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

Abstract

The utility model provides a sample preparation device for resin interface insulating property evaluation and a sample, the device comprises a sample preparation mold and a metal spraying mold, the sample preparation mold is provided with a gum dipping groove and a fiber groove, the fiber groove is used for placing fibers, and the fibers penetrate through the fiber groove and the gum dipping groove when placed. An included angle between the side wall, facing the first longitudinal end of the sample preparation mold body, of the impregnation groove and the groove bottom of the impregnation groove is an obtuse angle, and an inclined surface structure is formed, so that the branch sample is convenient to demold; the metal spraying mold comprises a frame body provided with a metal spraying opening, the metal spraying opening is matched with the sample preparation mold in size, an auxiliary groove is formed in the position, corresponding to the fiber groove, of the frame body and used for containing fibers, and the frame body can frame the sample preparation mold, so that the fibers placed in the auxiliary groove correspond to the interior of the fiber groove. The electrical tree test sample prepared by the device can be used for observing the growth condition of the electrical tree at the internal fiber / resin interface so as to research the degradation mechanism and influence factors of the interface insulation performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -voltage electrical experiment technical field, more particularly, relate to a kind of preparation device and preparation method for resin interface insulation performance evaluation sample. BACKGROUND

[0002] In power system, the insulation performance of high-voltage equipment is one of the key factors to ensure the safe and stable operation of power grid. With the further improvement of transmission voltage level and transmission capacity, the insulation problem of high-voltage equipment is increasingly prominent. Insulation testing of electrical equipment is a crucial link in high-voltage electrical test, and the electrical test method for evaluating the insulation performance of fiber / resin interface is a key technology.

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

[0004] Fiber-reinforced resin composite materials are composed of resin matrix and fiber reinforcement. The resin matrix provides the adhesion and basic insulation performance of the material, while the fiber reinforcement provides high strength and high modulus, making the material have better mechanical properties and aging resistance. The interface bonding of fiber / matrix has an important influence on the degradation of composite materials. When there are defects in the interface, insulation degradation tends to develop rapidly along the interface, exacerbating the insulation failure of composite materials. Therefore, how to accurately evaluate the insulation performance of fiber / resin interface has become an important issue in the field of high-voltage electrical test.

[0005] Traditional insulation performance evaluation methods cannot directly evaluate the interface performance of fiber / resin. The main reason is that there are many influencing factors in the experiment, and it is difficult to exclude the interference of other experimental variables. Composite material samples contain a large number of fiber / resin matrix interfaces, and factors such as electric field direction, fiber and resin type, fiber volume content and arrangement will affect the insulation performance test results, making the experimental method unable to directly evaluate the interface performance, thus making the interface performance the only variable, excluding other interference factors, which is crucial for observing the electrical treeing degradation phenomenon along the interface and studying the insulation failure mechanism of composite materials. SUMMARY

[0006] Therefore, the utility model provides a kind of preparation device for resin interface insulation performance evaluation sample, comprising:

[0007] The sample preparation mold comprises a mold body, the mold body is provided with a resin immersion groove and a fiber groove which is transversely through the mold body and communicates with the resin immersion groove, the resin immersion groove separates the top surface of the mold body into a first side and a second side, the fiber groove is arranged through the first side and the second side, the fiber groove is used for placing fibers, the fibers are placed through the fiber groove and the resin immersion groove, the resin immersion groove is used for carrying and curing a tree sample, the side wall of the resin immersion groove towards the longitudinal first end of the mold body forms an obtuse angle with the groove bottom of the resin immersion groove, forming an inclined surface structure, facilitating the demolding of the tree sample.

[0008] The electroplating mold comprises a frame body provided with an electroplating opening, the size of the electroplating opening matches the size of the mold body, the frame body is provided with an auxiliary groove at a position corresponding to the fiber groove, the auxiliary groove is used for placing fibers and electroplating the fibers, and the frame body can frame the sample preparation mold, so that the fibers placed in the auxiliary groove are correspondingly placed in the fiber groove.

