the invention, the state of the insulator pillar can be monitored, so that the safety of the insulator pillar is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite post insulators for use in lines or stations, and specifically relates to a composite core insulator post capable of intelligent monitoring with a voltage level of 110 kV or above and a preparation method thereof. Background Art

[0002] As an important equipment for substations and transmission lines, composite insulators play an important role in the mechanical support and electrical insulation of disconnectors, tubular busbars, and flexible conductors. The tilting and breaking of porcelain post insulators during operation will cause partial or complete power outages in substations and transmission lines, and even personal injury and death, resulting in huge economic losses. Post insulators mainly include post porcelain insulators and composite post insulators. Compared with post porcelain insulators, composite insulator posts are light in weight, impact-resistant, and not easy to break, so they have been widely promoted and applied. Composite post insulators are mainly composed of core, silicone rubber shed, and hardware. They have high bending strength, good impact resistance, shock resistance, and anti-brittle fracture performance, and are light in weight and easy to install and maintain. Therefore, they are important components for supporting smoothing reactors, disconnectors, filter capacitors and other equipment and busbars.

[0003] Since the post composite insulator needs to withstand the combined loads of "tension, compression, bending and torsion", the corresponding operating conditions become more stringent with the increase of voltage level. The operating state of the composite post insulator, especially its internal state, has always been difficult to find and detect. When internal defects occur, its surface will not crack or explode like brittle materials such as ceramics and glass, and is therefore difficult to be found. However, the existing defects will directly affect its internal insulation and structural strength, causing serious safety accidents. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a composite core insulator support with intelligent monitoring and a preparation method thereof, which can realize the state monitoring of the insulator support and thus improve the safety of the insulator support.

[0005] The technical solution adopted by the present invention is: a composite core insulator support capable of intelligent monitoring, comprising a central composite core layer, an intermediate composite core sandwich layer and an outer fiber composite material layer coaxially arranged and distributed in sequence from the inside to the outside; the intermediate composite core sandwich layer is wrapped around the outside of the central composite core layer; the outer fiber composite material layer is wrapped around the outside of the intermediate composite core sandwich layer; a strain grating is implanted on the outer surface of the central composite core layer; the strain grating is electrically connected to a signal monitoring device arranged outside the composite core insulator support.

[0006] In the above technical solution, the strain grating includes a plurality of longitudinal strain gratings; the longitudinal strain gratings are evenly distributed on the outer surface of the central composite core layer, and the connecting line of the plurality of longitudinal strain gratings is perpendicular to the axis of the central composite core layer.

[0007] In the above technical solution, the strain grating includes multiple circumferential strain gratings; the circumferential strain gratings are evenly distributed on the outer surface of the central composite core layer, winding from the bottom of the central composite core layer along the circumferential direction of the central composite core layer to the top of the central composite core layer.

[0008] In the above technical solution, multiple longitudinal strain gratings are connected in series through a first optical fiber signal line; the first optical fiber signal line extends from between the central composite core layer and the middle composite core interlayer to the outside of the composite core insulator support; the first optical fiber signal line is electrically connected to the signal monitoring device through an external optical fiber signal line.

[0009] In the above technical solution, multiple annular strain gratings are connected in series through a second optical fiber signal line; the second optical fiber signal line extends from between the central composite core layer and the middle composite core interlayer to the outside of the composite core insulator support; the second optical fiber signal line is electrically connected to the signal monitoring device through an external optical fiber signal line.

[0010] In the above technical solution, the external optical fiber signal line single-line multi-core structure is electrically connected to the first optical fiber signal line and the second optical fiber signal line respectively.

[0011] In the above technical solution, the central composite core layer and the middle composite core interlayer are respectively a cylindrical structure and annular column structure of a composite material of polymer hollow microbeads and polymer resin, with a density of 0.3-0.6g / cm3, wherein the size of the polymer hollow microbeads is micro-nano level, and the added mass accounts for 1.0%-2.5% of the total mass.

[0012] In the above technical solution, the outer fiber composite material layer is an annular column structure using ECR glass fiber, basalt fiber and polyester fiber, and the resin is epoxy resin, vinyl resin, unsaturated resin, phenolic resin or nylon resin; the outer fiber composite material layer is formed by pultrusion, entanglement, or winding, or vacuum infiltration.

[0013] In the above technical solution, metal flanges are crimped at both ends of the composite core insulator support; the metal flange located at the low-voltage end of the composite core insulator support is provided with a mounting hole; the first optical fiber signal line and the second optical fiber signal line pass through the mounting hole and are electrically connected to the external optical fiber signal line; the mounting hole is sealed with a sealing structural adhesive.

