CN103674786B - Permeability tester under electric field action - Google Patents

Abstract

The present invention proposes a permeability test device under the action of an electric field, comprising: a test piece fixing base, which is used to support the test piece; The test piece fixing base is connected and/or the test piece supported on the test piece fixing base is pressed to close the lower opening of the holding tube; the cover is used to cover the upper end of the holding tube; the first electrode, the first The electrode is located above the test piece; the second electrode is located below the test piece; the high voltage power supply is connected to the first electrode and the second electrode so as to apply an electric field to the test piece through the first electrode and the second electrode. The invention can effectively solve the problem that the electric field cannot be applied simultaneously and meet the weighing method in the existing liquid penetration test process, and has the advantages of ingenious design, simple operation and the like.

Description

Permeability test device under electric field

technical field

The invention belongs to the technical field of high-voltage insulation, and in particular relates to a permeability test device under the action of an electric field.

Background technique

my country's energy resources are mainly distributed in the central and western regions, while the load centers are mainly distributed in the southeast coastal areas. Therefore, large-capacity and long-distance UHV AC and DC power transmission technology is the key technology to solve the inconsistency between my country's energy centers and load centers.

Composite insulators are an important part of overhead transmission lines. In terms of electricity, composite insulators must withstand the effects of long-term operating voltage and transient operating overvoltage and lightning overvoltage; in terms of mechanics, composite insulators must bear the long-term Mechanical loads and other loads in weather conditions such as high winds and icing. In addition, composite insulators must also have good weather resistance and aging resistance to ensure that composite insulators can operate stably and reliably under various harsh weather conditions. The performance of composite insulators is directly related to the power system. Safe and stable operation.

The fracture accident of composite insulator is extremely harmful to the power system. In the study of composite insulator fracture, the liquid medium contacting the core rod of composite insulator is a necessary condition for fracture. Therefore, the process of the liquid medium penetrating the silicone rubber sheath and contacting the mandrel is a key issue in the research field of composite insulators. At present, some scholars have studied the permeation process of liquid in silicone rubber materials, mainly using weighing method and optical observation method to study the penetration characteristics of liquid medium in silicone rubber materials.

In the field of permeation research, the commonly used weighing method is to completely immerse the test sample in a specific liquid, and use a high-precision electronic balance to measure the mass change of the test sample at specific time intervals, and use this as the characteristic quantity to study the permeation process. However, factors that cannot apply an electric field when studied by the weighing method can only obtain the permeability characteristics of the liquid under the condition of no electric field.

The optical observation method refers to using a liquid with dyeing properties, immersing the sample completely or half in the liquid, taking out the sample to be tested at a specific time interval, dissecting the sample and observing the penetration depth of the dyed liquid, as a characteristic Quantitative study of the osmosis process. However, when using the optical observation method to study, although the effect of an electric field can be applied, only liquids with dyeing properties can be used, and the penetration characteristics of colorless liquids such as water and salt solutions in silicone rubber materials cannot be obtained. The required test samples are more and the procedure is complicated.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art.

For this reason, the object of the present invention is to propose a kind of permeability test device under the action of electric field.

In order to achieve the above object, according to an embodiment of the present invention, the permeability test device under the action of an electric field includes: a test piece fixing base, which is used to support the test piece; a holding cylinder, which is used for Hold the penetrating liquid, the lower end of the holding cylinder is connected to the test piece fixing base and/or compresses the test piece supported on the test piece fixing base to close the lower opening of the holding cylinder; a cylinder cover, the cylinder cover is used to cover the upper end of the holding cylinder; a first electrode, the first electrode is located above the test piece; a second electrode, the second electrode is located on the test piece and a high-voltage power supply connected to the first electrode and the second electrode so as to apply an electric field to the test piece through the first electrode and the second electrode.

The permeability test device under the action of an electric field according to the embodiment of the present invention can effectively solve the problem that the electric field action cannot be applied at the same time and meet the weighing method in the existing liquid penetration test process, and has the advantages of ingenious design and simple operation.

In addition, the permeability test device under the action of an electric field according to the embodiment of the present invention also has the following additional technical features:

In one embodiment of the present invention, the first electrode and the second electrode are planar electrodes.

In one embodiment of the present invention, it also includes: a first electrode centering and fixing device, the first electrode is installed on the first electrode centering and fixing device; a second electrode centering and fixing device, the The second electrode is installed on the second electrode centering and fixing device, wherein the first electrode and the second electrode are aligned with the center of the second electrode centering and fixing device through the first electrode centering and fixing device .