[0009] Preferably, the electroplating mold is further provided with a shielding cover which can shield the electroplating mold, the shielding cover is provided with an opening at the top, and the fibers placed in the electroplating mold are exposed to the opening for electroplating, so that a conductive metal layer can be formed on part of the surface of the fibers.

[0010] Preferably, the width of the first side is greater than the width of the second side, the fiber groove arranged on the first side has the same width as the fiber groove arranged on the second side, and the distances between the two fiber grooves and the side wall of the resin immersion groove towards the longitudinal second end of the mold body are equal.

[0011] Preferably, the shielding cover can cover the electroplating mold, the electroplating mold can cover the sample preparation mold, and the three can be nested.

[0012] Preferably, the auxiliary groove is formed by downward recessing the frame body, 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 kept at the same horizontal position, so that when the electroplating mold is sleeved on the sample preparation mold, the fibers are in contact with the inner bottom surface of the auxiliary groove and the inner bottom surface of the fiber groove.

[0013] Preferably, the auxiliary groove and the fiber groove are both rectangular groove structures.

[0014] The utility model provides a kind of sample preparation device for resin interface insulation performance evaluation, with following advantages: by design fiber surface conduction design, solidification sample preparation mould, successfully simulate the interface and electric field direction parallel and interface exists the condition of defect, the electrical tree sample prepared by the device can effectively control experimental interference factors, so that interface performance becomes only variable, this innovative design can directly and accurately evaluate the insulation performance of fiber and resin interface, solve the problem that traditional electrical tree sample is difficult to directly evaluate interface performance in experiment, the electrical tree sample is prepared by the preparation device of the field skilled personnel, experimental voltage is applied, and the growth of electrical tree in the fiber / resin interface is observed by microscope, the degradation mechanism and influencing factors of interface insulation performance can be studied in depth, which is of great significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of power system.

[0015] The utility model also provides another aspect of a kind of electrical tree sample for resin interface insulation performance evaluation, which is made by the sample preparation device for resin interface insulation performance evaluation described in any of the above.

[0016] Preferably, a fiber is provided through the electrical tree sample, and a surface portion of the fiber is subjected to gold spraying treatment

[0017] Preferably, the portion of the fiber surface not subjected to gold spraying treatment is 1-5 mm.

[0018] Preferably, the portion of the fiber in the electrical tree sample not subjected to gold spraying treatment is 1±0.1 mm.

[0019] The electrical tree sample for resin interface insulation performance evaluation provided by the utility model successfully simulates the condition that the interface is parallel to the electric field direction and the interface has defects, and the electrical tree sample can effectively control experimental interference factors, so that interface performance becomes only variable. This innovative design can directly and accurately evaluate the insulation performance of fiber and resin interface, solving the problem that traditional electrical tree sample is difficult to directly evaluate interface performance in experiment. The field skilled personnel can study the degradation mechanism and influencing factors of interface insulation performance in depth by the electrical tree sample, applying experimental voltage and observing the growth of electrical tree in the fiber / resin interface by microscope, which is of great significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of power system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in any respect. Furthermore, the purpose of the drawings is to illustrate preferred embodiments of the application and not to limit the scope of the application. In the drawings:

[0021] Figure 1 A structure schematic view of the sample preparation device for resin interface insulation performance evaluation provided by the embodiment of the present application;

[0022] Figure 2 A structure schematic view of the sample preparation device for resin interface insulation performance evaluation provided by the embodiment of the present application in storage;

[0023] Figure 3 A structure schematic view of the sample preparation mold provided by the embodiment of the present application;

[0024] Figure 4 A structure schematic view of the electrical tree sample prepared by the preparation device provided by the embodiment of the present application;

[0025] 1, sample preparation mold, 2, gold spraying mold, 3, shielding cover, 4, fiber, 5, electrical tree sample;

