CN114242450A - Static discharge process and effect verification method for large oil-immersed transformer in high-altitude area - Google Patents
Static discharge process and effect verification method for large oil-immersed transformer in high-altitude area Download PDFInfo
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- CN114242450A CN114242450A CN202111317455.2A CN202111317455A CN114242450A CN 114242450 A CN114242450 A CN 114242450A CN 202111317455 A CN202111317455 A CN 202111317455A CN 114242450 A CN114242450 A CN 114242450A
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- transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
Abstract
The invention relates to a static discharge process and an effect verification method for a large oil-immersed transformer in a high-altitude area, and belongs to the technical field of transformer manufacturing. The technical scheme is as follows: inquiring the local altitude and the atmospheric pressure value, comparing the local altitude and the atmospheric pressure value with the standard atmospheric pressure value, and calculating an actual pressure value a; inquiring the maximum value b of the positive pressure which can be borne by the project transformer main body; and applying positive pressure to the inside of the transformer to a value a through an exhaust pipeline of the oil conservator, so that the inside of the transformer reaches a standard atmospheric pressure value, and the pressure is continuously increased but cannot exceed the maximum value b of the positive pressure which can be borne by the transformer main body. The invention has the beneficial effects that: the oil immersion speed and quality of the insulating material of the transformer are improved, the gas in the transformer is accelerated to be discharged, the influence of regions is avoided, the purpose of processing the static discharge process can be better achieved, the effect verification is carried out on the static discharge process, and the product quality is ensured.
Description
Technical Field
The invention relates to a static discharge process and an effect verification method for a large oil-immersed transformer in a high-altitude area, and belongs to the technical field of transformer manufacturing.
Background
With the rapid development of the power industry in China, a transformer is taken as one of indispensable important devices in a power system, and is produced, manufactured and put into use in high-altitude areas successively.
The large oil-immersed transformer needs to be subjected to strict static discharge process treatment in the manufacturing process, and the purpose is as follows: 1) in order to discharge gas in insulating oil and solid insulation; 2) the insulating oil is soaked through the solid insulating part, so that the insulating part and the oil form an oil paper insulating system to enhance the insulating strength. The existing transformer static discharge process adopts natural static discharge after the transformer vacuum oil injection and hot oil circulation process is finished, and the length of the static discharge time is determined according to the voltage level of the transformer. However, the process effect is not ideal in high altitude areas, and the atmospheric pressure in the high altitude areas is lower than a standard value, so that the oil immersion and gas discharge of the solid insulating part are not facilitated, and the product quality and the product period cannot be ensured.
Disclosure of Invention
The invention aims to provide a static discharge process and an effect verification method for a large oil-immersed transformer in a high-altitude area, which can improve the oil immersion speed and quality of an insulating material of the transformer, accelerate the discharge of gas in the transformer, avoid the influence of the area, better achieve the purpose of processing the static discharge process, verify the effect of the static discharge process, ensure the product quality and solve the technical problems in the prior art.
The technical scheme of the invention is as follows:
a static discharge process of a large oil-immersed transformer in a high-altitude area comprises the following steps:
inquiring local altitude and atmospheric pressure value, comparing with standard atmospheric pressure value and calculating actual pressure value a;
secondly, the transformer completes assembly of all parts, vacuum oil injection and hot oil circulation according to a normal process flow, and a positive pressure gauge is arranged at the position of a valve at the top or the bottom of the transformer main body;
inquiring the maximum value b of the positive pressure bearing capacity of the project transformer main body according to the drawing and the related technical protocol;
connecting a temporary pipeline by using dry air or nitrogen, applying positive pressure to the interior of the transformer to a value a through an exhaust pipeline of the oil conservator, enabling the interior of the transformer to reach a standard atmospheric pressure value, and continuously increasing the pressure but not exceeding the maximum value b of the positive pressure which can be borne by the transformer main body;
determining the static discharge time according to the voltage grade of the transformer;
sixthly, observing the pressure gauge every 4h during the standing period, making a table to record time and pressure values, and supplementing in time if pressure drop exists;
seventhly, exhausting the transformer once every 24 hours during static discharge, wherein the exhaust standard is completed through the air discharge plugs at all positions, the air discharge plugs are screwed down after oil is discharged from the air discharge plugs, and tables are made to record exhaust time and exhaust conditions at all positions;
standing for a set time, discharging no gas from the gas discharge plugs at all positions of the transformer, and finishing standing.
