CN110879120B - Simulation structure of composite insulation structure, interface sealing performance test system and method - Google Patents
Simulation structure of composite insulation structure, interface sealing performance test system and method Download PDFInfo
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- 238000007789 sealing Methods 0.000 title claims abstract description 143
- 238000004088 simulation Methods 0.000 title claims abstract description 105
- 239000002131 composite material Substances 0.000 title claims abstract description 86
- 238000009413 insulation Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011056 performance test Methods 0.000 title claims description 48
- 238000012360 testing method Methods 0.000 claims abstract description 75
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 239000002274 desiccant Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000008213 purified water Substances 0.000 claims abstract description 42
- 229920001971 elastomer Polymers 0.000 claims description 62
- 238000001514 detection method Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 2
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
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- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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Abstract
The invention relates to a simulation structure of a composite insulation structure, and a system and a method for testing interface sealing performance. The interface sealing performance testing method comprises the steps of preparing a simulation structure of the composite insulation structure, providing a testing environment through a liquid container, purified water and a temperature control device, sealing a drying agent in the simulation structure, and placing the simulation structure in the testing environment. According to the interface sealing performance testing method, the interface sealing performance of the simulation structure can be obtained by comparing the mass difference value of the drying agent before and after the drying agent enters the testing environment, and further the sealing performance of the composite insulation structure is obtained. Therefore, the interface sealing performance of the composite insulating structure under different environments can be obtained.
Description
Technical Field
The invention relates to a sealing performance test of a composite insulating structure, in particular to a simulation structure of the composite insulating structure, an interface sealing performance test system and an interface sealing performance test method.
Background
The insulating composite structure refers to a composite structure formed by compositing different insulating devices. Composite insulation structures formed from dual layers of insulating materials are widely used in electrical devices.
The inventor finds in research that the composite interface of the composite insulation structure is a weak part of the power equipment. Poor sealing at the composite interface can lead to moisture ingress, resulting in electrical discharge or dielectric breakdown at the composite interface.
The inventor finds out in the process of realizing the conventional technology that: the traditional technology lacks a method for testing the sealing performance of a composite interface of a composite insulating structure.
Disclosure of Invention
Therefore, it is necessary to provide a simulation structure of a composite insulation structure, an interface sealing performance testing system and an interface sealing performance testing method, for solving the problem that the sealing performance testing method for the composite interface of the composite insulation structure is lacked in the conventional technology.
An interface sealing performance test method is used for carrying out interface sealing performance test on a composite insulating structure, and comprises the following steps:
preparing a simulation structure of the composite insulation structure;
providing a liquid container, and injecting purified water with a preset height into the liquid container;
providing a temperature control device to control the temperature of the purified water;
sealing a drying agent in the simulation structure, and placing the simulation structure sealed with the drying agent in the liquid container and at the bottom of the liquid container;
after a period of time, taking out the simulation structure, and taking out the drying agent sealed in the simulation structure;
and acquiring the quality difference of the drying agent, and acquiring the interface sealing performance of the simulation structure according to the quality difference to be used as the interface sealing performance of the composite insulation structure.
In one embodiment, the method for preparing a composite insulation structure comprises the following steps:
providing a cylindrical insulating rod comprising a first end, a second end, and an intermediate portion between the first and second ends;
hollowing out the intermediate portion to form a receiving cavity;
providing hollow elastic rubber to be sleeved on the surface of the cylindrical insulating rod; the elastic rubber sleeve is arranged on the surface of the cylindrical insulating rod and covers the accommodating cavity to form the simulation structure.
In one embodiment, the sealing a desiccant within the dummy structure comprises:
placing the desiccant in a containing cavity;
sleeving the elastic rubber on the surface of the cylindrical insulating rod and coating the accommodating cavity; the length of the combination of the elastic rubber and the first end is equal to the length of the combination of the elastic rubber and the second end.
In one embodiment, the cylindrical insulating rod has a first rounded surface at a first end and a second rounded surface at a second end;
after the hollowing process is performed on the middle part to form the accommodating cavity, the method further comprises the following steps:
hollowing the first end from the first circular surface;
hollowing out the second end from the second circular surface.
