Preparation device and preparation method of sample for evaluating insulating property of resin interface

Abstract

The invention provides a preparation device and a preparation method of a sample for evaluating the insulating property of a resin interface. By designing a fiber surface conductive design, a curing grinding tool and a sample preparation method, the conditions that the interface is parallel to the direction of an electric field and the interface has defects are successfully simulated, the effective control on experimental interference factors is realized, the interface performance becomes a unique variable, the insulation performance of the fiber / resin interface can be directly and accurately evaluated, and the test efficiency is improved. The problem that direct evaluation is difficult in a traditional method is solved; according to the method, a simplified operation process is provided, each step from fiber fixing, metal spraying and curing to final electrical tree degradation experiment preparation has clear guidance, so that the operation is simpler and more convenient, and the operation difficulty and the error rate are reduced; as the interface performance becomes a unique variable, the deterioration mechanism and influence factors of the interface insulation performance can be deeply studied, and the method is of great significance in improving the insulation performance of high-voltage equipment and guaranteeing safe and stable operation of a power system.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage electrical experiments, and in particular to a device and method for preparing a sample for evaluating the insulation performance of a resin interface. Background Art

[0002] In power systems, the insulation performance of high-voltage equipment is a key factor in ensuring safe and stable grid operation. With the continued increase in transmission voltage levels and capacity, insulation issues with high-voltage equipment are becoming increasingly prominent. Insulation testing of electrical equipment is a crucial component of high-voltage electrical testing, and electrical testing methods for evaluating the insulation performance of the fiber / resin interface are a key technology.

[0003] In recent years, fiber-reinforced resin composites have been widely used in the insulation of high-voltage equipment, such as dry-type reactors, due to their excellent mechanical and insulation properties. However, under the influence of electric fields and external environments, the insulation performance of fiber-reinforced resin composites may gradually degrade, posing a threat to the safe and stable operation of power systems.

[0004] Fiber-reinforced resin composites consist of a resin matrix and fiber reinforcement. The resin matrix provides the material's adhesion and basic insulation properties, while the fiber reinforcement provides high strength and modulus, resulting in improved mechanical properties and aging resistance. The interfacial bonding between the fiber and matrix significantly influences composite material degradation. When defects exist at this interface, insulation degradation tends to progress rapidly along the interface, exacerbating insulation failure in the composite. Therefore, accurately evaluating the insulation performance of the fiber / resin interface has become a crucial issue in high-voltage electrical testing.

[0005] Traditional insulation performance evaluation methods struggle to directly assess the fiber / resin interface properties. This is primarily due to the numerous influencing factors involved in the experiment, making it impossible to eliminate the interference of other experimental variables. Composite samples contain numerous fiber / resin matrix interfaces. Factors such as the direction of the electric field, fiber and resin types, fiber volume content, and fiber arrangement can all affect the insulation performance test results, making it impossible for these experimental methods to directly evaluate the interface properties. Therefore, making the interface properties the sole variable and eliminating other interfering factors is crucial for observing the electrical treeing degradation phenomenon that develops along the interface and studying the insulation failure mechanisms of composite materials. Summary of the Invention

[0006] In view of this, the present invention provides, on one hand, a device for preparing a sample for evaluating the insulation performance of a resin interface, comprising: A sample preparation mold, comprising a mold body, the mold body being provided with a resin dipping tank and a fiber tank extending transversely through the mold body and communicating with the resin dipping tank, the resin dipping tank dividing the top surface of the mold body into a first side surface and a second side surface, the fiber tank being provided through the first side surface and the second side surface, the fiber tank being used to place fibers, the fibers being placed through the fiber tank and the resin dipping tank, the resin dipping tank being used to carry and cure a resin sample, the angle between the side wall of the resin dipping tank facing the first longitudinal end of the mold body and the bottom of the resin dipping tank being an obtuse angle, forming an inclined surface structure to facilitate demolding of the resin sample; A gold-spraying mold comprises a frame provided with a gold-spraying port, the size of the gold-spraying port matches the size of the mold body, an auxiliary groove is provided at a position corresponding to the fiber groove, which can place fibers and perform gold-spraying on the fibers, and the frame can frame the sample preparation mold so that the fibers placed in the auxiliary groove correspond to the fiber groove.

