阅读说明：本技术 高原气象下变压器用密封件的测试方法及测试系统 (Method and system for testing sealing element for transformer under plateau weather ) 是由 邓集瀚 赵银山 郭纯海 谢益帆 田松丰 李强 高晗 冯小晓 杨洋 于 2021-07-23 设计创作，主要内容包括：本发明公开一种高原气象下变压器用密封件的测试方法及测试系统,方法包括以下步骤：将耐油密封件设置于连接组件的待密封处；将油引流至连接组件,将连接组件置于高原气象的测试环境；测试环境设置为具备预设温度和预设紫外波长的紫外线,且供应预设压力环境中,并持续预设时间段；经过多个连续的测试环境测试后,测量通过耐油密封件压接处泄漏出的油的质量并检测耐油密封件的裂纹长度；若泄漏油质量或密封件裂纹长度两者均符合对应的预设值则判定整体合格,其中一则不符合则判定整体不合格。该方法便于在高原气象的测试环境下进行耐油密封件的选型。系统模拟高原气象环境,便于筛选出密封性能和质量均合格的耐油密封件,过程简单快捷,成本低。(The invention discloses a method and a system for testing a sealing element for a transformer under plateau weather, wherein the method comprises the following steps: arranging an oil-resistant sealing element at a position to be sealed of the connecting assembly; guiding oil to the connecting assembly, and placing the connecting assembly in a plateau meteorological test environment; the testing environment is set to be ultraviolet with preset temperature and preset ultraviolet wavelength, and is supplied to a preset pressure environment for a preset time period; after a plurality of continuous testing environment tests, measuring the quality of oil leaked from the compression joint of the oil-resistant sealing element and detecting the crack length of the oil-resistant sealing element; and if the quality of the leaked oil or the crack length of the sealing element both accord with the corresponding preset values, judging that the whole is qualified, and if one of the qualities does not accord with the corresponding preset values, judging that the whole is unqualified. The method is convenient for the model selection of the oil-resistant sealing element in the test environment of plateau meteorology. The system simulates the plateau meteorological environment, is convenient for screening out the oil-resistant sealing elements with qualified sealing performance and quality, and has simple and rapid process and low cost.)

1. A method for testing a sealing element for a transformer under plateau weather is characterized by comprising the following steps:

arranging an oil-resistant sealing element at a position to be sealed of the connecting assembly;

guiding oil to the connecting assembly, and placing the connecting assembly in a plateau meteorological test environment;

the test environment is set to be ultraviolet with a preset temperature and a preset ultraviolet wavelength, is supplied to a preset pressure environment and lasts for a preset time period;

after a plurality of continuous testing environment tests, measuring the quality of the oil leaked from the compression joint of the oil-resistant sealing element and detecting the crack length of the oil-resistant sealing element, and when one of the quality of the leaked oil or the crack length of the oil-resistant sealing element does not meet a corresponding preset value, judging that the whole oil-resistant sealing element is unqualified; and if the quality of the leaked oil or the crack length of the oil-resistant sealing element both accord with the corresponding preset values, judging that the oil-resistant sealing element is integrally qualified.

2. The method of claim 1, further comprising, after the step of directing oil to the connection assembly, prior to the step of placing the connection assembly in a plateau weather testing environment:

air bubbles in the oil are discharged until the oil flowing out of the connecting assembly does not exist.

3. The method for testing the seal for the plateau meteorological transformer as recited in claim 1, wherein in the step of checking the crack length of the oil-resistant seal, the preset value of the crack length is 3mm, and if the crack length is less than 3mm, the quality is qualified, otherwise, the quality is not qualified.