In one embodiment, the filling of purified water with a preset height into the liquid container includes:
acquiring a preset pressure intensity of the interface sealing performance test;
according to the preset pressure intensity and p0＝ρgh0Calculating the preset height; wherein p is0The preset pressure for the interface sealing performance test is shown, and rho is the liquid density of the purified water; g is the acceleration of gravity; h is0Is the preset height of the purified water.
In one embodiment, the providing of the temperature control device to control the temperature of the purified water includes:
providing a temperature control device, and acquiring a preset temperature of the interface sealing performance test;
and adjusting the temperature control device according to the preset temperature to control the temperature of the purified water to be the preset temperature.
In one embodiment, the obtaining the interface sealing performance of the simulation structure according to the quality difference includes:
calculating the permeation speed of the purified water entering the simulation structure according to the mass difference of the drying agents;
the permeation rate was used to characterize the sealing performance of the simulated structure.
The interface sealing performance testing method comprises the steps of preparing a simulation structure of the composite insulating structure, providing a testing environment through providing a liquid container, purified water and a temperature control device, sealing a drying agent in the simulation structure, and placing the simulation structure in the testing environment. According to the interface sealing performance testing method, the interface sealing performance of the simulation structure can be obtained by comparing the mass difference value of the drying agent before and after the drying agent enters the testing environment, and further the sealing performance of the composite insulation structure is obtained. Therefore, the interface sealing performance of the composite insulating structure under different environments can be obtained.
A simulation of a composite insulation structure, comprising:
the cylindrical insulating rod comprises a first end, a second end and a middle part positioned between the first end and the second end, and the middle part is hollowed to form an accommodating cavity;
the elastic rubber is hollow and is sleeved on the surface of the cylindrical insulating rod, and the accommodating cavity is coated with the elastic rubber.
In one embodiment, the cylindrical insulating rod has a first rounded surface at a first end and a second rounded surface at a second end;
the cylindrical insulating rod is also provided with a first pit and a second pit, and the first pit is formed on the first round surface and extends towards the inside of the cylindrical insulating rod; the second pit is formed on the second circular surface and extends towards the inside of the cylindrical insulating rod.
The simulation structure of the composite insulation structure comprises the round insulation rod with the hollow middle part and the elastic rubber, and can simulate the crosslinked polyethylene main insulation-silicon rubber cold shrink tube composite insulation structure of the crosslinked polyethylene insulation cable. Therefore, the purpose of testing the sealing performance of the composite insulating structure can be achieved by testing the sealing performance of the simulation structure, and the interface sealing performance of the composite insulating structure in different environments can be further obtained.
An interface seal performance testing system, comprising:
a liquid container;
a temperature control device for controlling the temperature of the liquid in the liquid container;
the simulation structure of the composite insulation structure is used for sealing the drying agent, is placed in the liquid container and is used for carrying out sealing performance test;
and the balance is used for carrying out quality detection on the drying agent.
The interface sealing performance test system comprises a test environment, a simulation structure of a composite insulation structure and a balance, and can be applied to the interface sealing performance test method of the embodiment. According to the interface sealing performance testing system, the interface sealing performance of the simulation structure can be obtained by comparing the mass difference value of the drying agent before and after the drying agent enters the testing environment, and further the sealing performance of the composite insulation structure is obtained. Therefore, the interface sealing performance of the composite insulating structure under different environments can be obtained.
Drawings
Fig. 1 is a schematic flow chart of an interface sealing performance testing method according to an embodiment of the present application.
Fig. 2 is a schematic process flow diagram of step S100 of the method for testing the sealing performance of the interface according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a simulation structure according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a cylindrical insulating rod according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a liquid container according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a module of a temperature control device according to an embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. simulating a structure;
100. a cylindrical insulating rod;
110. a first end;
112. a first rounded surface;
114. a first pit;
120. a second end;
122. a second rounded surface;
124. a second pit;
130. an intermediate portion;
132. an accommodating chamber;
210. an elastic rubber;
30. a liquid container;
40. a temperature control device;
410. a controller;
420. a heater;
430. a temperature sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
An insulating composite structure refers to a composite structure formed by two different insulating devices being composited. The two different insulating devices may be the same insulating material or different insulating materials. In an electric power system, the insulating composite structure may be an insulator, which is a composite structure composed of a main cable insulating device and a cable accessory insulating device. When two different insulating materials form a composite structure, the interface of the composite structure is a composite interface. The sealing properties of the composite interface have a significant impact on the various properties of the composite insulation structure.