[0014] In the above technical solution, a silicone rubber umbrella sleeve is provided on the outer surface of the composite core insulator support.

[0015] The present invention provides a method for preparing a composite core insulator support capable of intelligent monitoring, comprising the following steps:

[0016] Casting a rubber compound of polymer hollow microspheres and polymer resin, fixing and degassing, and thermally curing to form a central composite core layer;

[0017] A strain grating is fixed on the surface of the central composite core layer;

[0018] Placing a central composite core layer with a strain grating inside an outer fiber composite layer, and keeping the central composite core layer concentric with the outer fiber composite layer;

[0019] The polymer microbeads and the polymer resin are injected into the sandwich of the central composite core layer and the outer fiber composite material layer, fixed and defoamed, and thermally cured to form the middle composite core sandwich.

[0020] In the above technical solution, the process of encapsulating and fixing the strain grating on the surface of the central composite core layer includes the following steps: applying the encapsulated strain grating to the surface of the central composite core layer according to the designed points, and then covering the strain grating surface with the same material as the central composite core layer.

[0021] The above technical solution also includes the following steps: connecting the strain gratings in series through an optical fiber signal line and extending the optical fiber signal line to the outside of the composite core insulator support, and crimping metal flanges at both ends of the composite core insulator support;

[0022] A mounting hole is reserved in the metal flange at the low voltage end, and the optical fiber signal line is led out from the mounting hole and electrically connected to a signal monitoring device located outside the composite core insulator support;

[0023] After the optical fiber signal line is led out of the installation hole, it is sealed with sealing structural adhesive;

[0024] A silicone rubber umbrella sleeve is injected onto the outer surface of the composite core insulator support.

[0025] The beneficial effects of the present invention are as follows: the present invention implants a strain grating inside the composite core rod, which can collect the internal strain and temperature changes of the operating support insulator in real time, grasp the internal stress and operating status of the composite core, solve the problem of core rod operation and maintenance, and can promptly discover problems with key devices such as composite insulators to avoid major accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the present invention and a longitudinal optical fiber and strain grating distribution diagram:

[0027] Among them, 1-central composite core layer, 2-middle composite core sandwich layer, 3-outer fiber composite material layer, 4-1-first optical fiber signal line and 5-1-longitudinal strain grating;

[0028] Figure 2 The schematic diagram of the structure of the present invention and the distribution diagram of the annular optical fiber and the strain grating are as follows:

[0029] Among them, 4-2-second optical fiber signal line, 5-2-annular strain grating;

[0030] Figure 3 This is a schematic diagram of the external structure of the present invention:

[0031] Among them, 6-metal flange, 7-external optical fiber signal line, 8-signal monitoring device, 9-silicone rubber umbrella sleeve, 10-composite core insulator support. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0033] Example 1

[0034] like Figure 1-3 As shown, the present invention provides a composite core insulator support 10 capable of intelligent monitoring, comprising a central composite core layer 1, an intermediate composite core sandwich 2 and an outer fiber composite material layer 3 coaxially arranged and distributed in sequence from the inside to the outside; the intermediate composite core sandwich 2 is wrapped around the outside of the central composite core layer 1; the outer fiber composite material layer 3 is wrapped around the outside of the intermediate composite core sandwich 2; a strain grating is implanted on the outer surface of the central composite core layer 1; the strain grating is electrically connected to a signal monitoring device 8 arranged outside the composite core insulator support 10.

[0035] The signal monitoring device 8 transmits an optical signal to the strain grating through the optical fiber signal line, and receives the sensor signal transmitted back by the strain grating, and then processes the internal stress strain and local temperature parameters of the post insulator during operation to determine whether the composite core post insulator is operating normally.

[0036] like Figure 1 As shown, the strain grating includes a plurality of longitudinal strain gratings 5-1; the longitudinal strain gratings 5-1 are evenly distributed on the outer surface of the central composite core layer 1, and the connecting line of the plurality of longitudinal strain gratings 5-1 is perpendicular to the axis of the central composite core layer 1. The plurality of longitudinal strain gratings 5-1 are connected in series through the first optical fiber signal line 4-1; the first optical fiber signal line 4-1 extends from between the central composite core layer 1 and the intermediate composite core sandwich 2 to the outside of the composite core insulator support 10; the first optical fiber signal line 4-1 is electrically connected to the signal monitoring device 8 through the external optical fiber signal line 7. By implanting the longitudinal strain grating 5-1 on the surface of the central composite core layer 1, the longitudinal deformation and temperature of the surrounding of the central composite core layer 1 are monitored. All strain gratings are transmitted through optical fibers and introduced into the signal monitoring device 8 through the first optical fiber signal line 4-1 and the external optical fiber signal line 7.

