Transformer air clog detection device

Abstract

The utility model provides a transformer air clog detection device. The device is characterized in that a gas injection assembly injects gas into a tested object; the gas collection assembly is communicated with a tested object filled with a liquid medium, and the gas injection assembly can be injected into the tested object and then can be collected into the gas collection assembly, so that the gas clogging prevention performance and the gas path resistance condition of the tested object can be evaluated. Gas is quantitatively injected into the tested object through the gas injection assembly, the gas can be collected into the gas collection assembly after being injected into the tested object through the gas injection assembly, then the gas collection volume change curve of the gas collection assembly is determined, and the gas clogging prevention performance and the gas path resistance condition of the tested object are evaluated by combining the gas injection volume based on the gas injection assembly. The anti-air-clogging performance of the equipment oil tank is evaluated, whether the oil tank has air clogging or the air clogging degree of the oil tank is detected and evaluated, delayed judgment of faults or defects caused by air clogging is avoided, and the problem that air clogging amount of an existing oil tank and an ascending flanged base is not easy to detect due to air clogging dispersion is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer air trapping, in particular to a transformer air trapping detection device. Background Art

[0002] When an insulation fault occurs in oil-filled equipment such as transformers / converters and reactors, causing overheating or discharge, the generated gas should be able to quickly enter the gas relay, thereby issuing an alarm or trip signal in a timely manner. However, due to the structure and design of the oil tank, the gas generated by the fault often accumulates in certain local locations of the oil tank, resulting in gas traps. The gas fails to enter the gas relay in the early stages of the fault, delaying the fault alarm time, which leads to further expansion of the fault and creates greater safety hazards. Therefore, when designing the oil tank, it is necessary to try to keep the gas path short, the gas collection pipeline has a certain inclination angle, and reduce the resistance of the gas entering the gas relay. At the same time, it is required that gas traps should be avoided in the oil tank and the riser.

[0003] At present, there are no relevant standards at home and abroad to require the gas collection performance of oil tanks and risers, nor are there standard testing methods. In order to test whether the oil filling equipment, oil tanks and risers are structurally reasonable, it is necessary to establish corresponding testing means and methods to avoid the presence of a large amount of gas in the oil tank. Utility Model Content

[0004] In view of this, the utility model proposes a transformer air trap detection device, which aims to solve the problem that the air trap volume is difficult to detect in the existing oil tank and the elevated seat air trap dispersion.

[0005] The utility model proposes a transformer gas nest detection device, which comprises: a gas injection component, which is used to inject gas into the interior of a test product; a gas collecting component, which is used to connect the test product filled with a liquid medium, so that the gas injected into the test product by the gas injection component can be collected in the gas collecting component, and then the gas collection volume change curve of the gas collecting component is determined, so as to evaluate the anti-gas nest performance and gas path resistance of the test product in combination with the volume of gas injected into the test product by the gas injection component.

[0006] Furthermore, in the above-mentioned transformer air pocket detection device, the air injection component includes: an air source; a pressure air chamber, one end of which is connected to the air source, and the other end is used to connect to the test product, and the two ends of the pressure air chamber are respectively provided with an air filling valve and an air injection valve to respectively control the amount of gas added by the air source into the pressure air chamber and the amount of gas injected by the pressure air chamber into the test product.

[0007] Furthermore, in the above transformer gas trap detection device, the pressure chamber is connected to a pressure gauge for detecting the gas pressure in the pressure chamber.

[0008] Furthermore, in the above-mentioned transformer gas trap detection device, the gas injection component also includes: a gas injection control unit; wherein the gas injection control unit is respectively connected to the pressure gauge, the gas filling valve, and the gas injection valve, and is used to receive the gas pressure in the pressure gas chamber obtained by the pressure gauge, and control the gas filling valve and the gas injection valve based on the gas pressure in the pressure gas chamber, so as to perform quantitative gas injection into the test product.

[0009] Furthermore, in the above-mentioned transformer air trap detection device, the pressure air chamber is connected to the equipment hand hole of the test product through a gas injection pipeline, the pressure gauge and the gas injection valve are both arranged on the gas injection pipeline, and the pressure gauge is located between the pressure air chamber and the gas injection valve.

[0010] Furthermore, in the above transformer air trap detection device, the gas source is a high-pressure gas cylinder or a dry air generator.