After the standing and releasing are finished, the pressure in the transformer is slowly relieved through an exhaust pipe of the oil conservator, and tools such as pipelines, pressure gauges and the like are removed; the transformer has test conditions.
A static discharge effect verification method for a large oil-immersed transformer in a high-altitude area comprises the following steps:
firstly, preparing; preparing two identical insulating sample pieces, namely a sample piece 1 and a sample piece 2, and drying and dehydrating the sample piece 1 and the sample piece 2 together;
(II) experimental process:
(1) respectively placing the sample piece 1 and the sample piece 2 into a No. 1 experimental device and a No. 2 experimental device, vacuumizing the two experimental devices and performing vacuum oil injection; the temperature of the oil is 50 ℃, the temperature of the oil after the oil is injected is 30 ℃, and the oil is naturally cooled to the room temperature;
(2) after the No. 1 test device is injected with oil, the interior is kept in a negative pressure state, the value of the pressure lower than atmospheric pressure is-0.03 MPa, and the experimental temperature is 21 ℃ of the ambient temperature;
(3) after the No. 2 test device is injected with oil, the interior is maintained to be in a normal pressure state, the standard atmospheric pressure value is achieved, and the test temperature is 21 ℃ of the environment temperature;
thirdly, analyzing and concluding data: according to test data, the oil immersion speed of the insulating sample piece in a negative pressure state is compared with that in a normal pressure state, and the oil immersion size difference is 3-5 mm every 24 hours; under the conditions that the temperature of the insulating sample piece is 21 ℃ and the negative pressure is-0.03 MPa, the complete oil immersion needs 4-5 days, and only 3 days under the normal pressure condition; therefore, under the condition that the environment, the temperature and the treatment process are the same, the oil immersion speed of the insulating sample piece is higher under the normal pressure state than under the negative pressure state, and the time for completely immersing the insulating sample piece in the oil is shorter under the normal pressure state than under the negative pressure state.
The testing device is a closed container, the air pressure in the closed container is adjusted through a vacuum machine, and the testing device is provided with a pressure gauge for simulating the running environment of the transformer.
The invention has the beneficial effects that: the oil immersion speed and quality of the insulating material of the transformer are improved, the gas in the transformer is accelerated to be discharged, the influence of regions is avoided, the purpose of processing the static discharge process can be better achieved, the effect verification is carried out on the static discharge process, and the product quality is ensured.
Drawings
FIG. 1 is a schematic view of a transformer belt-pressing static discharge process according to an embodiment of the invention;
FIG. 2 is a schematic illustration of an experimental setup used in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an oil immersion process according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an experiment according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A static discharge process of a large oil-immersed transformer in a high-altitude area comprises the following steps:
firstly, inquiring local altitude and atmospheric pressure value, comparing with standard atmospheric pressure value (0.101 MPa) and calculating actual pressure value a (for example, the altitude of a certain place is 3000m, the atmospheric pressure is 0.077MPa, namely the value a is equal to-0.024 MPa);
secondly, the transformer completes assembly of all parts, vacuum oil injection and hot oil circulation according to a normal process flow, and a positive pressure gauge is arranged at the position of a valve at the top or the bottom of the transformer main body and is arranged at a position which is convenient to observe as far as possible;
inquiring the maximum value b of the positive pressure bearing capacity of the project transformer main body according to the drawing and the related technical protocol;
connecting a temporary pipeline by using dry air or nitrogen, applying positive pressure to the interior of the transformer to a value a through an exhaust pipeline of the oil conservator, enabling the interior of the transformer to reach a standard atmospheric pressure value, and continuously increasing the pressure but not exceeding the maximum value b of the positive pressure which can be borne by the transformer main body;
determining the static discharge time according to the voltage grade of the transformer;
sixthly, observing the pressure gauge every 4h during the standing period, making a table to record time and pressure values, and supplementing in time if pressure drop exists;
seventhly, exhausting the transformer once every 24 hours during static discharge, wherein the exhaust standard is completed through the air discharge plugs at all positions, the air discharge plugs are screwed down after oil is discharged from the air discharge plugs, and tables are made to record exhaust time and exhaust conditions at all positions;
standing for a set time, discharging no gas from the gas discharge plugs at all positions of the transformer, and finishing standing.