The application provides a simulation structure of a composite insulation structure, and a system and a method for testing interface sealing performance, so that the interface sealing performance of the composite insulation structure is represented, and the sealing performance of a composite interface of the composite insulation structure can be conveniently and visually known.
As shown in fig. 1, an interface sealing performance testing method is used for performing interface sealing performance testing on a composite insulating structure. The interface sealing performance testing method comprises the following steps:
s100, preparing a simulation structure of the composite insulation structure.
According to the interface sealing performance testing method, the sealing performance of the simulation structure is tested by testing the sealing performance of the simulation structure of the composite insulating structure, so that the interface sealing performance of the simulation structure is represented by the interface sealing performance of the simulation structure. Therefore, it is first necessary to prepare a dummy structure of the composite insulation structure.
When the simulation structure of the composite insulation structure is prepared, the material of the simulation structure and the material of the composite insulation structure can be completely the same, and the shape and the size are also the same or are reduced in the same proportion, so that the interface sealing performance of the simulation structure is similar to that of the composite insulation structure. Thus, the analog structure is also formed by compounding two insulating devices.
And S200, providing a liquid container, and injecting purified water with a preset height into the liquid container.
After the simulation structure of the composite insulation structure is prepared, a test environment for performing interface sealing performance test on the simulation structure is needed. In this application, the test environment should be capable of providing a specific temperature and pressure for the simulated structure. In the embodiments of the present application, the temperature required by the test environment to provide for the simulation structure is referred to as a preset temperature; the pressure required by the test environment to provide for the simulated structure is referred to as the preset pressure.
The provision of the preset temperature and the preset pressure may be achieved by a liquid. In this embodiment, a non-conductive liquid may be used to provide a predetermined temperature and a predetermined pressure for the analog structure. The non-conductive liquid here may be pure water.
Pure water may be contained by the liquid container. Generally, the liquid container can be made of a material with low thermal conductivity and good temperature resistance, such as polyethylene, polypropylene, etc., so as to prevent the performance of the liquid container from affecting the interface sealing performance test of the simulation structure. Meanwhile, the liquid container can be in a regular shape, such as a cylinder, a cube or a cuboid, and has a smooth inner wall, so that the influence of the liquid container on the interface sealing performance test structure is reduced as much as possible.
In this embodiment, the pressure of the test environment may be controlled by controlling the level of purified water injected into the liquid container.
And S300, providing a temperature control device to control the temperature of the purified water.
As known from the description of step S200, the test environment also needs to provide a preset temperature for the simulation structure. In this embodiment, the temperature of the purified water injected into the liquid container is the temperature of the test environment. Therefore, the temperature of the purified water can be controlled through the temperature control device, and a test environment with a preset temperature is provided for the simulation structure.
S400, sealing the drying agent in the simulation structure, and placing the simulation structure sealed with the drying agent in the liquid container and at the bottom of the liquid container.
Specifically, the interface sealing performance test is performed on the simulation structure, that is, the sealing performance test is performed on the interface of two insulating devices forming the simulation structure. In other words, the ability of water molecules to penetrate inside the dummy structure along the interface of the two insulating devices was tested. Therefore, the drying agent can be sealed in the simulation structure, and then the simulation structure sealed with the drying agent is placed in the test environment, so that the interface sealing performance test of the simulation structure is realized.
And S500, after a period of time, taking out the simulation structure, and taking out the drying agent sealed in the simulation structure.
S600, obtaining the quality difference of the drying agent, and obtaining the interface sealing performance of the simulation structure according to the quality difference to serve as the interface sealing performance of the composite insulation structure.
The interface sealing performance of the simulation structure can be reflected by the mass difference value before and after the drying agent enters the test environment. Therefore, after the simulation structure is taken out from the test environment and the drying agent in the simulation structure is taken out, the mass difference value before and after the drying agent enters the test environment can be obtained through weighing. According to the quality difference of the drying agent, the interface sealing performance of the simulation structure can be represented, and the interface sealing performance of the simulation structure can be used as the interface sealing performance of the composite insulation structure.