4. The utility model provides a test system of sealing member for transformer under plateau meteorological which characterized in that includes:

the connecting assembly is used for arranging an oil-resistant sealing element at a position to be sealed of the connecting assembly;

the drainage piece is communicated with the connecting assembly and is used for draining oil to the connecting assembly;

the connecting assembly is arranged in the meteorological device, and the meteorological device is used for placing the connecting assembly in a test environment of plateau weather;

a measuring device for measuring the quality of oil leaking through the crimp of the oil resistant seal;

and the detection device is used for detecting the crack length of the oil-resistant sealing element.

5. The system for testing the sealing member for the plateau meteorological transformer as recited in claim 4, wherein the connecting assembly comprises a cover plate and a container member having a connecting port, the cover plate is covered on one end of the connecting port of the container member, a sealing member is clamped between the cover plate and the container member to form a sealing connection, and the drainage member is communicated with the container member.

6. The system of claim 5, wherein the connection assembly further comprises a flange connected to an outer wall of the container member, and the cover plate is connected to the container member via the flange.

7. The system for testing the sealing member for the plateau meteorological transformer as recited in claim 5, further comprising an oil tank for storing oil, a pressure stabilizing pump for pressurizing the oil, and an oil conservator for maintaining the oil tank full, wherein the pressure stabilizing pump is arranged in the oil tank, the oil tank is communicated with the container member through the drainage member, and the oil conservator is communicated with the oil tank.

8. The system for testing the sealing member for the plateau meteorological transformer as recited in claim 5, further comprising a vent plug, wherein the cover plate is provided with a vent hole, the vent plug is connected to an inner wall of the vent hole and communicated with the container member, and the vent plug is used for discharging bubbles in oil.

9. The system of claim 8, wherein the flow guide member is inclined such that an end of the flow guide member in communication with the container member faces the vent.

10. The system for testing the sealing member of the plateau meteorological transformer as recited in claim 8, further comprising an oil drain plug, wherein an oil drain port is formed at the bottom of the container member, the oil drain plug is connected to an inner wall of the oil drain port and is communicated with the container member, and the oil drain plug is used for draining oil of the container member.

Technical Field

The invention relates to the field of oil-resistant sealing test, in particular to a method and a system for testing a sealing element for a transformer under plateau weather.

Background

The oil-resistant sealing element is mainly used for sealing a flange of a power transformer, and if the sealing element at the flange sealing position is degraded, the problems of transformer oil seepage, water increase in the transformer, gas content increase, corrosion acceleration of an oil tank, internal discharge caused by failure acceleration of an insulating plate, even gas action and the like can be caused; meanwhile, the leakage oil of the sealing element at the flange joint can be discovered only by manual inspection, but most transformer substations are unattended, the inspection period is long, and the leakage oil cannot be issued and processed at the first time.

The power transformer is with resistant oily sealing member can bear great difference in temperature and strong ultraviolet under the plateau environment, and outside meteorological environment changes the grow, adds the inside oil pressure change that different periods transformer variable load leads to, can further accelerate resistant oily sealing member degradation. At present, according to JB/T8448.1-2018 part 1 of technical conditions of sealing products for transformer products: rubber seal goods "standard develops the sealing member lectotype, but transformer flange junction sealing member oil leakage defect under the plateau meteorological environment frequently and often not in time discover, causes great potential safety hazard for equipment.

Disclosure of Invention

The leakage oil defects of the sealing element at the flange connection part of the transformer in the plateau meteorological environment are frequent and often not found in time, so that great potential safety hazards are caused to equipment. Therefore, a testing method and a testing system for the sealing element for the transformer under the plateau meteorological conditions are needed to be provided, so that the oil-resistant sealing element can be conveniently selected under the plateau meteorological testing environment, the quality and the sealing performance of the oil-resistant sealing element can be ensured, and the operation risk of equipment is reduced.

