Composite core insulator pillar capable of intelligent monitoring

Abstract

The utility model provides a composite core insulator pillar capable of intelligent monitoring. The composite core insulator pillar comprises a central 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 utility model, the state of the insulator pillar can be monitored, so that the safety of the insulator pillar is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of composite post insulator for line or station, concretely relates to a composite core insulator post with 110kV and above voltage grade and intelligent monitoring function. BACKGROUND

[0002] As an important equipment of transformer substation and transmission line, post composite insulator plays an important role in mechanical support and electrical insulation of disconnecting switch, tubular bus and flexible conductor. In operation, the inclination and fracture of porcelain post insulator will cause partial or total power failure of transformer substation and transmission line, even personal injury and huge economic loss. Post insulator mainly includes post porcelain insulator and composite post insulator. Compared with post porcelain insulator, composite post insulator is light in weight, resistant to impact and not easy to break, and thus is widely applied. Composite post insulator is mainly composed of core body, silicone rubber umbrella skirt and fittings, has high bending strength, good impact resistance, shock resistance and brittle fracture resistance, and is light in weight and convenient to install and maintain, and thus is used as an important component of devices such as support flat wave reactor, disconnecting switch, filter capacitor and bus.

[0003] Since post composite insulator needs to bear combined load of tension, compression, bending and torsion, its operation condition becomes more and more severe with the increase of voltage grade. However, the operation state of composite post insulator, especially its internal state, is difficult to find and detect. When internal defects occur, the surface of composite post insulator will not break or explode like brittle materials such as porcelain and glass, and thus is difficult to be found. However, the existing defects will directly affect the internal insulation and structural strength of composite post insulator, and cause serious safety accidents. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the problems in the prior art, and provides a composite core insulator post with intelligent monitoring function, which can monitor the state of insulator post and improve the safety of insulator post.

[0005] The utility model adopts the technical scheme of a composite core insulator post with intelligent monitoring function, which comprises coaxially arranged center composite core layer, intermediate composite core layer and outer fiber composite material layer distributed in sequence from inside to outside; the intermediate composite core layer is wrapped on the outside of the center composite core layer; the outer fiber composite material layer is wrapped on the outside of the intermediate composite core layer; strain gratings are implanted on the outer surface of the center composite core layer; and the strain gratings are electrically connected with a signal monitoring device arranged outside the composite core insulator post.

[0006] In the above technical scheme, the strain gratings comprise a plurality of longitudinal strain gratings; the longitudinal strain gratings are uniformly distributed on the outer surface of the center composite core layer, and the connecting lines of the plurality of longitudinal strain gratings are perpendicular to the axis of the center composite core layer.

[0007] In the technical scheme, the strain grating comprises a plurality of annular strain gratings; the annular strain gratings are uniformly distributed on the outer surface of the central composite core layer and are wound from the bottom of the central composite core layer to the top of the central composite core layer along the annular direction of the central composite core layer.

[0008] In the technical scheme, the plurality of longitudinal strain gratings are connected in series with each other through the first optical fiber signal line; the first optical fiber signal line extends from between the central composite core layer and the intermediate composite core interlayer to the outside of the composite core insulator support; and the first optical fiber signal line is electrically connected with the signal monitoring device through the external optical fiber signal line.

[0009] In the technical scheme, the plurality of annular strain gratings are connected in series with each other through the second optical fiber signal line; the second optical fiber signal line extends from between the central composite core layer and the intermediate composite core interlayer to the outside of the composite core insulator support; and the second optical fiber signal line is electrically connected with the signal monitoring device through the external optical fiber signal line.

[0010] In the technical scheme, the external optical fiber signal line has a single-wire multi-core structure and is electrically connected with the first optical fiber signal line and the second optical fiber signal line respectively.

[0011] In the technical scheme, the central composite core layer and the intermediate composite core interlayer are respectively a cylindrical structure and an annular column structure of a composite material of polymer hollow microbeads and polymer resin, and have a density of 0.3-0.6 g / cm3; the polymer hollow microbeads have a size of micro-nanometer level and are added in a mass fraction of 1.0%-2.5% of the total mass.

[0012] In the technical scheme, the outer fiber composite material layer has an annular column structure of ECR glass fiber, basalt fiber and polyester fiber, and a resin of epoxy resin, vinyl resin, unsaturated resin, phenolic resin or nylon resin; the outer fiber composite material layer is formed by pultrusion, pultrusion process, winding or vacuum impregnation.

[0013] In the technical scheme, the composite core insulator support is provided with metal flanges at both ends; the metal flange 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 out of the mounting hole and are electrically connected with the external optical fiber signal line; and the mounting hole is sealed by sealing structure glue.

