CN112816140B - Device and method for on-site detection of oil seepage performance of high-voltage bushing of transformer - Google Patents
Device and method for on-site detection of oil seepage performance of high-voltage bushing of transformer Download PDFInfo
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- CN112816140B CN112816140B CN202011644431.3A CN202011644431A CN112816140B CN 112816140 B CN112816140 B CN 112816140B CN 202011644431 A CN202011644431 A CN 202011644431A CN 112816140 B CN112816140 B CN 112816140B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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Abstract
The invention discloses a device for detecting the oil seepage performance of a high-voltage sleeve of a transformer on site, which comprises a vacuum pump, a protective gas bottle, a pressure reducing valve and a long and short air tap penetrating through a sealing plug at the top of the high-voltage sleeve, wherein the long and short air tap comprises a short port and a long port, the vacuum pump and the pressure reducing valve are connected in parallel and are communicated with the inside of the high-voltage sleeve through the short port, and the protective gas bottle is communicated with the inside of the high-voltage sleeve through the long port; the distances between the lower ends of the long port and the short port and the lower surface of the sealing plug are H and H respectively, and H > H is met. The invention has the advantage of avoiding the transformer oil from being damped and losing efficacy.
Description
Technical Field
The invention relates to the field of power transformers, in particular to a device and a method for detecting oil seepage performance of a high-voltage bushing of a transformer on site.
Background
Transformer oil is injected into a high-voltage bushing of a main transformer used in a transformer substation, so that an important insulating effect is achieved. The sleeve also retains a small top air chamber. To ensure proper insulation, the transformer oil needs to be in sufficient quantity, the gas in the top gas chamber needs to be dry gas such as nitrogen, and the pressure of the gas chamber is slightly higher than the atmospheric pressure.
In the overhauling process, the high-voltage sleeve is required to be detected in a sealing way at regular intervals to prevent insulation failure caused by leakage of transformer oil, or a sleeve oil leakage accident occurs, and an oil leakage point is required to be detected in a pressurizing way. The indoor air of the transformer factory is dried, and even a small amount of air enters the transformer bushing for overhauling, the air is also dried air, and the requirement of the gas dryness of the top air chamber is met. The environment for on-site maintenance is different from a transformer plant, the humidity of the external air is higher, the gas medium of the traditional pressurization detection method is the external air, and the humidity of the gas medium does not meet the gas dryness requirement of the top air chamber; and the water vapor is easy to condense under the action of pressure. This water can enter the transformer oil, leading to insulation failure and potential safety hazard.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a device and a method for detecting the oil seepage performance of a high-voltage bushing of a transformer, which are used for avoiding the failure of transformer oil caused by damp.
In order to solve the technical problems, the invention adopts the following technical scheme:
the device for detecting the oil seepage performance of the high-voltage bushing of the transformer comprises a vacuum pump, a protective gas bottle, a pressure reducing valve and a long and short air tap penetrating through a sealing plug at the top of the high-voltage bushing, wherein the long and short air tap comprises a short port and a long port, the vacuum pump and the pressure reducing valve are connected in parallel and are communicated with the inside of the high-voltage bushing through the short port, and the protective gas bottle is communicated with the inside of the high-voltage bushing through the long port; the distances between the lower ends of the long port and the short port and the lower surface of the sealing plug are H and H respectively, and H > H is met.
As a further improvement to the above technical solution:
the lower end of the short port is flush with the lower surface of the sealing plug.
The vacuum pump is connected with the short port through a first air path pipeline, and a first control valve is arranged on the first air path pipeline.
The protective gas bottle is connected with the long port through a second gas path pipeline, and a second control valve is arranged on the second gas path pipeline.
The short mouth and the long mouth of the long and short air tap are integrated air tap, two ends of the air tap body of the integrated air tap are respectively provided with an air tap screw thread and an air tap joint, and the middle part of the air tap body is a hexagon cylinder.
The long and short air tap is made of brass.