The specific technical scheme is as follows:

on one hand, the application relates to a method for testing a sealing element for a transformer under plateau weather, which comprises the following steps:

arranging an oil-resistant sealing element at a position to be sealed of the connecting assembly;

guiding oil to the connecting assembly, and placing the connecting assembly in a plateau meteorological test environment;

the test environment is set to be ultraviolet with a preset temperature and a preset ultraviolet wavelength, is supplied to a preset pressure environment and lasts for a preset time period;

after a plurality of continuous testing environment tests, measuring the quality of the oil leaked from the compression joint of the oil-resistant sealing element and detecting the crack length of the oil-resistant sealing element, and when one of the quality of the leaked oil or the crack length of the oil-resistant sealing element does not meet a corresponding preset value, judging that the whole oil-resistant sealing element is unqualified; and if the quality of the leaked oil or the crack length of the oil-resistant sealing element both accord with the corresponding preset values, judging that the oil-resistant sealing element is integrally qualified.

When the test method of the sealing element for the transformer under the plateau weather is used, the oil-resistant sealing element is arranged at the to-be-sealed position of the connecting component, so that the to-be-sealed position of the connecting component is in sealing connection, and most of oil is blocked in the connecting component by the oil-resistant sealing element when the oil passes through the to-be-sealed position. Arrange coupling assembling in plateau meteorological test environment, after the time of predetermineeing, measure the crackle length of the quality of the oil leakage and resistant oily sealing member, whether qualified with the quality in order to judge this resistant oily sealing member's sealing performance, thereby realize the sealing performance and the quality of test resistant oily sealing member during operation under plateau meteorological environment, be convenient for carry out resistant oily sealing member's lectotype under plateau meteorological test environment, can guarantee resistant oily sealing member's whole qualified, the probability of transformer flange junction oil leak has been reduced, equipment operation risk has been reduced.

The technical solution is further explained below:

in one embodiment, after the step of guiding the oil to the connection assembly, before the step of placing the connection assembly in a test environment in plateau weather, the method further includes: air bubbles in the oil are discharged until the oil flowing out of the connecting assembly does not exist. Through the bubble in the play oil, form the air cavity in avoiding coupling assembling for coupling assembling is full by transformer oil completely, makes the crimping face of sealing member shutoff completely and oil contact.

In one embodiment, in the step of checking the crack length of the oil-resistant seal, the preset value of the crack length is 3mm, and if the crack length is less than 3mm, the quality is qualified, otherwise, the quality is unqualified.

On the other hand, this application still provides a test system of sealing member for transformer under plateau meteorological, includes:

the connecting assembly is used for arranging an oil-resistant sealing element at a position to be sealed of the connecting assembly;

the drainage piece is communicated with the connecting assembly and is used for draining oil to the connecting assembly;

the connecting assembly is arranged in the meteorological device, and the meteorological device is used for placing the connecting assembly in a test environment of plateau weather;

the measuring device is used for measuring the quality of oil leaked from the compression joint of the oil-resistant sealing element;

and the detection device is used for detecting the crack length of the oil-resistant sealing element.

This test system of sealing member for transformer under plateau meteorological conditions can simulate plateau meteorological environment through placing coupling assembling in meteorological device. After the oil-resistant sealing element is arranged at the position to be sealed of the connecting assembly to realize sealing connection, oil is introduced into the connecting assembly through the drainage piece, and after the oil level exceeds the preset time in the connecting assembly, the quality of the oil leaked from the compression joint of the oil-resistant sealing element is measured through the measuring device so as to judge whether the sealing performance of the oil-resistant sealing element is qualified. And discharging oil in the connecting assembly, disassembling the connecting assembly, and measuring the crack length of the oil-resistant sealing element to judge whether the quality of the oil-resistant sealing element is qualified. The oil-resistant sealing element with qualified sealing performance and quality can be screened out through the testing system of the sealing element for the transformer under plateau weather, the process is simple and rapid, and the cost is low.

In one embodiment, the connecting assembly comprises a cover plate and a container part with a connecting port, the cover plate is covered at one end of the connecting port of the container part, a sealing element is clamped between the cover plate and the container part to form a sealing connection, and the drainage element is communicated with the container part.

