Leakage testing device

Abstract

The leakage testing device comprises an air compression mechanism, an air inflation pipeline and a control assembly, compressed air is stored in the air compression mechanism, the air inflation pipeline is communicated with the air compression mechanism and a capsule of the transformer, and the control assembly is connected with the air inflation pipeline and comprises a first pressure gauge, a controller, a valve, a pressure release valve and a second pressure gauge. The first pressure gauge and the second pressure gauge are arranged at the air inlet end and the air outlet end of the inflation pipeline respectively, the valve and the pressure release valve are arranged between the first pressure gauge and the second pressure gauge, and the first pressure gauge, the valve and the pressure release valve are all electrically connected with the controller. The controller can automatically control the pressure release valve to be opened so as to release redundant compressed air, when the reading of the first pressure gauge is lower than the preset air pressure, the controller can control the opening degree of the valve to be automatically increased so as to enable the reading of the second pressure gauge to reach the preset air pressure, and the operation difficulty is greatly reduced through automatic control without depending on manpower.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to a leakage testing device. Background Art

[0002] Transformer oil leakage will not only make the transformer look dirty and poor, covered with oil stains, affecting the on-site working environment, but also affect the electrical performance of the transformer and bring hidden dangers. For example, oil leakage will reduce the insulation of the transformer, and live joints and control switches will operate without insulation protection, which may lead to electrical breakdown, electrical short circuit, and even transformer explosion and burning, seriously affecting the safety and stability of the power grid. Therefore, pressure leakage test is a crucial part of transformer maintenance.

[0003] The traditional pressurized leak test method mainly relies on nitrogen cylinders as the gas source. The nitrogen outlet pressure is accurately controlled by the pressure reducing valve, and the transformer is slowly inflated to test its sealing. However, it requires the operator to check the air pressure of the nitrogen cylinder in real time and control the opening and closing range of the pressure reducing valve to adjust the outlet pressure, which is very difficult to operate.

[0004] Therefore, it is necessary to improve the existing technology.

[0005] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0006] The present invention provides a leak testing device to solve the problem that the existing leak testing device requires an operator to check the gas pressure of the nitrogen cylinder in real time and control the opening and closing amplitude of the pressure reducing valve to adjust the outlet gas pressure so that the outlet gas pressure range is limited to a preset gas pressure range (0.02MPa to 0.03MPa), which causes great operating difficulty.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A leakage testing device, used for performing pressure leakage testing on a transformer, comprising:

[0009] An air compression mechanism storing compressed air;

[0010] an air filling pipe, connecting the air compression mechanism and the capsule of the transformer;

[0011] A control component is connected to the inflation pipe, and the control component includes a first pressure gauge, a controller, a valve, a pressure relief valve and a second pressure gauge. The first pressure gauge is arranged at the air inlet end of the inflation pipe, and the second pressure gauge is connected to the air outlet end of the inflation pipe. The valve and the pressure relief valve are arranged between the first pressure gauge and the second pressure gauge. The first pressure gauge, the valve and the pressure relief valve are all electrically connected to the controller. In the inflation state, the controller adjusts the valve and the pressure relief valve according to the first pressure gauge so that the indication of the second pressure gauge reaches a preset air pressure.

[0012] Preferably, the leak testing device further comprises a first filter, wherein the first filter is arranged between the air compression mechanism and the valve, and is provided with a first drying element, wherein the first drying element is used to dry the compressed air.

[0013] Preferably, the air compression mechanism includes an air storage tank and a booster pump, the booster pump is provided with an air inlet and an air outlet, air in the atmosphere is drawn in and enters the interior of the booster pump through the air inlet, the booster pump is used to compress the air to form compressed air, the air storage tank is connected to the air outlet and the first filter, and is used to store the compressed air.

[0014] Preferably, the leak testing device further comprises a third pressure gauge, wherein the third pressure gauge is connected to the air storage tank and is used for detecting the storage amount of the compressed air in real time.

[0015] Preferably, the leak testing device also includes a second filter, which is arranged between the boost pump and the air storage tank, and includes a filter screen and a second drying element, the filter screen is used to intercept dust in the compressed air, and the second drying element is used to dry the compressed air.

[0016] Preferably, the first drying member and the second drying member are one or more of a silica gel member and a calcium chloride member.

[0017] Preferably, the leak testing device further comprises a heater, which is disposed in the storage box and is used for heating the compressed air.

[0018] Preferably, the air compression mechanism and the inflation pipe are detachably connected.