[0026] 11, impregnation groove, 12, fiber groove, 13, first side, 14, second side, 15, inclined surface structure 21, frame body, 22, auxiliary groove, 23, gold spraying port, 31, open, 41, conductive layer, 42, fiber uncovered conductive layer part. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0028] Reference should be made to Figures 1-3As shown, it is the sample preparation device for resin interface insulation performance evaluation embodiment disclosed by the utility model, including sample preparation mold 1, spray gold mold 2 and shielding cover 3;Sample preparation mold 1 includes mold body, the mold body is set up and is communicated with the fiber groove 12 of the impregnation groove 11 along the transverse through the mold body, the impregnation groove 11 separates the top surface of the mold body into first side 13 and second side 14, the fiber groove 12 is set through the first side 13 and the second side 14, the fiber groove 12 is used to place fiber 4, the fiber 4 is placed and is placed through the fiber groove 12 and the impregnation groove 11, the impregnation groove 11 is used to bear and solidify tree branch sample, the side wall of the impregnation groove 11 towards the longitudinal first end of the mold body and the groove bottom of the impregnation groove 11 are obtuse angle, form inclined plane structure 15, facilitate the tree branch sample demolding;Spray gold mold 2 includes the frame body 21 with spray gold mouth 23, the size of the spray gold mouth 23 is matched with the size of the mold body, the corresponding position of the frame body 21 with the fiber groove 12 is equipped with auxiliary groove 22, can place fiber 4, and carries out spray gold processing to fiber 4, the frame body 21 can frame the sample preparation mold 1, and the fiber 4 placed in the auxiliary groove 22 is corresponded to the fiber groove 12;The spray gold mold 2 is also equipped with the shielding cover 3, can shield the spray gold mold 2, the shielding cover 3 is equipped with the open mouth 31 on top, the fiber 4 placed in the spray gold mold 2, when spraying, the part exposed to the open mouth 31 is sprayed, can form conductive metal layer on the part surface of the fiber 4.

[0029] Referring to Figure 1 、 3 As shown, the width of the first side 13 is greater than the width of the second side 14, which provides a larger bearing area when the fiber strip or fiber bundle is placed in the fiber groove 12 at the first side 13 position, improves the stability of placement, and the fiber groove 12 provided at the first side 13 has the same width as the fiber groove 12 provided at the second side 14, and the distance between the two fiber grooves 12 and the side wall of the impregnation groove 11 towards the longitudinal second end of the mold body is equal.

[0030] Referring to Figures 1-2 As shown, the shielding cover 3 can cover the spray gold mold 2, the spray gold mold 2 can cover the sample preparation mold 1, and the three can be nested for storage, which is convenient for the storage of the entire device and reduces the occupied space.

[0031] In the embodiment, the auxiliary groove 22 is formed by downward recessing the frame body 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 kept at the same horizontal position, so that when the electroforming mold 2 is placed in the sample preparation mold 1, the placed fiber 4 is in contact with the inner bottom surface of the auxiliary groove 22 and the inner bottom surface of the fiber groove 12.

[0032] Referring to Figures 1-2 As shown in the figure, the auxiliary groove 22 and the fiber groove 21 are both rectangular groove structures.

[0033] The sample preparation device for resin interface insulation performance evaluation disclosed in the embodiment of the utility model has the following beneficial technical effects: through the design of the fiber surface conductive design and the curing sample preparation mold, the situation that the interface is parallel to the electric field direction and the interface has defects is successfully simulated, the electrical tree sample prepared by the device can effectively control the experimental interference factors, the interface performance becomes the only variable, the innovative design can directly and accurately evaluate the insulation performance of the fiber and resin interface, solves the problem that the traditional electrical tree sample is difficult to directly evaluate the interface performance in the experiment, and the person skilled in the art can deeply study the deterioration mechanism and influencing factors of the interface insulation performance by preparing the electrical tree sample through the preparation device, applying the experimental voltage and observing the growth of the electrical tree of the internal fiber / resin interface with a microscope, which has important significance for improving the insulation performance of high-voltage equipment and ensuring the safe and stable operation of the power system.