As a general inventive concept, the present invention also provides a method for detecting a device for detecting oil leakage performance of a high-voltage bushing of a transformer, comprising the steps of:
s1, opening a first control valve, a vacuum pump, a second control valve and a protective gas bottle, pumping out air of an air chamber at the top of a high-pressure sleeve, and closing the first control valve and the vacuum pump;
s2, adjusting the air pressure in the protective gas bottle to a preset air pressure, continuously conveying the protective gas into the high-voltage sleeve for a preset time, and when oil seepage occurs in the high-voltage sleeve within the preset time, failing the tightness of the high-voltage sleeve, otherwise, failing the tightness;
s4, closing the protective gas bottle, opening the pressure reducing valve for pressure relief, and closing the pressure reducing valve and the second control valve when the pressure is reduced to the preset air pressure;
s5, removing the long and short air nozzles to finish detection of oil seepage performance.
The shielding gas is nitrogen.
Compared with the prior art, the invention has the advantages that:
according to the device and the method, the external non-dry gas which enters the sleeve gas chamber when the sealing plug is opened is discharged through the vacuum pump; external air introduced in the traditional pressurization detection method is avoided by injecting protective gas (nitrogen), residual external non-dry air which is not completely extracted can be extruded from a short port by injecting the protective gas from a long port of a long and short air tap, so that the dryness of the inside of the air chamber is further improved, the transformer oil is prevented from being damped and losing efficacy, after the oil seepage performance is detected by injecting the protective gas, the air pressure of the air chamber at the top of the high-pressure sleeve is larger than the external environment, and the pressure is relieved in advance by adopting a pressure reducing valve, so that adverse effects caused by sudden changes of the air pressure in the subsequent step process are prevented.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the connection of the long and short air tap and the sealing plug of the invention.
The reference numerals in the drawings denote:
1. a vacuum pump; 2. a protective gas bottle; 3. a long and short air tap; 31. a short port; 32. a long opening; 4. a high voltage bushing; 41. a sealing plug; 42. a sleeve oil storage chamber; 5. a pressure reducing valve.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples. The instruments or materials used in the present invention are commercially available unless otherwise specified.
Example 1:
as shown in fig. 1 and 2, the device for detecting the oil leakage performance of the high-voltage bushing of the transformer in the present embodiment includes a vacuum pump 1, a protective gas bottle 2, a pressure reducing valve 5, and a long and short air tap 3 penetrating through a sealing plug 41 at the top of the high-voltage bushing 4, wherein the long and short air tap 3 includes a short port 31 and a long port 32, the vacuum pump 1 and the pressure reducing valve 5 are connected in parallel and are communicated with the inside of the high-voltage bushing 4 through the short port 31, and the protective gas bottle 2 is communicated with the inside of the high-voltage bushing 4 through the long port 32; the distances of the lower ends of the long port 32 and the short port 31 with respect to the lower surface of the sealing plug 41 are H and H, respectively, satisfying H > H. The device of the invention avoids the external non-drying air from entering the air chamber through the vacuum pump 1, accelerates the oiling speed and shortens the overhauling time; the dryness of the inside of the air chamber at the top of the sleeve is improved by injecting the protective gas (nitrogen) into the protective gas bottle 2, residual air which is not completely pumped out can be injected from the long opening 32 of the long and short air nozzles 3, so that the dryness of the inside of the air chamber is further improved, the transformer oil is prevented from being damped and losing efficacy, after the oil seepage performance is detected by injecting the protective gas, the air pressure of the air chamber at the top of the high-pressure sleeve is relatively large compared with the change of the external environment, and the pressure is relieved in advance by adopting a pressure reducing valve, so that adverse effects caused by sudden changes of the air pressure in the subsequent step process are prevented.
The lower end of the short port 31 is flush with the lower surface of the sealing plug 41.
The vacuum pump 1 is connected with the short port 31 through a first air path pipeline, and a first control valve K1 is arranged on the first air path pipeline. The pressure reducing valve 5 is connected in parallel with the vacuum pump 1 and then connected to the short port 31.
The protective gas bottle 2 is connected with the long port 32 through a second gas path pipeline, and a second control valve K2 is arranged on the second gas path pipeline.
The short mouth 31 and the long mouth 32 of the long and short air tap 3 are integrated air tap, two ends of the air tap body of the integrated air tap are respectively provided with air tap threads and an air tap joint, and the middle part of the air tap body is a hexagon cylinder. The air tap screw thread is matched with the sealing plug screw thread, the air pipe joint is used for being connected with the first air passage pipeline or the second air passage pipeline, and the hexagonal cylinder is convenient for using a spanner to install or detach the long and short air tap
The long and short air tap 3 is made of brass.
