CN209783844U - Special device for transformer pressure leakage test - Google Patents
Special device for transformer pressure leakage test Download PDFInfo
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- CN209783844U CN209783844U CN201920766604.5U CN201920766604U CN209783844U CN 209783844 U CN209783844 U CN 209783844U CN 201920766604 U CN201920766604 U CN 201920766604U CN 209783844 U CN209783844 U CN 209783844U
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- conservator
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- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 239000002775 capsule Substances 0.000 claims abstract description 78
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- Housings And Mounting Of Transformers (AREA)
Abstract
The application discloses transformer is suppressed and is examined hourglass isolated plant includes: the oil discharge port of the capsule type oil conservator is used for being communicated with the oil injection port of the transformer for carrying out the pressure leakage test; the first pressure sensor is connected between the capsule type conservator and the transformer and used for detecting the pressure value of liquid in the transformer oil tank; the pressure relief device is connected to the capsule type conservator and used for outwardly relieving pressure when the air pressure in the capsule of the capsule type conservator exceeds a second preset pressure value; the air outlet pipeline of the air source device is communicated with the capsule air inlet of the capsule type conservator and is used for supplying air and pressurizing the air in the capsule of the capsule type conservator; the controller is in signal connection with both the air source device and the first pressure sensor; the controller is configured to control the air source device to start and stop according to the pressure value detected by the first pressure sensor. The application can complete the pressing leakage test of the capsule type transformer and the corrugated pipe type transformer and can also reduce the working strength of maintainers.
Description
Technical Field
The application belongs to the conventional test field of transformers, and relates to a special device for pressing and leakage testing of transformers.
Background
When the transformer normally operates, the insulating oil is filled in the oil tank of the body, and each connection part of the transformer is usually sealed by adopting a flange to compress a rubber gasket. The flange rubber gasket can ensure good sealing only by meeting a certain compression amount, but the compression amount of the rubber gasket sometimes has certain deviation due to the manufacturing process and the installation process. Before the transformer is newly installed or put into operation after overhaul, the temperature of the insulating oil in the oil tank is lower due to no load, and leakage can not occur generally if the compression amount of the rubber mat is insufficient at the moment. However, after the transformer is put into operation, the volume of the insulating oil in the oil tank is expanded due to the temperature rise due to the load, and at this time, if the compression amount of the rubber pad is insufficient, leakage is caused.
Therefore, before the transformer is installed and put into operation after overhaul, the transformer needs to be subjected to a continuous 12-hour pressurizing leakage test, namely, the actual high-temperature operation state is simulated by pressurizing transformer oil in the transformer oil tank, so that whether a leakage point exists in the transformer is tested. For the oil-filled transformer in the capsule and the corrugated pipe, the operation can be completed by pressing the oil pillow by the air pump. However, for the oil-filled transformer outside the corrugated pipe, the corrugated pipe is a stainless steel sheet, and the connection part between layers of the corrugated pipe is weak, so that the initial state cannot be recovered once the corrugated pipe is subjected to excessive pressure, and therefore the pressure leakage test cannot be completed by pressurizing the oil pillow through the air pump. In addition, the existing pressure leakage test needs manual work to monitor pressure all the time and manually adjust, and the working strength is high.
disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a device dedicated to transformer breakdown leakage testing.
The application provides a transformer is suppressed and is tried out isolated plant, includes:
The oil discharge port of the capsule type oil conservator is used for being communicated with the oil injection port of the transformer for carrying out the pressure leakage test;
The first pressure sensor is connected between the capsule type conservator and the transformer and used for detecting the pressure value of liquid in the transformer oil tank;
The pressure relief device is connected to the capsule type conservator and used for outwardly relieving pressure when the air pressure in the capsule of the capsule type conservator exceeds a second preset pressure value;
the air outlet pipeline of the air source device is communicated with the capsule air inlet of the capsule type conservator and is used for supplying air and pressurizing the air in the capsule of the capsule type conservator;
the controller is in signal connection with both the air source device and the first pressure sensor; the controller is configured to control the air source device to start and stop according to the pressure value detected by the first pressure sensor.
The application provides a transformer is suppressed and is leaked isolated device can accomplish and suppress the leakage test including the transformer of bellows external oil charge transformer in, can also reduce maintainer working strength. When the pressure of the gas in the capsule type oil conservator is increased to exceed the bearing range of the transformer due to external factors such as the increase of the air temperature and the like, the pressure relief device is opened, and when the pressure is reduced to be within the bearing range, the pressure relief device is closed, so that the safety performance is improved.