The interface sealing performance testing method comprises the steps of preparing a simulation structure of the composite insulating structure, providing a testing environment through providing a liquid container, purified water and a temperature control device, sealing a drying agent in the simulation structure, and placing the simulation structure in the testing environment. According to the interface sealing performance testing method, the interface sealing performance of the simulation structure can be obtained by comparing the mass difference value of the drying agent before and after the drying agent enters the testing environment, and further the sealing performance of the composite insulation structure is obtained. Therefore, the interface sealing performance of the composite insulating structure under different environments can be obtained.
In one embodiment, as shown in fig. 2, step S100 of the method for testing the sealing performance of the interface includes:
s110, providing a cylindrical insulating rod, wherein the cylindrical insulating rod comprises a first end, a second end and a middle part positioned between the first end and the second end.
The material of the cylindrical insulating rod may be the same as the insulating material of the component to be simulated of the insulating composite structure to be simulated. For example, the material of the cylindrical insulating rod may be polyethylene.
For convenience of description, the cylindrical insulating rod may be divided into a first end, a middle portion and a second end along a bus bar direction of the cylindrical insulating rod. The bus of the cylindrical insulating rod is a shortest connecting line from the edge of one bottom surface of the cylindrical insulating rod to the edge of the other bottom surface of the cylindrical insulating rod. The first end is one end of the cylindrical insulating rod close to one bottom surface of the cylindrical insulating rod; the second end is opposite to the first end and is one end part of the cylindrical insulating rod close to the other bottom surface of the cylindrical insulating rod. The intermediate portion is located between and adjacent to the first and second ends.
In the embodiment shown in fig. 2, the cylindrical insulating rod is divided by a dotted line to divide the cylindrical insulating rod into a first end, a middle portion and a second end. Here, the broken line indicates a non-existent line.
And S120, hollowing the middle part to form an accommodating cavity.
The middle part of the cylindrical insulating rod is hollowed out, so that a containing cavity for containing the drying agent is formed. Here, when the middle portion of the cylindrical insulating rod is hollowed out, the hollowed first end and the hollowed second end may be connected to each other by the remaining middle portion as shown in fig. 2. At this time, the removed intermediate portion forms an accommodation chamber.
In other embodiments, the intermediate portion may be cut directly, but the position of the intermediate portion may remain. At this time, the position of the middle portion can be used for forming the accommodating cavity.
S130, providing hollow elastic rubber to be sleeved on the surface of the cylindrical insulating rod; the elastic rubber sleeve is arranged on the surface of the cylindrical insulating rod, and a simulation structure is formed when the accommodating cavity is coated.
A hollow elastic rubber is provided. The hollow means that the longitudinal section of the elastic rubber is in a circular ring shape along the direction perpendicular to the generatrix direction of the elastic rubber. Therefore, the elastic rubber sleeve can be arranged on the surface of the cylindrical insulating rod. In this embodiment, the length of the bus bar of the elastic rubber, i.e. the length of the elastic rubber, should be greater than the length of the middle part, so that the accommodating cavity can be covered when the elastic rubber is sleeved on the surface of the cylindrical insulating rod.
The elastic rubber sleeve is arranged on the surface of the cylindrical insulating rod and covers the accommodating cavity, so that a simulation structure compounded by two insulating structures is formed. At this time, the bonding interface of the elastic rubber and the cylindrical insulating rod is the interface to be tested for the sealing performance test.
After the elastic rubber sleeve is arranged on the surface of the cylindrical insulating rod, the structural schematic diagram of the simulation structure can be shown in fig. 3.
In a preferred embodiment, the above-mentioned dummy structure has the same thickness at each position of the elastic rubber. Meanwhile, the inner diameter of the elastic rubber in a natural state is smaller than the diameter of the bottom surface of the cylindrical insulating rod, so that the elastic rubber is tightly combined with the cylindrical insulating rod through elastic force when being sleeved on the cylindrical insulating rod.
In one embodiment, the method for testing the sealing performance of the interface, wherein the step S400 of sealing the drying agent in the simulation structure, includes:
and S410, placing the drying agent in the accommodating cavity.
