CN114323503B - Method for detecting integral sealing test of oil immersed transformer - Google Patents
Method for detecting integral sealing test of oil immersed transformer Download PDFInfo
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- CN114323503B CN114323503B CN202111410857.7A CN202111410857A CN114323503B CN 114323503 B CN114323503 B CN 114323503B CN 202111410857 A CN202111410857 A CN 202111410857A CN 114323503 B CN114323503 B CN 114323503B
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Abstract
S1, isolating an oil tank body and a conservator of an oil immersed transformer, and dismantling a gas relay between the oil tank body and a conservator connecting pipeline; s2, butting a connecting flange with a flange interface on a pipeline connected with the conservator on the transformer body; s3, opening the first switch valve and the second switch valve, and injecting insulating oil through the insulating oil injection joint until the stranded insulating oil is discharged from the exhaust pipeline; s4, closing the second switch valve, continuing to inject insulating oil until the pressure detected by the pressure detecting component reaches a set value, and closing the first switch valve; s5, after standing for a set time, observing whether the pressure detected by the pressure detection component is a set value, if so, indicating that the overall sealing performance of the transformer meets the requirement; and if the total sealing performance of the oil-immersed transformer is lower than the second set value, the total sealing performance of the oil-immersed transformer is not in accordance with the requirement. The invention has the advantages of high speed, convenient operation, high safety and reliability, etc.
Description
Technical Field
The invention relates to the technical field of transformer test detection methods, in particular to an oil immersed transformer integral sealing test detection method.
Background
The oil conservator of a large oil immersed transformer (or reactor) is mainly divided into a capsule type, a diaphragm type and a bellows type. The traditional sealing test is to apply gas pressure from the conservator, and for the capsule type conservator and the diaphragm type conservator, when the capsule or the diaphragm is damaged, gas is easy to enter the insulating oil of the transformer body, and the expansion and contraction characteristics of the bellows conservator expansion joint determine that the transformer cannot apply gas from the top of the conservator to realize the sealing test. The transformer sealing test for checking the overall sealing performance is a very important checking item, and a reliable and stable overall sealing test method is required.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the method for detecting the integral sealing test of the oil immersed transformer, which has the advantages of high speed, convenient operation and high safety and reliability.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for detecting an integral sealing test of an oil immersed transformer,
the test detection device comprises a test pipeline, an exhaust pipeline and a pressure detection part, wherein one end of the test pipeline is provided with an insulating oil injection joint, the other end of the test pipeline is provided with a connecting flange, the exhaust pipeline and the pressure detection part are arranged on the test pipeline, a first switch valve is arranged on the test pipeline, and a second switch valve is arranged on the exhaust pipeline;
the test detection method comprises the following steps:
s1, isolating an oil tank body and a conservator of the oil immersed transformer, closing valves on two sides of a gas relay, and removing the gas relay between the oil tank body and a conservator connecting pipeline;
s2, butting the connecting flange with a flange interface on a pipeline connected with the conservator on the transformer body;
s3, opening the first switch valve and the second switch valve, and injecting insulating oil of the same type as the transformer body through the insulating oil injection joint until the stranded insulating oil is discharged from the exhaust pipeline;
s4, closing the second switch valve, opening a valve at the side of the transformer body, continuously injecting insulating oil until the pressure detected by the pressure detecting component reaches a first set value, and closing the first switch valve;
s5, after standing for a set time, observing whether the pressure detected by the pressure detection component is a second set value, if so, indicating that the overall sealing performance of the oil-immersed transformer meets the requirement; and if the total sealing performance of the oil-immersed transformer is lower than the second set value, the total sealing performance of the oil-immersed transformer is not in accordance with the requirement.
As a further improvement of the above technical scheme: the connecting flange is a square flange.
As a further improvement of the above technical scheme: the connecting flange is connected with the flange interface through a threaded fastener.
As a further improvement of the above technical scheme: the pressure detection component is an electronic pressure gauge or a pressure sensor.
As a further improvement of the above technical scheme: the connecting flange is provided with a detachable exhaust part above the test pipeline.
As a further improvement of the above technical scheme: the exhaust pipeline and the insulating oil injection joint are arranged at the same end of the test pipeline.
As a further improvement of the above technical scheme: in step S4, the first switch valves on one side of the pressure detection component far away from the connecting flange are closed, and the first switch valves on one side of the pressure detection component near the connecting flange are kept open.