[0034] The embodiment of the utility model discloses an electrical tree sample 5 for resin interface insulation performance evaluation, which is made of the sample preparation device for resin interface insulation performance evaluation disclosed in the above embodiment, and refers to Figure 4 As shown in the figure, the fiber 4 is arranged through the electrical tree sample 5, and part of the surface of the fiber 4 is subjected to electroplating treatment, that is, the conductive layer 41, that is, the part subjected to electroplating treatment. Among them, the part of the surface of the fiber 4 not subjected to electroplating treatment is 1-5mm, the part of the fiber in the electrical tree sample of the embodiment not subjected to electroplating treatment is 1±0.1mm, and the fiber not covered with the conductive layer part 42 is referred to. The length of the part not containing the conductive layer in the impregnation groove of the sample preparation mold is controlled to be 1-5mm, and the fiber not covered with the conductive layer part 42 is referred to. Specifically, a smaller proportion is arranged for the non-conductive part, so that the fiber not covered with the conductive layer part 42 bears high voltage, so that in the electrical tree deterioration experiment, the deterioration trend develops along the interface of the fiber 4, and the electrical insulation characteristics of the interface can be better characterized.

[0035] The embodiment of the utility model discloses a preparation method of an electrical tree sample for resin interface insulation performance evaluation, and the preparation is carried out by using the preparation device for the sample for resin interface insulation performance evaluation disclosed in the above embodiment, and the preparation device comprises:

[0036] S01, fiber conductive design, the fiber 4 is placed in the metal spraying mold 2, according to the preset demand, metal conductive layer 41 is formed by metal spraying or other forms are used for conductive design, when the fiber 4 is sprayed, the part of spraying is 360 ° sprayed;

[0037] S02, the fiber is placed in the fiber groove, the metal spraying mold 2 is moved to frame the sample preparation mold 1, meanwhile, the fiber 4 is matched in the fiber groove 12, and the outermost end of the fiber 4 is placed in the auxiliary groove 22, and part of the fiber groove 12 is blocked;

[0038] S03, electrical tree sample preparation, the matched resin is poured into the impregnation groove 11 provided with the fiber 4, the resin curing is completed according to the designed curing process, and the electrical tree sample 5 is obtained after demolding;

[0039] S04, preparation of other specifications of electrical tree samples, other design specifications of the preparation device for the sample for resin interface insulation performance evaluation are used, and the preparation of other specifications of electrical tree samples is carried out according to the above operation, the size of the fiber groove and the setting position of the mold body can be adjusted to diversify the preparation of the electrical tree sample, and the size and setting position of the auxiliary groove are adjusted correspondingly;

[0040] S05, electrical tree degradation experiment preparation, the bottom of each sample prepared above is polished, then copper foil is pasted on the top and bottom of the sample, the top is connected with the high-voltage electrode, and the bottom is connected with the ground electrode, after voltage is applied, the electrical tree degradation experiment is carried out, and the connection mode of the high-voltage electrode and the low-voltage electrode is shown in the drawing. Figure 4

[0041] In the fiber conductive design in the embodiment, when other forms are used for conductive design, a conductive layer can be applied on the surface of the fiber, for example, conductive glue is dip-coated on the surface of the fiber.

[0042] In the embodiment, when different forms of electrical tree samples are prepared, the fiber used is any one of aramid fiber, glass fiber or polyester fiber. In the embodiment, the fiber form used is fiber silk.

[0043] ​The utility model provides a kind of for resin interface insulation performance evaluation's preparation method of electrical tree sample, with following advantages: by design fiber surface conduction design, curing tool and sample preparation method, successfully simulate the interface and electric field direction parallel and interface exists the condition of defect, realize the effective control to experimental interference factor, so that interface performance becomes only variable, this innovative method can directly, accurately evaluate the insulation performance of fiber / resin interface, solve the problem that traditional method is difficult to directly evaluate interface performance;The method provides a simplified operation process, from the fixation of fiber, spraying, solidification to the final electrical tree deterioration experiment preparation, each step has definite guidance, so that operation is more simple, reduces operation difficulty and error rate;The utility model provides new electrical tree sample preparation device and method for observing along interface development electrical tree deterioration phenomenon and researching composite material insulation failure mechanism, by applying experimental voltage to the prepared electrical tree sample and observing the growth of electrical tree inside fiber / resin interface with microscope, since interface performance becomes only variable, can in-depth study the deterioration mechanism and influencing factor of interface insulation performance, it has important significance for improving the insulation performance of high-voltage equipment and guaranteeing the safe and stable operation of power system.