Before the elastic rubber sleeve is arranged on the cylindrical insulating rod, a drying agent is placed in a containing cavity formed by the cylindrical insulating rod and the middle part of the cylindrical insulating rod is dug. The cylindrical insulating rod should have been hollowed out to form a receiving cavity.
S420, sleeving the elastic rubber on the surface of the cylindrical insulating rod and coating the accommodating cavity; the length of the combination of the elastic rubber and the first end is equal to the length of the combination of the elastic rubber and the second end.
The elastic rubber sleeve is arranged on the surface of the cylindrical insulating rod and covers the accommodating cavity to form a simulation structure filled with a drying agent. In this embodiment, the length of the joint between the elastic rubber and the first end is equal to the length of the joint between the elastic rubber and the second end, as shown in fig. 3. At this moment, the combination length of elastic rubber and holding chamber both ends equals, can avoid influencing the test result because the combination area of elastic rubber and cylindrical insulating rod is different at different positions.
The combination length of the elastic rubber and the first end and the combination length of the elastic rubber and the second end can be adjusted according to the actual structure of the composite insulating structure, so that the interface sealing performance test result of the simulation structure is as close to the interface sealing performance test result of the composite insulating structure as possible.
In one embodiment, as shown in FIG. 4, the cylindrical insulating rod has a first rounded surface at a first end and a second rounded surface at a second end.
Specifically, the cylindrical insulating rod has two bottom surfaces which are planar. In the present embodiment, for convenience of description, the two bottom surfaces of the cylindrical insulating rod are respectively named a first circular surface and a second circular surface. Wherein the first circular surface is located at a first end of the cylindrical insulating rod; the second circular surface is located at the second end of the cylindrical insulating rod.
At this time, after step S120 in step S100, the method may further include:
s140, hollowing the first end from the first circular surface and hollowing the second end from the second circular surface.
The first end is hollowed out from the first circular surface to form a first pocket. In other words, the first recess extends from the first circular surface towards the second circular surface. Simultaneously, the second end is hollowed out from the second circular surface to form a second pocket. In other words, the second recess extends from the second circular surface towards the first circular surface. The positions of the first and second pits are shown in the embodiment shown in fig. 4, with the dashed lines representing lines that are not visible from the perspective of the illustration.
Further, the length of the first end is equal to the length of the second end, and the depth of the first pit is equal to the depth of the second pit. Therefore, in the process of testing the interface sealing performance, the two ends of the accommodating cavity of the simulation structure are affected by the temperature of the test environment the same.
Furthermore, the bottom surface of the first concave pit close to the middle part is a plane, and the depth of the first concave pit is equal to the length of the first end minus the thickness of the elastic rubber; meanwhile, the bottom surface of the second concave pit close to the middle part is also a plane, and the depth of the second concave pit is also equal to the length of the second end minus the thickness of the elastic rubber. Therefore, the thicknesses of the peripheries of the containing cavities can be the same, so that the peripheries of the containing cavities of the simulation structures are influenced by the temperature and the pressure of the test environment the same in the interface sealing performance test process, and the interface sealing performance test result of the simulation structures is close to the interface sealing performance of the composite insulation structure as far as possible.
In one embodiment, the filling of purified water with a preset height into the liquid container in step S200 includes:
s210, acquiring preset pressure for the interface sealing performance test.
As is known from the above description, the pressure provided by the test environment for the simulation structure is a preset pressure.
S220, according to the preset pressure intensity and p0＝ρgh0Calculating forecastSetting the height; wherein p is0The method comprises the following steps of (1) testing the interface sealing performance by using a preset pressure, wherein rho is the liquid density of purified water; g is the acceleration of gravity; h is0Is the preset height of the purified water.
And after the preset pressure for the interface sealing performance test is obtained, the preset height of injected pure water can be calculated according to the preset pressure. Thereby providing a predetermined pressure for the simulation structure by providing purified water. The relation between the height of the purified water and the pressure provided by the purified water is p0＝ρgh0And will not be described in detail.
In an embodiment, in the method for testing the sealing performance of the interface, step S300 includes:
s310, providing a temperature control device, and obtaining a preset temperature for the interface sealing performance test.
