CN114323503A - Integral sealing test detection method for oil-immersed transformer - Google Patents
Integral sealing test detection method for oil-immersed transformer Download PDFInfo
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- CN114323503A CN114323503A CN202111410857.7A CN202111410857A CN114323503A CN 114323503 A CN114323503 A CN 114323503A CN 202111410857 A CN202111410857 A CN 202111410857A CN 114323503 A CN114323503 A CN 114323503A
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Abstract
A method for detecting an integral sealing test of an oil immersed transformer comprises the steps of S1, isolating an oil tank body and an oil conservator of the oil immersed transformer, and removing a gas relay between the oil tank body and a connecting pipeline of the oil conservator; s2, butting the connecting flange with a flange interface on a pipeline connected with the oil conservator on the transformer body; s3, opening the first switch valve and the second switch valve, and injecting and 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 detection 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 integral sealing performance of the transformer meets the requirement; if the sealing performance of the oil-immersed transformer is lower than the second set value, the integral sealing performance of the oil-immersed transformer is not qualified. The invention has the advantages of high speed, convenient operation, high safety and reliability, and the like.
Description
Technical Field
The invention relates to the technical field of transformer test detection methods, in particular to an integral sealing test detection method for an oil-immersed transformer.
Background
Conservators of large oil-immersed transformers (or reactors) are mainly divided into capsule type, diaphragm type and bellows type. Traditional sealing test all is from conservator application gas pressure, and to capsule type, diaphragm type conservator, when capsule or diaphragm damage, lead to gas to get into in transformer body insulating oil easily, the flexible characteristic of bellows conservator telescopic joint has decided the transformer can not be from the conservator top application gas and has realized sealing test. The testing of the overall tightness of the transformer sealing test is a very important testing item, and a reliable and stable overall sealing test method is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the method for detecting the integral sealing test of the oil-immersed transformer, which has the advantages of high speed, convenience in operation, high safety and high reliability.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for detecting the 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, the test pipeline is provided with a first switch valve, and the exhaust pipeline is provided with a second switch valve;
the test detection method comprises the following steps:
s1, isolating the oil tank body and the oil conservator of the oil immersed transformer, closing valves on two sides of the gas relay, and removing the gas relay between the oil tank body and a connecting pipeline of the oil conservator;
s2, butting the connecting flange with a flange interface on a pipeline connected with the oil conservator on the transformer body;
s3, opening the first switch valve and the second switch valve, and injecting the 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 side valve of the transformer body, continuing to inject insulating oil until the pressure detected by the pressure detection 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 integral sealing performance of the oil-immersed transformer meets the requirement; if the sealing performance of the oil-immersed transformer is lower than the second set value, the integral sealing performance of the oil-immersed transformer is not qualified.
As a further improvement of the above technical solution: the connecting flange is a square flange.
As a further improvement of the above technical solution: the connecting flange is connected with the flange interface through a threaded fastener.
As a further improvement of the above technical solution: the pressure detection component is an electronic pressure gauge or a pressure sensor.
As a further improvement of the above technical solution: the connecting flange is provided with a detachable exhaust part above the test pipeline.
As a further improvement of the above technical solution: 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 solution: the number of the first switch valves is two, the two first switch valves are respectively arranged on two sides of the pressure detection component, in step S4, the first switch valve on one side, away from the connecting flange, of the pressure detection component is closed, and the first switch valve on one side, close to the connecting flange, of the pressure detection component is kept open.
As a further improvement of the above technical solution: the exhaust pipeline is a transparent pipe.
As a further improvement of the above technical solution: in step S1, the exhaust duct is disposed above the test duct.
As a further improvement of the above technical solution: 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 a method for detecting the integral sealing test of an oil immersed transformer, which comprises a test pipeline, wherein two ends of the test pipeline are respectively provided with an insulating oil injection joint and a connecting flange, insulating oil with the same type as the transformer body can be injected through the insulating oil injection joint, the sealing connection with the flange interface of the transformer body is realized through the connecting flange, the test pipeline is provided with a first switch valve, a pressure detection component and an exhaust pipeline with a second switch valve, the first switch valve and the second switch valve are kept opened, air in each pipeline can be exhausted after the insulating oil is injected, so that external air is prevented from entering the transformer with the pressure to be detected, after the exhaust is finished, the second switch valve is closed, the insulating oil is injected into the transformer with the pressure to be detected until the pressure reaches a set value, the first switch valve is closed to maintain the pressure, and whether the pressure detected by the pressure detection component changes or not in the pressure maintaining process, and then can reflect whether the sealing performance of the equipment reaches the standard, simple structure, low cost and convenient use. According to the test detection method, the pressure is established by using the insulating oil with the same type as the transformer body, compared with the method for establishing the pressure by using gas, the speed is higher, the operation is more convenient, the risk that external gas enters the transformer body can be avoided, and the test safety and stability are improved.
