CN112816140A - Device and method for field detection of oil leakage performance of high-voltage bushing of transformer - Google Patents
Device and method for field detection of oil leakage performance of high-voltage bushing of transformer Download PDFInfo
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- CN112816140A CN112816140A CN202011644431.3A CN202011644431A CN112816140A CN 112816140 A CN112816140 A CN 112816140A CN 202011644431 A CN202011644431 A CN 202011644431A CN 112816140 A CN112816140 A CN 112816140A
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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
Abstract
The invention discloses a device for on-site detection of oil leakage performance of a high-voltage bushing of a transformer, which comprises a vacuum pump, a protective gas bottle, a pressure reducing valve and a long and short gas nozzle penetrating through a sealing plug at the top of the high-voltage bushing, wherein the long and short gas nozzle comprises a short opening and a long opening; the distances between the lower ends of the long opening and the short opening relative to the lower surface of the sealing plug are respectively H and H, and H is more than H. The invention has the advantage of avoiding the transformer oil from being affected with damp and losing efficacy.
Description
Technical Field
The invention relates to the field of power transformers, in particular to a device and a method for field detection of oil leakage performance of a high-voltage bushing of a transformer.
Background
Transformer oil is injected into a main transformer high-voltage bushing used in the transformer substation, so that the important insulation effect is achieved. The sleeve also retains a top small air chamber. In order to ensure the insulation in place, the transformer oil needs to be sufficient, 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 maintenance process, the high-voltage bushing needs to be periodically subjected to tightness detection, insulation failure caused by transformer oil leakage is prevented, or an oil leakage accident of the bushing occurs, and an oil leakage point needs to be detected by pressurization. The indoor air of the transformer factory is dry, even if a small amount of air enters the transformer bushing during overhauling, the air is also dry, and the requirement of the dryness of the gas in the top air chamber is met. The environment of on-site maintenance is different from that of a transformer plant, the humidity of external air is high, the traditional pressurization detection method adopts external air as a gas medium, and the humidity of the external air does not meet the requirement of the dryness of gas in a top gas chamber; and the water vapor is easily condensed under the action of pressure. The water can enter the transformer oil, so that insulation failure is caused, and potential safety hazard is brought.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for field detection of oil leakage performance of a transformer high-voltage bushing, which can avoid transformer oil from being affected with damp and losing efficacy.
In order to solve the technical problems, the invention adopts the following technical scheme:
the device for the field detection of the oil leakage performance of the high-voltage bushing of the transformer comprises a vacuum pump, and further comprises a protective gas bottle, a pressure reducing valve and a long and short gas nozzle penetrating through a sealing plug at the top of the high-voltage bushing, wherein the long and short gas nozzle comprises a short opening and a long opening, the vacuum pump and the pressure reducing valve are connected in parallel and communicated with the inside of the high-voltage bushing through the short opening, and the protective gas bottle is communicated with the inside of the high-voltage bushing through the long opening; the distances between the lower ends of the long opening and the short opening relative to the lower surface of the sealing plug are respectively H and H, and H is more than H.
As a further improvement to the above technical solution:
the lower end of the short opening 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 opening through a second gas path pipeline, and a second control valve is arranged on the second gas path pipeline.
The short opening and the long opening of the long and short air faucet are integrated, the two ends of the air faucet body of the integrated air faucet are respectively provided with an air faucet screw thread and an air faucet connector, and the middle of the air faucet body is a hexagonal cylinder.
The long and short air nozzles are made of brass.
As a general inventive concept, the present invention further provides a method for detecting the device for the field detection of the oil leakage performance of the high-voltage bushing of the transformer, comprising the following steps:
s1, opening the first control valve, the vacuum pump, the second control valve and the protective gas bottle, pumping out air in the air chamber at the top of the 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 bushing to a preset time, and when oil leakage occurs in the high-voltage bushing within the preset time, the sealing performance of the high-voltage bushing is unqualified, otherwise, the sealing performance is qualified;
s4, closing the protective gas bottle, opening the pressure reducing valve to relieve pressure, and closing the pressure reducing valve and the second control valve when the pressure is reduced to a preset air pressure;
and S5, disassembling the long and short air nozzles to finish the detection of the oil seepage performance.
The protective 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 entering the casing gas chamber when the sealing plug is opened is exhausted through the vacuum pump; the outside air that has avoided introducing in the traditional pressurization detection method through pouring into protective gas (nitrogen gas), and the long mouthful of injection from long and short air cock can extrude the remaining outside non-dry air of taking out completely from the short mouthful, thereby further promote the inside degree of dryness of air chamber, avoid transformer oil to wet the inefficacy, after pouring into protective gas and carry out the oil permeability performance detection, the atmospheric pressure of high-tension bushing top air chamber changes for external environment great, adopt the relief pressure valve to carry out pressure release in advance, prevent that follow-up step in-process air pressure shock from arousing harmful effects.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the connection between the long and short air faucet and the sealing plug of the present invention.
The reference numerals in the figures denote:
1. a vacuum pump; 2. a shielding gas bottle; 3. a long air tap and a short air tap; 31. short opening; 32. a long opening; 4. a high voltage bushing; 41. a sealing plug; 42. a casing oil reservoir; 5. a pressure reducing valve.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples. Unless otherwise specified, the instruments or materials employed in the present invention are commercially available.