[0019] Preferably, the leak test device further comprises an alarm, and the alarm is electrically connected to the controller. In the leak test state, the valve is closed, and the controller controls the alarm according to the second pressure gauge.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a leakage testing device for performing a pressurized leakage testing operation on a transformer. The device comprises an air compression mechanism, a transformer, an air charging pipe and a control component. The air compression mechanism stores compressed air. The air charging pipe connects the air compression mechanism and a capsule of the transformer. The control component is connected to the air charging pipe. The control component comprises a first pressure gauge, a controller, a valve, a pressure relief valve and a second pressure gauge. The first pressure gauge is arranged at the air inlet end of the air charging pipe, the second pressure gauge is connected to the air outlet end of the air charging pipe, the valve and the pressure relief valve are arranged between the first pressure gauge and the second pressure gauge, the first pressure gauge, the valve and the pressure relief valve are all electrically connected to the controller, and in the inflation state, the controller adjusts the valve and the pressure relief valve according to the first pressure gauge so that the indication of the second pressure gauge reaches a preset air pressure. When the indication of the first pressure gauge of the present invention is higher than the preset air pressure, the controller can automatically control the pressure relief valve to open to release excess compressed air, so that the indication of the second pressure gauge reaches the preset air pressure. When the indication of the first pressure gauge is lower than the preset air pressure, the controller can control the valve opening to automatically increase so that the indication of the second pressure gauge reaches the preset air pressure. Through automatic control and precise adjustment capabilities, it ensures that the indication of the second pressure gauge accurately reaches the preset air pressure without relying on manual labor, and the difficulty of operation is greatly reduced.

[0022] The present invention has other features and advantages, which will be apparent from or will be described in detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the leak testing device of the present invention.

[0025] Reference numerals:

[0026] 1. Booster pump; 2. Second filter; 3. Air storage tank; 4. Third pressure gauge; 5. Heater; 6. First filter; 7. Inflation pipe; 8. First pressure gauge; 9. Valve; 10. Pressure relief valve; 11. Second pressure gauge. DETAILED DESCRIPTION

[0027] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0029] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0030] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] See also Figure 1 As shown, the present invention designs a leakage testing device for performing pressure leakage testing on a transformer, which comprises:

[0032] An air compression mechanism storing compressed air;

[0033] An air filling pipe 7, connecting the air compression mechanism and the capsule of the transformer;

[0034] A control component is connected to the inflation pipe 7. The control component includes a first pressure gauge 8, a controller, a valve 9, a pressure relief valve 10 and a second pressure gauge 11. The first pressure gauge 8 is arranged at the air inlet end of the inflation pipe 7, and the second pressure gauge 11 is connected to the air outlet end of the inflation pipe 7. The valve 9 and the pressure relief valve 10 are arranged between the first pressure gauge 8 and the second pressure gauge 11. The first pressure gauge 8, the valve 9 and the pressure relief valve 10 are all electrically connected to the controller. The controller adjusts the valve 9 and the pressure relief valve 10 according to the first pressure gauge 8 so that the indication of the second pressure gauge 11 reaches a preset air pressure.

[0035] It should be noted that the preset air pressure of the present invention is 0.02MPa-0.03MPa. When the indication of the first pressure gauge 8 is higher than 0.03MPa, the controller can automatically control the pressure relief valve 10 to open to release excess compressed air, so that the indication of the second pressure gauge 11 reaches the preset air pressure. When the indication of the first pressure gauge 8 is lower than 0.02MPa, the controller can control the opening of the valve 9 to automatically increase so that the indication of the second pressure gauge 11 reaches the preset air pressure. Through automatic control and precise adjustment capabilities, it ensures that the indication of the second pressure gauge 11 accurately reaches the preset air pressure without relying on manual labor, and the difficulty of operation is greatly reduced.

[0036] Specifically, the leak test device further includes a first filter 6, which is disposed between the air compression mechanism and the valve 9, and is provided with a first drying element, which is used to dry the compressed air.

[0037] Specifically, the air compression mechanism includes an air storage tank 3 and a booster pump 1. The booster pump 1 is provided with an air inlet and an air outlet. Air in the atmosphere is drawn and enters the inside of the booster pump 1 through the air inlet. The booster pump 1 is used to compress the air to form compressed air. The air storage tank 3 is connected to the air outlet and the first filter 6 for storing compressed air.

[0038] Specifically, the leak test device also includes a second filter 2, which is arranged between the booster pump 1 and the air storage box 3, and includes a filter screen and a second drying element. The filter screen is used to intercept dust in the compressed air, and the second drying element is used to dry the compressed air.

[0039] The air in the atmosphere enters the booster pump 1 through the air inlet, and is discharged from the air outlet after being compressed. The discharged compressed air passes through the second filter 2. The filter screen of the second filter 2 can intercept dust and particulate matter in the compressed air. The second drying element can absorb moisture in the compressed air. Then the compressed air enters the air storage box 3 and the first filter 6. The first filter 6 is provided with a first drying element which can absorb moisture in the compressed air again to ensure that the gas filled in the capsule is dry.