[0014] In the technical scheme, the outer surface of the composite core insulator support is provided with a silicone rubber umbrella cover.

[0015] The preparation method of the composite core insulator support capable of intelligent monitoring provided by the utility model comprises the following steps:

[0016] The material of the center composite core layer is used to cover the surface of the strain grating, and the strain grating is fixed on the surface of the center composite core layer.

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

[0018] The center composite core layer with the strain grating is arranged in the outer layer fiber composite material layer, and the center composite core layer is kept concentric with the outer layer fiber composite material layer;

[0019] The material of polymer microbeads and polymer resin is injected into the interlayer of the center composite core layer and the outer layer fiber composite material layer, and is fixed, defoamed and heat-cured to form an intermediate composite core interlayer.

[0020] In the technical scheme, the process of packaging and fixing the strain grating on the surface of the center composite core layer comprises the following steps: the packaged strain grating is attached to the surface of the center composite core layer according to a design point, and the same material as that of the center composite core layer is used to cover the surface of the strain grating.

[0021] The technical scheme further comprises the following steps: the strain gratings are connected in series through the optical fiber signal lines, and the optical fiber signal lines are extended to the outside of the composite core insulator support, and the metal flanges are crimped at both ends of the composite core insulator support;

[0022] The metal flange at the low-voltage end is provided with a mounting hole, the optical fiber signal line is led out from the mounting hole and electrically connected with the signal monitoring device outside the composite core insulator support;

[0023] The optical fiber signal line led out from the mounting hole is sealed with sealing structure glue;

[0024] Silicone rubber umbrella sleeves are injected on the outer surface of the composite core insulator support.

[0025] The utility model discloses the beneficial effects are: the utility model discloses the strain grating is implanted in the composite core rod, can collect the internal strain and temperature change of the operation support insulator in real time, grasps the stress and operation state in the composite core body, solves the core rod operation and maintenance problem, can find the key device problem such as composite insulator in time, avoids the major accident to occur. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is structure schematic drawing and longitudinal optical fiber and strain grating distribution drawing for the utility model:

[0027] 1 - center composite core layer, 2 - intermediate composite core interlayer, 3 - outer layer fiber composite material layer, 4 - 1 - first optical fiber signal line and 5 - 1 - longitudinal strain grating;

[0028] Figure 2 It is structure schematic drawing and ring optical fiber and strain grating distribution drawing for the utility model:

[0029] Wherein, 4-2- second optical fiber signal line, 5-2- ring strain grating;

[0030] Figure 3 It is the external structure schematic diagram of the utility model:

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

[0032] The utility model will be further explained in detail in combination with the drawings and specific embodiments, for clearly understanding the utility model, but they do not constitute the limitation of the utility model.

[0033] Example 1

[0034] As Figures 1-3 The utility model provides a composite core insulator support 10 of intelligent monitoring, including coaxial arrangement by inside to outside distribution's center composite core layer 1, intermediate composite core interlayer 2 and outer layer fiber composite material layer 3, intermediate composite core interlayer 2 is wrapped in center composite core layer 1 outside, outer layer fiber composite material layer 3 is wrapped in intermediate composite core interlayer 2 outside, and the center composite core layer 1 outer surface is implanted with strain grating, the strain grating is electrically connected with the signal monitoring device 8 arranged in the composite core insulator support 10 outside.

[0035] Signal monitoring device 8 emits optical signal to strain grating through optical fiber signal line, and receives the sensing signal that strain grating returns, and then handles the stress strain and local temperature parameters in the process of obtaining operation inside support insulator, to judge whether the inside composite core support insulator is normal in operation in this way.Signal processing method program configured in signal monitoring device 8 does not belong to the shell that the present application claims protection.For signal monitoring device, the present application only requires protection the electric connection mode of signal monitoring device and strain grating, to achieve the technical purpose of gathering the internal state information of insulator, how to judge the internal state of insulator is not the technical purpose of the present application.

[0036] As Figure 1As shown, the strain grating includes a plurality of longitudinal strain gratings 5-1; the longitudinal strain gratings 5-1 are uniformly 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 with each other 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 interlayer 2 to the outside of the composite core insulator support 10; and the first optical fiber signal line 4-1 is electrically connected with the signal monitoring device 8 through the external optical fiber signal line 7. The longitudinal strain grating 5-1 is implanted on the surface of the central composite core layer 1 to monitor the timely deformation and temperature of the surrounding longitudinal body of the central composite core layer 1; all the strain gratings are conducted downward through the optical fiber, and are 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] As shown in the figure, Figure 2 As shown, the strain grating includes a plurality of longitudinal strain gratings 5-1; the longitudinal strain gratings 5-1 are uniformly 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 with each other 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 interlayer 2 to the outside of the composite core insulator support 10; and the first optical fiber signal line 4-1 is electrically connected with the signal monitoring device 8 through the external optical fiber signal line 7. The longitudinal strain grating 5-1 is implanted on the surface of the central composite core layer 1 to monitor the timely deformation and temperature of the surrounding longitudinal body of the central composite core layer 1; all the strain gratings are conducted downward through the optical fiber, and are introduced into the signal monitoring device 8 through the first optical fiber signal line 4-1 and the external optical fiber signal line 7.

