阅读说明：本技术 液体渗透作用下固体绝缘材料电阻率测试装置 (Solid insulating material resistivity testing device under liquid permeation action ) 是由 刘书明 李少华 姜廷域 梁曦东 吴文斌 王晓杰 于 2020-05-12 设计创作，主要内容包括：本发明公开了一种液体渗透作用下固体绝缘材料电阻率测试装置,包括：底座、顶盖部分和金属筛,其中,底座包括三腿支架、底座主体、圆形内电极、环形外电极、聚四氟乙烯绝缘件和螺杆接线柱,三腿支架在底座主体的底部,用于支撑三腿支架,顶盖部分包括顶盖和上电极,通过上电极将顶盖部分与金属筛连接。该装置能够有效地解决电阻率测试的过程中必须将试品从液体中取出的问题,可以广泛应用于液体侵入对固体材料电阻率影响的测试中。(The invention discloses a solid insulating material resistivity testing device under the action of liquid permeation, which comprises: the base comprises a three-leg support, a base main body, a circular inner electrode, an annular outer electrode, a polytetrafluoroethylene insulating part and a screw binding post, the three-leg support is arranged at the bottom of the base main body and used for supporting the three-leg support, the top cover part comprises a top cover and an upper electrode, and the top cover part is connected with the metal sieve through the upper electrode. The device can effectively solve the problem that a test article needs to be taken out of liquid in the resistivity test process, and can be widely applied to the test of the influence of liquid invasion on the resistivity of a solid material.)

1. The utility model provides a solid insulation material resistivity testing arrangement under liquid infiltration which characterized in that includes: the metal screen comprises a base, a top cover part and a metal screen, wherein the base comprises a three-leg support, a base main body, a circular inner electrode, an annular outer electrode, a polytetrafluoroethylene insulating part and a screw post, the three-leg support is arranged at the bottom of the base main body and used for supporting the three-leg support, the top cover part comprises a top cover and an upper electrode, and the top cover part is connected with the metal screen through the upper electrode.

2. The apparatus for testing resistivity of solid insulation material under liquid permeation according to claim 1, wherein the base body is circular in plan view, has a U-shaped longitudinal section, and is internally threaded on both sides of the U-shape.

3. The resistivity testing device for solid insulating materials under the action of liquid permeation of claim 1, wherein the annular outer electrode, the polytetrafluoroethylene insulating member and the circular inner electrode are embedded in the bottom of the base body from outside to inside in sequence.

4. The resistivity testing device for the solid insulating material under the liquid permeation action according to claim 1, wherein the annular outer electrode and the circular inner electrode are respectively connected with the screw terminal for connecting a test wire, and are insulated from each other by the polytetrafluoroethylene insulating part.

5. The apparatus of claim 1, wherein the top cap is circular and has an inverted U-shaped cross-section, the outer diameter of each side of the inverted U-shape is identical to the inner diameter of each side of the U-shape of the base body, and the lower portion of each side of the inverted U-shape has threads that are engaged with the threads on the inside of each side of the U-shape of the base body.

6. The resistivity testing device for the solid insulating material under the liquid permeation action of claim 1, wherein the top of the top cover is provided with five threaded holes, water injection holes and vent holes which are distributed in a cross shape, screw terminals are screwed in the threaded holes respectively for wiring, through holes of the water injection holes are used for injecting water, and the vent holes are used for keeping the air pressure inside and outside the cavity balanced during water injection.

7. The apparatus for testing resistivity of solid insulating material under liquid permeation of claim 1, wherein the metal screen is circular, and the diameter of the circle is smaller than the inner diameter of the two sides of the inverted U-shape of the top cap and smaller than the outer diameter of the annular outer electrode.

Technical Field

The invention relates to the technical field of high-voltage insulation, in particular to a resistivity testing device for a solid insulating material under the action of liquid permeation.

Background

Typically, insulating materials are used to insulate components of an electrical system from each other and from ground, and resistivity is one of the most fundamental performance parameters of an insulating material.