The detection method of the device for detecting the oil seepage performance of the high-voltage bushing of the transformer on site comprises the following steps:
(1) The first control valve K1 is started to start the vacuum pump 1, meanwhile, the second control valve K2 is opened to open the protective gas bottle 2 (nitrogen gas bottle), and the air outside the air chamber can be pumped out from the top after the sealing plug is opened.
(2) After 1 minute, the first control valve K1 was closed, and the vacuum pump 1 was turned off.
(3) The second control valve K2 and the shielding gas bottle 2 were kept open, and the pressure of the shielding gas bottle 2 was kept at 1MPa for 30 minutes.
(4) If oil seepage is found in the period, recording an oil seepage point; if no oil bleed was found during this period, a good seal was indicated.
(5) Firstly closing the protective gas bottle 2, and then releasing pressure through the pressure reducing valve 5; when the pressure drops to 0.14Mpa, the pressure reducing valve 5 is closed, and the second control valve K2 is closed.
(6) And each gas path pipeline is removed, the long and short air nozzles 3 are removed, and the sealing plug 41 is quickly plugged into the sealing port to be screwed when the long and short air nozzles 3 are removed, so that no air enters the top air chamber of the sleeve oil storage chamber 42 and the pressure is slightly positive. Thus completing the task of pressurization detection and oil seepage.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a transformer high pressure sleeve pipe oil permeability field detection is with device, includes vacuum pump (1), its characterized in that: the device for detection further comprises a protective gas bottle (2), a pressure reducing valve (5) and a long and short air tap (3) penetrating through a sealing plug (41) at the top of the high-pressure sleeve (4), wherein the long and short air tap (3) comprises a short port (31) and a long port (32), the vacuum pump (1) and the pressure reducing valve (5) are connected in parallel and are communicated with the inside of the high-pressure sleeve (4) through the short port (31), and the protective gas bottle (2) is communicated with the inside of the high-pressure sleeve (4) through the long port (32); the distances between the lower ends of the long port (32) and the short port (31) and the lower surface of the sealing plug (41) are H and H respectively, so that H is more than H; the injection of the protective gas from the long mouth (32) of the long and short air tap (3) can extrude the residual external non-dry air which is not completely extracted from the short mouth (31).
2. The apparatus according to claim 1, wherein: the lower end of the short port (31) is flush with the lower surface of the sealing plug (41).
3. The apparatus according to claim 1, wherein: the vacuum pump (1) is connected with the short port (31) through a first air path pipeline, and a first control valve is arranged on the first air path pipeline.
4. A device according to claim 3, characterized in that: the protective gas bottle (2) is connected with the long port (32) through a second gas path pipeline, and a second control valve is arranged on the second gas path pipeline.
5. The apparatus according to claim 4, wherein: the short mouth (31) and the long mouth (32) of the long and short air tap (3) are integrated air tap, two ends of the air tap body of the integrated air tap are respectively provided with an air tap screw thread and an air tap joint, and the middle part of the air tap body is a hexagon cylinder.
6. The apparatus according to claim 4, wherein: the long and short air tap (3) is made of brass.
7. A detection method of the device for in-situ detection of oil leakage performance of a high-voltage bushing of a transformer according to any one of claims 4 to 6, characterized in that: the method comprises the following steps:
s1, opening a first control valve, a vacuum pump (1), a second control valve and a protective gas bottle (2), pumping out air of an air chamber at the top of a high-pressure sleeve (4), and closing the first control valve and the vacuum pump (1);
s2, adjusting the air pressure in the protective gas bottle (2) to a preset air pressure, continuously conveying the protective gas into the high-voltage sleeve (4) for a preset time, and when oil seepage occurs in the high-voltage sleeve (4) in the preset time, ensuring that the tightness of the high-voltage sleeve (4) is unqualified, otherwise, ensuring that the tightness is qualified;
s4, closing the protective gas bottle (2), opening the pressure reducing valve (5) for pressure relief, and closing the pressure reducing valve (5) and the second control valve when the pressure is reduced to the preset air pressure;
s5, removing the long and short air nozzles (3) to finish detection of oil seepage performance.