Furthermore, a first electromagnetic valve is arranged between the air outlet of the air source device and the capsule type oil conservator. The opening and closing of the first electromagnetic valve are matched with the starting and stopping of the air source device, and when the air source device works, the first electromagnetic valve is in an opening state; when the air source device stops working, the first electromagnetic valve is in a closed state, so that the pressure relief caused by untight closing of the air source device can be prevented.
Further, an oil discharge port of the capsule type oil conservator is connected with an oil injection port of the transformer through a flange; the first pressure sensor is connected to the flange. The first pressure sensor is arranged on a connecting flange between the capsule type conservator and the transformer, and can more accurately reflect the pressure born by the oil tank of the transformer body.
Further, the pressure relief device comprises a safety valve.
further, the pressure relief device comprises a second pressure sensor and a second electromagnetic valve which are in signal connection with the controller; the controller is configured to control the second electromagnetic valve to open and close according to the pressure value detected by the second pressure sensor.
Further, the air source device comprises a miniature air pump.
further, the air inlet of the miniature air pump is connected with a respirator. The respirator is used for drying the air entering the miniature air pump, and the air entering the capsule type oil conservator is ensured to be free of moisture.
furthermore, the special device for transformer pressing leakage test also comprises a base for bearing each part; the rollers are arranged below the base. The base is used for bearing all working devices and is provided with four rollers, so that the equipment is convenient to move.
the transformer pressing leakage test method using the transformer pressing leakage test special device comprises the following steps:
S1: initializing to enable the capsule type conservator to be communicated with a body oil tank of the transformer, and no gas exists between a shell of the capsule type conservator and a capsule;
S2: closing a valve between the transformer and an original oil conservator on the transformer;
S3: starting an air source device, pressurizing the capsule of the capsule type conservator, enabling the transformer oil in the capsule type conservator to enter the transformer body oil tank, and transmitting the pressure to the transformer body oil tank through the transformer oil;
When the pressure value detected by the first pressure sensor reaches a first preset pressure value, the controller controls the air source device to stop working; when the pressure value detected by the first pressure sensor is lower than a first preset pressure value, the controller controls the air source device to start, so that the oil tank of the transformer body is always born in a set pressure limit range;
when the pressure in the capsule of the capsule type conservator exceeds a second preset pressure value, the pressure relief device is opened, the gas in the capsule of the capsule type conservator is discharged, and the pressure relief device is closed until the pressure is reduced to the second preset pressure value;
S4: when the pressurizing time reaches the preset time, a valve between the original oil conservator and the transformer body of the transformer is opened, all the parts reset, and the pressurizing leakage test of the transformer is completed.
Further, step S1 specifically includes: and connecting the capsule type conservator and the transformer, so that the transformer oil in the body oil tank of the transformer flows into the capsule type conservator, and the gas in the capsule type conservator is discharged. The resetting of each component in step S4 corresponding to step S1 also includes resetting the transformer oil, and the method for resetting the transformer oil includes: and manually starting the air source device, and pumping the transformer oil in the capsule type oil conservator back to the oil tank of the transformer body.
Further, step S1 specifically includes: filling the capsule type conservator with transformer oil, and performing an oil mixing test before the pressurization to ensure that the transformer oil in the oil tank of the transformer body is not polluted in the pressurization process; connecting the capsule type conservator and the transformer.
Further, step S3 includes controlling the first solenoid valve disposed between the air outlet of the air supply unit and the capsule type conservator to open/close while controlling the air supply unit to start/stop.
The application has the advantages and positive effects that: the application provides a transformer is suppressed and is leaked isolated device can realize that the transformer is suppressed and leak test (including capsule type and bellows transformer), especially to the bellows outer oil charge formula transformer that can't suppress leak test at present, helps improving transformer safety and stability and moves, labour saving and time saving, safe and reliable.
In addition to the technical problems addressed by the present application, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the present application, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail below with reference to the accompanying drawings.
drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
Fig. 1 is a schematic structural diagram of a special device for transformer pressing leakage test provided in embodiment 1 of the present application;
fig. 2 is a schematic view of an outline of a device dedicated for transformer crush leakage testing provided in embodiment 1 of the present application.