In one embodiment of the present invention, the second electrode is in contact with the test piece supported on the test piece fixing base.

In one embodiment of the present invention, the test piece fixing base has a through hole penetrating in the up and down direction, the inner wall of the through hole has an annular boss for supporting the test piece, and the holding cylinder The lower end fits in the through hole.

In one embodiment of the present invention, the lower end of the containing cylinder is screwed into the through hole and presses the test piece.

In one embodiment of the present invention, there is an air gap between the second electrode and the specimen fixing base.

In one embodiment of the present invention, the first electrode centering and fixing device is installed on the cylinder cover.

In one embodiment of the present invention, the material of the holding cylinder is plexiglass.

In one embodiment of the present invention, the first electrode and the second electrode are titanium electrodes.

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

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the schematic diagram of the permeability test device under the electric field action of the first embodiment of the present invention;

2 is a schematic diagram of a permeability test device under the action of an electric field according to a second embodiment of the present invention;

Fig. 3 is a schematic diagram of the permeability test device under the action of an electric field in the process of performing a penetration test according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of samples taken after the permeability test of the permeability test device under the action of an electric field according to the embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

According to an embodiment of an electric field, the permeability test device under the action of an electric field, as shown in Figure 1, may include: a specimen fixing base 1, a holding cylinder 2, a cylinder cover 3, a first electrode 4, and a second electrode 5 and high voltage power supply6. Wherein: the specimen fixing base 1 is used to support the specimen. The holding cylinder 2 is used to hold the permeate. The lower end of the holding tube 2 is connected to the test piece fixing base 1 and/or compresses the test piece supported on the test piece fixing base 1 to close the lower opening of the holding tube 2 . The cartridge cover 3 is used to cover the upper end of the containing cartridge 2 . The first electrode 4 is located above the test piece. The second electrode 5 is located below the test piece. The high voltage power supply 6 is connected to the first electrode 4 and the second electrode 5 so as to apply an electric field to the test piece through the first electrode 4 and the second electrode 5 .

The permeability test device under the action of an electric field according to the embodiment of the present invention can effectively solve the problem that the electric field action cannot be applied at the same time and meet the weighing method in the existing liquid penetration test process, and has the advantages of ingenious design and simple operation.

In one embodiment of the present invention, the first electrode 4 and the second electrode 5 are planar electrodes. Planar electrodes are conducive to the formation of a larger space and a more uniform distribution of the electric field. Usually circular plate electrodes are used.

In one embodiment of the present invention, as shown in Figure 2, it may also include: a first electrode centering and fixing device 7, the first electrode 4 is installed on the first electrode centering and fixing device 7; the second electrode pair Center and fixing device 8, the second electrode 5 is installed on the second electrode centering and fixing device 8, wherein the first electrode 4 and the second electrode 5 pass the first electrode centering and fixing device 7 and the second electrode centering and The fixtures 8 are aligned centrally. After the center of the first electrode 4 and the second electrode 5 are aligned, an electric field with a more uniform distribution can be generated.

In one embodiment of the present invention, the second electrode 5 is in contact with the test piece supported on the test piece fixing base 1 . The second electrode 5 is in direct contact with the test piece, which is beneficial for most electric field lines to pass through the test piece, and the electric field acts on the test piece in a concentrated manner.

In one embodiment of the present invention, the test piece fixing base 1 has a through hole penetrating in the up and down direction, the inner wall of the through hole has an annular boss for supporting the test piece, and the lower end of the holding cylinder 2 fits in the through hole. . This design can effectively position the test piece and at the same time make the test piece fixing base 1 and the holding cylinder 2 define a holding chamber.

In one embodiment of the present invention, the lower end of the holding cylinder 2 is screwed into the through hole and pressed against the test piece. The screw fit can better realize the compression of the test piece on the test piece fixing base 1 .

In one embodiment of the present invention, there is an air gap between the second electrode 5 and the specimen fixing base 1 . This can prevent the surface breakdown along the surface of the sample to be tested that may occur due to excessive electric field strength during the test.

In one embodiment of the present invention, the first electrode centering and fixing device 7 is installed on the cylinder cover 3 . It should be noted that a polytetrafluoroethylene sealing gasket may also be provided between the first electrode centering and fixing device 7 and the cylinder cover 3 to ensure good sealing.

In one embodiment of the present invention, the material of the holding cylinder 2 is organic glass. The plexiglass is transparent and visible, which is convenient for monitoring the situation in the cylinder, especially when observing the permeability of some colored penetrants in the test piece under the action of an electric field.