8. The method of detecting according to claim 7, wherein: the shielding gas is nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644431.3A CN112816140B (en) | 2020-12-31 | 2020-12-31 | Device and method for on-site detection of oil seepage performance of high-voltage bushing of transformer |
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| CN202011644431.3A CN112816140B (en) | 2020-12-31 | 2020-12-31 | Device and method for on-site detection of oil seepage performance of high-voltage bushing of transformer |
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| CN112816140A CN112816140A (en) | 2021-05-18 |
| CN112816140B true CN112816140B (en) | 2023-08-15 |
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|---|---|---|---|---|
| US6296006B1 (en) * | 1998-03-10 | 2001-10-02 | Koppl Company, Inc. | System and method for sealing leaks in vessels |
| CN104198125A (en) * | 2014-09-10 | 2014-12-10 | 国家电网公司 | Sealing monitoring method for simulating sealing conditions of transformer bushing |
| CN104215409A (en) * | 2014-09-10 | 2014-12-17 | 国家电网公司 | Transformer bushing sealing condition monitoring method |
| CN204556174U (en) * | 2015-04-20 | 2015-08-12 | 江苏宝亨新电气有限公司 | A kind of device of remote monitoring bushing shell for transformer sealing |
| CN204633190U (en) * | 2015-05-27 | 2015-09-09 | 天津军粮城发电有限公司 | High-power transformer bushing oil-supplementing system |
| CN104934192A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Main transformer nitrogen protection breather and application method thereof |
| WO2015196955A1 (en) * | 2014-06-24 | 2015-12-30 | 江苏天舒电器有限公司 | Nitrogen-filling, pressure-keeping and leakage-detecting device for heat pump-refrigerating unit and control method therefor and device therefor |
| CN106124135A (en) * | 2016-08-31 | 2016-11-16 | 国家电网公司 | A kind of device and method sealing tiny leakage for detecting high-power transformer cannula tip |
| CN206002261U (en) * | 2016-08-31 | 2017-03-08 | 国家电网公司 | A kind of device for detecting high-power transformer cannula tip sealing tiny leakage |
| CN207868022U (en) * | 2018-03-05 | 2018-09-14 | 广东电网有限责任公司佛山供电局 | A kind of oil-immersed transformer not oil extraction apparatus for examination and repair |
-
2020
- 2020-12-31 CN CN202011644431.3A patent/CN112816140B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6296006B1 (en) * | 1998-03-10 | 2001-10-02 | Koppl Company, Inc. | System and method for sealing leaks in vessels |
| WO2015196955A1 (en) * | 2014-06-24 | 2015-12-30 | 江苏天舒电器有限公司 | Nitrogen-filling, pressure-keeping and leakage-detecting device for heat pump-refrigerating unit and control method therefor and device therefor |
| CN104198125A (en) * | 2014-09-10 | 2014-12-10 | 国家电网公司 | Sealing monitoring method for simulating sealing conditions of transformer bushing |
| CN104215409A (en) * | 2014-09-10 | 2014-12-17 | 国家电网公司 | Transformer bushing sealing condition monitoring method |
| CN204556174U (en) * | 2015-04-20 | 2015-08-12 | 江苏宝亨新电气有限公司 | A kind of device of remote monitoring bushing shell for transformer sealing |
| CN204633190U (en) * | 2015-05-27 | 2015-09-09 | 天津军粮城发电有限公司 | High-power transformer bushing oil-supplementing system |
| CN104934192A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Main transformer nitrogen protection breather and application method thereof |
| CN106124135A (en) * | 2016-08-31 | 2016-11-16 | 国家电网公司 | A kind of device and method sealing tiny leakage for detecting high-power transformer cannula tip |
| CN206002261U (en) * | 2016-08-31 | 2017-03-08 | 国家电网公司 | A kind of device for detecting high-power transformer cannula tip sealing tiny leakage |
| CN207868022U (en) * | 2018-03-05 | 2018-09-14 | 广东电网有限责任公司佛山供电局 | A kind of oil-immersed transformer not oil extraction apparatus for examination and repair |
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| CN112816140A (en) | 2021-05-18 |
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