[0044] It should be noted that, in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely 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, and therefore cannot be understood as a limitation on the utility model.

[0045] In addition, it should also be noted that, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0046] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalent technologies, the utility model also intends to include these modifications and variations.

Claims

1. An apparatus for preparing a sample for evaluating the interfacial insulation performance of resin, characterized in that, include: A sample preparation mold includes a mold body, wherein the mold body has an impregnation tank and a fiber groove that runs transversely through the mold body and communicates with the impregnation tank. The impregnation tank divides the top surface of the mold body into a first side and a second side. The fiber groove runs through the first side and the second side and is used to place fibers. The fibers are placed through the fiber groove and the impregnation tank. The impregnation tank is used to support and cure the tree branch sample. The side wall of the impregnation tank facing the first longitudinal end of the mold body forms an obtuse angle with the bottom of the impregnation tank, forming a sloping structure to facilitate demolding of the tree branch sample. A gold spraying mold includes a frame with a gold spraying nozzle, the size of which matches the size of the mold body. The frame has an auxiliary groove at a position corresponding to the fiber groove, which can hold fibers and perform gold spraying on the fibers. The frame can frame the sample preparation mold, so that the fibers placed in the auxiliary groove correspond to the fiber groove.

2. The apparatus for preparing a sample for evaluating the interfacial insulation performance of resin according to claim 1, characterized in that, The gold spraying mold is also equipped with a shielding cover, which can shield the gold spraying mold. The shielding cover has an opening at the top. When the fiber is placed in the gold spraying mold, the part exposed in the opening is sprayed during gold spraying, which can form a conductive metal layer on part of the surface of the fiber.

3. The apparatus for preparing a sample for evaluating the interfacial insulation performance of resin according to claim 1, characterized in that, The width of the first side is greater than the width of the second side, and the fiber grooves on the first side and the fiber grooves on the second side have the same width. The two fiber grooves are equidistant from the sidewall of the impregnation tank facing the longitudinal second end of the mold body.

4. The apparatus for preparing a sample for evaluating the interfacial insulation performance of resin 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. The three can be stacked and stored together.

5. The apparatus for preparing a sample for evaluating the interfacial insulation performance of resin according to claim 1, characterized in that, The auxiliary groove is formed by the downward indentation 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 kept at the same level. This ensures that when the gold spraying mold is placed on the sample preparation mold, the placed fiber forms contact and bears the load with both the inner bottom surface of the auxiliary groove and the inner bottom surface of the fiber groove.

6. The apparatus for preparing a sample for evaluating the interfacial insulation performance of resin according to claim 1, characterized in that, Both the auxiliary groove and the fiber groove are rectangular groove structures.

7. An electrical tree specimen for evaluating the interfacial insulation performance of resins, characterized in that, The apparatus used in any one of 1-6 for preparing a sample for evaluating the interfacial insulation performance of resin is manufactured.

8. The electrical tree specimen for evaluating the insulating properties of resin interfaces according to claim 7, characterized in that, The electrical tree sample contains fibers that penetrate it, and the surface of the fibers is partially sprayed with gold.

9. The electrical tree specimen for evaluating the interfacial insulation performance of resin according to claim 8, characterized in that, The portion of the fiber surface that has not undergone gold spraying treatment is 1-5 mm.

10. The electrical tree specimen for evaluating the insulating properties of resin interfaces according to claim 9, characterized in that, The portion of the fiber in the electrical tree sample that was not treated with gold spraying was 1 ± 0.1 mm.

Images