[0011] Furthermore, in the above-mentioned transformer gas pocket detection device, the gas collecting component includes: a gas collection quantity measuring oil tank for storing liquid medium to simulate the oil pillow of the transformer; a gas collecting capsule, arranged in the liquid medium of the gas collection quantity measuring oil tank, for connecting to the test piece, so that the gas injected into the test piece by the gas injection component can be collected in the gas collecting capsule, thereby making the liquid level of the liquid medium in the gas collection quantity measuring oil tank increase with the increase of gas in the gas collecting capsule, so as to determine the gas collection amount in the gas collecting capsule based on the increase of the liquid medium liquid level.

[0012] Furthermore, in the above transformer gas trap detection device, a liquid level meter is connected to the gas collection amount measuring oil tank for detecting the liquid level of the liquid medium in the gas collection amount measuring oil tank.

[0013] Furthermore, in the above transformer air trap detection device, a desiccant is connected to the air collection amount measuring oil tank for connecting the air in the air collection amount measuring oil tank with the external air.

[0014] Furthermore, in the above transformer air trap detection device, a control valve is provided on the connecting pipeline between the air inlet of the air collecting component and the top air guide pipeline of the test product to control the connection between the air collecting component and the test product.

[0015] The utility model provides a transformer gas nest detection device, which quantitatively injects gas into the interior of a test object through a gas injection component, and collects gas through a gas collecting component, so that the gas injection component can be collected in the gas collecting component after being injected into the test object, and then the gas collection volume change curve of the gas collecting component is determined, so as to evaluate the anti-gas nest performance and gas path resistance of the test object in combination with the volume of gas injected into the test object by the gas injection component, so as to accurately evaluate the non-gas nest performance of the equipment tank, that is, the anti-gas nest performance, that is, to inspect and evaluate whether there is gas nesting in the oil tank or the degree of gas nesting in the oil tank, to provide a design basis for the structural design of the equipment, the design of the oil tank, the riser and the gas guide pipeline, to reduce the possibility of delayed alarm or missed reporting of faults caused by internal structural design defects of the oil tank when insulation defects occur in the transformer equipment, to avoid delayed judgment of faults or defects caused by gas nesting, so as to solve the problem that the gas nesting amount of the existing oil tank and the riser is not easy to detect. The device and method can simulate the actual installation and operating conditions of the test product to the greatest extent, solving the problem of difficult quantitative measurement of gas dispersion. The device and method can also be used in transformer manufacturing enterprises and test and inspection centers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of the structure of a transformer air trap detection device provided by an embodiment of the utility model;

[0018] Description of reference numerals:

[0019] 1-gas injection assembly, 11-gas source, 12-pressure gas chamber, 13-gas filling valve, 14-gas injection valve, 15-gas filling pipeline, 16-gas injection pipeline, 17-pressure gauge, 2-gas collection assembly, 21-gas collection volume measurement tank, 211-oil drain port, 22-gas collection capsule, 23-liquid level gauge, 24-dehumidifier, 3-test sample, 31-equipment hand hole, 4-transformer bushing, 5-control valve. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] See also Figure 1 , which is a schematic diagram of the structure of the transformer gas trap detection device provided by the embodiment of the utility model. As shown in the figure, the device includes: a gas injection component 1 and a gas collection component 2; wherein,

[0022] The gas injection component 1 is used to inject gas into the interior of the test sample 3; the gas collecting component 2 is used to connect to the test sample 3 so that the gas injected into the test sample 3 by the gas injection component 1 can be collected in the gas collecting component 2, and then the gas collection volume change curve of the gas collecting component is determined, so as to evaluate the anti-gas nesting performance and gas path resistance of the test sample based on the volume of gas injected into the test sample by the gas injection component.