A temperature control device is provided, which in this embodiment may include a heater, a temperature sensor, and a controller. Wherein, the heater is electrically connected with the controller, thereby the controller can control the operation of the heater. The temperature sensor is used for detecting the temperature of the purified water and generating detection data. The temperature sensor is electrically connected with the controller so as to transmit detection data to the controller.
When the temperature control device works, the controller can be preset with a preset temperature for interface sealing performance test. Wherein, the controller can be a singlechip. The heater can be a resistance heater such as a heating rod. The temperature sensor may be an electronic thermometer.
And S320, adjusting the temperature control device according to the preset temperature to control the temperature of the purified water to be the preset temperature.
After the controller of the temperature sensor is preset with the preset temperature, the temperature sensor can acquire the temperature of the purified water in the liquid container and generate detection data to be transmitted to the controller. The controller can compare the detection data with a preset temperature, and if the temperature of the purified water represented by the detection data is lower than the preset temperature, the controller controls the heater to work. On the contrary, if the temperature of the purified water represented by the detection data is equal to or higher than the preset temperature, the controller does not control the heater to operate. Therefore, the temperature of the purified water can be stabilized near the preset temperature.
In one embodiment, the step S600 of obtaining the interface sealing performance of the simulation structure according to the quality difference includes:
s610, calculating the permeation speed of the purified water entering the simulation structure according to the mass difference of the drying agent.
Can be according to the formula
And calculating the permeation speed of the purified water entering the simulation structure. Wherein v isp,tThe permeation rate of purified water; m is0、m1The quality of the desiccant before and after the simulated structure enters the test environment is respectively. d is the diameter of the bar, namely the diameter of the first circular surface or the second circular surface. l is the length of the elastic rubber combined with the first end, or the length of the elastic rubber combined with the second end.
And S620, representing the sealing performance of the simulation structure by using the permeation speed.
After the permeation speed is obtained through calculation, multiple times of measurement can be carried out, and the permeation speed is analyzed, so that the interface sealing performance of the simulation structure under the preset temperature and the preset pressure can be obtained. The interface sealing performance of the simulation structure represented by the permeation speed can be used as the interface sealing performance of the composite insulation structure.
The present application also provides a simulated structure of a composite insulation structure, which may be as shown in fig. 3, comprising a cylindrical insulation rod and an elastic rubber.
The cylindrical insulating rod comprises a first end, a second end and a middle part positioned between the first end and the second end, and the middle part is hollowed to form an accommodating cavity. The material of the cylindrical insulating rod may be the same as the material of the portion to be simulated of the composite insulating structure, such as polyethylene or the like.
The elastic rubber is hollow and is sleeved on the surface of the cylindrical insulating rod, and the elastic rubber covers the accommodating cavity.
Further, as shown in fig. 3, when the elastic rubber is sleeved on the surface of the cylindrical insulating rod, the combination length of the elastic rubber and the first end is equal to the combination length of the elastic rubber and the second end. Here, the coupling length of the elastic rubber to the first end means a length of the elastic rubber covering the first end; the combined length of the elastic rubber and the second end refers to the length of the elastic rubber covering the second end.
The simulation structure of the composite insulation structure comprises a cylindrical insulation rod and elastic rubber sleeved on the surface of the cylindrical insulation rod, and can perform structural simulation on the composite insulation structure. When the interface sealing performance of the composite insulating structure needs to be tested, the interface sealing performance of the simulation structure can be tested, so that the interface sealing performance of the composite insulating structure is represented by the interface sealing performance of the simulation structure. Therefore, the situation that the composite insulation structure in the power system is taken down for the interface sealing performance test can be avoided, and the safety and convenience of the test are improved.
In one embodiment, as shown in FIG. 4, the cylindrical insulating rod has a first rounded surface at a first end and a second rounded surface at a second end.
Specifically, the first rounded surface is formed with first dimples extending from the first rounded surface to the second rounded surface. The second circular surface is formed with a second recess. The second dimples extend from the second circular surface to the first circular surface. Therefore, the influence of the weakened testing environment on the simulation structure caused by the overlong length of the first end and the second end can be weakened.