[0037] like Figure 2As shown, the strain grating includes a plurality of circumferential strain gratings 5-2; the circumferential strain gratings 5-2 are evenly distributed on the outer surface of the central composite core layer 1, and are wound from the bottom of the central composite core layer 1 along the circumferential direction of the central composite core layer 1 to the top of the central composite core layer 1. The plurality of circumferential strain gratings 5-2 are connected in series through the second optical fiber signal line 4-2; the second optical fiber signal line 4-2 extends from between the central composite core layer 1 and the intermediate composite core sandwich 2 to the outside of the composite core insulator support 10; the second optical fiber signal line 4-2 is electrically connected to the signal monitoring device 8 through the external optical fiber signal line 7. The circumferential strain grating 5-2 is also implanted on the lower end of the surface of the central composite core layer 1 along the circumferential direction to monitor the circumferential timely deformation and temperature of the central composite core layer 1, and is introduced into the signal monitoring device 8 through the second optical fiber signal line 4-2 and the external optical fiber signal line 7 to collect and record the strain and temperature information of the corresponding composite core.

[0038] The present invention can monitor the longitudinal and circumferential strain conditions inside the composite core post insulator in real time, and can also monitor the temperature around the corresponding grating points in real time, reflecting the internal stress and heating conditions of the post insulator, so as to monitor the operating state parameters of the post insulator, record the operating state of the insulator at all times, and ensure the safe operation of the post insulator.

[0039] Preferably, the external optical fiber signal line 7 has a single-line multi-core structure and is electrically connected to the first optical fiber signal line 4 - 1 and the second optical fiber signal line 4 - 2 , respectively, to effectively ensure signal transmission.

[0040] Specifically, the central composite core layer 1 and the intermediate composite core sandwich layer 2 are cylindrical and annular cylindrical structures respectively made of composite materials of polymer hollow microspheres and polymer resin, with a density of 0.3-0.6 g / cm 3 The size of the polymer hollow microbeads is micro-nano level, and the added mass accounts for 1.0%-2.5% of the total mass. The internal insulation of the composite core rod is improved by it, while the mass of the core rod is reduced to achieve the overall lightweight of the insulator. Compared with solid rods, it solves the problem of heavy weight of large-size composite cores and improves the convenience in design, manufacturing, transportation, construction, operation and maintenance.

[0041] The composite material of the polymer hollow microspheres and the polymer resin is the same existing material as the resin and microsphere composite material cylinder in the patent application "CN114834077A-Lightweight Insulation Composite Core Rod and Preparation Method Thereof".

[0042] Specifically, the outer fiber composite material layer 3 is an annular column structure made of ECR ​​glass fiber, basalt fiber and polyester fiber, and the resin is epoxy resin, vinyl resin, unsaturated resin, phenolic resin or nylon resin; the outer fiber composite material layer 3 is formed by pultrusion, entanglement, or winding, or vacuum infiltration.

[0043] The core rod of the present invention adopts a three-layer structure, and the internal composite core body adopts a density of 0.3-0.6g / cm 3 The density of the composite material of polymer hollow microspheres and epoxy resin is 1 / 3-1 / 7 of that of glass fiber reinforced plastics, which can effectively reduce the weight of the composite core rod. Compared with solid rods, it can solve the technical problems of large-size composite cores with large weight, transportation and construction difficulties. The outer fiber composite material layer 3 has good insulation performance, high and low temperature resistance, and stress corrosion resistance, and can effectively protect the inner structure.

[0044] In this embodiment, the entire composite core insulator support 10 is 5500 mm high, the diameter of the composite core insulator support 10 is 220 mm, the diameter of the central composite core layer 1 in the corresponding three-layer structure is 130 mm, the thickness of the middle composite core sandwich 2 is 25 mm, and the thickness of the outer fiber composite material layer 3 is 20 mm. Six strain gratings ( Figure 1 ), the upper and lower strain gratings are arranged at the two ends of the central composite core layer 1 as much as possible, and the other 4 are evenly distributed; 9 strain gratings are arranged circumferentially at the interface between the central composite core layer 1 and the middle composite core sandwich 2 ( Figure 2 ), and the circumferential spiral is evenly distributed. By evenly arranging the strain grating, the internal state parameters of the composite core insulator can be collected in an all-round way to ensure the validity of the monitoring data.