[0023] Specifically, the gas outlet of the gas injection component 1 is connected to the equipment hand hole 31 of the test sample 3, and the equipment hand hole 31 is arranged at the bottom of the test sample 3; the gas inlet of the gas collecting component 2 is connected to the top gas guide pipeline of the test sample 3, so that the gas injected into the test sample 3 by the gas injection component 1 can flow upward through the gas guide pipeline and enter the interior of the gas collecting component 2 from the gas inlet of the gas collecting component 2. Based on the gas collection volume change curve of the gas collecting component 2, the gas collection volume and the time used by the gas collecting component 2 can be determined, that is, the gas collection volume of the gas collecting component 2 and the time used for the gas collecting component 2 to collect the maximum amount of gas can be determined, and the gas can be collected within a preset time period. Monitoring is performed to determine the gas collection volume of the gas collection component 2 and the time taken by the gas collection component 2 to collect the maximum amount of gas within a preset time period from the gas injection component 1 injecting gas into the test sample 3. Based on the gas injection volume of the gas injection component 1 and the gas collection volume of the gas collection component 2, according to a comparison between the two, it is determined whether there is air trap space in the test sample 3 and the amount of air trap in the test sample 3, and then the anti-air trap performance of the test sample is evaluated. That is to say, when the gas injection volume of the gas injection component 1 is equal to the gas collection volume of the gas collection component 2, there is no air trap space in the test sample 3, and the gas injection volume of the gas injection component 1 is larger than that of the gas collection component 2. When the gas volume is between the gas collection volume of the gas collection component 2, there is gas nesting space in the test product 3, and the gas nesting volume is the difference between the gas injection volume of the gas injection component 1 and the gas collection volume of the gas collection component 2, so as to evaluate the anti-gas nesting performance of the test product 3, and the larger the gas nesting volume, the worse the anti-gas nesting performance and the more serious the gas nesting problem. It is also possible to observe the gas volume collected by the gas collection component 2 and the time used, that is, the time to collect the maximum gas volume, within a preset time period, and then evaluate the resistance of the test product's gas path according to the gas collection speed. That is to say, the greater the resistance of the test product's gas path, the smaller the gas outlet speed of the test product, so the gas collection speed is The longer the time to collect the maximum gas volume, the slower the gas collection speed of the gas collection component 2, and the greater the resistance of the gas path of the test product. Conversely, the shorter the time to collect the maximum gas volume, the faster the gas collection speed of the gas collection component 2, and the greater the resistance of the gas path of the test product. Then, according to the anti-gas trap performance of the test product 3 and the resistance of the gas path of the test product 3, check whether the structure of the test product 3 is reasonable, so as to adjust the structure of the test product 3 to avoid a large amount of gas traps in the oil tank, thereby reducing the occurrence of delayed alarm or missed alarm of faults caused by internal structural design defects of the oil tank when insulation defects occur inside the transformer equipment. Among them, the preset time period can be determined according to the actual situation, for example, it can be determined according to experience combined with the conventional gas trap situation of the test product 3, and it is not limited in this embodiment.

[0024] In this embodiment, a control valve 5 is provided on the connecting pipeline between the gas inlet of the gas collection component 2 and the top gas guide pipeline of the test sample 3 to control the connection and disconnection between the gas collection component 2 and the test sample 3. The control valve 5 is opened before the gas injection component 1 injects gas into the test sample 3.

[0025] In this embodiment, the test object 3 can be any closed box that needs to be tested for anti-gas trap performance, such as a transformer oil tank including a transformer body or a transformer riser, that is, as a tested oil tank, the interior of which is filled with a liquid medium during the test, which can be insulating oil or other liquid medium, to simulate the operating conditions of the test object 3. The top of the test object 3 can also have a transformer bushing 4, and the gas collection component 2 can also simulate the oil pillow of the transformer to simulate the actual installation and operating conditions of the test object to the greatest extent.

[0026] Continue to see Figure 1 The gas injection assembly 1 includes: a gas source 11 and a pressure gas chamber 12; wherein one end of the pressure gas chamber 12 (such as Figure 1 The left end as shown) is connected to the gas source 11, and the other end (as shown Figure 1 The right end as shown in the figure is used to connect to the test sample 3, and the two ends of the pressure air chamber 12 are respectively provided with a gas filling valve 13 and a gas injection valve 14 to respectively control the amount of gas added into the pressure air chamber 12 by the gas source 11 and the amount of gas injected into the test sample 3 by the pressure air chamber 12.