In one embodiment of the present invention, the first electrode 4 and the second electrode 5 are titanium electrodes. Titanium electrodes have the advantages of corrosion resistance, stability and reliability.

In order for those skilled in the art to better understand the present invention, the working process of the permeability test device under the action of an electric field according to an embodiment of the present invention will be described below with reference to FIG. 3 and FIG. 4 .

Firstly, a rubber test piece with matching size is placed on the annular boss on the inner wall of the through hole of the test piece fixing base 1 . The lower end of the storage tube 2 is connected with the test piece fixing base 1 through threads and pressed against the edge of the rubber test piece to fix the rubber test piece. At this time, the containing cylinder 2 and the rubber test piece form a containing cavity, and an appropriate amount of penetrant is injected (subject to the ability to immerse the first electrode in the future).

Secondly, the first electrode 4 is fixed on the cylinder cover 3 through the first electrode fixing and centering device 7, and is in close contact with the polytetrafluoroethylene gasket to meet the sealing requirements. Then the cylinder cover 3 is installed on the upper opening of the storage cylinder 2 .

Again, the second electrode 5 is positioned and fixedly installed by the second electrode fixing and centering device 8, so that the upper surface of the second electrode 5 is in contact with the lower surface of the rubber test piece. The reserved air gap ensures that the second electrode 5 is not in contact with the specimen fixing base 1, effectively avoiding surface breakdown along the lower surface of the specimen under a high-intensity electric field.

Finally, the first electrode 4 and the second electrode 5 are connected to a high-voltage power source 6 .

The installation process of the permeability test device under the action of the electric field is shown in Figure 3.

After the penetration test has been carried out for a period of time, the rubber test piece needs to be taken out and weighed. When taking the test piece, refer to Figure 4. The specific steps are as follows:

First, disconnect the high-voltage power supply, and then turn the main body of the device upside down as a whole. At this time, the penetrant no longer contacts the rubber test piece, but is contained in the storage cavity formed by the storage tube 2 and the tube cover 3 .

Secondly, the screw thread between the test piece fixing base 1 and the holding cylinder 2 is twisted, and the rubber test piece can be taken out for weighing.

After the weighing, if the permeability test is still required, just continue to repeat the above steps.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature indirectly through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. a permeability tester under electric field action, is characterized in that, comprising:

Test specimen firm banking, described test specimen firm banking is for supporting test specimen;

Hold cylinder, described in hold cylinder for holding penetrating fluid, described in hold cylinder lower end be connected with described test specimen firm banking and compress and be supported on described test specimen on described test specimen firm banking to hold the under shed of cylinder described in closing;

Cover, described cover is used for the upper end holding cylinder described in capping;

First electrode, described first electrode is positioned at the top of described test specimen;

Second electrode, described second electrode is positioned at the below of described test specimen; And

High-voltage power supply, described high-voltage power supply and described first electrode are connected with the second electrode to apply electric field by described first electrode and the second electrode to described test specimen.

2. permeability tester under electric field action according to claim 1, is characterized in that, described first electrode and described second electrode are plane electrode.

3. permeability tester under electric field action according to claim 1, is characterized in that, also comprises:

The first electrode pair heart and stationary installation, described first electrode is arranged in the described first electrode pair heart and stationary installation;

The second electrode pair heart and stationary installation, described second electrode is arranged in the described second electrode pair heart and stationary installation, and wherein said first electrode and the second electrode are by the described first electrode pair heart and stationary installation and the second electrode pair heart and the alignment of stationary installation center.

4. permeability tester under electric field action according to claim 1, is characterized in that, described second electrode contacts with the test specimen be supported on described test specimen firm banking.

5. the permeability tester under electric field action according to any one of claim 1-4, it is characterized in that, described test specimen firm banking has through hole through along the vertical direction, the inwall of described through hole has the annular boss for supporting described test specimen, described in hold cylinder lower end be engaged in described through hole.

6. permeability tester under electric field action according to claim 5, is characterized in that, described in hold cylinder lower end threaded engagement in described through hole, compress described test specimen.

7. permeability tester under electric field action according to claim 6, is characterized in that, has clearance between described second electrode and described test specimen firm banking.

8. permeability tester under electric field action according to claim 3, is characterized in that, the described first electrode pair heart and stationary installation are arranged on described cover.

9. permeability tester under electric field action according to claim 1, is characterized in that, described in hold cylinder material be machine glass.

10. permeability tester under electric field action according to claim 1, is characterized in that, described first electrode and the second electrode are Ti electrode.