After the standing and releasing are finished, the pressure in the transformer is slowly relieved through an exhaust pipe of the oil conservator, and tools such as pipelines, pressure gauges and the like are removed; the transformer has test conditions.
A static discharge effect verification method for a large oil-immersed transformer in a high-altitude area comprises the following steps:
firstly, preparing; preparing two identical insulating sample pieces, namely a sample piece 1 and a sample piece 2, and drying and dehydrating the sample piece 1 and the sample piece 2 together;
(II) experimental process:
(1) respectively placing the sample piece 1 and the sample piece 2 into a No. 1 experimental device and a No. 2 experimental device, vacuumizing the two experimental devices and performing vacuum oil injection; the temperature of the oil is 50 ℃, the temperature of the oil after the oil is injected is 30 ℃, and the oil is naturally cooled to the room temperature;
(2) after the No. 1 test device is injected with oil, the interior is kept in a negative pressure state, the value of the pressure lower than atmospheric pressure is-0.03 MPa, and the experimental temperature is 21 ℃ of the ambient temperature;
(3) after the No. 2 test device is injected with oil, the interior is maintained to be in a normal pressure state, the standard atmospheric pressure value is achieved, and the test temperature is 21 ℃ of the environment temperature;
thirdly, analyzing and concluding data: according to test data, the oil immersion speed of the insulating sample piece in a negative pressure state is compared with that in a normal pressure state, and the oil immersion size difference is 3-5 mm every 24 hours; under the conditions that the temperature of the insulating sample piece is 21 ℃ and the negative pressure is-0.03 MPa, the complete oil immersion needs 4-5 days, and only 3 days under the normal pressure condition; therefore, under the condition that the environment, the temperature and the treatment process are the same, the oil immersion speed of the insulating sample piece is higher under the normal pressure state than under the negative pressure state, and the time for completely immersing the insulating sample piece in the oil is shorter under the normal pressure state than under the negative pressure state.
The testing device is a closed container, the air pressure in the closed container is adjusted through a vacuum machine, and the testing device is provided with a pressure gauge for simulating the running environment of the transformer.
In the embodiment, in order to further prove the method, an oil immersion speed simulation experiment of solid insulation is carried out under the conditions of negative pressure (lower than a standard atmospheric pressure value) and normal pressure (a standard atmospheric pressure value), and the comparison and analysis of data prove that the method can improve the static discharge effect of the transformer in the high-altitude area. The experiment is as follows:
1 preparation work
Two identical insulating samples, sample 1 and sample 2, were prepared, each having a gauge of 50mm x 200 mm. The sample 1 and the sample 2 were dried and dehydrated together.
2 course of experiment
(1) The sample piece 1 and the sample piece 2 are respectively placed into a No. 1 experimental device and a No. 2 experimental device, and the two experimental devices are vacuumized and filled with oil in vacuum. The oil temperature is 50 ℃, the temperature after oil injection is 30 ℃, and the temperature is naturally cooled to the room temperature. The experimental equipment is shown in figure 2, and the oil immersion process of the cushion block is shown in figure 3.
(2) After the No. 1 test device is filled with oil, the interior is kept in a negative pressure state (the value of the pressure lower than atmospheric pressure is-0.03 MPa), and the test temperature is about 21 ℃ of the ambient temperature.
(3) After the 2# test device is filled with oil, the interior of the test device is kept in a normal pressure state (standard atmospheric pressure value), and the test temperature is about 21 ℃ of the ambient temperature.
The oil immersion test data of the two insulation samples are shown in table 1.
Table 1 oil immersion size units: mm is
3 data analysis and conclusions
According to test data, the oil immersion speed of the insulating sample piece in a negative pressure state is compared with that in a normal pressure state, and the oil immersion size difference is about 3-5 mm every 24 hours. The insulating sample piece needs 4-5 days for complete oil immersion at the temperature of about 21 ℃ and under the negative pressure of-0.03 MPa, and only needs 3 days under the normal pressure.
Therefore, under the condition that the environment, the temperature and the treatment process are the same, the oil immersion speed of the insulating sample piece is higher under the normal pressure state than under the negative pressure state, and the time for completely immersing the insulating sample piece in the oil is shorter under the normal pressure state than under the negative pressure state.
In conclusion, simulation experiments and results show that the atmospheric pressure value in a high-altitude area is low, the oil immersion speed and quality of a solid insulating part in a transformer are influenced by a traditional static discharge method during production and manufacturing of the transformer, and the static discharge treatment of the transformer is completed by using the method provided by the invention, so that the problem can be solved, and the quality and the production period of the transformer are ensured.