[0007] Furthermore, the gold-spraying mold is also equipped with a shielding cover that can shield the gold-spraying mold. An opening is provided above the shielding cover. When the fiber is placed in the gold-spraying mold, the part exposed to the opening is sprayed during gold spraying, and a conductive metal layer can be formed on part of the surface of the fiber.

[0008] Furthermore, the width of the first side surface is greater than the width of the second side surface, and the fiber groove provided on the first side surface has the same width as the fiber groove provided on the second side surface, and the two fiber grooves are equidistant from the side wall of the dipping tank toward the second longitudinal end of the mold body.

[0009] Furthermore, the shielding cover can cover the gold-spraying mold, and the gold-spraying mold can cover the sample preparation mold, and the three can be stacked and stored.

[0010] Furthermore, the auxiliary groove is formed by the downward depression of the frame, the depth of the auxiliary groove is consistent with the depth of the fiber groove, and the inner bottom surface of the auxiliary groove and the inner bottom surface of the fiber groove can be maintained at the same horizontal position, so that when the gold spraying mold is placed on the sample preparation mold, the placed fibers form contact bearings with the inner bottom surface of the auxiliary groove and the inner bottom surface of the fiber groove.

[0011] Preferably, the auxiliary groove and the fiber groove are both rectangular groove structures.

[0012] The present invention provides a sample preparation device for evaluating the insulation performance of a resin interface, which has the following advantages: by designing a conductive design on the fiber surface and a solidifying sample preparation mold, the situation in which the interface is parallel to the electric field direction and there are defects in the interface is successfully simulated. The electrical tree sample prepared by the device can effectively control experimental interference factors, making the interface performance the only variable. This innovative design can directly and accurately evaluate the insulation performance of the fiber and resin interface, solving the problem that traditional electrical tree samples are difficult to directly evaluate the interface performance in experiments. Technicians in this field prepare electrical tree samples through the preparation device, apply experimental voltage and observe the growth of electrical trees at the internal fiber / resin interface with a microscope, which can deeply study the deterioration mechanism and influencing factors of the interface insulation performance, which is of great significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of the power system.

[0013] A second aspect of the present invention further provides an electrical dendrite specimen for evaluating resin interface insulation performance, which is manufactured using any of the above-mentioned apparatuses for preparing a specimen for evaluating resin interface insulation performance.

[0014] Furthermore, fibers are provided through the electrical tree specimen; and the surface of the fibers is partially subjected to gold spraying treatment.

[0015] Preferably, the portion of the fiber surface that has not been subjected to the gold spraying treatment is 1 to 5 mm.

[0016] A third aspect of the present invention further provides a method for preparing an electrical dendrite sample for evaluating the insulation performance of a resin interface, the method comprising: Fiber conductive design: Place the fiber in a gold-spraying mold and spray gold to form a metal conductive layer or use other forms of conductive design according to preset requirements; The fiber is placed in the fiber slot, and the gold-spraying mold is moved to frame the sample preparation mold, and the fiber is matched in the fiber slot and the fiber slot is sealed; Preparation of electrical tree specimens: Pour the prepared resin into a resin dipping tank with fibers, cure the resin according to the designed curing process, and obtain the electrical tree specimens after demoulding. For the preparation of electrical tree specimens of other specifications, use a specimen preparation device of other design specifications for evaluating the insulation performance of resin interfaces and follow the above-mentioned operation to prepare electrical tree specimens of other specifications; Preparation for the electrical tree degradation experiment: polish the bottom of the sample prepared above, then paste copper foil on the top and bottom of the sample, connect the top to the high voltage electrode, and connect the bottom to the ground electrode. After applying voltage, conduct the electrical tree degradation experiment.