Drawings
Fig. 1 is a schematic flow chart of the method for detecting the overall sealing test of the oil-immersed transformer.
FIG. 2 is a schematic front view of the test detection device of the present invention.
FIG. 3 is a schematic top view of the test detection device of the present invention.
The reference numerals in the figures denote: 1. testing the pipeline; 11. insulating oil injection joints; 12. a connecting flange; 13. a first on-off valve; 2. an exhaust duct; 21. a second on-off valve; 3. a pressure detecting member; 4. an exhaust component.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
Fig. 2 to 3 show an embodiment of a detection device adopted in the method for detecting the overall sealing test of the oil-immersed transformer according to the present invention, the detection device of the embodiment includes a test pipeline 1, an exhaust pipeline 2 and a pressure detection component 3, one end of the test pipeline 1 is provided with an insulating oil injection joint 11, the other end of the test pipeline 1 is provided with a connection flange 12 for connecting with a flange interface of a transformer body, the exhaust pipeline 2 and the pressure detection component 3 are arranged on the test pipeline 1, the test pipeline 1 is provided with a first switch valve 13, and the exhaust pipeline 2 is provided with a second switch valve 21.
The method for detecting the integral sealing test of the oil-immersed transformer comprises the steps of respectively arranging an insulating oil injection joint 11 and a connecting flange 12 at two ends of a test pipeline 1, injecting insulating oil through the insulating oil injection joint 11, realizing the sealing connection with a flange interface of the transformer body through the connecting flange 12, arranging a first switch valve 13, a pressure detection part 3 and an exhaust pipeline 2 with a second switch valve 21 on the test pipeline 1, keeping the first switch valve 13 and the second switch valve 21 open, discharging air in each pipeline after injecting the insulating oil (the injected insulating oil is consistent with an oil sample of the transformer body), preventing external air from entering the transformer with the measured pressure, closing the second switch valve 21 after completing the exhaust, injecting the insulating oil into the transformer with the measured pressure until the pressure reaches a set value, closing the first switch valve 13 for pressure maintaining, whether the pressure that detects through pressure detection part 3 changes among the pressurize process, and then can reflect whether up to standard, simple structure, with low costs, convenient to use of the sealing performance of equipment.
In a preferred embodiment, the attachment flange 12 is a square flange. The square flange can be better matched with the flange interface of the transformer body, and the sealing performance of the joint is favorably 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 sealing performance is guaranteed, and the mounting and dismounting are convenient.
The pressure detection part 3 can be an electronic pressure gauge or a pressure sensor and the like, and can accurately detect pressure and alarm the pressure value in time.
As a preferred embodiment, the detachable exhaust component 4 is arranged above the test pipeline 1 of the connecting flange 12, the exhaust component 4 may be, for example, an exhaust bolt, a plug, etc., and can be used for exhausting gas in the test detection device after being detached, the exhaust pipeline 2 is located at one end of the test pipeline 1 where the insulating oil injection joint 11 is arranged, and the exhaust pipeline 2 is matched with the exhaust bolt or the plug, so that air in the test detection device can be exhausted sufficiently, and the accuracy of the test result can be ensured.
In 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 part 3, so that the structural redundancy is higher, and the use is more flexible. Of course, in other embodiments, the test process can be completed by providing only a single first on-off valve 13.
As a preferred embodiment, the exhaust duct 2 is a transparent tube. Adopt transparent pipeline, whether in time observe insulating oil and discharge in the convenient test process, and then judge whether gaseous row is exhausted.
In a preferred embodiment, the exhaust duct 2 is disposed above the test duct 1 during the test, and the exhaust is advantageous for exhausting the gas in each duct. After the exhaust is finished, the insulating oil in the exhaust pipeline 2 can conveniently flow back.