Claims (4)
1. A static discharge process of a large oil-immersed transformer in a high-altitude area is characterized by comprising the following steps:
inquiring local altitude and atmospheric pressure value, comparing with standard atmospheric pressure value and calculating actual pressure value a;
secondly, the transformer completes assembly of all parts, vacuum oil injection and hot oil circulation according to a normal process flow, and a positive pressure gauge is arranged at the position of a valve at the top or the bottom of the transformer main body;
inquiring the maximum value b of the positive pressure bearing capacity of the project transformer main body according to the drawing and the related technical protocol;
connecting a temporary pipeline by using dry air or nitrogen, applying positive pressure to the interior of the transformer to a value a through an exhaust pipeline of the oil conservator, enabling the interior of the transformer to reach a standard atmospheric pressure value, and continuously increasing the pressure but not exceeding the maximum value b of the positive pressure which can be borne by the transformer main body;
determining the static discharge time according to the voltage grade of the transformer;
sixthly, observing the pressure gauge every 4h during the standing period, making a table to record time and pressure values, and supplementing in time if pressure drop exists;
seventhly, exhausting the transformer once every 24 hours during static discharge, wherein the exhaust standard is completed through the air discharge plugs at all positions, the air discharge plugs are screwed down after oil is discharged from the air discharge plugs, and tables are made to record exhaust time and exhaust conditions at all positions;
standing for a set time, discharging no gas from the gas discharge plugs at all positions of the transformer, and finishing standing.
2. The high-altitude area large oil-immersed transformer standing process according to claim 1, characterized in that: after the standing and releasing are finished, the pressure in the transformer is slowly relieved through an exhaust pipe of the oil conservator, and a pipeline and a pressure gauge are removed; the transformer has test conditions.
3. A static discharge effect verification method for a large oil-immersed transformer in a high-altitude area is characterized by comprising the following steps:
firstly, preparing; preparing two identical insulating sample pieces, namely a sample piece 1 and a sample piece 2, and drying and dehydrating the sample piece 1 and the sample piece 2 together;
(II) experimental process:
(1) respectively placing the sample piece 1 and the sample piece 2 into a No. 1 experimental device and a No. 2 experimental device, vacuumizing the two experimental devices and performing vacuum oil injection; the temperature of the oil is 50 ℃, the temperature of the oil after the oil is injected is 30 ℃, and the oil is naturally cooled to the room temperature;
(2) after the No. 1 test device is injected with oil, the interior is kept in a negative pressure state, the value of the pressure lower than atmospheric pressure is-0.03 MPa, and the experimental temperature is 21 ℃ of the ambient temperature;
(3) after the No. 2 test device is injected with oil, the interior is maintained to be in a normal pressure state, the standard atmospheric pressure value is achieved, and the test temperature is 21 ℃ of the environment temperature;
thirdly, analyzing and concluding data: according to test data, the oil immersion speed of the insulating sample piece in a negative pressure state is compared with that in a normal pressure state, and the oil immersion size difference is 3-5 mm every 24 hours; under the conditions that the temperature of the insulating sample piece is 21 ℃ and the negative pressure is-0.03 MPa, the complete oil immersion needs 4-5 days, and only 3 days under the normal pressure condition; therefore, under the condition that the environment, the temperature and the treatment process are the same, the oil immersion speed of the insulating sample piece is higher under the normal pressure state than under the negative pressure state, and the time for completely immersing the insulating sample piece in the oil is shorter under the normal pressure state than under the negative pressure state.
4. The static discharge effect verification method of the large oil-immersed transformer in the high-altitude area according to claim 3, characterized by comprising the following steps: the testing device is a closed container, the air pressure in the closed container is adjusted through a vacuum machine, and the testing device is provided with a pressure gauge for simulating the running environment of the transformer.