In the figure: 1. a base; 2. a controller; 3. a micro air pump; 4. a respirator; 5. a capsule type conservator; 5-1, a shell; 5-2, and capsules; 6. a first electromagnetic valve; 7. a second electromagnetic valve; 8. a first pressure sensor; 9. a second pressure sensor; 10. an exhaust valve; 11. an oil drain valve; 12. and (4) a flange.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
example 1
referring to fig. 1 and fig. 2, the present embodiment provides a special device for transformer pressurization leakage test, which includes a base 1, a controller 2, a micro air pump 3, a silicone canister type breather 4, a capsule type conservator 5, a first electromagnetic valve 6, a second electromagnetic valve 7, a first pressure sensor 8, a second pressure sensor 9, an exhaust valve 10, an oil drain valve 11, and a flange 12;
The controller 2 mainly controls the start and stop of the micro air pump 3 and the opening and closing of the first electromagnetic valve 6 and the second electromagnetic valve 7 by receiving pressure signals from the first pressure sensor 8 and the second pressure sensor 9;
the micro air pump 3 is used for completing the pressing work and is started and stopped through the controller 2;
The silicone tank type breather 4 is used for drying the gas entering the micro air pump 3 and ensuring that the gas entering the capsule type conservator 5 does not contain moisture;
the capsule type conservator 5 comprises a shell 5-1 and a capsule 5-2, transformer oil is filled in the shell, the micro air pump 3 pumps air into the capsule 5-2, and the air pressure is transmitted to an oil tank of the transformer body through the transformer oil, so that a pressing leakage test is completed;
the opening and closing of the first electromagnetic valve 6 are matched with the starting and stopping of the micro air pump 3, and when the micro air pump 3 works, the first electromagnetic valve 6 is in an open state; when the micro air pump 3 stops working, the first electromagnetic valve 6 is in a closed state, so that pressure relief caused by untight closing of the micro air pump 3 can be prevented;
the second electromagnetic valve 7 is used for overvoltage protection, when the gas pressure in the capsule type oil conservator 5 rises to exceed the bearing range of the transformer due to external factors such as air temperature rise and the like, the second electromagnetic valve 7 can be automatically opened, and when the pressure drops to be within the bearing range, the second electromagnetic valve 7 is automatically closed;
the first pressure sensor 8 is used for controlling the opening and closing of the first electromagnetic valve 6 and the starting and stopping of the micro air pump 3, is arranged on the flange 12, and can more accurately reflect the pressure born by the transformer box body;
the second pressure sensor 9 is used for controlling the opening and closing of the second electromagnetic valve 7;
The exhaust valve 10 is used for discharging all gas inside when the transformer body oil enters the shell of the capsule type conservator 5 when the transformer body oil starts to work;
the oil drain valve 11 is used for draining the residual transformer oil in the capsule type oil conservator 5;
the flange 12 is used for connecting the device with a transformer oil injection flange;
the base 1 is used for bearing all working devices and is provided with four wheels, so that the equipment is convenient to move.
in the embodiment, the controller 2 is a KH100 controller, and both the first pressure sensor 8 and the second pressure sensor 9 are MIK-P300 pressure transmitters; in other embodiments of the present application, the controller and the first and second pressure sensors may be of other types.
The embodiment also provides a method for performing a pressure leakage test on a transformer by using the special device for pressure leakage test of the transformer, which comprises the following steps:
The first step is as follows: the special device for the transformer pressure test and the transformer oil injection flange to be subjected to the pressure test are connected by the connecting hose and the flange.
and opening the oil drain valve 11 and the oil filling flange valve, enabling the transformer oil in the oil tank of the transformer body to flow into the capsule type oil conservator 5 by means of self gravity, and exhausting gas in the capsule type oil conservator 5 through the exhaust valve 10.
The second step is that: and checking that all equipment is in a normal state, considering that the oil conservator cannot bear excessive pressure, and closing a valve between the original oil conservator and the transformer body of the transformer before pressurization.
the third step: and starting the micro air pump 3, allowing outside air to enter the capsule 5-2 of the capsule type conservator 5 through the silica gel tank type breather 4 and the micro air pump 3, increasing the volume of the capsule 5-2, and extruding the transformer oil in the capsule type conservator 5 into the transformer body oil tank, so that the air pressure is transmitted to the transformer tank through the capsule 5-2 and the transformer oil. When the pressure value detected by the first pressure sensor 8 reaches a first preset pressure value, the controller 2 controls the micro air pump 3 to stop working, and meanwhile, the electromagnetic valve 1 is closed, and the device is in a constant-pressure maintaining state. If in the constant pressure holding state, when the pressure value that causes second pressure sensor 9 to detect surpassed the second preset pressure value because ambient temperature rises, then controller 2 control second solenoid valve 7 opens and carries out the pressure release, and after the pressure value dropped to the second preset pressure value, controller 2 control second solenoid valve 7 closed. If the pressure value detected by the first pressure sensor 8 is smaller than the first preset pressure value due to the decrease of the external temperature, the controller 2 controls the micro air pump 3 to start working, and simultaneously the first electromagnetic valve 6 is opened. Therefore, the oil tank of the transformer body can be ensured to be always born within the set pressure limit range.
the fourth step: when the pressing time reaches the preset time (meeting the standard requirement), a valve between the original oil conservator and the transformer body of the transformer is opened, the micro air pump 3 is manually started, and the transformer oil in the capsule type oil conservator 5 is pumped back to the oil tank of the transformer body again. If the transformer oil in the capsule type oil conservator 5 is not pumped back to the body oil tank, the transformer body is lack of oil.