[0038] The utility model can monitor the strain condition of longitudinal and annular inside of composite core support insulator in real time, can also monitor the temperature around corresponding grating distribution in real time, reflects the stress and heating condition inside support insulator, is used to monitor support insulator operation state parameter, records the operation state of insulator at all times, ensures the operation safety of support insulator

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

[0040] Specifically, the central composite core layer 1 and the intermediate composite core interlayer 2 are respectively cylindrical structure and annular column structure of composite material adopting polymer hollow microbead and polymer resin, and the density is 0.3-0.6g / cm 3The size of the polymer hollow microbead is micro-nano level, the added mass accounts for 1.0%-2.5% of the total mass, the inner insulation of the composite core rod is improved, the mass of the core rod is reduced, the overall light weight of the insulator is realized, the problem of large size composite core weight is solved compared with the solid rod, and the convenience in design, manufacture, transportation, construction, operation and maintenance is improved.

[0041] The composite material of the polymer hollow microbead and the polymer resin adopts the same existing material of the resin and the microbead composite material cylinder in the patent application CN114834077A-light weight insulation composite core rod and preparation method thereof.

[0042] Specifically, the outer fiber composite layer 3 is an annular column structure adopting 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 layer 3 is formed by pultrusion, winding process, winding forming or vacuum impregnation forming.

[0043] The core rod adopts a three-layer structure, and the internal composite core body adopts a density of 0.3-0.6 g / cm 3 The polymer hollow microbead and the epoxy resin composite material have a density of 1 / 3-1 / 7 of the density of the glass fiber reinforced plastic material, can effectively reduce the mass of the composite core rod, solve the technical problems of large size composite core weight, transportation and construction difficulty compared with the solid rod, and the outer fiber composite layer 3 has good insulation performance, high and low temperature resistance and stress corrosion resistance, and can effectively protect the inner layer structure.

[0044] In the embodiment, the whole composite core insulator pillar 10 is 5500mm high, the diameter of the composite core insulator pillar 10 is 220mm, the diameter of the center composite core layer 1 in the three-layer structure is 130mm, the thickness of the intermediate composite core layer 2 is 25mm, and the thickness of the outer fiber composite layer 3 is 20mm. Figure 1 The strain gratings are arranged as much as possible at both ends of the center composite core layer 1, and the other four strain gratings are uniformly distributed; nine strain gratings are arranged in a ring direction at the interface between the center composite core layer 1 and the intermediate composite core layer 2. Figure 2 Through the uniform arrangement of the strain gratings, the internal state parameters of the composite core insulator can be collected in all directions, and the effectiveness of the monitoring data is ensured.

[0045] Specifically, the composite core insulator post 10 is crimped with metal flanges 6 at both ends; the metal flange 6 at the low-voltage end of the composite core insulator post 10 is provided with a mounting hole; the mounting hole has a diameter 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 with the external optical fiber signal line 7; and the mounting hole is sealed with sealing structure glue. The outer surface of the composite core insulator post 10 is provided with a silicone rubber umbrella 9. The utility model rationally arranges the leading signal lines of the strain grating, ensures the effective transmission of the monitoring signal, and ensures the overall safety of the composite core insulator post 10.

[0046] Embodiment 2

[0047] The utility model provides a kind of preparation method of composite core insulator post 10 of intelligent monitoring, comprising the following steps:

[0048] First, using mould, according to the size of design, the glue of polymeric hollow microsphere and polymer resin is poured, fixed debubbling, and heat curing preparation forms center composite core layer 1.

[0049] Second, encapsulated strain grating is pasted on the surface of center composite core layer 1 according to design point, then the same material as center composite core layer 1 is covered on the surface of strain grating, strain grating is connected by optical fiber signal line and makes optical fiber signal line extend to the outside of composite core insulator post 10, to ensure that strain grating can effectively contact with the inside of insulator post, so that the deformation and temperature state in the inside of insulator are accurately monitored.