Example 1:
as shown in fig. 1 and 2, the device for on-site detection of oil permeability of a high-voltage bushing of a transformer in the present embodiment includes a vacuum pump 1, the detection device further includes a shielding gas bottle 2, a pressure reducing valve 5, and a long and short gas nozzle 3 penetrating through a sealing plug 41 at the top of the high-voltage bushing 4, the long and short gas nozzle 3 includes a short opening 31 and a long opening 32, the vacuum pump 1 and the pressure reducing valve 5 are connected in parallel and communicated with the inside of the high-voltage bushing 4 through the short opening 31, and the shielding gas bottle 2 is communicated with the inside of the high-voltage bushing; the distances of the lower ends of the long opening 32 and the short opening 31 to the lower surface of the sealing plug 41 are H and H, respectively, and H & gt H is satisfied. The device of the invention avoids the external non-dry air from entering the air chamber through the vacuum pump 1, accelerates the oil injection speed and shortens the maintenance time; adopt protective gas bottle 2 to pour into protective gas (nitrogen gas) into and promoted the inside degree of dryness of sleeve pipe top air chamber, the long mouthful 32 injection from long and short air cock 3 can extrude the residual air of not taking out completely from short mouthful 31, thereby further promote the inside degree of dryness of air chamber, avoid transformer oil to wet the inefficacy, carry out the oil permeability performance after detecting at the injection protective gas, the atmospheric pressure of high-tension bushing top air chamber changes for external environment great, adopt the relief pressure valve to carry out pressure release in advance, prevent that follow-up step in-process air pressure shock from arousing harmful effects.
The lower end of the short mouth 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 opening 32 through a second gas path pipeline, and a second control valve K2 is arranged on the second gas path pipeline.
The short opening 31 and the long opening 32 of the long and short air faucet 3 are integrated, the two ends of the air faucet body of the integrated air faucet are respectively provided with an air faucet screw thread and an air faucet connector, and the middle part of the air faucet body is a hexagonal cylinder. The air tap screw thread is matched with the sealing plug screw thread, the air pipe connector is used for being connected with the first air path pipeline or the second air path pipeline, and the hexagonal column is convenient for installing or disassembling the long and short air taps by using a wrench
The long and short air nozzles 3 are made of brass.
The detection method of the device for the field detection of the oil leakage performance of the high-voltage bushing of the transformer comprises the following steps of:
(1) the vacuum pump 1 is started by opening the first control valve K1, and the protective gas bottle 2 (nitrogen bottle) is opened by opening the second control valve K2, so that the air outside the air chamber entering the opened sealing plug instantly can be pumped out from the top.
(2) After 1 minute, the first control valve K1 was closed, and the vacuum pump 1 was turned off.
(3) Keeping the second control valve K2 and the shielding gas bottle 2 open, the pressure of the shielding gas bottle 2 is kept at 1MPa for 30 minutes.
(4) If oil seepage is found in the period, recording an oil seepage point; if no oil bleed is observed during this period, a good seal is indicated.
(5) The protective gas bottle 2 is closed first, and then the pressure is relieved through the pressure reducing valve 5; when the pressure is reduced to 0.14Mpa, the pressure reducing valve 5 is closed, and the second control valve K2 is closed.
(6) Demolish each gas circuit pipeline, demolish long short air cock 3 again, pay attention to when demolising long short air cock 3 should plug sealing plug 41 into the sealing opening fast and screw up, guarantee that the inside air chamber of sleeve pipe oil storage chamber 42 top does not have the air admission, and is the pressure-fired. Thereby completing the task of detecting oil leakage under pressure.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (8)
1. The utility model provides a device for field detection of transformer high-voltage bushing oil permeability, includes vacuum pump (1), its characterized in that: the detection device further comprises a protective gas bottle (2), a pressure reducing valve (5) and a long and short gas nozzle (3) penetrating through a sealing plug (41) at the top of the high-pressure sleeve (4), wherein the long and short gas nozzle (3) comprises a short opening (31) and a long opening (32), the vacuum pump (1) and the pressure reducing valve (5) are connected in parallel and communicated with the inside of the high-pressure sleeve (4) through the short opening (31), and the protective gas bottle (2) is communicated with the inside of the high-pressure sleeve (4) through the long opening (32); the distances between the lower ends of the long opening (32) and the short opening (31) relative to the lower surface of the sealing plug (41) are respectively H and H, and H is more than H.
2. The apparatus of claim 1, wherein: the lower end of the short opening (31) is flush with the lower surface of the sealing plug (41).
3. The apparatus of 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. The apparatus of claim 1, wherein: the protective gas bottle (2) is connected with the long opening (32) through a second gas path pipeline, and a second control valve is arranged on the second gas path pipeline.
5. The apparatus of claim 1, wherein: the short opening (31) and the long opening (32) of the long and short air faucet (3) are integrated, air faucet screw threads and an air faucet joint are arranged at two ends of an air faucet body of the integrated air faucet respectively, and the middle of the air faucet body is a hexagonal cylinder.
6. The apparatus of claim 1, wherein: the long air tap and the short air tap (3) are made of brass.
7. The method for detecting the device for the field detection of the oil leakage performance of the high-voltage bushing of the transformer according to any one of claims 1 to 6, is characterized in that: the method comprises the following steps:
s1, opening the first control valve, the vacuum pump (1), the second control valve and the protective gas bottle (2), pumping out air in an air chamber at the top of the 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 bushing (4) to a preset time, and when oil leakage occurs in the high-voltage bushing (4) in the preset time, the sealing performance of the high-voltage bushing (4) is unqualified, otherwise, the sealing performance is qualified;
s4, closing the protective gas bottle (2), opening the pressure reducing valve (5) to relieve pressure, and closing the pressure reducing valve (5) and the second control valve when the pressure is reduced to a preset air pressure;
s5, dismantling the long and short air nozzles (3) to finish the detection of the oil seepage performance.
8. The detection method according to claim 7, characterized in that: the protective 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 true CN112816140A (en) | 2021-05-18 |
| CN112816140B CN112816140B (en) | 2023-08-15 |
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Citations (10)
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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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| CN112816140B (en) | 2023-08-15 |
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