[0017] Furthermore, in the fiber conductive design, the method of adopting other forms of conductive design is: applying a conductive layer on the fiber surface; Preferably, the surface of the fiber is dipped in conductive glue.

[0018] Furthermore, when the fiber is designed to be conductive, the length of the portion not containing the conductive layer located in the dipping tank of the sample preparation mold is controlled to be 1-5 mm.

[0019] Furthermore, when preparing electrical tree specimens of different shapes, the fiber used is any one of aramid fiber, glass fiber or polyester fiber.

[0020] Preferably, the fiber form used is fiber filament.

[0021] The present invention provides a method for preparing an electrical tree specimen for evaluating the insulation performance of a resin interface. The method has the following advantages: by designing a conductive fiber surface, a curing mold, and a sample preparation method, the method successfully simulates a situation where the interface is parallel to the electric field direction and has defects, effectively controlling experimental interference factors and making the interface performance the sole variable. This innovative method can directly and accurately evaluate the insulation performance of the fiber / resin interface, solving the problem of traditional methods having difficulty directly evaluating interface performance. The method also provides a simplified operational process with clear instructions for each step, from fiber fixation, gold spraying, curing, to the final preparation for the electrical tree degradation experiment, making the operation easier and reducing the difficulty and error rate. The present invention provides a new electrical tree specimen preparation device and method for observing electrical tree degradation along the interface and studying the insulation failure mechanism of composite materials. By applying an experimental voltage to the prepared electrical tree specimen and observing the electrical tree growth at the internal fiber / resin interface using a microscope, since the interface performance is the sole variable, in-depth research can be conducted on the degradation mechanism and influencing factors of the interface insulation performance. This is of great significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic structural diagram of a device for preparing a sample for evaluating the insulation performance of a resin interface provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a sample preparation device for evaluating the insulation performance of a resin interface provided by an embodiment of the present invention when stored; Figure 3A schematic structural diagram of a sample preparation mold provided in an embodiment of the present invention; Figure 4 A schematic structural diagram of an electrical dendrite sample prepared by a preparation device provided in an embodiment of the present invention; Figure 5 A flow chart of a method for preparing an electrical dendrite specimen for evaluating the insulation performance of a resin interface provided by an embodiment of the present invention; 1. Sample preparation mold, 2. Spraying mold, 3. Masking cover, 4. Fiber, 5. Electrical tree specimen; 11. Glue dipping tank, 12. Fiber tank, 13. First side, 14. Second side, 15. Inclined structure, 21. Frame, 22. Auxiliary tank, 23. Spray nozzle, 31. Opening, 41. Conductive layer, 42. Part of the conductive layer not covered by the fibers. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] See also Figure 1-3As shown, it is a sample preparation device for evaluating the interface insulation performance of resin disclosed in an embodiment of the present invention, including a sample preparation mold 1, a gold spraying mold 2 and a shielding cover 3; the sample preparation mold 1 includes a mold body, the mold body is provided with a dipping tank 11 and a fiber tank 12 that passes through the mold body in the transverse direction and is connected to the dipping tank 11, the dipping tank 11 divides the top surface of the mold body into a first side surface 13 and a second side surface 14, the fiber tank 12 is arranged through the first side surface 13 and the second side surface 14, the fiber tank 12 is used to place the fiber 4, and the fiber 4 is placed through the fiber tank 12 and the dipping tank 11, the dipping tank 11 is used to carry and solidify the resin sample, the side wall of the dipping tank 11 facing the first longitudinal end of the mold body and the bottom of the dipping tank 11 The included angle is an obtuse angle, forming a slope structure 15, which is convenient for demolding the resin sample; the gold-spraying mold 2 includes a frame 21 provided with a gold-spraying port 23, the size of the gold-spraying port 23 matches the size of the mold body, and the position of the frame 21 corresponding to the fiber slot 12 is provided with an auxiliary slot 22, which can place the fiber 4 and can perform gold-spraying on the fiber 4. The frame 21 can frame the sample preparation mold 1 so that the fiber 4 placed in the auxiliary slot 22 corresponds to the fiber slot 12; the gold-spraying mold 2 is also equipped with the shielding cover 3, which can shield the gold-spraying mold 2. The shielding cover 3 is provided with an opening 31 above the shielding cover 3. When gold is sprayed, the fiber 4 placed in the gold-spraying mold 2 is sprayed at the part exposed to the opening 31, so that a conductive metal layer can be formed on part of the surface of the fiber 4.