As a further improvement of the above technical scheme: the exhaust pipeline is a transparent pipe.
As a further improvement of the above technical scheme: in step S1, the exhaust duct is arranged above the test duct.
As a further improvement of the above technical scheme: the first switch valve and the second switch valve are ball valves.
Compared with the prior art, the invention has the advantages that: the invention discloses an oil immersed transformer integral sealing test detection method, which comprises a test pipeline, wherein insulating oil injection joints and connecting flanges are respectively arranged at two ends of the test pipeline, insulating oil of the same type as a transformer body can be injected through the insulating oil injection joints, sealing connection with a flange interface of the transformer body is realized through the connecting flanges, a first switch valve, a pressure detection part and an exhaust pipeline with a second switch valve are arranged on the test pipeline, the first switch valve and the second switch valve are kept open, air in each pipeline can be exhausted after the insulating oil is injected, thereby preventing external air from entering a transformer with measured pressure, closing the second switch valve after the exhaust is completed, injecting the insulating oil into the transformer with measured pressure until the pressure reaches a set value, closing the first switch valve for pressure maintaining, and whether the pressure detected by the pressure detection part changes in the pressure maintaining process can reflect whether the sealing performance of equipment reaches standards or not. The test detection method utilizes insulating oil of the same type as the transformer body to build pressure, and compared with the method utilizing gas to build pressure, the method is faster in speed and more convenient to operate, can avoid the risk that external gas enters the transformer body, and is beneficial to improving the safety and stability of the test.
Drawings
Fig. 1 is a schematic flow chart of the detection method of the oil immersed transformer integral sealing test.
FIG. 2 is a schematic diagram showing a front view of the test device according to the present invention.
FIG. 3 is a schematic top view of the test device according to the present invention.
The reference numerals in the drawings denote: 1. testing a pipeline; 11. an insulating oil injection joint; 12. a connecting flange; 13. a first switching valve; 2. an exhaust duct; 21. a second switching valve; 3. a pressure detecting section; 4. and an exhaust member.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples of the specification.
Fig. 2 to 3 show an embodiment of a detection device used in the method for detecting the overall sealing test of the oil immersed transformer according to the present invention, where the detection device in this embodiment includes a test pipe 1, an exhaust pipe 2, and a pressure detection component 3, one end of the test pipe 1 is provided with an insulating oil injection joint 11, the other end is provided with a connection flange 12 for connecting with a flange of the transformer body, the exhaust pipe 2 and the pressure detection component 3 are disposed on the test pipe 1, the test pipe 1 is provided with a first switch valve 13, and the exhaust pipe 2 is provided with a second switch valve 21.
According to the method for detecting the integral sealing test of the oil immersed transformer, the insulating oil injection joint 11 and the connecting flange 12 are respectively arranged at two ends of the test pipeline 1, insulating oil can be injected through the insulating oil injection joint 11, sealing connection with a flange interface of a transformer body is achieved through the connecting flange 12, the first switch valve 13, the pressure detection part 3 and the exhaust pipeline 2 with the second switch valve 21 are arranged on the test pipeline 1, the first switch valve 13 and the second switch valve 21 are kept open, air in each pipeline can be discharged after the insulating oil is injected (the injected insulating oil is consistent with an oil sample of the transformer body), so that external gas is prevented from entering the transformer with the measured pressure, after the exhaust is completed, the second switch valve 21 is closed, the insulating oil is injected into the transformer with the measured pressure until the pressure reaches a set value, the first switch valve 13 is closed for pressure maintaining, whether the pressure detected by the pressure detection part 3 changes in the pressure maintaining process or not is reflected, and whether the sealing performance of the device meets standards or not can be further reflected, the structure is simple, the cost is low, and the use is convenient.
As a preferred embodiment, the connecting flange 12 is a square flange. The square flange can be better matched with a flange interface of the transformer body, and the sealing performance of the joint is improved.
Further, in this embodiment, the connection flange 12 is connected to the flange interface through a threaded fastener, so that the connection structure is reliable, the tightness is guaranteed, and the disassembly and assembly are convenient.
The pressure detecting component 3 may be an electronic pressure gauge, a pressure sensor or the like, and can accurately detect pressure and timely alarm the pressure value.