[0045] Specifically, the metal flanges 6 are crimped at both ends of the composite core insulator support 10; the metal flange 6 at the low-voltage end of the composite core insulator support 10 is provided with a mounting hole; the aperture of the mounting hole is less than 1 cm; the first optical fiber signal line 4-1 and the second optical fiber signal line 4-2 pass through the mounting hole and are electrically connected to the external optical fiber signal line 7; the mounting hole is sealed with a sealing structural adhesive. A silicone rubber umbrella sleeve 9 is provided on the outer surface of the composite core insulator support 10. The present invention ensures the overall safety of the composite core insulator support 10 while ensuring the effective transmission of the monitoring signal by reasonably arranging the lead-out signal line of the strain grating.

[0046] Example 2

[0047] The present invention provides a method for preparing a composite core insulator support 10 capable of intelligent monitoring, comprising the following steps:

[0048] In the first step, a mold is used to cast a rubber material of polymer hollow microspheres and polymer resin according to the designed size, fix and degas, and thermally cure to prepare a central composite core layer 1.

[0049] In the second step, the packaged strain grating is applied to the surface of the central composite core layer 1 according to the designed points, and then the surface of the strain grating is covered with the same material as the central composite core layer 1. The strain grating is connected in series through the optical fiber signal line and the optical fiber signal line is extended to the outside of the composite core insulator pillar 10 to ensure that the strain grating can have effective contact with the inside of the insulator pillar, thereby accurately monitoring the deformation and temperature state inside the insulator.

[0050] The third step is to make the outer fiber composite material layer 3 according to the designed size; place the central composite core layer 1 with the strain grating in the outer fiber composite material layer 3, and keep the central composite core layer 1 concentric with the outer fiber composite material layer 3; wherein the outer fiber composite material layer 3 can be formed by pultrusion, entanglement, winding, or vacuum infusion.

[0051] The fourth step is to inject a sizing material of polymer microbeads and polymer resin (i.e., polymer microbeads and epoxy resin) into the sandwich between the central composite core layer 1 and the outer fiber composite material layer 3, fix and degas, pre-cure at 80°C for 2h, and post-cure at 130°C for 3h. The thickness of the cured composite core sandwich does not exceed 3cm, forming the middle composite core sandwich 2. The present invention provides a method of injecting a sizing material of polymer microbeads and polymer resin into the sandwich between the central composite core layer 1 and the outer fiber composite material layer 3 to form the middle composite core sandwich 2, ensuring that the three-layer structure can form a stable integrated structure and ensuring the overall performance of the insulator is stable.

[0052] In the fifth step, the metal flanges 6 are crimped at both ends of the composite core insulator support 10; a mounting hole is reserved at the metal flange 6 at the low-voltage end, and the optical fiber signal line is led out from the mounting hole and electrically connected to the signal monitoring device 8 located outside the composite core insulator support 10; after the optical fiber signal line is led out of the mounting hole, it is sealed with a sealing structural adhesive; and a silicone rubber umbrella cover 9 is injected on the outer surface of the composite core insulator support 10.

[0053] The composite core insulator support 10 capable of intelligent monitoring manufactured by the present invention does not contain conductive impurities and bubbles that affect the insulation performance of the core, will not form local discharge inside the core, accelerate the aging time of the core, and further affect the mechanical strength of the core, and can withstand the erosion of adverse climatic conditions such as sunlight, rain, wind and sand, high temperature and severe cold, and has good insulation performance, high and low temperature resistance, and stress corrosion resistance; it can also timely monitor the longitudinal and circumferential strains inside the support insulator and the temperature conditions at different points inside, and judge the stress conditions and internal heating conditions inside the support insulator in operation through the strains and temperatures of different points inside.

[0054] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A composite core insulator support capable of intelligent monitoring, characterized in that: It comprises a central composite core layer, an intermediate composite core sandwich layer and an outer fiber composite material layer which are coaxially arranged and distributed in sequence from the inside to the outside; the intermediate composite core sandwich layer is wrapped around the outside of the central composite core layer; the outer fiber composite material layer is wrapped around the outside of the intermediate composite core sandwich layer; a strain grating is implanted on the outer surface of the central composite core layer; the strain grating is electrically connected to a signal monitoring device arranged outside the composite core insulator support.