[0025] Reference Figure 1 、 3 As shown, the width of the first side surface 13 is greater than the width of the second side surface 14, which provides a larger bearing area for placing the fiber strips or fiber bundles in the fiber groove 12 at the first side surface 13, thereby improving the placement stability. The fiber groove 12 provided on the first side surface 13 has the same width as the fiber groove 12 provided on the second side surface 14, and the two fiber grooves 12 are at equal distances from the side wall of the dipping tank 11 toward the second longitudinal end of the mold body.

[0026] Reference Figure 1-2 As shown, the shielding cover 3 can cover the gold-spraying mold 2, and the gold-spraying mold 2 can cover the sample preparation mold 1. The three can be stacked and stored, which is convenient for storing the entire device and reduces occupied space.

[0027] In this embodiment, the auxiliary groove 22 is formed by the downward depression of the frame 21. The depth of the auxiliary groove 22 is consistent with the depth of the fiber groove 12, and the inner bottom surface of the auxiliary groove 22 and the inner bottom surface of the fiber groove 12 can be maintained at the same horizontal position, so that when the gold spraying mold 2 is placed on the sample preparation mold 1, the placed fiber 4 forms a contact bearing with the inner bottom surface of the auxiliary groove 22 and the inner bottom surface of the fiber groove 12.

[0028] Reference Figure 1-2 As shown, the auxiliary groove 22 and the fiber groove 21 are both rectangular groove structures.

[0029] A device for preparing samples for evaluating the insulation performance of resin interfaces disclosed in an embodiment of the present invention has the following beneficial technical effects: by designing a conductive design on the fiber surface and preparing a mold for curing the sample, the situation in which the interface is parallel to the electric field direction and there are defects in the interface is successfully simulated. The electrical tree sample prepared by the device can effectively control experimental interference factors, making the interface performance the only variable. This innovative design can directly and accurately evaluate the insulation performance of the fiber and resin interface, solving the problem that traditional electrical tree samples are difficult to directly evaluate the interface performance in experiments. Technicians in this field prepare electrical tree samples through the preparation device, apply experimental voltage and observe the growth of electrical trees at the internal fiber / resin interface with a microscope, so as to deeply study the deterioration mechanism and influencing factors of the interface insulation performance, which is of great significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of the power system.

[0030] The embodiment of the present invention also discloses an electrical tree specimen 5 for evaluating the insulation performance of a resin interface, which is made by applying the preparation device for evaluating the insulation performance of a resin interface disclosed in the above embodiment. Figure 4 As shown, a fiber 4 is inserted through an electrical tree specimen 5. The surface of the fiber 4 is partially coated with gold, as shown in conductive layer 41, which is the coated portion. The portion of the fiber 4 not coated with gold is 1-5 mm. In this embodiment, the portion of the fiber not coated with gold is 1 ± 0.1 mm, as shown in portion 42 of the fiber not coated with conductive layer.