[0027] Specifically, the left end of the pressure chamber 12 is connected to the gas source 11 through the gas filling pipeline 15, and the gas filling valve 13 is provided on the gas filling pipeline 15 to control the connection between the gas source 11 and the pressure chamber 12, and then control the amount of gas added by the gas source 11 to the pressure chamber 12, that is, the gas storage volume in the pressure chamber 12, that is, the pressure after the pressure chamber 12 is filled with gas, and then it can be ensured that the pressure chamber 12 can inject gas into the test sample 3 under the action of the pressure difference. The right end of the pressure chamber 12 can be connected to the equipment hand hole 31 of the test sample 3 through the gas injection pipeline 16, and the gas injection valve 14 is provided on the gas injection pipeline 16 to control the connection between the pressure chamber 12 and the test sample 3, and then control the amount of gas injected by the pressure chamber 12 into the test sample 3, and then control the gas volume injected into the test sample 3, so as to achieve the purpose of quantitative gas injection into the test sample 3. Among them, the gas source 11 can be a high-pressure gas cylinder or a dry air generator, which serves as the source of gas injected into the oil tank during the test; the pressure gas chamber 12 is a closed container, which is connected to the gas source 11 through a gas filling valve 13, and is filled with gas with a pressure higher than the static oil pressure of the test sample 3, so that the gas can be injected into the test sample 3.

[0028] In this embodiment, a pressure gauge 17 is connected to the pressure chamber 12 to detect the gas pressure in the pressure chamber 12. Specifically, a pressure gauge 17 is provided between the pressure chamber 12 and the gas injection valve 14 on the gas injection pipeline 16, and the gas pressure in the section of the gas injection pipeline 16 between the pressure chamber 12 and the gas injection valve 14 can be detected, and then the gas pressure in the pressure chamber 12 can be obtained, so as to control the gas filling valve 13 and the gas injection valve 14 based on the gas pressure in the pressure chamber 12. In other words, the pressure chamber 12, the pressure gauge 17, and the valve 14 are used to complete the injection of a specific volume of gas into the test product.

[0029] In this embodiment, the gas injection component 1 may also include a gas injection control unit (not shown in the figure); wherein the gas injection control unit may be respectively connected to the pressure gauge 17, the gas filling valve 13, and the gas injection valve 14, for receiving the gas pressure in the pressure gas chamber 12 obtained by the pressure gauge 17, and controlling the gas filling valve 13 and the gas injection valve 14 based on the gas pressure in the pressure gas chamber 12, so that the gas injection component 1 can perform quantitative gas injection into the test sample 3. Specifically, the gas injection control unit is connected to the pressure gauge 17, and is used to receive the gas pressure in the pressure gas chamber 12 obtained by the pressure gauge 17; the gas injection control unit is used to first control the gas filling valve 13 to open and the gas injection valve 14 to close, so that gas can be added to the pressure gas chamber 12 through the gas source 11, for example, dry air can be filled into the pressure gas chamber 12 through the gas filling valve 13; when the gas pressure in the pressure gas chamber 12 obtained by the pressure gauge 17 reaches a first preset pressure P1, the gas filling valve 13 is controlled to close; wherein the first preset pressure P1 can be determined according to actual conditions, especially greater than the static oil pressure of the insulating oil in the test piece, so that the gas can be injected into the test piece 3, that is, the pressure gas chamber 12 can be injected into the interior of the test piece 3 under the action of the pressure difference.

[0030] In this embodiment, the gas injection control unit is also used to control the gas injection valve 14 to open when injecting gas into the test object 3, so that the gas in the pressure gas chamber 12 can be injected into the test object 3 under the action of the pressure difference; the gas injection control unit can also control the gas injection valve 14 to close when the volume of gas injected into the test object is the preset gas injection volume. Specifically, when the gas injection is completed, the pressure in the pressure gas chamber 12 is greater than the static oil pressure of the insulating oil in the test object to avoid the automatic stop of the gas during the gas injection process. Specifically, the gas injection control unit is also used to control the gas injection valve 14 to open when injecting gas into the test object 3 to control the volume of gas injected into the test object 3, especially, as the gas pressure in the pressure gas chamber 12 obtained by the gas injection pressure gauge 17 gradually decreases, the gas injection control unit can control the gas filling valve 13 to close when the gas pressure in the pressure gas chamber 12 obtained by the pressure gauge 17 decreases to the second preset pressure P2, so as to control the volume of gas injected into the test object 3, so that the volume of gas injected into the test object 3 is the preset gas injection volume. Among them, the second preset pressure P2 is adapted to the preset gas injection volume. In this embodiment, the second preset pressure P2 can be determined by calculation according to the ideal gas state equation PV=nRT.