As a preferred embodiment, the first switch valve 13 and the second switch valve 21 are both 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 opening and closing of the conduits.
The use method of the integral sealing test detection method of the oil-immersed transformer comprises the following steps:
before carrying out the test of transformer bellows conservator leakproofness, need keep apart oil-immersed transformer oil tank body and conservator, demolish the gas relay between oil tank body and the conservator connecting tube, lean on transformer body side flange interface to connect flange 12 and gas relay to through threaded fastener locking, guarantee the leakproofness of flange joint department. Then, the transformer oil is injected through the insulating oil injection joint 11, the two first and second switching valves 13 and 21 are opened, the outlet of the exhaust pipe 2 is kept above the test pipe 1, and as the transformer oil with pressure is continuously injected, the air in each pipe is discharged until the insulating oil in a strand is continuously discharged from the outlet of the exhaust pipe 2, indicating that the gas inside the test apparatus has been completely discharged. The second on-off valve 21 is closed, the side valve of the transformer body is opened, and the pressurizing is continued until the pressure of the pressure detection part 3 shows about 0.035MPa, and the first on-off valve 13 on the right side of the pressure detection part 3 is closed, and the pressurizing is 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 whole 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 insulating oil with the same type as the transformer body is used for building pressure, compared with the method for building pressure by using gas, the speed is higher, the operation is more convenient, the risk that external gas enters the transformer body can be avoided, and the test safety and stability are improved.
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 (10)
1. The method for detecting the integral sealing test of the oil-immersed transformer is characterized by comprising the following steps:
the test detection device comprises a test pipeline (1), an exhaust pipeline (2) and a pressure detection part (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 part (3) are arranged on the test pipeline (1), the test pipeline (1) is provided with a first switch valve (13), and the exhaust pipeline (2) is provided with a second switch valve (21);
the test detection method comprises the following steps:
s1, isolating the oil tank body and the oil conservator of the oil immersed transformer, closing valves on two sides of the gas relay, and removing the gas relay between the oil tank body and a connecting pipeline of the oil conservator;
s2, butting the connecting flange (12) with 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 the same type of insulating oil 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 side valve of the transformer body, continuing to inject insulating oil until the pressure detected by the pressure detection component (3) reaches a first set value, and closing the first switch valve (13);
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 integral sealing performance of the oil-immersed transformer meets the requirement; if the sealing performance of the oil-immersed transformer is lower than the second set value, the integral sealing performance of the oil-immersed transformer is not qualified.
2. The method for detecting the integral sealing test of the oil-immersed transformer according to claim 1, wherein the method comprises the following steps: 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: the connecting flange (12) is connected with the flange interface through a threaded fastener.
4. The method for detecting the integral sealing test of the oil-immersed transformer according to claim 1, wherein the method comprises the following steps: the pressure detection part (3) is an electronic pressure gauge or a pressure sensor.
5. The method for detecting the integral sealing test of the oil-immersed transformer according to claim 1, wherein the method comprises the following steps: the connecting flange (12) is provided with a detachable exhaust part (4) above the test pipeline (1).
6. The method for detecting the integral sealing test of the oil-filled transformer according to any one of claims 1 to 5, wherein: the exhaust pipeline (2) and the insulating oil injection joint (11) are arranged at the same end of the test pipeline (1).
7. The method for detecting the integral sealing test of the oil-immersed transformer according to claim 6, wherein the method comprises the following steps: the number of the first switch valves (13) is two, the two first switch valves (13) are respectively arranged on two sides of the pressure detection component (3), in the step S4, the first switch valve (13) on one side, away from the connecting flange (12), of the pressure detection component (3) is closed, and the first switch valve (13) on one side, close to the connecting flange (12), of the pressure detection component (3) is kept open.
8. The method for detecting the integral sealing test of the oil-filled transformer according to any one of claims 1 to 5, wherein: the exhaust pipeline (2) is a transparent pipe.
9. The method for detecting the integral sealing test of the oil-filled transformer according to any one of claims 1 to 5, wherein: in step S1, the exhaust duct (2) is arranged above the test duct (1).
10. The method for detecting the integral sealing test of the oil-filled transformer according to any one of claims 1 to 5, wherein: the first switch valve (13) and the second switch valve (21) are both ball valves.
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| Application Number | Priority Date | Filing Date | Title |
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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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