[0031] The embodiment of the present invention also discloses a method for preparing an electrical tree specimen for evaluating the insulation performance of a resin interface, which is prepared by using the preparation device for evaluating the insulation performance of a resin interface disclosed in the above embodiment. Figure 5 Shown, including: S01, fiber conductive design: Place the fiber 4 in the gold spraying mold 2, and perform gold spraying to form a metal conductive layer 41 according to preset requirements or adopt other forms of conductive design. When gold spraying the fiber 4, the gold sprayed part is sprayed 360°; S02, the fiber is placed in the fiber slot, the gold-spraying mold 2 is moved to frame the sample preparation mold 1, and the fiber 4 is matched in the fiber slot 12, and the outermost end of the fiber 4 is placed in the auxiliary slot 22, thereby blocking part of the fiber slot 12; S03, preparing the electrical tree specimen, pouring the prepared resin into the dipping tank 11 provided with the fiber 4, curing the resin according to the designed curing process, and obtaining the electrical tree specimen 5 after demoulding; S04. Preparation of electrical tree specimens of other specifications. Using a preparation device for specimens for evaluating resin interface insulation performance of other design specifications, prepare electrical tree specimens of other specifications according to the above operations. Various electrical tree specimens can be prepared by adjusting the size of the fiber slots and their placement in the mold body, and the size and placement of the auxiliary slots can be adjusted accordingly. S05, preparation for electrical tree degradation experiment, polish the bottom of each sample prepared above, then paste copper foil on the top and bottom of the sample, connect the top to the high voltage electrode, and the bottom to the ground electrode. After applying voltage, conduct electrical tree degradation experiment. The connection method of high and low voltage electrodes is as follows: Figure 4 shown.

[0032] In this embodiment, in the fiber conductive design, when other forms of conductive design are adopted, a conductive layer can be applied to the fiber surface; for example, a conductive glue can be dipped on the fiber surface.

[0033] In this embodiment, refer to Figure 4 As shown, when designing the conductive fibers, the length of the portion of the fiber located within the resin dipping tank of the sample preparation mold, excluding the conductive layer, is controlled to be 1-5 mm, referring to the portion 42 of the fiber not covered by the conductive layer. Specifically, a smaller proportion of the non-conductive portion is set, so that the portion 42 of the fiber not covered by the conductive layer is subjected to high voltage. As a result, in the electrical tree degradation experiment, the degradation trend develops along the interface of the fiber 4, which can better characterize the electrical insulation properties of the interface.

[0034] In this embodiment, when preparing electrical tree branches of different shapes, the fibers used are any one of aramid fibers, glass fibers, or polyester fibers. In this embodiment, the preferred fiber shape is fiber filaments.

[0035] The present invention provides a method for preparing electrical tree specimens for evaluating the insulation performance of resin interfaces. The method offers the following advantages: By designing a conductive fiber surface, a curing mold, and a sample preparation method, it successfully simulates a situation where the interface is parallel to the electric field direction and has defects. This effectively controls experimental interference factors, making the interface performance the sole variable. This innovative method can directly and accurately evaluate the insulation performance of the fiber / resin interface, resolving the difficulty of directly evaluating interface performance with traditional methods. The method also provides a simplified operational process, with clear instructions for each step, from fiber fixation, gold spraying, and curing to the final preparation for the electrical tree degradation experiment, making the operation easier and reducing operational difficulty and error rates. The present invention provides a novel electrical tree specimen preparation device and method for observing electrical tree degradation along the interface and studying the insulation failure mechanism of composite materials. By applying an experimental voltage to the prepared electrical tree specimen and observing the electrical tree growth at the fiber / resin interface using a microscope, the sole variable, which makes the interface insulation performance degradation mechanism and influencing factors, can be deeply studied. This is of great significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of power systems.

[0036] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0037] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A device for preparing a sample for evaluating the insulation performance of a resin interface, characterized in that: include: A sample preparation mold, comprising a mold body, the mold body is provided with a resin dipping tank and a fiber tank that runs through the mold body in the transverse direction and is connected to the resin dipping tank, the resin dipping tank divides the top surface of the mold body into a first side surface and a second side surface, the fiber tank is arranged to pass through the first side surface and the second side surface, the fiber tank is used to place fibers, and the fibers pass through the fiber tank and the resin dipping tank when placed, the resin dipping tank is used to carry and solidify the resin sample, and the side wall of the resin dipping tank facing the first longitudinal end of the mold body is at an obtuse angle with the bottom of the resin dipping tank, forming an inclined surface structure, which is convenient for demolding the resin sample; The gold-spraying mold comprises a frame provided with a gold-spraying port, the size of the gold-spraying port matches the size of the mold body, the position of the frame corresponding to the fiber slot is provided with an auxiliary slot, which can place fibers and perform gold-spraying on the fibers, and the frame can frame the sample preparation mold so that the fibers placed in the auxiliary slot correspond to the fiber slot.