[0031] Continue to see Figure 1 The gas collection component 2 includes: a gas collection volume measurement tank 21 and a gas collection capsule 22; wherein,

[0032] The gas collection volume measurement oil tank 21 is used to store liquid medium to simulate the oil pillow of the transformer. Specifically, insulating oil can be stored in the gas collection volume measurement oil tank 21, which is consistent with the liquid medium in the test object. Among them, in order to improve the accuracy of the test detection, preferably, the liquid level of the liquid medium in the gas collection volume measurement oil tank 21 can be consistent with the oil level in the transformer oil pillow. In this embodiment, an oil drain port 211 can be provided at the bottom of the gas collection volume measurement oil tank 21 to discharge the liquid medium.

[0033] The gas collecting capsule 22 is disposed in the liquid medium of the gas collection quantity measuring oil tank 21, and is used to connect to the test sample 3, so that the gas injected into the test sample 3 by the gas injection component 1 can be collected in the gas collecting capsule, thereby making the liquid level of the liquid medium of the gas collection quantity measuring oil tank increase with the increase of gas in the gas collecting capsule, so as to determine the gas collection amount in the gas collecting capsule based on the increase of the liquid medium liquid level. Specifically, the gas collecting capsule 22 can be placed at the bottom of the gas collection quantity measuring oil tank 21, especially the gas collecting capsule 22 can be completely immersed in the liquid medium of the gas collection quantity measuring oil tank 21 during and after the gas collection process, and there is a gap between the gas collecting capsule 22 and the bottom wall of the gas collection quantity measuring oil tank 21, so as to prevent the bottom wall of the gas collection quantity measuring oil tank 21 from affecting the gas collection of the gas collecting capsule 22. The gas collecting capsule 22 is completely immersed in the liquid medium of the gas collecting volume measuring tank 21. The gas collecting capsule 22 is connected to the top gas guiding pipeline of the test sample 3 through a connecting pipeline. The control valve 5 is set on the top gas guiding pipeline or the connecting pipeline of the test sample 3. The gas collecting volume in the gas collecting capsule 22 can be determined according to the liquid level change of the liquid medium in the gas collecting volume measuring tank 21 during the gas collecting process of the gas collecting capsule 22, and then the anti-gas nesting performance of the test sample 3 can be evaluated in combination with the gas injection volume injected into the test sample 3 by the gas injection component 1; the resistance of the gas path of the test sample 3 can also be evaluated based on the gas collecting speed in the gas collecting capsule 22.

[0034] In this embodiment, a liquid level meter 23 is connected to the gas collection volume measurement oil tank 21, which is used to detect the liquid level height of the liquid medium in the gas collection volume measurement oil tank 21. The height of the liquid level in the gas collection volume measurement oil tank 21 can be measured and recorded in real time, so as to calculate the gas volume in the gas collecting capsule 22 and the time taken to reach the maximum gas collection volume, so as to evaluate the anti-gas nesting performance of the test sample 3. The change curve of the liquid level height of the liquid medium in the gas collection volume measurement oil tank 21 can also be obtained, and then based on the change curve of the liquid level height of the liquid medium in the gas collection volume measurement oil tank 21, the gas collection volume in the gas collecting capsule 22 and the time taken can be obtained, so as to evaluate the anti-gas nesting performance and gas path resistance of the test sample 3.

[0035] In this embodiment, the change in the liquid level height of the liquid medium in the gas collection volume measurement tank 21 obtained by the liquid level meter 23 can be used to determine the change in the internal gas after the gas collecting capsule 22 collects gas. That is to say, the gas collection volume of the gas collecting capsule 22 can be the product of the height difference between the increase in the liquid level height of the liquid medium in the gas collection volume measurement tank 21 before and after the gas collection by the gas collecting capsule 22 and the cross-sectional area of ​​the gas collection volume measurement tank 21.

[0036] Continue to see Figure 1The gas collection amount measuring oil tank 21 is connected with a desiccant 24, which is used to connect the air in the gas collection amount measuring oil tank 21 with the external air, that is, the gas collection amount measuring oil tank is connected with a desiccant 24, which is used to connect the air in the gas collection amount measuring oil tank 21 with the external air, thereby reducing the additional pressure generated by the gas collecting capsule 22 when collecting gas.