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| CN202111317455.2A CN114242450A (en) | 2021-11-09 | 2021-11-09 | Static discharge process and effect verification method for large oil-immersed transformer in high-altitude area |
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| CN202111317455.2A CN114242450A (en) | 2021-11-09 | 2021-11-09 | Static discharge process and effect verification method for large oil-immersed transformer in high-altitude area |
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| CN1059213A (en) * | 1990-08-21 | 1992-03-04 | 陕西省合阳电力电容器厂 | Compensation method to absolute pressure in the oil-content appliance housing |
| CN101577176A (en) * | 2009-03-18 | 2009-11-11 | 山东电力设备厂 | Process and equipment for oil impregantion of transformer body |
| CN202210646U (en) * | 2011-09-27 | 2012-05-02 | 成都振中电气有限公司 | 40.5 kV metal-armored withdrawable switching equipment applied to high altitude environment |
| CN103996985A (en) * | 2014-06-11 | 2014-08-20 | 云南电网公司昆明供电局 | Method for overhauling oil leakage existing on middle portion and lower portion of large transformer by means of pressure intensity balance |
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| CN207938452U (en) * | 2018-03-20 | 2018-10-02 | 山东泰开箱变有限公司 | A kind of low capacity all insulation station local coordinate frame |
| CN109281676A (en) * | 2018-10-31 | 2019-01-29 | 中铁工程装备集团有限公司 | A kind of shield machine or TBM optimization system suitable for high altitude low air pressure |
| CN109524198A (en) * | 2018-12-18 | 2019-03-26 | 中国能源建设集团安徽电力建设第二工程有限公司 | A kind of transformer installation method |
| CN109901028A (en) * | 2018-09-20 | 2019-06-18 | 中国电力科学研究院有限公司 | Paper oil insulation dielectric response measuring device with hot-oil circulation function |
| CN110060843A (en) * | 2019-04-24 | 2019-07-26 | 曾剑成 | It is a kind of can Quick air-discharge efficient oil-immersed type transformer |
| CN209280210U (en) * | 2018-09-30 | 2019-08-20 | 广西电网有限责任公司电力科学研究院 | A kind of power transformer capsule type oil storage cabinet leak detection auxiliary device |
| CN212327604U (en) * | 2020-05-06 | 2021-01-12 | 中石化南京工程有限公司 | Device for preventing negative pressure value appears in transformer oil strain evacuation |
| CN113484704A (en) * | 2021-06-30 | 2021-10-08 | 中国南方电网有限责任公司超高压输电公司 | Transformer test system and method for air pressure and temperature change conditions |
-
2021
- 2021-11-09 CN CN202111317455.2A patent/CN114242450A/en not_active Withdrawn
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059213A (en) * | 1990-08-21 | 1992-03-04 | 陕西省合阳电力电容器厂 | Compensation method to absolute pressure in the oil-content appliance housing |
| CN101577176A (en) * | 2009-03-18 | 2009-11-11 | 山东电力设备厂 | Process and equipment for oil impregantion of transformer body |
| CN202210646U (en) * | 2011-09-27 | 2012-05-02 | 成都振中电气有限公司 | 40.5 kV metal-armored withdrawable switching equipment applied to high altitude environment |
| CN103996985A (en) * | 2014-06-11 | 2014-08-20 | 云南电网公司昆明供电局 | Method for overhauling oil leakage existing on middle portion and lower portion of large transformer by means of pressure intensity balance |
| CN105609223A (en) * | 2016-01-21 | 2016-05-25 | 重庆大学 | Multifunctional vacuum impregnating equipment |
| CN106920668A (en) * | 2017-03-13 | 2017-07-04 | 安徽皖翔电力设备有限公司 | A kind of oil impregantion of transformer body technique |
| CN207097581U (en) * | 2017-06-22 | 2018-03-13 | 山东泰开变压器有限公司 | Oil-immersed power transformer for high altitude localities |
| CN207938452U (en) * | 2018-03-20 | 2018-10-02 | 山东泰开箱变有限公司 | A kind of low capacity all insulation station local coordinate frame |
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| CN109524198A (en) * | 2018-12-18 | 2019-03-26 | 中国能源建设集团安徽电力建设第二工程有限公司 | A kind of transformer installation method |
| CN110060843A (en) * | 2019-04-24 | 2019-07-26 | 曾剑成 | It is a kind of can Quick air-discharge efficient oil-immersed type transformer |
| CN212327604U (en) * | 2020-05-06 | 2021-01-12 | 中石化南京工程有限公司 | Device for preventing negative pressure value appears in transformer oil strain evacuation |
| CN113484704A (en) * | 2021-06-30 | 2021-10-08 | 中国南方电网有限责任公司超高压输电公司 | Transformer test system and method for air pressure and temperature change conditions |
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Application publication date: 20220325 |