2. The device for preparing a sample for evaluating the insulation performance of a resin interface according to claim 1, characterized in that: The gold-spraying mold is also equipped with a shielding cover that can shield the gold-spraying mold. An opening is provided above the shielding cover. When the fiber is placed in the gold-spraying mold, the part exposed to the opening is sprayed, so that a conductive metal layer can be formed on a part of the surface of the fiber.

3. The device for preparing a sample for evaluating the insulation performance of a resin interface according to claim 1, characterized in that: The width of the first side surface is greater than that of the second side surface, and the fiber groove arranged on the first side surface has the same width as the fiber groove arranged on the second side surface, and the two fiber grooves are at equal distances from the side wall of the dipping tank toward the second longitudinal end of the mold body.

4. The device for preparing a sample for evaluating the resin interface insulation performance according to claim 2, characterized in that: The shielding cover can cover the gold-spraying mold, and the gold-spraying mold can cover the sample preparation mold, and the three can be stacked and stored.

5. The device for preparing a sample for evaluating the insulation performance of a resin interface according to claim 1, characterized in that: The auxiliary groove is formed by the frame being recessed downward, the depth of the auxiliary groove is consistent with the depth of the fiber groove, and the inner bottom surface of the auxiliary groove and the inner bottom surface of the fiber groove can be maintained at the same horizontal position, so that when the gold-spraying mold is placed on the sample preparation mold, the placed fibers form contact bearings with the inner bottom surface of the auxiliary groove and the inner bottom surface of the fiber groove; preferably, the auxiliary groove and the fiber groove are both rectangular groove structures.

6. An electrical tree specimen for evaluating the insulation performance of a resin interface, characterized in that: The device for preparing a sample for evaluating the resin interface insulation performance described in any one of 1 to 5 is used to make the sample.

7. A method for preparing an electrical tree specimen for evaluating the insulation performance of a resin interface, characterized in that: The sample preparation device for evaluating the insulation performance of a resin interface according to any one of claims 1 to 5 is used for preparation, comprising: Fiber conductive design: Place the fiber in a gold-spraying mold, and spray gold to form a metal conductive layer or use other forms of conductive design according to preset requirements; The fiber is placed in the fiber slot, and the gold-spraying mold is moved to frame the sample preparation mold. The fiber groove is matched in the fiber groove and blocks the fiber groove; Preparation of electrical tree specimens: pour the prepared resin into a resin dipping tank with fibers, cure the resin according to the designed curing process, and obtain the electrical tree specimens after demoulding; The preparation of electrical tree specimens of other specifications is carried out by using a preparation device for specimens for evaluating the insulation performance of resin interfaces of other design specifications and following the above-mentioned operation; Preparation for electrical tree degradation experiment: grind the bottom of the sample prepared above, then paste copper foil on the top and bottom of the sample, connect the top to the high voltage electrode, and connect the bottom to the ground electrode. After applying voltage, conduct electrical tree degradation experiment.

8. The experimental method for evaluating the insulation performance of a resin interface according to claim 7, characterized in that: In the fiber conductive design, the method of adopting other forms of conductive design is: applying a conductive layer on the fiber surface; preferably, dipping in conductive glue.

9. The experimental method for evaluating the insulation performance of a resin interface according to claim 7, characterized in that: When the fiber is designed to be conductive, the length of the portion located in the dipping tank of the sample preparation mold without the conductive layer is controlled to be 1-5 mm.

10. The experimental method for evaluating the insulation performance of a resin interface according to claim 7, characterized in that: When preparing electric tree branch samples of different specifications, the fiber used is any one of aramid fiber, glass fiber or polyester fiber; preferably, the fiber form used is fiber filament.

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