[0050] Third, outer layer fiber composite material layer 3 is made according to the size of design;Center composite core layer 1 with strain grating is placed in outer layer fiber composite material layer 3, and center composite core layer 1 and outer layer fiber composite material layer 3 are kept concentric;Wherein, outer layer fiber composite material layer 3 can be formed by pultrusion, pull winding process, or can be formed by winding or vacuum impregnation.

[0051] Fourth, the glue of polymeric microbead and polymer resin (i.e. polymeric microbead and epoxy resin) is injected into the interlayer of center composite core layer 1 and outer layer fiber composite material layer 3, fixed debubbling, pre-cured at 80 DEG C for 2h, post-cured at 130 DEG C for 3h, and the thickness of cured composite core interlayer is not more than 3cm, to form intermediate composite core interlayer 2. The utility model provides the way of injecting the glue of polymeric microbead and polymer resin into the interlayer of center composite core layer 1 and outer layer fiber composite material layer 3 to form intermediate composite core interlayer 2, to ensure that three-layer structure can form stable integrated structure, and ensure the overall performance stability of insulator.

[0052] In the fifth step, the composite core insulator post 10 is crimped with metal flanges 6 at both ends; the metal flange 6 at the low-voltage end is provided with a mounting hole, and the optical fiber signal line is led out from the mounting hole and electrically connected to the signal monitoring device 8 outside the composite core insulator post 10; the optical fiber signal line led out from the mounting hole is sealed with sealing structure glue; and the silicon rubber umbrella 9 is injected on the outer surface of the composite core insulator post 10.

[0053] The composite core insulator post 10 manufactured by the utility model can be intelligently monitored, does not have conductive impurities and bubbles to affect the insulation performance of the core body, does not form local discharge in the core body, does not accelerate the aging time of the core body, and thus does not affect the mechanical strength of the core body, can withstand erosion of adverse weather conditions such as sunshine, rain, wind and sand, high temperature and severe cold, has good insulation performance, high and low temperature resistance and stress corrosion resistance; and can timely monitor the longitudinal and circumferential strain and the temperature conditions of different internal points of the post insulator, and judge the stress conditions and internal heating conditions in the post insulator in operation through the strain and temperature of the internal points.

[0054] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A smartly monitorable composite core insulator post, characterized by: The composite core insulator post comprises a coaxial arrangement of a central composite core layer, an intermediate composite core layer and an outer fiber composite material layer arranged from inside to outside; the intermediate composite core layer is wrapped outside the central composite core layer; the outer fiber composite material layer is wrapped outside the intermediate composite core layer; a strain grating is implanted on the outer surface of the central composite core layer; the strain grating is electrically connected with a signal monitoring device arranged outside the composite core insulator post.

2. The composite core insulator post of claim 1, wherein: The strain grating comprises a plurality of longitudinal strain gratings; the longitudinal strain gratings are uniformly distributed on the outer surface of the central composite core layer, and the connecting lines of the longitudinal strain gratings are perpendicular to the axis of the central composite core layer.

3. The smartly monitorable composite core insulator post according to claim 2, wherein: The strain grating comprises a plurality of annular strain gratings; the annular strain gratings are uniformly distributed on the outer surface of the central composite core layer, and are wound from the bottom of the central composite core layer to the top of the central composite core layer along the annular direction of the central composite core layer.

4. The composite core insulator post of claim 3, wherein: The longitudinal strain gratings are connected in series with each other through a first optical fiber signal line; the first optical fiber signal line extends from between the central composite core layer and the intermediate composite core layer to outside the composite core insulator post; The first optical fiber signal line is electrically connected with the signal monitoring device through an external optical fiber signal line.

5. The smartly monitorable composite core insulator post according to claim 4, characterized in that: The annular strain gratings are connected in series with each other through a second optical fiber signal line; the second optical fiber signal line extends from between the central composite core layer and the intermediate composite core layer to outside the composite core insulator post; the second optical fiber signal line is electrically connected with the signal monitoring device through the external optical fiber signal line.

6. The smartly monitorable composite core insulator post according to claim 5, wherein: The external optical fiber signal line has a single-line multi-core structure and is electrically connected with the first optical fiber signal line and the second optical fiber signal line respectively.

7. The composite core insulator post of claim 1, wherein: The outer fiber composite material layer is formed by pultrusion, pultrusion and winding processes, or vacuum impregnation.

8. The composite core insulator post of claim 5, wherein: The composite core insulator post is provided with a metal flange at each end; the metal flange at the low-voltage end of the composite core insulator post is provided with a mounting hole; the first optical fiber signal line and the second optical fiber signal line pass out of the mounting hole and are electrically connected with the external optical fiber signal line; the mounting hole is sealed with sealing structural glue.

9. The composite core insulator post of claim 7, wherein: The outer surface of the composite core insulator post is provided with a silicone rubber umbrella cover.

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