[0040] Specifically, the first drying element and the second drying element are one or more of a silica gel element and a calcium chloride element. The silica gel element is a highly active adsorption material, which is non-toxic and tasteless, has stable chemical properties, and can effectively remove moisture from compressed air without causing pollution. The calcium chloride element can be used to quickly remove a large amount of moisture from compressed air. Of course, it should be noted that other materials can also be selected as the first drying element and the second drying element, and the present invention is not limited to this.

[0041] Specifically, the leak testing device further comprises a third pressure gauge 4, which is connected to the air storage tank 3 and is used for detecting the storage amount of compressed air in real time.

[0042] The third pressure gauge 4 and the booster pump 1 of the present invention are both electrically connected to the controller. When the reading of the third pressure gauge 4 is lower than a preset first threshold value, the controller will start the booster pump 1 to draw air from the atmosphere and compress it to replenish the compressed air in the air storage tank 3. When the reading of the third pressure gauge 4 rises to a preset second threshold value, the controller will turn off the booster pump 1 to ensure that the amount of gas in the air storage tank 3 is sufficient.

[0043] Specifically, the leak testing device further comprises a heater 5, which is arranged in the storage box and is used for heating the compressed air, drying the compressed air and removing moisture from the compressed air.

[0044] Specifically, the air compression mechanism and the inflation pipe 7 are detachably connected. When a component fails or needs to be cleaned, it can be quickly removed and processed, which is very convenient.

[0045] Specifically, the leak test device also includes an alarm, which is electrically connected to the controller. In the leak test state, the valve 9 is closed, and the controller controls the alarm according to the second pressure gauge 11.

[0046] After the inflation is completed, the valve 9 is closed to enter the leak test state, and the capsule begins a 24-hour pressure test. During the pressure test, if the reading of the second pressure gauge 11 decreases, the capsule is leaking. At this time, the controller controls the alarm to start to warn the staff that the capsule has a leakage problem.

[0047] So far, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A leakage test device for performing pressure leakage test on a transformer, characterized in that: include: An air compression mechanism storing compressed air; An air filling pipe (7) connecting the air compression mechanism and the capsule of the transformer; A control component is connected to the inflation pipe (7), the control component comprising a first pressure gauge (8), a controller, a valve (9), a pressure relief valve (10) and a second pressure gauge (11), the first pressure gauge (8) being arranged at the air inlet end of the inflation pipe (7), the second pressure gauge (11) being connected to the air outlet end of the inflation pipe (7), the valve (9) and the pressure relief valve (10) being arranged between the first pressure gauge (8) and the second pressure gauge (11), the first pressure gauge (8), the valve (9) and the pressure relief valve (10) being all electrically connected to the controller, and in the inflation state, the controller adjusts the valve (9) and the pressure relief valve (10) according to the first pressure gauge (8) so that the reading of the second pressure gauge (11) reaches a preset air pressure.

2. The leak test device according to claim 1, characterized in that: It also comprises a first filter (6), the first filter (6) being arranged between the air compression mechanism and the valve (9), and being provided with a first drying element, the first drying element being used to dry the compressed air.

3. The leak test device according to claim 2, characterized in that: The air compression mechanism comprises an air storage box (3) and a booster pump (1); the booster pump (1) is provided with an air inlet and an air outlet; air in the atmosphere is drawn in and enters the inside of the booster pump (1) through the air inlet; the booster pump (1) is used to compress the air to form compressed air; the air storage box (3) is connected to the air outlet and the first filter (6) and is used to store the compressed air.

4. The leak test device according to claim 3, characterized in that: It also includes a third pressure gauge (4), which is connected to the air storage box (3) and is used to detect the storage amount of the compressed air in real time.

5. The leak test device according to claim 3, characterized in that: It also includes a second filter (2), which is arranged between the booster pump (1) and the air storage box (3), and includes a filter screen and a second drying element, the filter screen is used to intercept dust in the compressed air, and the second drying element is used to dry the compressed air.

6. The leak test device according to claim 5, characterized in that: The first drying member and the second drying member are one or more of a silica gel member and a calcium chloride member.

7. The leak testing device according to claim 3, characterized in that: It also comprises a heater (5), which is arranged in the storage box and is used to heat the compressed air.

8. The leak testing device according to claim 1, characterized in that: The air compression mechanism and the inflation pipe (7) are detachably connected.

9. The leak test device according to claim 8, characterized in that: It also includes an alarm, which is electrically connected to the controller. When in a leak test state, the valve (9) is closed, and the controller controls the alarm according to the second pressure gauge (11).

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