During operation, the insulating material can be subjected to liquid intrusion in a humid environment, the resistivity of the insulating material can be changed, and certain influence is caused on the service performance of the insulating material. In order to study the effect of liquid intrusion on the resistivity of solid insulation materials, it is necessary to test the resistivity of solid materials under the action of liquid penetration. At present, the common method is to soak the insulating material in the liquid for a certain time, take out the insulating material and wipe the residual liquid on the surface clean, and then measure the volume resistivity or surface resistivity of the material by using the three-electrode method specified in GB/T1410-. Because a certain time is needed for testing the resistivity, some materials with slower polarization can be stable only by testing the test data for hours or even days, and liquid invading into the materials is likely to be separated out in the process, so that the accuracy of the test data is influenced.

In order to measure the resistivity of the solid material and simultaneously maintain the state of liquid invasion, and simultaneously, in order to monitor the change condition of the resistivity of the material in real time in the liquid invasion process, a set of special devices needs to be designed for realization.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the invention aims to provide a device for testing the resistivity of a solid insulating material under the action of liquid permeation.

In order to achieve the above object, an embodiment of the present invention provides a resistivity testing apparatus for a solid insulating material under liquid permeation, including: the metal screen comprises a base, a top cover part and a metal screen, wherein the base comprises a three-leg support, a base main body, a circular inner electrode, an annular outer electrode, a polytetrafluoroethylene insulating part and a screw post, the three-leg support is arranged at the bottom of the base main body and used for supporting the three-leg support, the top cover part comprises a top cover and an upper electrode, and the top cover part is connected with the metal screen through the upper electrode.

The resistivity testing device for the solid insulating material under the action of liquid permeation in the embodiment of the invention particularly relates to an innovative technology in the aspects of testing and evaluating the performance of the insulating material, can keep the state of liquid intrusion while measuring the resistivity of the solid material, and can realize real-time monitoring of the change condition of the resistivity of the material in the liquid intrusion process.

In addition, the resistivity testing device for solid insulating materials under the action of liquid permeation according to the embodiment of the invention can also have the following additional technical characteristics:

further, in an embodiment of the present invention, the base body is circular in a top view, has a U-shaped longitudinal section, and has threads inside both sides of the U-shaped section.

Further, in an embodiment of the present invention, the annular outer electrode, the teflon insulator, and the circular inner electrode are embedded in the bottom of the base body from outside to inside in sequence.

Further, in an embodiment of the present invention, the annular outer electrode and the circular inner electrode are respectively connected to the screw terminal for connecting a test line, and are insulated from each other by the teflon insulating member.

Further, in an embodiment of the present invention, the top cover is circular, the cross section of the top cover is an inverted U shape, the outer diameters of both sides of the inverted U shape are identical to the inner diameters of both sides of the U shape of the base main body, and the lower portions of both sides of the inverted U shape are provided with threads to match with the threads inside both sides of the U shape of the base main body.

Further, in one embodiment of the invention, the top of the top cover is provided with five threaded holes, water injection holes and vent holes which are distributed in a cross shape, screw terminals are screwed in the threaded holes respectively for wiring, the water injection holes are used for injecting water, and the vent holes are used for keeping the air pressure inside and outside the cavity balanced during water injection.

Further, in one embodiment of the present invention, the metal screen is circular, and the diameter of the circular metal screen is smaller than the inner diameter of the two sides of the inverted U-shape of the top cover and smaller than the outer diameter of the annular outer electrode.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic cross-sectional view of a solid insulation resistivity test apparatus under liquid permeation in accordance with one embodiment of the present invention (nuts and washers for wiring are not shown);

fig. 2 is a top view of a top cover of a solid insulation resistivity testing apparatus under liquid permeation in accordance with one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The resistivity testing device of the solid insulating material under the liquid permeation proposed by the embodiment of the invention is described below with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a resistivity testing apparatus for a solid insulation material under liquid permeation according to an embodiment of the present invention.