[0037] In this embodiment, the second preset pressure P2 can be calculated and determined according to the ideal gas state equation PV=nRT. According to the second preset pressure P2, according to the ideal gas state equation PV=nRT, it can be known that:

[0038] ;

[0039] Among them, V1 is the volume of the pressure chamber 12; P3 is the oil pressure at the position of the gas collecting capsule 22, and V2 is the ideal volume of the gas in the gas collecting capsule 22 in the gas collecting component 2 when all the gas injected by the gas injection component 1 is collected in the gas collecting component 2, that is, after all the gas injected by the pressure chamber 12 is collected in the gas collecting capsule 22, the volume of the gas collecting capsule 22 changes, which is adapted to the preset gas injection volume. There is a difference in height, but it is relatively small, and the two can be approximately equal.

[0040] In this embodiment, the oil pressure P3 at the location of the gas collecting capsule 22 can be calculated using the following formula:

[0041] ;

[0042] Among them, ρ is the density of the liquid medium in the gas collection volume measurement tank 21; h is the height between the position of the gas collection capsule 22 in the gas collection volume measurement tank 21 and the liquid level of the gas collection volume measurement tank 21; g is the gravity proportional coefficient, and the gravity magnitude is approximately 9.8N / kg.

[0043] It can be known that the second preset pressure P2 is calculated by the following formula:

[0044] ;

[0045] Wherein, V1 is the volume of the pressure chamber 12; P3 is the oil pressure at the location of the gas collecting capsule 22; V2 is the ideal volume of the gas in the gas collecting capsule 22 in the gas collecting component 2 when all the gas injected by the gas injection component 1 is collected in the gas collecting component 2, that is, the volume change of the gas collecting capsule 22 after all the gas injected by the pressure chamber 12 is collected in the gas collecting capsule 22. Wherein, the pressure chamber 12 is connected with the gas collecting capsule 22 in advance to directly inject the gas into the gas collecting capsule 22, and the change of the liquid level in the oil tank 21 is measured according to the gas collection amount, and the ideal volume V2 of the gas in the gas collecting capsule 22 in the gas collecting component 2 when all the gas injected by the gas injection component 1 is collected in the gas collecting component 2 is calculated.

[0046] The working process of the transformer gas trap detection device is as follows: first, close the gas injection valve 14 and open the gas filling valve 13, and fill gas into the pressure gas chamber 12 through the gas source 11 until the gas pressure in the pressure gas chamber 12 reaches the first preset pressure P1, and then close the gas filling valve 13; then, open the gas injection valve 14 to inject gas into the test product 3 until the gas pressure in the pressure gas chamber 12 drops to the second preset pressure P2, and close the gas injection valve 14 to control the volume of gas injected into the test product 3 to reach the ideal volume V2, that is, when the volume of gas injected into the test product 3 reaches the ideal volume V2, the pressure in the pressure gas chamber 12 drops from the first preset pressure P1 to the second preset pressure P2, and according to the change in pressure, control the opening and closing of the gas injection valve 14, thereby completing the injection process of the volume V2. Before opening the gas injection valve 14, it is also necessary to open the control valve 5, that is, before injecting gas into the test sample 3, open the control valve 5 and evacuate the gas in the gas collecting capsule 22. The control valve 5 can also be opened before opening the gas filling valve 13, or opened at other times, and there is no limitation on it in this embodiment; opening of the control valve 5 allows the dry air injected into the test sample 3 to be output from the top gas guide pipe of the test sample 3 to the gas collecting capsule 22, and the liquid level of the liquid medium in the oil tank 21 is measured by reading and recording the gas collection amount through the liquid level meter. When the gas is filled into the gas collecting capsule 22, the liquid level of the gas collection measuring tank 21 will rise. According to the liquid level height change curve and the cross-sectional area of ​​the gas collection measuring tank 21, the volume of gas entering the gas collecting capsule 22 and the time taken can be calculated. Combined with the ideal volume V2 of the gas in the gas collecting capsule 22 in the gas collecting component 2 when all the gas injected by the gas injection component 1 is collected in the gas collecting component 2, the volume of gas trapped in the test sample 3 can be calculated, and the anti-gas trap performance of the test sample 3 can be evaluated. The resistance of the gas path of the test sample 3 can also be evaluated based on the liquid level height change curve.