As the preferred embodiment, the detachable exhaust component 4 is arranged above the test pipeline 1 by the connecting flange 12, the exhaust component 4 can be, for example, an exhaust bolt, a plug and the like, the detachable exhaust component can be used for exhausting gas in the test detection device, the exhaust pipeline 2 is positioned at one end of the test pipeline 1, which is provided with the insulating oil injection joint 11, and the exhaust pipeline 2 is matched with the exhaust bolt or the plug, so that the air in the test detection device can be fully exhausted, and the accuracy of the test result is ensured.
As a preferred embodiment, two first switch valves 13 are provided, and the two first switch valves 13 are respectively arranged at two sides of the pressure detection component 3, so that the structural redundancy is higher, and the use is more flexible. Of course, in other embodiments, the test procedure can also be completed by providing only a single first switching valve 13.
As a preferred embodiment, the exhaust duct 2 is a transparent tube. Adopt transparent pipeline, make things convenient for in time observing in the test process whether there is insulating oil to discharge, and then judge whether gas is exhausted.
As a preferred embodiment, the exhaust pipe 2 is arranged above the test pipe 1 during testing, and the exhaust is beneficial to exhaust the gas in each pipe. After the exhaust is completed, the insulating oil in the exhaust pipeline 2 is convenient to flow back.
As a preferred embodiment, the first switch valve 13 and the second switch valve 21 are ball valves, so that the sealing performance is good, and the operation is convenient. Of course, in other embodiments, other existing valves may be used to control the on/off of each conduit.
The use method of the oil immersed transformer integral sealing test detection method comprises the following steps:
before the tightness test of the corrugated pipe conservator of the transformer is carried out, the oil immersed transformer tank body and the conservator are required to be isolated, the gas relay between the oil tank body and the conservator connecting pipeline is removed, the connecting flange 12 and the gas relay are connected by the flange interface of the side of the transformer body, and the tightness of the flange joint is ensured by locking the connecting flange through a threaded fastener. Then transformer oil is injected through the insulating oil injection joint 11, the two first switch valves 13 and the second switch valve 21 are opened, the outlet of the exhaust pipeline 2 is kept above the test pipeline 1, and as the transformer oil with pressure is continuously injected, the air in each pipeline is discharged until the stranded insulating oil is continuously discharged from the outlet of the exhaust pipeline 2, which indicates that the gas in the test device is completely discharged. The second on-off valve 21 was closed, the transformer body side valve was opened, and the pressing was continued until the pressure of the pressure detecting member 3 was about 0.035MPa, and the first on-off valve 13 on the right side of the pressure detecting member 3 was closed, and the pressing was stopped. Standing for a certain time (generally 12 hours), then observing whether the indication number of the pressure detection part 3 is reduced, if the pressure value can be kept in a set range, indicating that the overall sealing performance of the transformer is good, meeting the requirement, and completing the sealing performance test of the transformer. According to the test detection method, the pressure is built by using the insulating oil of the same type as the transformer body, compared with the pressure built by using gas, the pressure built by using the gas is faster, the operation is more convenient, the risk that external gas enters the transformer body can be avoided, and the safety and the stability of the test are improved.
While the invention has been described with reference to 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 detection method for the oil immersed transformer integral sealing test is characterized by comprising the following steps of:
the test detection device comprises a test pipeline (1), an exhaust pipeline (2) and a pressure detection component (3), wherein one end of the test pipeline (1) is provided with an insulating oil injection joint (11), the other end of the test pipeline is provided with a connecting flange (12), the exhaust pipeline (2) and the pressure detection component (3) are arranged on the test pipeline (1), a first switch valve (13) is arranged on the test pipeline (1), and a second switch valve (21) is arranged on the exhaust pipeline (2); the exhaust pipeline (2) and the insulating oil injection joint (11) are arranged at the same end of the test pipeline (1); the two first switch valves (13) are arranged, and the two first switch valves (13) are respectively arranged at two sides of the pressure detection component (3);
the test detection method comprises the following steps:
s1, isolating an oil tank body and a conservator of the oil immersed transformer, closing valves on two sides of a gas relay, and removing the gas relay between the oil tank body and a conservator connecting pipeline;
s2, abutting the connecting flange (12) against a flange interface on a pipeline connected with the conservator on the transformer body;
s3, opening the first switch valve (13) and the second switch valve (21), and injecting insulating oil of the same type as the transformer body through the insulating oil injection joint (11) until the stranded insulating oil is discharged from the exhaust pipeline (2);
s4, closing the second switch valve (21), opening a valve at the side of the transformer body, continuing to inject insulating oil until the pressure detected by the pressure detection component (3) reaches a first set value, closing the first switch valve (13) at the side, far away from the connecting flange (12), of the pressure detection component (3), and keeping the first switch valve (13) at the side, close to the connecting flange (12), of the pressure detection component (3) open;
s5, after standing for a set time, observing whether the pressure detected by the pressure detection component (3) is a second set value, if so, indicating that the whole sealing performance of the oil immersed transformer meets the requirement; and if the total sealing performance of the oil-immersed transformer is lower than the second set value, the total sealing performance of the oil-immersed transformer is not in accordance with the requirement.