As shown in fig. 1, the apparatus 10 includes: a base 100, a top cover portion 200, and a metal screen 300.

The base 100 comprises a three-leg support 101, a base main body 102, a circular inner electrode 103, an annular outer electrode 104, a polytetrafluoroethylene insulator 105 and a screw post 106, the three-leg support 101 is arranged at the bottom of the base main body 102 and used for supporting the three-leg support 101, the top cover part 200 comprises a top cover 201 and an upper electrode 202, and the top cover part 200 is connected with the metal screen 300 through the upper electrode 202.

Further, the base main body 102 is circular in plan view, the longitudinal section of the base main body is U-shaped, threads are arranged inside two sides of the U-shape, an annular outer electrode 104, a polytetrafluoroethylene insulating member 105 and a circular inner electrode 103 are sequentially embedded into the bottom of the base main body 102 from outside to inside, wherein the annular outer electrode 104 and the circular inner electrode 103 are both made of metal, the annular outer electrode 104 and the circular inner electrode 103 are respectively connected with a screw terminal 106 for connecting a test wire, and the annular outer electrode 104 and the circular inner electrode are insulated from each other by the polytetrafluoroethylene insulating member. The other part of the base is made of an insulating material such as perspex.

Further, the top cover 201 is circular, the cross section is an inverted U shape, the outer diameters of both sides of the inverted U shape are the same as the inner diameters of both sides of the U shape of the base main body 102, and the lower portions of both sides of the inverted U shape have threads to match with the threads inside both sides of the U shape of the base main body 102. Meanwhile, as shown in fig. 2, the top of the top cover 201 has five threaded holes 2011, water injection holes 2012 and vent holes 2013 distributed in a cross shape, and metal screws are screwed in the five threaded holes 2011 respectively to serve as the upper electrode 202 for wiring, it can be understood that the upper electrode 202 is 5 metal screw terminals, the water injection holes 2012 are used for injecting water, and the vent holes 2013 are used for keeping the air pressure balance inside and outside the cavity during water injection. It should be noted that the top cover except the screw post is made of an insulating material such as plexiglas.

Further, the metal screen 300 is circular, has a flat surface and a proper mesh number, and is suitable for liquid to permeate, and the diameter of the circular screen is smaller than the inner diameter of the two sides of the inverted U-shaped top cover and smaller than the outer diameter of the annular outer electrode.

The working process of the resistivity testing device of the solid insulating material under the action of liquid permeation comprises the following steps: the test piece with moderate thickness is selected, and the diameter of the test piece is larger than that of the metal sieve 300 and smaller than the inner diameter of the two sides of the inverted U-shaped top cover 201. The metal sieve is placed at the bottom of the U-shaped part of the base main body 102, the metal sieve 300 is placed on the upper surface of the base main body, then the top cover 201 is screwed, and the five screws on the top cover 201 are screwed downwards until the metal sieve 300 is pressed on a test piece firmly, and meanwhile, the stress of five contact points is kept uniform. Then, liquid is injected through the water injection holes 2012, and the liquid contacts with the upper surface of the test sample through the holes of the metal sieve 300, so that a single-side permeation process occurs. When the resistivity is measured, the high-voltage lead, the measuring lead and the shielding lead of a megger or other testing devices are respectively connected with two screw terminals of the base and one screw terminal of the top cover according to the wiring method of GB/T1410-2006, and the resistivity can be measured while liquid invades. As the metal sieve has enough sieve pores, the permeation of liquid and the uniformity of the electric field on the surface of the sample can be ensured.

The resistivity testing device for the solid insulating material under the liquid permeation effect, provided by the embodiment of the invention, is ingenious in conception, novel in design and strong in practicability, can effectively solve the problem that a test article needs to be taken out of liquid in the resistivity testing process, and can be widely applied to testing of influences of liquid invasion on the resistivity of the solid insulating material.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.