In one embodiment, the coupling assembly further comprises a flange connected to an outer wall of the container member, the cover plate and the container member being connected by the flange.

In one embodiment, the test system for the sealing element for the transformer in plateau meteorological conditions further comprises an oil tank for storing oil, a pressure stabilizing pump for pressurizing the oil and an oil storage cabinet for keeping the oil tank full, wherein the pressure stabilizing pump is arranged in the oil tank, the oil tank is communicated with the container element through the drainage element, and the oil storage cabinet is communicated with the oil tank. The oil in the oil tank is driven by the pressure stabilizing pump to flow into the container part through the drainage part, so that the oil can be conveniently drained when the test system of the sealing part for the transformer works under plateau weather, and the insulation and heat dissipation effects can be realized.

In one embodiment, the test system for the sealing element for the transformer under the plateau meteorological conditions further comprises an exhaust plug, an air release opening is formed in the cover plate, the exhaust plug is connected to the inner wall of the air release opening and communicated with the container element, and the exhaust plug is used for releasing air bubbles in oil.

In one embodiment, the drainage member is arranged obliquely so that one end of the drainage member, which is communicated with the container member, faces the air release opening. This drainage piece is towards the relief port for the direction of the oil orientation core vent of flow direction container spare is favorable to the core vent to carry out the exhaust.

In one embodiment, the test system for the sealing element for the transformer under the plateau meteorological conditions further comprises an oil drain plug, an oil drain port is formed in the bottom of the container part, the oil drain plug is connected to the inner wall of the oil drain port and communicated with the container part, and the oil drain plug is used for draining oil of the container part.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.

Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale.

FIG. 1 is a flowchart of a method for testing a seal for a transformer under plateau weather conditions according to an embodiment;

FIG. 2 is a flowchart of a method for testing a seal for a transformer under plateau weather conditions according to another embodiment;

fig. 3 is a schematic structural diagram of a test system of a sealing member for a transformer under plateau weather conditions according to an embodiment.

Description of reference numerals:

10. the test system of the sealing element for the transformer under plateau weather; 100. a connecting assembly; 110. a container member; 120. a cover plate; 200. a drainage member; 300. a meteorological device; 400. a collector; 500. an oil tank; 600. a pressure stabilizing pump; 700. a vent plug; 800. a valve; 900. a drain plug; 1000. an oil conservator.

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.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

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.

Referring to fig. 1, the invention provides a method for testing a sealing member for a transformer under plateau weather, which is realized based on a testing system 10 for the sealing member for the transformer under plateau weather. Referring to fig. 3, the system 10 for testing the sealing member of the transformer under the highland weather condition in one embodiment comprises a connecting assembly 100, a flow guide member 200, a weather device 300, a measuring device and a detecting device. The connecting assembly 100 is used for arranging an oil-resistant sealing element at a position to be sealed of the connecting assembly 100; the drainage piece 200 is communicated with the connecting assembly 100, and the drainage piece 200 is used for draining oil to the connecting assembly 100; the connecting assembly 100 is arranged in a meteorological device 300, and the meteorological device 300 is used for placing the connecting assembly 100 in a test environment of plateau weather; the measuring device is used for measuring the quality of oil leaked from the compression joint of the oil-resistant sealing element; the detection device is used for detecting the crack length of the oil-resistant sealing element.

The test system 10 of the sealing member for the transformer under plateau weather can simulate plateau weather environment by placing the connecting assembly 100 in the weather device 300. After the oil-proof sealing element is arranged at the position to be sealed of the connecting assembly 100 to realize sealing connection, oil is introduced into the connecting assembly 100 through the drainage piece 200, and after the oil level in the connecting assembly 100 exceeds the preset time, the quality of the oil leaked from the compression joint of the oil-proof sealing element is measured through the measuring device to judge whether the sealing performance of the oil-proof sealing element is qualified or not. And discharging the oil in the connecting assembly 100, disassembling the connecting assembly 100, and measuring the crack length of the oil-resistant sealing element to judge whether the quality of the oil-resistant sealing element is qualified. The oil-resistant sealing element with qualified sealing performance and quality can be screened out through the testing system 10 of the sealing element for the transformer under plateau weather, the process is simple and rapid, and the cost is low.