In one embodiment, the length of the first end is equal to the length of the second end and the depth of the first recess is equal to the depth of the second recess along the generatrix of the cylindrical insulator rod. Therefore, in the process of testing the interface sealing performance, the two ends of the accommodating cavity of the simulation structure are affected by the temperature of the test environment the same.
Further, the thickness of the elastic rubber is the same at different positions. The bottom surface of the first pit, which is close to the middle part, is a plane, and the depth of the first pit is equal to the length of the first end minus the thickness of the elastic rubber; meanwhile, the bottom surface of the second concave pit close to the middle part is also a plane, and the depth of the second concave pit is also equal to the length of the second end minus the thickness of the elastic rubber. Therefore, the thicknesses of the peripheries of the containing cavities can be the same, so that the peripheries of the containing cavities of the simulation structures are influenced by the temperature and the pressure of the test environment the same in the interface sealing performance test process, and the interface sealing performance test result of the simulation structures is close to the interface sealing performance of the composite insulation structure as far as possible.
In one embodiment, the inner diameter of the elastic rubber in a natural state is smaller than the diameter of the bottom surface of the cylindrical insulating rod, so that the elastic rubber is tightly combined with the cylindrical insulating rod through elastic force when being sleeved on the cylindrical insulating rod.
The present application further provides an interface sealing performance testing system, comprising a liquid container, a temperature control device, a simulation structure as in any of the above embodiments, and a balance.
Specifically, the liquid container is used for containing purified water, so that a test environment is provided for the interface sealing energy performance test. The liquid container can be made of materials with low heat conductivity coefficient and good temperature resistance, such as polyethylene, polypropylene and the like, so that the interface sealing performance test of the simulation structure is prevented from being influenced by the performance of the liquid container. Meanwhile, the liquid container can be in a regular shape, such as a cylinder, a cube or a cuboid, and has a smooth inner wall, so that the influence of the liquid container on the interface sealing performance test structure is reduced as much as possible.
The temperature control device is used for controlling the temperature of the liquid in the liquid container, thereby controlling the temperature of the testing environment. The temperature control device may include a heater, a temperature sensor, and a controller. Wherein, the heater is electrically connected with the controller, thereby the controller can control the operation of the heater. The temperature sensor is used for detecting the temperature of the purified water and generating detection data. The temperature sensor is electrically connected with the controller so as to transmit detection data to the controller.
When the temperature control device works, the controller can be preset with a preset temperature for interface sealing performance test. Wherein, the controller can be a singlechip. The heater can be a resistance heater such as a heating rod. The temperature sensor may be an electronic thermometer.
The simulation structure of the composite insulation structure is used for sealing the drying agent and is placed in the liquid container for sealing performance test. The analog structure of the composite insulating structure is the analog structure in any of the above embodiments, and is not described again.
And the balance is used for carrying out quality detection on the drying agent.
Further, in order to improve the test result of the interface sealing performance test of the application, a high-precision balance can be used for carrying out quality detection on the drying agent. For example, the measurement accuracy of the balance may be 0.0001 grams.
The interface sealing performance test system comprises a test environment, a simulation structure of a composite insulation structure and a balance, and can be applied to the interface sealing performance test method of the embodiment. According to the interface sealing performance testing system, the interface sealing performance of the simulation structure can be obtained by comparing the mass difference value of the drying agent before and after the drying agent enters the testing environment, and further the sealing performance of the composite insulation structure is obtained. The interface sealing performance test system can avoid taking down a composite insulation structure in an electric power system for interface sealing performance test, and improves the safety and convenience of test.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An interface sealing performance test method is used for carrying out interface sealing performance test on a composite insulating structure, and is characterized by comprising the following steps:
preparing a simulation structure of the composite insulation structure;
providing a liquid container, and injecting purified water with a preset height into the liquid container;
providing a temperature control device to control the temperature of the purified water;
sealing a drying agent in the simulation structure, and placing the simulation structure sealed with the drying agent in the liquid container and at the bottom of the liquid container;
after a period of time, taking out the simulation structure, and taking out the drying agent sealed in the simulation structure;
and acquiring the quality difference of the drying agent, and acquiring the interface sealing performance of the simulation structure according to the quality difference to be used as the interface sealing performance of the composite insulation structure.