[0047] In summary, the transformer gas nest detection device provided in the present embodiment injects gas into the interior of the test object in a quantitative manner through a gas injection component, and collects gas through a gas collecting component, so that the gas injection component can be collected in the gas collecting component after being injected into the test object, and then the gas collection volume change curve of the gas collecting component is determined, so as to evaluate the anti-gas nest performance and gas path resistance of the test object in combination with the volume of gas injected into the test object by the gas injection component, so as to accurately evaluate the anti-gas nest performance of the equipment tank, that is, the anti-gas nest performance, that is, to inspect and evaluate whether there is gas nesting in the oil tank or the degree of gas nesting in the oil tank, to provide a design basis for the structural design of the equipment, the design of the oil tank, the riser and the air guide pipeline, to reduce the possibility of delayed alarm or missed reporting of faults caused by internal structural design defects of the oil tank when insulation defects occur inside the transformer equipment, to avoid delayed judgment of faults or defects caused by gas nesting, so as to solve the problem that the gas nesting amount of the existing oil tank and the riser is not easy to detect. The device can simulate the actual installation and operating conditions of the test product to the greatest extent, solving the problem of difficult quantitative measurement of gas dispersion. The device can also be used by transformer manufacturers and test and inspection centers.

[0048] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A transformer air trap detection device, characterized in that: include: Gas injection assembly, used to inject gas into the interior of the test object; The gas collecting component is used to connect the test sample filled with liquid medium so that the gas injected into the test sample by the gas injection component can be collected in the gas collecting component, and then the gas collection volume change curve of the gas collecting component is determined, so as to evaluate the anti-gas nesting performance and gas path resistance of the test sample based on the volume of gas injected into the test sample by the gas injection component.

2. The transformer air trap detection device according to claim 1, characterized in that: The gas injection assembly comprises: Gas source; A pressure air chamber, one end of which is connected to the gas source, and the other end is used to connect to the test sample, and a gas filling valve and a gas injection valve are respectively provided at both ends of the pressure air chamber to respectively control the amount of gas added by the gas source into the pressure air chamber and the amount of gas injected into the test sample by the pressure air chamber.

3. The transformer air trap detection device according to claim 2, characterized in that: The pressure chamber is connected with a pressure gauge for detecting the gas pressure in the pressure chamber.

4. The transformer air trap detection device according to claim 3, characterized in that: The gas injection assembly further includes: a gas injection control unit; wherein, The gas injection control unit is respectively connected to the pressure gauge, the gas filling valve, and the gas injection valve, and is used to receive the gas pressure in the pressure chamber obtained by the pressure gauge, and control the gas filling valve and the gas injection valve based on the gas pressure in the pressure chamber, so as to quantitatively inject gas into the test sample.

5. The transformer air trap detection device according to claim 3, characterized in that: The pressure chamber is connected to the hand hole of the test object through the gas injection pipeline. The pressure gauge and the gas injection valve are both arranged on the gas injection pipeline, and the pressure gauge is located between the pressure chamber and the gas injection valve.

6. The transformer air trap detection device according to claim 2, characterized in that: The gas source is a high-pressure gas cylinder or a dry air generator.

7. The transformer trap air detection device according to any one of claims 1 to 6, characterized in that: The gas collecting assembly comprises: Gas collection volume measurement tank, used to store liquid medium to simulate the oil pillow of the transformer; The gas collecting capsule is arranged in the liquid medium of the gas collection quantity measuring tank and is used to connect with the test sample so that the gas injected into the test sample by the gas injection component can be collected in the gas collecting capsule, thereby making the liquid level of the liquid medium of the gas collection quantity measuring tank increase with the increase of gas in the gas collecting capsule, so as to determine the gas collection amount in the gas collecting capsule based on the increase of the liquid medium liquid level.

8. The transformer trap air detection device according to claim 7, characterized in that: The gas collection volume measurement oil tank is connected with a liquid level meter for detecting the liquid level of the liquid medium in the gas collection volume measurement oil tank.

9. The transformer trap air detection device according to claim 7, characterized in that: The gas collection amount measuring oil tank is connected with a desiccant for connecting the air in the gas collection amount measuring oil tank with the external air.

10. The transformer trap air detection device according to any one of claims 1 to 6, characterized in that: A control valve is provided on the connecting pipeline between the air inlet of the gas collecting component and the top air guide pipeline of the test object to control the connection and disconnection between the gas collecting component and the test object.

Images