Specifically, the system 10 for testing a seal for a transformer under plateau weather conditions further comprises a controller, and the weather device 300 is controlled by the controller. Different pressures and meteorological environments are output by inputting instructions into the controller.

Referring to fig. 3, in some embodiments, the connection assembly 100 includes a cover plate 120 and a container member 110 having a connection port, the cover plate 120 is disposed at one end of the connection port of the container member 110, a sealing member is interposed between the cover plate 120 and the container member 110 to form a sealing connection, and the drainage member 200 is in communication with the container member 110.

Referring to fig. 3, in some embodiments, the connection assembly 100 further includes a flange connected to an outer wall of the container member 110, and the cover plate 120 is connected to the container member 110 through the flange. The tightness of the place to be sealed is improved by the flange connection.

It should be understood that the flange is made according to the national standard GB9112-9131-88, and the cover plate 120 matched with each type of flange is made. After the oil-proof sealing element is installed on the flange crimping surface, the flange crimping surface is tightly pressed by the cover plate 120 and then fixedly connected.

Referring to fig. 3, in some embodiments, the system 10 for testing the sealing member of the transformer in plateau weather further includes an oil tank 500 for storing oil, a pressure stabilizing pump 600 for pressurizing the oil, and an oil conservator 1000 for maintaining the oil tank 500 full, wherein the pressure stabilizing pump 600 is disposed in the oil tank 500, the oil tank 500 is communicated with the container member 110 through the drainage member 200, and the oil conservator 1000 is communicated with the oil tank 500. The oil in the oil tank 500 is driven by the pressure stabilizing pump 600 to flow into the container part 110 through the drainage part 200, so that the oil can be conveniently drained when the test system 10 for the sealing part for the transformer works under the plateau weather, and the insulation and heat dissipation effects can be realized.

Referring to fig. 3, in some embodiments, the system 10 for testing a sealing member for a transformer under plateau weather further includes a vent plug 700, a vent hole is opened on the cover plate 120, the vent plug 700 is connected to an inner wall of the vent hole and communicated with the container member 110, and the vent plug 700 is used for releasing bubbles in oil. Air bubbles in the oil can be discharged through the vent plugs 700, an air cavity is prevented from being formed in the flange, the flange is completely filled with transformer oil, and the pressure welding surface blocked by the sealing element is completely contacted with the oil.

Referring to fig. 3, in some embodiments, the drainage member 200 is disposed obliquely such that an end of the drainage member 200 communicating with the container member 110 faces the air release opening. The drainage member 200 is oriented toward the vent such that oil flowing toward the container member 110 is directed toward the vent plug 700 to facilitate venting of the vent plug 700. Preferably, the drainage member 200 is angled at 5 ° to the horizontal.

Specifically, the drainage member 200 is a quick coupling, one end of the drainage member 200 is communicated with the oil tank 500, the other end of the drainage member 200 is communicated with the container 110, and a valve 800 is disposed at one end of the drainage member 200 close to the oil tank 500, and the valve 800 is used for opening or closing the drainage member 200. When the oil-proof sealing member is connected between the container member 110 and the cover plate 120 in a sealing manner, the valve 800 is opened to allow the oil in the oil tank 500 to flow into the container member 110 through the drainage member 200 for testing, and when the testing is finished, the valve 800 is closed to isolate the container member 110 from the oil tank 500.

Referring to fig. 3, in some embodiments, the system 10 for testing a sealing member for a transformer under plateau weather further includes a drain plug 900, the bottom of the container member 110 is provided with a drain port, the drain plug 900 is connected to an inner wall of the drain port and communicated with the container member 110, and the drain plug 900 is used for draining the container member 110.