2. The method for detecting the integral seal test of the oil immersed transformer according to claim 1, wherein the method comprises the following steps of: the connecting flange (12) is a square flange.
3. The method for detecting the integral sealing test of the oil immersed transformer according to claim 2, wherein the method comprises the following steps of: the connecting flange (12) is connected with the flange interface through a threaded fastener.
4. The method for detecting the integral seal test of the oil immersed transformer according to claim 1, wherein the method comprises the following steps of: the pressure detection component (3) is an electronic pressure gauge or a pressure sensor.
5. The method for detecting the integral seal test of the oil immersed transformer according to claim 1, wherein the method comprises the following steps of: the connecting flange (12) is provided with a detachable exhaust part (4) above the test pipeline (1).
6. The oil-immersed transformer overall sealing test detection method according to any one of claims 1 to 5, wherein: the exhaust pipeline (2) is a transparent pipe.
7. The oil-immersed transformer overall sealing test detection method according to any one of claims 1 to 5, wherein: in step S1, the exhaust line (2) is arranged above the test line (1).
8. The oil-immersed transformer overall sealing test detection method according to any one of claims 1 to 5, wherein: the first switch valve (13) and the second switch valve (21) are ball valves.
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| CN202111410857.7A CN114323503B (en) | 2021-11-25 | 2021-11-25 | Method for detecting integral sealing test of oil immersed transformer |
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| CN202111410857.7A CN114323503B (en) | 2021-11-25 | 2021-11-25 | Method for detecting integral sealing test of oil immersed transformer |
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| CN114323503B true CN114323503B (en) | 2023-06-23 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107907278A (en) * | 2017-10-30 | 2018-04-13 | 广西电网有限责任公司电力科学研究院 | A kind of method for conducting leak test of power transformer oil conservater capsule |
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| JP2008249617A (en) * | 2007-03-30 | 2008-10-16 | Tokyo Electric Power Co Inc:The | Abnormality diagnostic method for oil-immersed electric equipment |
| US9377341B1 (en) * | 2013-04-12 | 2016-06-28 | Joe David Watson | Electronic liquid level sensing device and gauge for liquid-immersed power transformers, reactors and similar equipment |
| US10192677B2 (en) * | 2014-08-12 | 2019-01-29 | Abb Inc. | Method and apparatus for leakage monitoring for oil-immersed electrical transformers |
| CN106500924B (en) * | 2016-10-10 | 2019-07-12 | 广西电网有限责任公司电力科学研究院 | A kind of leak hunting method of metal corrugated oil conservater |
| HUE056862T2 (en) * | 2017-03-06 | 2022-03-28 | V K Wakchaure | An apparatus for detecting fire and preventing explosion of transformer and a method thereof |
| CN208366554U (en) * | 2018-03-21 | 2019-01-11 | 广东电网有限责任公司佛山供电局 | A kind of oil-immersed transformer seal test device |
| CN109000858A (en) * | 2018-06-20 | 2018-12-14 | 国家电网公司 | The complete detection system of Multifunction transformer |
| CN110146235A (en) * | 2019-05-27 | 2019-08-20 | 国网冀北电力有限公司廊坊供电公司 | Transformer suppresses leak test dedicated unit and suppresses leak test test method |
| CN111638075A (en) * | 2020-05-19 | 2020-09-08 | 中国电力科学研究院有限公司 | Pressure simulation test device for fault gas production of oil-less equipment |
| CN113504016A (en) * | 2021-07-06 | 2021-10-15 | 重庆大唐国际彭水水电开发有限公司 | Device and method for detecting sealing performance of transformer conservator capsule |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907278A (en) * | 2017-10-30 | 2018-04-13 | 广西电网有限责任公司电力科学研究院 | A kind of method for conducting leak test of power transformer oil conservater capsule |
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