The fifth step: and closing the oil injection flange valve of the transformer, dismantling the equipment, cleaning the site and completing the transformer pressing leakage test.
Example 2
this embodiment provides a special device for transformer pressing leakage test, the main part of which is the same as that in embodiment 1, and the description of the same parts is omitted. The difference between the embodiment and the embodiment 1 is that in the embodiment, a safety valve is arranged on the capsule type conservator 5, and when the pressure in the capsule 5-2 exceeds a second preset pressure value, the safety valve automatically opens to release the pressure; when the pressure value in the capsule 5-2 is lower than a second preset pressure value, the safety valve is automatically closed. The second solenoid valve and the second pressure sensor are not provided in this embodiment.
Correspondingly, in the third step of the method for performing the transformer pressure test and leakage test by using the special device for transformer pressure test and leakage test provided by this embodiment, if in the constant-pressure maintaining state, the pressure in the capsule 5-2 exceeds the second preset pressure value due to the rise of the external temperature, the safety valve is automatically opened to perform pressure relief, and when the pressure value falls to the second preset pressure value, the safety valve is automatically closed.
In addition, the transformer pressing leakage test method provided by this embodiment is different from embodiment 1 in that, in the first step of the test method provided by this embodiment, gas in the capsule conservator 5 is not removed from the transformer oil in the transformer body, but the capsule conservator 5 is filled with the transformer oil in advance, and an oil mixing test is required before pressing, so that the transformer oil in the oil tank of the transformer body is not polluted in the pressing process.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. The utility model provides a transformer is suppressed and is tried out neglected loading isolated plant which characterized in that includes:
The oil discharge port of the capsule type oil conservator is used for being communicated with the oil injection port of the transformer for carrying out the pressure leakage test;
The first pressure sensor is connected between the capsule type conservator and the transformer and used for detecting the pressure value of liquid in the transformer oil tank;
The pressure relief device is connected to the capsule type conservator and used for outwardly relieving pressure when the air pressure in the capsule of the capsule type conservator exceeds a second preset pressure value;
The air outlet pipeline of the air source device is communicated with the capsule air inlet of the capsule type conservator and is used for supplying air and pressurizing air to the capsule of the capsule type conservator;
The controller is in signal connection with both the air source device and the first pressure sensor; the controller is configured to control the air source device to start and stop according to the pressure value detected by the first pressure sensor.
2. The special transformer pressing leakage test device according to claim 1, wherein a first electromagnetic valve is arranged between the air outlet of the air source device and the capsule-type conservator.
3. The special device for transformer pressure test leakage test of claim 1, wherein the oil outlet of the capsule type conservator is connected with the oil inlet of the transformer through a flange; the first pressure sensor is connected to the flange.
4. the transformer pressing leakage test special device according to claim 1, wherein the pressure relief device comprises a safety valve.
5. The special device for transformer pressure-reducing leakage-testing as claimed in claim 1, wherein the pressure-reducing device comprises a second pressure sensor and a second electromagnetic valve, which are in signal connection with the controller; the controller is configured to control the second electromagnetic valve to open and close according to the pressure value detected by the second pressure sensor.
6. the special transformer pressing leakage test device according to claim 1, wherein the air source device comprises a micro air pump.
7. the special device for transformer pressing leakage test as claimed in claim 6, wherein the air inlet of the micro air pump is connected with a respirator.
8. The special transformer pressing leakage test device according to claim 1, further comprising a base for bearing each component; and rollers are arranged below the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920766604.5U CN209783844U (en) | 2019-05-27 | 2019-05-27 | Special device for transformer pressure leakage test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920766604.5U CN209783844U (en) | 2019-05-27 | 2019-05-27 | Special device for transformer pressure leakage test |
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| Publication Number | Publication Date |
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| CN209783844U true CN209783844U (en) | 2019-12-13 |
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| CN201920766604.5U Active CN209783844U (en) | 2019-05-27 | 2019-05-27 | Special device for transformer pressure leakage test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111397811A (en) * | 2020-05-27 | 2020-07-10 | 杭州忒白电子科技有限公司 | Transformer oil tank sealing detection device |
-
2019
- 2019-05-27 CN CN201920766604.5U patent/CN209783844U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111397811A (en) * | 2020-05-27 | 2020-07-10 | 杭州忒白电子科技有限公司 | Transformer oil tank sealing detection device |
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