Preferably, this meteorological device 300 is the meteorological box, includes temperature regulating module, pressure regulating module, ultraviolet emitter, temperature measurement module and timing module in this meteorological device 300 to realize that this meteorological device 300 can adjust temperature, pressure, ultraviolet intensity and have timing operation function and temperature measurement function. The meteorological device 300 is provided with a door which is good in sealing and excellent in heat preservation performance and can be opened and closed, wherein the heating constant temperature control range is 5-70 ℃, the refrigeration constant temperature control range is-30-0 ℃, the upper position and the lower position of the ultraviolet emitter can be adjusted by adopting a light band arrangement mode, so that the ray emitted by the ultraviolet emitter can directly irradiate the oil-resistant sealing element, and the wavelength range of the emitted ultraviolet ray is 290-365 nm. The temperature measuring range of the temperature measuring module is-50 degrees to +100 degrees, and the sampling frequency is 100 Khz. The meteorological device 300 is fixed to the oil tank 500 by a threaded fastener. The inner wall of the meteorological box is provided with a rock wool board, and the lines and the pipelines are filled with glass wool fibers.

In particular, the measuring device is an electronic balance, not shown in the figures, which is arranged outside the meteorological device 300. The system 10 for testing the sealing member for the transformer under plateau weather further comprises a collector 400, wherein the collector 400 is arranged below the container member 110, so that oil leaked from the compression joint of the oil-resistant sealing member in the connecting assembly 100 can be collected by the collector 400. The mass of the collector 400 is 5g, which is marked as m0, after the test of the test system 10 of the sealing element for the transformer under the plateau weather is completed, the mass of the collector 400 is measured by an electronic balance to be m1, when (m1-m0)/m0 is less than 0.5%, the sealing performance of the oil-resistant sealing element is qualified, otherwise, the sealing performance is not qualified.

Alternatively, the detection device can adopt a machine vision system and can also adopt a ruler to carry out manual measurement.

Referring to fig. 1, the invention also provides a method for testing the sealing member for the transformer under the plateau weather, which comprises the following steps:

an oil-resistant sealing element is arranged at the position to be sealed of the connecting assembly 100;

draining oil to the connection assembly 100, and placing the connection assembly 100 in a plateau meteorological test environment;

the test environment is set to be ultraviolet with a preset temperature and a preset ultraviolet wavelength, is supplied to a preset pressure environment and lasts for a preset time period;

after a plurality of continuous testing environment tests, measuring the quality of the oil leaked from the compression joint of the oil-resistant sealing element and detecting the crack length of the oil-resistant sealing element, and when one of the quality of the leaked oil or the crack length of the oil-resistant sealing element does not meet a corresponding preset value, judging that the whole oil-resistant sealing element is unqualified; and if the quality of the leaked oil or the crack length of the oil-resistant sealing element both accord with the corresponding preset values, judging that the oil-resistant sealing element is integrally qualified.

When the testing method of the sealing element for the transformer under the plateau weather is used, the oil-resistant sealing element is arranged at the position to be sealed of the connecting component 100, so that the position to be sealed of the connecting component is in sealing connection, and most of oil is blocked in the connecting component 100 by the oil-resistant sealing element when the oil passes through the position to be sealed. Arrange coupling assembling 100 in plateau meteorological test environment, after through the default time, measure the crackle length of the quality of leaking out oil and resistant oily sealing member, whether qualified with the quality in order to judge this resistant oily sealing member's sealing performance, thereby realize the sealing performance and the quality of test resistant oily sealing member during operation under plateau meteorological environment, be convenient for carry out resistant oily sealing member's lectotype under plateau meteorological test environment, can guarantee resistant oily sealing member's quality and sealing performance, the probability of transformer flange junction oil leakage has been reduced, equipment operation risk has been reduced.