2. The composite core insulator support capable of intelligent monitoring according to claim 1, characterized in that: The strain grating includes a plurality of longitudinal strain gratings; the longitudinal strain gratings are evenly distributed on the outer surface of the central composite core layer, and the connecting line of the plurality of longitudinal strain gratings is perpendicular to the axis of the central composite core layer.

3. The composite core insulator support capable of intelligent monitoring according to claim 2, characterized in that: The strain grating includes a plurality of circumferential strain gratings; the circumferential strain gratings are evenly distributed on the outer surface of the central composite core layer, and are wound from the bottom of the central composite core layer along the circumferential direction of the central composite core layer to the top of the central composite core layer.

4. The composite core insulator support capable of intelligent monitoring according to claim 3, characterized in that: A plurality of longitudinal strain gratings are connected in series via a first optical fiber signal line; the first optical fiber signal line extends from between the central composite core layer and the middle composite core sandwich layer to the outside of the composite core insulator support; The first optical fiber signal line is electrically connected to the signal monitoring device through an external optical fiber signal line.

5. The composite core insulator support capable of intelligent monitoring according to claim 4, characterized in that: A plurality of annular strain gratings are connected in series via a second optical fiber signal line; the second optical fiber signal line extends from between the central composite core layer and the middle composite core sandwich to the outside of the composite core insulator support; the second optical fiber signal line is electrically connected to the signal monitoring device via an external optical fiber signal line.

6. The composite core insulator support capable of intelligent monitoring according to claim 5, characterized in that: The external optical fiber signal line single-line multi-core structure is electrically connected to the first optical fiber signal line and the second optical fiber signal line respectively.

7. The composite core insulator support capable of intelligent monitoring according to claim 1, characterized in that: The central composite core layer and the middle composite core sandwich are cylindrical and annular cylindrical structures respectively made of composite materials of polymer hollow microspheres and polymer resin, with a density of 0.3-0.6g / cm 3 , wherein the size of the polymer hollow microbeads is micro-nanoscale, and the added mass accounts for 1.0%-2.5% of the total mass.

8. The composite core insulator support capable of intelligent monitoring according to claim 1, characterized in that: The outer fiber composite material layer is an annular column structure made of ECR ​​glass fiber, basalt fiber and polyester fiber, and the resin is epoxy resin, vinyl resin, unsaturated resin, phenolic resin or nylon resin; the outer fiber composite material layer is formed by pultrusion, entanglement, or winding, or vacuum infiltration.

9. The composite core insulator support capable of intelligent monitoring according to claim 5, characterized in that: Metal flanges are crimped at both ends of the composite core insulator support; the metal flange located at the low-voltage end of the composite core insulator support is provided with a mounting hole; the first optical fiber signal line and the second optical fiber signal line pass through the mounting hole and are electrically connected to the external optical fiber signal line; the mounting hole is sealed with a sealing structural adhesive.

10. The composite core insulator support capable of intelligent monitoring according to claim 8, characterized in that: The outer surface of the composite core insulator support is provided with a silicone rubber umbrella sleeve.

11. A method for preparing the composite core insulator support capable of intelligent monitoring according to claim 1, characterized in that: The following steps are involved: Casting a rubber compound of polymer hollow microspheres and polymer resin, fixing and degassing, and thermally curing to form a central composite core layer; A strain grating is fixed on the surface of the central composite core layer; Placing a central composite core layer with a strain grating inside an outer fiber composite layer, and keeping the central composite core layer concentric with the outer fiber composite layer; The polymer microbeads and the polymer resin are injected into the sandwich of the central composite core layer and the outer fiber composite material layer, fixed and defoamed, and thermally cured to form the middle composite core sandwich.

12. The method for preparing a composite core insulator support capable of intelligent monitoring according to claim 11, characterized in that: The process of packaging and fixing the strain grating on the surface of the central composite core layer includes the following steps: applying the packaged strain grating to the surface of the central composite core layer according to the designed points, and then covering the strain grating surface with the same material as the central composite core layer.

13. The method for preparing a composite core insulator support capable of intelligent monitoring according to claim 11, characterized in that: The following steps are also included: The strain gratings are connected in series through optical fiber signal lines and the optical fiber signal lines are extended to the outside of the composite core insulator pillars, and metal flanges are crimped at both ends of the composite core insulator pillars; A mounting hole is reserved in the metal flange at the low voltage end, and the optical fiber signal line is led out from the mounting hole and electrically connected to a signal monitoring device located outside the composite core insulator support; After the optical fiber signal line is led out of the installation hole, it is sealed with sealing structural adhesive; A silicone rubber umbrella sleeve is injected onto the outer surface of the composite core insulator support.

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