2. The method for testing interfacial sealing performance according to claim 1, wherein the preparing a simulation structure of a composite insulation structure comprises:
providing a cylindrical insulating rod comprising a first end, a second end, and an intermediate portion between the first and second ends;
hollowing out the intermediate portion to form a receiving cavity;
providing hollow elastic rubber to be sleeved on the surface of the cylindrical insulating rod; the elastic rubber sleeve is arranged on the surface of the cylindrical insulating rod and covers the accommodating cavity to form the simulation structure.
3. The method for testing the sealing performance of the interface according to claim 2, wherein the sealing a desiccant in the simulation structure comprises:
placing the desiccant in a containing cavity;
sleeving the elastic rubber on the surface of the cylindrical insulating rod and coating the accommodating cavity; the length of the combination of the elastic rubber and the first end is equal to the length of the combination of the elastic rubber and the second end.
4. The interfacial sealing performance test method of claim 2, wherein said cylindrical insulating rod has a first rounded surface at a first end and a second rounded surface at a second end;
after the hollowing process is performed on the middle part to form the accommodating cavity, the method further comprises the following steps:
hollowing the first end from the first circular surface;
hollowing out the second end from the second circular surface.
5. The interface sealing performance testing method of claim 1, wherein the injecting purified water of a preset height into the liquid container comprises:
acquiring a preset pressure intensity of the interface sealing performance test;
according to the preset pressure intensity and p0＝ρgh0Calculating the preset height; wherein p is0The preset pressure for the interface sealing performance test is shown, and rho is the liquid density of the purified water; g is the acceleration of gravity; h is0Is the preset height of the purified water.
6. The interface sealing performance testing method of claim 1, wherein the providing a temperature control device to control the temperature of the purified water comprises:
providing a temperature control device, and acquiring a preset temperature of the interface sealing performance test;
and adjusting the temperature control device according to the preset temperature to control the temperature of the purified water to be the preset temperature.
7. The method for testing the interface sealing performance according to claim 1, wherein the obtaining the interface sealing performance of the simulation structure according to the quality difference comprises:
calculating the permeation speed of the purified water entering the simulation structure according to the mass difference of the drying agents;
the permeation rate was used to characterize the sealing performance of the simulated structure.
8. A simulation structure of a composite insulation structure, comprising:
a cylindrical insulating rod comprising a first end, a second end, a middle portion between the first end and the second end, a first rounded surface at the first end, and a second rounded surface at the second end, the middle portion hollowed out to form a receiving cavity;
the cylindrical insulating rod is also provided with a first pit and a second pit, the first pit is formed on the first circular surface and extends towards the inside of the cylindrical insulating rod, and the bottom surface of the first pit, which is close to the middle part, is a plane; the second pits are formed in the second round surface and extend towards the interior of the cylindrical insulating rod;
the elastic rubber is hollow and is sleeved on the surface of the cylindrical insulating rod, and the accommodating cavity is coated with the elastic rubber.
9. An interface seal performance testing system, comprising:
a liquid container;
a temperature control device for controlling the temperature of the liquid in the liquid container;
a simulated structure of a composite insulation structure as claimed in claim 8, used for sealing desiccant and placed in said liquid container for sealing performance test;
and the balance is used for carrying out quality detection on the drying agent.
10. The system of claim 9, wherein the temperature control device comprises: heater, temperature sensor and controller, the heater with the controller electricity is connected, temperature sensor and search the book controller electricity and connect, wherein:
the temperature sensor is used for detecting the temperature of the purified water in the liquid container, generating detection data and transmitting the detection data to the controller;
the controller is used for receiving the transmitted detection data and controlling the heater to work or stop working according to the detection data;
and the heater is used for heating or stopping heating the liquid container Jining under the control of the controller.
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| CN111426591A (en) * | 2020-04-08 | 2020-07-17 | 上海众材工程检测有限公司 | Method and system for detecting sealing performance of aluminum honeycomb product |
| CN111856223B (en) * | 2020-06-23 | 2023-07-07 | 深圳供电局有限公司 | Composite interface partial discharge simulation system and composite interface partial discharge simulation method |
| CN114112206B (en) * | 2021-11-17 | 2024-04-16 | 广东电网有限责任公司广州供电局 | Composite insulation interface tightness detection device and evaluation method |
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