Because the difference in temperature is great under the plateau meteorological environment, the ultraviolet ray is stronger, through set up different preset time, preset pressure, preset ultraviolet wavelength, preset the simulation plateau meteorological environment that the temperature can be better at every scene to be convenient for select suitable model, guarantee this resistant oily sealing member's performance.

In some embodiments, after the step of draining the oil to the connection assembly 100, before the step of placing the connection assembly 100 in a test environment in a plateau weather, the method further comprises: no air bubbles are present in the oil until the oil flows out of the connection assembly 100. Through the bubble in the play oil, avoid forming the air cavity in the coupling assembling 100 for coupling assembling 100 is full by transformer oil completely, makes the crimping face of sealing member shutoff completely with oily contact.

In some embodiments, in the step of checking the crack length of the oil-resistant seal, the preset value of the crack length is 3mm, and the quality is qualified if the crack length is less than 3mm, and the quality is unqualified otherwise.

Referring to fig. 2, an embodiment of the present invention further provides a method for testing a sealing member for a transformer under plateau weather, including the following steps:

s10, selecting proper flanges and cover plates 120 according to the oil-resistant sealing piece sample, installing the oil-resistant sealing piece on the flanges of the container part 110, installing the cover plates 120 to realize sealing connection, and communicating the container part 110 with the drainage part 200;

s100, opening a valve 800 and an air release plug, enabling oil to enter the container component 110, and closing the air release plug after bubble-free oil flows out of the air release plug;

s150, measuring the initial mass m of the collector 400 through a measuring device₀The collector 400 is then disposed below the container member 110;

specifically, the collector 400 is provided in a cylindrical shape, and the collector 400 has a bottom with a radius of 1000mm, a height of 160mm, and an initial mass of 5g, and is made of lightweight oil-resistant plastic.

S200, placing the oil-resistant sealing element in a plateau meteorological test environment according to the size of the oil-resistant sealing element;

specifically, the national standard GB9112-9131-88 is consulted, if the nominal pressure of the flange of the model is 6bar, the test is carried out in a form of a pressing table, and the test is carried out from a scene 1 to a scene 20 in sequence. If the nominal pressure of the other types of flanges is x bar (x is 2.5, 10, 16, 20, 25), only the pressure columns are converted in equal proportion, and the rest parameters are not adjusted, for example, if x is 25, the pressure column values are all corrected 25/6 times, and a decimal number is retained. The duration time is in minutes, the pressure is in bars, the ultraviolet wavelength is in nm, the heating temperature is in centigrade, and the refrigerating temperature is in centigrade. The heating state and the cooling state are 1, which indicates on, and 0, which indicates off.

S300, after the plateau meteorological work is finished, measuring the mass m of the collector 400 through the measuring device₁Calculating (m1-m0)/m0, and if the value is less than 0.5%, the sealing performance of the oil-resistant sealing element is qualified, otherwise, the sealing performance is not qualified;

s350, closing the valve 800, opening the vent plug 700 and the drain plug 900, discharging oil from the container device 110, and detaching the flange and the end cover plate 120;

s400, checking the oil-resistant sealing joint cracks, recording the length of each crack, and if the total length of the cracks is less than 3mm, determining that the quality of the oil-resistant sealing member is qualified, otherwise, determining that the quality is unqualified;

s500, judging whether the oil-resistant sealing element measured in the steps S300 and S400 is integrally qualified if the quality and the sealing performance are qualified, and regarding the rest conditions as integrally unqualified.

Specifically, the plateau meteorological test environment has 20 scenes, each scene has different preset temperatures and preset pressures, and is supplied with different ultraviolet rays with preset ultraviolet wavelengths and lasts for different preset time periods. Through continuously testing from scene 1 to scene 20 to the plateau meteorological environment in different seasons of better simulation, the influence that the change of a plurality of scenes brought that makes this resistant oily sealing member can be complete is convenient for to the whole qualified screening of resistant oily sealing member.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some 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.